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   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
  61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  66 extern struct rpc_procinfo nfs4_procedures[];
  67
  68 /* Prevent leaks of NFSv4 errors into userland */
  69 int nfs4_map_errors(int err)
  70 {
  71         if (err < -1000) {
  72                 dprintk("%s could not handle NFSv4 error %d\n",
  73                                 __FUNCTION__, -err);
  74                 return -EIO;
  75         }
  76         return err;
  77 }
  78
  79 /*
  80  * This is our standard bitmap for GETATTR requests.
  81  */
  82 const u32 nfs4_fattr_bitmap[2] = {
  83         FATTR4_WORD0_TYPE
  84         | FATTR4_WORD0_CHANGE
  85         | FATTR4_WORD0_SIZE
  86         | FATTR4_WORD0_FSID
  87         | FATTR4_WORD0_FILEID,
  88         FATTR4_WORD1_MODE
  89         | FATTR4_WORD1_NUMLINKS
  90         | FATTR4_WORD1_OWNER
  91         | FATTR4_WORD1_OWNER_GROUP
  92         | FATTR4_WORD1_RAWDEV
  93         | FATTR4_WORD1_SPACE_USED
  94         | FATTR4_WORD1_TIME_ACCESS
  95         | FATTR4_WORD1_TIME_METADATA
  96         | FATTR4_WORD1_TIME_MODIFY
  97 };
  98
  99 const u32 nfs4_statfs_bitmap[2] = {
 100         FATTR4_WORD0_FILES_AVAIL
 101         | FATTR4_WORD0_FILES_FREE
 102         | FATTR4_WORD0_FILES_TOTAL,
 103         FATTR4_WORD1_SPACE_AVAIL
 104         | FATTR4_WORD1_SPACE_FREE
 105         | FATTR4_WORD1_SPACE_TOTAL
 106 };
 107
 108 const u32 nfs4_pathconf_bitmap[2] = {
 109         FATTR4_WORD0_MAXLINK
 110         | FATTR4_WORD0_MAXNAME,
 111         0
 112 };
 113
 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 115                         | FATTR4_WORD0_MAXREAD
 116                         | FATTR4_WORD0_MAXWRITE
 117                         | FATTR4_WORD0_LEASE_TIME,
 118                         0
 119 };
 120
 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 122                 struct nfs4_readdir_arg *readdir)
 123 {
 124         u32 *start, *p;
 125
 126         BUG_ON(readdir->count < 80);
 127         if (cookie > 2) {
 128                 readdir->cookie = cookie;
 129                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 130                 return;
 131         }
 132
 133         readdir->cookie = 0;
 134         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 135         if (cookie == 2)
 136                 return;
 137
 138         /*
 139          * NFSv4 servers do not return entries for '.' and '..'
 140          * Therefore, we fake these entries here.  We let '.'
 141          * have cookie 0 and '..' have cookie 1.  Note that
 142          * when talking to the server, we always send cookie 0
 143          * instead of 1 or 2.
 144          */
 145         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 146
 147         if (cookie == 0) {
 148                 *p++ = xdr_one;                                  /* next */
 149                 *p++ = xdr_zero;                   /* cookie, first word */
 150                 *p++ = xdr_one;                   /* cookie, second word */
 151                 *p++ = xdr_one;                             /* entry len */
 152                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 153                 p++;
 154                 *p++ = xdr_one;                         /* bitmap length */
 155                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 156                 *p++ = htonl(8);              /* attribute buffer length */
 157                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 158         }
 159
 160         *p++ = xdr_one;                                  /* next */
 161         *p++ = xdr_zero;                   /* cookie, first word */
 162         *p++ = xdr_two;                   /* cookie, second word */
 163         *p++ = xdr_two;                             /* entry len */
 164         memcpy(p, "..\0\0", 4);                         /* entry */
 165         p++;
 166         *p++ = xdr_one;                         /* bitmap length */
 167         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 168         *p++ = htonl(8);              /* attribute buffer length */
 169         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 170
 171         readdir->pgbase = (char *)p - (char *)start;
 172         readdir->count -= readdir->pgbase;
 173         kunmap_atomic(start, KM_USER0);
 174 }
 175
 176 static void
 177 renew_lease(struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         spin_lock(&inode->i_lock);
 191         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 192         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 193                 nfsi->change_attr = cinfo->after;
 194         spin_unlock(&inode->i_lock);
 195 }
 196
 197 /* Helper for asynchronous RPC calls */
 198 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 199                 rpc_action tk_exit, void *calldata)
 200 {
 201         struct rpc_task *task;
 202
 203         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 204                 return -ENOMEM;
 205
 206         task->tk_calldata = calldata;
 207         task->tk_action = tk_begin;
 208         rpc_execute(task);
 209         return 0;
 210 }
 211
 212 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 213 {
 214         struct inode *inode = state->inode;
 215
 216         open_flags &= (FMODE_READ|FMODE_WRITE);
 217         /* Protect against nfs4_find_state_byowner() */
 218         spin_lock(&state->owner->so_lock);
 219         spin_lock(&inode->i_lock);
 220         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 221         if ((open_flags & FMODE_WRITE))
 222                 state->nwriters++;
 223         if (open_flags & FMODE_READ)
 224                 state->nreaders++;
 225         nfs4_state_set_mode_locked(state, state->state | open_flags);
 226         spin_unlock(&inode->i_lock);
 227         spin_unlock(&state->owner->so_lock);
 228 }
 229
 230 /*
 231  * OPEN_RECLAIM:
 232  *      reclaim state on the server after a reboot.
 233  */
 234 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 235 {
 236         struct inode *inode = state->inode;
 237         struct nfs_server *server = NFS_SERVER(inode);
 238         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 239         struct nfs_openargs o_arg = {
 240                 .fh = NFS_FH(inode),
 241                 .id = sp->so_id,
 242                 .open_flags = state->state,
 243                 .clientid = server->nfs4_state->cl_clientid,
 244                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 245                 .bitmask = server->attr_bitmask,
 246         };
 247         struct nfs_openres o_res = {
 248                 .server = server,       /* Grrr */
 249         };
 250         struct rpc_message msg = {
 251                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 252                 .rpc_argp       = &o_arg,
 253                 .rpc_resp       = &o_res,
 254                 .rpc_cred       = sp->so_cred,
 255         };
 256         int status;
 257
 258         if (delegation != NULL) {
 259                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 260                         memcpy(&state->stateid, &delegation->stateid,
 261                                         sizeof(state->stateid));
 262                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 263                         return 0;
 264                 }
 265                 o_arg.u.delegation_type = delegation->type;
 266         }
 267         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 268         if (o_arg.seqid == NULL)
 269                 return -ENOMEM;
 270         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 271         /* Confirm the sequence as being established */
 272         nfs_confirm_seqid(&sp->so_seqid, status);
 273         nfs_increment_open_seqid(status, o_arg.seqid);
 274         if (status == 0) {
 275                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 276                 if (o_res.delegation_type != 0) {
 277                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 278                         /* Did the server issue an immediate delegation recall? */
 279                         if (o_res.do_recall)
 280                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 281                 }
 282         }
 283         nfs_free_seqid(o_arg.seqid);
 284         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 285         /* Ensure we update the inode attributes */
 286         NFS_CACHEINV(inode);
 287         return status;
 288 }
 289
 290 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 291 {
 292         struct nfs_server *server = NFS_SERVER(state->inode);
 293         struct nfs4_exception exception = { };
 294         int err;
 295         do {
 296                 err = _nfs4_open_reclaim(sp, state);
 297                 if (err != -NFS4ERR_DELAY)
 298                         break;
 299                 nfs4_handle_exception(server, err, &exception);
 300         } while (exception.retry);
 301         return err;
 302 }
 303
 304 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 305 {
 306         struct nfs4_state_owner  *sp  = state->owner;
 307         struct inode *inode = dentry->d_inode;
 308         struct nfs_server *server = NFS_SERVER(inode);
 309         struct dentry *parent = dget_parent(dentry);
 310         struct nfs_openargs arg = {
 311                 .fh = NFS_FH(parent->d_inode),
 312                 .clientid = server->nfs4_state->cl_clientid,
 313                 .name = &dentry->d_name,
 314                 .id = sp->so_id,
 315                 .server = server,
 316                 .bitmask = server->attr_bitmask,
 317                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 318         };
 319         struct nfs_openres res = {
 320                 .server = server,
 321         };
 322         struct  rpc_message msg = {
 323                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 324                 .rpc_argp       = &arg,
 325                 .rpc_resp       = &res,
 326                 .rpc_cred       = sp->so_cred,
 327         };
 328         int status = 0;
 329
 330         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 331                 goto out;
 332         if (state->state == 0)
 333                 goto out;
 334         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 335         status = -ENOMEM;
 336         if (arg.seqid == NULL)
 337                 goto out;
 338         arg.open_flags = state->state;
 339         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 340         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 341         nfs_increment_open_seqid(status, arg.seqid);
 342         if (status != 0)
 343                 goto out_free;
 344         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 345                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 346                                 sp, &res.stateid, arg.seqid);
 347                 if (status != 0)
 348                         goto out_free;
 349         }
 350         nfs_confirm_seqid(&sp->so_seqid, 0);
 351         if (status >= 0) {
 352                 memcpy(state->stateid.data, res.stateid.data,
 353                                 sizeof(state->stateid.data));
 354                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 355         }
 356 out_free:
 357         nfs_free_seqid(arg.seqid);
 358 out:
 359         dput(parent);
 360         return status;
 361 }
 362
 363 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 364 {
 365         struct nfs4_exception exception = { };
 366         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 367         int err;
 368         do {
 369                 err = _nfs4_open_delegation_recall(dentry, state);
 370                 switch (err) {
 371                         case 0:
 372                                 return err;
 373                         case -NFS4ERR_STALE_CLIENTID:
 374                         case -NFS4ERR_STALE_STATEID:
 375                         case -NFS4ERR_EXPIRED:
 376                                 /* Don't recall a delegation if it was lost */
 377                                 nfs4_schedule_state_recovery(server->nfs4_state);
 378                                 return err;
 379                 }
 380                 err = nfs4_handle_exception(server, err, &exception);
 381         } while (exception.retry);
 382         return err;
 383 }
 384
 385 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
 386 {
 387         struct nfs_open_confirmargs arg = {
 388                 .fh             = fh,
 389                 .seqid          = seqid,
 390                 .stateid        = *stateid,
 391         };
 392         struct nfs_open_confirmres res;
 393         struct  rpc_message msg = {
 394                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 395                 .rpc_argp       = &arg,
 396                 .rpc_resp       = &res,
 397                 .rpc_cred       = sp->so_cred,
 398         };
 399         int status;
 400
 401         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 402         /* Confirm the sequence as being established */
 403         nfs_confirm_seqid(&sp->so_seqid, status);
 404         nfs_increment_open_seqid(status, seqid);
 405         if (status >= 0)
 406                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 407         return status;
 408 }
 409
 410 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 411 {
 412         struct nfs_server *server = NFS_SERVER(dir);
 413         struct rpc_message msg = {
 414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 415                 .rpc_argp = o_arg,
 416                 .rpc_resp = o_res,
 417                 .rpc_cred = sp->so_cred,
 418         };
 419         int status;
 420
 421         /* Update sequence id. The caller must serialize! */
 422         o_arg->id = sp->so_id;
 423         o_arg->clientid = sp->so_client->cl_clientid;
 424
 425         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 426         if (status == 0) {
 427                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 428                 switch (o_res->f_attr->mode & S_IFMT) {
 429                         case S_IFREG:
 430                                 break;
 431                         case S_IFLNK:
 432                                 status = -ELOOP;
 433                                 break;
 434                         case S_IFDIR:
 435                                 status = -EISDIR;
 436                                 break;
 437                         default:
 438                                 status = -ENOTDIR;
 439                 }
 440         }
 441
 442         nfs_increment_open_seqid(status, o_arg->seqid);
 443         if (status != 0)
 444                 goto out;
 445         if (o_arg->open_flags & O_CREAT) {
 446                 update_changeattr(dir, &o_res->cinfo);
 447                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 448         } else
 449                 nfs_refresh_inode(dir, o_res->dir_attr);
 450         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 451                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 452                                 sp, &o_res->stateid, o_arg->seqid);
 453                 if (status != 0)
 454                         goto out;
 455         }
 456         nfs_confirm_seqid(&sp->so_seqid, 0);
 457         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 458                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 459 out:
 460         return status;
 461 }
 462
 463 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 464 {
 465         struct nfs_access_entry cache;
 466         int mask = 0;
 467         int status;
 468
 469         if (openflags & FMODE_READ)
 470                 mask |= MAY_READ;
 471         if (openflags & FMODE_WRITE)
 472                 mask |= MAY_WRITE;
 473         status = nfs_access_get_cached(inode, cred, &cache);
 474         if (status == 0)
 475                 goto out;
 476
 477         /* Be clever: ask server to check for all possible rights */
 478         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 479         cache.cred = cred;
 480         cache.jiffies = jiffies;
 481         status = _nfs4_proc_access(inode, &cache);
 482         if (status != 0)
 483                 return status;
 484         nfs_access_add_cache(inode, &cache);
 485 out:
 486         if ((cache.mask & mask) == mask)
 487                 return 0;
 488         return -EACCES;
 489 }
 490
 491 /*
 492  * OPEN_EXPIRED:
 493  *      reclaim state on the server after a network partition.
 494  *      Assumes caller holds the appropriate lock
 495  */
 496 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 497 {
 498         struct dentry *parent = dget_parent(dentry);
 499         struct inode *dir = parent->d_inode;
 500         struct inode *inode = state->inode;
 501         struct nfs_server *server = NFS_SERVER(dir);
 502         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 503         struct nfs_fattr f_attr, dir_attr;
 504         struct nfs_openargs o_arg = {
 505                 .fh = NFS_FH(dir),
 506                 .open_flags = state->state,
 507                 .name = &dentry->d_name,
 508                 .bitmask = server->attr_bitmask,
 509                 .claim = NFS4_OPEN_CLAIM_NULL,
 510         };
 511         struct nfs_openres o_res = {
 512                 .f_attr = &f_attr,
 513                 .dir_attr = &dir_attr,
 514                 .server = server,
 515         };
 516         int status = 0;
 517
 518         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 519                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 520                 if (status < 0)
 521                         goto out;
 522                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 523                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 524                 goto out;
 525         }
 526         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 527         status = -ENOMEM;
 528         if (o_arg.seqid == NULL)
 529                 goto out;
 530         nfs_fattr_init(&f_attr);
 531         nfs_fattr_init(&dir_attr);
 532         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 533         if (status != 0)
 534                 goto out_nodeleg;
 535         /* Check if files differ */
 536         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 537                 goto out_stale;
 538         /* Has the file handle changed? */
 539         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 540                 /* Verify if the change attributes are the same */
 541                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 542                         goto out_stale;
 543                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 544                         goto out_stale;
 545                 /* Lets just pretend that this is the same file */
 546                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 547                 NFS_I(inode)->fileid = f_attr.fileid;
 548         }
 549         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 550         if (o_res.delegation_type != 0) {
 551                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 552                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 553                 else
 554                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 555         }
 556 out_nodeleg:
 557         nfs_free_seqid(o_arg.seqid);
 558         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 559 out:
 560         dput(parent);
 561         return status;
 562 out_stale:
 563         status = -ESTALE;
 564         /* Invalidate the state owner so we don't ever use it again */
 565         nfs4_drop_state_owner(sp);
 566         d_drop(dentry);
 567         /* Should we be trying to close that stateid? */
 568         goto out_nodeleg;
 569 }
 570
 571 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 572 {
 573         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 574         struct nfs4_exception exception = { };
 575         int err;
 576
 577         do {
 578                 err = _nfs4_open_expired(sp, state, dentry);
 579                 if (err == -NFS4ERR_DELAY)
 580                         nfs4_handle_exception(server, err, &exception);
 581         } while (exception.retry);
 582         return err;
 583 }
 584
 585 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 586 {
 587         struct nfs_inode *nfsi = NFS_I(state->inode);
 588         struct nfs_open_context *ctx;
 589         int status;
 590
 591         spin_lock(&state->inode->i_lock);
 592         list_for_each_entry(ctx, &nfsi->open_files, list) {
 593                 if (ctx->state != state)
 594                         continue;
 595                 get_nfs_open_context(ctx);
 596                 spin_unlock(&state->inode->i_lock);
 597                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 598                 put_nfs_open_context(ctx);
 599                 return status;
 600         }
 601         spin_unlock(&state->inode->i_lock);
 602         return -ENOENT;
 603 }
 604
 605 /*
 606  * Returns an nfs4_state + an extra reference to the inode
 607  */
 608 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 609 {
 610         struct nfs_delegation *delegation;
 611         struct nfs_server *server = NFS_SERVER(inode);
 612         struct nfs4_client *clp = server->nfs4_state;
 613         struct nfs_inode *nfsi = NFS_I(inode);
 614         struct nfs4_state_owner *sp = NULL;
 615         struct nfs4_state *state = NULL;
 616         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 617         int err;
 618
 619         /* Protect against reboot recovery - NOTE ORDER! */
 620         down_read(&clp->cl_sem);
 621         /* Protect against delegation recall */
 622         down_read(&nfsi->rwsem);
 623         delegation = NFS_I(inode)->delegation;
 624         err = -ENOENT;
 625         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 626                 goto out_err;
 627         err = -ENOMEM;
 628         if (!(sp = nfs4_get_state_owner(server, cred))) {
 629                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 630                 goto out_err;
 631         }
 632         state = nfs4_get_open_state(inode, sp);
 633         if (state == NULL)
 634                 goto out_err;
 635
 636         err = -ENOENT;
 637         if ((state->state & open_flags) == open_flags) {
 638                 spin_lock(&inode->i_lock);
 639                 if (open_flags & FMODE_READ)
 640                         state->nreaders++;
 641                 if (open_flags & FMODE_WRITE)
 642                         state->nwriters++;
 643                 spin_unlock(&inode->i_lock);
 644                 goto out_ok;
 645         } else if (state->state != 0)
 646                 goto out_err;
 647
 648         lock_kernel();
 649         err = _nfs4_do_access(inode, cred, open_flags);
 650         unlock_kernel();
 651         if (err != 0)
 652                 goto out_err;
 653         set_bit(NFS_DELEGATED_STATE, &state->flags);
 654         update_open_stateid(state, &delegation->stateid, open_flags);
 655 out_ok:
 656         nfs4_put_state_owner(sp);
 657         up_read(&nfsi->rwsem);
 658         up_read(&clp->cl_sem);
 659         igrab(inode);
 660         *res = state;
 661         return 0;
 662 out_err:
 663         if (sp != NULL) {
 664                 if (state != NULL)
 665                         nfs4_put_open_state(state);
 666                 nfs4_put_state_owner(sp);
 667         }
 668         up_read(&nfsi->rwsem);
 669         up_read(&clp->cl_sem);
 670         if (err != -EACCES)
 671                 nfs_inode_return_delegation(inode);
 672         return err;
 673 }
 674
 675 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 676 {
 677         struct nfs4_exception exception = { };
 678         struct nfs4_state *res;
 679         int err;
 680
 681         do {
 682                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 683                 if (err == 0)
 684                         break;
 685                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 686                                         err, &exception));
 687         } while (exception.retry);
 688         return res;
 689 }
 690
 691 /*
 692  * Returns an nfs4_state + an referenced inode
 693  */
 694 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 695 {
 696         struct nfs4_state_owner  *sp;
 697         struct nfs4_state     *state = NULL;
 698         struct nfs_server       *server = NFS_SERVER(dir);
 699         struct nfs4_client *clp = server->nfs4_state;
 700         struct inode *inode = NULL;
 701         int                     status;
 702         struct nfs_fattr f_attr, dir_attr;
 703         struct nfs_openargs o_arg = {
 704                 .fh             = NFS_FH(dir),
 705                 .open_flags     = flags,
 706                 .name           = &dentry->d_name,
 707                 .server         = server,
 708                 .bitmask = server->attr_bitmask,
 709                 .claim = NFS4_OPEN_CLAIM_NULL,
 710         };
 711         struct nfs_openres o_res = {
 712                 .f_attr         = &f_attr,
 713                 .dir_attr       = &dir_attr,
 714                 .server         = server,
 715         };
 716
 717         /* Protect against reboot recovery conflicts */
 718         down_read(&clp->cl_sem);
 719         status = -ENOMEM;
 720         if (!(sp = nfs4_get_state_owner(server, cred))) {
 721                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 722                 goto out_err;
 723         }
 724         if (flags & O_EXCL) {
 725                 u32 *p = (u32 *) o_arg.u.verifier.data;
 726                 p[0] = jiffies;
 727                 p[1] = current->pid;
 728         } else
 729                 o_arg.u.attrs = sattr;
 730         /* Serialization for the sequence id */
 731
 732         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 733         if (o_arg.seqid == NULL)
 734                 return -ENOMEM;
 735         nfs_fattr_init(&f_attr);
 736         nfs_fattr_init(&dir_attr);
 737         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 738         if (status != 0)
 739                 goto out_err;
 740
 741         status = -ENOMEM;
 742         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 743         if (!inode)
 744                 goto out_err;
 745         state = nfs4_get_open_state(inode, sp);
 746         if (!state)
 747                 goto out_err;
 748         update_open_stateid(state, &o_res.stateid, flags);
 749         if (o_res.delegation_type != 0)
 750                 nfs_inode_set_delegation(inode, cred, &o_res);
 751         nfs_free_seqid(o_arg.seqid);
 752         nfs4_put_state_owner(sp);
 753         up_read(&clp->cl_sem);
 754         *res = state;
 755         return 0;
 756 out_err:
 757         if (sp != NULL) {
 758                 if (state != NULL)
 759                         nfs4_put_open_state(state);
 760                 nfs_free_seqid(o_arg.seqid);
 761                 nfs4_put_state_owner(sp);
 762         }
 763         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 764         up_read(&clp->cl_sem);
 765         if (inode != NULL)
 766                 iput(inode);
 767         *res = NULL;
 768         return status;
 769 }
 770
 771
 772 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 773 {
 774         struct nfs4_exception exception = { };
 775         struct nfs4_state *res;
 776         int status;
 777
 778         do {
 779                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 780                 if (status == 0)
 781                         break;
 782                 /* NOTE: BAD_SEQID means the server and client disagree about the
 783                  * book-keeping w.r.t. state-changing operations
 784                  * (OPEN/CLOSE/LOCK/LOCKU...)
 785                  * It is actually a sign of a bug on the client or on the server.
 786                  *
 787                  * If we receive a BAD_SEQID error in the particular case of
 788                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 789                  * have unhashed the old state_owner for us, and that we can
 790                  * therefore safely retry using a new one. We should still warn
 791                  * the user though...
 792                  */
 793                 if (status == -NFS4ERR_BAD_SEQID) {
 794                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 795                         exception.retry = 1;
 796                         continue;
 797                 }
 798                 /*
 799                  * BAD_STATEID on OPEN means that the server cancelled our
 800                  * state before it received the OPEN_CONFIRM.
 801                  * Recover by retrying the request as per the discussion
 802                  * on Page 181 of RFC3530.
 803                  */
 804                 if (status == -NFS4ERR_BAD_STATEID) {
 805                         exception.retry = 1;
 806                         continue;
 807                 }
 808                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 809                                         status, &exception));
 810         } while (exception.retry);
 811         return res;
 812 }
 813
 814 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 815                 struct nfs_fh *fhandle, struct iattr *sattr,
 816                 struct nfs4_state *state)
 817 {
 818         struct nfs_setattrargs  arg = {
 819                 .fh             = fhandle,
 820                 .iap            = sattr,
 821                 .server         = server,
 822                 .bitmask = server->attr_bitmask,
 823         };
 824         struct nfs_setattrres  res = {
 825                 .fattr          = fattr,
 826                 .server         = server,
 827         };
 828         struct rpc_message msg = {
 829                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 830                 .rpc_argp       = &arg,
 831                 .rpc_resp       = &res,
 832         };
 833         int status;
 834
 835         nfs_fattr_init(fattr);
 836
 837         if (state != NULL) {
 838                 msg.rpc_cred = state->owner->so_cred;
 839                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 840         } else
 841                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 842
 843         status = rpc_call_sync(server->client, &msg, 0);
 844         return status;
 845 }
 846
 847 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 848                 struct nfs_fh *fhandle, struct iattr *sattr,
 849                 struct nfs4_state *state)
 850 {
 851         struct nfs4_exception exception = { };
 852         int err;
 853         do {
 854                 err = nfs4_handle_exception(server,
 855                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 856                                         state),
 857                                 &exception);
 858         } while (exception.retry);
 859         return err;
 860 }
 861
 862 struct nfs4_closedata {
 863         struct inode *inode;
 864         struct nfs4_state *state;
 865         struct nfs_closeargs arg;
 866         struct nfs_closeres res;
 867         struct nfs_fattr fattr;
 868 };
 869
 870 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 871 {
 872         struct nfs4_state *state = calldata->state;
 873         struct nfs4_state_owner *sp = state->owner;
 874
 875         nfs4_put_open_state(calldata->state);
 876         nfs_free_seqid(calldata->arg.seqid);
 877         nfs4_put_state_owner(sp);
 878         kfree(calldata);
 879 }
 880
 881 static void nfs4_close_done(struct rpc_task *task)
 882 {
 883         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 884         struct nfs4_state *state = calldata->state;
 885         struct nfs_server *server = NFS_SERVER(calldata->inode);
 886
 887         /* hmm. we are done with the inode, and in the process of freeing
 888          * the state_owner. we keep this around to process errors
 889          */
 890         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 891         switch (task->tk_status) {
 892                 case 0:
 893                         memcpy(&state->stateid, &calldata->res.stateid,
 894                                         sizeof(state->stateid));
 895                         break;
 896                 case -NFS4ERR_STALE_STATEID:
 897                 case -NFS4ERR_EXPIRED:
 898                         nfs4_schedule_state_recovery(server->nfs4_state);
 899                         break;
 900                 default:
 901                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 902                                 rpc_restart_call(task);
 903                                 return;
 904                         }
 905         }
 906         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
 907         nfs4_free_closedata(calldata);
 908 }
 909
 910 static void nfs4_close_begin(struct rpc_task *task)
 911 {
 912         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 913         struct nfs4_state *state = calldata->state;
 914         struct rpc_message msg = {
 915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 916                 .rpc_argp = &calldata->arg,
 917                 .rpc_resp = &calldata->res,
 918                 .rpc_cred = state->owner->so_cred,
 919         };
 920         int mode = 0, old_mode;
 921         int status;
 922
 923         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 924         if (status != 0)
 925                 return;
 926         /* Recalculate the new open mode in case someone reopened the file
 927          * while we were waiting in line to be scheduled.
 928          */
 929         spin_lock(&state->owner->so_lock);
 930         spin_lock(&calldata->inode->i_lock);
 931         mode = old_mode = state->state;
 932         if (state->nreaders == 0)
 933                 mode &= ~FMODE_READ;
 934         if (state->nwriters == 0)
 935                 mode &= ~FMODE_WRITE;
 936         nfs4_state_set_mode_locked(state, mode);
 937         spin_unlock(&calldata->inode->i_lock);
 938         spin_unlock(&state->owner->so_lock);
 939         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
 940                 nfs4_free_closedata(calldata);
 941                 task->tk_exit = NULL;
 942                 rpc_exit(task, 0);
 943                 return;
 944         }
 945         nfs_fattr_init(calldata->res.fattr);
 946         if (mode != 0)
 947                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 948         calldata->arg.open_flags = mode;
 949         rpc_call_setup(task, &msg, 0);
 950 }
 951
 952 /*
 953  * It is possible for data to be read/written from a mem-mapped file
 954  * after the sys_close call (which hits the vfs layer as a flush).
 955  * This means that we can't safely call nfsv4 close on a file until
 956  * the inode is cleared. This in turn means that we are not good
 957  * NFSv4 citizens - we do not indicate to the server to update the file's
 958  * share state even when we are done with one of the three share
 959  * stateid's in the inode.
 960  *
 961  * NOTE: Caller must be holding the sp->so_owner semaphore!
 962  */
 963 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
 964 {
 965         struct nfs_server *server = NFS_SERVER(inode);
 966         struct nfs4_closedata *calldata;
 967         int status = -ENOMEM;
 968
 969         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 970         if (calldata == NULL)
 971                 goto out;
 972         calldata->inode = inode;
 973         calldata->state = state;
 974         calldata->arg.fh = NFS_FH(inode);
 975         calldata->arg.stateid = &state->stateid;
 976         /* Serialization for the sequence id */
 977         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 978         if (calldata->arg.seqid == NULL)
 979                 goto out_free_calldata;
 980         calldata->arg.bitmask = server->attr_bitmask;
 981         calldata->res.fattr = &calldata->fattr;
 982         calldata->res.server = server;
 983
 984         status = nfs4_call_async(server->client, nfs4_close_begin,
 985                         nfs4_close_done, calldata);
 986         if (status == 0)
 987                 goto out;
 988
 989         nfs_free_seqid(calldata->arg.seqid);
 990 out_free_calldata:
 991         kfree(calldata);
 992 out:
 993         return status;
 994 }
 995
 996 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 997 {
 998         struct file *filp;
 999
1000         filp = lookup_instantiate_filp(nd, dentry, NULL);
1001         if (!IS_ERR(filp)) {
1002                 struct nfs_open_context *ctx;
1003                 ctx = (struct nfs_open_context *)filp->private_data;
1004                 ctx->state = state;
1005         } else
1006                 nfs4_close_state(state, nd->intent.open.flags);
1007 }
1008
1009 struct dentry *
1010 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1011 {
1012         struct iattr attr;
1013         struct rpc_cred *cred;
1014         struct nfs4_state *state;
1015         struct dentry *res;
1016
1017         if (nd->flags & LOOKUP_CREATE) {
1018                 attr.ia_mode = nd->intent.open.create_mode;
1019                 attr.ia_valid = ATTR_MODE;
1020                 if (!IS_POSIXACL(dir))
1021                         attr.ia_mode &= ~current->fs->umask;
1022         } else {
1023                 attr.ia_valid = 0;
1024                 BUG_ON(nd->intent.open.flags & O_CREAT);
1025         }
1026
1027         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1028         if (IS_ERR(cred))
1029                 return (struct dentry *)cred;
1030         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1031         put_rpccred(cred);
1032         if (IS_ERR(state)) {
1033                 if (PTR_ERR(state) == -ENOENT)
1034                         d_add(dentry, NULL);
1035                 return (struct dentry *)state;
1036         }
1037         res = d_add_unique(dentry, state->inode);
1038         if (res != NULL)
1039                 dentry = res;
1040         nfs4_intent_set_file(nd, dentry, state);
1041         return res;
1042 }
1043
1044 int
1045 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1046 {
1047         struct rpc_cred *cred;
1048         struct nfs4_state *state;
1049         struct inode *inode;
1050
1051         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1052         if (IS_ERR(cred))
1053                 return PTR_ERR(cred);
1054         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1055         if (IS_ERR(state))
1056                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1057         put_rpccred(cred);
1058         if (IS_ERR(state)) {
1059                 switch (PTR_ERR(state)) {
1060                         case -EPERM:
1061                         case -EACCES:
1062                         case -EDQUOT:
1063                         case -ENOSPC:
1064                         case -EROFS:
1065                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1066                                 return 1;
1067                         case -ENOENT:
1068                                 if (dentry->d_inode == NULL)
1069                                         return 1;
1070                 }
1071                 goto out_drop;
1072         }
1073         inode = state->inode;
1074         iput(inode);
1075         if (inode == dentry->d_inode) {
1076                 nfs4_intent_set_file(nd, dentry, state);
1077                 return 1;
1078         }
1079         nfs4_close_state(state, openflags);
1080 out_drop:
1081         d_drop(dentry);
1082         return 0;
1083 }
1084
1085
1086 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1087 {
1088         struct nfs4_server_caps_res res = {};
1089         struct rpc_message msg = {
1090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1091                 .rpc_argp = fhandle,
1092                 .rpc_resp = &res,
1093         };
1094         int status;
1095
1096         status = rpc_call_sync(server->client, &msg, 0);
1097         if (status == 0) {
1098                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1099                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1100                         server->caps |= NFS_CAP_ACLS;
1101                 if (res.has_links != 0)
1102                         server->caps |= NFS_CAP_HARDLINKS;
1103                 if (res.has_symlinks != 0)
1104                         server->caps |= NFS_CAP_SYMLINKS;
1105                 server->acl_bitmask = res.acl_bitmask;
1106         }
1107         return status;
1108 }
1109
1110 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1111 {
1112         struct nfs4_exception exception = { };
1113         int err;
1114         do {
1115                 err = nfs4_handle_exception(server,
1116                                 _nfs4_server_capabilities(server, fhandle),
1117                                 &exception);
1118         } while (exception.retry);
1119         return err;
1120 }
1121
1122 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1123                 struct nfs_fsinfo *info)
1124 {
1125         struct nfs4_lookup_root_arg args = {
1126                 .bitmask = nfs4_fattr_bitmap,
1127         };
1128         struct nfs4_lookup_res res = {
1129                 .server = server,
1130                 .fattr = info->fattr,
1131                 .fh = fhandle,
1132         };
1133         struct rpc_message msg = {
1134                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1135                 .rpc_argp = &args,
1136                 .rpc_resp = &res,
1137         };
1138         nfs_fattr_init(info->fattr);
1139         return rpc_call_sync(server->client, &msg, 0);
1140 }
1141
1142 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1143                 struct nfs_fsinfo *info)
1144 {
1145         struct nfs4_exception exception = { };
1146         int err;
1147         do {
1148                 err = nfs4_handle_exception(server,
1149                                 _nfs4_lookup_root(server, fhandle, info),
1150                                 &exception);
1151         } while (exception.retry);
1152         return err;
1153 }
1154
1155 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1156                 struct nfs_fsinfo *info)
1157 {
1158         struct nfs_fattr *      fattr = info->fattr;
1159         unsigned char *         p;
1160         struct qstr             q;
1161         struct nfs4_lookup_arg args = {
1162                 .dir_fh = fhandle,
1163                 .name = &q,
1164                 .bitmask = nfs4_fattr_bitmap,
1165         };
1166         struct nfs4_lookup_res res = {
1167                 .server = server,
1168                 .fattr = fattr,
1169                 .fh = fhandle,
1170         };
1171         struct rpc_message msg = {
1172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1173                 .rpc_argp = &args,
1174                 .rpc_resp = &res,
1175         };
1176         int status;
1177
1178         /*
1179          * Now we do a separate LOOKUP for each component of the mount path.
1180          * The LOOKUPs are done separately so that we can conveniently
1181          * catch an ERR_WRONGSEC if it occurs along the way...
1182          */
1183         status = nfs4_lookup_root(server, fhandle, info);
1184         if (status)
1185                 goto out;
1186
1187         p = server->mnt_path;
1188         for (;;) {
1189                 struct nfs4_exception exception = { };
1190
1191                 while (*p == '/')
1192                         p++;
1193                 if (!*p)
1194                         break;
1195                 q.name = p;
1196                 while (*p && (*p != '/'))
1197                         p++;
1198                 q.len = p - q.name;
1199
1200                 do {
1201                         nfs_fattr_init(fattr);
1202                         status = nfs4_handle_exception(server,
1203                                         rpc_call_sync(server->client, &msg, 0),
1204                                         &exception);
1205                 } while (exception.retry);
1206                 if (status == 0)
1207                         continue;
1208                 if (status == -ENOENT) {
1209                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1210                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1211                 }
1212                 break;
1213         }
1214         if (status == 0)
1215                 status = nfs4_server_capabilities(server, fhandle);
1216         if (status == 0)
1217                 status = nfs4_do_fsinfo(server, fhandle, info);
1218 out:
1219         return status;
1220 }
1221
1222 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1223 {
1224         struct nfs4_getattr_arg args = {
1225                 .fh = fhandle,
1226                 .bitmask = server->attr_bitmask,
1227         };
1228         struct nfs4_getattr_res res = {
1229                 .fattr = fattr,
1230                 .server = server,
1231         };
1232         struct rpc_message msg = {
1233                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1234                 .rpc_argp = &args,
1235                 .rpc_resp = &res,
1236         };
1237
1238         nfs_fattr_init(fattr);
1239         return rpc_call_sync(server->client, &msg, 0);
1240 }
1241
1242 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1243 {
1244         struct nfs4_exception exception = { };
1245         int err;
1246         do {
1247                 err = nfs4_handle_exception(server,
1248                                 _nfs4_proc_getattr(server, fhandle, fattr),
1249                                 &exception);
1250         } while (exception.retry);
1251         return err;
1252 }
1253
1254 /*
1255  * The file is not closed if it is opened due to the a request to change
1256  * the size of the file. The open call will not be needed once the
1257  * VFS layer lookup-intents are implemented.
1258  *
1259  * Close is called when the inode is destroyed.
1260  * If we haven't opened the file for O_WRONLY, we
1261  * need to in the size_change case to obtain a stateid.
1262  *
1263  * Got race?
1264  * Because OPEN is always done by name in nfsv4, it is
1265  * possible that we opened a different file by the same
1266  * name.  We can recognize this race condition, but we
1267  * can't do anything about it besides returning an error.
1268  *
1269  * This will be fixed with VFS changes (lookup-intent).
1270  */
1271 static int
1272 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1273                   struct iattr *sattr)
1274 {
1275         struct rpc_cred *cred;
1276         struct inode *inode = dentry->d_inode;
1277         struct nfs_open_context *ctx;
1278         struct nfs4_state *state = NULL;
1279         int status;
1280
1281         nfs_fattr_init(fattr);
1282
1283         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1284         if (IS_ERR(cred))
1285                 return PTR_ERR(cred);
1286
1287         /* Search for an existing open(O_WRITE) file */
1288         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1289         if (ctx != NULL)
1290                 state = ctx->state;
1291
1292         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1293                         NFS_FH(inode), sattr, state);
1294         if (status == 0)
1295                 nfs_setattr_update_inode(inode, sattr);
1296         if (ctx != NULL)
1297                 put_nfs_open_context(ctx);
1298         put_rpccred(cred);
1299         return status;
1300 }
1301
1302 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1303                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1304 {
1305         int                    status;
1306         struct nfs_server *server = NFS_SERVER(dir);
1307         struct nfs4_lookup_arg args = {
1308                 .bitmask = server->attr_bitmask,
1309                 .dir_fh = NFS_FH(dir),
1310                 .name = name,
1311         };
1312         struct nfs4_lookup_res res = {
1313                 .server = server,
1314                 .fattr = fattr,
1315                 .fh = fhandle,
1316         };
1317         struct rpc_message msg = {
1318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1319                 .rpc_argp = &args,
1320                 .rpc_resp = &res,
1321         };
1322
1323         nfs_fattr_init(fattr);
1324
1325         dprintk("NFS call  lookup %s\n", name->name);
1326         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1327         dprintk("NFS reply lookup: %d\n", status);
1328         return status;
1329 }
1330
1331 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1332 {
1333         struct nfs4_exception exception = { };
1334         int err;
1335         do {
1336                 err = nfs4_handle_exception(NFS_SERVER(dir),
1337                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1338                                 &exception);
1339         } while (exception.retry);
1340         return err;
1341 }
1342
1343 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1344 {
1345         struct nfs4_accessargs args = {
1346                 .fh = NFS_FH(inode),
1347         };
1348         struct nfs4_accessres res = { 0 };
1349         struct rpc_message msg = {
1350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1351                 .rpc_argp = &args,
1352                 .rpc_resp = &res,
1353                 .rpc_cred = entry->cred,
1354         };
1355         int mode = entry->mask;
1356         int status;
1357
1358         /*
1359          * Determine which access bits we want to ask for...
1360          */
1361         if (mode & MAY_READ)
1362                 args.access |= NFS4_ACCESS_READ;
1363         if (S_ISDIR(inode->i_mode)) {
1364                 if (mode & MAY_WRITE)
1365                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1366                 if (mode & MAY_EXEC)
1367                         args.access |= NFS4_ACCESS_LOOKUP;
1368         } else {
1369                 if (mode & MAY_WRITE)
1370                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1371                 if (mode & MAY_EXEC)
1372                         args.access |= NFS4_ACCESS_EXECUTE;
1373         }
1374         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1375         if (!status) {
1376                 entry->mask = 0;
1377                 if (res.access & NFS4_ACCESS_READ)
1378                         entry->mask |= MAY_READ;
1379                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1380                         entry->mask |= MAY_WRITE;
1381                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1382                         entry->mask |= MAY_EXEC;
1383         }
1384         return status;
1385 }
1386
1387 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1388 {
1389         struct nfs4_exception exception = { };
1390         int err;
1391         do {
1392                 err = nfs4_handle_exception(NFS_SERVER(inode),
1393                                 _nfs4_proc_access(inode, entry),
1394                                 &exception);
1395         } while (exception.retry);
1396         return err;
1397 }
1398
1399 /*
1400  * TODO: For the time being, we don't try to get any attributes
1401  * along with any of the zero-copy operations READ, READDIR,
1402  * READLINK, WRITE.
1403  *
1404  * In the case of the first three, we want to put the GETATTR
1405  * after the read-type operation -- this is because it is hard
1406  * to predict the length of a GETATTR response in v4, and thus
1407  * align the READ data correctly.  This means that the GETATTR
1408  * may end up partially falling into the page cache, and we should
1409  * shift it into the 'tail' of the xdr_buf before processing.
1410  * To do this efficiently, we need to know the total length
1411  * of data received, which doesn't seem to be available outside
1412  * of the RPC layer.
1413  *
1414  * In the case of WRITE, we also want to put the GETATTR after
1415  * the operation -- in this case because we want to make sure
1416  * we get the post-operation mtime and size.  This means that
1417  * we can't use xdr_encode_pages() as written: we need a variant
1418  * of it which would leave room in the 'tail' iovec.
1419  *
1420  * Both of these changes to the XDR layer would in fact be quite
1421  * minor, but I decided to leave them for a subsequent patch.
1422  */
1423 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1424                 unsigned int pgbase, unsigned int pglen)
1425 {
1426         struct nfs4_readlink args = {
1427                 .fh       = NFS_FH(inode),
1428                 .pgbase   = pgbase,
1429                 .pglen    = pglen,
1430                 .pages    = &page,
1431         };
1432         struct rpc_message msg = {
1433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1434                 .rpc_argp = &args,
1435                 .rpc_resp = NULL,
1436         };
1437
1438         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1439 }
1440
1441 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1442                 unsigned int pgbase, unsigned int pglen)
1443 {
1444         struct nfs4_exception exception = { };
1445         int err;
1446         do {
1447                 err = nfs4_handle_exception(NFS_SERVER(inode),
1448                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1449                                 &exception);
1450         } while (exception.retry);
1451         return err;
1452 }
1453
1454 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1455 {
1456         int flags = rdata->flags;
1457         struct inode *inode = rdata->inode;
1458         struct nfs_fattr *fattr = rdata->res.fattr;
1459         struct nfs_server *server = NFS_SERVER(inode);
1460         struct rpc_message msg = {
1461                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1462                 .rpc_argp       = &rdata->args,
1463                 .rpc_resp       = &rdata->res,
1464                 .rpc_cred       = rdata->cred,
1465         };
1466         unsigned long timestamp = jiffies;
1467         int status;
1468
1469         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1470                         (long long) rdata->args.offset);
1471
1472         nfs_fattr_init(fattr);
1473         status = rpc_call_sync(server->client, &msg, flags);
1474         if (!status)
1475                 renew_lease(server, timestamp);
1476         dprintk("NFS reply read: %d\n", status);
1477         return status;
1478 }
1479
1480 static int nfs4_proc_read(struct nfs_read_data *rdata)
1481 {
1482         struct nfs4_exception exception = { };
1483         int err;
1484         do {
1485                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1486                                 _nfs4_proc_read(rdata),
1487                                 &exception);
1488         } while (exception.retry);
1489         return err;
1490 }
1491
1492 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1493 {
1494         int rpcflags = wdata->flags;
1495         struct inode *inode = wdata->inode;
1496         struct nfs_fattr *fattr = wdata->res.fattr;
1497         struct nfs_server *server = NFS_SERVER(inode);
1498         struct rpc_message msg = {
1499                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1500                 .rpc_argp       = &wdata->args,
1501                 .rpc_resp       = &wdata->res,
1502                 .rpc_cred       = wdata->cred,
1503         };
1504         int status;
1505
1506         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1507                         (long long) wdata->args.offset);
1508
1509         nfs_fattr_init(fattr);
1510         status = rpc_call_sync(server->client, &msg, rpcflags);
1511         dprintk("NFS reply write: %d\n", status);
1512         return status;
1513 }
1514
1515 static int nfs4_proc_write(struct nfs_write_data *wdata)
1516 {
1517         struct nfs4_exception exception = { };
1518         int err;
1519         do {
1520                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1521                                 _nfs4_proc_write(wdata),
1522                                 &exception);
1523         } while (exception.retry);
1524         return err;
1525 }
1526
1527 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1528 {
1529         struct inode *inode = cdata->inode;
1530         struct nfs_fattr *fattr = cdata->res.fattr;
1531         struct nfs_server *server = NFS_SERVER(inode);
1532         struct rpc_message msg = {
1533                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1534                 .rpc_argp       = &cdata->args,
1535                 .rpc_resp       = &cdata->res,
1536                 .rpc_cred       = cdata->cred,
1537         };
1538         int status;
1539
1540         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1541                         (long long) cdata->args.offset);
1542
1543         nfs_fattr_init(fattr);
1544         status = rpc_call_sync(server->client, &msg, 0);
1545         dprintk("NFS reply commit: %d\n", status);
1546         return status;
1547 }
1548
1549 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1550 {
1551         struct nfs4_exception exception = { };
1552         int err;
1553         do {
1554                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1555                                 _nfs4_proc_commit(cdata),
1556                                 &exception);
1557         } while (exception.retry);
1558         return err;
1559 }
1560
1561 /*
1562  * Got race?
1563  * We will need to arrange for the VFS layer to provide an atomic open.
1564  * Until then, this create/open method is prone to inefficiency and race
1565  * conditions due to the lookup, create, and open VFS calls from sys_open()
1566  * placed on the wire.
1567  *
1568  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1569  * The file will be opened again in the subsequent VFS open call
1570  * (nfs4_proc_file_open).
1571  *
1572  * The open for read will just hang around to be used by any process that
1573  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1574  */
1575
1576 static int
1577 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1578                  int flags, struct nameidata *nd)
1579 {
1580         struct nfs4_state *state;
1581         struct rpc_cred *cred;
1582         int status = 0;
1583
1584         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1585         if (IS_ERR(cred)) {
1586                 status = PTR_ERR(cred);
1587                 goto out;
1588         }
1589         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1590         put_rpccred(cred);
1591         if (IS_ERR(state)) {
1592                 status = PTR_ERR(state);
1593                 goto out;
1594         }
1595         d_instantiate(dentry, state->inode);
1596         if (flags & O_EXCL) {
1597                 struct nfs_fattr fattr;
1598                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1599                                      NFS_FH(state->inode), sattr, state);
1600                 if (status == 0)
1601                         nfs_setattr_update_inode(state->inode, sattr);
1602         }
1603         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1604                 nfs4_intent_set_file(nd, dentry, state);
1605         else
1606                 nfs4_close_state(state, flags);
1607 out:
1608         return status;
1609 }
1610
1611 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1612 {
1613         struct nfs_server *server = NFS_SERVER(dir);
1614         struct nfs4_remove_arg args = {
1615                 .fh = NFS_FH(dir),
1616                 .name = name,
1617                 .bitmask = server->attr_bitmask,
1618         };
1619         struct nfs_fattr dir_attr;
1620         struct nfs4_remove_res  res = {
1621                 .server = server,
1622                 .dir_attr = &dir_attr,
1623         };
1624         struct rpc_message msg = {
1625                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1626                 .rpc_argp       = &args,
1627                 .rpc_resp       = &res,
1628         };
1629         int                     status;
1630
1631         nfs_fattr_init(res.dir_attr);
1632         status = rpc_call_sync(server->client, &msg, 0);
1633         if (status == 0) {
1634                 update_changeattr(dir, &res.cinfo);
1635                 nfs_post_op_update_inode(dir, res.dir_attr);
1636         }
1637         return status;
1638 }
1639
1640 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1641 {
1642         struct nfs4_exception exception = { };
1643         int err;
1644         do {
1645                 err = nfs4_handle_exception(NFS_SERVER(dir),
1646                                 _nfs4_proc_remove(dir, name),
1647                                 &exception);
1648         } while (exception.retry);
1649         return err;
1650 }
1651
1652 struct unlink_desc {
1653         struct nfs4_remove_arg  args;
1654         struct nfs4_remove_res  res;
1655         struct nfs_fattr dir_attr;
1656 };
1657
1658 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1659                 struct qstr *name)
1660 {
1661         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1662         struct unlink_desc *up;
1663
1664         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1665         if (!up)
1666                 return -ENOMEM;
1667
1668         up->args.fh = NFS_FH(dir->d_inode);
1669         up->args.name = name;
1670         up->args.bitmask = server->attr_bitmask;
1671         up->res.server = server;
1672         up->res.dir_attr = &up->dir_attr;
1673
1674         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1675         msg->rpc_argp = &up->args;
1676         msg->rpc_resp = &up->res;
1677         return 0;
1678 }
1679
1680 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1681 {
1682         struct rpc_message *msg = &task->tk_msg;
1683         struct unlink_desc *up;
1684
1685         if (msg->rpc_resp != NULL) {
1686                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1687                 update_changeattr(dir->d_inode, &up->res.cinfo);
1688                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1689                 kfree(up);
1690                 msg->rpc_resp = NULL;
1691                 msg->rpc_argp = NULL;
1692         }
1693         return 0;
1694 }
1695
1696 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1697                 struct inode *new_dir, struct qstr *new_name)
1698 {
1699         struct nfs_server *server = NFS_SERVER(old_dir);
1700         struct nfs4_rename_arg arg = {
1701                 .old_dir = NFS_FH(old_dir),
1702                 .new_dir = NFS_FH(new_dir),
1703                 .old_name = old_name,
1704                 .new_name = new_name,
1705                 .bitmask = server->attr_bitmask,
1706         };
1707         struct nfs_fattr old_fattr, new_fattr;
1708         struct nfs4_rename_res res = {
1709                 .server = server,
1710                 .old_fattr = &old_fattr,
1711                 .new_fattr = &new_fattr,
1712         };
1713         struct rpc_message msg = {
1714                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1715                 .rpc_argp = &arg,
1716                 .rpc_resp = &res,
1717         };
1718         int                     status;
1719
1720         nfs_fattr_init(res.old_fattr);
1721         nfs_fattr_init(res.new_fattr);
1722         status = rpc_call_sync(server->client, &msg, 0);
1723
1724         if (!status) {
1725                 update_changeattr(old_dir, &res.old_cinfo);
1726                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1727                 update_changeattr(new_dir, &res.new_cinfo);
1728                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1729         }
1730         return status;
1731 }
1732
1733 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1734                 struct inode *new_dir, struct qstr *new_name)
1735 {
1736         struct nfs4_exception exception = { };
1737         int err;
1738         do {
1739                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1740                                 _nfs4_proc_rename(old_dir, old_name,
1741                                         new_dir, new_name),
1742                                 &exception);
1743         } while (exception.retry);
1744         return err;
1745 }
1746
1747 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1748 {
1749         struct nfs_server *server = NFS_SERVER(inode);
1750         struct nfs4_link_arg arg = {
1751                 .fh     = NFS_FH(inode),
1752                 .dir_fh = NFS_FH(dir),
1753                 .name   = name,
1754                 .bitmask = server->attr_bitmask,
1755         };
1756         struct nfs_fattr fattr, dir_attr;
1757         struct nfs4_link_res res = {
1758                 .server = server,
1759                 .fattr = &fattr,
1760                 .dir_attr = &dir_attr,
1761         };
1762         struct rpc_message msg = {
1763                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1764                 .rpc_argp = &arg,
1765                 .rpc_resp = &res,
1766         };
1767         int                     status;
1768
1769         nfs_fattr_init(res.fattr);
1770         nfs_fattr_init(res.dir_attr);
1771         status = rpc_call_sync(server->client, &msg, 0);
1772         if (!status) {
1773                 update_changeattr(dir, &res.cinfo);
1774                 nfs_post_op_update_inode(dir, res.dir_attr);
1775                 nfs_refresh_inode(inode, res.fattr);
1776         }
1777
1778         return status;
1779 }
1780
1781 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1782 {
1783         struct nfs4_exception exception = { };
1784         int err;
1785         do {
1786                 err = nfs4_handle_exception(NFS_SERVER(inode),
1787                                 _nfs4_proc_link(inode, dir, name),
1788                                 &exception);
1789         } while (exception.retry);
1790         return err;
1791 }
1792
1793 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1794                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1795                 struct nfs_fattr *fattr)
1796 {
1797         struct nfs_server *server = NFS_SERVER(dir);
1798         struct nfs_fattr dir_fattr;
1799         struct nfs4_create_arg arg = {
1800                 .dir_fh = NFS_FH(dir),
1801                 .server = server,
1802                 .name = name,
1803                 .attrs = sattr,
1804                 .ftype = NF4LNK,
1805                 .bitmask = server->attr_bitmask,
1806         };
1807         struct nfs4_create_res res = {
1808                 .server = server,
1809                 .fh = fhandle,
1810                 .fattr = fattr,
1811                 .dir_fattr = &dir_fattr,
1812         };
1813         struct rpc_message msg = {
1814                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1815                 .rpc_argp = &arg,
1816                 .rpc_resp = &res,
1817         };
1818         int                     status;
1819
1820         if (path->len > NFS4_MAXPATHLEN)
1821                 return -ENAMETOOLONG;
1822         arg.u.symlink = path;
1823         nfs_fattr_init(fattr);
1824         nfs_fattr_init(&dir_fattr);
1825
1826         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1827         if (!status)
1828                 update_changeattr(dir, &res.dir_cinfo);
1829         nfs_post_op_update_inode(dir, res.dir_fattr);
1830         return status;
1831 }
1832
1833 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1834                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1835                 struct nfs_fattr *fattr)
1836 {
1837         struct nfs4_exception exception = { };
1838         int err;
1839         do {
1840                 err = nfs4_handle_exception(NFS_SERVER(dir),
1841                                 _nfs4_proc_symlink(dir, name, path, sattr,
1842                                         fhandle, fattr),
1843                                 &exception);
1844         } while (exception.retry);
1845         return err;
1846 }
1847
1848 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1849                 struct iattr *sattr)
1850 {
1851         struct nfs_server *server = NFS_SERVER(dir);
1852         struct nfs_fh fhandle;
1853         struct nfs_fattr fattr, dir_fattr;
1854         struct nfs4_create_arg arg = {
1855                 .dir_fh = NFS_FH(dir),
1856                 .server = server,
1857                 .name = &dentry->d_name,
1858                 .attrs = sattr,
1859                 .ftype = NF4DIR,
1860                 .bitmask = server->attr_bitmask,
1861         };
1862         struct nfs4_create_res res = {
1863                 .server = server,
1864                 .fh = &fhandle,
1865                 .fattr = &fattr,
1866                 .dir_fattr = &dir_fattr,
1867         };
1868         struct rpc_message msg = {
1869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1870                 .rpc_argp = &arg,
1871                 .rpc_resp = &res,
1872         };
1873         int                     status;
1874
1875         nfs_fattr_init(&fattr);
1876         nfs_fattr_init(&dir_fattr);
1877
1878         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1879         if (!status) {
1880                 update_changeattr(dir, &res.dir_cinfo);
1881                 nfs_post_op_update_inode(dir, res.dir_fattr);
1882                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1883         }
1884         return status;
1885 }
1886
1887 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1888                 struct iattr *sattr)
1889 {
1890         struct nfs4_exception exception = { };
1891         int err;
1892         do {
1893                 err = nfs4_handle_exception(NFS_SERVER(dir),
1894                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1895                                 &exception);
1896         } while (exception.retry);
1897         return err;
1898 }
1899
1900 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1901                   u64 cookie, struct page *page, unsigned int count, int plus)
1902 {
1903         struct inode            *dir = dentry->d_inode;
1904         struct nfs4_readdir_arg args = {
1905                 .fh = NFS_FH(dir),
1906                 .pages = &page,
1907                 .pgbase = 0,
1908                 .count = count,
1909                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1910         };
1911         struct nfs4_readdir_res res;
1912         struct rpc_message msg = {
1913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1914                 .rpc_argp = &args,
1915                 .rpc_resp = &res,
1916                 .rpc_cred = cred,
1917         };
1918         int                     status;
1919
1920         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1921                         dentry->d_parent->d_name.name,
1922                         dentry->d_name.name,
1923                         (unsigned long long)cookie);
1924         lock_kernel();
1925         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1926         res.pgbase = args.pgbase;
1927         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1928         if (status == 0)
1929                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1930         unlock_kernel();
1931         dprintk("%s: returns %d\n", __FUNCTION__, status);
1932         return status;
1933 }
1934
1935 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1936                   u64 cookie, struct page *page, unsigned int count, int plus)
1937 {
1938         struct nfs4_exception exception = { };
1939         int err;
1940         do {
1941                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1942                                 _nfs4_proc_readdir(dentry, cred, cookie,
1943                                         page, count, plus),
1944                                 &exception);
1945         } while (exception.retry);
1946         return err;
1947 }
1948
1949 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1950                 struct iattr *sattr, dev_t rdev)
1951 {
1952         struct nfs_server *server = NFS_SERVER(dir);
1953         struct nfs_fh fh;
1954         struct nfs_fattr fattr, dir_fattr;
1955         struct nfs4_create_arg arg = {
1956                 .dir_fh = NFS_FH(dir),
1957                 .server = server,
1958                 .name = &dentry->d_name,
1959                 .attrs = sattr,
1960                 .bitmask = server->attr_bitmask,
1961         };
1962         struct nfs4_create_res res = {
1963                 .server = server,
1964                 .fh = &fh,
1965                 .fattr = &fattr,
1966                 .dir_fattr = &dir_fattr,
1967         };
1968         struct rpc_message msg = {
1969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1970                 .rpc_argp = &arg,
1971                 .rpc_resp = &res,
1972         };
1973         int                     status;
1974         int                     mode = sattr->ia_mode;
1975
1976         nfs_fattr_init(&fattr);
1977         nfs_fattr_init(&dir_fattr);
1978
1979         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1980         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1981         if (S_ISFIFO(mode))
1982                 arg.ftype = NF4FIFO;
1983         else if (S_ISBLK(mode)) {
1984                 arg.ftype = NF4BLK;
1985                 arg.u.device.specdata1 = MAJOR(rdev);
1986                 arg.u.device.specdata2 = MINOR(rdev);
1987         }
1988         else if (S_ISCHR(mode)) {
1989                 arg.ftype = NF4CHR;
1990                 arg.u.device.specdata1 = MAJOR(rdev);
1991                 arg.u.device.specdata2 = MINOR(rdev);
1992         }
1993         else
1994                 arg.ftype = NF4SOCK;
1995
1996         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1997         if (status == 0) {
1998                 update_changeattr(dir, &res.dir_cinfo);
1999                 nfs_post_op_update_inode(dir, res.dir_fattr);
2000                 status = nfs_instantiate(dentry, &fh, &fattr);
2001         }
2002         return status;
2003 }
2004
2005 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2006                 struct iattr *sattr, dev_t rdev)
2007 {
2008         struct nfs4_exception exception = { };
2009         int err;
2010         do {
2011                 err = nfs4_handle_exception(NFS_SERVER(dir),
2012                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2013                                 &exception);
2014         } while (exception.retry);
2015         return err;
2016 }
2017
2018 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2019                  struct nfs_fsstat *fsstat)
2020 {
2021         struct nfs4_statfs_arg args = {
2022                 .fh = fhandle,
2023                 .bitmask = server->attr_bitmask,
2024         };
2025         struct rpc_message msg = {
2026                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2027                 .rpc_argp = &args,
2028                 .rpc_resp = fsstat,
2029         };
2030
2031         nfs_fattr_init(fsstat->fattr);
2032         return rpc_call_sync(server->client, &msg, 0);
2033 }
2034
2035 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2036 {
2037         struct nfs4_exception exception = { };
2038         int err;
2039         do {
2040                 err = nfs4_handle_exception(server,
2041                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2042                                 &exception);
2043         } while (exception.retry);
2044         return err;
2045 }
2046
2047 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2048                 struct nfs_fsinfo *fsinfo)
2049 {
2050         struct nfs4_fsinfo_arg args = {
2051                 .fh = fhandle,
2052                 .bitmask = server->attr_bitmask,
2053         };
2054         struct rpc_message msg = {
2055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2056                 .rpc_argp = &args,
2057                 .rpc_resp = fsinfo,
2058         };
2059
2060         return rpc_call_sync(server->client, &msg, 0);
2061 }
2062
2063 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2064 {
2065         struct nfs4_exception exception = { };
2066         int err;
2067
2068         do {
2069                 err = nfs4_handle_exception(server,
2070                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2071                                 &exception);
2072         } while (exception.retry);
2073         return err;
2074 }
2075
2076 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2077 {
2078         nfs_fattr_init(fsinfo->fattr);
2079         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2080 }
2081
2082 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2083                 struct nfs_pathconf *pathconf)
2084 {
2085         struct nfs4_pathconf_arg args = {
2086                 .fh = fhandle,
2087                 .bitmask = server->attr_bitmask,
2088         };
2089         struct rpc_message msg = {
2090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2091                 .rpc_argp = &args,
2092                 .rpc_resp = pathconf,
2093         };
2094
2095         /* None of the pathconf attributes are mandatory to implement */
2096         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2097                 memset(pathconf, 0, sizeof(*pathconf));
2098                 return 0;
2099         }
2100
2101         nfs_fattr_init(pathconf->fattr);
2102         return rpc_call_sync(server->client, &msg, 0);
2103 }
2104
2105 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2106                 struct nfs_pathconf *pathconf)
2107 {
2108         struct nfs4_exception exception = { };
2109         int err;
2110
2111         do {
2112                 err = nfs4_handle_exception(server,
2113                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2114                                 &exception);
2115         } while (exception.retry);
2116         return err;
2117 }
2118
2119 static void
2120 nfs4_read_done(struct rpc_task *task)
2121 {
2122         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2123         struct inode *inode = data->inode;
2124
2125         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2126                 rpc_restart_call(task);
2127                 return;
2128         }
2129         if (task->tk_status > 0)
2130                 renew_lease(NFS_SERVER(inode), data->timestamp);
2131         /* Call back common NFS readpage processing */
2132         nfs_readpage_result(task);
2133 }
2134
2135 static void
2136 nfs4_proc_read_setup(struct nfs_read_data *data)
2137 {
2138         struct rpc_task *task = &data->task;
2139         struct rpc_message msg = {
2140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2141                 .rpc_argp = &data->args,
2142                 .rpc_resp = &data->res,
2143                 .rpc_cred = data->cred,
2144         };
2145         struct inode *inode = data->inode;
2146         int flags;
2147
2148         data->timestamp   = jiffies;
2149
2150         /* N.B. Do we need to test? Never called for swapfile inode */
2151         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2152
2153         /* Finalize the task. */
2154         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2155         rpc_call_setup(task, &msg, 0);
2156 }
2157
2158 static void
2159 nfs4_write_done(struct rpc_task *task)
2160 {
2161         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2162         struct inode *inode = data->inode;
2163
2164         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2165                 rpc_restart_call(task);
2166                 return;
2167         }
2168         if (task->tk_status >= 0) {
2169                 renew_lease(NFS_SERVER(inode), data->timestamp);
2170                 nfs_post_op_update_inode(inode, data->res.fattr);
2171         }
2172         /* Call back common NFS writeback processing */
2173         nfs_writeback_done(task);
2174 }
2175
2176 static void
2177 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2178 {
2179         struct rpc_task *task = &data->task;
2180         struct rpc_message msg = {
2181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2182                 .rpc_argp = &data->args,
2183                 .rpc_resp = &data->res,
2184                 .rpc_cred = data->cred,
2185         };
2186         struct inode *inode = data->inode;
2187         struct nfs_server *server = NFS_SERVER(inode);
2188         int stable;
2189         int flags;
2190
2191         if (how & FLUSH_STABLE) {
2192                 if (!NFS_I(inode)->ncommit)
2193                         stable = NFS_FILE_SYNC;
2194                 else
2195                         stable = NFS_DATA_SYNC;
2196         } else
2197                 stable = NFS_UNSTABLE;
2198         data->args.stable = stable;
2199         data->args.bitmask = server->attr_bitmask;
2200         data->res.server = server;
2201
2202         data->timestamp   = jiffies;
2203
2204         /* Set the initial flags for the task.  */
2205         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2206
2207         /* Finalize the task. */
2208         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2209         rpc_call_setup(task, &msg, 0);
2210 }
2211
2212 static void
2213 nfs4_commit_done(struct rpc_task *task)
2214 {
2215         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2216         struct inode *inode = data->inode;
2217
2218         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2219                 rpc_restart_call(task);
2220                 return;
2221         }
2222         if (task->tk_status >= 0)
2223                 nfs_post_op_update_inode(inode, data->res.fattr);
2224         /* Call back common NFS writeback processing */
2225         nfs_commit_done(task);
2226 }
2227
2228 static void
2229 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2230 {
2231         struct rpc_task *task = &data->task;
2232         struct rpc_message msg = {
2233                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2234                 .rpc_argp = &data->args,
2235                 .rpc_resp = &data->res,
2236                 .rpc_cred = data->cred,
2237         };
2238         struct inode *inode = data->inode;
2239         struct nfs_server *server = NFS_SERVER(inode);
2240         int flags;
2241
2242         data->args.bitmask = server->attr_bitmask;
2243         data->res.server = server;
2244
2245         /* Set the initial flags for the task.  */
2246         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2247
2248         /* Finalize the task. */
2249         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2250         rpc_call_setup(task, &msg, 0);
2251 }
2252
2253 /*
2254  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2255  * standalone procedure for queueing an asynchronous RENEW.
2256  */
2257 static void
2258 renew_done(struct rpc_task *task)
2259 {
2260         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2261         unsigned long timestamp = (unsigned long)task->tk_calldata;
2262
2263         if (task->tk_status < 0) {
2264                 switch (task->tk_status) {
2265                         case -NFS4ERR_STALE_CLIENTID:
2266                         case -NFS4ERR_EXPIRED:
2267                         case -NFS4ERR_CB_PATH_DOWN:
2268                                 nfs4_schedule_state_recovery(clp);
2269                 }
2270                 return;
2271         }
2272         spin_lock(&clp->cl_lock);
2273         if (time_before(clp->cl_last_renewal,timestamp))
2274                 clp->cl_last_renewal = timestamp;
2275         spin_unlock(&clp->cl_lock);
2276 }
2277
2278 int
2279 nfs4_proc_async_renew(struct nfs4_client *clp)
2280 {
2281         struct rpc_message msg = {
2282                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2283                 .rpc_argp       = clp,
2284                 .rpc_cred       = clp->cl_cred,
2285         };
2286
2287         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2288                         renew_done, (void *)jiffies);
2289 }
2290
2291 int
2292 nfs4_proc_renew(struct nfs4_client *clp)
2293 {
2294         struct rpc_message msg = {
2295                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2296                 .rpc_argp       = clp,
2297                 .rpc_cred       = clp->cl_cred,
2298         };
2299         unsigned long now = jiffies;
2300         int status;
2301
2302         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2303         if (status < 0)
2304                 return status;
2305         spin_lock(&clp->cl_lock);
2306         if (time_before(clp->cl_last_renewal,now))
2307                 clp->cl_last_renewal = now;
2308         spin_unlock(&clp->cl_lock);
2309         return 0;
2310 }
2311
2312 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2313 {
2314         return (server->caps & NFS_CAP_ACLS)
2315                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2316                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2317 }
2318
2319 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2320  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2321  * the stack.
2322  */
2323 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2324
2325 static void buf_to_pages(const void *buf, size_t buflen,
2326                 struct page **pages, unsigned int *pgbase)
2327 {
2328         const void *p = buf;
2329
2330         *pgbase = offset_in_page(buf);
2331         p -= *pgbase;
2332         while (p < buf + buflen) {
2333                 *(pages++) = virt_to_page(p);
2334                 p += PAGE_CACHE_SIZE;
2335         }
2336 }
2337
2338 struct nfs4_cached_acl {
2339         int cached;
2340         size_t len;
2341         char data[0];
2342 };
2343
2344 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2345 {
2346         struct nfs_inode *nfsi = NFS_I(inode);
2347
2348         spin_lock(&inode->i_lock);
2349         kfree(nfsi->nfs4_acl);
2350         nfsi->nfs4_acl = acl;
2351         spin_unlock(&inode->i_lock);
2352 }
2353
2354 static void nfs4_zap_acl_attr(struct inode *inode)
2355 {
2356         nfs4_set_cached_acl(inode, NULL);
2357 }
2358
2359 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2360 {
2361         struct nfs_inode *nfsi = NFS_I(inode);
2362         struct nfs4_cached_acl *acl;
2363         int ret = -ENOENT;
2364
2365         spin_lock(&inode->i_lock);
2366         acl = nfsi->nfs4_acl;
2367         if (acl == NULL)
2368                 goto out;
2369         if (buf == NULL) /* user is just asking for length */
2370                 goto out_len;
2371         if (acl->cached == 0)
2372                 goto out;
2373         ret = -ERANGE; /* see getxattr(2) man page */
2374         if (acl->len > buflen)
2375                 goto out;
2376         memcpy(buf, acl->data, acl->len);
2377 out_len:
2378         ret = acl->len;
2379 out:
2380         spin_unlock(&inode->i_lock);
2381         return ret;
2382 }
2383
2384 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2385 {
2386         struct nfs4_cached_acl *acl;
2387
2388         if (buf && acl_len <= PAGE_SIZE) {
2389                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2390                 if (acl == NULL)
2391                         goto out;
2392                 acl->cached = 1;
2393                 memcpy(acl->data, buf, acl_len);
2394         } else {
2395                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2396                 if (acl == NULL)
2397                         goto out;
2398                 acl->cached = 0;
2399         }
2400         acl->len = acl_len;
2401 out:
2402         nfs4_set_cached_acl(inode, acl);
2403 }
2404
2405 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2406 {
2407         struct page *pages[NFS4ACL_MAXPAGES];
2408         struct nfs_getaclargs args = {
2409                 .fh = NFS_FH(inode),
2410                 .acl_pages = pages,
2411                 .acl_len = buflen,
2412         };
2413         size_t resp_len = buflen;
2414         void *resp_buf;
2415         struct rpc_message msg = {
2416                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2417                 .rpc_argp = &args,
2418                 .rpc_resp = &resp_len,
2419         };
2420         struct page *localpage = NULL;
2421         int ret;
2422
2423         if (buflen < PAGE_SIZE) {
2424                 /* As long as we're doing a round trip to the server anyway,
2425                  * let's be prepared for a page of acl data. */
2426                 localpage = alloc_page(GFP_KERNEL);
2427                 resp_buf = page_address(localpage);
2428                 if (localpage == NULL)
2429                         return -ENOMEM;
2430                 args.acl_pages[0] = localpage;
2431                 args.acl_pgbase = 0;
2432                 resp_len = args.acl_len = PAGE_SIZE;
2433         } else {
2434                 resp_buf = buf;
2435                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2436         }
2437         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2438         if (ret)
2439                 goto out_free;
2440         if (resp_len > args.acl_len)
2441                 nfs4_write_cached_acl(inode, NULL, resp_len);
2442         else
2443                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2444         if (buf) {
2445                 ret = -ERANGE;
2446                 if (resp_len > buflen)
2447                         goto out_free;
2448                 if (localpage)
2449                         memcpy(buf, resp_buf, resp_len);
2450         }
2451         ret = resp_len;
2452 out_free:
2453         if (localpage)
2454                 __free_page(localpage);
2455         return ret;
2456 }
2457
2458 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2459 {
2460         struct nfs_server *server = NFS_SERVER(inode);
2461         int ret;
2462
2463         if (!nfs4_server_supports_acls(server))
2464                 return -EOPNOTSUPP;
2465         ret = nfs_revalidate_inode(server, inode);
2466         if (ret < 0)
2467                 return ret;
2468         ret = nfs4_read_cached_acl(inode, buf, buflen);
2469         if (ret != -ENOENT)
2470                 return ret;
2471         return nfs4_get_acl_uncached(inode, buf, buflen);
2472 }
2473
2474 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2475 {
2476         struct nfs_server *server = NFS_SERVER(inode);
2477         struct page *pages[NFS4ACL_MAXPAGES];
2478         struct nfs_setaclargs arg = {
2479                 .fh             = NFS_FH(inode),
2480                 .acl_pages      = pages,
2481                 .acl_len        = buflen,
2482         };
2483         struct rpc_message msg = {
2484                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2485                 .rpc_argp       = &arg,
2486                 .rpc_resp       = NULL,
2487         };
2488         int ret;
2489
2490         if (!nfs4_server_supports_acls(server))
2491                 return -EOPNOTSUPP;
2492         nfs_inode_return_delegation(inode);
2493         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2494         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2495         if (ret == 0)
2496                 nfs4_write_cached_acl(inode, buf, buflen);
2497         return ret;
2498 }
2499
2500 static int
2501 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2502 {
2503         struct nfs4_client *clp = server->nfs4_state;
2504
2505         if (!clp || task->tk_status >= 0)
2506                 return 0;
2507         switch(task->tk_status) {
2508                 case -NFS4ERR_STALE_CLIENTID:
2509                 case -NFS4ERR_STALE_STATEID:
2510                 case -NFS4ERR_EXPIRED:
2511                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2512                         nfs4_schedule_state_recovery(clp);
2513                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2514                                 rpc_wake_up_task(task);
2515                         task->tk_status = 0;
2516                         return -EAGAIN;
2517                 case -NFS4ERR_GRACE:
2518                 case -NFS4ERR_DELAY:
2519                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2520                         task->tk_status = 0;
2521                         return -EAGAIN;
2522                 case -NFS4ERR_OLD_STATEID:
2523                         task->tk_status = 0;
2524                         return -EAGAIN;
2525         }
2526         task->tk_status = nfs4_map_errors(task->tk_status);
2527         return 0;
2528 }
2529
2530 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2531 {
2532         DEFINE_WAIT(wait);
2533         sigset_t oldset;
2534         int interruptible, res = 0;
2535
2536         might_sleep();
2537
2538         rpc_clnt_sigmask(clnt, &oldset);
2539         interruptible = TASK_UNINTERRUPTIBLE;
2540         if (clnt->cl_intr)
2541                 interruptible = TASK_INTERRUPTIBLE;
2542         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2543         nfs4_schedule_state_recovery(clp);
2544         if (clnt->cl_intr && signalled())
2545                 res = -ERESTARTSYS;
2546         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2547                 schedule();
2548         finish_wait(&clp->cl_waitq, &wait);
2549         rpc_clnt_sigunmask(clnt, &oldset);
2550         return res;
2551 }
2552
2553 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2554 {
2555         sigset_t oldset;
2556         int res = 0;
2557
2558         might_sleep();
2559
2560         if (*timeout <= 0)
2561                 *timeout = NFS4_POLL_RETRY_MIN;
2562         if (*timeout > NFS4_POLL_RETRY_MAX)
2563                 *timeout = NFS4_POLL_RETRY_MAX;
2564         rpc_clnt_sigmask(clnt, &oldset);
2565         if (clnt->cl_intr) {
2566                 schedule_timeout_interruptible(*timeout);
2567                 if (signalled())
2568                         res = -ERESTARTSYS;
2569         } else
2570                 schedule_timeout_uninterruptible(*timeout);
2571         rpc_clnt_sigunmask(clnt, &oldset);
2572         *timeout <<= 1;
2573         return res;
2574 }
2575
2576 /* This is the error handling routine for processes that are allowed
2577  * to sleep.
2578  */
2579 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2580 {
2581         struct nfs4_client *clp = server->nfs4_state;
2582         int ret = errorcode;
2583
2584         exception->retry = 0;
2585         switch(errorcode) {
2586                 case 0:
2587                         return 0;
2588                 case -NFS4ERR_STALE_CLIENTID:
2589                 case -NFS4ERR_STALE_STATEID:
2590                 case -NFS4ERR_EXPIRED:
2591                         ret = nfs4_wait_clnt_recover(server->client, clp);
2592                         if (ret == 0)
2593                                 exception->retry = 1;
2594                         break;
2595                 case -NFS4ERR_GRACE:
2596                 case -NFS4ERR_DELAY:
2597                         ret = nfs4_delay(server->client, &exception->timeout);
2598                         if (ret != 0)
2599                                 break;
2600                 case -NFS4ERR_OLD_STATEID:
2601                         exception->retry = 1;
2602         }
2603         /* We failed to handle the error */
2604         return nfs4_map_errors(ret);
2605 }
2606
2607 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2608 {
2609         nfs4_verifier sc_verifier;
2610         struct nfs4_setclientid setclientid = {
2611                 .sc_verifier = &sc_verifier,
2612                 .sc_prog = program,
2613         };
2614         struct rpc_message msg = {
2615                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2616                 .rpc_argp = &setclientid,
2617                 .rpc_resp = clp,
2618                 .rpc_cred = clp->cl_cred,
2619         };
2620         u32 *p;
2621         int loop = 0;
2622         int status;
2623
2624         p = (u32*)sc_verifier.data;
2625         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2626         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2627
2628         for(;;) {
2629                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2630                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2631                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2632                                 clp->cl_cred->cr_ops->cr_name,
2633                                 clp->cl_id_uniquifier);
2634                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2635                                 sizeof(setclientid.sc_netid), "tcp");
2636                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2637                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2638                                 clp->cl_ipaddr, port >> 8, port & 255);
2639
2640                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2641                 if (status != -NFS4ERR_CLID_INUSE)
2642                         break;
2643                 if (signalled())
2644                         break;
2645                 if (loop++ & 1)
2646                         ssleep(clp->cl_lease_time + 1);
2647                 else
2648                         if (++clp->cl_id_uniquifier == 0)
2649                                 break;
2650         }
2651         return status;
2652 }
2653
2654 int
2655 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2656 {
2657         struct nfs_fsinfo fsinfo;
2658         struct rpc_message msg = {
2659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2660                 .rpc_argp = clp,
2661                 .rpc_resp = &fsinfo,
2662                 .rpc_cred = clp->cl_cred,
2663         };
2664         unsigned long now;
2665         int status;
2666
2667         now = jiffies;
2668         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2669         if (status == 0) {
2670                 spin_lock(&clp->cl_lock);
2671                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2672                 clp->cl_last_renewal = now;
2673                 spin_unlock(&clp->cl_lock);
2674         }
2675         return status;
2676 }
2677
2678 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2679 {
2680         struct nfs4_delegreturnargs args = {
2681                 .fhandle = NFS_FH(inode),
2682                 .stateid = stateid,
2683         };
2684         struct rpc_message msg = {
2685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2686                 .rpc_argp = &args,
2687                 .rpc_cred = cred,
2688         };
2689
2690         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2691 }
2692
2693 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2694 {
2695         struct nfs_server *server = NFS_SERVER(inode);
2696         struct nfs4_exception exception = { };
2697         int err;
2698         do {
2699                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2700                 switch (err) {
2701                         case -NFS4ERR_STALE_STATEID:
2702                         case -NFS4ERR_EXPIRED:
2703                                 nfs4_schedule_state_recovery(server->nfs4_state);
2704                         case 0:
2705                                 return 0;
2706                 }
2707                 err = nfs4_handle_exception(server, err, &exception);
2708         } while (exception.retry);
2709         return err;
2710 }
2711
2712 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2713 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2714
2715 /*
2716  * sleep, with exponential backoff, and retry the LOCK operation.
2717  */
2718 static unsigned long
2719 nfs4_set_lock_task_retry(unsigned long timeout)
2720 {
2721         schedule_timeout_interruptible(timeout);
2722         timeout <<= 1;
2723         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2724                 return NFS4_LOCK_MAXTIMEOUT;
2725         return timeout;
2726 }
2727
2728 static inline int
2729 nfs4_lck_type(int cmd, struct file_lock *request)
2730 {
2731         /* set lock type */
2732         switch (request->fl_type) {
2733                 case F_RDLCK:
2734                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2735                 case F_WRLCK:
2736                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2737                 case F_UNLCK:
2738                         return NFS4_WRITE_LT;
2739         }
2740         BUG();
2741         return 0;
2742 }
2743
2744 static inline uint64_t
2745 nfs4_lck_length(struct file_lock *request)
2746 {
2747         if (request->fl_end == OFFSET_MAX)
2748                 return ~(uint64_t)0;
2749         return request->fl_end - request->fl_start + 1;
2750 }
2751
2752 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2753 {
2754         struct inode *inode = state->inode;
2755         struct nfs_server *server = NFS_SERVER(inode);
2756         struct nfs4_client *clp = server->nfs4_state;
2757         struct nfs_lockargs arg = {
2758                 .fh = NFS_FH(inode),
2759                 .type = nfs4_lck_type(cmd, request),
2760                 .offset = request->fl_start,
2761                 .length = nfs4_lck_length(request),
2762         };
2763         struct nfs_lockres res = {
2764                 .server = server,
2765         };
2766         struct rpc_message msg = {
2767                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2768                 .rpc_argp       = &arg,
2769                 .rpc_resp       = &res,
2770                 .rpc_cred       = state->owner->so_cred,
2771         };
2772         struct nfs_lowner nlo;
2773         struct nfs4_lock_state *lsp;
2774         int status;
2775
2776         down_read(&clp->cl_sem);
2777         nlo.clientid = clp->cl_clientid;
2778         status = nfs4_set_lock_state(state, request);
2779         if (status != 0)
2780                 goto out;
2781         lsp = request->fl_u.nfs4_fl.owner;
2782         nlo.id = lsp->ls_id;
2783         arg.u.lockt = &nlo;
2784         status = rpc_call_sync(server->client, &msg, 0);
2785         if (!status) {
2786                 request->fl_type = F_UNLCK;
2787         } else if (status == -NFS4ERR_DENIED) {
2788                 int64_t len, start, end;
2789                 start = res.u.denied.offset;
2790                 len = res.u.denied.length;
2791                 end = start + len - 1;
2792                 if (end < 0 || len == 0)
2793                         request->fl_end = OFFSET_MAX;
2794                 else
2795                         request->fl_end = (loff_t)end;
2796                 request->fl_start = (loff_t)start;
2797                 request->fl_type = F_WRLCK;
2798                 if (res.u.denied.type & 1)
2799                         request->fl_type = F_RDLCK;
2800                 request->fl_pid = 0;
2801                 status = 0;
2802         }
2803 out:
2804         up_read(&clp->cl_sem);
2805         return status;
2806 }
2807
2808 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2809 {
2810         struct nfs4_exception exception = { };
2811         int err;
2812
2813         do {
2814                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2815                                 _nfs4_proc_getlk(state, cmd, request),
2816                                 &exception);
2817         } while (exception.retry);
2818         return err;
2819 }
2820
2821 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2822 {
2823         int res = 0;
2824         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2825                 case FL_POSIX:
2826                         res = posix_lock_file_wait(file, fl);
2827                         break;
2828                 case FL_FLOCK:
2829                         res = flock_lock_file_wait(file, fl);
2830                         break;
2831                 default:
2832                         BUG();
2833         }
2834         if (res < 0)
2835                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2836                                 __FUNCTION__);
2837         return res;
2838 }
2839
2840 struct nfs4_unlockdata {
2841         struct nfs_lockargs arg;
2842         struct nfs_locku_opargs luargs;
2843         struct nfs_lockres res;
2844         struct nfs4_lock_state *lsp;
2845         struct nfs_open_context *ctx;
2846         atomic_t refcount;
2847         struct completion completion;
2848 };
2849
2850 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2851 {
2852         if (atomic_dec_and_test(&calldata->refcount)) {
2853                 nfs_free_seqid(calldata->luargs.seqid);
2854                 nfs4_put_lock_state(calldata->lsp);
2855                 put_nfs_open_context(calldata->ctx);
2856                 kfree(calldata);
2857         }
2858 }
2859
2860 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2861 {
2862         complete(&calldata->completion);
2863         nfs4_locku_release_calldata(calldata);
2864 }
2865
2866 static void nfs4_locku_done(struct rpc_task *task)
2867 {
2868         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2869
2870         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2871         switch (task->tk_status) {
2872                 case 0:
2873                         memcpy(calldata->lsp->ls_stateid.data,
2874                                         calldata->res.u.stateid.data,
2875                                         sizeof(calldata->lsp->ls_stateid.data));
2876                         break;
2877                 case -NFS4ERR_STALE_STATEID:
2878                 case -NFS4ERR_EXPIRED:
2879                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2880                         break;
2881                 default:
2882                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2883                                 rpc_restart_call(task);
2884                                 return;
2885                         }
2886         }
2887         nfs4_locku_complete(calldata);
2888 }
2889
2890 static void nfs4_locku_begin(struct rpc_task *task)
2891 {
2892         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2893         struct rpc_message msg = {
2894                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2895                 .rpc_argp       = &calldata->arg,
2896                 .rpc_resp       = &calldata->res,
2897                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2898         };
2899         int status;
2900
2901         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2902         if (status != 0)
2903                 return;
2904         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2905                 nfs4_locku_complete(calldata);
2906                 task->tk_exit = NULL;
2907                 rpc_exit(task, 0);
2908                 return;
2909         }
2910         rpc_call_setup(task, &msg, 0);
2911 }
2912
2913 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2914 {
2915         struct nfs4_unlockdata *calldata;
2916         struct inode *inode = state->inode;
2917         struct nfs_server *server = NFS_SERVER(inode);
2918         struct nfs4_lock_state *lsp;
2919         int status;
2920
2921         /* Is this a delegated lock? */
2922         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
2923                 return do_vfs_lock(request->fl_file, request);
2924
2925         status = nfs4_set_lock_state(state, request);
2926         if (status != 0)
2927                 return status;
2928         lsp = request->fl_u.nfs4_fl.owner;
2929         /* We might have lost the locks! */
2930         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2931                 return 0;
2932         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2933         if (calldata == NULL)
2934                 return -ENOMEM;
2935         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2936         if (calldata->luargs.seqid == NULL) {
2937                 kfree(calldata);
2938                 return -ENOMEM;
2939         }
2940         calldata->luargs.stateid = &lsp->ls_stateid;
2941         calldata->arg.fh = NFS_FH(inode);
2942         calldata->arg.type = nfs4_lck_type(cmd, request);
2943         calldata->arg.offset = request->fl_start;
2944         calldata->arg.length = nfs4_lck_length(request);
2945         calldata->arg.u.locku = &calldata->luargs;
2946         calldata->res.server = server;
2947         calldata->lsp = lsp;
2948         atomic_inc(&lsp->ls_count);
2949
2950         /* Ensure we don't close file until we're done freeing locks! */
2951         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2952
2953         atomic_set(&calldata->refcount, 2);
2954         init_completion(&calldata->completion);
2955
2956         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2957                         nfs4_locku_done, calldata);
2958         if (status == 0)
2959                 wait_for_completion_interruptible(&calldata->completion);
2960         do_vfs_lock(request->fl_file, request);
2961         nfs4_locku_release_calldata(calldata);
2962         return status;
2963 }
2964
2965 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2966 {
2967         struct inode *inode = state->inode;
2968         struct nfs_server *server = NFS_SERVER(inode);
2969         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2970         struct nfs_lock_opargs largs = {
2971                 .lock_stateid = &lsp->ls_stateid,
2972                 .open_stateid = &state->stateid,
2973                 .lock_owner = {
2974                         .clientid = server->nfs4_state->cl_clientid,
2975                         .id = lsp->ls_id,
2976                 },
2977                 .reclaim = reclaim,
2978         };
2979         struct nfs_lockargs arg = {
2980                 .fh = NFS_FH(inode),
2981                 .type = nfs4_lck_type(cmd, request),
2982                 .offset = request->fl_start,
2983                 .length = nfs4_lck_length(request),
2984                 .u = {
2985                         .lock = &largs,
2986                 },
2987         };
2988         struct nfs_lockres res = {
2989                 .server = server,
2990         };
2991         struct rpc_message msg = {
2992                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2993                 .rpc_argp       = &arg,
2994                 .rpc_resp       = &res,
2995                 .rpc_cred       = state->owner->so_cred,
2996         };
2997         int status = -ENOMEM;
2998
2999         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3000         if (largs.lock_seqid == NULL)
3001                 return -ENOMEM;
3002         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3003                 struct nfs4_state_owner *owner = state->owner;
3004
3005                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3006                 if (largs.open_seqid == NULL)
3007                         goto out;
3008                 largs.new_lock_owner = 1;
3009                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3010                 /* increment open seqid on success, and seqid mutating errors */
3011                 if (largs.new_lock_owner != 0) {
3012                         nfs_increment_open_seqid(status, largs.open_seqid);
3013                         if (status == 0)
3014                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
3015                 }
3016                 nfs_free_seqid(largs.open_seqid);
3017         } else
3018                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3019         /* increment lock seqid on success, and seqid mutating errors*/
3020         nfs_increment_lock_seqid(status, largs.lock_seqid);
3021         /* save the returned stateid. */
3022         if (status == 0) {
3023                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3024                                 sizeof(lsp->ls_stateid.data));
3025                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3026         } else if (status == -NFS4ERR_DENIED)
3027                 status = -EAGAIN;
3028 out:
3029         nfs_free_seqid(largs.lock_seqid);
3030         return status;
3031 }
3032
3033 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3034 {
3035         struct nfs_server *server = NFS_SERVER(state->inode);
3036         struct nfs4_exception exception = { };
3037         int err;
3038
3039         /* Cache the lock if possible... */
3040         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3041                 return 0;
3042         do {
3043                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3044                 if (err != -NFS4ERR_DELAY)
3045                         break;
3046                 nfs4_handle_exception(server, err, &exception);
3047         } while (exception.retry);
3048         return err;
3049 }
3050
3051 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3052 {
3053         struct nfs_server *server = NFS_SERVER(state->inode);
3054         struct nfs4_exception exception = { };
3055         int err;
3056
3057         err = nfs4_set_lock_state(state, request);
3058         if (err != 0)
3059                 return err;
3060         do {
3061                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3062                 if (err != -NFS4ERR_DELAY)
3063                         break;
3064                 nfs4_handle_exception(server, err, &exception);
3065         } while (exception.retry);
3066         return err;
3067 }
3068
3069 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3070 {
3071         struct nfs4_client *clp = state->owner->so_client;
3072         int status;
3073
3074         /* Is this a delegated open? */
3075         if (NFS_I(state->inode)->delegation_state != 0) {
3076                 /* Yes: cache locks! */
3077                 status = do_vfs_lock(request->fl_file, request);
3078                 /* ...but avoid races with delegation recall... */
3079                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3080                         return status;
3081         }
3082         down_read(&clp->cl_sem);
3083         status = nfs4_set_lock_state(state, request);
3084         if (status != 0)
3085                 goto out;
3086         status = _nfs4_do_setlk(state, cmd, request, 0);
3087         if (status != 0)
3088                 goto out;
3089         /* Note: we always want to sleep here! */
3090         request->fl_flags |= FL_SLEEP;
3091         if (do_vfs_lock(request->fl_file, request) < 0)
3092                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3093 out:
3094         up_read(&clp->cl_sem);
3095         return status;
3096 }
3097
3098 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3099 {
3100         struct nfs4_exception exception = { };
3101         int err;
3102
3103         do {
3104                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3105                                 _nfs4_proc_setlk(state, cmd, request),
3106                                 &exception);
3107         } while (exception.retry);
3108         return err;
3109 }
3110
3111 static int
3112 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3113 {
3114         struct nfs_open_context *ctx;
3115         struct nfs4_state *state;
3116         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3117         int status;
3118
3119         /* verify open state */
3120         ctx = (struct nfs_open_context *)filp->private_data;
3121         state = ctx->state;
3122
3123         if (request->fl_start < 0 || request->fl_end < 0)
3124                 return -EINVAL;
3125
3126         if (IS_GETLK(cmd))
3127                 return nfs4_proc_getlk(state, F_GETLK, request);
3128
3129         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3130                 return -EINVAL;
3131
3132         if (request->fl_type == F_UNLCK)
3133                 return nfs4_proc_unlck(state, cmd, request);
3134
3135         do {
3136                 status = nfs4_proc_setlk(state, cmd, request);
3137                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3138                         break;
3139                 timeout = nfs4_set_lock_task_retry(timeout);
3140                 status = -ERESTARTSYS;
3141                 if (signalled())
3142                         break;
3143         } while(status < 0);
3144         return status;
3145 }
3146
3147 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3148 {
3149         struct nfs_server *server = NFS_SERVER(state->inode);
3150         struct nfs4_exception exception = { };
3151         int err;
3152
3153         err = nfs4_set_lock_state(state, fl);
3154         if (err != 0)
3155                 goto out;
3156         do {
3157                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3158                 if (err != -NFS4ERR_DELAY)
3159                         break;
3160                 err = nfs4_handle_exception(server, err, &exception);
3161         } while (exception.retry);
3162 out:
3163         return err;
3164 }
3165
3166 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3167
3168 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3169                 size_t buflen, int flags)
3170 {
3171         struct inode *inode = dentry->d_inode;
3172
3173         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3174                 return -EOPNOTSUPP;
3175
3176         if (!S_ISREG(inode->i_mode) &&
3177             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3178                 return -EPERM;
3179
3180         return nfs4_proc_set_acl(inode, buf, buflen);
3181 }
3182
3183 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3184  * and that's what we'll do for e.g. user attributes that haven't been set.
3185  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3186  * attributes in kernel-managed attribute namespaces. */
3187 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3188                 size_t buflen)
3189 {
3190         struct inode *inode = dentry->d_inode;
3191
3192         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3193                 return -EOPNOTSUPP;
3194
3195         return nfs4_proc_get_acl(inode, buf, buflen);
3196 }
3197
3198 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3199 {
3200         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3201
3202         if (buf && buflen < len)
3203                 return -ERANGE;
3204         if (buf)
3205                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3206         return len;
3207 }
3208
3209 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3210         .recover_open   = nfs4_open_reclaim,
3211         .recover_lock   = nfs4_lock_reclaim,
3212 };
3213
3214 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3215         .recover_open   = nfs4_open_expired,
3216         .recover_lock   = nfs4_lock_expired,
3217 };
3218
3219 static struct inode_operations nfs4_file_inode_operations = {
3220         .permission     = nfs_permission,
3221         .getattr        = nfs_getattr,
3222         .setattr        = nfs_setattr,
3223         .getxattr       = nfs4_getxattr,
3224         .setxattr       = nfs4_setxattr,
3225         .listxattr      = nfs4_listxattr,
3226 };
3227
3228 struct nfs_rpc_ops      nfs_v4_clientops = {
3229         .version        = 4,                    /* protocol version */
3230         .dentry_ops     = &nfs4_dentry_operations,
3231         .dir_inode_ops  = &nfs4_dir_inode_operations,
3232         .file_inode_ops = &nfs4_file_inode_operations,
3233         .getroot        = nfs4_proc_get_root,
3234         .getattr        = nfs4_proc_getattr,
3235         .setattr        = nfs4_proc_setattr,
3236         .lookup         = nfs4_proc_lookup,
3237         .access         = nfs4_proc_access,
3238         .readlink       = nfs4_proc_readlink,
3239         .read           = nfs4_proc_read,
3240         .write          = nfs4_proc_write,
3241         .commit         = nfs4_proc_commit,
3242         .create         = nfs4_proc_create,
3243         .remove         = nfs4_proc_remove,
3244         .unlink_setup   = nfs4_proc_unlink_setup,
3245         .unlink_done    = nfs4_proc_unlink_done,
3246         .rename         = nfs4_proc_rename,
3247         .link           = nfs4_proc_link,
3248         .symlink        = nfs4_proc_symlink,
3249         .mkdir          = nfs4_proc_mkdir,
3250         .rmdir          = nfs4_proc_remove,
3251         .readdir        = nfs4_proc_readdir,
3252         .mknod          = nfs4_proc_mknod,
3253         .statfs         = nfs4_proc_statfs,
3254         .fsinfo         = nfs4_proc_fsinfo,
3255         .pathconf       = nfs4_proc_pathconf,
3256         .decode_dirent  = nfs4_decode_dirent,
3257         .read_setup     = nfs4_proc_read_setup,
3258         .write_setup    = nfs4_proc_write_setup,
3259         .commit_setup   = nfs4_proc_commit_setup,
3260         .file_open      = nfs_open,
3261         .file_release   = nfs_release,
3262         .lock           = nfs4_proc_lock,
3263         .clear_acl_cache = nfs4_zap_acl_attr,
3264 };
3265
3266 /*
3267  * Local variables:
3268  *  c-basic-offset: 8
3269  * End:
3270  */