fs/9p/vfs_inode.c

   1 /*
   2  *  linux/fs/9p/vfs_inode.c
   3  *
   4  * This file contains vfs inode ops for the 9P2000 protocol.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/file.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/stat.h>
  32 #include <linux/string.h>
  33 #include <linux/inet.h>
  34 #include <linux/namei.h>
  35 #include <linux/idr.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/xattr.h>
  39 #include <linux/posix_acl.h>
  40 #include <net/9p/9p.h>
  41 #include <net/9p/client.h>
  42
  43 #include "v9fs.h"
  44 #include "v9fs_vfs.h"
  45 #include "fid.h"
  46 #include "cache.h"
  47 #include "xattr.h"
  48 #include "acl.h"
  49
  50 static const struct inode_operations v9fs_dir_inode_operations;
  51 static const struct inode_operations v9fs_dir_inode_operations_dotu;
  52 static const struct inode_operations v9fs_file_inode_operations;
  53 static const struct inode_operations v9fs_symlink_inode_operations;
  54
  55 /**
  56  * unixmode2p9mode - convert unix mode bits to plan 9
  57  * @v9ses: v9fs session information
  58  * @mode: mode to convert
  59  *
  60  */
  61
  62 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
  63 {
  64         int res;
  65         res = mode & 0777;
  66         if (S_ISDIR(mode))
  67                 res |= P9_DMDIR;
  68         if (v9fs_proto_dotu(v9ses)) {
  69                 if (S_ISLNK(mode))
  70                         res |= P9_DMSYMLINK;
  71                 if (v9ses->nodev == 0) {
  72                         if (S_ISSOCK(mode))
  73                                 res |= P9_DMSOCKET;
  74                         if (S_ISFIFO(mode))
  75                                 res |= P9_DMNAMEDPIPE;
  76                         if (S_ISBLK(mode))
  77                                 res |= P9_DMDEVICE;
  78                         if (S_ISCHR(mode))
  79                                 res |= P9_DMDEVICE;
  80                 }
  81
  82                 if ((mode & S_ISUID) == S_ISUID)
  83                         res |= P9_DMSETUID;
  84                 if ((mode & S_ISGID) == S_ISGID)
  85                         res |= P9_DMSETGID;
  86                 if ((mode & S_ISVTX) == S_ISVTX)
  87                         res |= P9_DMSETVTX;
  88                 if ((mode & P9_DMLINK))
  89                         res |= P9_DMLINK;
  90         }
  91
  92         return res;
  93 }
  94
  95 /**
  96  * p9mode2unixmode- convert plan9 mode bits to unix mode bits
  97  * @v9ses: v9fs session information
  98  * @mode: mode to convert
  99  *
 100  */
 101
 102 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
 103 {
 104         int res;
 105
 106         res = mode & 0777;
 107
 108         if ((mode & P9_DMDIR) == P9_DMDIR)
 109                 res |= S_IFDIR;
 110         else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
 111                 res |= S_IFLNK;
 112         else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
 113                  && (v9ses->nodev == 0))
 114                 res |= S_IFSOCK;
 115         else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
 116                  && (v9ses->nodev == 0))
 117                 res |= S_IFIFO;
 118         else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
 119                  && (v9ses->nodev == 0))
 120                 res |= S_IFBLK;
 121         else
 122                 res |= S_IFREG;
 123
 124         if (v9fs_proto_dotu(v9ses)) {
 125                 if ((mode & P9_DMSETUID) == P9_DMSETUID)
 126                         res |= S_ISUID;
 127
 128                 if ((mode & P9_DMSETGID) == P9_DMSETGID)
 129                         res |= S_ISGID;
 130
 131                 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
 132                         res |= S_ISVTX;
 133         }
 134
 135         return res;
 136 }
 137
 138 /**
 139  * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
 140  * @uflags: flags to convert
 141  * @extended: if .u extensions are active
 142  */
 143
 144 int v9fs_uflags2omode(int uflags, int extended)
 145 {
 146         int ret;
 147
 148         ret = 0;
 149         switch (uflags&3) {
 150         default:
 151         case O_RDONLY:
 152                 ret = P9_OREAD;
 153                 break;
 154
 155         case O_WRONLY:
 156                 ret = P9_OWRITE;
 157                 break;
 158
 159         case O_RDWR:
 160                 ret = P9_ORDWR;
 161                 break;
 162         }
 163
 164         if (uflags & O_TRUNC)
 165                 ret |= P9_OTRUNC;
 166
 167         if (extended) {
 168                 if (uflags & O_EXCL)
 169                         ret |= P9_OEXCL;
 170
 171                 if (uflags & O_APPEND)
 172                         ret |= P9_OAPPEND;
 173         }
 174
 175         return ret;
 176 }
 177
 178 /**
 179  * v9fs_blank_wstat - helper function to setup a 9P stat structure
 180  * @wstat: structure to initialize
 181  *
 182  */
 183
 184 void
 185 v9fs_blank_wstat(struct p9_wstat *wstat)
 186 {
 187         wstat->type = ~0;
 188         wstat->dev = ~0;
 189         wstat->qid.type = ~0;
 190         wstat->qid.version = ~0;
 191         *((long long *)&wstat->qid.path) = ~0;
 192         wstat->mode = ~0;
 193         wstat->atime = ~0;
 194         wstat->mtime = ~0;
 195         wstat->length = ~0;
 196         wstat->name = NULL;
 197         wstat->uid = NULL;
 198         wstat->gid = NULL;
 199         wstat->muid = NULL;
 200         wstat->n_uid = ~0;
 201         wstat->n_gid = ~0;
 202         wstat->n_muid = ~0;
 203         wstat->extension = NULL;
 204 }
 205
 206 /**
 207  * v9fs_alloc_inode - helper function to allocate an inode
 208  *
 209  */
 210 struct inode *v9fs_alloc_inode(struct super_block *sb)
 211 {
 212         struct v9fs_inode *v9inode;
 213         v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
 214                                                         GFP_KERNEL);
 215         if (!v9inode)
 216                 return NULL;
 217 #ifdef CONFIG_9P_FSCACHE
 218         v9inode->fscache = NULL;
 219         v9inode->fscache_key = NULL;
 220         spin_lock_init(&v9inode->fscache_lock);
 221 #endif
 222         v9inode->writeback_fid = NULL;
 223         v9inode->cache_validity = 0;
 224         mutex_init(&v9inode->v_mutex);
 225         return &v9inode->vfs_inode;
 226 }
 227
 228 /**
 229  * v9fs_destroy_inode - destroy an inode
 230  *
 231  */
 232
 233 static void v9fs_i_callback(struct rcu_head *head)
 234 {
 235         struct inode *inode = container_of(head, struct inode, i_rcu);
 236         INIT_LIST_HEAD(&inode->i_dentry);
 237         kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
 238 }
 239
 240 void v9fs_destroy_inode(struct inode *inode)
 241 {
 242         call_rcu(&inode->i_rcu, v9fs_i_callback);
 243 }
 244
 245 int v9fs_init_inode(struct v9fs_session_info *v9ses,
 246                     struct inode *inode, int mode)
 247 {
 248         int err = 0;
 249
 250         inode_init_owner(inode, NULL, mode);
 251         inode->i_blocks = 0;
 252         inode->i_rdev = 0;
 253         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 254         inode->i_mapping->a_ops = &v9fs_addr_operations;
 255
 256         switch (mode & S_IFMT) {
 257         case S_IFIFO:
 258         case S_IFBLK:
 259         case S_IFCHR:
 260         case S_IFSOCK:
 261                 if (v9fs_proto_dotl(v9ses)) {
 262                         inode->i_op = &v9fs_file_inode_operations_dotl;
 263                         inode->i_fop = &v9fs_file_operations_dotl;
 264                 } else if (v9fs_proto_dotu(v9ses)) {
 265                         inode->i_op = &v9fs_file_inode_operations;
 266                         inode->i_fop = &v9fs_file_operations;
 267                 } else {
 268                         P9_DPRINTK(P9_DEBUG_ERROR,
 269                                    "special files without extended mode\n");
 270                         err = -EINVAL;
 271                         goto error;
 272                 }
 273                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 274                 break;
 275         case S_IFREG:
 276                 if (v9fs_proto_dotl(v9ses)) {
 277                         inode->i_op = &v9fs_file_inode_operations_dotl;
 278                         if (v9ses->cache)
 279                                 inode->i_fop =
 280                                         &v9fs_cached_file_operations_dotl;
 281                         else
 282                                 inode->i_fop = &v9fs_file_operations_dotl;
 283                 } else {
 284                         inode->i_op = &v9fs_file_inode_operations;
 285                         if (v9ses->cache)
 286                                 inode->i_fop = &v9fs_cached_file_operations;
 287                         else
 288                                 inode->i_fop = &v9fs_file_operations;
 289                 }
 290
 291                 break;
 292         case S_IFLNK:
 293                 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
 294                         P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
 295                                                 "legacy protocol.\n");
 296                         err = -EINVAL;
 297                         goto error;
 298                 }
 299
 300                 if (v9fs_proto_dotl(v9ses))
 301                         inode->i_op = &v9fs_symlink_inode_operations_dotl;
 302                 else
 303                         inode->i_op = &v9fs_symlink_inode_operations;
 304
 305                 break;
 306         case S_IFDIR:
 307                 inc_nlink(inode);
 308                 if (v9fs_proto_dotl(v9ses))
 309                         inode->i_op = &v9fs_dir_inode_operations_dotl;
 310                 else if (v9fs_proto_dotu(v9ses))
 311                         inode->i_op = &v9fs_dir_inode_operations_dotu;
 312                 else
 313                         inode->i_op = &v9fs_dir_inode_operations;
 314
 315                 if (v9fs_proto_dotl(v9ses))
 316                         inode->i_fop = &v9fs_dir_operations_dotl;
 317                 else
 318                         inode->i_fop = &v9fs_dir_operations;
 319
 320                 break;
 321         default:
 322                 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
 323                            mode, mode & S_IFMT);
 324                 err = -EINVAL;
 325                 goto error;
 326         }
 327 error:
 328         return err;
 329
 330 }
 331
 332 /**
 333  * v9fs_get_inode - helper function to setup an inode
 334  * @sb: superblock
 335  * @mode: mode to setup inode with
 336  *
 337  */
 338
 339 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 340 {
 341         int err;
 342         struct inode *inode;
 343         struct v9fs_session_info *v9ses = sb->s_fs_info;
 344
 345         P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
 346
 347         inode = new_inode(sb);
 348         if (!inode) {
 349                 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
 350                 return ERR_PTR(-ENOMEM);
 351         }
 352         err = v9fs_init_inode(v9ses, inode, mode);
 353         if (err) {
 354                 iput(inode);
 355                 return ERR_PTR(err);
 356         }
 357         return inode;
 358 }
 359
 360 /*
 361 static struct v9fs_fid*
 362 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
 363 {
 364         int err;
 365         int nfid;
 366         struct v9fs_fid *ret;
 367         struct v9fs_fcall *fcall;
 368
 369         nfid = v9fs_get_idpool(&v9ses->fidpool);
 370         if (nfid < 0) {
 371                 eprintk(KERN_WARNING, "no free fids available\n");
 372                 return ERR_PTR(-ENOSPC);
 373         }
 374
 375         err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
 376                 &fcall);
 377
 378         if (err < 0) {
 379                 if (fcall && fcall->id == RWALK)
 380                         goto clunk_fid;
 381
 382                 PRINT_FCALL_ERROR("walk error", fcall);
 383                 v9fs_put_idpool(nfid, &v9ses->fidpool);
 384                 goto error;
 385         }
 386
 387         kfree(fcall);
 388         fcall = NULL;
 389         ret = v9fs_fid_create(v9ses, nfid);
 390         if (!ret) {
 391                 err = -ENOMEM;
 392                 goto clunk_fid;
 393         }
 394
 395         err = v9fs_fid_insert(ret, dentry);
 396         if (err < 0) {
 397                 v9fs_fid_destroy(ret);
 398                 goto clunk_fid;
 399         }
 400
 401         return ret;
 402
 403 clunk_fid:
 404         v9fs_t_clunk(v9ses, nfid);
 405
 406 error:
 407         kfree(fcall);
 408         return ERR_PTR(err);
 409 }
 410 */
 411
 412
 413 /**
 414  * v9fs_clear_inode - release an inode
 415  * @inode: inode to release
 416  *
 417  */
 418 void v9fs_evict_inode(struct inode *inode)
 419 {
 420         struct v9fs_inode *v9inode = V9FS_I(inode);
 421
 422         truncate_inode_pages(inode->i_mapping, 0);
 423         end_writeback(inode);
 424         filemap_fdatawrite(inode->i_mapping);
 425
 426 #ifdef CONFIG_9P_FSCACHE
 427         v9fs_cache_inode_put_cookie(inode);
 428 #endif
 429         /* clunk the fid stashed in writeback_fid */
 430         if (v9inode->writeback_fid) {
 431                 p9_client_clunk(v9inode->writeback_fid);
 432                 v9inode->writeback_fid = NULL;
 433         }
 434 }
 435
 436 static struct inode *v9fs_qid_iget(struct super_block *sb,
 437                                    struct p9_qid *qid,
 438                                    struct p9_wstat *st)
 439 {
 440         int retval, umode;
 441         unsigned long i_ino;
 442         struct inode *inode;
 443         struct v9fs_session_info *v9ses = sb->s_fs_info;
 444
 445         i_ino = v9fs_qid2ino(qid);
 446         inode = iget_locked(sb, i_ino);
 447         if (!inode)
 448                 return ERR_PTR(-ENOMEM);
 449         if (!(inode->i_state & I_NEW))
 450                 return inode;
 451         /*
 452          * initialize the inode with the stat info
 453          * FIXME!! we may need support for stale inodes
 454          * later.
 455          */
 456         umode = p9mode2unixmode(v9ses, st->mode);
 457         retval = v9fs_init_inode(v9ses, inode, umode);
 458         if (retval)
 459                 goto error;
 460
 461         v9fs_stat2inode(st, inode, sb);
 462 #ifdef CONFIG_9P_FSCACHE
 463         v9fs_fscache_set_key(inode, &st->qid);
 464         v9fs_cache_inode_get_cookie(inode);
 465 #endif
 466         unlock_new_inode(inode);
 467         return inode;
 468 error:
 469         unlock_new_inode(inode);
 470         iput(inode);
 471         return ERR_PTR(retval);
 472
 473 }
 474
 475 struct inode *
 476 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 477                     struct super_block *sb)
 478 {
 479         struct p9_wstat *st;
 480         struct inode *inode = NULL;
 481
 482         st = p9_client_stat(fid);
 483         if (IS_ERR(st))
 484                 return ERR_CAST(st);
 485
 486         inode = v9fs_qid_iget(sb, &st->qid, st);
 487         p9stat_free(st);
 488         kfree(st);
 489         return inode;
 490 }
 491
 492 /**
 493  * v9fs_remove - helper function to remove files and directories
 494  * @dir: directory inode that is being deleted
 495  * @file:  dentry that is being deleted
 496  * @rmdir: removing a directory
 497  *
 498  */
 499
 500 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
 501 {
 502         int retval;
 503         struct p9_fid *v9fid;
 504         struct inode *file_inode;
 505
 506         P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
 507                 rmdir);
 508
 509         file_inode = file->d_inode;
 510         v9fid = v9fs_fid_clone(file);
 511         if (IS_ERR(v9fid))
 512                 return PTR_ERR(v9fid);
 513
 514         retval = p9_client_remove(v9fid);
 515         if (!retval) {
 516                 /*
 517                  * directories on unlink should have zero
 518                  * link count
 519                  */
 520                 if (rmdir) {
 521                         clear_nlink(file_inode);
 522                         drop_nlink(dir);
 523                 } else
 524                         drop_nlink(file_inode);
 525
 526                 v9fs_invalidate_inode_attr(file_inode);
 527                 v9fs_invalidate_inode_attr(dir);
 528         }
 529         return retval;
 530 }
 531
 532 /**
 533  * v9fs_create - Create a file
 534  * @v9ses: session information
 535  * @dir: directory that dentry is being created in
 536  * @dentry:  dentry that is being created
 537  * @extension: 9p2000.u extension string to support devices, etc.
 538  * @perm: create permissions
 539  * @mode: open mode
 540  *
 541  */
 542 static struct p9_fid *
 543 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 544                 struct dentry *dentry, char *extension, u32 perm, u8 mode)
 545 {
 546         int err;
 547         char *name;
 548         struct p9_fid *dfid, *ofid, *fid;
 549         struct inode *inode;
 550
 551         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 552
 553         err = 0;
 554         ofid = NULL;
 555         fid = NULL;
 556         name = (char *) dentry->d_name.name;
 557         dfid = v9fs_fid_lookup(dentry->d_parent);
 558         if (IS_ERR(dfid)) {
 559                 err = PTR_ERR(dfid);
 560                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 561                 return ERR_PTR(err);
 562         }
 563
 564         /* clone a fid to use for creation */
 565         ofid = p9_client_walk(dfid, 0, NULL, 1);
 566         if (IS_ERR(ofid)) {
 567                 err = PTR_ERR(ofid);
 568                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 569                 return ERR_PTR(err);
 570         }
 571
 572         err = p9_client_fcreate(ofid, name, perm, mode, extension);
 573         if (err < 0) {
 574                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
 575                 goto error;
 576         }
 577
 578         /* now walk from the parent so we can get unopened fid */
 579         fid = p9_client_walk(dfid, 1, &name, 1);
 580         if (IS_ERR(fid)) {
 581                 err = PTR_ERR(fid);
 582                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 583                 fid = NULL;
 584                 goto error;
 585         }
 586
 587         /* instantiate inode and assign the unopened fid to the dentry */
 588         inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 589         if (IS_ERR(inode)) {
 590                 err = PTR_ERR(inode);
 591                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 592                 goto error;
 593         }
 594         d_instantiate(dentry, inode);
 595         err = v9fs_fid_add(dentry, fid);
 596         if (err < 0)
 597                 goto error;
 598
 599         return ofid;
 600
 601 error:
 602         if (ofid)
 603                 p9_client_clunk(ofid);
 604
 605         if (fid)
 606                 p9_client_clunk(fid);
 607
 608         return ERR_PTR(err);
 609 }
 610
 611 /**
 612  * v9fs_vfs_create - VFS hook to create files
 613  * @dir: directory inode that is being created
 614  * @dentry:  dentry that is being deleted
 615  * @mode: create permissions
 616  * @nd: path information
 617  *
 618  */
 619
 620 static int
 621 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
 622                 struct nameidata *nd)
 623 {
 624         int err;
 625         u32 perm;
 626         int flags;
 627         struct file *filp;
 628         struct v9fs_inode *v9inode;
 629         struct v9fs_session_info *v9ses;
 630         struct p9_fid *fid, *inode_fid;
 631
 632         err = 0;
 633         fid = NULL;
 634         v9ses = v9fs_inode2v9ses(dir);
 635         perm = unixmode2p9mode(v9ses, mode);
 636         if (nd && nd->flags & LOOKUP_OPEN)
 637                 flags = nd->intent.open.flags - 1;
 638         else
 639                 flags = O_RDWR;
 640
 641         fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
 642                                 v9fs_uflags2omode(flags,
 643                                                 v9fs_proto_dotu(v9ses)));
 644         if (IS_ERR(fid)) {
 645                 err = PTR_ERR(fid);
 646                 fid = NULL;
 647                 goto error;
 648         }
 649
 650         v9fs_invalidate_inode_attr(dir);
 651         /* if we are opening a file, assign the open fid to the file */
 652         if (nd && nd->flags & LOOKUP_OPEN) {
 653                 v9inode = V9FS_I(dentry->d_inode);
 654                 mutex_lock(&v9inode->v_mutex);
 655                 if (v9ses->cache && !v9inode->writeback_fid &&
 656                     ((flags & O_ACCMODE) != O_RDONLY)) {
 657                         /*
 658                          * clone a fid and add it to writeback_fid
 659                          * we do it during open time instead of
 660                          * page dirty time via write_begin/page_mkwrite
 661                          * because we want write after unlink usecase
 662                          * to work.
 663                          */
 664                         inode_fid = v9fs_writeback_fid(dentry);
 665                         if (IS_ERR(inode_fid)) {
 666                                 err = PTR_ERR(inode_fid);
 667                                 mutex_unlock(&v9inode->v_mutex);
 668                                 goto error;
 669                         }
 670                         v9inode->writeback_fid = (void *) inode_fid;
 671                 }
 672                 mutex_unlock(&v9inode->v_mutex);
 673                 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 674                 if (IS_ERR(filp)) {
 675                         err = PTR_ERR(filp);
 676                         goto error;
 677                 }
 678
 679                 filp->private_data = fid;
 680 #ifdef CONFIG_9P_FSCACHE
 681                 if (v9ses->cache)
 682                         v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
 683 #endif
 684         } else
 685                 p9_client_clunk(fid);
 686
 687         return 0;
 688
 689 error:
 690         if (fid)
 691                 p9_client_clunk(fid);
 692
 693         return err;
 694 }
 695
 696 /**
 697  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
 698  * @dir:  inode that is being unlinked
 699  * @dentry: dentry that is being unlinked
 700  * @mode: mode for new directory
 701  *
 702  */
 703
 704 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 705 {
 706         int err;
 707         u32 perm;
 708         struct p9_fid *fid;
 709         struct v9fs_session_info *v9ses;
 710
 711         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 712         err = 0;
 713         v9ses = v9fs_inode2v9ses(dir);
 714         perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
 715         fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
 716         if (IS_ERR(fid)) {
 717                 err = PTR_ERR(fid);
 718                 fid = NULL;
 719         } else {
 720                 inc_nlink(dir);
 721                 v9fs_invalidate_inode_attr(dir);
 722         }
 723
 724         if (fid)
 725                 p9_client_clunk(fid);
 726
 727         return err;
 728 }
 729
 730 /**
 731  * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
 732  * @dir:  inode that is being walked from
 733  * @dentry: dentry that is being walked to?
 734  * @nameidata: path data
 735  *
 736  */
 737
 738 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 739                                       struct nameidata *nameidata)
 740 {
 741         struct super_block *sb;
 742         struct v9fs_session_info *v9ses;
 743         struct p9_fid *dfid, *fid;
 744         struct inode *inode;
 745         char *name;
 746         int result = 0;
 747
 748         P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
 749                 dir, dentry->d_name.name, dentry, nameidata);
 750
 751         if (dentry->d_name.len > NAME_MAX)
 752                 return ERR_PTR(-ENAMETOOLONG);
 753
 754         sb = dir->i_sb;
 755         v9ses = v9fs_inode2v9ses(dir);
 756         /* We can walk d_parent because we hold the dir->i_mutex */
 757         dfid = v9fs_fid_lookup(dentry->d_parent);
 758         if (IS_ERR(dfid))
 759                 return ERR_CAST(dfid);
 760
 761         name = (char *) dentry->d_name.name;
 762         fid = p9_client_walk(dfid, 1, &name, 1);
 763         if (IS_ERR(fid)) {
 764                 result = PTR_ERR(fid);
 765                 if (result == -ENOENT) {
 766                         inode = NULL;
 767                         goto inst_out;
 768                 }
 769
 770                 return ERR_PTR(result);
 771         }
 772
 773         inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 774         if (IS_ERR(inode)) {
 775                 result = PTR_ERR(inode);
 776                 inode = NULL;
 777                 goto error;
 778         }
 779
 780         result = v9fs_fid_add(dentry, fid);
 781         if (result < 0)
 782                 goto error_iput;
 783
 784 inst_out:
 785         d_add(dentry, inode);
 786         return NULL;
 787
 788 error_iput:
 789         iput(inode);
 790 error:
 791         p9_client_clunk(fid);
 792
 793         return ERR_PTR(result);
 794 }
 795
 796 /**
 797  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
 798  * @i:  inode that is being unlinked
 799  * @d: dentry that is being unlinked
 800  *
 801  */
 802
 803 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
 804 {
 805         return v9fs_remove(i, d, 0);
 806 }
 807
 808 /**
 809  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
 810  * @i:  inode that is being unlinked
 811  * @d: dentry that is being unlinked
 812  *
 813  */
 814
 815 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
 816 {
 817         return v9fs_remove(i, d, 1);
 818 }
 819
 820 /**
 821  * v9fs_vfs_rename - VFS hook to rename an inode
 822  * @old_dir:  old dir inode
 823  * @old_dentry: old dentry
 824  * @new_dir: new dir inode
 825  * @new_dentry: new dentry
 826  *
 827  */
 828
 829 int
 830 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 831                 struct inode *new_dir, struct dentry *new_dentry)
 832 {
 833         int retval;
 834         struct inode *old_inode;
 835         struct inode *new_inode;
 836         struct v9fs_session_info *v9ses;
 837         struct p9_fid *oldfid;
 838         struct p9_fid *olddirfid;
 839         struct p9_fid *newdirfid;
 840         struct p9_wstat wstat;
 841
 842         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 843         retval = 0;
 844         old_inode = old_dentry->d_inode;
 845         new_inode = new_dentry->d_inode;
 846         v9ses = v9fs_inode2v9ses(old_inode);
 847         oldfid = v9fs_fid_lookup(old_dentry);
 848         if (IS_ERR(oldfid))
 849                 return PTR_ERR(oldfid);
 850
 851         olddirfid = v9fs_fid_clone(old_dentry->d_parent);
 852         if (IS_ERR(olddirfid)) {
 853                 retval = PTR_ERR(olddirfid);
 854                 goto done;
 855         }
 856
 857         newdirfid = v9fs_fid_clone(new_dentry->d_parent);
 858         if (IS_ERR(newdirfid)) {
 859                 retval = PTR_ERR(newdirfid);
 860                 goto clunk_olddir;
 861         }
 862
 863         down_write(&v9ses->rename_sem);
 864         if (v9fs_proto_dotl(v9ses)) {
 865                 retval = p9_client_rename(oldfid, newdirfid,
 866                                         (char *) new_dentry->d_name.name);
 867                 if (retval != -ENOSYS)
 868                         goto clunk_newdir;
 869         }
 870         if (old_dentry->d_parent != new_dentry->d_parent) {
 871                 /*
 872                  * 9P .u can only handle file rename in the same directory
 873                  */
 874
 875                 P9_DPRINTK(P9_DEBUG_ERROR,
 876                                 "old dir and new dir are different\n");
 877                 retval = -EXDEV;
 878                 goto clunk_newdir;
 879         }
 880         v9fs_blank_wstat(&wstat);
 881         wstat.muid = v9ses->uname;
 882         wstat.name = (char *) new_dentry->d_name.name;
 883         retval = p9_client_wstat(oldfid, &wstat);
 884
 885 clunk_newdir:
 886         if (!retval) {
 887                 if (new_inode) {
 888                         if (S_ISDIR(new_inode->i_mode))
 889                                 clear_nlink(new_inode);
 890                         else
 891                                 drop_nlink(new_inode);
 892                         /*
 893                          * Work around vfs rename rehash bug with
 894                          * FS_RENAME_DOES_D_MOVE
 895                          */
 896                         v9fs_invalidate_inode_attr(new_inode);
 897                 }
 898                 if (S_ISDIR(old_inode->i_mode)) {
 899                         if (!new_inode)
 900                                 inc_nlink(new_dir);
 901                         drop_nlink(old_dir);
 902                 }
 903                 v9fs_invalidate_inode_attr(old_inode);
 904                 v9fs_invalidate_inode_attr(old_dir);
 905                 v9fs_invalidate_inode_attr(new_dir);
 906
 907                 /* successful rename */
 908                 d_move(old_dentry, new_dentry);
 909         }
 910         up_write(&v9ses->rename_sem);
 911         p9_client_clunk(newdirfid);
 912
 913 clunk_olddir:
 914         p9_client_clunk(olddirfid);
 915
 916 done:
 917         return retval;
 918 }
 919
 920 /**
 921  * v9fs_vfs_getattr - retrieve file metadata
 922  * @mnt: mount information
 923  * @dentry: file to get attributes on
 924  * @stat: metadata structure to populate
 925  *
 926  */
 927
 928 static int
 929 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 930                  struct kstat *stat)
 931 {
 932         int err;
 933         struct v9fs_session_info *v9ses;
 934         struct p9_fid *fid;
 935         struct p9_wstat *st;
 936
 937         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 938         err = -EPERM;
 939         v9ses = v9fs_dentry2v9ses(dentry);
 940         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 941                 generic_fillattr(dentry->d_inode, stat);
 942                 return 0;
 943         }
 944         fid = v9fs_fid_lookup(dentry);
 945         if (IS_ERR(fid))
 946                 return PTR_ERR(fid);
 947
 948         st = p9_client_stat(fid);
 949         if (IS_ERR(st))
 950                 return PTR_ERR(st);
 951
 952         v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
 953                 generic_fillattr(dentry->d_inode, stat);
 954
 955         p9stat_free(st);
 956         kfree(st);
 957         return 0;
 958 }
 959
 960 /**
 961  * v9fs_vfs_setattr - set file metadata
 962  * @dentry: file whose metadata to set
 963  * @iattr: metadata assignment structure
 964  *
 965  */
 966
 967 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 968 {
 969         int retval;
 970         struct v9fs_session_info *v9ses;
 971         struct p9_fid *fid;
 972         struct p9_wstat wstat;
 973
 974         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 975         retval = inode_change_ok(dentry->d_inode, iattr);
 976         if (retval)
 977                 return retval;
 978
 979         retval = -EPERM;
 980         v9ses = v9fs_dentry2v9ses(dentry);
 981         fid = v9fs_fid_lookup(dentry);
 982         if(IS_ERR(fid))
 983                 return PTR_ERR(fid);
 984
 985         v9fs_blank_wstat(&wstat);
 986         if (iattr->ia_valid & ATTR_MODE)
 987                 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
 988
 989         if (iattr->ia_valid & ATTR_MTIME)
 990                 wstat.mtime = iattr->ia_mtime.tv_sec;
 991
 992         if (iattr->ia_valid & ATTR_ATIME)
 993                 wstat.atime = iattr->ia_atime.tv_sec;
 994
 995         if (iattr->ia_valid & ATTR_SIZE)
 996                 wstat.length = iattr->ia_size;
 997
 998         if (v9fs_proto_dotu(v9ses)) {
 999                 if (iattr->ia_valid & ATTR_UID)
1000                         wstat.n_uid = iattr->ia_uid;
1001
1002                 if (iattr->ia_valid & ATTR_GID)
1003                         wstat.n_gid = iattr->ia_gid;
1004         }
1005
1006         /* Write all dirty data */
1007         if (S_ISREG(dentry->d_inode->i_mode))
1008                 filemap_write_and_wait(dentry->d_inode->i_mapping);
1009
1010         retval = p9_client_wstat(fid, &wstat);
1011         if (retval < 0)
1012                 return retval;
1013
1014         if ((iattr->ia_valid & ATTR_SIZE) &&
1015             iattr->ia_size != i_size_read(dentry->d_inode))
1016                 truncate_setsize(dentry->d_inode, iattr->ia_size);
1017
1018         v9fs_invalidate_inode_attr(dentry->d_inode);
1019
1020         setattr_copy(dentry->d_inode, iattr);
1021         mark_inode_dirty(dentry->d_inode);
1022         return 0;
1023 }
1024
1025 /**
1026  * v9fs_stat2inode - populate an inode structure with mistat info
1027  * @stat: Plan 9 metadata (mistat) structure
1028  * @inode: inode to populate
1029  * @sb: superblock of filesystem
1030  *
1031  */
1032
1033 void
1034 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1035         struct super_block *sb)
1036 {
1037         char ext[32];
1038         char tag_name[14];
1039         unsigned int i_nlink;
1040         struct v9fs_session_info *v9ses = sb->s_fs_info;
1041         struct v9fs_inode *v9inode = V9FS_I(inode);
1042
1043         inode->i_nlink = 1;
1044
1045         inode->i_atime.tv_sec = stat->atime;
1046         inode->i_mtime.tv_sec = stat->mtime;
1047         inode->i_ctime.tv_sec = stat->mtime;
1048
1049         inode->i_uid = v9ses->dfltuid;
1050         inode->i_gid = v9ses->dfltgid;
1051
1052         if (v9fs_proto_dotu(v9ses)) {
1053                 inode->i_uid = stat->n_uid;
1054                 inode->i_gid = stat->n_gid;
1055         }
1056         if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1057                 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1058                         /*
1059                          * Hadlink support got added later to
1060                          * to the .u extension. So there can be
1061                          * server out there that doesn't support
1062                          * this even with .u extension. So check
1063                          * for non NULL stat->extension
1064                          */
1065                         strncpy(ext, stat->extension, sizeof(ext));
1066                         /* HARDLINKCOUNT %u */
1067                         sscanf(ext, "%13s %u", tag_name, &i_nlink);
1068                         if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1069                                 inode->i_nlink = i_nlink;
1070                 }
1071         }
1072         inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1073         if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1074                 char type = 0;
1075                 int major = -1;
1076                 int minor = -1;
1077
1078                 strncpy(ext, stat->extension, sizeof(ext));
1079                 sscanf(ext, "%c %u %u", &type, &major, &minor);
1080                 switch (type) {
1081                 case 'c':
1082                         inode->i_mode &= ~S_IFBLK;
1083                         inode->i_mode |= S_IFCHR;
1084                         break;
1085                 case 'b':
1086                         break;
1087                 default:
1088                         P9_DPRINTK(P9_DEBUG_ERROR,
1089                                 "Unknown special type %c %s\n", type,
1090                                 stat->extension);
1091                 };
1092                 inode->i_rdev = MKDEV(major, minor);
1093                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1094         } else
1095                 inode->i_rdev = 0;
1096
1097         i_size_write(inode, stat->length);
1098
1099         /* not real number of blocks, but 512 byte ones ... */
1100         inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1101         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1102 }
1103
1104 /**
1105  * v9fs_qid2ino - convert qid into inode number
1106  * @qid: qid to hash
1107  *
1108  * BUG: potential for inode number collisions?
1109  */
1110
1111 ino_t v9fs_qid2ino(struct p9_qid *qid)
1112 {
1113         u64 path = qid->path + 2;
1114         ino_t i = 0;
1115
1116         if (sizeof(ino_t) == sizeof(path))
1117                 memcpy(&i, &path, sizeof(ino_t));
1118         else
1119                 i = (ino_t) (path ^ (path >> 32));
1120
1121         return i;
1122 }
1123
1124 /**
1125  * v9fs_readlink - read a symlink's location (internal version)
1126  * @dentry: dentry for symlink
1127  * @buffer: buffer to load symlink location into
1128  * @buflen: length of buffer
1129  *
1130  */
1131
1132 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1133 {
1134         int retval;
1135
1136         struct v9fs_session_info *v9ses;
1137         struct p9_fid *fid;
1138         struct p9_wstat *st;
1139
1140         P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1141         retval = -EPERM;
1142         v9ses = v9fs_dentry2v9ses(dentry);
1143         fid = v9fs_fid_lookup(dentry);
1144         if (IS_ERR(fid))
1145                 return PTR_ERR(fid);
1146
1147         if (!v9fs_proto_dotu(v9ses))
1148                 return -EBADF;
1149
1150         st = p9_client_stat(fid);
1151         if (IS_ERR(st))
1152                 return PTR_ERR(st);
1153
1154         if (!(st->mode & P9_DMSYMLINK)) {
1155                 retval = -EINVAL;
1156                 goto done;
1157         }
1158
1159         /* copy extension buffer into buffer */
1160         strncpy(buffer, st->extension, buflen);
1161
1162         P9_DPRINTK(P9_DEBUG_VFS,
1163                 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1164
1165         retval = strnlen(buffer, buflen);
1166 done:
1167         p9stat_free(st);
1168         kfree(st);
1169         return retval;
1170 }
1171
1172 /**
1173  * v9fs_vfs_follow_link - follow a symlink path
1174  * @dentry: dentry for symlink
1175  * @nd: nameidata
1176  *
1177  */
1178
1179 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1180 {
1181         int len = 0;
1182         char *link = __getname();
1183
1184         P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1185
1186         if (!link)
1187                 link = ERR_PTR(-ENOMEM);
1188         else {
1189                 len = v9fs_readlink(dentry, link, PATH_MAX);
1190
1191                 if (len < 0) {
1192                         __putname(link);
1193                         link = ERR_PTR(len);
1194                 } else
1195                         link[min(len, PATH_MAX-1)] = 0;
1196         }
1197         nd_set_link(nd, link);
1198
1199         return NULL;
1200 }
1201
1202 /**
1203  * v9fs_vfs_put_link - release a symlink path
1204  * @dentry: dentry for symlink
1205  * @nd: nameidata
1206  * @p: unused
1207  *
1208  */
1209
1210 void
1211 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1212 {
1213         char *s = nd_get_link(nd);
1214
1215         P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1216                 IS_ERR(s) ? "<error>" : s);
1217         if (!IS_ERR(s))
1218                 __putname(s);
1219 }
1220
1221 /**
1222  * v9fs_vfs_mkspecial - create a special file
1223  * @dir: inode to create special file in
1224  * @dentry: dentry to create
1225  * @mode: mode to create special file
1226  * @extension: 9p2000.u format extension string representing special file
1227  *
1228  */
1229
1230 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1231         int mode, const char *extension)
1232 {
1233         u32 perm;
1234         struct p9_fid *fid;
1235         struct v9fs_session_info *v9ses;
1236
1237         v9ses = v9fs_inode2v9ses(dir);
1238         if (!v9fs_proto_dotu(v9ses)) {
1239                 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1240                 return -EPERM;
1241         }
1242
1243         perm = unixmode2p9mode(v9ses, mode);
1244         fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1245                                                                 P9_OREAD);
1246         if (IS_ERR(fid))
1247                 return PTR_ERR(fid);
1248
1249         v9fs_invalidate_inode_attr(dir);
1250         p9_client_clunk(fid);
1251         return 0;
1252 }
1253
1254 /**
1255  * v9fs_vfs_symlink - helper function to create symlinks
1256  * @dir: directory inode containing symlink
1257  * @dentry: dentry for symlink
1258  * @symname: symlink data
1259  *
1260  * See Also: 9P2000.u RFC for more information
1261  *
1262  */
1263
1264 static int
1265 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1266 {
1267         P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1268                                         dentry->d_name.name, symname);
1269
1270         return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1271 }
1272
1273 /**
1274  * v9fs_vfs_link - create a hardlink
1275  * @old_dentry: dentry for file to link to
1276  * @dir: inode destination for new link
1277  * @dentry: dentry for link
1278  *
1279  */
1280
1281 static int
1282 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1283               struct dentry *dentry)
1284 {
1285         int retval;
1286         char *name;
1287         struct p9_fid *oldfid;
1288
1289         P9_DPRINTK(P9_DEBUG_VFS,
1290                 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1291                 old_dentry->d_name.name);
1292
1293         oldfid = v9fs_fid_clone(old_dentry);
1294         if (IS_ERR(oldfid))
1295                 return PTR_ERR(oldfid);
1296
1297         name = __getname();
1298         if (unlikely(!name)) {
1299                 retval = -ENOMEM;
1300                 goto clunk_fid;
1301         }
1302
1303         sprintf(name, "%d\n", oldfid->fid);
1304         retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1305         __putname(name);
1306         if (!retval) {
1307                 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1308                 v9fs_invalidate_inode_attr(dir);
1309         }
1310 clunk_fid:
1311         p9_client_clunk(oldfid);
1312         return retval;
1313 }
1314
1315 /**
1316  * v9fs_vfs_mknod - create a special file
1317  * @dir: inode destination for new link
1318  * @dentry: dentry for file
1319  * @mode: mode for creation
1320  * @rdev: device associated with special file
1321  *
1322  */
1323
1324 static int
1325 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1326 {
1327         int retval;
1328         char *name;
1329
1330         P9_DPRINTK(P9_DEBUG_VFS,
1331                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1332                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1333
1334         if (!new_valid_dev(rdev))
1335                 return -EINVAL;
1336
1337         name = __getname();
1338         if (!name)
1339                 return -ENOMEM;
1340         /* build extension */
1341         if (S_ISBLK(mode))
1342                 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1343         else if (S_ISCHR(mode))
1344                 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1345         else if (S_ISFIFO(mode))
1346                 *name = 0;
1347         else if (S_ISSOCK(mode))
1348                 *name = 0;
1349         else {
1350                 __putname(name);
1351                 return -EINVAL;
1352         }
1353
1354         retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1355         __putname(name);
1356
1357         return retval;
1358 }
1359
1360 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1361 {
1362         loff_t i_size;
1363         struct p9_wstat *st;
1364         struct v9fs_session_info *v9ses;
1365
1366         v9ses = v9fs_inode2v9ses(inode);
1367         st = p9_client_stat(fid);
1368         if (IS_ERR(st))
1369                 return PTR_ERR(st);
1370
1371         spin_lock(&inode->i_lock);
1372         /*
1373          * We don't want to refresh inode->i_size,
1374          * because we may have cached data
1375          */
1376         i_size = inode->i_size;
1377         v9fs_stat2inode(st, inode, inode->i_sb);
1378         if (v9ses->cache)
1379                 inode->i_size = i_size;
1380         spin_unlock(&inode->i_lock);
1381         p9stat_free(st);
1382         kfree(st);
1383         return 0;
1384 }
1385
1386 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1387         .create = v9fs_vfs_create,
1388         .lookup = v9fs_vfs_lookup,
1389         .symlink = v9fs_vfs_symlink,
1390         .link = v9fs_vfs_link,
1391         .unlink = v9fs_vfs_unlink,
1392         .mkdir = v9fs_vfs_mkdir,
1393         .rmdir = v9fs_vfs_rmdir,
1394         .mknod = v9fs_vfs_mknod,
1395         .rename = v9fs_vfs_rename,
1396         .getattr = v9fs_vfs_getattr,
1397         .setattr = v9fs_vfs_setattr,
1398 };
1399
1400 static const struct inode_operations v9fs_dir_inode_operations = {
1401         .create = v9fs_vfs_create,
1402         .lookup = v9fs_vfs_lookup,
1403         .unlink = v9fs_vfs_unlink,
1404         .mkdir = v9fs_vfs_mkdir,
1405         .rmdir = v9fs_vfs_rmdir,
1406         .mknod = v9fs_vfs_mknod,
1407         .rename = v9fs_vfs_rename,
1408         .getattr = v9fs_vfs_getattr,
1409         .setattr = v9fs_vfs_setattr,
1410 };
1411
1412 static const struct inode_operations v9fs_file_inode_operations = {
1413         .getattr = v9fs_vfs_getattr,
1414         .setattr = v9fs_vfs_setattr,
1415 };
1416
1417 static const struct inode_operations v9fs_symlink_inode_operations = {
1418         .readlink = generic_readlink,
1419         .follow_link = v9fs_vfs_follow_link,
1420         .put_link = v9fs_vfs_put_link,
1421         .getattr = v9fs_vfs_getattr,
1422         .setattr = v9fs_vfs_setattr,
1423 };
1424