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