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 <net/9p/9p.h>
  40 #include <net/9p/client.h>
  41
  42 #include "v9fs.h"
  43 #include "v9fs_vfs.h"
  44 #include "fid.h"
  45 #include "cache.h"
  46 #include "xattr.h"
  47
  48 static const struct inode_operations v9fs_dir_inode_operations;
  49 static const struct inode_operations v9fs_dir_inode_operations_dotu;
  50 static const struct inode_operations v9fs_dir_inode_operations_dotl;
  51 static const struct inode_operations v9fs_file_inode_operations;
  52 static const struct inode_operations v9fs_file_inode_operations_dotl;
  53 static const struct inode_operations v9fs_symlink_inode_operations;
  54 static const struct inode_operations v9fs_symlink_inode_operations_dotl;
  55
  56 /**
  57  * unixmode2p9mode - convert unix mode bits to plan 9
  58  * @v9ses: v9fs session information
  59  * @mode: mode to convert
  60  *
  61  */
  62
  63 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
  64 {
  65         int res;
  66         res = mode & 0777;
  67         if (S_ISDIR(mode))
  68                 res |= P9_DMDIR;
  69         if (v9fs_proto_dotu(v9ses)) {
  70                 if (S_ISLNK(mode))
  71                         res |= P9_DMSYMLINK;
  72                 if (v9ses->nodev == 0) {
  73                         if (S_ISSOCK(mode))
  74                                 res |= P9_DMSOCKET;
  75                         if (S_ISFIFO(mode))
  76                                 res |= P9_DMNAMEDPIPE;
  77                         if (S_ISBLK(mode))
  78                                 res |= P9_DMDEVICE;
  79                         if (S_ISCHR(mode))
  80                                 res |= P9_DMDEVICE;
  81                 }
  82
  83                 if ((mode & S_ISUID) == S_ISUID)
  84                         res |= P9_DMSETUID;
  85                 if ((mode & S_ISGID) == S_ISGID)
  86                         res |= P9_DMSETGID;
  87                 if ((mode & S_ISVTX) == S_ISVTX)
  88                         res |= P9_DMSETVTX;
  89                 if ((mode & P9_DMLINK))
  90                         res |= P9_DMLINK;
  91         }
  92
  93         return res;
  94 }
  95
  96 /**
  97  * p9mode2unixmode- convert plan9 mode bits to unix mode bits
  98  * @v9ses: v9fs session information
  99  * @mode: mode to convert
 100  *
 101  */
 102
 103 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
 104 {
 105         int res;
 106
 107         res = mode & 0777;
 108
 109         if ((mode & P9_DMDIR) == P9_DMDIR)
 110                 res |= S_IFDIR;
 111         else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
 112                 res |= S_IFLNK;
 113         else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
 114                  && (v9ses->nodev == 0))
 115                 res |= S_IFSOCK;
 116         else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
 117                  && (v9ses->nodev == 0))
 118                 res |= S_IFIFO;
 119         else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
 120                  && (v9ses->nodev == 0))
 121                 res |= S_IFBLK;
 122         else
 123                 res |= S_IFREG;
 124
 125         if (v9fs_proto_dotu(v9ses)) {
 126                 if ((mode & P9_DMSETUID) == P9_DMSETUID)
 127                         res |= S_ISUID;
 128
 129                 if ((mode & P9_DMSETGID) == P9_DMSETGID)
 130                         res |= S_ISGID;
 131
 132                 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
 133                         res |= S_ISVTX;
 134         }
 135
 136         return res;
 137 }
 138
 139 /**
 140  * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
 141  * @uflags: flags to convert
 142  * @extended: if .u extensions are active
 143  */
 144
 145 int v9fs_uflags2omode(int uflags, int extended)
 146 {
 147         int ret;
 148
 149         ret = 0;
 150         switch (uflags&3) {
 151         default:
 152         case O_RDONLY:
 153                 ret = P9_OREAD;
 154                 break;
 155
 156         case O_WRONLY:
 157                 ret = P9_OWRITE;
 158                 break;
 159
 160         case O_RDWR:
 161                 ret = P9_ORDWR;
 162                 break;
 163         }
 164
 165         if (uflags & O_TRUNC)
 166                 ret |= P9_OTRUNC;
 167
 168         if (extended) {
 169                 if (uflags & O_EXCL)
 170                         ret |= P9_OEXCL;
 171
 172                 if (uflags & O_APPEND)
 173                         ret |= P9_OAPPEND;
 174         }
 175
 176         return ret;
 177 }
 178
 179 /**
 180  * v9fs_blank_wstat - helper function to setup a 9P stat structure
 181  * @wstat: structure to initialize
 182  *
 183  */
 184
 185 void
 186 v9fs_blank_wstat(struct p9_wstat *wstat)
 187 {
 188         wstat->type = ~0;
 189         wstat->dev = ~0;
 190         wstat->qid.type = ~0;
 191         wstat->qid.version = ~0;
 192         *((long long *)&wstat->qid.path) = ~0;
 193         wstat->mode = ~0;
 194         wstat->atime = ~0;
 195         wstat->mtime = ~0;
 196         wstat->length = ~0;
 197         wstat->name = NULL;
 198         wstat->uid = NULL;
 199         wstat->gid = NULL;
 200         wstat->muid = NULL;
 201         wstat->n_uid = ~0;
 202         wstat->n_gid = ~0;
 203         wstat->n_muid = ~0;
 204         wstat->extension = NULL;
 205 }
 206
 207 #ifdef CONFIG_9P_FSCACHE
 208 /**
 209  * v9fs_alloc_inode - helper function to allocate an inode
 210  * This callback is executed before setting up the inode so that we
 211  * can associate a vcookie with each inode.
 212  *
 213  */
 214
 215 struct inode *v9fs_alloc_inode(struct super_block *sb)
 216 {
 217         struct v9fs_cookie *vcookie;
 218         vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
 219                                                          GFP_KERNEL);
 220         if (!vcookie)
 221                 return NULL;
 222
 223         vcookie->fscache = NULL;
 224         vcookie->qid = NULL;
 225         spin_lock_init(&vcookie->lock);
 226         return &vcookie->inode;
 227 }
 228
 229 /**
 230  * v9fs_destroy_inode - destroy an inode
 231  *
 232  */
 233
 234 void v9fs_destroy_inode(struct inode *inode)
 235 {
 236         kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
 237 }
 238 #endif
 239
 240 /**
 241  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
 242  * new file system object. This checks the S_ISGID to determine the owning
 243  * group of the new file system object.
 244  */
 245
 246 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
 247 {
 248         BUG_ON(dir_inode == NULL);
 249
 250         if (dir_inode->i_mode & S_ISGID) {
 251                 /* set_gid bit is set.*/
 252                 return dir_inode->i_gid;
 253         }
 254         return current_fsgid();
 255 }
 256
 257 /**
 258  * v9fs_dentry_from_dir_inode - helper function to get the dentry from
 259  * dir inode.
 260  *
 261  */
 262
 263 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
 264 {
 265         struct dentry *dentry;
 266
 267         spin_lock(&dcache_lock);
 268         /* Directory should have only one entry. */
 269         BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
 270         dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
 271         spin_unlock(&dcache_lock);
 272         return dentry;
 273 }
 274
 275 /**
 276  * v9fs_get_inode - helper function to setup an inode
 277  * @sb: superblock
 278  * @mode: mode to setup inode with
 279  *
 280  */
 281
 282 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 283 {
 284         int err;
 285         struct inode *inode;
 286         struct v9fs_session_info *v9ses = sb->s_fs_info;
 287
 288         P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
 289
 290         inode = new_inode(sb);
 291         if (!inode) {
 292                 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
 293                 return ERR_PTR(-ENOMEM);
 294         }
 295
 296         inode_init_owner(inode, NULL, mode);
 297         inode->i_blocks = 0;
 298         inode->i_rdev = 0;
 299         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 300         inode->i_mapping->a_ops = &v9fs_addr_operations;
 301
 302         switch (mode & S_IFMT) {
 303         case S_IFIFO:
 304         case S_IFBLK:
 305         case S_IFCHR:
 306         case S_IFSOCK:
 307                 if (v9fs_proto_dotl(v9ses)) {
 308                         inode->i_op = &v9fs_file_inode_operations_dotl;
 309                         inode->i_fop = &v9fs_file_operations_dotl;
 310                 } else if (v9fs_proto_dotu(v9ses)) {
 311                         inode->i_op = &v9fs_file_inode_operations;
 312                         inode->i_fop = &v9fs_file_operations;
 313                 } else {
 314                         P9_DPRINTK(P9_DEBUG_ERROR,
 315                                    "special files without extended mode\n");
 316                         err = -EINVAL;
 317                         goto error;
 318                 }
 319                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 320                 break;
 321         case S_IFREG:
 322                 if (v9fs_proto_dotl(v9ses)) {
 323                         inode->i_op = &v9fs_file_inode_operations_dotl;
 324                         inode->i_fop = &v9fs_file_operations_dotl;
 325                 } else {
 326                         inode->i_op = &v9fs_file_inode_operations;
 327                         inode->i_fop = &v9fs_file_operations;
 328                 }
 329
 330                 break;
 331
 332         case S_IFLNK:
 333                 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
 334                         P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
 335                                                 "legacy protocol.\n");
 336                         err = -EINVAL;
 337                         goto error;
 338                 }
 339
 340                 if (v9fs_proto_dotl(v9ses))
 341                         inode->i_op = &v9fs_symlink_inode_operations_dotl;
 342                 else
 343                         inode->i_op = &v9fs_symlink_inode_operations;
 344
 345                 break;
 346         case S_IFDIR:
 347                 inc_nlink(inode);
 348                 if (v9fs_proto_dotl(v9ses))
 349                         inode->i_op = &v9fs_dir_inode_operations_dotl;
 350                 else if (v9fs_proto_dotu(v9ses))
 351                         inode->i_op = &v9fs_dir_inode_operations_dotu;
 352                 else
 353                         inode->i_op = &v9fs_dir_inode_operations;
 354
 355                 if (v9fs_proto_dotl(v9ses))
 356                         inode->i_fop = &v9fs_dir_operations_dotl;
 357                 else
 358                         inode->i_fop = &v9fs_dir_operations;
 359
 360                 break;
 361         default:
 362                 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
 363                            mode, mode & S_IFMT);
 364                 err = -EINVAL;
 365                 goto error;
 366         }
 367
 368         return inode;
 369
 370 error:
 371         iput(inode);
 372         return ERR_PTR(err);
 373 }
 374
 375 /*
 376 static struct v9fs_fid*
 377 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
 378 {
 379         int err;
 380         int nfid;
 381         struct v9fs_fid *ret;
 382         struct v9fs_fcall *fcall;
 383
 384         nfid = v9fs_get_idpool(&v9ses->fidpool);
 385         if (nfid < 0) {
 386                 eprintk(KERN_WARNING, "no free fids available\n");
 387                 return ERR_PTR(-ENOSPC);
 388         }
 389
 390         err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
 391                 &fcall);
 392
 393         if (err < 0) {
 394                 if (fcall && fcall->id == RWALK)
 395                         goto clunk_fid;
 396
 397                 PRINT_FCALL_ERROR("walk error", fcall);
 398                 v9fs_put_idpool(nfid, &v9ses->fidpool);
 399                 goto error;
 400         }
 401
 402         kfree(fcall);
 403         fcall = NULL;
 404         ret = v9fs_fid_create(v9ses, nfid);
 405         if (!ret) {
 406                 err = -ENOMEM;
 407                 goto clunk_fid;
 408         }
 409
 410         err = v9fs_fid_insert(ret, dentry);
 411         if (err < 0) {
 412                 v9fs_fid_destroy(ret);
 413                 goto clunk_fid;
 414         }
 415
 416         return ret;
 417
 418 clunk_fid:
 419         v9fs_t_clunk(v9ses, nfid);
 420
 421 error:
 422         kfree(fcall);
 423         return ERR_PTR(err);
 424 }
 425 */
 426
 427
 428 /**
 429  * v9fs_clear_inode - release an inode
 430  * @inode: inode to release
 431  *
 432  */
 433 void v9fs_evict_inode(struct inode *inode)
 434 {
 435         truncate_inode_pages(inode->i_mapping, 0);
 436         end_writeback(inode);
 437         filemap_fdatawrite(inode->i_mapping);
 438
 439 #ifdef CONFIG_9P_FSCACHE
 440         v9fs_cache_inode_put_cookie(inode);
 441 #endif
 442 }
 443
 444 static struct inode *
 445 v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 446         struct super_block *sb)
 447 {
 448         int err, umode;
 449         struct inode *ret = NULL;
 450         struct p9_wstat *st;
 451
 452         st = p9_client_stat(fid);
 453         if (IS_ERR(st))
 454                 return ERR_CAST(st);
 455
 456         umode = p9mode2unixmode(v9ses, st->mode);
 457         ret = v9fs_get_inode(sb, umode);
 458         if (IS_ERR(ret)) {
 459                 err = PTR_ERR(ret);
 460                 goto error;
 461         }
 462
 463         v9fs_stat2inode(st, ret, sb);
 464         ret->i_ino = v9fs_qid2ino(&st->qid);
 465
 466 #ifdef CONFIG_9P_FSCACHE
 467         v9fs_vcookie_set_qid(ret, &st->qid);
 468         v9fs_cache_inode_get_cookie(ret);
 469 #endif
 470         p9stat_free(st);
 471         kfree(st);
 472         return ret;
 473 error:
 474         p9stat_free(st);
 475         kfree(st);
 476         return ERR_PTR(err);
 477 }
 478
 479 static struct inode *
 480 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 481         struct super_block *sb)
 482 {
 483         struct inode *ret = NULL;
 484         int err;
 485         struct p9_stat_dotl *st;
 486
 487         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
 488         if (IS_ERR(st))
 489                 return ERR_CAST(st);
 490
 491         ret = v9fs_get_inode(sb, st->st_mode);
 492         if (IS_ERR(ret)) {
 493                 err = PTR_ERR(ret);
 494                 goto error;
 495         }
 496
 497         v9fs_stat2inode_dotl(st, ret);
 498         ret->i_ino = v9fs_qid2ino(&st->qid);
 499 #ifdef CONFIG_9P_FSCACHE
 500         v9fs_vcookie_set_qid(ret, &st->qid);
 501         v9fs_cache_inode_get_cookie(ret);
 502 #endif
 503         kfree(st);
 504         return ret;
 505 error:
 506         kfree(st);
 507         return ERR_PTR(err);
 508 }
 509
 510 /**
 511  * v9fs_inode_from_fid - Helper routine to populate an inode by
 512  * issuing a attribute request
 513  * @v9ses: session information
 514  * @fid: fid to issue attribute request for
 515  * @sb: superblock on which to create inode
 516  *
 517  */
 518 static inline struct inode *
 519 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 520                         struct super_block *sb)
 521 {
 522         if (v9fs_proto_dotl(v9ses))
 523                 return v9fs_inode_dotl(v9ses, fid, sb);
 524         else
 525                 return v9fs_inode(v9ses, fid, sb);
 526 }
 527
 528 /**
 529  * v9fs_remove - helper function to remove files and directories
 530  * @dir: directory inode that is being deleted
 531  * @file:  dentry that is being deleted
 532  * @rmdir: removing a directory
 533  *
 534  */
 535
 536 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
 537 {
 538         int retval;
 539         struct inode *file_inode;
 540         struct p9_fid *v9fid;
 541
 542         P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
 543                 rmdir);
 544
 545         file_inode = file->d_inode;
 546         v9fid = v9fs_fid_clone(file);
 547         if (IS_ERR(v9fid))
 548                 return PTR_ERR(v9fid);
 549
 550         retval = p9_client_remove(v9fid);
 551         if (!retval)
 552                 drop_nlink(file_inode);
 553         return retval;
 554 }
 555
 556 static int
 557 v9fs_open_created(struct inode *inode, struct file *file)
 558 {
 559         return 0;
 560 }
 561
 562
 563 /**
 564  * v9fs_create - Create a file
 565  * @v9ses: session information
 566  * @dir: directory that dentry is being created in
 567  * @dentry:  dentry that is being created
 568  * @extension: 9p2000.u extension string to support devices, etc.
 569  * @perm: create permissions
 570  * @mode: open mode
 571  *
 572  */
 573 static struct p9_fid *
 574 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 575                 struct dentry *dentry, char *extension, u32 perm, u8 mode)
 576 {
 577         int err;
 578         char *name;
 579         struct p9_fid *dfid, *ofid, *fid;
 580         struct inode *inode;
 581
 582         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 583
 584         err = 0;
 585         ofid = NULL;
 586         fid = NULL;
 587         name = (char *) dentry->d_name.name;
 588         dfid = v9fs_fid_lookup(dentry->d_parent);
 589         if (IS_ERR(dfid)) {
 590                 err = PTR_ERR(dfid);
 591                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 592                 return ERR_PTR(err);
 593         }
 594
 595         /* clone a fid to use for creation */
 596         ofid = p9_client_walk(dfid, 0, NULL, 1);
 597         if (IS_ERR(ofid)) {
 598                 err = PTR_ERR(ofid);
 599                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 600                 return ERR_PTR(err);
 601         }
 602
 603         err = p9_client_fcreate(ofid, name, perm, mode, extension);
 604         if (err < 0) {
 605                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
 606                 goto error;
 607         }
 608
 609         /* now walk from the parent so we can get unopened fid */
 610         fid = p9_client_walk(dfid, 1, &name, 1);
 611         if (IS_ERR(fid)) {
 612                 err = PTR_ERR(fid);
 613                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 614                 fid = NULL;
 615                 goto error;
 616         }
 617
 618         /* instantiate inode and assign the unopened fid to the dentry */
 619         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 620         if (IS_ERR(inode)) {
 621                 err = PTR_ERR(inode);
 622                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 623                 goto error;
 624         }
 625
 626         if (v9ses->cache)
 627                 dentry->d_op = &v9fs_cached_dentry_operations;
 628         else
 629                 dentry->d_op = &v9fs_dentry_operations;
 630
 631         d_instantiate(dentry, inode);
 632         err = v9fs_fid_add(dentry, fid);
 633         if (err < 0)
 634                 goto error;
 635
 636         return ofid;
 637
 638 error:
 639         if (ofid)
 640                 p9_client_clunk(ofid);
 641
 642         if (fid)
 643                 p9_client_clunk(fid);
 644
 645         return ERR_PTR(err);
 646 }
 647
 648 /**
 649  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 650  * @dir: directory inode that is being created
 651  * @dentry:  dentry that is being deleted
 652  * @mode: create permissions
 653  * @nd: path information
 654  *
 655  */
 656
 657 static int
 658 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode,
 659                 struct nameidata *nd)
 660 {
 661         int err = 0;
 662         char *name = NULL;
 663         gid_t gid;
 664         int flags;
 665         struct v9fs_session_info *v9ses;
 666         struct p9_fid *fid = NULL;
 667         struct p9_fid *dfid, *ofid;
 668         struct file *filp;
 669         struct p9_qid qid;
 670         struct inode *inode;
 671
 672         v9ses = v9fs_inode2v9ses(dir);
 673         if (nd && nd->flags & LOOKUP_OPEN)
 674                 flags = nd->intent.open.flags - 1;
 675         else
 676                 flags = O_RDWR;
 677
 678         name = (char *) dentry->d_name.name;
 679         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 680                         "mode:0x%x\n", name, flags, mode);
 681
 682         dfid = v9fs_fid_lookup(dentry->d_parent);
 683         if (IS_ERR(dfid)) {
 684                 err = PTR_ERR(dfid);
 685                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 686                 return err;
 687         }
 688
 689         /* clone a fid to use for creation */
 690         ofid = p9_client_walk(dfid, 0, NULL, 1);
 691         if (IS_ERR(ofid)) {
 692                 err = PTR_ERR(ofid);
 693                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 694                 return err;
 695         }
 696
 697         gid = v9fs_get_fsgid_for_create(dir);
 698         err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
 699         if (err < 0) {
 700                 P9_DPRINTK(P9_DEBUG_VFS,
 701                                 "p9_client_open_dotl failed in creat %d\n",
 702                                 err);
 703                 goto error;
 704         }
 705
 706         /* No need to populate the inode if we are not opening the file AND
 707          * not in cached mode.
 708          */
 709         if (!v9ses->cache && !(nd && nd->flags & LOOKUP_OPEN)) {
 710                 /* Not in cached mode. No need to populate inode with stat */
 711                 dentry->d_op = &v9fs_dentry_operations;
 712                 p9_client_clunk(ofid);
 713                 d_instantiate(dentry, NULL);
 714                 return 0;
 715         }
 716
 717         /* Now walk from the parent so we can get an unopened fid. */
 718         fid = p9_client_walk(dfid, 1, &name, 1);
 719         if (IS_ERR(fid)) {
 720                 err = PTR_ERR(fid);
 721                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 722                 fid = NULL;
 723                 goto error;
 724         }
 725
 726         /* instantiate inode and assign the unopened fid to dentry */
 727         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 728         if (IS_ERR(inode)) {
 729                 err = PTR_ERR(inode);
 730                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 731                 goto error;
 732         }
 733         dentry->d_op = &v9fs_cached_dentry_operations;
 734         d_instantiate(dentry, inode);
 735         err = v9fs_fid_add(dentry, fid);
 736         if (err < 0)
 737                 goto error;
 738
 739         /* if we are opening a file, assign the open fid to the file */
 740         if (nd && nd->flags & LOOKUP_OPEN) {
 741                 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
 742                 if (IS_ERR(filp)) {
 743                         p9_client_clunk(ofid);
 744                         return PTR_ERR(filp);
 745                 }
 746                 filp->private_data = ofid;
 747         } else
 748                 p9_client_clunk(ofid);
 749
 750         return 0;
 751
 752 error:
 753         if (ofid)
 754                 p9_client_clunk(ofid);
 755         if (fid)
 756                 p9_client_clunk(fid);
 757         return err;
 758 }
 759
 760 /**
 761  * v9fs_vfs_create - VFS hook to create files
 762  * @dir: directory inode that is being created
 763  * @dentry:  dentry that is being deleted
 764  * @mode: create permissions
 765  * @nd: path information
 766  *
 767  */
 768
 769 static int
 770 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
 771                 struct nameidata *nd)
 772 {
 773         int err;
 774         u32 perm;
 775         int flags;
 776         struct v9fs_session_info *v9ses;
 777         struct p9_fid *fid;
 778         struct file *filp;
 779
 780         err = 0;
 781         fid = NULL;
 782         v9ses = v9fs_inode2v9ses(dir);
 783         perm = unixmode2p9mode(v9ses, mode);
 784         if (nd && nd->flags & LOOKUP_OPEN)
 785                 flags = nd->intent.open.flags - 1;
 786         else
 787                 flags = O_RDWR;
 788
 789         fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
 790                                 v9fs_uflags2omode(flags,
 791                                                 v9fs_proto_dotu(v9ses)));
 792         if (IS_ERR(fid)) {
 793                 err = PTR_ERR(fid);
 794                 fid = NULL;
 795                 goto error;
 796         }
 797
 798         /* if we are opening a file, assign the open fid to the file */
 799         if (nd && nd->flags & LOOKUP_OPEN) {
 800                 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
 801                 if (IS_ERR(filp)) {
 802                         err = PTR_ERR(filp);
 803                         goto error;
 804                 }
 805
 806                 filp->private_data = fid;
 807         } else
 808                 p9_client_clunk(fid);
 809
 810         return 0;
 811
 812 error:
 813         if (fid)
 814                 p9_client_clunk(fid);
 815
 816         return err;
 817 }
 818
 819 /**
 820  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
 821  * @dir:  inode that is being unlinked
 822  * @dentry: dentry that is being unlinked
 823  * @mode: mode for new directory
 824  *
 825  */
 826
 827 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 828 {
 829         int err;
 830         u32 perm;
 831         struct v9fs_session_info *v9ses;
 832         struct p9_fid *fid;
 833
 834         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 835         err = 0;
 836         v9ses = v9fs_inode2v9ses(dir);
 837         perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
 838         fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
 839         if (IS_ERR(fid)) {
 840                 err = PTR_ERR(fid);
 841                 fid = NULL;
 842         }
 843
 844         if (fid)
 845                 p9_client_clunk(fid);
 846
 847         return err;
 848 }
 849
 850
 851 /**
 852  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 853  * @dir:  inode that is being unlinked
 854  * @dentry: dentry that is being unlinked
 855  * @mode: mode for new directory
 856  *
 857  */
 858
 859 static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry,
 860                                         int mode)
 861 {
 862         int err;
 863         struct v9fs_session_info *v9ses;
 864         struct p9_fid *fid = NULL, *dfid = NULL;
 865         gid_t gid;
 866         char *name;
 867         struct inode *inode;
 868         struct p9_qid qid;
 869         struct dentry *dir_dentry;
 870
 871         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 872         err = 0;
 873         v9ses = v9fs_inode2v9ses(dir);
 874
 875         mode |= S_IFDIR;
 876         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 877         dfid = v9fs_fid_lookup(dir_dentry);
 878         if (IS_ERR(dfid)) {
 879                 err = PTR_ERR(dfid);
 880                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 881                 dfid = NULL;
 882                 goto error;
 883         }
 884
 885         gid = v9fs_get_fsgid_for_create(dir);
 886         if (gid < 0) {
 887                 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n");
 888                 goto error;
 889         }
 890
 891         name = (char *) dentry->d_name.name;
 892         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 893         if (err < 0)
 894                 goto error;
 895
 896         /* instantiate inode and assign the unopened fid to the dentry */
 897         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 898                 fid = p9_client_walk(dfid, 1, &name, 1);
 899                 if (IS_ERR(fid)) {
 900                         err = PTR_ERR(fid);
 901                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 902                                 err);
 903                         fid = NULL;
 904                         goto error;
 905                 }
 906
 907                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 908                 if (IS_ERR(inode)) {
 909                         err = PTR_ERR(inode);
 910                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 911                                 err);
 912                         goto error;
 913                 }
 914                 dentry->d_op = &v9fs_cached_dentry_operations;
 915                 d_instantiate(dentry, inode);
 916                 err = v9fs_fid_add(dentry, fid);
 917                 if (err < 0)
 918                         goto error;
 919                 fid = NULL;
 920         }
 921 error:
 922         if (fid)
 923                 p9_client_clunk(fid);
 924         return err;
 925 }
 926
 927 /**
 928  * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
 929  * @dir:  inode that is being walked from
 930  * @dentry: dentry that is being walked to?
 931  * @nameidata: path data
 932  *
 933  */
 934
 935 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 936                                       struct nameidata *nameidata)
 937 {
 938         struct super_block *sb;
 939         struct v9fs_session_info *v9ses;
 940         struct p9_fid *dfid, *fid;
 941         struct inode *inode;
 942         char *name;
 943         int result = 0;
 944
 945         P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
 946                 dir, dentry->d_name.name, dentry, nameidata);
 947
 948         if (dentry->d_name.len > NAME_MAX)
 949                 return ERR_PTR(-ENAMETOOLONG);
 950
 951         sb = dir->i_sb;
 952         v9ses = v9fs_inode2v9ses(dir);
 953         /* We can walk d_parent because we hold the dir->i_mutex */
 954         dfid = v9fs_fid_lookup(dentry->d_parent);
 955         if (IS_ERR(dfid))
 956                 return ERR_CAST(dfid);
 957
 958         name = (char *) dentry->d_name.name;
 959         fid = p9_client_walk(dfid, 1, &name, 1);
 960         if (IS_ERR(fid)) {
 961                 result = PTR_ERR(fid);
 962                 if (result == -ENOENT) {
 963                         inode = NULL;
 964                         goto inst_out;
 965                 }
 966
 967                 return ERR_PTR(result);
 968         }
 969
 970         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 971         if (IS_ERR(inode)) {
 972                 result = PTR_ERR(inode);
 973                 inode = NULL;
 974                 goto error;
 975         }
 976
 977         result = v9fs_fid_add(dentry, fid);
 978         if (result < 0)
 979                 goto error;
 980
 981 inst_out:
 982         if (v9ses->cache)
 983                 dentry->d_op = &v9fs_cached_dentry_operations;
 984         else
 985                 dentry->d_op = &v9fs_dentry_operations;
 986
 987         d_add(dentry, inode);
 988         return NULL;
 989
 990 error:
 991         p9_client_clunk(fid);
 992
 993         return ERR_PTR(result);
 994 }
 995
 996 /**
 997  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
 998  * @i:  inode that is being unlinked
 999  * @d: dentry that is being unlinked
1000  *
1001  */
1002
1003 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
1004 {
1005         return v9fs_remove(i, d, 0);
1006 }
1007
1008 /**
1009  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
1010  * @i:  inode that is being unlinked
1011  * @d: dentry that is being unlinked
1012  *
1013  */
1014
1015 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
1016 {
1017         return v9fs_remove(i, d, 1);
1018 }
1019
1020 /**
1021  * v9fs_vfs_rename - VFS hook to rename an inode
1022  * @old_dir:  old dir inode
1023  * @old_dentry: old dentry
1024  * @new_dir: new dir inode
1025  * @new_dentry: new dentry
1026  *
1027  */
1028
1029 static int
1030 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1031                 struct inode *new_dir, struct dentry *new_dentry)
1032 {
1033         struct inode *old_inode;
1034         struct v9fs_session_info *v9ses;
1035         struct p9_fid *oldfid;
1036         struct p9_fid *olddirfid;
1037         struct p9_fid *newdirfid;
1038         struct p9_wstat wstat;
1039         int retval;
1040
1041         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1042         retval = 0;
1043         old_inode = old_dentry->d_inode;
1044         v9ses = v9fs_inode2v9ses(old_inode);
1045         oldfid = v9fs_fid_lookup(old_dentry);
1046         if (IS_ERR(oldfid))
1047                 return PTR_ERR(oldfid);
1048
1049         olddirfid = v9fs_fid_clone(old_dentry->d_parent);
1050         if (IS_ERR(olddirfid)) {
1051                 retval = PTR_ERR(olddirfid);
1052                 goto done;
1053         }
1054
1055         newdirfid = v9fs_fid_clone(new_dentry->d_parent);
1056         if (IS_ERR(newdirfid)) {
1057                 retval = PTR_ERR(newdirfid);
1058                 goto clunk_olddir;
1059         }
1060
1061         down_write(&v9ses->rename_sem);
1062         if (v9fs_proto_dotl(v9ses)) {
1063                 retval = p9_client_rename(oldfid, newdirfid,
1064                                         (char *) new_dentry->d_name.name);
1065                 if (retval != -ENOSYS)
1066                         goto clunk_newdir;
1067         }
1068         if (old_dentry->d_parent != new_dentry->d_parent) {
1069                 /*
1070                  * 9P .u can only handle file rename in the same directory
1071                  */
1072
1073                 P9_DPRINTK(P9_DEBUG_ERROR,
1074                                 "old dir and new dir are different\n");
1075                 retval = -EXDEV;
1076                 goto clunk_newdir;
1077         }
1078         v9fs_blank_wstat(&wstat);
1079         wstat.muid = v9ses->uname;
1080         wstat.name = (char *) new_dentry->d_name.name;
1081         retval = p9_client_wstat(oldfid, &wstat);
1082
1083 clunk_newdir:
1084         if (!retval)
1085                 /* successful rename */
1086                 d_move(old_dentry, new_dentry);
1087         up_write(&v9ses->rename_sem);
1088         p9_client_clunk(newdirfid);
1089
1090 clunk_olddir:
1091         p9_client_clunk(olddirfid);
1092
1093 done:
1094         return retval;
1095 }
1096
1097 /**
1098  * v9fs_vfs_getattr - retrieve file metadata
1099  * @mnt: mount information
1100  * @dentry: file to get attributes on
1101  * @stat: metadata structure to populate
1102  *
1103  */
1104
1105 static int
1106 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1107                  struct kstat *stat)
1108 {
1109         int err;
1110         struct v9fs_session_info *v9ses;
1111         struct p9_fid *fid;
1112         struct p9_wstat *st;
1113
1114         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1115         err = -EPERM;
1116         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1117         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1118                 return simple_getattr(mnt, dentry, stat);
1119
1120         fid = v9fs_fid_lookup(dentry);
1121         if (IS_ERR(fid))
1122                 return PTR_ERR(fid);
1123
1124         st = p9_client_stat(fid);
1125         if (IS_ERR(st))
1126                 return PTR_ERR(st);
1127
1128         v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1129                 generic_fillattr(dentry->d_inode, stat);
1130
1131         kfree(st);
1132         return 0;
1133 }
1134
1135 static int
1136 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
1137                  struct kstat *stat)
1138 {
1139         int err;
1140         struct v9fs_session_info *v9ses;
1141         struct p9_fid *fid;
1142         struct p9_stat_dotl *st;
1143
1144         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1145         err = -EPERM;
1146         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1147         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1148                 return simple_getattr(mnt, dentry, stat);
1149
1150         fid = v9fs_fid_lookup(dentry);
1151         if (IS_ERR(fid))
1152                 return PTR_ERR(fid);
1153
1154         /* Ask for all the fields in stat structure. Server will return
1155          * whatever it supports
1156          */
1157
1158         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
1159         if (IS_ERR(st))
1160                 return PTR_ERR(st);
1161
1162         v9fs_stat2inode_dotl(st, dentry->d_inode);
1163         generic_fillattr(dentry->d_inode, stat);
1164         /* Change block size to what the server returned */
1165         stat->blksize = st->st_blksize;
1166
1167         kfree(st);
1168         return 0;
1169 }
1170
1171 /**
1172  * v9fs_vfs_setattr - set file metadata
1173  * @dentry: file whose metadata to set
1174  * @iattr: metadata assignment structure
1175  *
1176  */
1177
1178 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1179 {
1180         int retval;
1181         struct v9fs_session_info *v9ses;
1182         struct p9_fid *fid;
1183         struct p9_wstat wstat;
1184
1185         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1186         retval = -EPERM;
1187         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1188         fid = v9fs_fid_lookup(dentry);
1189         if(IS_ERR(fid))
1190                 return PTR_ERR(fid);
1191
1192         v9fs_blank_wstat(&wstat);
1193         if (iattr->ia_valid & ATTR_MODE)
1194                 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1195
1196         if (iattr->ia_valid & ATTR_MTIME)
1197                 wstat.mtime = iattr->ia_mtime.tv_sec;
1198
1199         if (iattr->ia_valid & ATTR_ATIME)
1200                 wstat.atime = iattr->ia_atime.tv_sec;
1201
1202         if (iattr->ia_valid & ATTR_SIZE)
1203                 wstat.length = iattr->ia_size;
1204
1205         if (v9fs_proto_dotu(v9ses)) {
1206                 if (iattr->ia_valid & ATTR_UID)
1207                         wstat.n_uid = iattr->ia_uid;
1208
1209                 if (iattr->ia_valid & ATTR_GID)
1210                         wstat.n_gid = iattr->ia_gid;
1211         }
1212
1213         retval = p9_client_wstat(fid, &wstat);
1214         if (retval < 0)
1215                 return retval;
1216
1217         if ((iattr->ia_valid & ATTR_SIZE) &&
1218             iattr->ia_size != i_size_read(dentry->d_inode)) {
1219                 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1220                 if (retval)
1221                         return retval;
1222         }
1223
1224         setattr_copy(dentry->d_inode, iattr);
1225         mark_inode_dirty(dentry->d_inode);
1226         return 0;
1227 }
1228
1229 /**
1230  * v9fs_vfs_setattr_dotl - set file metadata
1231  * @dentry: file whose metadata to set
1232  * @iattr: metadata assignment structure
1233  *
1234  */
1235
1236 static int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
1237 {
1238         int retval;
1239         struct v9fs_session_info *v9ses;
1240         struct p9_fid *fid;
1241         struct p9_iattr_dotl p9attr;
1242
1243         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1244
1245         retval = inode_change_ok(dentry->d_inode, iattr);
1246         if (retval)
1247                 return retval;
1248
1249         p9attr.valid = iattr->ia_valid;
1250         p9attr.mode = iattr->ia_mode;
1251         p9attr.uid = iattr->ia_uid;
1252         p9attr.gid = iattr->ia_gid;
1253         p9attr.size = iattr->ia_size;
1254         p9attr.atime_sec = iattr->ia_atime.tv_sec;
1255         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
1256         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
1257         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
1258
1259         retval = -EPERM;
1260         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1261         fid = v9fs_fid_lookup(dentry);
1262         if (IS_ERR(fid))
1263                 return PTR_ERR(fid);
1264
1265         retval = p9_client_setattr(fid, &p9attr);
1266         if (retval < 0)
1267                 return retval;
1268
1269         if ((iattr->ia_valid & ATTR_SIZE) &&
1270             iattr->ia_size != i_size_read(dentry->d_inode)) {
1271                 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1272                 if (retval)
1273                         return retval;
1274         }
1275
1276         setattr_copy(dentry->d_inode, iattr);
1277         mark_inode_dirty(dentry->d_inode);
1278         return 0;
1279 }
1280
1281 /**
1282  * v9fs_stat2inode - populate an inode structure with mistat info
1283  * @stat: Plan 9 metadata (mistat) structure
1284  * @inode: inode to populate
1285  * @sb: superblock of filesystem
1286  *
1287  */
1288
1289 void
1290 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1291         struct super_block *sb)
1292 {
1293         char ext[32];
1294         char tag_name[14];
1295         unsigned int i_nlink;
1296         struct v9fs_session_info *v9ses = sb->s_fs_info;
1297
1298         inode->i_nlink = 1;
1299
1300         inode->i_atime.tv_sec = stat->atime;
1301         inode->i_mtime.tv_sec = stat->mtime;
1302         inode->i_ctime.tv_sec = stat->mtime;
1303
1304         inode->i_uid = v9ses->dfltuid;
1305         inode->i_gid = v9ses->dfltgid;
1306
1307         if (v9fs_proto_dotu(v9ses)) {
1308                 inode->i_uid = stat->n_uid;
1309                 inode->i_gid = stat->n_gid;
1310         }
1311         if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1312                 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1313                         /*
1314                          * Hadlink support got added later to
1315                          * to the .u extension. So there can be
1316                          * server out there that doesn't support
1317                          * this even with .u extension. So check
1318                          * for non NULL stat->extension
1319                          */
1320                         strncpy(ext, stat->extension, sizeof(ext));
1321                         /* HARDLINKCOUNT %u */
1322                         sscanf(ext, "%13s %u", tag_name, &i_nlink);
1323                         if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1324                                 inode->i_nlink = i_nlink;
1325                 }
1326         }
1327         inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1328         if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1329                 char type = 0;
1330                 int major = -1;
1331                 int minor = -1;
1332
1333                 strncpy(ext, stat->extension, sizeof(ext));
1334                 sscanf(ext, "%c %u %u", &type, &major, &minor);
1335                 switch (type) {
1336                 case 'c':
1337                         inode->i_mode &= ~S_IFBLK;
1338                         inode->i_mode |= S_IFCHR;
1339                         break;
1340                 case 'b':
1341                         break;
1342                 default:
1343                         P9_DPRINTK(P9_DEBUG_ERROR,
1344                                 "Unknown special type %c %s\n", type,
1345                                 stat->extension);
1346                 };
1347                 inode->i_rdev = MKDEV(major, minor);
1348                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1349         } else
1350                 inode->i_rdev = 0;
1351
1352         i_size_write(inode, stat->length);
1353
1354         /* not real number of blocks, but 512 byte ones ... */
1355         inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1356 }
1357
1358 /**
1359  * v9fs_stat2inode_dotl - populate an inode structure with stat info
1360  * @stat: stat structure
1361  * @inode: inode to populate
1362  * @sb: superblock of filesystem
1363  *
1364  */
1365
1366 void
1367 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
1368 {
1369
1370         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
1371                 inode->i_atime.tv_sec = stat->st_atime_sec;
1372                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
1373                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
1374                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1375                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
1376                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1377                 inode->i_uid = stat->st_uid;
1378                 inode->i_gid = stat->st_gid;
1379                 inode->i_nlink = stat->st_nlink;
1380                 inode->i_mode = stat->st_mode;
1381                 inode->i_rdev = new_decode_dev(stat->st_rdev);
1382
1383                 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
1384                         init_special_inode(inode, inode->i_mode, inode->i_rdev);
1385
1386                 i_size_write(inode, stat->st_size);
1387                 inode->i_blocks = stat->st_blocks;
1388         } else {
1389                 if (stat->st_result_mask & P9_STATS_ATIME) {
1390                         inode->i_atime.tv_sec = stat->st_atime_sec;
1391                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
1392                 }
1393                 if (stat->st_result_mask & P9_STATS_MTIME) {
1394                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
1395                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1396                 }
1397                 if (stat->st_result_mask & P9_STATS_CTIME) {
1398                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
1399                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1400                 }
1401                 if (stat->st_result_mask & P9_STATS_UID)
1402                         inode->i_uid = stat->st_uid;
1403                 if (stat->st_result_mask & P9_STATS_GID)
1404                         inode->i_gid = stat->st_gid;
1405                 if (stat->st_result_mask & P9_STATS_NLINK)
1406                         inode->i_nlink = stat->st_nlink;
1407                 if (stat->st_result_mask & P9_STATS_MODE) {
1408                         inode->i_mode = stat->st_mode;
1409                         if ((S_ISBLK(inode->i_mode)) ||
1410                                                 (S_ISCHR(inode->i_mode)))
1411                                 init_special_inode(inode, inode->i_mode,
1412                                                                 inode->i_rdev);
1413                 }
1414                 if (stat->st_result_mask & P9_STATS_RDEV)
1415                         inode->i_rdev = new_decode_dev(stat->st_rdev);
1416                 if (stat->st_result_mask & P9_STATS_SIZE)
1417                         i_size_write(inode, stat->st_size);
1418                 if (stat->st_result_mask & P9_STATS_BLOCKS)
1419                         inode->i_blocks = stat->st_blocks;
1420         }
1421         if (stat->st_result_mask & P9_STATS_GEN)
1422                         inode->i_generation = stat->st_gen;
1423
1424         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
1425          * because the inode structure does not have fields for them.
1426          */
1427 }
1428
1429 /**
1430  * v9fs_qid2ino - convert qid into inode number
1431  * @qid: qid to hash
1432  *
1433  * BUG: potential for inode number collisions?
1434  */
1435
1436 ino_t v9fs_qid2ino(struct p9_qid *qid)
1437 {
1438         u64 path = qid->path + 2;
1439         ino_t i = 0;
1440
1441         if (sizeof(ino_t) == sizeof(path))
1442                 memcpy(&i, &path, sizeof(ino_t));
1443         else
1444                 i = (ino_t) (path ^ (path >> 32));
1445
1446         return i;
1447 }
1448
1449 /**
1450  * v9fs_readlink - read a symlink's location (internal version)
1451  * @dentry: dentry for symlink
1452  * @buffer: buffer to load symlink location into
1453  * @buflen: length of buffer
1454  *
1455  */
1456
1457 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1458 {
1459         int retval;
1460
1461         struct v9fs_session_info *v9ses;
1462         struct p9_fid *fid;
1463         struct p9_wstat *st;
1464
1465         P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1466         retval = -EPERM;
1467         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1468         fid = v9fs_fid_lookup(dentry);
1469         if (IS_ERR(fid))
1470                 return PTR_ERR(fid);
1471
1472         if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))
1473                 return -EBADF;
1474
1475         st = p9_client_stat(fid);
1476         if (IS_ERR(st))
1477                 return PTR_ERR(st);
1478
1479         if (!(st->mode & P9_DMSYMLINK)) {
1480                 retval = -EINVAL;
1481                 goto done;
1482         }
1483
1484         /* copy extension buffer into buffer */
1485         strncpy(buffer, st->extension, buflen);
1486
1487         P9_DPRINTK(P9_DEBUG_VFS,
1488                 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1489
1490         retval = strnlen(buffer, buflen);
1491 done:
1492         kfree(st);
1493         return retval;
1494 }
1495
1496 /**
1497  * v9fs_vfs_follow_link - follow a symlink path
1498  * @dentry: dentry for symlink
1499  * @nd: nameidata
1500  *
1501  */
1502
1503 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1504 {
1505         int len = 0;
1506         char *link = __getname();
1507
1508         P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1509
1510         if (!link)
1511                 link = ERR_PTR(-ENOMEM);
1512         else {
1513                 len = v9fs_readlink(dentry, link, PATH_MAX);
1514
1515                 if (len < 0) {
1516                         __putname(link);
1517                         link = ERR_PTR(len);
1518                 } else
1519                         link[min(len, PATH_MAX-1)] = 0;
1520         }
1521         nd_set_link(nd, link);
1522
1523         return NULL;
1524 }
1525
1526 /**
1527  * v9fs_vfs_put_link - release a symlink path
1528  * @dentry: dentry for symlink
1529  * @nd: nameidata
1530  * @p: unused
1531  *
1532  */
1533
1534 static void
1535 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1536 {
1537         char *s = nd_get_link(nd);
1538
1539         P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1540                 IS_ERR(s) ? "<error>" : s);
1541         if (!IS_ERR(s))
1542                 __putname(s);
1543 }
1544
1545 /**
1546  * v9fs_vfs_mkspecial - create a special file
1547  * @dir: inode to create special file in
1548  * @dentry: dentry to create
1549  * @mode: mode to create special file
1550  * @extension: 9p2000.u format extension string representing special file
1551  *
1552  */
1553
1554 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1555         int mode, const char *extension)
1556 {
1557         u32 perm;
1558         struct v9fs_session_info *v9ses;
1559         struct p9_fid *fid;
1560
1561         v9ses = v9fs_inode2v9ses(dir);
1562         if (!v9fs_proto_dotu(v9ses)) {
1563                 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1564                 return -EPERM;
1565         }
1566
1567         perm = unixmode2p9mode(v9ses, mode);
1568         fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1569                                                                 P9_OREAD);
1570         if (IS_ERR(fid))
1571                 return PTR_ERR(fid);
1572
1573         p9_client_clunk(fid);
1574         return 0;
1575 }
1576
1577 /**
1578  * v9fs_vfs_symlink_dotl - helper function to create symlinks
1579  * @dir: directory inode containing symlink
1580  * @dentry: dentry for symlink
1581  * @symname: symlink data
1582  *
1583  * See Also: 9P2000.L RFC for more information
1584  *
1585  */
1586
1587 static int
1588 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
1589                 const char *symname)
1590 {
1591         struct v9fs_session_info *v9ses;
1592         struct p9_fid *dfid;
1593         struct p9_fid *fid = NULL;
1594         struct inode *inode;
1595         struct p9_qid qid;
1596         char *name;
1597         int err;
1598         gid_t gid;
1599
1600         name = (char *) dentry->d_name.name;
1601         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
1602                         dir->i_ino, name, symname);
1603         v9ses = v9fs_inode2v9ses(dir);
1604
1605         dfid = v9fs_fid_lookup(dentry->d_parent);
1606         if (IS_ERR(dfid)) {
1607                 err = PTR_ERR(dfid);
1608                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1609                 return err;
1610         }
1611
1612         gid = v9fs_get_fsgid_for_create(dir);
1613
1614         if (gid < 0) {
1615                 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_egid failed %d\n", gid);
1616                 goto error;
1617         }
1618
1619         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
1620         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
1621
1622         if (err < 0) {
1623                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
1624                 goto error;
1625         }
1626
1627         if (v9ses->cache) {
1628                 /* Now walk from the parent so we can get an unopened fid. */
1629                 fid = p9_client_walk(dfid, 1, &name, 1);
1630                 if (IS_ERR(fid)) {
1631                         err = PTR_ERR(fid);
1632                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1633                                         err);
1634                         fid = NULL;
1635                         goto error;
1636                 }
1637
1638                 /* instantiate inode and assign the unopened fid to dentry */
1639                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1640                 if (IS_ERR(inode)) {
1641                         err = PTR_ERR(inode);
1642                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1643                                         err);
1644                         goto error;
1645                 }
1646                 dentry->d_op = &v9fs_cached_dentry_operations;
1647                 d_instantiate(dentry, inode);
1648                 err = v9fs_fid_add(dentry, fid);
1649                 if (err < 0)
1650                         goto error;
1651                 fid = NULL;
1652         } else {
1653                 /* Not in cached mode. No need to populate inode with stat */
1654                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
1655                 if (IS_ERR(inode)) {
1656                         err = PTR_ERR(inode);
1657                         goto error;
1658                 }
1659                 dentry->d_op = &v9fs_dentry_operations;
1660                 d_instantiate(dentry, inode);
1661         }
1662
1663 error:
1664         if (fid)
1665                 p9_client_clunk(fid);
1666
1667         return err;
1668 }
1669
1670 /**
1671  * v9fs_vfs_symlink - helper function to create symlinks
1672  * @dir: directory inode containing symlink
1673  * @dentry: dentry for symlink
1674  * @symname: symlink data
1675  *
1676  * See Also: 9P2000.u RFC for more information
1677  *
1678  */
1679
1680 static int
1681 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1682 {
1683         P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1684                                         dentry->d_name.name, symname);
1685
1686         return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1687 }
1688
1689 /**
1690  * v9fs_vfs_link - create a hardlink
1691  * @old_dentry: dentry for file to link to
1692  * @dir: inode destination for new link
1693  * @dentry: dentry for link
1694  *
1695  */
1696
1697 static int
1698 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1699               struct dentry *dentry)
1700 {
1701         int retval;
1702         struct p9_fid *oldfid;
1703         char *name;
1704
1705         P9_DPRINTK(P9_DEBUG_VFS,
1706                 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1707                 old_dentry->d_name.name);
1708
1709         oldfid = v9fs_fid_clone(old_dentry);
1710         if (IS_ERR(oldfid))
1711                 return PTR_ERR(oldfid);
1712
1713         name = __getname();
1714         if (unlikely(!name)) {
1715                 retval = -ENOMEM;
1716                 goto clunk_fid;
1717         }
1718
1719         sprintf(name, "%d\n", oldfid->fid);
1720         retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1721         __putname(name);
1722
1723 clunk_fid:
1724         p9_client_clunk(oldfid);
1725         return retval;
1726 }
1727
1728 /**
1729  * v9fs_vfs_link_dotl - create a hardlink for dotl
1730  * @old_dentry: dentry for file to link to
1731  * @dir: inode destination for new link
1732  * @dentry: dentry for link
1733  *
1734  */
1735
1736 static int
1737 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
1738                 struct dentry *dentry)
1739 {
1740         int err;
1741         struct p9_fid *dfid, *oldfid;
1742         char *name;
1743         struct v9fs_session_info *v9ses;
1744         struct dentry *dir_dentry;
1745
1746         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
1747                         dir->i_ino, old_dentry->d_name.name,
1748                         dentry->d_name.name);
1749
1750         v9ses = v9fs_inode2v9ses(dir);
1751         dir_dentry = v9fs_dentry_from_dir_inode(dir);
1752         dfid = v9fs_fid_lookup(dir_dentry);
1753         if (IS_ERR(dfid))
1754                 return PTR_ERR(dfid);
1755
1756         oldfid = v9fs_fid_lookup(old_dentry);
1757         if (IS_ERR(oldfid))
1758                 return PTR_ERR(oldfid);
1759
1760         name = (char *) dentry->d_name.name;
1761
1762         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
1763
1764         if (err < 0) {
1765                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
1766                 return err;
1767         }
1768
1769         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1770                 /* Get the latest stat info from server. */
1771                 struct p9_fid *fid;
1772                 struct p9_stat_dotl *st;
1773
1774                 fid = v9fs_fid_lookup(old_dentry);
1775                 if (IS_ERR(fid))
1776                         return PTR_ERR(fid);
1777
1778                 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
1779                 if (IS_ERR(st))
1780                         return PTR_ERR(st);
1781
1782                 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
1783
1784                 kfree(st);
1785         } else {
1786                 /* Caching disabled. No need to get upto date stat info.
1787                  * This dentry will be released immediately. So, just i_count++
1788                  */
1789                 atomic_inc(&old_dentry->d_inode->i_count);
1790         }
1791
1792         dentry->d_op = old_dentry->d_op;
1793         d_instantiate(dentry, old_dentry->d_inode);
1794
1795         return err;
1796 }
1797
1798 /**
1799  * v9fs_vfs_mknod - create a special file
1800  * @dir: inode destination for new link
1801  * @dentry: dentry for file
1802  * @mode: mode for creation
1803  * @rdev: device associated with special file
1804  *
1805  */
1806
1807 static int
1808 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1809 {
1810         int retval;
1811         char *name;
1812
1813         P9_DPRINTK(P9_DEBUG_VFS,
1814                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1815                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1816
1817         if (!new_valid_dev(rdev))
1818                 return -EINVAL;
1819
1820         name = __getname();
1821         if (!name)
1822                 return -ENOMEM;
1823         /* build extension */
1824         if (S_ISBLK(mode))
1825                 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1826         else if (S_ISCHR(mode))
1827                 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1828         else if (S_ISFIFO(mode))
1829                 *name = 0;
1830         else if (S_ISSOCK(mode))
1831                 *name = 0;
1832         else {
1833                 __putname(name);
1834                 return -EINVAL;
1835         }
1836
1837         retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1838         __putname(name);
1839
1840         return retval;
1841 }
1842
1843 /**
1844  * v9fs_vfs_mknod_dotl - create a special file
1845  * @dir: inode destination for new link
1846  * @dentry: dentry for file
1847  * @mode: mode for creation
1848  * @rdev: device associated with special file
1849  *
1850  */
1851 static int
1852 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
1853                 dev_t rdev)
1854 {
1855         int err;
1856         char *name;
1857         struct v9fs_session_info *v9ses;
1858         struct p9_fid *fid = NULL, *dfid = NULL;
1859         struct inode *inode;
1860         gid_t gid;
1861         struct p9_qid qid;
1862         struct dentry *dir_dentry;
1863
1864         P9_DPRINTK(P9_DEBUG_VFS,
1865                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1866                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1867
1868         if (!new_valid_dev(rdev))
1869                 return -EINVAL;
1870
1871         v9ses = v9fs_inode2v9ses(dir);
1872         dir_dentry = v9fs_dentry_from_dir_inode(dir);
1873         dfid = v9fs_fid_lookup(dir_dentry);
1874         if (IS_ERR(dfid)) {
1875                 err = PTR_ERR(dfid);
1876                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1877                 dfid = NULL;
1878                 goto error;
1879         }
1880
1881         gid = v9fs_get_fsgid_for_create(dir);
1882         if (gid < 0) {
1883                 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n");
1884                 goto error;
1885         }
1886
1887         name = (char *) dentry->d_name.name;
1888
1889         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
1890         if (err < 0)
1891                 goto error;
1892
1893         /* instantiate inode and assign the unopened fid to the dentry */
1894         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1895                 fid = p9_client_walk(dfid, 1, &name, 1);
1896                 if (IS_ERR(fid)) {
1897                         err = PTR_ERR(fid);
1898                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1899                                 err);
1900                         fid = NULL;
1901                         goto error;
1902                 }
1903
1904                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1905                 if (IS_ERR(inode)) {
1906                         err = PTR_ERR(inode);
1907                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1908                                 err);
1909                         goto error;
1910                 }
1911                 dentry->d_op = &v9fs_cached_dentry_operations;
1912                 d_instantiate(dentry, inode);
1913                 err = v9fs_fid_add(dentry, fid);
1914                 if (err < 0)
1915                         goto error;
1916                 fid = NULL;
1917         } else {
1918                 /*
1919                  * Not in cached mode. No need to populate inode with stat.
1920                  * socket syscall returns a fd, so we need instantiate
1921                  */
1922                 inode = v9fs_get_inode(dir->i_sb, mode);
1923                 if (IS_ERR(inode)) {
1924                         err = PTR_ERR(inode);
1925                         goto error;
1926                 }
1927                 dentry->d_op = &v9fs_dentry_operations;
1928                 d_instantiate(dentry, inode);
1929         }
1930
1931 error:
1932         if (fid)
1933                 p9_client_clunk(fid);
1934         return err;
1935 }
1936
1937 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1938         .create = v9fs_vfs_create,
1939         .lookup = v9fs_vfs_lookup,
1940         .symlink = v9fs_vfs_symlink,
1941         .link = v9fs_vfs_link,
1942         .unlink = v9fs_vfs_unlink,
1943         .mkdir = v9fs_vfs_mkdir,
1944         .rmdir = v9fs_vfs_rmdir,
1945         .mknod = v9fs_vfs_mknod_dotl,
1946         .rename = v9fs_vfs_rename,
1947         .getattr = v9fs_vfs_getattr,
1948         .setattr = v9fs_vfs_setattr,
1949 };
1950
1951 static const struct inode_operations v9fs_dir_inode_operations_dotl = {
1952         .create = v9fs_vfs_create_dotl,
1953         .lookup = v9fs_vfs_lookup,
1954         .link = v9fs_vfs_link_dotl,
1955         .symlink = v9fs_vfs_symlink_dotl,
1956         .unlink = v9fs_vfs_unlink,
1957         .mkdir = v9fs_vfs_mkdir_dotl,
1958         .rmdir = v9fs_vfs_rmdir,
1959         .mknod = v9fs_vfs_mknod_dotl,
1960         .rename = v9fs_vfs_rename,
1961         .getattr = v9fs_vfs_getattr_dotl,
1962         .setattr = v9fs_vfs_setattr_dotl,
1963         .setxattr = generic_setxattr,
1964         .getxattr = generic_getxattr,
1965         .removexattr = generic_removexattr,
1966         .listxattr = v9fs_listxattr,
1967
1968 };
1969
1970 static const struct inode_operations v9fs_dir_inode_operations = {
1971         .create = v9fs_vfs_create,
1972         .lookup = v9fs_vfs_lookup,
1973         .unlink = v9fs_vfs_unlink,
1974         .mkdir = v9fs_vfs_mkdir,
1975         .rmdir = v9fs_vfs_rmdir,
1976         .mknod = v9fs_vfs_mknod,
1977         .rename = v9fs_vfs_rename,
1978         .getattr = v9fs_vfs_getattr,
1979         .setattr = v9fs_vfs_setattr,
1980 };
1981
1982 static const struct inode_operations v9fs_file_inode_operations = {
1983         .getattr = v9fs_vfs_getattr,
1984         .setattr = v9fs_vfs_setattr,
1985 };
1986
1987 static const struct inode_operations v9fs_file_inode_operations_dotl = {
1988         .getattr = v9fs_vfs_getattr_dotl,
1989         .setattr = v9fs_vfs_setattr_dotl,
1990         .setxattr = generic_setxattr,
1991         .getxattr = generic_getxattr,
1992         .removexattr = generic_removexattr,
1993         .listxattr = v9fs_listxattr,
1994 };
1995
1996 static const struct inode_operations v9fs_symlink_inode_operations = {
1997         .readlink = generic_readlink,
1998         .follow_link = v9fs_vfs_follow_link,
1999         .put_link = v9fs_vfs_put_link,
2000         .getattr = v9fs_vfs_getattr,
2001         .setattr = v9fs_vfs_setattr,
2002 };
2003
2004 static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
2005         .readlink = generic_readlink,
2006         .follow_link = v9fs_vfs_follow_link,
2007         .put_link = v9fs_vfs_put_link,
2008         .getattr = v9fs_vfs_getattr_dotl,
2009         .setattr = v9fs_vfs_setattr_dotl,
2010         .setxattr = generic_setxattr,
2011         .getxattr = generic_getxattr,
2012         .removexattr = generic_removexattr,
2013         .listxattr = v9fs_listxattr,
2014 };