fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54
  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,
 199                 const struct rpc_call_ops *tk_ops, void *calldata)
 200 {
 201         struct rpc_task *task;
 202
 203         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 204                 return -ENOMEM;
 205         rpc_execute(task);
 206         return 0;
 207 }
 208
 209 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 210 {
 211         struct inode *inode = state->inode;
 212
 213         open_flags &= (FMODE_READ|FMODE_WRITE);
 214         /* Protect against nfs4_find_state_byowner() */
 215         spin_lock(&state->owner->so_lock);
 216         spin_lock(&inode->i_lock);
 217         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 218         if ((open_flags & FMODE_WRITE))
 219                 state->nwriters++;
 220         if (open_flags & FMODE_READ)
 221                 state->nreaders++;
 222         nfs4_state_set_mode_locked(state, state->state | open_flags);
 223         spin_unlock(&inode->i_lock);
 224         spin_unlock(&state->owner->so_lock);
 225 }
 226
 227 /*
 228  * OPEN_RECLAIM:
 229  *      reclaim state on the server after a reboot.
 230  */
 231 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 232 {
 233         struct inode *inode = state->inode;
 234         struct nfs_server *server = NFS_SERVER(inode);
 235         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 236         struct nfs_openargs o_arg = {
 237                 .fh = NFS_FH(inode),
 238                 .id = sp->so_id,
 239                 .open_flags = state->state,
 240                 .clientid = server->nfs4_state->cl_clientid,
 241                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 242                 .bitmask = server->attr_bitmask,
 243         };
 244         struct nfs_openres o_res = {
 245                 .server = server,       /* Grrr */
 246         };
 247         struct rpc_message msg = {
 248                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 249                 .rpc_argp       = &o_arg,
 250                 .rpc_resp       = &o_res,
 251                 .rpc_cred       = sp->so_cred,
 252         };
 253         int status;
 254
 255         if (delegation != NULL) {
 256                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 257                         memcpy(&state->stateid, &delegation->stateid,
 258                                         sizeof(state->stateid));
 259                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 260                         return 0;
 261                 }
 262                 o_arg.u.delegation_type = delegation->type;
 263         }
 264         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 265         if (o_arg.seqid == NULL)
 266                 return -ENOMEM;
 267         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 268         /* Confirm the sequence as being established */
 269         nfs_confirm_seqid(&sp->so_seqid, status);
 270         nfs_increment_open_seqid(status, o_arg.seqid);
 271         if (status == 0) {
 272                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 273                 if (o_res.delegation_type != 0) {
 274                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 275                         /* Did the server issue an immediate delegation recall? */
 276                         if (o_res.do_recall)
 277                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 278                 }
 279         }
 280         nfs_free_seqid(o_arg.seqid);
 281         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 282         /* Ensure we update the inode attributes */
 283         NFS_CACHEINV(inode);
 284         return status;
 285 }
 286
 287 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 288 {
 289         struct nfs_server *server = NFS_SERVER(state->inode);
 290         struct nfs4_exception exception = { };
 291         int err;
 292         do {
 293                 err = _nfs4_open_reclaim(sp, state);
 294                 if (err != -NFS4ERR_DELAY)
 295                         break;
 296                 nfs4_handle_exception(server, err, &exception);
 297         } while (exception.retry);
 298         return err;
 299 }
 300
 301 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 302 {
 303         struct nfs4_state_owner  *sp  = state->owner;
 304         struct inode *inode = dentry->d_inode;
 305         struct nfs_server *server = NFS_SERVER(inode);
 306         struct dentry *parent = dget_parent(dentry);
 307         struct nfs_openargs arg = {
 308                 .fh = NFS_FH(parent->d_inode),
 309                 .clientid = server->nfs4_state->cl_clientid,
 310                 .name = &dentry->d_name,
 311                 .id = sp->so_id,
 312                 .server = server,
 313                 .bitmask = server->attr_bitmask,
 314                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 315         };
 316         struct nfs_openres res = {
 317                 .server = server,
 318         };
 319         struct  rpc_message msg = {
 320                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 321                 .rpc_argp       = &arg,
 322                 .rpc_resp       = &res,
 323                 .rpc_cred       = sp->so_cred,
 324         };
 325         int status = 0;
 326
 327         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 328                 goto out;
 329         if (state->state == 0)
 330                 goto out;
 331         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 332         status = -ENOMEM;
 333         if (arg.seqid == NULL)
 334                 goto out;
 335         arg.open_flags = state->state;
 336         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 337         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 338         nfs_increment_open_seqid(status, arg.seqid);
 339         if (status != 0)
 340                 goto out_free;
 341         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 342                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 343                                 sp, &res.stateid, arg.seqid);
 344                 if (status != 0)
 345                         goto out_free;
 346         }
 347         nfs_confirm_seqid(&sp->so_seqid, 0);
 348         if (status >= 0) {
 349                 memcpy(state->stateid.data, res.stateid.data,
 350                                 sizeof(state->stateid.data));
 351                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 352         }
 353 out_free:
 354         nfs_free_seqid(arg.seqid);
 355 out:
 356         dput(parent);
 357         return status;
 358 }
 359
 360 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 361 {
 362         struct nfs4_exception exception = { };
 363         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 364         int err;
 365         do {
 366                 err = _nfs4_open_delegation_recall(dentry, state);
 367                 switch (err) {
 368                         case 0:
 369                                 return err;
 370                         case -NFS4ERR_STALE_CLIENTID:
 371                         case -NFS4ERR_STALE_STATEID:
 372                         case -NFS4ERR_EXPIRED:
 373                                 /* Don't recall a delegation if it was lost */
 374                                 nfs4_schedule_state_recovery(server->nfs4_state);
 375                                 return err;
 376                 }
 377                 err = nfs4_handle_exception(server, err, &exception);
 378         } while (exception.retry);
 379         return err;
 380 }
 381
 382 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)
 383 {
 384         struct nfs_open_confirmargs arg = {
 385                 .fh             = fh,
 386                 .seqid          = seqid,
 387                 .stateid        = *stateid,
 388         };
 389         struct nfs_open_confirmres res;
 390         struct  rpc_message msg = {
 391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 392                 .rpc_argp       = &arg,
 393                 .rpc_resp       = &res,
 394                 .rpc_cred       = sp->so_cred,
 395         };
 396         int status;
 397
 398         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 399         /* Confirm the sequence as being established */
 400         nfs_confirm_seqid(&sp->so_seqid, status);
 401         nfs_increment_open_seqid(status, seqid);
 402         if (status >= 0)
 403                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 404         return status;
 405 }
 406
 407 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 408 {
 409         struct nfs_server *server = NFS_SERVER(dir);
 410         struct rpc_message msg = {
 411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 412                 .rpc_argp = o_arg,
 413                 .rpc_resp = o_res,
 414                 .rpc_cred = sp->so_cred,
 415         };
 416         int status;
 417
 418         /* Update sequence id. The caller must serialize! */
 419         o_arg->id = sp->so_id;
 420         o_arg->clientid = sp->so_client->cl_clientid;
 421
 422         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 423         if (status == 0) {
 424                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 425                 switch (o_res->f_attr->mode & S_IFMT) {
 426                         case S_IFREG:
 427                                 break;
 428                         case S_IFLNK:
 429                                 status = -ELOOP;
 430                                 break;
 431                         case S_IFDIR:
 432                                 status = -EISDIR;
 433                                 break;
 434                         default:
 435                                 status = -ENOTDIR;
 436                 }
 437         }
 438
 439         nfs_increment_open_seqid(status, o_arg->seqid);
 440         if (status != 0)
 441                 goto out;
 442         if (o_arg->open_flags & O_CREAT) {
 443                 update_changeattr(dir, &o_res->cinfo);
 444                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 445         } else
 446                 nfs_refresh_inode(dir, o_res->dir_attr);
 447         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 448                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 449                                 sp, &o_res->stateid, o_arg->seqid);
 450                 if (status != 0)
 451                         goto out;
 452         }
 453         nfs_confirm_seqid(&sp->so_seqid, 0);
 454         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 455                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 456 out:
 457         return status;
 458 }
 459
 460 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 461 {
 462         struct nfs_access_entry cache;
 463         int mask = 0;
 464         int status;
 465
 466         if (openflags & FMODE_READ)
 467                 mask |= MAY_READ;
 468         if (openflags & FMODE_WRITE)
 469                 mask |= MAY_WRITE;
 470         status = nfs_access_get_cached(inode, cred, &cache);
 471         if (status == 0)
 472                 goto out;
 473
 474         /* Be clever: ask server to check for all possible rights */
 475         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 476         cache.cred = cred;
 477         cache.jiffies = jiffies;
 478         status = _nfs4_proc_access(inode, &cache);
 479         if (status != 0)
 480                 return status;
 481         nfs_access_add_cache(inode, &cache);
 482 out:
 483         if ((cache.mask & mask) == mask)
 484                 return 0;
 485         return -EACCES;
 486 }
 487
 488 /*
 489  * OPEN_EXPIRED:
 490  *      reclaim state on the server after a network partition.
 491  *      Assumes caller holds the appropriate lock
 492  */
 493 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 494 {
 495         struct dentry *parent = dget_parent(dentry);
 496         struct inode *dir = parent->d_inode;
 497         struct inode *inode = state->inode;
 498         struct nfs_server *server = NFS_SERVER(dir);
 499         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 500         struct nfs_fattr f_attr, dir_attr;
 501         struct nfs_openargs o_arg = {
 502                 .fh = NFS_FH(dir),
 503                 .open_flags = state->state,
 504                 .name = &dentry->d_name,
 505                 .bitmask = server->attr_bitmask,
 506                 .claim = NFS4_OPEN_CLAIM_NULL,
 507         };
 508         struct nfs_openres o_res = {
 509                 .f_attr = &f_attr,
 510                 .dir_attr = &dir_attr,
 511                 .server = server,
 512         };
 513         int status = 0;
 514
 515         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 516                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 517                 if (status < 0)
 518                         goto out;
 519                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 520                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 521                 goto out;
 522         }
 523         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 524         status = -ENOMEM;
 525         if (o_arg.seqid == NULL)
 526                 goto out;
 527         nfs_fattr_init(&f_attr);
 528         nfs_fattr_init(&dir_attr);
 529         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 530         if (status != 0)
 531                 goto out_nodeleg;
 532         /* Check if files differ */
 533         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 534                 goto out_stale;
 535         /* Has the file handle changed? */
 536         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 537                 /* Verify if the change attributes are the same */
 538                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 539                         goto out_stale;
 540                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 541                         goto out_stale;
 542                 /* Lets just pretend that this is the same file */
 543                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 544                 NFS_I(inode)->fileid = f_attr.fileid;
 545         }
 546         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 547         if (o_res.delegation_type != 0) {
 548                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 549                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 550                 else
 551                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 552         }
 553 out_nodeleg:
 554         nfs_free_seqid(o_arg.seqid);
 555         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 556 out:
 557         dput(parent);
 558         return status;
 559 out_stale:
 560         status = -ESTALE;
 561         /* Invalidate the state owner so we don't ever use it again */
 562         nfs4_drop_state_owner(sp);
 563         d_drop(dentry);
 564         /* Should we be trying to close that stateid? */
 565         goto out_nodeleg;
 566 }
 567
 568 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 569 {
 570         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 571         struct nfs4_exception exception = { };
 572         int err;
 573
 574         do {
 575                 err = _nfs4_open_expired(sp, state, dentry);
 576                 if (err == -NFS4ERR_DELAY)
 577                         nfs4_handle_exception(server, err, &exception);
 578         } while (exception.retry);
 579         return err;
 580 }
 581
 582 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 583 {
 584         struct nfs_inode *nfsi = NFS_I(state->inode);
 585         struct nfs_open_context *ctx;
 586         int status;
 587
 588         spin_lock(&state->inode->i_lock);
 589         list_for_each_entry(ctx, &nfsi->open_files, list) {
 590                 if (ctx->state != state)
 591                         continue;
 592                 get_nfs_open_context(ctx);
 593                 spin_unlock(&state->inode->i_lock);
 594                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 595                 put_nfs_open_context(ctx);
 596                 return status;
 597         }
 598         spin_unlock(&state->inode->i_lock);
 599         return -ENOENT;
 600 }
 601
 602 /*
 603  * Returns an nfs4_state + an extra reference to the inode
 604  */
 605 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 606 {
 607         struct nfs_delegation *delegation;
 608         struct nfs_server *server = NFS_SERVER(inode);
 609         struct nfs4_client *clp = server->nfs4_state;
 610         struct nfs_inode *nfsi = NFS_I(inode);
 611         struct nfs4_state_owner *sp = NULL;
 612         struct nfs4_state *state = NULL;
 613         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 614         int err;
 615
 616         /* Protect against reboot recovery - NOTE ORDER! */
 617         down_read(&clp->cl_sem);
 618         /* Protect against delegation recall */
 619         down_read(&nfsi->rwsem);
 620         delegation = NFS_I(inode)->delegation;
 621         err = -ENOENT;
 622         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 623                 goto out_err;
 624         err = -ENOMEM;
 625         if (!(sp = nfs4_get_state_owner(server, cred))) {
 626                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 627                 goto out_err;
 628         }
 629         state = nfs4_get_open_state(inode, sp);
 630         if (state == NULL)
 631                 goto out_err;
 632
 633         err = -ENOENT;
 634         if ((state->state & open_flags) == open_flags) {
 635                 spin_lock(&inode->i_lock);
 636                 if (open_flags & FMODE_READ)
 637                         state->nreaders++;
 638                 if (open_flags & FMODE_WRITE)
 639                         state->nwriters++;
 640                 spin_unlock(&inode->i_lock);
 641                 goto out_ok;
 642         } else if (state->state != 0)
 643                 goto out_err;
 644
 645         lock_kernel();
 646         err = _nfs4_do_access(inode, cred, open_flags);
 647         unlock_kernel();
 648         if (err != 0)
 649                 goto out_err;
 650         set_bit(NFS_DELEGATED_STATE, &state->flags);
 651         update_open_stateid(state, &delegation->stateid, open_flags);
 652 out_ok:
 653         nfs4_put_state_owner(sp);
 654         up_read(&nfsi->rwsem);
 655         up_read(&clp->cl_sem);
 656         igrab(inode);
 657         *res = state;
 658         return 0;
 659 out_err:
 660         if (sp != NULL) {
 661                 if (state != NULL)
 662                         nfs4_put_open_state(state);
 663                 nfs4_put_state_owner(sp);
 664         }
 665         up_read(&nfsi->rwsem);
 666         up_read(&clp->cl_sem);
 667         if (err != -EACCES)
 668                 nfs_inode_return_delegation(inode);
 669         return err;
 670 }
 671
 672 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 673 {
 674         struct nfs4_exception exception = { };
 675         struct nfs4_state *res;
 676         int err;
 677
 678         do {
 679                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 680                 if (err == 0)
 681                         break;
 682                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 683                                         err, &exception));
 684         } while (exception.retry);
 685         return res;
 686 }
 687
 688 /*
 689  * Returns an nfs4_state + an referenced inode
 690  */
 691 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 692 {
 693         struct nfs4_state_owner  *sp;
 694         struct nfs4_state     *state = NULL;
 695         struct nfs_server       *server = NFS_SERVER(dir);
 696         struct nfs4_client *clp = server->nfs4_state;
 697         struct inode *inode = NULL;
 698         int                     status;
 699         struct nfs_fattr f_attr, dir_attr;
 700         struct nfs_openargs o_arg = {
 701                 .fh             = NFS_FH(dir),
 702                 .open_flags     = flags,
 703                 .name           = &dentry->d_name,
 704                 .server         = server,
 705                 .bitmask = server->attr_bitmask,
 706                 .claim = NFS4_OPEN_CLAIM_NULL,
 707         };
 708         struct nfs_openres o_res = {
 709                 .f_attr         = &f_attr,
 710                 .dir_attr       = &dir_attr,
 711                 .server         = server,
 712         };
 713
 714         /* Protect against reboot recovery conflicts */
 715         down_read(&clp->cl_sem);
 716         status = -ENOMEM;
 717         if (!(sp = nfs4_get_state_owner(server, cred))) {
 718                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 719                 goto out_err;
 720         }
 721         if (flags & O_EXCL) {
 722                 u32 *p = (u32 *) o_arg.u.verifier.data;
 723                 p[0] = jiffies;
 724                 p[1] = current->pid;
 725         } else
 726                 o_arg.u.attrs = sattr;
 727         /* Serialization for the sequence id */
 728
 729         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 730         if (o_arg.seqid == NULL)
 731                 return -ENOMEM;
 732         nfs_fattr_init(&f_attr);
 733         nfs_fattr_init(&dir_attr);
 734         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 735         if (status != 0)
 736                 goto out_err;
 737
 738         status = -ENOMEM;
 739         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 740         if (!inode)
 741                 goto out_err;
 742         state = nfs4_get_open_state(inode, sp);
 743         if (!state)
 744                 goto out_err;
 745         update_open_stateid(state, &o_res.stateid, flags);
 746         if (o_res.delegation_type != 0)
 747                 nfs_inode_set_delegation(inode, cred, &o_res);
 748         nfs_free_seqid(o_arg.seqid);
 749         nfs4_put_state_owner(sp);
 750         up_read(&clp->cl_sem);
 751         *res = state;
 752         return 0;
 753 out_err:
 754         if (sp != NULL) {
 755                 if (state != NULL)
 756                         nfs4_put_open_state(state);
 757                 nfs_free_seqid(o_arg.seqid);
 758                 nfs4_put_state_owner(sp);
 759         }
 760         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 761         up_read(&clp->cl_sem);
 762         if (inode != NULL)
 763                 iput(inode);
 764         *res = NULL;
 765         return status;
 766 }
 767
 768
 769 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 770 {
 771         struct nfs4_exception exception = { };
 772         struct nfs4_state *res;
 773         int status;
 774
 775         do {
 776                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 777                 if (status == 0)
 778                         break;
 779                 /* NOTE: BAD_SEQID means the server and client disagree about the
 780                  * book-keeping w.r.t. state-changing operations
 781                  * (OPEN/CLOSE/LOCK/LOCKU...)
 782                  * It is actually a sign of a bug on the client or on the server.
 783                  *
 784                  * If we receive a BAD_SEQID error in the particular case of
 785                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 786                  * have unhashed the old state_owner for us, and that we can
 787                  * therefore safely retry using a new one. We should still warn
 788                  * the user though...
 789                  */
 790                 if (status == -NFS4ERR_BAD_SEQID) {
 791                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 792                         exception.retry = 1;
 793                         continue;
 794                 }
 795                 /*
 796                  * BAD_STATEID on OPEN means that the server cancelled our
 797                  * state before it received the OPEN_CONFIRM.
 798                  * Recover by retrying the request as per the discussion
 799                  * on Page 181 of RFC3530.
 800                  */
 801                 if (status == -NFS4ERR_BAD_STATEID) {
 802                         exception.retry = 1;
 803                         continue;
 804                 }
 805                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 806                                         status, &exception));
 807         } while (exception.retry);
 808         return res;
 809 }
 810
 811 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 812                 struct nfs_fh *fhandle, struct iattr *sattr,
 813                 struct nfs4_state *state)
 814 {
 815         struct nfs_setattrargs  arg = {
 816                 .fh             = fhandle,
 817                 .iap            = sattr,
 818                 .server         = server,
 819                 .bitmask = server->attr_bitmask,
 820         };
 821         struct nfs_setattrres  res = {
 822                 .fattr          = fattr,
 823                 .server         = server,
 824         };
 825         struct rpc_message msg = {
 826                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 827                 .rpc_argp       = &arg,
 828                 .rpc_resp       = &res,
 829         };
 830         int status;
 831
 832         nfs_fattr_init(fattr);
 833
 834         if (state != NULL) {
 835                 msg.rpc_cred = state->owner->so_cred;
 836                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 837         } else
 838                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 839
 840         status = rpc_call_sync(server->client, &msg, 0);
 841         return status;
 842 }
 843
 844 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 845                 struct nfs_fh *fhandle, struct iattr *sattr,
 846                 struct nfs4_state *state)
 847 {
 848         struct nfs4_exception exception = { };
 849         int err;
 850         do {
 851                 err = nfs4_handle_exception(server,
 852                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 853                                         state),
 854                                 &exception);
 855         } while (exception.retry);
 856         return err;
 857 }
 858
 859 struct nfs4_closedata {
 860         struct inode *inode;
 861         struct nfs4_state *state;
 862         struct nfs_closeargs arg;
 863         struct nfs_closeres res;
 864         struct nfs_fattr fattr;
 865 };
 866
 867 static void nfs4_free_closedata(void *data)
 868 {
 869         struct nfs4_closedata *calldata = data;
 870         struct nfs4_state_owner *sp = calldata->state->owner;
 871
 872         nfs4_put_open_state(calldata->state);
 873         nfs_free_seqid(calldata->arg.seqid);
 874         nfs4_put_state_owner(sp);
 875         kfree(calldata);
 876 }
 877
 878 static void nfs4_close_done(struct rpc_task *task, void *data)
 879 {
 880         struct nfs4_closedata *calldata = data;
 881         struct nfs4_state *state = calldata->state;
 882         struct nfs_server *server = NFS_SERVER(calldata->inode);
 883
 884         if (RPC_ASSASSINATED(task))
 885                 return;
 886         /* hmm. we are done with the inode, and in the process of freeing
 887          * the state_owner. we keep this around to process errors
 888          */
 889         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 890         switch (task->tk_status) {
 891                 case 0:
 892                         memcpy(&state->stateid, &calldata->res.stateid,
 893                                         sizeof(state->stateid));
 894                         break;
 895                 case -NFS4ERR_STALE_STATEID:
 896                 case -NFS4ERR_EXPIRED:
 897                         nfs4_schedule_state_recovery(server->nfs4_state);
 898                         break;
 899                 default:
 900                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 901                                 rpc_restart_call(task);
 902                                 return;
 903                         }
 904         }
 905         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
 906 }
 907
 908 static void nfs4_close_prepare(struct rpc_task *task, void *data)
 909 {
 910         struct nfs4_closedata *calldata = data;
 911         struct nfs4_state *state = calldata->state;
 912         struct rpc_message msg = {
 913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 914                 .rpc_argp = &calldata->arg,
 915                 .rpc_resp = &calldata->res,
 916                 .rpc_cred = state->owner->so_cred,
 917         };
 918         int mode = 0, old_mode;
 919
 920         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
 921                 return;
 922         /* Recalculate the new open mode in case someone reopened the file
 923          * while we were waiting in line to be scheduled.
 924          */
 925         spin_lock(&state->owner->so_lock);
 926         spin_lock(&calldata->inode->i_lock);
 927         mode = old_mode = state->state;
 928         if (state->nreaders == 0)
 929                 mode &= ~FMODE_READ;
 930         if (state->nwriters == 0)
 931                 mode &= ~FMODE_WRITE;
 932         nfs4_state_set_mode_locked(state, mode);
 933         spin_unlock(&calldata->inode->i_lock);
 934         spin_unlock(&state->owner->so_lock);
 935         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
 936                 /* Note: exit _without_ calling nfs4_close_done */
 937                 task->tk_action = NULL;
 938                 return;
 939         }
 940         nfs_fattr_init(calldata->res.fattr);
 941         if (mode != 0)
 942                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 943         calldata->arg.open_flags = mode;
 944         rpc_call_setup(task, &msg, 0);
 945 }
 946
 947 static const struct rpc_call_ops nfs4_close_ops = {
 948         .rpc_call_prepare = nfs4_close_prepare,
 949         .rpc_call_done = nfs4_close_done,
 950         .rpc_release = nfs4_free_closedata,
 951 };
 952
 953 /*
 954  * It is possible for data to be read/written from a mem-mapped file
 955  * after the sys_close call (which hits the vfs layer as a flush).
 956  * This means that we can't safely call nfsv4 close on a file until
 957  * the inode is cleared. This in turn means that we are not good
 958  * NFSv4 citizens - we do not indicate to the server to update the file's
 959  * share state even when we are done with one of the three share
 960  * stateid's in the inode.
 961  *
 962  * NOTE: Caller must be holding the sp->so_owner semaphore!
 963  */
 964 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
 965 {
 966         struct nfs_server *server = NFS_SERVER(inode);
 967         struct nfs4_closedata *calldata;
 968         int status = -ENOMEM;
 969
 970         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 971         if (calldata == NULL)
 972                 goto out;
 973         calldata->inode = inode;
 974         calldata->state = state;
 975         calldata->arg.fh = NFS_FH(inode);
 976         calldata->arg.stateid = &state->stateid;
 977         /* Serialization for the sequence id */
 978         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 979         if (calldata->arg.seqid == NULL)
 980                 goto out_free_calldata;
 981         calldata->arg.bitmask = server->attr_bitmask;
 982         calldata->res.fattr = &calldata->fattr;
 983         calldata->res.server = server;
 984
 985         status = nfs4_call_async(server->client, &nfs4_close_ops, 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         wdata->args.bitmask = server->attr_bitmask;
1510         wdata->res.server = server;
1511         nfs_fattr_init(fattr);
1512         status = rpc_call_sync(server->client, &msg, rpcflags);
1513         dprintk("NFS reply write: %d\n", status);
1514         if (status < 0)
1515                 return status;
1516         nfs_post_op_update_inode(inode, fattr);
1517         return wdata->res.count;
1518 }
1519
1520 static int nfs4_proc_write(struct nfs_write_data *wdata)
1521 {
1522         struct nfs4_exception exception = { };
1523         int err;
1524         do {
1525                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1526                                 _nfs4_proc_write(wdata),
1527                                 &exception);
1528         } while (exception.retry);
1529         return err;
1530 }
1531
1532 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1533 {
1534         struct inode *inode = cdata->inode;
1535         struct nfs_fattr *fattr = cdata->res.fattr;
1536         struct nfs_server *server = NFS_SERVER(inode);
1537         struct rpc_message msg = {
1538                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1539                 .rpc_argp       = &cdata->args,
1540                 .rpc_resp       = &cdata->res,
1541                 .rpc_cred       = cdata->cred,
1542         };
1543         int status;
1544
1545         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1546                         (long long) cdata->args.offset);
1547
1548         cdata->args.bitmask = server->attr_bitmask;
1549         cdata->res.server = server;
1550         nfs_fattr_init(fattr);
1551         status = rpc_call_sync(server->client, &msg, 0);
1552         dprintk("NFS reply commit: %d\n", status);
1553         if (status >= 0)
1554                 nfs_post_op_update_inode(inode, fattr);
1555         return status;
1556 }
1557
1558 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1559 {
1560         struct nfs4_exception exception = { };
1561         int err;
1562         do {
1563                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1564                                 _nfs4_proc_commit(cdata),
1565                                 &exception);
1566         } while (exception.retry);
1567         return err;
1568 }
1569
1570 /*
1571  * Got race?
1572  * We will need to arrange for the VFS layer to provide an atomic open.
1573  * Until then, this create/open method is prone to inefficiency and race
1574  * conditions due to the lookup, create, and open VFS calls from sys_open()
1575  * placed on the wire.
1576  *
1577  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1578  * The file will be opened again in the subsequent VFS open call
1579  * (nfs4_proc_file_open).
1580  *
1581  * The open for read will just hang around to be used by any process that
1582  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1583  */
1584
1585 static int
1586 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1587                  int flags, struct nameidata *nd)
1588 {
1589         struct nfs4_state *state;
1590         struct rpc_cred *cred;
1591         int status = 0;
1592
1593         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1594         if (IS_ERR(cred)) {
1595                 status = PTR_ERR(cred);
1596                 goto out;
1597         }
1598         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1599         put_rpccred(cred);
1600         if (IS_ERR(state)) {
1601                 status = PTR_ERR(state);
1602                 goto out;
1603         }
1604         d_instantiate(dentry, state->inode);
1605         if (flags & O_EXCL) {
1606                 struct nfs_fattr fattr;
1607                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1608                                      NFS_FH(state->inode), sattr, state);
1609                 if (status == 0)
1610                         nfs_setattr_update_inode(state->inode, sattr);
1611         }
1612         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1613                 nfs4_intent_set_file(nd, dentry, state);
1614         else
1615                 nfs4_close_state(state, flags);
1616 out:
1617         return status;
1618 }
1619
1620 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1621 {
1622         struct nfs_server *server = NFS_SERVER(dir);
1623         struct nfs4_remove_arg args = {
1624                 .fh = NFS_FH(dir),
1625                 .name = name,
1626                 .bitmask = server->attr_bitmask,
1627         };
1628         struct nfs_fattr dir_attr;
1629         struct nfs4_remove_res  res = {
1630                 .server = server,
1631                 .dir_attr = &dir_attr,
1632         };
1633         struct rpc_message msg = {
1634                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1635                 .rpc_argp       = &args,
1636                 .rpc_resp       = &res,
1637         };
1638         int                     status;
1639
1640         nfs_fattr_init(res.dir_attr);
1641         status = rpc_call_sync(server->client, &msg, 0);
1642         if (status == 0) {
1643                 update_changeattr(dir, &res.cinfo);
1644                 nfs_post_op_update_inode(dir, res.dir_attr);
1645         }
1646         return status;
1647 }
1648
1649 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1650 {
1651         struct nfs4_exception exception = { };
1652         int err;
1653         do {
1654                 err = nfs4_handle_exception(NFS_SERVER(dir),
1655                                 _nfs4_proc_remove(dir, name),
1656                                 &exception);
1657         } while (exception.retry);
1658         return err;
1659 }
1660
1661 struct unlink_desc {
1662         struct nfs4_remove_arg  args;
1663         struct nfs4_remove_res  res;
1664         struct nfs_fattr dir_attr;
1665 };
1666
1667 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1668                 struct qstr *name)
1669 {
1670         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1671         struct unlink_desc *up;
1672
1673         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1674         if (!up)
1675                 return -ENOMEM;
1676
1677         up->args.fh = NFS_FH(dir->d_inode);
1678         up->args.name = name;
1679         up->args.bitmask = server->attr_bitmask;
1680         up->res.server = server;
1681         up->res.dir_attr = &up->dir_attr;
1682
1683         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1684         msg->rpc_argp = &up->args;
1685         msg->rpc_resp = &up->res;
1686         return 0;
1687 }
1688
1689 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1690 {
1691         struct rpc_message *msg = &task->tk_msg;
1692         struct unlink_desc *up;
1693
1694         if (msg->rpc_resp != NULL) {
1695                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1696                 update_changeattr(dir->d_inode, &up->res.cinfo);
1697                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1698                 kfree(up);
1699                 msg->rpc_resp = NULL;
1700                 msg->rpc_argp = NULL;
1701         }
1702         return 0;
1703 }
1704
1705 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1706                 struct inode *new_dir, struct qstr *new_name)
1707 {
1708         struct nfs_server *server = NFS_SERVER(old_dir);
1709         struct nfs4_rename_arg arg = {
1710                 .old_dir = NFS_FH(old_dir),
1711                 .new_dir = NFS_FH(new_dir),
1712                 .old_name = old_name,
1713                 .new_name = new_name,
1714                 .bitmask = server->attr_bitmask,
1715         };
1716         struct nfs_fattr old_fattr, new_fattr;
1717         struct nfs4_rename_res res = {
1718                 .server = server,
1719                 .old_fattr = &old_fattr,
1720                 .new_fattr = &new_fattr,
1721         };
1722         struct rpc_message msg = {
1723                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1724                 .rpc_argp = &arg,
1725                 .rpc_resp = &res,
1726         };
1727         int                     status;
1728
1729         nfs_fattr_init(res.old_fattr);
1730         nfs_fattr_init(res.new_fattr);
1731         status = rpc_call_sync(server->client, &msg, 0);
1732
1733         if (!status) {
1734                 update_changeattr(old_dir, &res.old_cinfo);
1735                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1736                 update_changeattr(new_dir, &res.new_cinfo);
1737                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1738         }
1739         return status;
1740 }
1741
1742 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1743                 struct inode *new_dir, struct qstr *new_name)
1744 {
1745         struct nfs4_exception exception = { };
1746         int err;
1747         do {
1748                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1749                                 _nfs4_proc_rename(old_dir, old_name,
1750                                         new_dir, new_name),
1751                                 &exception);
1752         } while (exception.retry);
1753         return err;
1754 }
1755
1756 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1757 {
1758         struct nfs_server *server = NFS_SERVER(inode);
1759         struct nfs4_link_arg arg = {
1760                 .fh     = NFS_FH(inode),
1761                 .dir_fh = NFS_FH(dir),
1762                 .name   = name,
1763                 .bitmask = server->attr_bitmask,
1764         };
1765         struct nfs_fattr fattr, dir_attr;
1766         struct nfs4_link_res res = {
1767                 .server = server,
1768                 .fattr = &fattr,
1769                 .dir_attr = &dir_attr,
1770         };
1771         struct rpc_message msg = {
1772                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1773                 .rpc_argp = &arg,
1774                 .rpc_resp = &res,
1775         };
1776         int                     status;
1777
1778         nfs_fattr_init(res.fattr);
1779         nfs_fattr_init(res.dir_attr);
1780         status = rpc_call_sync(server->client, &msg, 0);
1781         if (!status) {
1782                 update_changeattr(dir, &res.cinfo);
1783                 nfs_post_op_update_inode(dir, res.dir_attr);
1784                 nfs_refresh_inode(inode, res.fattr);
1785         }
1786
1787         return status;
1788 }
1789
1790 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1791 {
1792         struct nfs4_exception exception = { };
1793         int err;
1794         do {
1795                 err = nfs4_handle_exception(NFS_SERVER(inode),
1796                                 _nfs4_proc_link(inode, dir, name),
1797                                 &exception);
1798         } while (exception.retry);
1799         return err;
1800 }
1801
1802 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1803                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1804                 struct nfs_fattr *fattr)
1805 {
1806         struct nfs_server *server = NFS_SERVER(dir);
1807         struct nfs_fattr dir_fattr;
1808         struct nfs4_create_arg arg = {
1809                 .dir_fh = NFS_FH(dir),
1810                 .server = server,
1811                 .name = name,
1812                 .attrs = sattr,
1813                 .ftype = NF4LNK,
1814                 .bitmask = server->attr_bitmask,
1815         };
1816         struct nfs4_create_res res = {
1817                 .server = server,
1818                 .fh = fhandle,
1819                 .fattr = fattr,
1820                 .dir_fattr = &dir_fattr,
1821         };
1822         struct rpc_message msg = {
1823                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1824                 .rpc_argp = &arg,
1825                 .rpc_resp = &res,
1826         };
1827         int                     status;
1828
1829         if (path->len > NFS4_MAXPATHLEN)
1830                 return -ENAMETOOLONG;
1831         arg.u.symlink = path;
1832         nfs_fattr_init(fattr);
1833         nfs_fattr_init(&dir_fattr);
1834
1835         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1836         if (!status)
1837                 update_changeattr(dir, &res.dir_cinfo);
1838         nfs_post_op_update_inode(dir, res.dir_fattr);
1839         return status;
1840 }
1841
1842 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1843                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1844                 struct nfs_fattr *fattr)
1845 {
1846         struct nfs4_exception exception = { };
1847         int err;
1848         do {
1849                 err = nfs4_handle_exception(NFS_SERVER(dir),
1850                                 _nfs4_proc_symlink(dir, name, path, sattr,
1851                                         fhandle, fattr),
1852                                 &exception);
1853         } while (exception.retry);
1854         return err;
1855 }
1856
1857 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1858                 struct iattr *sattr)
1859 {
1860         struct nfs_server *server = NFS_SERVER(dir);
1861         struct nfs_fh fhandle;
1862         struct nfs_fattr fattr, dir_fattr;
1863         struct nfs4_create_arg arg = {
1864                 .dir_fh = NFS_FH(dir),
1865                 .server = server,
1866                 .name = &dentry->d_name,
1867                 .attrs = sattr,
1868                 .ftype = NF4DIR,
1869                 .bitmask = server->attr_bitmask,
1870         };
1871         struct nfs4_create_res res = {
1872                 .server = server,
1873                 .fh = &fhandle,
1874                 .fattr = &fattr,
1875                 .dir_fattr = &dir_fattr,
1876         };
1877         struct rpc_message msg = {
1878                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1879                 .rpc_argp = &arg,
1880                 .rpc_resp = &res,
1881         };
1882         int                     status;
1883
1884         nfs_fattr_init(&fattr);
1885         nfs_fattr_init(&dir_fattr);
1886
1887         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1888         if (!status) {
1889                 update_changeattr(dir, &res.dir_cinfo);
1890                 nfs_post_op_update_inode(dir, res.dir_fattr);
1891                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1892         }
1893         return status;
1894 }
1895
1896 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1897                 struct iattr *sattr)
1898 {
1899         struct nfs4_exception exception = { };
1900         int err;
1901         do {
1902                 err = nfs4_handle_exception(NFS_SERVER(dir),
1903                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1904                                 &exception);
1905         } while (exception.retry);
1906         return err;
1907 }
1908
1909 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1910                   u64 cookie, struct page *page, unsigned int count, int plus)
1911 {
1912         struct inode            *dir = dentry->d_inode;
1913         struct nfs4_readdir_arg args = {
1914                 .fh = NFS_FH(dir),
1915                 .pages = &page,
1916                 .pgbase = 0,
1917                 .count = count,
1918                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1919         };
1920         struct nfs4_readdir_res res;
1921         struct rpc_message msg = {
1922                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1923                 .rpc_argp = &args,
1924                 .rpc_resp = &res,
1925                 .rpc_cred = cred,
1926         };
1927         int                     status;
1928
1929         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1930                         dentry->d_parent->d_name.name,
1931                         dentry->d_name.name,
1932                         (unsigned long long)cookie);
1933         lock_kernel();
1934         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1935         res.pgbase = args.pgbase;
1936         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1937         if (status == 0)
1938                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1939         unlock_kernel();
1940         dprintk("%s: returns %d\n", __FUNCTION__, status);
1941         return status;
1942 }
1943
1944 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1945                   u64 cookie, struct page *page, unsigned int count, int plus)
1946 {
1947         struct nfs4_exception exception = { };
1948         int err;
1949         do {
1950                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1951                                 _nfs4_proc_readdir(dentry, cred, cookie,
1952                                         page, count, plus),
1953                                 &exception);
1954         } while (exception.retry);
1955         return err;
1956 }
1957
1958 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1959                 struct iattr *sattr, dev_t rdev)
1960 {
1961         struct nfs_server *server = NFS_SERVER(dir);
1962         struct nfs_fh fh;
1963         struct nfs_fattr fattr, dir_fattr;
1964         struct nfs4_create_arg arg = {
1965                 .dir_fh = NFS_FH(dir),
1966                 .server = server,
1967                 .name = &dentry->d_name,
1968                 .attrs = sattr,
1969                 .bitmask = server->attr_bitmask,
1970         };
1971         struct nfs4_create_res res = {
1972                 .server = server,
1973                 .fh = &fh,
1974                 .fattr = &fattr,
1975                 .dir_fattr = &dir_fattr,
1976         };
1977         struct rpc_message msg = {
1978                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1979                 .rpc_argp = &arg,
1980                 .rpc_resp = &res,
1981         };
1982         int                     status;
1983         int                     mode = sattr->ia_mode;
1984
1985         nfs_fattr_init(&fattr);
1986         nfs_fattr_init(&dir_fattr);
1987
1988         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1989         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1990         if (S_ISFIFO(mode))
1991                 arg.ftype = NF4FIFO;
1992         else if (S_ISBLK(mode)) {
1993                 arg.ftype = NF4BLK;
1994                 arg.u.device.specdata1 = MAJOR(rdev);
1995                 arg.u.device.specdata2 = MINOR(rdev);
1996         }
1997         else if (S_ISCHR(mode)) {
1998                 arg.ftype = NF4CHR;
1999                 arg.u.device.specdata1 = MAJOR(rdev);
2000                 arg.u.device.specdata2 = MINOR(rdev);
2001         }
2002         else
2003                 arg.ftype = NF4SOCK;
2004
2005         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2006         if (status == 0) {
2007                 update_changeattr(dir, &res.dir_cinfo);
2008                 nfs_post_op_update_inode(dir, res.dir_fattr);
2009                 status = nfs_instantiate(dentry, &fh, &fattr);
2010         }
2011         return status;
2012 }
2013
2014 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2015                 struct iattr *sattr, dev_t rdev)
2016 {
2017         struct nfs4_exception exception = { };
2018         int err;
2019         do {
2020                 err = nfs4_handle_exception(NFS_SERVER(dir),
2021                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2022                                 &exception);
2023         } while (exception.retry);
2024         return err;
2025 }
2026
2027 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2028                  struct nfs_fsstat *fsstat)
2029 {
2030         struct nfs4_statfs_arg args = {
2031                 .fh = fhandle,
2032                 .bitmask = server->attr_bitmask,
2033         };
2034         struct rpc_message msg = {
2035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2036                 .rpc_argp = &args,
2037                 .rpc_resp = fsstat,
2038         };
2039
2040         nfs_fattr_init(fsstat->fattr);
2041         return rpc_call_sync(server->client, &msg, 0);
2042 }
2043
2044 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2045 {
2046         struct nfs4_exception exception = { };
2047         int err;
2048         do {
2049                 err = nfs4_handle_exception(server,
2050                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2051                                 &exception);
2052         } while (exception.retry);
2053         return err;
2054 }
2055
2056 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2057                 struct nfs_fsinfo *fsinfo)
2058 {
2059         struct nfs4_fsinfo_arg args = {
2060                 .fh = fhandle,
2061                 .bitmask = server->attr_bitmask,
2062         };
2063         struct rpc_message msg = {
2064                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2065                 .rpc_argp = &args,
2066                 .rpc_resp = fsinfo,
2067         };
2068
2069         return rpc_call_sync(server->client, &msg, 0);
2070 }
2071
2072 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2073 {
2074         struct nfs4_exception exception = { };
2075         int err;
2076
2077         do {
2078                 err = nfs4_handle_exception(server,
2079                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2080                                 &exception);
2081         } while (exception.retry);
2082         return err;
2083 }
2084
2085 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2086 {
2087         nfs_fattr_init(fsinfo->fattr);
2088         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2089 }
2090
2091 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2092                 struct nfs_pathconf *pathconf)
2093 {
2094         struct nfs4_pathconf_arg args = {
2095                 .fh = fhandle,
2096                 .bitmask = server->attr_bitmask,
2097         };
2098         struct rpc_message msg = {
2099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2100                 .rpc_argp = &args,
2101                 .rpc_resp = pathconf,
2102         };
2103
2104         /* None of the pathconf attributes are mandatory to implement */
2105         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2106                 memset(pathconf, 0, sizeof(*pathconf));
2107                 return 0;
2108         }
2109
2110         nfs_fattr_init(pathconf->fattr);
2111         return rpc_call_sync(server->client, &msg, 0);
2112 }
2113
2114 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2115                 struct nfs_pathconf *pathconf)
2116 {
2117         struct nfs4_exception exception = { };
2118         int err;
2119
2120         do {
2121                 err = nfs4_handle_exception(server,
2122                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2123                                 &exception);
2124         } while (exception.retry);
2125         return err;
2126 }
2127
2128 static void nfs4_read_done(struct rpc_task *task, void *calldata)
2129 {
2130         struct nfs_read_data *data = calldata;
2131         struct inode *inode = data->inode;
2132
2133         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2134                 rpc_restart_call(task);
2135                 return;
2136         }
2137         if (task->tk_status > 0)
2138                 renew_lease(NFS_SERVER(inode), data->timestamp);
2139         /* Call back common NFS readpage processing */
2140         nfs_readpage_result(task, calldata);
2141 }
2142
2143 static const struct rpc_call_ops nfs4_read_ops = {
2144         .rpc_call_done = nfs4_read_done,
2145         .rpc_release = nfs_readdata_release,
2146 };
2147
2148 static void
2149 nfs4_proc_read_setup(struct nfs_read_data *data)
2150 {
2151         struct rpc_task *task = &data->task;
2152         struct rpc_message msg = {
2153                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2154                 .rpc_argp = &data->args,
2155                 .rpc_resp = &data->res,
2156                 .rpc_cred = data->cred,
2157         };
2158         struct inode *inode = data->inode;
2159         int flags;
2160
2161         data->timestamp   = jiffies;
2162
2163         /* N.B. Do we need to test? Never called for swapfile inode */
2164         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2165
2166         /* Finalize the task. */
2167         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
2168         rpc_call_setup(task, &msg, 0);
2169 }
2170
2171 static void nfs4_write_done(struct rpc_task *task, void *calldata)
2172 {
2173         struct nfs_write_data *data = calldata;
2174         struct inode *inode = data->inode;
2175
2176         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2177                 rpc_restart_call(task);
2178                 return;
2179         }
2180         if (task->tk_status >= 0) {
2181                 renew_lease(NFS_SERVER(inode), data->timestamp);
2182                 nfs_post_op_update_inode(inode, data->res.fattr);
2183         }
2184         /* Call back common NFS writeback processing */
2185         nfs_writeback_done(task, calldata);
2186 }
2187
2188 static const struct rpc_call_ops nfs4_write_ops = {
2189         .rpc_call_done = nfs4_write_done,
2190         .rpc_release = nfs_writedata_release,
2191 };
2192
2193 static void
2194 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2195 {
2196         struct rpc_task *task = &data->task;
2197         struct rpc_message msg = {
2198                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2199                 .rpc_argp = &data->args,
2200                 .rpc_resp = &data->res,
2201                 .rpc_cred = data->cred,
2202         };
2203         struct inode *inode = data->inode;
2204         struct nfs_server *server = NFS_SERVER(inode);
2205         int stable;
2206         int flags;
2207
2208         if (how & FLUSH_STABLE) {
2209                 if (!NFS_I(inode)->ncommit)
2210                         stable = NFS_FILE_SYNC;
2211                 else
2212                         stable = NFS_DATA_SYNC;
2213         } else
2214                 stable = NFS_UNSTABLE;
2215         data->args.stable = stable;
2216         data->args.bitmask = server->attr_bitmask;
2217         data->res.server = server;
2218
2219         data->timestamp   = jiffies;
2220
2221         /* Set the initial flags for the task.  */
2222         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2223
2224         /* Finalize the task. */
2225         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_write_ops, data);
2226         rpc_call_setup(task, &msg, 0);
2227 }
2228
2229 static void nfs4_commit_done(struct rpc_task *task, void *calldata)
2230 {
2231         struct nfs_write_data *data = calldata;
2232         struct inode *inode = data->inode;
2233
2234         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2235                 rpc_restart_call(task);
2236                 return;
2237         }
2238         if (task->tk_status >= 0)
2239                 nfs_post_op_update_inode(inode, data->res.fattr);
2240         /* Call back common NFS writeback processing */
2241         nfs_commit_done(task, calldata);
2242 }
2243
2244 static const struct rpc_call_ops nfs4_commit_ops = {
2245         .rpc_call_done = nfs4_commit_done,
2246         .rpc_release = nfs_commit_release,
2247 };
2248
2249 static void
2250 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2251 {
2252         struct rpc_task *task = &data->task;
2253         struct rpc_message msg = {
2254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2255                 .rpc_argp = &data->args,
2256                 .rpc_resp = &data->res,
2257                 .rpc_cred = data->cred,
2258         };
2259         struct inode *inode = data->inode;
2260         struct nfs_server *server = NFS_SERVER(inode);
2261         int flags;
2262
2263         data->args.bitmask = server->attr_bitmask;
2264         data->res.server = server;
2265
2266         /* Set the initial flags for the task.  */
2267         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2268
2269         /* Finalize the task. */
2270         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_commit_ops, data);
2271         rpc_call_setup(task, &msg, 0);
2272 }
2273
2274 /*
2275  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2276  * standalone procedure for queueing an asynchronous RENEW.
2277  */
2278 static void nfs4_renew_done(struct rpc_task *task, void *data)
2279 {
2280         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2281         unsigned long timestamp = (unsigned long)data;
2282
2283         if (task->tk_status < 0) {
2284                 switch (task->tk_status) {
2285                         case -NFS4ERR_STALE_CLIENTID:
2286                         case -NFS4ERR_EXPIRED:
2287                         case -NFS4ERR_CB_PATH_DOWN:
2288                                 nfs4_schedule_state_recovery(clp);
2289                 }
2290                 return;
2291         }
2292         spin_lock(&clp->cl_lock);
2293         if (time_before(clp->cl_last_renewal,timestamp))
2294                 clp->cl_last_renewal = timestamp;
2295         spin_unlock(&clp->cl_lock);
2296 }
2297
2298 static const struct rpc_call_ops nfs4_renew_ops = {
2299         .rpc_call_done = nfs4_renew_done,
2300 };
2301
2302 int
2303 nfs4_proc_async_renew(struct nfs4_client *clp)
2304 {
2305         struct rpc_message msg = {
2306                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2307                 .rpc_argp       = clp,
2308                 .rpc_cred       = clp->cl_cred,
2309         };
2310
2311         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2312                         &nfs4_renew_ops, (void *)jiffies);
2313 }
2314
2315 int
2316 nfs4_proc_renew(struct nfs4_client *clp)
2317 {
2318         struct rpc_message msg = {
2319                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2320                 .rpc_argp       = clp,
2321                 .rpc_cred       = clp->cl_cred,
2322         };
2323         unsigned long now = jiffies;
2324         int status;
2325
2326         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2327         if (status < 0)
2328                 return status;
2329         spin_lock(&clp->cl_lock);
2330         if (time_before(clp->cl_last_renewal,now))
2331                 clp->cl_last_renewal = now;
2332         spin_unlock(&clp->cl_lock);
2333         return 0;
2334 }
2335
2336 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2337 {
2338         return (server->caps & NFS_CAP_ACLS)
2339                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2340                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2341 }
2342
2343 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2344  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2345  * the stack.
2346  */
2347 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2348
2349 static void buf_to_pages(const void *buf, size_t buflen,
2350                 struct page **pages, unsigned int *pgbase)
2351 {
2352         const void *p = buf;
2353
2354         *pgbase = offset_in_page(buf);
2355         p -= *pgbase;
2356         while (p < buf + buflen) {
2357                 *(pages++) = virt_to_page(p);
2358                 p += PAGE_CACHE_SIZE;
2359         }
2360 }
2361
2362 struct nfs4_cached_acl {
2363         int cached;
2364         size_t len;
2365         char data[0];
2366 };
2367
2368 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2369 {
2370         struct nfs_inode *nfsi = NFS_I(inode);
2371
2372         spin_lock(&inode->i_lock);
2373         kfree(nfsi->nfs4_acl);
2374         nfsi->nfs4_acl = acl;
2375         spin_unlock(&inode->i_lock);
2376 }
2377
2378 static void nfs4_zap_acl_attr(struct inode *inode)
2379 {
2380         nfs4_set_cached_acl(inode, NULL);
2381 }
2382
2383 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2384 {
2385         struct nfs_inode *nfsi = NFS_I(inode);
2386         struct nfs4_cached_acl *acl;
2387         int ret = -ENOENT;
2388
2389         spin_lock(&inode->i_lock);
2390         acl = nfsi->nfs4_acl;
2391         if (acl == NULL)
2392                 goto out;
2393         if (buf == NULL) /* user is just asking for length */
2394                 goto out_len;
2395         if (acl->cached == 0)
2396                 goto out;
2397         ret = -ERANGE; /* see getxattr(2) man page */
2398         if (acl->len > buflen)
2399                 goto out;
2400         memcpy(buf, acl->data, acl->len);
2401 out_len:
2402         ret = acl->len;
2403 out:
2404         spin_unlock(&inode->i_lock);
2405         return ret;
2406 }
2407
2408 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2409 {
2410         struct nfs4_cached_acl *acl;
2411
2412         if (buf && acl_len <= PAGE_SIZE) {
2413                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2414                 if (acl == NULL)
2415                         goto out;
2416                 acl->cached = 1;
2417                 memcpy(acl->data, buf, acl_len);
2418         } else {
2419                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2420                 if (acl == NULL)
2421                         goto out;
2422                 acl->cached = 0;
2423         }
2424         acl->len = acl_len;
2425 out:
2426         nfs4_set_cached_acl(inode, acl);
2427 }
2428
2429 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2430 {
2431         struct page *pages[NFS4ACL_MAXPAGES];
2432         struct nfs_getaclargs args = {
2433                 .fh = NFS_FH(inode),
2434                 .acl_pages = pages,
2435                 .acl_len = buflen,
2436         };
2437         size_t resp_len = buflen;
2438         void *resp_buf;
2439         struct rpc_message msg = {
2440                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2441                 .rpc_argp = &args,
2442                 .rpc_resp = &resp_len,
2443         };
2444         struct page *localpage = NULL;
2445         int ret;
2446
2447         if (buflen < PAGE_SIZE) {
2448                 /* As long as we're doing a round trip to the server anyway,
2449                  * let's be prepared for a page of acl data. */
2450                 localpage = alloc_page(GFP_KERNEL);
2451                 resp_buf = page_address(localpage);
2452                 if (localpage == NULL)
2453                         return -ENOMEM;
2454                 args.acl_pages[0] = localpage;
2455                 args.acl_pgbase = 0;
2456                 resp_len = args.acl_len = PAGE_SIZE;
2457         } else {
2458                 resp_buf = buf;
2459                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2460         }
2461         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2462         if (ret)
2463                 goto out_free;
2464         if (resp_len > args.acl_len)
2465                 nfs4_write_cached_acl(inode, NULL, resp_len);
2466         else
2467                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2468         if (buf) {
2469                 ret = -ERANGE;
2470                 if (resp_len > buflen)
2471                         goto out_free;
2472                 if (localpage)
2473                         memcpy(buf, resp_buf, resp_len);
2474         }
2475         ret = resp_len;
2476 out_free:
2477         if (localpage)
2478                 __free_page(localpage);
2479         return ret;
2480 }
2481
2482 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2483 {
2484         struct nfs_server *server = NFS_SERVER(inode);
2485         int ret;
2486
2487         if (!nfs4_server_supports_acls(server))
2488                 return -EOPNOTSUPP;
2489         ret = nfs_revalidate_inode(server, inode);
2490         if (ret < 0)
2491                 return ret;
2492         ret = nfs4_read_cached_acl(inode, buf, buflen);
2493         if (ret != -ENOENT)
2494                 return ret;
2495         return nfs4_get_acl_uncached(inode, buf, buflen);
2496 }
2497
2498 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2499 {
2500         struct nfs_server *server = NFS_SERVER(inode);
2501         struct page *pages[NFS4ACL_MAXPAGES];
2502         struct nfs_setaclargs arg = {
2503                 .fh             = NFS_FH(inode),
2504                 .acl_pages      = pages,
2505                 .acl_len        = buflen,
2506         };
2507         struct rpc_message msg = {
2508                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2509                 .rpc_argp       = &arg,
2510                 .rpc_resp       = NULL,
2511         };
2512         int ret;
2513
2514         if (!nfs4_server_supports_acls(server))
2515                 return -EOPNOTSUPP;
2516         nfs_inode_return_delegation(inode);
2517         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2518         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2519         if (ret == 0)
2520                 nfs4_write_cached_acl(inode, buf, buflen);
2521         return ret;
2522 }
2523
2524 static int
2525 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2526 {
2527         struct nfs4_client *clp = server->nfs4_state;
2528
2529         if (!clp || task->tk_status >= 0)
2530                 return 0;
2531         switch(task->tk_status) {
2532                 case -NFS4ERR_STALE_CLIENTID:
2533                 case -NFS4ERR_STALE_STATEID:
2534                 case -NFS4ERR_EXPIRED:
2535                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2536                         nfs4_schedule_state_recovery(clp);
2537                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2538                                 rpc_wake_up_task(task);
2539                         task->tk_status = 0;
2540                         return -EAGAIN;
2541                 case -NFS4ERR_GRACE:
2542                 case -NFS4ERR_DELAY:
2543                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2544                         task->tk_status = 0;
2545                         return -EAGAIN;
2546                 case -NFS4ERR_OLD_STATEID:
2547                         task->tk_status = 0;
2548                         return -EAGAIN;
2549         }
2550         task->tk_status = nfs4_map_errors(task->tk_status);
2551         return 0;
2552 }
2553
2554 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2555 {
2556         DEFINE_WAIT(wait);
2557         sigset_t oldset;
2558         int interruptible, res = 0;
2559
2560         might_sleep();
2561
2562         rpc_clnt_sigmask(clnt, &oldset);
2563         interruptible = TASK_UNINTERRUPTIBLE;
2564         if (clnt->cl_intr)
2565                 interruptible = TASK_INTERRUPTIBLE;
2566         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2567         nfs4_schedule_state_recovery(clp);
2568         if (clnt->cl_intr && signalled())
2569                 res = -ERESTARTSYS;
2570         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2571                 schedule();
2572         finish_wait(&clp->cl_waitq, &wait);
2573         rpc_clnt_sigunmask(clnt, &oldset);
2574         return res;
2575 }
2576
2577 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2578 {
2579         sigset_t oldset;
2580         int res = 0;
2581
2582         might_sleep();
2583
2584         if (*timeout <= 0)
2585                 *timeout = NFS4_POLL_RETRY_MIN;
2586         if (*timeout > NFS4_POLL_RETRY_MAX)
2587                 *timeout = NFS4_POLL_RETRY_MAX;
2588         rpc_clnt_sigmask(clnt, &oldset);
2589         if (clnt->cl_intr) {
2590                 schedule_timeout_interruptible(*timeout);
2591                 if (signalled())
2592                         res = -ERESTARTSYS;
2593         } else
2594                 schedule_timeout_uninterruptible(*timeout);
2595         rpc_clnt_sigunmask(clnt, &oldset);
2596         *timeout <<= 1;
2597         return res;
2598 }
2599
2600 /* This is the error handling routine for processes that are allowed
2601  * to sleep.
2602  */
2603 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2604 {
2605         struct nfs4_client *clp = server->nfs4_state;
2606         int ret = errorcode;
2607
2608         exception->retry = 0;
2609         switch(errorcode) {
2610                 case 0:
2611                         return 0;
2612                 case -NFS4ERR_STALE_CLIENTID:
2613                 case -NFS4ERR_STALE_STATEID:
2614                 case -NFS4ERR_EXPIRED:
2615                         ret = nfs4_wait_clnt_recover(server->client, clp);
2616                         if (ret == 0)
2617                                 exception->retry = 1;
2618                         break;
2619                 case -NFS4ERR_GRACE:
2620                 case -NFS4ERR_DELAY:
2621                         ret = nfs4_delay(server->client, &exception->timeout);
2622                         if (ret != 0)
2623                                 break;
2624                 case -NFS4ERR_OLD_STATEID:
2625                         exception->retry = 1;
2626         }
2627         /* We failed to handle the error */
2628         return nfs4_map_errors(ret);
2629 }
2630
2631 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2632 {
2633         nfs4_verifier sc_verifier;
2634         struct nfs4_setclientid setclientid = {
2635                 .sc_verifier = &sc_verifier,
2636                 .sc_prog = program,
2637         };
2638         struct rpc_message msg = {
2639                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2640                 .rpc_argp = &setclientid,
2641                 .rpc_resp = clp,
2642                 .rpc_cred = clp->cl_cred,
2643         };
2644         u32 *p;
2645         int loop = 0;
2646         int status;
2647
2648         p = (u32*)sc_verifier.data;
2649         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2650         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2651
2652         for(;;) {
2653                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2654                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2655                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2656                                 clp->cl_cred->cr_ops->cr_name,
2657                                 clp->cl_id_uniquifier);
2658                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2659                                 sizeof(setclientid.sc_netid), "tcp");
2660                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2661                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2662                                 clp->cl_ipaddr, port >> 8, port & 255);
2663
2664                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2665                 if (status != -NFS4ERR_CLID_INUSE)
2666                         break;
2667                 if (signalled())
2668                         break;
2669                 if (loop++ & 1)
2670                         ssleep(clp->cl_lease_time + 1);
2671                 else
2672                         if (++clp->cl_id_uniquifier == 0)
2673                                 break;
2674         }
2675         return status;
2676 }
2677
2678 int
2679 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2680 {
2681         struct nfs_fsinfo fsinfo;
2682         struct rpc_message msg = {
2683                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2684                 .rpc_argp = clp,
2685                 .rpc_resp = &fsinfo,
2686                 .rpc_cred = clp->cl_cred,
2687         };
2688         unsigned long now;
2689         int status;
2690
2691         now = jiffies;
2692         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2693         if (status == 0) {
2694                 spin_lock(&clp->cl_lock);
2695                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2696                 clp->cl_last_renewal = now;
2697                 spin_unlock(&clp->cl_lock);
2698         }
2699         return status;
2700 }
2701
2702 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2703 {
2704         struct nfs4_delegreturnargs args = {
2705                 .fhandle = NFS_FH(inode),
2706                 .stateid = stateid,
2707         };
2708         struct rpc_message msg = {
2709                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2710                 .rpc_argp = &args,
2711                 .rpc_cred = cred,
2712         };
2713
2714         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2715 }
2716
2717 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2718 {
2719         struct nfs_server *server = NFS_SERVER(inode);
2720         struct nfs4_exception exception = { };
2721         int err;
2722         do {
2723                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2724                 switch (err) {
2725                         case -NFS4ERR_STALE_STATEID:
2726                         case -NFS4ERR_EXPIRED:
2727                                 nfs4_schedule_state_recovery(server->nfs4_state);
2728                         case 0:
2729                                 return 0;
2730                 }
2731                 err = nfs4_handle_exception(server, err, &exception);
2732         } while (exception.retry);
2733         return err;
2734 }
2735
2736 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2737 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2738
2739 /*
2740  * sleep, with exponential backoff, and retry the LOCK operation.
2741  */
2742 static unsigned long
2743 nfs4_set_lock_task_retry(unsigned long timeout)
2744 {
2745         schedule_timeout_interruptible(timeout);
2746         timeout <<= 1;
2747         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2748                 return NFS4_LOCK_MAXTIMEOUT;
2749         return timeout;
2750 }
2751
2752 static inline int
2753 nfs4_lck_type(int cmd, struct file_lock *request)
2754 {
2755         /* set lock type */
2756         switch (request->fl_type) {
2757                 case F_RDLCK:
2758                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2759                 case F_WRLCK:
2760                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2761                 case F_UNLCK:
2762                         return NFS4_WRITE_LT;
2763         }
2764         BUG();
2765         return 0;
2766 }
2767
2768 static inline uint64_t
2769 nfs4_lck_length(struct file_lock *request)
2770 {
2771         if (request->fl_end == OFFSET_MAX)
2772                 return ~(uint64_t)0;
2773         return request->fl_end - request->fl_start + 1;
2774 }
2775
2776 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2777 {
2778         struct inode *inode = state->inode;
2779         struct nfs_server *server = NFS_SERVER(inode);
2780         struct nfs4_client *clp = server->nfs4_state;
2781         struct nfs_lockargs arg = {
2782                 .fh = NFS_FH(inode),
2783                 .type = nfs4_lck_type(cmd, request),
2784                 .offset = request->fl_start,
2785                 .length = nfs4_lck_length(request),
2786         };
2787         struct nfs_lockres res = {
2788                 .server = server,
2789         };
2790         struct rpc_message msg = {
2791                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2792                 .rpc_argp       = &arg,
2793                 .rpc_resp       = &res,
2794                 .rpc_cred       = state->owner->so_cred,
2795         };
2796         struct nfs_lowner nlo;
2797         struct nfs4_lock_state *lsp;
2798         int status;
2799
2800         down_read(&clp->cl_sem);
2801         nlo.clientid = clp->cl_clientid;
2802         status = nfs4_set_lock_state(state, request);
2803         if (status != 0)
2804                 goto out;
2805         lsp = request->fl_u.nfs4_fl.owner;
2806         nlo.id = lsp->ls_id;
2807         arg.u.lockt = &nlo;
2808         status = rpc_call_sync(server->client, &msg, 0);
2809         if (!status) {
2810                 request->fl_type = F_UNLCK;
2811         } else if (status == -NFS4ERR_DENIED) {
2812                 int64_t len, start, end;
2813                 start = res.u.denied.offset;
2814                 len = res.u.denied.length;
2815                 end = start + len - 1;
2816                 if (end < 0 || len == 0)
2817                         request->fl_end = OFFSET_MAX;
2818                 else
2819                         request->fl_end = (loff_t)end;
2820                 request->fl_start = (loff_t)start;
2821                 request->fl_type = F_WRLCK;
2822                 if (res.u.denied.type & 1)
2823                         request->fl_type = F_RDLCK;
2824                 request->fl_pid = 0;
2825                 status = 0;
2826         }
2827 out:
2828         up_read(&clp->cl_sem);
2829         return status;
2830 }
2831
2832 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2833 {
2834         struct nfs4_exception exception = { };
2835         int err;
2836
2837         do {
2838                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2839                                 _nfs4_proc_getlk(state, cmd, request),
2840                                 &exception);
2841         } while (exception.retry);
2842         return err;
2843 }
2844
2845 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2846 {
2847         int res = 0;
2848         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2849                 case FL_POSIX:
2850                         res = posix_lock_file_wait(file, fl);
2851                         break;
2852                 case FL_FLOCK:
2853                         res = flock_lock_file_wait(file, fl);
2854                         break;
2855                 default:
2856                         BUG();
2857         }
2858         if (res < 0)
2859                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2860                                 __FUNCTION__);
2861         return res;
2862 }
2863
2864 struct nfs4_unlockdata {
2865         struct nfs_lockargs arg;
2866         struct nfs_locku_opargs luargs;
2867         struct nfs_lockres res;
2868         struct nfs4_lock_state *lsp;
2869         struct nfs_open_context *ctx;
2870         atomic_t refcount;
2871         struct completion completion;
2872 };
2873
2874 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2875 {
2876         if (atomic_dec_and_test(&calldata->refcount)) {
2877                 nfs_free_seqid(calldata->luargs.seqid);
2878                 nfs4_put_lock_state(calldata->lsp);
2879                 put_nfs_open_context(calldata->ctx);
2880                 kfree(calldata);
2881         }
2882 }
2883
2884 static void nfs4_locku_complete(void *data)
2885 {
2886         struct nfs4_unlockdata *calldata = data;
2887         complete(&calldata->completion);
2888         nfs4_locku_release_calldata(calldata);
2889 }
2890
2891 static void nfs4_locku_done(struct rpc_task *task, void *data)
2892 {
2893         struct nfs4_unlockdata *calldata = data;
2894
2895         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2896         switch (task->tk_status) {
2897                 case 0:
2898                         memcpy(calldata->lsp->ls_stateid.data,
2899                                         calldata->res.u.stateid.data,
2900                                         sizeof(calldata->lsp->ls_stateid.data));
2901                         break;
2902                 case -NFS4ERR_STALE_STATEID:
2903                 case -NFS4ERR_EXPIRED:
2904                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2905                         break;
2906                 default:
2907                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2908                                 rpc_restart_call(task);
2909                         }
2910         }
2911 }
2912
2913 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
2914 {
2915         struct nfs4_unlockdata *calldata = data;
2916         struct rpc_message msg = {
2917                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2918                 .rpc_argp       = &calldata->arg,
2919                 .rpc_resp       = &calldata->res,
2920                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2921         };
2922         int status;
2923
2924         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2925         if (status != 0)
2926                 return;
2927         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2928                 /* Note: exit _without_ running nfs4_locku_done */
2929                 task->tk_action = NULL;
2930                 return;
2931         }
2932         rpc_call_setup(task, &msg, 0);
2933 }
2934
2935 static const struct rpc_call_ops nfs4_locku_ops = {
2936         .rpc_call_prepare = nfs4_locku_prepare,
2937         .rpc_call_done = nfs4_locku_done,
2938         .rpc_release = nfs4_locku_complete,
2939 };
2940
2941 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2942 {
2943         struct nfs4_unlockdata *calldata;
2944         struct inode *inode = state->inode;
2945         struct nfs_server *server = NFS_SERVER(inode);
2946         struct nfs4_lock_state *lsp;
2947         int status;
2948
2949         /* Is this a delegated lock? */
2950         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
2951                 return do_vfs_lock(request->fl_file, request);
2952
2953         status = nfs4_set_lock_state(state, request);
2954         if (status != 0)
2955                 return status;
2956         lsp = request->fl_u.nfs4_fl.owner;
2957         /* We might have lost the locks! */
2958         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2959                 return 0;
2960         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2961         if (calldata == NULL)
2962                 return -ENOMEM;
2963         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2964         if (calldata->luargs.seqid == NULL) {
2965                 kfree(calldata);
2966                 return -ENOMEM;
2967         }
2968         calldata->luargs.stateid = &lsp->ls_stateid;
2969         calldata->arg.fh = NFS_FH(inode);
2970         calldata->arg.type = nfs4_lck_type(cmd, request);
2971         calldata->arg.offset = request->fl_start;
2972         calldata->arg.length = nfs4_lck_length(request);
2973         calldata->arg.u.locku = &calldata->luargs;
2974         calldata->res.server = server;
2975         calldata->lsp = lsp;
2976         atomic_inc(&lsp->ls_count);
2977
2978         /* Ensure we don't close file until we're done freeing locks! */
2979         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2980
2981         atomic_set(&calldata->refcount, 2);
2982         init_completion(&calldata->completion);
2983
2984         status = nfs4_call_async(NFS_SERVER(inode)->client, &nfs4_locku_ops, calldata);
2985         if (status == 0)
2986                 wait_for_completion_interruptible(&calldata->completion);
2987         do_vfs_lock(request->fl_file, request);
2988         nfs4_locku_release_calldata(calldata);
2989         return status;
2990 }
2991
2992 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2993 {
2994         struct inode *inode = state->inode;
2995         struct nfs_server *server = NFS_SERVER(inode);
2996         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2997         struct nfs_lock_opargs largs = {
2998                 .lock_stateid = &lsp->ls_stateid,
2999                 .open_stateid = &state->stateid,
3000                 .lock_owner = {
3001                         .clientid = server->nfs4_state->cl_clientid,
3002                         .id = lsp->ls_id,
3003                 },
3004                 .reclaim = reclaim,
3005         };
3006         struct nfs_lockargs arg = {
3007                 .fh = NFS_FH(inode),
3008                 .type = nfs4_lck_type(cmd, request),
3009                 .offset = request->fl_start,
3010                 .length = nfs4_lck_length(request),
3011                 .u = {
3012                         .lock = &largs,
3013                 },
3014         };
3015         struct nfs_lockres res = {
3016                 .server = server,
3017         };
3018         struct rpc_message msg = {
3019                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3020                 .rpc_argp       = &arg,
3021                 .rpc_resp       = &res,
3022                 .rpc_cred       = state->owner->so_cred,
3023         };
3024         int status = -ENOMEM;
3025
3026         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3027         if (largs.lock_seqid == NULL)
3028                 return -ENOMEM;
3029         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
3030                 struct nfs4_state_owner *owner = state->owner;
3031
3032                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
3033                 if (largs.open_seqid == NULL)
3034                         goto out;
3035                 largs.new_lock_owner = 1;
3036                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3037                 /* increment open seqid on success, and seqid mutating errors */
3038                 if (largs.new_lock_owner != 0) {
3039                         nfs_increment_open_seqid(status, largs.open_seqid);
3040                         if (status == 0)
3041                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
3042                 }
3043                 nfs_free_seqid(largs.open_seqid);
3044         } else
3045                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
3046         /* increment lock seqid on success, and seqid mutating errors*/
3047         nfs_increment_lock_seqid(status, largs.lock_seqid);
3048         /* save the returned stateid. */
3049         if (status == 0) {
3050                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
3051                                 sizeof(lsp->ls_stateid.data));
3052                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3053         } else if (status == -NFS4ERR_DENIED)
3054                 status = -EAGAIN;
3055 out:
3056         nfs_free_seqid(largs.lock_seqid);
3057         return status;
3058 }
3059
3060 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3061 {
3062         struct nfs_server *server = NFS_SERVER(state->inode);
3063         struct nfs4_exception exception = { };
3064         int err;
3065
3066         /* Cache the lock if possible... */
3067         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3068                 return 0;
3069         do {
3070                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3071                 if (err != -NFS4ERR_DELAY)
3072                         break;
3073                 nfs4_handle_exception(server, err, &exception);
3074         } while (exception.retry);
3075         return err;
3076 }
3077
3078 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3079 {
3080         struct nfs_server *server = NFS_SERVER(state->inode);
3081         struct nfs4_exception exception = { };
3082         int err;
3083
3084         err = nfs4_set_lock_state(state, request);
3085         if (err != 0)
3086                 return err;
3087         do {
3088                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3089                 if (err != -NFS4ERR_DELAY)
3090                         break;
3091                 nfs4_handle_exception(server, err, &exception);
3092         } while (exception.retry);
3093         return err;
3094 }
3095
3096 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3097 {
3098         struct nfs4_client *clp = state->owner->so_client;
3099         int status;
3100
3101         /* Is this a delegated open? */
3102         if (NFS_I(state->inode)->delegation_state != 0) {
3103                 /* Yes: cache locks! */
3104                 status = do_vfs_lock(request->fl_file, request);
3105                 /* ...but avoid races with delegation recall... */
3106                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3107                         return status;
3108         }
3109         down_read(&clp->cl_sem);
3110         status = nfs4_set_lock_state(state, request);
3111         if (status != 0)
3112                 goto out;
3113         status = _nfs4_do_setlk(state, cmd, request, 0);
3114         if (status != 0)
3115                 goto out;
3116         /* Note: we always want to sleep here! */
3117         request->fl_flags |= FL_SLEEP;
3118         if (do_vfs_lock(request->fl_file, request) < 0)
3119                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3120 out:
3121         up_read(&clp->cl_sem);
3122         return status;
3123 }
3124
3125 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129
3130         do {
3131                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3132                                 _nfs4_proc_setlk(state, cmd, request),
3133                                 &exception);
3134         } while (exception.retry);
3135         return err;
3136 }
3137
3138 static int
3139 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3140 {
3141         struct nfs_open_context *ctx;
3142         struct nfs4_state *state;
3143         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3144         int status;
3145
3146         /* verify open state */
3147         ctx = (struct nfs_open_context *)filp->private_data;
3148         state = ctx->state;
3149
3150         if (request->fl_start < 0 || request->fl_end < 0)
3151                 return -EINVAL;
3152
3153         if (IS_GETLK(cmd))
3154                 return nfs4_proc_getlk(state, F_GETLK, request);
3155
3156         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3157                 return -EINVAL;
3158
3159         if (request->fl_type == F_UNLCK)
3160                 return nfs4_proc_unlck(state, cmd, request);
3161
3162         do {
3163                 status = nfs4_proc_setlk(state, cmd, request);
3164                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3165                         break;
3166                 timeout = nfs4_set_lock_task_retry(timeout);
3167                 status = -ERESTARTSYS;
3168                 if (signalled())
3169                         break;
3170         } while(status < 0);
3171         return status;
3172 }
3173
3174 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3175 {
3176         struct nfs_server *server = NFS_SERVER(state->inode);
3177         struct nfs4_exception exception = { };
3178         int err;
3179
3180         err = nfs4_set_lock_state(state, fl);
3181         if (err != 0)
3182                 goto out;
3183         do {
3184                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3185                 if (err != -NFS4ERR_DELAY)
3186                         break;
3187                 err = nfs4_handle_exception(server, err, &exception);
3188         } while (exception.retry);
3189 out:
3190         return err;
3191 }
3192
3193 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3194
3195 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3196                 size_t buflen, int flags)
3197 {
3198         struct inode *inode = dentry->d_inode;
3199
3200         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3201                 return -EOPNOTSUPP;
3202
3203         if (!S_ISREG(inode->i_mode) &&
3204             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3205                 return -EPERM;
3206
3207         return nfs4_proc_set_acl(inode, buf, buflen);
3208 }
3209
3210 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3211  * and that's what we'll do for e.g. user attributes that haven't been set.
3212  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3213  * attributes in kernel-managed attribute namespaces. */
3214 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3215                 size_t buflen)
3216 {
3217         struct inode *inode = dentry->d_inode;
3218
3219         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3220                 return -EOPNOTSUPP;
3221
3222         return nfs4_proc_get_acl(inode, buf, buflen);
3223 }
3224
3225 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3226 {
3227         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3228
3229         if (buf && buflen < len)
3230                 return -ERANGE;
3231         if (buf)
3232                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3233         return len;
3234 }
3235
3236 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3237         .recover_open   = nfs4_open_reclaim,
3238         .recover_lock   = nfs4_lock_reclaim,
3239 };
3240
3241 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3242         .recover_open   = nfs4_open_expired,
3243         .recover_lock   = nfs4_lock_expired,
3244 };
3245
3246 static struct inode_operations nfs4_file_inode_operations = {
3247         .permission     = nfs_permission,
3248         .getattr        = nfs_getattr,
3249         .setattr        = nfs_setattr,
3250         .getxattr       = nfs4_getxattr,
3251         .setxattr       = nfs4_setxattr,
3252         .listxattr      = nfs4_listxattr,
3253 };
3254
3255 struct nfs_rpc_ops      nfs_v4_clientops = {
3256         .version        = 4,                    /* protocol version */
3257         .dentry_ops     = &nfs4_dentry_operations,
3258         .dir_inode_ops  = &nfs4_dir_inode_operations,
3259         .file_inode_ops = &nfs4_file_inode_operations,
3260         .getroot        = nfs4_proc_get_root,
3261         .getattr        = nfs4_proc_getattr,
3262         .setattr        = nfs4_proc_setattr,
3263         .lookup         = nfs4_proc_lookup,
3264         .access         = nfs4_proc_access,
3265         .readlink       = nfs4_proc_readlink,
3266         .read           = nfs4_proc_read,
3267         .write          = nfs4_proc_write,
3268         .commit         = nfs4_proc_commit,
3269         .create         = nfs4_proc_create,
3270         .remove         = nfs4_proc_remove,
3271         .unlink_setup   = nfs4_proc_unlink_setup,
3272         .unlink_done    = nfs4_proc_unlink_done,
3273         .rename         = nfs4_proc_rename,
3274         .link           = nfs4_proc_link,
3275         .symlink        = nfs4_proc_symlink,
3276         .mkdir          = nfs4_proc_mkdir,
3277         .rmdir          = nfs4_proc_remove,
3278         .readdir        = nfs4_proc_readdir,
3279         .mknod          = nfs4_proc_mknod,
3280         .statfs         = nfs4_proc_statfs,
3281         .fsinfo         = nfs4_proc_fsinfo,
3282         .pathconf       = nfs4_proc_pathconf,
3283         .decode_dirent  = nfs4_decode_dirent,
3284         .read_setup     = nfs4_proc_read_setup,
3285         .write_setup    = nfs4_proc_write_setup,
3286         .commit_setup   = nfs4_proc_commit_setup,
3287         .file_open      = nfs_open,
3288         .file_release   = nfs_release,
3289         .lock           = nfs4_proc_lock,
3290         .clear_acl_cache = nfs4_zap_acl_attr,
3291 };
3292
3293 /*
3294  * Local variables:
3295  *  c-basic-offset: 8
3296  * End:
3297  */