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
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         u32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 197 {
 198         struct nfs4_client *clp = server->nfs4_state;
 199         spin_lock(&clp->cl_lock);
 200         if (time_before(clp->cl_last_renewal,timestamp))
 201                 clp->cl_last_renewal = timestamp;
 202         spin_unlock(&clp->cl_lock);
 203 }
 204
 205 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 206 {
 207         struct nfs_inode *nfsi = NFS_I(dir);
 208
 209         spin_lock(&dir->i_lock);
 210         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 211         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 212                 nfsi->change_attr = cinfo->after;
 213         spin_unlock(&dir->i_lock);
 214 }
 215
 216 struct nfs4_opendata {
 217         atomic_t count;
 218         struct nfs_openargs o_arg;
 219         struct nfs_openres o_res;
 220         struct nfs_open_confirmargs c_arg;
 221         struct nfs_open_confirmres c_res;
 222         struct nfs_fattr f_attr;
 223         struct nfs_fattr dir_attr;
 224         struct dentry *dentry;
 225         struct dentry *dir;
 226         struct nfs4_state_owner *owner;
 227         struct iattr attrs;
 228         unsigned long timestamp;
 229         int rpc_status;
 230         int cancelled;
 231 };
 232
 233 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 234                 struct nfs4_state_owner *sp, int flags,
 235                 const struct iattr *attrs)
 236 {
 237         struct dentry *parent = dget_parent(dentry);
 238         struct inode *dir = parent->d_inode;
 239         struct nfs_server *server = NFS_SERVER(dir);
 240         struct nfs4_opendata *p;
 241
 242         p = kzalloc(sizeof(*p), GFP_KERNEL);
 243         if (p == NULL)
 244                 goto err;
 245         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 246         if (p->o_arg.seqid == NULL)
 247                 goto err_free;
 248         atomic_set(&p->count, 1);
 249         p->dentry = dget(dentry);
 250         p->dir = parent;
 251         p->owner = sp;
 252         atomic_inc(&sp->so_count);
 253         p->o_arg.fh = NFS_FH(dir);
 254         p->o_arg.open_flags = flags,
 255         p->o_arg.clientid = server->nfs4_state->cl_clientid;
 256         p->o_arg.id = sp->so_id;
 257         p->o_arg.name = &dentry->d_name;
 258         p->o_arg.server = server;
 259         p->o_arg.bitmask = server->attr_bitmask;
 260         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 261         p->o_res.f_attr = &p->f_attr;
 262         p->o_res.dir_attr = &p->dir_attr;
 263         p->o_res.server = server;
 264         nfs_fattr_init(&p->f_attr);
 265         nfs_fattr_init(&p->dir_attr);
 266         if (flags & O_EXCL) {
 267                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 268                 s[0] = jiffies;
 269                 s[1] = current->pid;
 270         } else if (flags & O_CREAT) {
 271                 p->o_arg.u.attrs = &p->attrs;
 272                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 273         }
 274         p->c_arg.fh = &p->o_res.fh;
 275         p->c_arg.stateid = &p->o_res.stateid;
 276         p->c_arg.seqid = p->o_arg.seqid;
 277         return p;
 278 err_free:
 279         kfree(p);
 280 err:
 281         dput(parent);
 282         return NULL;
 283 }
 284
 285 static void nfs4_opendata_free(struct nfs4_opendata *p)
 286 {
 287         if (p != NULL && atomic_dec_and_test(&p->count)) {
 288                 nfs_free_seqid(p->o_arg.seqid);
 289                 nfs4_put_state_owner(p->owner);
 290                 dput(p->dir);
 291                 dput(p->dentry);
 292                 kfree(p);
 293         }
 294 }
 295
 296 /* Helper for asynchronous RPC calls */
 297 static int nfs4_call_async(struct rpc_clnt *clnt,
 298                 const struct rpc_call_ops *tk_ops, void *calldata)
 299 {
 300         struct rpc_task *task;
 301
 302         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 303                 return -ENOMEM;
 304         rpc_execute(task);
 305         return 0;
 306 }
 307
 308 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 309 {
 310         sigset_t oldset;
 311         int ret;
 312
 313         rpc_clnt_sigmask(task->tk_client, &oldset);
 314         ret = rpc_wait_for_completion_task(task);
 315         rpc_clnt_sigunmask(task->tk_client, &oldset);
 316         return ret;
 317 }
 318
 319 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 320 {
 321         switch (open_flags) {
 322                 case FMODE_WRITE:
 323                         state->n_wronly++;
 324                         break;
 325                 case FMODE_READ:
 326                         state->n_rdonly++;
 327                         break;
 328                 case FMODE_READ|FMODE_WRITE:
 329                         state->n_rdwr++;
 330         }
 331 }
 332
 333 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 334 {
 335         struct inode *inode = state->inode;
 336
 337         open_flags &= (FMODE_READ|FMODE_WRITE);
 338         /* Protect against nfs4_find_state_byowner() */
 339         spin_lock(&state->owner->so_lock);
 340         spin_lock(&inode->i_lock);
 341         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 342         update_open_stateflags(state, open_flags);
 343         nfs4_state_set_mode_locked(state, state->state | open_flags);
 344         spin_unlock(&inode->i_lock);
 345         spin_unlock(&state->owner->so_lock);
 346 }
 347
 348 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 349 {
 350         struct inode *inode;
 351         struct nfs4_state *state = NULL;
 352
 353         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 354                 goto out;
 355         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 356         if (IS_ERR(inode))
 357                 goto out;
 358         state = nfs4_get_open_state(inode, data->owner);
 359         if (state == NULL)
 360                 goto put_inode;
 361         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 362 put_inode:
 363         iput(inode);
 364 out:
 365         return state;
 366 }
 367
 368 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 369 {
 370         struct nfs_inode *nfsi = NFS_I(state->inode);
 371         struct nfs_open_context *ctx;
 372
 373         spin_lock(&state->inode->i_lock);
 374         list_for_each_entry(ctx, &nfsi->open_files, list) {
 375                 if (ctx->state != state)
 376                         continue;
 377                 get_nfs_open_context(ctx);
 378                 spin_unlock(&state->inode->i_lock);
 379                 return ctx;
 380         }
 381         spin_unlock(&state->inode->i_lock);
 382         return ERR_PTR(-ENOENT);
 383 }
 384
 385 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 386 {
 387         int ret;
 388
 389         opendata->o_arg.open_flags = openflags;
 390         ret = _nfs4_proc_open(opendata);
 391         if (ret != 0)
 392                 return ret;
 393         memcpy(stateid->data, opendata->o_res.stateid.data,
 394                         sizeof(stateid->data));
 395         return 0;
 396 }
 397
 398 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 399 {
 400         nfs4_stateid stateid;
 401         struct nfs4_state *newstate;
 402         int mode = 0;
 403         int delegation = 0;
 404         int ret;
 405
 406         /* memory barrier prior to reading state->n_* */
 407         smp_rmb();
 408         if (state->n_rdwr != 0) {
 409                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 410                 if (ret != 0)
 411                         return ret;
 412                 mode |= FMODE_READ|FMODE_WRITE;
 413                 if (opendata->o_res.delegation_type != 0)
 414                         delegation = opendata->o_res.delegation_type;
 415                 smp_rmb();
 416         }
 417         if (state->n_wronly != 0) {
 418                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 419                 if (ret != 0)
 420                         return ret;
 421                 mode |= FMODE_WRITE;
 422                 if (opendata->o_res.delegation_type != 0)
 423                         delegation = opendata->o_res.delegation_type;
 424                 smp_rmb();
 425         }
 426         if (state->n_rdonly != 0) {
 427                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 428                 if (ret != 0)
 429                         return ret;
 430                 mode |= FMODE_READ;
 431         }
 432         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 433         if (mode == 0)
 434                 return 0;
 435         if (opendata->o_res.delegation_type == 0)
 436                 opendata->o_res.delegation_type = delegation;
 437         opendata->o_arg.open_flags |= mode;
 438         newstate = nfs4_opendata_to_nfs4_state(opendata);
 439         if (newstate != NULL) {
 440                 if (opendata->o_res.delegation_type != 0) {
 441                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 442                         int delegation_flags = 0;
 443                         if (nfsi->delegation)
 444                                 delegation_flags = nfsi->delegation->flags;
 445                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 446                                 nfs_inode_set_delegation(newstate->inode,
 447                                                 opendata->owner->so_cred,
 448                                                 &opendata->o_res);
 449                         else
 450                                 nfs_inode_reclaim_delegation(newstate->inode,
 451                                                 opendata->owner->so_cred,
 452                                                 &opendata->o_res);
 453                 }
 454                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 455         }
 456         if (newstate != state)
 457                 return -ESTALE;
 458         return 0;
 459 }
 460
 461 /*
 462  * OPEN_RECLAIM:
 463  *      reclaim state on the server after a reboot.
 464  */
 465 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 466 {
 467         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 468         struct nfs4_opendata *opendata;
 469         int delegation_type = 0;
 470         int status;
 471
 472         if (delegation != NULL) {
 473                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 474                         memcpy(&state->stateid, &delegation->stateid,
 475                                         sizeof(state->stateid));
 476                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 477                         return 0;
 478                 }
 479                 delegation_type = delegation->type;
 480         }
 481         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 482         if (opendata == NULL)
 483                 return -ENOMEM;
 484         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 485         opendata->o_arg.fh = NFS_FH(state->inode);
 486         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 487         opendata->o_arg.u.delegation_type = delegation_type;
 488         status = nfs4_open_recover(opendata, state);
 489         nfs4_opendata_free(opendata);
 490         return status;
 491 }
 492
 493 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 494 {
 495         struct nfs_server *server = NFS_SERVER(state->inode);
 496         struct nfs4_exception exception = { };
 497         int err;
 498         do {
 499                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 500                 if (err != -NFS4ERR_DELAY)
 501                         break;
 502                 nfs4_handle_exception(server, err, &exception);
 503         } while (exception.retry);
 504         return err;
 505 }
 506
 507 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 508 {
 509         struct nfs_open_context *ctx;
 510         int ret;
 511
 512         ctx = nfs4_state_find_open_context(state);
 513         if (IS_ERR(ctx))
 514                 return PTR_ERR(ctx);
 515         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 516         put_nfs_open_context(ctx);
 517         return ret;
 518 }
 519
 520 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 521 {
 522         struct nfs4_state_owner  *sp  = state->owner;
 523         struct nfs4_opendata *opendata;
 524         int ret;
 525
 526         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 527                 return 0;
 528         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 529         if (opendata == NULL)
 530                 return -ENOMEM;
 531         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 532         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 533                         sizeof(opendata->o_arg.u.delegation.data));
 534         ret = nfs4_open_recover(opendata, state);
 535         nfs4_opendata_free(opendata);
 536         return ret;
 537 }
 538
 539 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 540 {
 541         struct nfs4_exception exception = { };
 542         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 543         int err;
 544         do {
 545                 err = _nfs4_open_delegation_recall(dentry, state);
 546                 switch (err) {
 547                         case 0:
 548                                 return err;
 549                         case -NFS4ERR_STALE_CLIENTID:
 550                         case -NFS4ERR_STALE_STATEID:
 551                         case -NFS4ERR_EXPIRED:
 552                                 /* Don't recall a delegation if it was lost */
 553                                 nfs4_schedule_state_recovery(server->nfs4_state);
 554                                 return err;
 555                 }
 556                 err = nfs4_handle_exception(server, err, &exception);
 557         } while (exception.retry);
 558         return err;
 559 }
 560
 561 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 562 {
 563         struct nfs4_opendata *data = calldata;
 564         struct  rpc_message msg = {
 565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 566                 .rpc_argp = &data->c_arg,
 567                 .rpc_resp = &data->c_res,
 568                 .rpc_cred = data->owner->so_cred,
 569         };
 570         data->timestamp = jiffies;
 571         rpc_call_setup(task, &msg, 0);
 572 }
 573
 574 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 575 {
 576         struct nfs4_opendata *data = calldata;
 577
 578         data->rpc_status = task->tk_status;
 579         if (RPC_ASSASSINATED(task))
 580                 return;
 581         if (data->rpc_status == 0) {
 582                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 583                                 sizeof(data->o_res.stateid.data));
 584                 renew_lease(data->o_res.server, data->timestamp);
 585         }
 586         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 587         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 588 }
 589
 590 static void nfs4_open_confirm_release(void *calldata)
 591 {
 592         struct nfs4_opendata *data = calldata;
 593         struct nfs4_state *state = NULL;
 594
 595         /* If this request hasn't been cancelled, do nothing */
 596         if (data->cancelled == 0)
 597                 goto out_free;
 598         /* In case of error, no cleanup! */
 599         if (data->rpc_status != 0)
 600                 goto out_free;
 601         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 602         state = nfs4_opendata_to_nfs4_state(data);
 603         if (state != NULL)
 604                 nfs4_close_state(state, data->o_arg.open_flags);
 605 out_free:
 606         nfs4_opendata_free(data);
 607 }
 608
 609 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 610         .rpc_call_prepare = nfs4_open_confirm_prepare,
 611         .rpc_call_done = nfs4_open_confirm_done,
 612         .rpc_release = nfs4_open_confirm_release,
 613 };
 614
 615 /*
 616  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 617  */
 618 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 619 {
 620         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 621         struct rpc_task *task;
 622         int status;
 623
 624         atomic_inc(&data->count);
 625         /*
 626          * If rpc_run_task() ends up calling ->rpc_release(), we
 627          * want to ensure that it takes the 'error' code path.
 628          */
 629         data->rpc_status = -ENOMEM;
 630         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 631         if (IS_ERR(task))
 632                 return PTR_ERR(task);
 633         status = nfs4_wait_for_completion_rpc_task(task);
 634         if (status != 0) {
 635                 data->cancelled = 1;
 636                 smp_wmb();
 637         } else
 638                 status = data->rpc_status;
 639         rpc_release_task(task);
 640         return status;
 641 }
 642
 643 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 644 {
 645         struct nfs4_opendata *data = calldata;
 646         struct nfs4_state_owner *sp = data->owner;
 647         struct rpc_message msg = {
 648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 649                 .rpc_argp = &data->o_arg,
 650                 .rpc_resp = &data->o_res,
 651                 .rpc_cred = sp->so_cred,
 652         };
 653
 654         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 655                 return;
 656         /* Update sequence id. */
 657         data->o_arg.id = sp->so_id;
 658         data->o_arg.clientid = sp->so_client->cl_clientid;
 659         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 660                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 661         data->timestamp = jiffies;
 662         rpc_call_setup(task, &msg, 0);
 663 }
 664
 665 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 666 {
 667         struct nfs4_opendata *data = calldata;
 668
 669         data->rpc_status = task->tk_status;
 670         if (RPC_ASSASSINATED(task))
 671                 return;
 672         if (task->tk_status == 0) {
 673                 switch (data->o_res.f_attr->mode & S_IFMT) {
 674                         case S_IFREG:
 675                                 break;
 676                         case S_IFLNK:
 677                                 data->rpc_status = -ELOOP;
 678                                 break;
 679                         case S_IFDIR:
 680                                 data->rpc_status = -EISDIR;
 681                                 break;
 682                         default:
 683                                 data->rpc_status = -ENOTDIR;
 684                 }
 685                 renew_lease(data->o_res.server, data->timestamp);
 686         }
 687         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 688 }
 689
 690 static void nfs4_open_release(void *calldata)
 691 {
 692         struct nfs4_opendata *data = calldata;
 693         struct nfs4_state *state = NULL;
 694
 695         /* If this request hasn't been cancelled, do nothing */
 696         if (data->cancelled == 0)
 697                 goto out_free;
 698         /* In case of error, no cleanup! */
 699         if (data->rpc_status != 0)
 700                 goto out_free;
 701         /* In case we need an open_confirm, no cleanup! */
 702         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 703                 goto out_free;
 704         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 705         state = nfs4_opendata_to_nfs4_state(data);
 706         if (state != NULL)
 707                 nfs4_close_state(state, data->o_arg.open_flags);
 708 out_free:
 709         nfs4_opendata_free(data);
 710 }
 711
 712 static const struct rpc_call_ops nfs4_open_ops = {
 713         .rpc_call_prepare = nfs4_open_prepare,
 714         .rpc_call_done = nfs4_open_done,
 715         .rpc_release = nfs4_open_release,
 716 };
 717
 718 /*
 719  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 720  */
 721 static int _nfs4_proc_open(struct nfs4_opendata *data)
 722 {
 723         struct inode *dir = data->dir->d_inode;
 724         struct nfs_server *server = NFS_SERVER(dir);
 725         struct nfs_openargs *o_arg = &data->o_arg;
 726         struct nfs_openres *o_res = &data->o_res;
 727         struct rpc_task *task;
 728         int status;
 729
 730         atomic_inc(&data->count);
 731         /*
 732          * If rpc_run_task() ends up calling ->rpc_release(), we
 733          * want to ensure that it takes the 'error' code path.
 734          */
 735         data->rpc_status = -ENOMEM;
 736         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 737         if (IS_ERR(task))
 738                 return PTR_ERR(task);
 739         status = nfs4_wait_for_completion_rpc_task(task);
 740         if (status != 0) {
 741                 data->cancelled = 1;
 742                 smp_wmb();
 743         } else
 744                 status = data->rpc_status;
 745         rpc_release_task(task);
 746         if (status != 0)
 747                 return status;
 748
 749         if (o_arg->open_flags & O_CREAT) {
 750                 update_changeattr(dir, &o_res->cinfo);
 751                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 752         } else
 753                 nfs_refresh_inode(dir, o_res->dir_attr);
 754         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 755                 status = _nfs4_proc_open_confirm(data);
 756                 if (status != 0)
 757                         return status;
 758         }
 759         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 760         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 761                 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 762         return 0;
 763 }
 764
 765 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 766 {
 767         struct nfs_access_entry cache;
 768         int mask = 0;
 769         int status;
 770
 771         if (openflags & FMODE_READ)
 772                 mask |= MAY_READ;
 773         if (openflags & FMODE_WRITE)
 774                 mask |= MAY_WRITE;
 775         status = nfs_access_get_cached(inode, cred, &cache);
 776         if (status == 0)
 777                 goto out;
 778
 779         /* Be clever: ask server to check for all possible rights */
 780         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 781         cache.cred = cred;
 782         cache.jiffies = jiffies;
 783         status = _nfs4_proc_access(inode, &cache);
 784         if (status != 0)
 785                 return status;
 786         nfs_access_add_cache(inode, &cache);
 787 out:
 788         if ((cache.mask & mask) == mask)
 789                 return 0;
 790         return -EACCES;
 791 }
 792
 793 int nfs4_recover_expired_lease(struct nfs_server *server)
 794 {
 795         struct nfs4_client *clp = server->nfs4_state;
 796
 797         if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 798                 nfs4_schedule_state_recovery(clp);
 799         return nfs4_wait_clnt_recover(server->client, clp);
 800 }
 801
 802 /*
 803  * OPEN_EXPIRED:
 804  *      reclaim state on the server after a network partition.
 805  *      Assumes caller holds the appropriate lock
 806  */
 807 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 808 {
 809         struct inode *inode = state->inode;
 810         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 811         struct nfs4_opendata *opendata;
 812         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 813         int ret;
 814
 815         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 816                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 817                 if (ret < 0)
 818                         return ret;
 819                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 820                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 821                 return 0;
 822         }
 823         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 824         if (opendata == NULL)
 825                 return -ENOMEM;
 826         ret = nfs4_open_recover(opendata, state);
 827         if (ret == -ESTALE) {
 828                 /* Invalidate the state owner so we don't ever use it again */
 829                 nfs4_drop_state_owner(sp);
 830                 d_drop(dentry);
 831         }
 832         nfs4_opendata_free(opendata);
 833         return ret;
 834 }
 835
 836 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 837 {
 838         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 839         struct nfs4_exception exception = { };
 840         int err;
 841
 842         do {
 843                 err = _nfs4_open_expired(sp, state, dentry);
 844                 if (err == -NFS4ERR_DELAY)
 845                         nfs4_handle_exception(server, err, &exception);
 846         } while (exception.retry);
 847         return err;
 848 }
 849
 850 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 851 {
 852         struct nfs_open_context *ctx;
 853         int ret;
 854
 855         ctx = nfs4_state_find_open_context(state);
 856         if (IS_ERR(ctx))
 857                 return PTR_ERR(ctx);
 858         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 859         put_nfs_open_context(ctx);
 860         return ret;
 861 }
 862
 863 /*
 864  * Returns a referenced nfs4_state if there is an open delegation on the file
 865  */
 866 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 867 {
 868         struct nfs_delegation *delegation;
 869         struct nfs_server *server = NFS_SERVER(inode);
 870         struct nfs4_client *clp = server->nfs4_state;
 871         struct nfs_inode *nfsi = NFS_I(inode);
 872         struct nfs4_state_owner *sp = NULL;
 873         struct nfs4_state *state = NULL;
 874         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 875         int err;
 876
 877         err = -ENOMEM;
 878         if (!(sp = nfs4_get_state_owner(server, cred))) {
 879                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 880                 return err;
 881         }
 882         err = nfs4_recover_expired_lease(server);
 883         if (err != 0)
 884                 goto out_put_state_owner;
 885         /* Protect against reboot recovery - NOTE ORDER! */
 886         down_read(&clp->cl_sem);
 887         /* Protect against delegation recall */
 888         down_read(&nfsi->rwsem);
 889         delegation = NFS_I(inode)->delegation;
 890         err = -ENOENT;
 891         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 892                 goto out_err;
 893         err = -ENOMEM;
 894         state = nfs4_get_open_state(inode, sp);
 895         if (state == NULL)
 896                 goto out_err;
 897
 898         err = -ENOENT;
 899         if ((state->state & open_flags) == open_flags) {
 900                 spin_lock(&inode->i_lock);
 901                 update_open_stateflags(state, open_flags);
 902                 spin_unlock(&inode->i_lock);
 903                 goto out_ok;
 904         } else if (state->state != 0)
 905                 goto out_put_open_state;
 906
 907         lock_kernel();
 908         err = _nfs4_do_access(inode, cred, open_flags);
 909         unlock_kernel();
 910         if (err != 0)
 911                 goto out_put_open_state;
 912         set_bit(NFS_DELEGATED_STATE, &state->flags);
 913         update_open_stateid(state, &delegation->stateid, open_flags);
 914 out_ok:
 915         nfs4_put_state_owner(sp);
 916         up_read(&nfsi->rwsem);
 917         up_read(&clp->cl_sem);
 918         *res = state;
 919         return 0;
 920 out_put_open_state:
 921         nfs4_put_open_state(state);
 922 out_err:
 923         up_read(&nfsi->rwsem);
 924         up_read(&clp->cl_sem);
 925         if (err != -EACCES)
 926                 nfs_inode_return_delegation(inode);
 927 out_put_state_owner:
 928         nfs4_put_state_owner(sp);
 929         return err;
 930 }
 931
 932 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 933 {
 934         struct nfs4_exception exception = { };
 935         struct nfs4_state *res = ERR_PTR(-EIO);
 936         int err;
 937
 938         do {
 939                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 940                 if (err == 0)
 941                         break;
 942                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 943                                         err, &exception));
 944         } while (exception.retry);
 945         return res;
 946 }
 947
 948 /*
 949  * Returns a referenced nfs4_state
 950  */
 951 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 952 {
 953         struct nfs4_state_owner  *sp;
 954         struct nfs4_state     *state = NULL;
 955         struct nfs_server       *server = NFS_SERVER(dir);
 956         struct nfs4_client *clp = server->nfs4_state;
 957         struct nfs4_opendata *opendata;
 958         int                     status;
 959
 960         /* Protect against reboot recovery conflicts */
 961         status = -ENOMEM;
 962         if (!(sp = nfs4_get_state_owner(server, cred))) {
 963                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 964                 goto out_err;
 965         }
 966         status = nfs4_recover_expired_lease(server);
 967         if (status != 0)
 968                 goto err_put_state_owner;
 969         down_read(&clp->cl_sem);
 970         status = -ENOMEM;
 971         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 972         if (opendata == NULL)
 973                 goto err_put_state_owner;
 974
 975         status = _nfs4_proc_open(opendata);
 976         if (status != 0)
 977                 goto err_opendata_free;
 978
 979         status = -ENOMEM;
 980         state = nfs4_opendata_to_nfs4_state(opendata);
 981         if (state == NULL)
 982                 goto err_opendata_free;
 983         if (opendata->o_res.delegation_type != 0)
 984                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 985         nfs4_opendata_free(opendata);
 986         nfs4_put_state_owner(sp);
 987         up_read(&clp->cl_sem);
 988         *res = state;
 989         return 0;
 990 err_opendata_free:
 991         nfs4_opendata_free(opendata);
 992 err_put_state_owner:
 993         nfs4_put_state_owner(sp);
 994 out_err:
 995         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 996         up_read(&clp->cl_sem);
 997         *res = NULL;
 998         return status;
 999 }
1000
1001
1002 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1003 {
1004         struct nfs4_exception exception = { };
1005         struct nfs4_state *res;
1006         int status;
1007
1008         do {
1009                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1010                 if (status == 0)
1011                         break;
1012                 /* NOTE: BAD_SEQID means the server and client disagree about the
1013                  * book-keeping w.r.t. state-changing operations
1014                  * (OPEN/CLOSE/LOCK/LOCKU...)
1015                  * It is actually a sign of a bug on the client or on the server.
1016                  *
1017                  * If we receive a BAD_SEQID error in the particular case of
1018                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1019                  * have unhashed the old state_owner for us, and that we can
1020                  * therefore safely retry using a new one. We should still warn
1021                  * the user though...
1022                  */
1023                 if (status == -NFS4ERR_BAD_SEQID) {
1024                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1025                         exception.retry = 1;
1026                         continue;
1027                 }
1028                 /*
1029                  * BAD_STATEID on OPEN means that the server cancelled our
1030                  * state before it received the OPEN_CONFIRM.
1031                  * Recover by retrying the request as per the discussion
1032                  * on Page 181 of RFC3530.
1033                  */
1034                 if (status == -NFS4ERR_BAD_STATEID) {
1035                         exception.retry = 1;
1036                         continue;
1037                 }
1038                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1039                                         status, &exception));
1040         } while (exception.retry);
1041         return res;
1042 }
1043
1044 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1045                 struct iattr *sattr, struct nfs4_state *state)
1046 {
1047         struct nfs_server *server = NFS_SERVER(inode);
1048         struct nfs_setattrargs  arg = {
1049                 .fh             = NFS_FH(inode),
1050                 .iap            = sattr,
1051                 .server         = server,
1052                 .bitmask = server->attr_bitmask,
1053         };
1054         struct nfs_setattrres  res = {
1055                 .fattr          = fattr,
1056                 .server         = server,
1057         };
1058         struct rpc_message msg = {
1059                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1060                 .rpc_argp       = &arg,
1061                 .rpc_resp       = &res,
1062         };
1063         unsigned long timestamp = jiffies;
1064         int status;
1065
1066         nfs_fattr_init(fattr);
1067
1068         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1069                 /* Use that stateid */
1070         } else if (state != NULL) {
1071                 msg.rpc_cred = state->owner->so_cred;
1072                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1073         } else
1074                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1075
1076         status = rpc_call_sync(server->client, &msg, 0);
1077         if (status == 0 && state != NULL)
1078                 renew_lease(server, timestamp);
1079         return status;
1080 }
1081
1082 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1083                 struct iattr *sattr, struct nfs4_state *state)
1084 {
1085         struct nfs_server *server = NFS_SERVER(inode);
1086         struct nfs4_exception exception = { };
1087         int err;
1088         do {
1089                 err = nfs4_handle_exception(server,
1090                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1091                                 &exception);
1092         } while (exception.retry);
1093         return err;
1094 }
1095
1096 struct nfs4_closedata {
1097         struct inode *inode;
1098         struct nfs4_state *state;
1099         struct nfs_closeargs arg;
1100         struct nfs_closeres res;
1101         struct nfs_fattr fattr;
1102         unsigned long timestamp;
1103 };
1104
1105 static void nfs4_free_closedata(void *data)
1106 {
1107         struct nfs4_closedata *calldata = data;
1108         struct nfs4_state_owner *sp = calldata->state->owner;
1109
1110         nfs4_put_open_state(calldata->state);
1111         nfs_free_seqid(calldata->arg.seqid);
1112         nfs4_put_state_owner(sp);
1113         kfree(calldata);
1114 }
1115
1116 static void nfs4_close_done(struct rpc_task *task, void *data)
1117 {
1118         struct nfs4_closedata *calldata = data;
1119         struct nfs4_state *state = calldata->state;
1120         struct nfs_server *server = NFS_SERVER(calldata->inode);
1121
1122         if (RPC_ASSASSINATED(task))
1123                 return;
1124         /* hmm. we are done with the inode, and in the process of freeing
1125          * the state_owner. we keep this around to process errors
1126          */
1127         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1128         switch (task->tk_status) {
1129                 case 0:
1130                         memcpy(&state->stateid, &calldata->res.stateid,
1131                                         sizeof(state->stateid));
1132                         renew_lease(server, calldata->timestamp);
1133                         break;
1134                 case -NFS4ERR_STALE_STATEID:
1135                 case -NFS4ERR_EXPIRED:
1136                         nfs4_schedule_state_recovery(server->nfs4_state);
1137                         break;
1138                 default:
1139                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1140                                 rpc_restart_call(task);
1141                                 return;
1142                         }
1143         }
1144         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1145 }
1146
1147 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1148 {
1149         struct nfs4_closedata *calldata = data;
1150         struct nfs4_state *state = calldata->state;
1151         struct rpc_message msg = {
1152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1153                 .rpc_argp = &calldata->arg,
1154                 .rpc_resp = &calldata->res,
1155                 .rpc_cred = state->owner->so_cred,
1156         };
1157         int mode = 0, old_mode;
1158
1159         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1160                 return;
1161         /* Recalculate the new open mode in case someone reopened the file
1162          * while we were waiting in line to be scheduled.
1163          */
1164         spin_lock(&state->owner->so_lock);
1165         spin_lock(&calldata->inode->i_lock);
1166         mode = old_mode = state->state;
1167         if (state->n_rdwr == 0) {
1168                 if (state->n_rdonly == 0)
1169                         mode &= ~FMODE_READ;
1170                 if (state->n_wronly == 0)
1171                         mode &= ~FMODE_WRITE;
1172         }
1173         nfs4_state_set_mode_locked(state, mode);
1174         spin_unlock(&calldata->inode->i_lock);
1175         spin_unlock(&state->owner->so_lock);
1176         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1177                 /* Note: exit _without_ calling nfs4_close_done */
1178                 task->tk_action = NULL;
1179                 return;
1180         }
1181         nfs_fattr_init(calldata->res.fattr);
1182         if (mode != 0)
1183                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1184         calldata->arg.open_flags = mode;
1185         calldata->timestamp = jiffies;
1186         rpc_call_setup(task, &msg, 0);
1187 }
1188
1189 static const struct rpc_call_ops nfs4_close_ops = {
1190         .rpc_call_prepare = nfs4_close_prepare,
1191         .rpc_call_done = nfs4_close_done,
1192         .rpc_release = nfs4_free_closedata,
1193 };
1194
1195 /*
1196  * It is possible for data to be read/written from a mem-mapped file
1197  * after the sys_close call (which hits the vfs layer as a flush).
1198  * This means that we can't safely call nfsv4 close on a file until
1199  * the inode is cleared. This in turn means that we are not good
1200  * NFSv4 citizens - we do not indicate to the server to update the file's
1201  * share state even when we are done with one of the three share
1202  * stateid's in the inode.
1203  *
1204  * NOTE: Caller must be holding the sp->so_owner semaphore!
1205  */
1206 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1207 {
1208         struct nfs_server *server = NFS_SERVER(inode);
1209         struct nfs4_closedata *calldata;
1210         int status = -ENOMEM;
1211
1212         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1213         if (calldata == NULL)
1214                 goto out;
1215         calldata->inode = inode;
1216         calldata->state = state;
1217         calldata->arg.fh = NFS_FH(inode);
1218         calldata->arg.stateid = &state->stateid;
1219         /* Serialization for the sequence id */
1220         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1221         if (calldata->arg.seqid == NULL)
1222                 goto out_free_calldata;
1223         calldata->arg.bitmask = server->attr_bitmask;
1224         calldata->res.fattr = &calldata->fattr;
1225         calldata->res.server = server;
1226
1227         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1228         if (status == 0)
1229                 goto out;
1230
1231         nfs_free_seqid(calldata->arg.seqid);
1232 out_free_calldata:
1233         kfree(calldata);
1234 out:
1235         return status;
1236 }
1237
1238 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1239 {
1240         struct file *filp;
1241
1242         filp = lookup_instantiate_filp(nd, dentry, NULL);
1243         if (!IS_ERR(filp)) {
1244                 struct nfs_open_context *ctx;
1245                 ctx = (struct nfs_open_context *)filp->private_data;
1246                 ctx->state = state;
1247                 return 0;
1248         }
1249         nfs4_close_state(state, nd->intent.open.flags);
1250         return PTR_ERR(filp);
1251 }
1252
1253 struct dentry *
1254 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1255 {
1256         struct iattr attr;
1257         struct rpc_cred *cred;
1258         struct nfs4_state *state;
1259         struct dentry *res;
1260
1261         if (nd->flags & LOOKUP_CREATE) {
1262                 attr.ia_mode = nd->intent.open.create_mode;
1263                 attr.ia_valid = ATTR_MODE;
1264                 if (!IS_POSIXACL(dir))
1265                         attr.ia_mode &= ~current->fs->umask;
1266         } else {
1267                 attr.ia_valid = 0;
1268                 BUG_ON(nd->intent.open.flags & O_CREAT);
1269         }
1270
1271         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1272         if (IS_ERR(cred))
1273                 return (struct dentry *)cred;
1274         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1275         put_rpccred(cred);
1276         if (IS_ERR(state)) {
1277                 if (PTR_ERR(state) == -ENOENT)
1278                         d_add(dentry, NULL);
1279                 return (struct dentry *)state;
1280         }
1281         res = d_add_unique(dentry, igrab(state->inode));
1282         if (res != NULL)
1283                 dentry = res;
1284         nfs4_intent_set_file(nd, dentry, state);
1285         return res;
1286 }
1287
1288 int
1289 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1290 {
1291         struct rpc_cred *cred;
1292         struct nfs4_state *state;
1293
1294         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1295         if (IS_ERR(cred))
1296                 return PTR_ERR(cred);
1297         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1298         if (IS_ERR(state))
1299                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1300         put_rpccred(cred);
1301         if (IS_ERR(state)) {
1302                 switch (PTR_ERR(state)) {
1303                         case -EPERM:
1304                         case -EACCES:
1305                         case -EDQUOT:
1306                         case -ENOSPC:
1307                         case -EROFS:
1308                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1309                                 return 1;
1310                         case -ENOENT:
1311                                 if (dentry->d_inode == NULL)
1312                                         return 1;
1313                 }
1314                 goto out_drop;
1315         }
1316         if (state->inode == dentry->d_inode) {
1317                 nfs4_intent_set_file(nd, dentry, state);
1318                 return 1;
1319         }
1320         nfs4_close_state(state, openflags);
1321 out_drop:
1322         d_drop(dentry);
1323         return 0;
1324 }
1325
1326
1327 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1328 {
1329         struct nfs4_server_caps_res res = {};
1330         struct rpc_message msg = {
1331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1332                 .rpc_argp = fhandle,
1333                 .rpc_resp = &res,
1334         };
1335         int status;
1336
1337         status = rpc_call_sync(server->client, &msg, 0);
1338         if (status == 0) {
1339                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1340                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1341                         server->caps |= NFS_CAP_ACLS;
1342                 if (res.has_links != 0)
1343                         server->caps |= NFS_CAP_HARDLINKS;
1344                 if (res.has_symlinks != 0)
1345                         server->caps |= NFS_CAP_SYMLINKS;
1346                 server->acl_bitmask = res.acl_bitmask;
1347         }
1348         return status;
1349 }
1350
1351 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1352 {
1353         struct nfs4_exception exception = { };
1354         int err;
1355         do {
1356                 err = nfs4_handle_exception(server,
1357                                 _nfs4_server_capabilities(server, fhandle),
1358                                 &exception);
1359         } while (exception.retry);
1360         return err;
1361 }
1362
1363 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1364                 struct nfs_fsinfo *info)
1365 {
1366         struct nfs4_lookup_root_arg args = {
1367                 .bitmask = nfs4_fattr_bitmap,
1368         };
1369         struct nfs4_lookup_res res = {
1370                 .server = server,
1371                 .fattr = info->fattr,
1372                 .fh = fhandle,
1373         };
1374         struct rpc_message msg = {
1375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1376                 .rpc_argp = &args,
1377                 .rpc_resp = &res,
1378         };
1379         nfs_fattr_init(info->fattr);
1380         return rpc_call_sync(server->client, &msg, 0);
1381 }
1382
1383 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1384                 struct nfs_fsinfo *info)
1385 {
1386         struct nfs4_exception exception = { };
1387         int err;
1388         do {
1389                 err = nfs4_handle_exception(server,
1390                                 _nfs4_lookup_root(server, fhandle, info),
1391                                 &exception);
1392         } while (exception.retry);
1393         return err;
1394 }
1395
1396 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1397                 struct nfs_fsinfo *info)
1398 {
1399         struct nfs_fattr *      fattr = info->fattr;
1400         unsigned char *         p;
1401         struct qstr             q;
1402         struct nfs4_lookup_arg args = {
1403                 .dir_fh = fhandle,
1404                 .name = &q,
1405                 .bitmask = nfs4_fattr_bitmap,
1406         };
1407         struct nfs4_lookup_res res = {
1408                 .server = server,
1409                 .fattr = fattr,
1410                 .fh = fhandle,
1411         };
1412         struct rpc_message msg = {
1413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1414                 .rpc_argp = &args,
1415                 .rpc_resp = &res,
1416         };
1417         int status;
1418
1419         /*
1420          * Now we do a separate LOOKUP for each component of the mount path.
1421          * The LOOKUPs are done separately so that we can conveniently
1422          * catch an ERR_WRONGSEC if it occurs along the way...
1423          */
1424         status = nfs4_lookup_root(server, fhandle, info);
1425         if (status)
1426                 goto out;
1427
1428         p = server->mnt_path;
1429         for (;;) {
1430                 struct nfs4_exception exception = { };
1431
1432                 while (*p == '/')
1433                         p++;
1434                 if (!*p)
1435                         break;
1436                 q.name = p;
1437                 while (*p && (*p != '/'))
1438                         p++;
1439                 q.len = p - q.name;
1440
1441                 do {
1442                         nfs_fattr_init(fattr);
1443                         status = nfs4_handle_exception(server,
1444                                         rpc_call_sync(server->client, &msg, 0),
1445                                         &exception);
1446                 } while (exception.retry);
1447                 if (status == 0)
1448                         continue;
1449                 if (status == -ENOENT) {
1450                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1451                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1452                 }
1453                 break;
1454         }
1455         if (status == 0)
1456                 status = nfs4_server_capabilities(server, fhandle);
1457         if (status == 0)
1458                 status = nfs4_do_fsinfo(server, fhandle, info);
1459 out:
1460         return nfs4_map_errors(status);
1461 }
1462
1463 /*
1464  * Get locations and (maybe) other attributes of a referral.
1465  * Note that we'll actually follow the referral later when
1466  * we detect fsid mismatch in inode revalidation
1467  */
1468 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1469 {
1470         int status = -ENOMEM;
1471         struct page *page = NULL;
1472         struct nfs4_fs_locations *locations = NULL;
1473         struct dentry dentry = {};
1474
1475         page = alloc_page(GFP_KERNEL);
1476         if (page == NULL)
1477                 goto out;
1478         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1479         if (locations == NULL)
1480                 goto out;
1481
1482         dentry.d_name.name = name->name;
1483         dentry.d_name.len = name->len;
1484         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1485         if (status != 0)
1486                 goto out;
1487         /* Make sure server returned a different fsid for the referral */
1488         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1489                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1490                 status = -EIO;
1491                 goto out;
1492         }
1493
1494         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1495         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1496         if (!fattr->mode)
1497                 fattr->mode = S_IFDIR;
1498         memset(fhandle, 0, sizeof(struct nfs_fh));
1499 out:
1500         if (page)
1501                 __free_page(page);
1502         if (locations)
1503                 kfree(locations);
1504         return status;
1505 }
1506
1507 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1508 {
1509         struct nfs4_getattr_arg args = {
1510                 .fh = fhandle,
1511                 .bitmask = server->attr_bitmask,
1512         };
1513         struct nfs4_getattr_res res = {
1514                 .fattr = fattr,
1515                 .server = server,
1516         };
1517         struct rpc_message msg = {
1518                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1519                 .rpc_argp = &args,
1520                 .rpc_resp = &res,
1521         };
1522
1523         nfs_fattr_init(fattr);
1524         return rpc_call_sync(server->client, &msg, 0);
1525 }
1526
1527 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1528 {
1529         struct nfs4_exception exception = { };
1530         int err;
1531         do {
1532                 err = nfs4_handle_exception(server,
1533                                 _nfs4_proc_getattr(server, fhandle, fattr),
1534                                 &exception);
1535         } while (exception.retry);
1536         return err;
1537 }
1538
1539 /*
1540  * The file is not closed if it is opened due to the a request to change
1541  * the size of the file. The open call will not be needed once the
1542  * VFS layer lookup-intents are implemented.
1543  *
1544  * Close is called when the inode is destroyed.
1545  * If we haven't opened the file for O_WRONLY, we
1546  * need to in the size_change case to obtain a stateid.
1547  *
1548  * Got race?
1549  * Because OPEN is always done by name in nfsv4, it is
1550  * possible that we opened a different file by the same
1551  * name.  We can recognize this race condition, but we
1552  * can't do anything about it besides returning an error.
1553  *
1554  * This will be fixed with VFS changes (lookup-intent).
1555  */
1556 static int
1557 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1558                   struct iattr *sattr)
1559 {
1560         struct rpc_cred *cred;
1561         struct inode *inode = dentry->d_inode;
1562         struct nfs_open_context *ctx;
1563         struct nfs4_state *state = NULL;
1564         int status;
1565
1566         nfs_fattr_init(fattr);
1567
1568         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1569         if (IS_ERR(cred))
1570                 return PTR_ERR(cred);
1571
1572         /* Search for an existing open(O_WRITE) file */
1573         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1574         if (ctx != NULL)
1575                 state = ctx->state;
1576
1577         status = nfs4_do_setattr(inode, fattr, sattr, state);
1578         if (status == 0)
1579                 nfs_setattr_update_inode(inode, sattr);
1580         if (ctx != NULL)
1581                 put_nfs_open_context(ctx);
1582         put_rpccred(cred);
1583         return status;
1584 }
1585
1586 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1587                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1588 {
1589         int                    status;
1590         struct nfs_server *server = NFS_SERVER(dir);
1591         struct nfs4_lookup_arg args = {
1592                 .bitmask = server->attr_bitmask,
1593                 .dir_fh = NFS_FH(dir),
1594                 .name = name,
1595         };
1596         struct nfs4_lookup_res res = {
1597                 .server = server,
1598                 .fattr = fattr,
1599                 .fh = fhandle,
1600         };
1601         struct rpc_message msg = {
1602                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1603                 .rpc_argp = &args,
1604                 .rpc_resp = &res,
1605         };
1606
1607         nfs_fattr_init(fattr);
1608
1609         dprintk("NFS call  lookup %s\n", name->name);
1610         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1611         if (status == -NFS4ERR_MOVED)
1612                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1613         dprintk("NFS reply lookup: %d\n", status);
1614         return status;
1615 }
1616
1617 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618 {
1619         struct nfs4_exception exception = { };
1620         int err;
1621         do {
1622                 err = nfs4_handle_exception(NFS_SERVER(dir),
1623                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1624                                 &exception);
1625         } while (exception.retry);
1626         return err;
1627 }
1628
1629 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1630 {
1631         struct nfs4_accessargs args = {
1632                 .fh = NFS_FH(inode),
1633         };
1634         struct nfs4_accessres res = { 0 };
1635         struct rpc_message msg = {
1636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1637                 .rpc_argp = &args,
1638                 .rpc_resp = &res,
1639                 .rpc_cred = entry->cred,
1640         };
1641         int mode = entry->mask;
1642         int status;
1643
1644         /*
1645          * Determine which access bits we want to ask for...
1646          */
1647         if (mode & MAY_READ)
1648                 args.access |= NFS4_ACCESS_READ;
1649         if (S_ISDIR(inode->i_mode)) {
1650                 if (mode & MAY_WRITE)
1651                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1652                 if (mode & MAY_EXEC)
1653                         args.access |= NFS4_ACCESS_LOOKUP;
1654         } else {
1655                 if (mode & MAY_WRITE)
1656                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1657                 if (mode & MAY_EXEC)
1658                         args.access |= NFS4_ACCESS_EXECUTE;
1659         }
1660         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1661         if (!status) {
1662                 entry->mask = 0;
1663                 if (res.access & NFS4_ACCESS_READ)
1664                         entry->mask |= MAY_READ;
1665                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1666                         entry->mask |= MAY_WRITE;
1667                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1668                         entry->mask |= MAY_EXEC;
1669         }
1670         return status;
1671 }
1672
1673 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1674 {
1675         struct nfs4_exception exception = { };
1676         int err;
1677         do {
1678                 err = nfs4_handle_exception(NFS_SERVER(inode),
1679                                 _nfs4_proc_access(inode, entry),
1680                                 &exception);
1681         } while (exception.retry);
1682         return err;
1683 }
1684
1685 /*
1686  * TODO: For the time being, we don't try to get any attributes
1687  * along with any of the zero-copy operations READ, READDIR,
1688  * READLINK, WRITE.
1689  *
1690  * In the case of the first three, we want to put the GETATTR
1691  * after the read-type operation -- this is because it is hard
1692  * to predict the length of a GETATTR response in v4, and thus
1693  * align the READ data correctly.  This means that the GETATTR
1694  * may end up partially falling into the page cache, and we should
1695  * shift it into the 'tail' of the xdr_buf before processing.
1696  * To do this efficiently, we need to know the total length
1697  * of data received, which doesn't seem to be available outside
1698  * of the RPC layer.
1699  *
1700  * In the case of WRITE, we also want to put the GETATTR after
1701  * the operation -- in this case because we want to make sure
1702  * we get the post-operation mtime and size.  This means that
1703  * we can't use xdr_encode_pages() as written: we need a variant
1704  * of it which would leave room in the 'tail' iovec.
1705  *
1706  * Both of these changes to the XDR layer would in fact be quite
1707  * minor, but I decided to leave them for a subsequent patch.
1708  */
1709 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1710                 unsigned int pgbase, unsigned int pglen)
1711 {
1712         struct nfs4_readlink args = {
1713                 .fh       = NFS_FH(inode),
1714                 .pgbase   = pgbase,
1715                 .pglen    = pglen,
1716                 .pages    = &page,
1717         };
1718         struct rpc_message msg = {
1719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1720                 .rpc_argp = &args,
1721                 .rpc_resp = NULL,
1722         };
1723
1724         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1725 }
1726
1727 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1728                 unsigned int pgbase, unsigned int pglen)
1729 {
1730         struct nfs4_exception exception = { };
1731         int err;
1732         do {
1733                 err = nfs4_handle_exception(NFS_SERVER(inode),
1734                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1735                                 &exception);
1736         } while (exception.retry);
1737         return err;
1738 }
1739
1740 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1741 {
1742         int flags = rdata->flags;
1743         struct inode *inode = rdata->inode;
1744         struct nfs_fattr *fattr = rdata->res.fattr;
1745         struct nfs_server *server = NFS_SERVER(inode);
1746         struct rpc_message msg = {
1747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1748                 .rpc_argp       = &rdata->args,
1749                 .rpc_resp       = &rdata->res,
1750                 .rpc_cred       = rdata->cred,
1751         };
1752         unsigned long timestamp = jiffies;
1753         int status;
1754
1755         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1756                         (long long) rdata->args.offset);
1757
1758         nfs_fattr_init(fattr);
1759         status = rpc_call_sync(server->client, &msg, flags);
1760         if (!status)
1761                 renew_lease(server, timestamp);
1762         dprintk("NFS reply read: %d\n", status);
1763         return status;
1764 }
1765
1766 static int nfs4_proc_read(struct nfs_read_data *rdata)
1767 {
1768         struct nfs4_exception exception = { };
1769         int err;
1770         do {
1771                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1772                                 _nfs4_proc_read(rdata),
1773                                 &exception);
1774         } while (exception.retry);
1775         return err;
1776 }
1777
1778 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1779 {
1780         int rpcflags = wdata->flags;
1781         struct inode *inode = wdata->inode;
1782         struct nfs_fattr *fattr = wdata->res.fattr;
1783         struct nfs_server *server = NFS_SERVER(inode);
1784         struct rpc_message msg = {
1785                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1786                 .rpc_argp       = &wdata->args,
1787                 .rpc_resp       = &wdata->res,
1788                 .rpc_cred       = wdata->cred,
1789         };
1790         int status;
1791
1792         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1793                         (long long) wdata->args.offset);
1794
1795         wdata->args.bitmask = server->attr_bitmask;
1796         wdata->res.server = server;
1797         wdata->timestamp = jiffies;
1798         nfs_fattr_init(fattr);
1799         status = rpc_call_sync(server->client, &msg, rpcflags);
1800         dprintk("NFS reply write: %d\n", status);
1801         if (status < 0)
1802                 return status;
1803         renew_lease(server, wdata->timestamp);
1804         nfs_post_op_update_inode(inode, fattr);
1805         return wdata->res.count;
1806 }
1807
1808 static int nfs4_proc_write(struct nfs_write_data *wdata)
1809 {
1810         struct nfs4_exception exception = { };
1811         int err;
1812         do {
1813                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1814                                 _nfs4_proc_write(wdata),
1815                                 &exception);
1816         } while (exception.retry);
1817         return err;
1818 }
1819
1820 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1821 {
1822         struct inode *inode = cdata->inode;
1823         struct nfs_fattr *fattr = cdata->res.fattr;
1824         struct nfs_server *server = NFS_SERVER(inode);
1825         struct rpc_message msg = {
1826                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1827                 .rpc_argp       = &cdata->args,
1828                 .rpc_resp       = &cdata->res,
1829                 .rpc_cred       = cdata->cred,
1830         };
1831         int status;
1832
1833         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1834                         (long long) cdata->args.offset);
1835
1836         cdata->args.bitmask = server->attr_bitmask;
1837         cdata->res.server = server;
1838         cdata->timestamp = jiffies;
1839         nfs_fattr_init(fattr);
1840         status = rpc_call_sync(server->client, &msg, 0);
1841         if (status >= 0)
1842                 renew_lease(server, cdata->timestamp);
1843         dprintk("NFS reply commit: %d\n", status);
1844         if (status >= 0)
1845                 nfs_post_op_update_inode(inode, fattr);
1846         return status;
1847 }
1848
1849 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1850 {
1851         struct nfs4_exception exception = { };
1852         int err;
1853         do {
1854                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1855                                 _nfs4_proc_commit(cdata),
1856                                 &exception);
1857         } while (exception.retry);
1858         return err;
1859 }
1860
1861 /*
1862  * Got race?
1863  * We will need to arrange for the VFS layer to provide an atomic open.
1864  * Until then, this create/open method is prone to inefficiency and race
1865  * conditions due to the lookup, create, and open VFS calls from sys_open()
1866  * placed on the wire.
1867  *
1868  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1869  * The file will be opened again in the subsequent VFS open call
1870  * (nfs4_proc_file_open).
1871  *
1872  * The open for read will just hang around to be used by any process that
1873  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1874  */
1875
1876 static int
1877 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1878                  int flags, struct nameidata *nd)
1879 {
1880         struct nfs4_state *state;
1881         struct rpc_cred *cred;
1882         int status = 0;
1883
1884         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1885         if (IS_ERR(cred)) {
1886                 status = PTR_ERR(cred);
1887                 goto out;
1888         }
1889         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1890         put_rpccred(cred);
1891         if (IS_ERR(state)) {
1892                 status = PTR_ERR(state);
1893                 goto out;
1894         }
1895         d_instantiate(dentry, igrab(state->inode));
1896         if (flags & O_EXCL) {
1897                 struct nfs_fattr fattr;
1898                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1899                 if (status == 0)
1900                         nfs_setattr_update_inode(state->inode, sattr);
1901         }
1902         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1903                 status = nfs4_intent_set_file(nd, dentry, state);
1904         else
1905                 nfs4_close_state(state, flags);
1906 out:
1907         return status;
1908 }
1909
1910 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1911 {
1912         struct nfs_server *server = NFS_SERVER(dir);
1913         struct nfs4_remove_arg args = {
1914                 .fh = NFS_FH(dir),
1915                 .name = name,
1916                 .bitmask = server->attr_bitmask,
1917         };
1918         struct nfs_fattr dir_attr;
1919         struct nfs4_remove_res  res = {
1920                 .server = server,
1921                 .dir_attr = &dir_attr,
1922         };
1923         struct rpc_message msg = {
1924                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1925                 .rpc_argp       = &args,
1926                 .rpc_resp       = &res,
1927         };
1928         int                     status;
1929
1930         nfs_fattr_init(res.dir_attr);
1931         status = rpc_call_sync(server->client, &msg, 0);
1932         if (status == 0) {
1933                 update_changeattr(dir, &res.cinfo);
1934                 nfs_post_op_update_inode(dir, res.dir_attr);
1935         }
1936         return status;
1937 }
1938
1939 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1940 {
1941         struct nfs4_exception exception = { };
1942         int err;
1943         do {
1944                 err = nfs4_handle_exception(NFS_SERVER(dir),
1945                                 _nfs4_proc_remove(dir, name),
1946                                 &exception);
1947         } while (exception.retry);
1948         return err;
1949 }
1950
1951 struct unlink_desc {
1952         struct nfs4_remove_arg  args;
1953         struct nfs4_remove_res  res;
1954         struct nfs_fattr dir_attr;
1955 };
1956
1957 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1958                 struct qstr *name)
1959 {
1960         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1961         struct unlink_desc *up;
1962
1963         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1964         if (!up)
1965                 return -ENOMEM;
1966
1967         up->args.fh = NFS_FH(dir->d_inode);
1968         up->args.name = name;
1969         up->args.bitmask = server->attr_bitmask;
1970         up->res.server = server;
1971         up->res.dir_attr = &up->dir_attr;
1972
1973         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1974         msg->rpc_argp = &up->args;
1975         msg->rpc_resp = &up->res;
1976         return 0;
1977 }
1978
1979 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1980 {
1981         struct rpc_message *msg = &task->tk_msg;
1982         struct unlink_desc *up;
1983
1984         if (msg->rpc_resp != NULL) {
1985                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1986                 update_changeattr(dir->d_inode, &up->res.cinfo);
1987                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1988                 kfree(up);
1989                 msg->rpc_resp = NULL;
1990                 msg->rpc_argp = NULL;
1991         }
1992         return 0;
1993 }
1994
1995 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1996                 struct inode *new_dir, struct qstr *new_name)
1997 {
1998         struct nfs_server *server = NFS_SERVER(old_dir);
1999         struct nfs4_rename_arg arg = {
2000                 .old_dir = NFS_FH(old_dir),
2001                 .new_dir = NFS_FH(new_dir),
2002                 .old_name = old_name,
2003                 .new_name = new_name,
2004                 .bitmask = server->attr_bitmask,
2005         };
2006         struct nfs_fattr old_fattr, new_fattr;
2007         struct nfs4_rename_res res = {
2008                 .server = server,
2009                 .old_fattr = &old_fattr,
2010                 .new_fattr = &new_fattr,
2011         };
2012         struct rpc_message msg = {
2013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2014                 .rpc_argp = &arg,
2015                 .rpc_resp = &res,
2016         };
2017         int                     status;
2018
2019         nfs_fattr_init(res.old_fattr);
2020         nfs_fattr_init(res.new_fattr);
2021         status = rpc_call_sync(server->client, &msg, 0);
2022
2023         if (!status) {
2024                 update_changeattr(old_dir, &res.old_cinfo);
2025                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2026                 update_changeattr(new_dir, &res.new_cinfo);
2027                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2028         }
2029         return status;
2030 }
2031
2032 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2033                 struct inode *new_dir, struct qstr *new_name)
2034 {
2035         struct nfs4_exception exception = { };
2036         int err;
2037         do {
2038                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2039                                 _nfs4_proc_rename(old_dir, old_name,
2040                                         new_dir, new_name),
2041                                 &exception);
2042         } while (exception.retry);
2043         return err;
2044 }
2045
2046 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2047 {
2048         struct nfs_server *server = NFS_SERVER(inode);
2049         struct nfs4_link_arg arg = {
2050                 .fh     = NFS_FH(inode),
2051                 .dir_fh = NFS_FH(dir),
2052                 .name   = name,
2053                 .bitmask = server->attr_bitmask,
2054         };
2055         struct nfs_fattr fattr, dir_attr;
2056         struct nfs4_link_res res = {
2057                 .server = server,
2058                 .fattr = &fattr,
2059                 .dir_attr = &dir_attr,
2060         };
2061         struct rpc_message msg = {
2062                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2063                 .rpc_argp = &arg,
2064                 .rpc_resp = &res,
2065         };
2066         int                     status;
2067
2068         nfs_fattr_init(res.fattr);
2069         nfs_fattr_init(res.dir_attr);
2070         status = rpc_call_sync(server->client, &msg, 0);
2071         if (!status) {
2072                 update_changeattr(dir, &res.cinfo);
2073                 nfs_post_op_update_inode(dir, res.dir_attr);
2074                 nfs_post_op_update_inode(inode, res.fattr);
2075         }
2076
2077         return status;
2078 }
2079
2080 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2081 {
2082         struct nfs4_exception exception = { };
2083         int err;
2084         do {
2085                 err = nfs4_handle_exception(NFS_SERVER(inode),
2086                                 _nfs4_proc_link(inode, dir, name),
2087                                 &exception);
2088         } while (exception.retry);
2089         return err;
2090 }
2091
2092 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2093                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2094                 struct nfs_fattr *fattr)
2095 {
2096         struct nfs_server *server = NFS_SERVER(dir);
2097         struct nfs_fattr dir_fattr;
2098         struct nfs4_create_arg arg = {
2099                 .dir_fh = NFS_FH(dir),
2100                 .server = server,
2101                 .name = name,
2102                 .attrs = sattr,
2103                 .ftype = NF4LNK,
2104                 .bitmask = server->attr_bitmask,
2105         };
2106         struct nfs4_create_res res = {
2107                 .server = server,
2108                 .fh = fhandle,
2109                 .fattr = fattr,
2110                 .dir_fattr = &dir_fattr,
2111         };
2112         struct rpc_message msg = {
2113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2114                 .rpc_argp = &arg,
2115                 .rpc_resp = &res,
2116         };
2117         int                     status;
2118
2119         if (path->len > NFS4_MAXPATHLEN)
2120                 return -ENAMETOOLONG;
2121         arg.u.symlink = path;
2122         nfs_fattr_init(fattr);
2123         nfs_fattr_init(&dir_fattr);
2124
2125         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2126         if (!status)
2127                 update_changeattr(dir, &res.dir_cinfo);
2128         nfs_post_op_update_inode(dir, res.dir_fattr);
2129         return status;
2130 }
2131
2132 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2133                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2134                 struct nfs_fattr *fattr)
2135 {
2136         struct nfs4_exception exception = { };
2137         int err;
2138         do {
2139                 err = nfs4_handle_exception(NFS_SERVER(dir),
2140                                 _nfs4_proc_symlink(dir, name, path, sattr,
2141                                         fhandle, fattr),
2142                                 &exception);
2143         } while (exception.retry);
2144         return err;
2145 }
2146
2147 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2148                 struct iattr *sattr)
2149 {
2150         struct nfs_server *server = NFS_SERVER(dir);
2151         struct nfs_fh fhandle;
2152         struct nfs_fattr fattr, dir_fattr;
2153         struct nfs4_create_arg arg = {
2154                 .dir_fh = NFS_FH(dir),
2155                 .server = server,
2156                 .name = &dentry->d_name,
2157                 .attrs = sattr,
2158                 .ftype = NF4DIR,
2159                 .bitmask = server->attr_bitmask,
2160         };
2161         struct nfs4_create_res res = {
2162                 .server = server,
2163                 .fh = &fhandle,
2164                 .fattr = &fattr,
2165                 .dir_fattr = &dir_fattr,
2166         };
2167         struct rpc_message msg = {
2168                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2169                 .rpc_argp = &arg,
2170                 .rpc_resp = &res,
2171         };
2172         int                     status;
2173
2174         nfs_fattr_init(&fattr);
2175         nfs_fattr_init(&dir_fattr);
2176
2177         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2178         if (!status) {
2179                 update_changeattr(dir, &res.dir_cinfo);
2180                 nfs_post_op_update_inode(dir, res.dir_fattr);
2181                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2182         }
2183         return status;
2184 }
2185
2186 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2187                 struct iattr *sattr)
2188 {
2189         struct nfs4_exception exception = { };
2190         int err;
2191         do {
2192                 err = nfs4_handle_exception(NFS_SERVER(dir),
2193                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2194                                 &exception);
2195         } while (exception.retry);
2196         return err;
2197 }
2198
2199 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2200                   u64 cookie, struct page *page, unsigned int count, int plus)
2201 {
2202         struct inode            *dir = dentry->d_inode;
2203         struct nfs4_readdir_arg args = {
2204                 .fh = NFS_FH(dir),
2205                 .pages = &page,
2206                 .pgbase = 0,
2207                 .count = count,
2208                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2209         };
2210         struct nfs4_readdir_res res;
2211         struct rpc_message msg = {
2212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2213                 .rpc_argp = &args,
2214                 .rpc_resp = &res,
2215                 .rpc_cred = cred,
2216         };
2217         int                     status;
2218
2219         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2220                         dentry->d_parent->d_name.name,
2221                         dentry->d_name.name,
2222                         (unsigned long long)cookie);
2223         lock_kernel();
2224         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2225         res.pgbase = args.pgbase;
2226         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2227         if (status == 0)
2228                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2229         unlock_kernel();
2230         dprintk("%s: returns %d\n", __FUNCTION__, status);
2231         return status;
2232 }
2233
2234 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2235                   u64 cookie, struct page *page, unsigned int count, int plus)
2236 {
2237         struct nfs4_exception exception = { };
2238         int err;
2239         do {
2240                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2241                                 _nfs4_proc_readdir(dentry, cred, cookie,
2242                                         page, count, plus),
2243                                 &exception);
2244         } while (exception.retry);
2245         return err;
2246 }
2247
2248 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2249                 struct iattr *sattr, dev_t rdev)
2250 {
2251         struct nfs_server *server = NFS_SERVER(dir);
2252         struct nfs_fh fh;
2253         struct nfs_fattr fattr, dir_fattr;
2254         struct nfs4_create_arg arg = {
2255                 .dir_fh = NFS_FH(dir),
2256                 .server = server,
2257                 .name = &dentry->d_name,
2258                 .attrs = sattr,
2259                 .bitmask = server->attr_bitmask,
2260         };
2261         struct nfs4_create_res res = {
2262                 .server = server,
2263                 .fh = &fh,
2264                 .fattr = &fattr,
2265                 .dir_fattr = &dir_fattr,
2266         };
2267         struct rpc_message msg = {
2268                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2269                 .rpc_argp = &arg,
2270                 .rpc_resp = &res,
2271         };
2272         int                     status;
2273         int                     mode = sattr->ia_mode;
2274
2275         nfs_fattr_init(&fattr);
2276         nfs_fattr_init(&dir_fattr);
2277
2278         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2279         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2280         if (S_ISFIFO(mode))
2281                 arg.ftype = NF4FIFO;
2282         else if (S_ISBLK(mode)) {
2283                 arg.ftype = NF4BLK;
2284                 arg.u.device.specdata1 = MAJOR(rdev);
2285                 arg.u.device.specdata2 = MINOR(rdev);
2286         }
2287         else if (S_ISCHR(mode)) {
2288                 arg.ftype = NF4CHR;
2289                 arg.u.device.specdata1 = MAJOR(rdev);
2290                 arg.u.device.specdata2 = MINOR(rdev);
2291         }
2292         else
2293                 arg.ftype = NF4SOCK;
2294
2295         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2296         if (status == 0) {
2297                 update_changeattr(dir, &res.dir_cinfo);
2298                 nfs_post_op_update_inode(dir, res.dir_fattr);
2299                 status = nfs_instantiate(dentry, &fh, &fattr);
2300         }
2301         return status;
2302 }
2303
2304 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2305                 struct iattr *sattr, dev_t rdev)
2306 {
2307         struct nfs4_exception exception = { };
2308         int err;
2309         do {
2310                 err = nfs4_handle_exception(NFS_SERVER(dir),
2311                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2312                                 &exception);
2313         } while (exception.retry);
2314         return err;
2315 }
2316
2317 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2318                  struct nfs_fsstat *fsstat)
2319 {
2320         struct nfs4_statfs_arg args = {
2321                 .fh = fhandle,
2322                 .bitmask = server->attr_bitmask,
2323         };
2324         struct rpc_message msg = {
2325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2326                 .rpc_argp = &args,
2327                 .rpc_resp = fsstat,
2328         };
2329
2330         nfs_fattr_init(fsstat->fattr);
2331         return rpc_call_sync(server->client, &msg, 0);
2332 }
2333
2334 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2335 {
2336         struct nfs4_exception exception = { };
2337         int err;
2338         do {
2339                 err = nfs4_handle_exception(server,
2340                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2341                                 &exception);
2342         } while (exception.retry);
2343         return err;
2344 }
2345
2346 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2347                 struct nfs_fsinfo *fsinfo)
2348 {
2349         struct nfs4_fsinfo_arg args = {
2350                 .fh = fhandle,
2351                 .bitmask = server->attr_bitmask,
2352         };
2353         struct rpc_message msg = {
2354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2355                 .rpc_argp = &args,
2356                 .rpc_resp = fsinfo,
2357         };
2358
2359         return rpc_call_sync(server->client, &msg, 0);
2360 }
2361
2362 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2363 {
2364         struct nfs4_exception exception = { };
2365         int err;
2366
2367         do {
2368                 err = nfs4_handle_exception(server,
2369                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2370                                 &exception);
2371         } while (exception.retry);
2372         return err;
2373 }
2374
2375 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2376 {
2377         nfs_fattr_init(fsinfo->fattr);
2378         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2379 }
2380
2381 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2382                 struct nfs_pathconf *pathconf)
2383 {
2384         struct nfs4_pathconf_arg args = {
2385                 .fh = fhandle,
2386                 .bitmask = server->attr_bitmask,
2387         };
2388         struct rpc_message msg = {
2389                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2390                 .rpc_argp = &args,
2391                 .rpc_resp = pathconf,
2392         };
2393
2394         /* None of the pathconf attributes are mandatory to implement */
2395         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2396                 memset(pathconf, 0, sizeof(*pathconf));
2397                 return 0;
2398         }
2399
2400         nfs_fattr_init(pathconf->fattr);
2401         return rpc_call_sync(server->client, &msg, 0);
2402 }
2403
2404 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2405                 struct nfs_pathconf *pathconf)
2406 {
2407         struct nfs4_exception exception = { };
2408         int err;
2409
2410         do {
2411                 err = nfs4_handle_exception(server,
2412                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2413                                 &exception);
2414         } while (exception.retry);
2415         return err;
2416 }
2417
2418 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2419 {
2420         struct nfs_server *server = NFS_SERVER(data->inode);
2421
2422         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2423                 rpc_restart_call(task);
2424                 return -EAGAIN;
2425         }
2426         if (task->tk_status > 0)
2427                 renew_lease(server, data->timestamp);
2428         return 0;
2429 }
2430
2431 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2432 {
2433         struct rpc_message msg = {
2434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2435                 .rpc_argp = &data->args,
2436                 .rpc_resp = &data->res,
2437                 .rpc_cred = data->cred,
2438         };
2439
2440         data->timestamp   = jiffies;
2441
2442         rpc_call_setup(&data->task, &msg, 0);
2443 }
2444
2445 static int nfs4_write_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                 renew_lease(NFS_SERVER(inode), data->timestamp);
2455                 nfs_post_op_update_inode(inode, data->res.fattr);
2456         }
2457         return 0;
2458 }
2459
2460 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2461 {
2462         struct rpc_message msg = {
2463                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2464                 .rpc_argp = &data->args,
2465                 .rpc_resp = &data->res,
2466                 .rpc_cred = data->cred,
2467         };
2468         struct inode *inode = data->inode;
2469         struct nfs_server *server = NFS_SERVER(inode);
2470         int stable;
2471
2472         if (how & FLUSH_STABLE) {
2473                 if (!NFS_I(inode)->ncommit)
2474                         stable = NFS_FILE_SYNC;
2475                 else
2476                         stable = NFS_DATA_SYNC;
2477         } else
2478                 stable = NFS_UNSTABLE;
2479         data->args.stable = stable;
2480         data->args.bitmask = server->attr_bitmask;
2481         data->res.server = server;
2482
2483         data->timestamp   = jiffies;
2484
2485         /* Finalize the task. */
2486         rpc_call_setup(&data->task, &msg, 0);
2487 }
2488
2489 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2490 {
2491         struct inode *inode = data->inode;
2492
2493         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2494                 rpc_restart_call(task);
2495                 return -EAGAIN;
2496         }
2497         if (task->tk_status >= 0)
2498                 nfs_post_op_update_inode(inode, data->res.fattr);
2499         return 0;
2500 }
2501
2502 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2503 {
2504         struct rpc_message msg = {
2505                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2506                 .rpc_argp = &data->args,
2507                 .rpc_resp = &data->res,
2508                 .rpc_cred = data->cred,
2509         };
2510         struct nfs_server *server = NFS_SERVER(data->inode);
2511
2512         data->args.bitmask = server->attr_bitmask;
2513         data->res.server = server;
2514
2515         rpc_call_setup(&data->task, &msg, 0);
2516 }
2517
2518 /*
2519  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2520  * standalone procedure for queueing an asynchronous RENEW.
2521  */
2522 static void nfs4_renew_done(struct rpc_task *task, void *data)
2523 {
2524         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2525         unsigned long timestamp = (unsigned long)data;
2526
2527         if (task->tk_status < 0) {
2528                 switch (task->tk_status) {
2529                         case -NFS4ERR_STALE_CLIENTID:
2530                         case -NFS4ERR_EXPIRED:
2531                         case -NFS4ERR_CB_PATH_DOWN:
2532                                 nfs4_schedule_state_recovery(clp);
2533                 }
2534                 return;
2535         }
2536         spin_lock(&clp->cl_lock);
2537         if (time_before(clp->cl_last_renewal,timestamp))
2538                 clp->cl_last_renewal = timestamp;
2539         spin_unlock(&clp->cl_lock);
2540 }
2541
2542 static const struct rpc_call_ops nfs4_renew_ops = {
2543         .rpc_call_done = nfs4_renew_done,
2544 };
2545
2546 int nfs4_proc_async_renew(struct nfs4_client *clp, struct rpc_cred *cred)
2547 {
2548         struct rpc_message msg = {
2549                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2550                 .rpc_argp       = clp,
2551                 .rpc_cred       = cred,
2552         };
2553
2554         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2555                         &nfs4_renew_ops, (void *)jiffies);
2556 }
2557
2558 int nfs4_proc_renew(struct nfs4_client *clp, struct rpc_cred *cred)
2559 {
2560         struct rpc_message msg = {
2561                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2562                 .rpc_argp       = clp,
2563                 .rpc_cred       = cred,
2564         };
2565         unsigned long now = jiffies;
2566         int status;
2567
2568         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2569         if (status < 0)
2570                 return status;
2571         spin_lock(&clp->cl_lock);
2572         if (time_before(clp->cl_last_renewal,now))
2573                 clp->cl_last_renewal = now;
2574         spin_unlock(&clp->cl_lock);
2575         return 0;
2576 }
2577
2578 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2579 {
2580         return (server->caps & NFS_CAP_ACLS)
2581                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2582                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2583 }
2584
2585 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2586  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2587  * the stack.
2588  */
2589 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2590
2591 static void buf_to_pages(const void *buf, size_t buflen,
2592                 struct page **pages, unsigned int *pgbase)
2593 {
2594         const void *p = buf;
2595
2596         *pgbase = offset_in_page(buf);
2597         p -= *pgbase;
2598         while (p < buf + buflen) {
2599                 *(pages++) = virt_to_page(p);
2600                 p += PAGE_CACHE_SIZE;
2601         }
2602 }
2603
2604 struct nfs4_cached_acl {
2605         int cached;
2606         size_t len;
2607         char data[0];
2608 };
2609
2610 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2611 {
2612         struct nfs_inode *nfsi = NFS_I(inode);
2613
2614         spin_lock(&inode->i_lock);
2615         kfree(nfsi->nfs4_acl);
2616         nfsi->nfs4_acl = acl;
2617         spin_unlock(&inode->i_lock);
2618 }
2619
2620 static void nfs4_zap_acl_attr(struct inode *inode)
2621 {
2622         nfs4_set_cached_acl(inode, NULL);
2623 }
2624
2625 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2626 {
2627         struct nfs_inode *nfsi = NFS_I(inode);
2628         struct nfs4_cached_acl *acl;
2629         int ret = -ENOENT;
2630
2631         spin_lock(&inode->i_lock);
2632         acl = nfsi->nfs4_acl;
2633         if (acl == NULL)
2634                 goto out;
2635         if (buf == NULL) /* user is just asking for length */
2636                 goto out_len;
2637         if (acl->cached == 0)
2638                 goto out;
2639         ret = -ERANGE; /* see getxattr(2) man page */
2640         if (acl->len > buflen)
2641                 goto out;
2642         memcpy(buf, acl->data, acl->len);
2643 out_len:
2644         ret = acl->len;
2645 out:
2646         spin_unlock(&inode->i_lock);
2647         return ret;
2648 }
2649
2650 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2651 {
2652         struct nfs4_cached_acl *acl;
2653
2654         if (buf && acl_len <= PAGE_SIZE) {
2655                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2656                 if (acl == NULL)
2657                         goto out;
2658                 acl->cached = 1;
2659                 memcpy(acl->data, buf, acl_len);
2660         } else {
2661                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2662                 if (acl == NULL)
2663                         goto out;
2664                 acl->cached = 0;
2665         }
2666         acl->len = acl_len;
2667 out:
2668         nfs4_set_cached_acl(inode, acl);
2669 }
2670
2671 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2672 {
2673         struct page *pages[NFS4ACL_MAXPAGES];
2674         struct nfs_getaclargs args = {
2675                 .fh = NFS_FH(inode),
2676                 .acl_pages = pages,
2677                 .acl_len = buflen,
2678         };
2679         size_t resp_len = buflen;
2680         void *resp_buf;
2681         struct rpc_message msg = {
2682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2683                 .rpc_argp = &args,
2684                 .rpc_resp = &resp_len,
2685         };
2686         struct page *localpage = NULL;
2687         int ret;
2688
2689         if (buflen < PAGE_SIZE) {
2690                 /* As long as we're doing a round trip to the server anyway,
2691                  * let's be prepared for a page of acl data. */
2692                 localpage = alloc_page(GFP_KERNEL);
2693                 resp_buf = page_address(localpage);
2694                 if (localpage == NULL)
2695                         return -ENOMEM;
2696                 args.acl_pages[0] = localpage;
2697                 args.acl_pgbase = 0;
2698                 resp_len = args.acl_len = PAGE_SIZE;
2699         } else {
2700                 resp_buf = buf;
2701                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2702         }
2703         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2704         if (ret)
2705                 goto out_free;
2706         if (resp_len > args.acl_len)
2707                 nfs4_write_cached_acl(inode, NULL, resp_len);
2708         else
2709                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2710         if (buf) {
2711                 ret = -ERANGE;
2712                 if (resp_len > buflen)
2713                         goto out_free;
2714                 if (localpage)
2715                         memcpy(buf, resp_buf, resp_len);
2716         }
2717         ret = resp_len;
2718 out_free:
2719         if (localpage)
2720                 __free_page(localpage);
2721         return ret;
2722 }
2723
2724 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2725 {
2726         struct nfs4_exception exception = { };
2727         ssize_t ret;
2728         do {
2729                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2730                 if (ret >= 0)
2731                         break;
2732                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2733         } while (exception.retry);
2734         return ret;
2735 }
2736
2737 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2738 {
2739         struct nfs_server *server = NFS_SERVER(inode);
2740         int ret;
2741
2742         if (!nfs4_server_supports_acls(server))
2743                 return -EOPNOTSUPP;
2744         ret = nfs_revalidate_inode(server, inode);
2745         if (ret < 0)
2746                 return ret;
2747         ret = nfs4_read_cached_acl(inode, buf, buflen);
2748         if (ret != -ENOENT)
2749                 return ret;
2750         return nfs4_get_acl_uncached(inode, buf, buflen);
2751 }
2752
2753 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2754 {
2755         struct nfs_server *server = NFS_SERVER(inode);
2756         struct page *pages[NFS4ACL_MAXPAGES];
2757         struct nfs_setaclargs arg = {
2758                 .fh             = NFS_FH(inode),
2759                 .acl_pages      = pages,
2760                 .acl_len        = buflen,
2761         };
2762         struct rpc_message msg = {
2763                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2764                 .rpc_argp       = &arg,
2765                 .rpc_resp       = NULL,
2766         };
2767         int ret;
2768
2769         if (!nfs4_server_supports_acls(server))
2770                 return -EOPNOTSUPP;
2771         nfs_inode_return_delegation(inode);
2772         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2773         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2774         if (ret == 0)
2775                 nfs4_write_cached_acl(inode, buf, buflen);
2776         return ret;
2777 }
2778
2779 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2780 {
2781         struct nfs4_exception exception = { };
2782         int err;
2783         do {
2784                 err = nfs4_handle_exception(NFS_SERVER(inode),
2785                                 __nfs4_proc_set_acl(inode, buf, buflen),
2786                                 &exception);
2787         } while (exception.retry);
2788         return err;
2789 }
2790
2791 static int
2792 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2793 {
2794         struct nfs4_client *clp = server->nfs4_state;
2795
2796         if (!clp || task->tk_status >= 0)
2797                 return 0;
2798         switch(task->tk_status) {
2799                 case -NFS4ERR_STALE_CLIENTID:
2800                 case -NFS4ERR_STALE_STATEID:
2801                 case -NFS4ERR_EXPIRED:
2802                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2803                         nfs4_schedule_state_recovery(clp);
2804                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2805                                 rpc_wake_up_task(task);
2806                         task->tk_status = 0;
2807                         return -EAGAIN;
2808                 case -NFS4ERR_DELAY:
2809                         nfs_inc_server_stats((struct nfs_server *) server,
2810                                                 NFSIOS_DELAY);
2811                 case -NFS4ERR_GRACE:
2812                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2813                         task->tk_status = 0;
2814                         return -EAGAIN;
2815                 case -NFS4ERR_OLD_STATEID:
2816                         task->tk_status = 0;
2817                         return -EAGAIN;
2818         }
2819         task->tk_status = nfs4_map_errors(task->tk_status);
2820         return 0;
2821 }
2822
2823 static int nfs4_wait_bit_interruptible(void *word)
2824 {
2825         if (signal_pending(current))
2826                 return -ERESTARTSYS;
2827         schedule();
2828         return 0;
2829 }
2830
2831 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2832 {
2833         sigset_t oldset;
2834         int res;
2835
2836         might_sleep();
2837
2838         rpc_clnt_sigmask(clnt, &oldset);
2839         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2840                         nfs4_wait_bit_interruptible,
2841                         TASK_INTERRUPTIBLE);
2842         rpc_clnt_sigunmask(clnt, &oldset);
2843         return res;
2844 }
2845
2846 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2847 {
2848         sigset_t oldset;
2849         int res = 0;
2850
2851         might_sleep();
2852
2853         if (*timeout <= 0)
2854                 *timeout = NFS4_POLL_RETRY_MIN;
2855         if (*timeout > NFS4_POLL_RETRY_MAX)
2856                 *timeout = NFS4_POLL_RETRY_MAX;
2857         rpc_clnt_sigmask(clnt, &oldset);
2858         if (clnt->cl_intr) {
2859                 schedule_timeout_interruptible(*timeout);
2860                 if (signalled())
2861                         res = -ERESTARTSYS;
2862         } else
2863                 schedule_timeout_uninterruptible(*timeout);
2864         rpc_clnt_sigunmask(clnt, &oldset);
2865         *timeout <<= 1;
2866         return res;
2867 }
2868
2869 /* This is the error handling routine for processes that are allowed
2870  * to sleep.
2871  */
2872 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2873 {
2874         struct nfs4_client *clp = server->nfs4_state;
2875         int ret = errorcode;
2876
2877         exception->retry = 0;
2878         switch(errorcode) {
2879                 case 0:
2880                         return 0;
2881                 case -NFS4ERR_STALE_CLIENTID:
2882                 case -NFS4ERR_STALE_STATEID:
2883                 case -NFS4ERR_EXPIRED:
2884                         nfs4_schedule_state_recovery(clp);
2885                         ret = nfs4_wait_clnt_recover(server->client, clp);
2886                         if (ret == 0)
2887                                 exception->retry = 1;
2888                         break;
2889                 case -NFS4ERR_GRACE:
2890                 case -NFS4ERR_DELAY:
2891                         ret = nfs4_delay(server->client, &exception->timeout);
2892                         if (ret != 0)
2893                                 break;
2894                 case -NFS4ERR_OLD_STATEID:
2895                         exception->retry = 1;
2896         }
2897         /* We failed to handle the error */
2898         return nfs4_map_errors(ret);
2899 }
2900
2901 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2902 {
2903         nfs4_verifier sc_verifier;
2904         struct nfs4_setclientid setclientid = {
2905                 .sc_verifier = &sc_verifier,
2906                 .sc_prog = program,
2907         };
2908         struct rpc_message msg = {
2909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2910                 .rpc_argp = &setclientid,
2911                 .rpc_resp = clp,
2912                 .rpc_cred = cred,
2913         };
2914         u32 *p;
2915         int loop = 0;
2916         int status;
2917
2918         p = (u32*)sc_verifier.data;
2919         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2920         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2921
2922         for(;;) {
2923                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2924                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2925                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2926                                 cred->cr_ops->cr_name,
2927                                 clp->cl_id_uniquifier);
2928                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2929                                 sizeof(setclientid.sc_netid), "tcp");
2930                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2931                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2932                                 clp->cl_ipaddr, port >> 8, port & 255);
2933
2934                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2935                 if (status != -NFS4ERR_CLID_INUSE)
2936                         break;
2937                 if (signalled())
2938                         break;
2939                 if (loop++ & 1)
2940                         ssleep(clp->cl_lease_time + 1);
2941                 else
2942                         if (++clp->cl_id_uniquifier == 0)
2943                                 break;
2944         }
2945         return status;
2946 }
2947
2948 static int _nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2949 {
2950         struct nfs_fsinfo fsinfo;
2951         struct rpc_message msg = {
2952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2953                 .rpc_argp = clp,
2954                 .rpc_resp = &fsinfo,
2955                 .rpc_cred = cred,
2956         };
2957         unsigned long now;
2958         int status;
2959
2960         now = jiffies;
2961         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2962         if (status == 0) {
2963                 spin_lock(&clp->cl_lock);
2964                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2965                 clp->cl_last_renewal = now;
2966                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2967                 spin_unlock(&clp->cl_lock);
2968         }
2969         return status;
2970 }
2971
2972 int nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2973 {
2974         long timeout;
2975         int err;
2976         do {
2977                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2978                 switch (err) {
2979                         case 0:
2980                                 return err;
2981                         case -NFS4ERR_RESOURCE:
2982                                 /* The IBM lawyers misread another document! */
2983                         case -NFS4ERR_DELAY:
2984                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2985                 }
2986         } while (err == 0);
2987         return err;
2988 }
2989
2990 struct nfs4_delegreturndata {
2991         struct nfs4_delegreturnargs args;
2992         struct nfs4_delegreturnres res;
2993         struct nfs_fh fh;
2994         nfs4_stateid stateid;
2995         struct rpc_cred *cred;
2996         unsigned long timestamp;
2997         struct nfs_fattr fattr;
2998         int rpc_status;
2999 };
3000
3001 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3002 {
3003         struct nfs4_delegreturndata *data = calldata;
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3006                 .rpc_argp = &data->args,
3007                 .rpc_resp = &data->res,
3008                 .rpc_cred = data->cred,
3009         };
3010         nfs_fattr_init(data->res.fattr);
3011         rpc_call_setup(task, &msg, 0);
3012 }
3013
3014 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3015 {
3016         struct nfs4_delegreturndata *data = calldata;
3017         data->rpc_status = task->tk_status;
3018         if (data->rpc_status == 0)
3019                 renew_lease(data->res.server, data->timestamp);
3020 }
3021
3022 static void nfs4_delegreturn_release(void *calldata)
3023 {
3024         struct nfs4_delegreturndata *data = calldata;
3025
3026         put_rpccred(data->cred);
3027         kfree(calldata);
3028 }
3029
3030 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3031         .rpc_call_prepare = nfs4_delegreturn_prepare,
3032         .rpc_call_done = nfs4_delegreturn_done,
3033         .rpc_release = nfs4_delegreturn_release,
3034 };
3035
3036 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3037 {
3038         struct nfs4_delegreturndata *data;
3039         struct nfs_server *server = NFS_SERVER(inode);
3040         struct rpc_task *task;
3041         int status;
3042
3043         data = kmalloc(sizeof(*data), GFP_KERNEL);
3044         if (data == NULL)
3045                 return -ENOMEM;
3046         data->args.fhandle = &data->fh;
3047         data->args.stateid = &data->stateid;
3048         data->args.bitmask = server->attr_bitmask;
3049         nfs_copy_fh(&data->fh, NFS_FH(inode));
3050         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3051         data->res.fattr = &data->fattr;
3052         data->res.server = server;
3053         data->cred = get_rpccred(cred);
3054         data->timestamp = jiffies;
3055         data->rpc_status = 0;
3056
3057         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3058         if (IS_ERR(task))
3059                 return PTR_ERR(task);
3060         status = nfs4_wait_for_completion_rpc_task(task);
3061         if (status == 0) {
3062                 status = data->rpc_status;
3063                 if (status == 0)
3064                         nfs_post_op_update_inode(inode, &data->fattr);
3065         }
3066         rpc_release_task(task);
3067         return status;
3068 }
3069
3070 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3071 {
3072         struct nfs_server *server = NFS_SERVER(inode);
3073         struct nfs4_exception exception = { };
3074         int err;
3075         do {
3076                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3077                 switch (err) {
3078                         case -NFS4ERR_STALE_STATEID:
3079                         case -NFS4ERR_EXPIRED:
3080                                 nfs4_schedule_state_recovery(server->nfs4_state);
3081                         case 0:
3082                                 return 0;
3083                 }
3084                 err = nfs4_handle_exception(server, err, &exception);
3085         } while (exception.retry);
3086         return err;
3087 }
3088
3089 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3090 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3091
3092 /*
3093  * sleep, with exponential backoff, and retry the LOCK operation.
3094  */
3095 static unsigned long
3096 nfs4_set_lock_task_retry(unsigned long timeout)
3097 {
3098         schedule_timeout_interruptible(timeout);
3099         timeout <<= 1;
3100         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3101                 return NFS4_LOCK_MAXTIMEOUT;
3102         return timeout;
3103 }
3104
3105 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3106 {
3107         struct inode *inode = state->inode;
3108         struct nfs_server *server = NFS_SERVER(inode);
3109         struct nfs4_client *clp = server->nfs4_state;
3110         struct nfs_lockt_args arg = {
3111                 .fh = NFS_FH(inode),
3112                 .fl = request,
3113         };
3114         struct nfs_lockt_res res = {
3115                 .denied = request,
3116         };
3117         struct rpc_message msg = {
3118                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3119                 .rpc_argp       = &arg,
3120                 .rpc_resp       = &res,
3121                 .rpc_cred       = state->owner->so_cred,
3122         };
3123         struct nfs4_lock_state *lsp;
3124         int status;
3125
3126         down_read(&clp->cl_sem);
3127         arg.lock_owner.clientid = clp->cl_clientid;
3128         status = nfs4_set_lock_state(state, request);
3129         if (status != 0)
3130                 goto out;
3131         lsp = request->fl_u.nfs4_fl.owner;
3132         arg.lock_owner.id = lsp->ls_id;
3133         status = rpc_call_sync(server->client, &msg, 0);
3134         switch (status) {
3135                 case 0:
3136                         request->fl_type = F_UNLCK;
3137                         break;
3138                 case -NFS4ERR_DENIED:
3139                         status = 0;
3140         }
3141 out:
3142         up_read(&clp->cl_sem);
3143         return status;
3144 }
3145
3146 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3147 {
3148         struct nfs4_exception exception = { };
3149         int err;
3150
3151         do {
3152                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3153                                 _nfs4_proc_getlk(state, cmd, request),
3154                                 &exception);
3155         } while (exception.retry);
3156         return err;
3157 }
3158
3159 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3160 {
3161         int res = 0;
3162         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3163                 case FL_POSIX:
3164                         res = posix_lock_file_wait(file, fl);
3165                         break;
3166                 case FL_FLOCK:
3167                         res = flock_lock_file_wait(file, fl);
3168                         break;
3169                 default:
3170                         BUG();
3171         }
3172         return res;
3173 }
3174
3175 struct nfs4_unlockdata {
3176         struct nfs_locku_args arg;
3177         struct nfs_locku_res res;
3178         struct nfs4_lock_state *lsp;
3179         struct nfs_open_context *ctx;
3180         struct file_lock fl;
3181         const struct nfs_server *server;
3182         unsigned long timestamp;
3183 };
3184
3185 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3186                 struct nfs_open_context *ctx,
3187                 struct nfs4_lock_state *lsp,
3188                 struct nfs_seqid *seqid)
3189 {
3190         struct nfs4_unlockdata *p;
3191         struct inode *inode = lsp->ls_state->inode;
3192
3193         p = kmalloc(sizeof(*p), GFP_KERNEL);
3194         if (p == NULL)
3195                 return NULL;
3196         p->arg.fh = NFS_FH(inode);
3197         p->arg.fl = &p->fl;
3198         p->arg.seqid = seqid;
3199         p->arg.stateid = &lsp->ls_stateid;
3200         p->lsp = lsp;
3201         atomic_inc(&lsp->ls_count);
3202         /* Ensure we don't close file until we're done freeing locks! */
3203         p->ctx = get_nfs_open_context(ctx);
3204         memcpy(&p->fl, fl, sizeof(p->fl));
3205         p->server = NFS_SERVER(inode);
3206         return p;
3207 }
3208
3209 static void nfs4_locku_release_calldata(void *data)
3210 {
3211         struct nfs4_unlockdata *calldata = data;
3212         nfs_free_seqid(calldata->arg.seqid);
3213         nfs4_put_lock_state(calldata->lsp);
3214         put_nfs_open_context(calldata->ctx);
3215         kfree(calldata);
3216 }
3217
3218 static void nfs4_locku_done(struct rpc_task *task, void *data)
3219 {
3220         struct nfs4_unlockdata *calldata = data;
3221
3222         if (RPC_ASSASSINATED(task))
3223                 return;
3224         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3225         switch (task->tk_status) {
3226                 case 0:
3227                         memcpy(calldata->lsp->ls_stateid.data,
3228                                         calldata->res.stateid.data,
3229                                         sizeof(calldata->lsp->ls_stateid.data));
3230                         renew_lease(calldata->server, calldata->timestamp);
3231                         break;
3232                 case -NFS4ERR_STALE_STATEID:
3233                 case -NFS4ERR_EXPIRED:
3234                         nfs4_schedule_state_recovery(calldata->server->nfs4_state);
3235                         break;
3236                 default:
3237                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3238                                 rpc_restart_call(task);
3239                         }
3240         }
3241 }
3242
3243 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3244 {
3245         struct nfs4_unlockdata *calldata = data;
3246         struct rpc_message msg = {
3247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3248                 .rpc_argp       = &calldata->arg,
3249                 .rpc_resp       = &calldata->res,
3250                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3251         };
3252
3253         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3254                 return;
3255         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3256                 /* Note: exit _without_ running nfs4_locku_done */
3257                 task->tk_action = NULL;
3258                 return;
3259         }
3260         calldata->timestamp = jiffies;
3261         rpc_call_setup(task, &msg, 0);
3262 }
3263
3264 static const struct rpc_call_ops nfs4_locku_ops = {
3265         .rpc_call_prepare = nfs4_locku_prepare,
3266         .rpc_call_done = nfs4_locku_done,
3267         .rpc_release = nfs4_locku_release_calldata,
3268 };
3269
3270 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3271                 struct nfs_open_context *ctx,
3272                 struct nfs4_lock_state *lsp,
3273                 struct nfs_seqid *seqid)
3274 {
3275         struct nfs4_unlockdata *data;
3276
3277         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3278         if (data == NULL) {
3279                 nfs_free_seqid(seqid);
3280                 return ERR_PTR(-ENOMEM);
3281         }
3282
3283         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3284 }
3285
3286 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3287 {
3288         struct nfs_seqid *seqid;
3289         struct nfs4_lock_state *lsp;
3290         struct rpc_task *task;
3291         int status = 0;
3292
3293         status = nfs4_set_lock_state(state, request);
3294         /* Unlock _before_ we do the RPC call */
3295         request->fl_flags |= FL_EXISTS;
3296         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3297                 goto out;
3298         if (status != 0)
3299                 goto out;
3300         /* Is this a delegated lock? */
3301         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3302                 goto out;
3303         lsp = request->fl_u.nfs4_fl.owner;
3304         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3305         status = -ENOMEM;
3306         if (seqid == NULL)
3307                 goto out;
3308         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3309         status = PTR_ERR(task);
3310         if (IS_ERR(task))
3311                 goto out;
3312         status = nfs4_wait_for_completion_rpc_task(task);
3313         rpc_release_task(task);
3314 out:
3315         return status;
3316 }
3317
3318 struct nfs4_lockdata {
3319         struct nfs_lock_args arg;
3320         struct nfs_lock_res res;
3321         struct nfs4_lock_state *lsp;
3322         struct nfs_open_context *ctx;
3323         struct file_lock fl;
3324         unsigned long timestamp;
3325         int rpc_status;
3326         int cancelled;
3327 };
3328
3329 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3330                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3331 {
3332         struct nfs4_lockdata *p;
3333         struct inode *inode = lsp->ls_state->inode;
3334         struct nfs_server *server = NFS_SERVER(inode);
3335
3336         p = kzalloc(sizeof(*p), GFP_KERNEL);
3337         if (p == NULL)
3338                 return NULL;
3339
3340         p->arg.fh = NFS_FH(inode);
3341         p->arg.fl = &p->fl;
3342         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3343         if (p->arg.lock_seqid == NULL)
3344                 goto out_free;
3345         p->arg.lock_stateid = &lsp->ls_stateid;
3346         p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3347         p->arg.lock_owner.id = lsp->ls_id;
3348         p->lsp = lsp;
3349         atomic_inc(&lsp->ls_count);
3350         p->ctx = get_nfs_open_context(ctx);
3351         memcpy(&p->fl, fl, sizeof(p->fl));
3352         return p;
3353 out_free:
3354         kfree(p);
3355         return NULL;
3356 }
3357
3358 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3359 {
3360         struct nfs4_lockdata *data = calldata;
3361         struct nfs4_state *state = data->lsp->ls_state;
3362         struct nfs4_state_owner *sp = state->owner;
3363         struct rpc_message msg = {
3364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3365                 .rpc_argp = &data->arg,
3366                 .rpc_resp = &data->res,
3367                 .rpc_cred = sp->so_cred,
3368         };
3369
3370         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3371                 return;
3372         dprintk("%s: begin!\n", __FUNCTION__);
3373         /* Do we need to do an open_to_lock_owner? */
3374         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3375                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3376                 if (data->arg.open_seqid == NULL) {
3377                         data->rpc_status = -ENOMEM;
3378                         task->tk_action = NULL;
3379                         goto out;
3380                 }
3381                 data->arg.open_stateid = &state->stateid;
3382                 data->arg.new_lock_owner = 1;
3383         }
3384         data->timestamp = jiffies;
3385         rpc_call_setup(task, &msg, 0);
3386 out:
3387         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3388 }
3389
3390 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3391 {
3392         struct nfs4_lockdata *data = calldata;
3393
3394         dprintk("%s: begin!\n", __FUNCTION__);
3395
3396         data->rpc_status = task->tk_status;
3397         if (RPC_ASSASSINATED(task))
3398                 goto out;
3399         if (data->arg.new_lock_owner != 0) {
3400                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3401                 if (data->rpc_status == 0)
3402                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3403                 else
3404                         goto out;
3405         }
3406         if (data->rpc_status == 0) {
3407                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3408                                         sizeof(data->lsp->ls_stateid.data));
3409                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3410                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3411         }
3412         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3413 out:
3414         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3415 }
3416
3417 static void nfs4_lock_release(void *calldata)
3418 {
3419         struct nfs4_lockdata *data = calldata;
3420
3421         dprintk("%s: begin!\n", __FUNCTION__);
3422         if (data->arg.open_seqid != NULL)
3423                 nfs_free_seqid(data->arg.open_seqid);
3424         if (data->cancelled != 0) {
3425                 struct rpc_task *task;
3426                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3427                                 data->arg.lock_seqid);
3428                 if (!IS_ERR(task))
3429                         rpc_release_task(task);
3430                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3431         } else
3432                 nfs_free_seqid(data->arg.lock_seqid);
3433         nfs4_put_lock_state(data->lsp);
3434         put_nfs_open_context(data->ctx);
3435         kfree(data);
3436         dprintk("%s: done!\n", __FUNCTION__);
3437 }
3438
3439 static const struct rpc_call_ops nfs4_lock_ops = {
3440         .rpc_call_prepare = nfs4_lock_prepare,
3441         .rpc_call_done = nfs4_lock_done,
3442         .rpc_release = nfs4_lock_release,
3443 };
3444
3445 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3446 {
3447         struct nfs4_lockdata *data;
3448         struct rpc_task *task;
3449         int ret;
3450
3451         dprintk("%s: begin!\n", __FUNCTION__);
3452         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3453                         fl->fl_u.nfs4_fl.owner);
3454         if (data == NULL)
3455                 return -ENOMEM;
3456         if (IS_SETLKW(cmd))
3457                 data->arg.block = 1;
3458         if (reclaim != 0)
3459                 data->arg.reclaim = 1;
3460         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3461                         &nfs4_lock_ops, data);
3462         if (IS_ERR(task))
3463                 return PTR_ERR(task);
3464         ret = nfs4_wait_for_completion_rpc_task(task);
3465         if (ret == 0) {
3466                 ret = data->rpc_status;
3467                 if (ret == -NFS4ERR_DENIED)
3468                         ret = -EAGAIN;
3469         } else
3470                 data->cancelled = 1;
3471         rpc_release_task(task);
3472         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3473         return ret;
3474 }
3475
3476 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3477 {
3478         struct nfs_server *server = NFS_SERVER(state->inode);
3479         struct nfs4_exception exception = { };
3480         int err;
3481
3482         do {
3483                 /* Cache the lock if possible... */
3484                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485                         return 0;
3486                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3487                 if (err != -NFS4ERR_DELAY)
3488                         break;
3489                 nfs4_handle_exception(server, err, &exception);
3490         } while (exception.retry);
3491         return err;
3492 }
3493
3494 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3495 {
3496         struct nfs_server *server = NFS_SERVER(state->inode);
3497         struct nfs4_exception exception = { };
3498         int err;
3499
3500         err = nfs4_set_lock_state(state, request);
3501         if (err != 0)
3502                 return err;
3503         do {
3504                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3505                         return 0;
3506                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3507                 if (err != -NFS4ERR_DELAY)
3508                         break;
3509                 nfs4_handle_exception(server, err, &exception);
3510         } while (exception.retry);
3511         return err;
3512 }
3513
3514 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3515 {
3516         struct nfs4_client *clp = state->owner->so_client;
3517         unsigned char fl_flags = request->fl_flags;
3518         int status;
3519
3520         /* Is this a delegated open? */
3521         status = nfs4_set_lock_state(state, request);
3522         if (status != 0)
3523                 goto out;
3524         request->fl_flags |= FL_ACCESS;
3525         status = do_vfs_lock(request->fl_file, request);
3526         if (status < 0)
3527                 goto out;
3528         down_read(&clp->cl_sem);
3529         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3530                 struct nfs_inode *nfsi = NFS_I(state->inode);
3531                 /* Yes: cache locks! */
3532                 down_read(&nfsi->rwsem);
3533                 /* ...but avoid races with delegation recall... */
3534                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3535                         request->fl_flags = fl_flags & ~FL_SLEEP;
3536                         status = do_vfs_lock(request->fl_file, request);
3537                         up_read(&nfsi->rwsem);
3538                         goto out_unlock;
3539                 }
3540                 up_read(&nfsi->rwsem);
3541         }
3542         status = _nfs4_do_setlk(state, cmd, request, 0);
3543         if (status != 0)
3544                 goto out_unlock;
3545         /* Note: we always want to sleep here! */
3546         request->fl_flags = fl_flags | FL_SLEEP;
3547         if (do_vfs_lock(request->fl_file, request) < 0)
3548                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3549 out_unlock:
3550         up_read(&clp->cl_sem);
3551 out:
3552         request->fl_flags = fl_flags;
3553         return status;
3554 }
3555
3556 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3557 {
3558         struct nfs4_exception exception = { };
3559         int err;
3560
3561         do {
3562                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3563                                 _nfs4_proc_setlk(state, cmd, request),
3564                                 &exception);
3565         } while (exception.retry);
3566         return err;
3567 }
3568
3569 static int
3570 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3571 {
3572         struct nfs_open_context *ctx;
3573         struct nfs4_state *state;
3574         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3575         int status;
3576
3577         /* verify open state */
3578         ctx = (struct nfs_open_context *)filp->private_data;
3579         state = ctx->state;
3580
3581         if (request->fl_start < 0 || request->fl_end < 0)
3582                 return -EINVAL;
3583
3584         if (IS_GETLK(cmd))
3585                 return nfs4_proc_getlk(state, F_GETLK, request);
3586
3587         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3588                 return -EINVAL;
3589
3590         if (request->fl_type == F_UNLCK)
3591                 return nfs4_proc_unlck(state, cmd, request);
3592
3593         do {
3594                 status = nfs4_proc_setlk(state, cmd, request);
3595                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3596                         break;
3597                 timeout = nfs4_set_lock_task_retry(timeout);
3598                 status = -ERESTARTSYS;
3599                 if (signalled())
3600                         break;
3601         } while(status < 0);
3602         return status;
3603 }
3604
3605 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3606 {
3607         struct nfs_server *server = NFS_SERVER(state->inode);
3608         struct nfs4_exception exception = { };
3609         int err;
3610
3611         err = nfs4_set_lock_state(state, fl);
3612         if (err != 0)
3613                 goto out;
3614         do {
3615                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3616                 if (err != -NFS4ERR_DELAY)
3617                         break;
3618                 err = nfs4_handle_exception(server, err, &exception);
3619         } while (exception.retry);
3620 out:
3621         return err;
3622 }
3623
3624 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3625
3626 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3627                 size_t buflen, int flags)
3628 {
3629         struct inode *inode = dentry->d_inode;
3630
3631         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3632                 return -EOPNOTSUPP;
3633
3634         if (!S_ISREG(inode->i_mode) &&
3635             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3636                 return -EPERM;
3637
3638         return nfs4_proc_set_acl(inode, buf, buflen);
3639 }
3640
3641 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3642  * and that's what we'll do for e.g. user attributes that haven't been set.
3643  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3644  * attributes in kernel-managed attribute namespaces. */
3645 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3646                 size_t buflen)
3647 {
3648         struct inode *inode = dentry->d_inode;
3649
3650         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3651                 return -EOPNOTSUPP;
3652
3653         return nfs4_proc_get_acl(inode, buf, buflen);
3654 }
3655
3656 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3657 {
3658         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3659
3660         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3661                 return 0;
3662         if (buf && buflen < len)
3663                 return -ERANGE;
3664         if (buf)
3665                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3666         return len;
3667 }
3668
3669 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3670                 struct nfs4_fs_locations *fs_locations, struct page *page)
3671 {
3672         struct nfs_server *server = NFS_SERVER(dir);
3673         u32 bitmask[2] = {
3674                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3675                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3676         };
3677         struct nfs4_fs_locations_arg args = {
3678                 .dir_fh = NFS_FH(dir),
3679                 .name = &dentry->d_name,
3680                 .page = page,
3681                 .bitmask = bitmask,
3682         };
3683         struct rpc_message msg = {
3684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3685                 .rpc_argp = &args,
3686                 .rpc_resp = fs_locations,
3687         };
3688         int status;
3689
3690         dprintk("%s: start\n", __FUNCTION__);
3691         fs_locations->fattr.valid = 0;
3692         fs_locations->server = server;
3693         fs_locations->nlocations = 0;
3694         status = rpc_call_sync(server->client, &msg, 0);
3695         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3696         return status;
3697 }
3698
3699 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3700         .recover_open   = nfs4_open_reclaim,
3701         .recover_lock   = nfs4_lock_reclaim,
3702 };
3703
3704 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3705         .recover_open   = nfs4_open_expired,
3706         .recover_lock   = nfs4_lock_expired,
3707 };
3708
3709 static struct inode_operations nfs4_file_inode_operations = {
3710         .permission     = nfs_permission,
3711         .getattr        = nfs_getattr,
3712         .setattr        = nfs_setattr,
3713         .getxattr       = nfs4_getxattr,
3714         .setxattr       = nfs4_setxattr,
3715         .listxattr      = nfs4_listxattr,
3716 };
3717
3718 struct nfs_rpc_ops      nfs_v4_clientops = {
3719         .version        = 4,                    /* protocol version */
3720         .dentry_ops     = &nfs4_dentry_operations,
3721         .dir_inode_ops  = &nfs4_dir_inode_operations,
3722         .file_inode_ops = &nfs4_file_inode_operations,
3723         .getroot        = nfs4_proc_get_root,
3724         .getattr        = nfs4_proc_getattr,
3725         .setattr        = nfs4_proc_setattr,
3726         .lookup         = nfs4_proc_lookup,
3727         .access         = nfs4_proc_access,
3728         .readlink       = nfs4_proc_readlink,
3729         .read           = nfs4_proc_read,
3730         .write          = nfs4_proc_write,
3731         .commit         = nfs4_proc_commit,
3732         .create         = nfs4_proc_create,
3733         .remove         = nfs4_proc_remove,
3734         .unlink_setup   = nfs4_proc_unlink_setup,
3735         .unlink_done    = nfs4_proc_unlink_done,
3736         .rename         = nfs4_proc_rename,
3737         .link           = nfs4_proc_link,
3738         .symlink        = nfs4_proc_symlink,
3739         .mkdir          = nfs4_proc_mkdir,
3740         .rmdir          = nfs4_proc_remove,
3741         .readdir        = nfs4_proc_readdir,
3742         .mknod          = nfs4_proc_mknod,
3743         .statfs         = nfs4_proc_statfs,
3744         .fsinfo         = nfs4_proc_fsinfo,
3745         .pathconf       = nfs4_proc_pathconf,
3746         .decode_dirent  = nfs4_decode_dirent,
3747         .read_setup     = nfs4_proc_read_setup,
3748         .read_done      = nfs4_read_done,
3749         .write_setup    = nfs4_proc_write_setup,
3750         .write_done     = nfs4_write_done,
3751         .commit_setup   = nfs4_proc_commit_setup,
3752         .commit_done    = nfs4_commit_done,
3753         .file_open      = nfs_open,
3754         .file_release   = nfs_release,
3755         .lock           = nfs4_proc_lock,
3756         .clear_acl_cache = nfs4_zap_acl_attr,
3757 };
3758
3759 /*
3760  * Local variables:
3761  *  c-basic-offset: 8
3762  * End:
3763  */