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         if (v9ses->cache)
 734                 dentry->d_op = &v9fs_cached_dentry_operations;
 735         else
 736                 dentry->d_op = &v9fs_dentry_operations;
 737         d_instantiate(dentry, inode);
 738         err = v9fs_fid_add(dentry, fid);
 739         if (err < 0)
 740                 goto error;
 741
 742         /* if we are opening a file, assign the open fid to the file */
 743         if (nd && nd->flags & LOOKUP_OPEN) {
 744                 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
 745                 if (IS_ERR(filp)) {
 746                         p9_client_clunk(ofid);
 747                         return PTR_ERR(filp);
 748                 }
 749                 filp->private_data = ofid;
 750         } else
 751                 p9_client_clunk(ofid);
 752
 753         return 0;
 754
 755 error:
 756         if (ofid)
 757                 p9_client_clunk(ofid);
 758         if (fid)
 759                 p9_client_clunk(fid);
 760         return err;
 761 }
 762
 763 /**
 764  * v9fs_vfs_create - VFS hook to create files
 765  * @dir: directory inode that is being created
 766  * @dentry:  dentry that is being deleted
 767  * @mode: create permissions
 768  * @nd: path information
 769  *
 770  */
 771
 772 static int
 773 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
 774                 struct nameidata *nd)
 775 {
 776         int err;
 777         u32 perm;
 778         int flags;
 779         struct v9fs_session_info *v9ses;
 780         struct p9_fid *fid;
 781         struct file *filp;
 782
 783         err = 0;
 784         fid = NULL;
 785         v9ses = v9fs_inode2v9ses(dir);
 786         perm = unixmode2p9mode(v9ses, mode);
 787         if (nd && nd->flags & LOOKUP_OPEN)
 788                 flags = nd->intent.open.flags - 1;
 789         else
 790                 flags = O_RDWR;
 791
 792         fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
 793                                 v9fs_uflags2omode(flags,
 794                                                 v9fs_proto_dotu(v9ses)));
 795         if (IS_ERR(fid)) {
 796                 err = PTR_ERR(fid);
 797                 fid = NULL;
 798                 goto error;
 799         }
 800
 801         /* if we are opening a file, assign the open fid to the file */
 802         if (nd && nd->flags & LOOKUP_OPEN) {
 803                 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
 804                 if (IS_ERR(filp)) {
 805                         err = PTR_ERR(filp);
 806                         goto error;
 807                 }
 808
 809                 filp->private_data = fid;
 810         } else
 811                 p9_client_clunk(fid);
 812
 813         return 0;
 814
 815 error:
 816         if (fid)
 817                 p9_client_clunk(fid);
 818
 819         return err;
 820 }
 821
 822 /**
 823  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
 824  * @dir:  inode that is being unlinked
 825  * @dentry: dentry that is being unlinked
 826  * @mode: mode for new directory
 827  *
 828  */
 829
 830 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 831 {
 832         int err;
 833         u32 perm;
 834         struct v9fs_session_info *v9ses;
 835         struct p9_fid *fid;
 836
 837         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 838         err = 0;
 839         v9ses = v9fs_inode2v9ses(dir);
 840         perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
 841         fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
 842         if (IS_ERR(fid)) {
 843                 err = PTR_ERR(fid);
 844                 fid = NULL;
 845         }
 846
 847         if (fid)
 848                 p9_client_clunk(fid);
 849
 850         return err;
 851 }
 852
 853
 854 /**
 855  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 856  * @dir:  inode that is being unlinked
 857  * @dentry: dentry that is being unlinked
 858  * @mode: mode for new directory
 859  *
 860  */
 861
 862 static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry,
 863                                         int mode)
 864 {
 865         int err;
 866         struct v9fs_session_info *v9ses;
 867         struct p9_fid *fid = NULL, *dfid = NULL;
 868         gid_t gid;
 869         char *name;
 870         struct inode *inode;
 871         struct p9_qid qid;
 872         struct dentry *dir_dentry;
 873
 874         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 875         err = 0;
 876         v9ses = v9fs_inode2v9ses(dir);
 877
 878         mode |= S_IFDIR;
 879         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 880         dfid = v9fs_fid_lookup(dir_dentry);
 881         if (IS_ERR(dfid)) {
 882                 err = PTR_ERR(dfid);
 883                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 884                 dfid = NULL;
 885                 goto error;
 886         }
 887
 888         gid = v9fs_get_fsgid_for_create(dir);
 889
 890         name = (char *) dentry->d_name.name;
 891         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 892         if (err < 0)
 893                 goto error;
 894
 895         /* instantiate inode and assign the unopened fid to the dentry */
 896         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 897                 fid = p9_client_walk(dfid, 1, &name, 1);
 898                 if (IS_ERR(fid)) {
 899                         err = PTR_ERR(fid);
 900                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 901                                 err);
 902                         fid = NULL;
 903                         goto error;
 904                 }
 905
 906                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 907                 if (IS_ERR(inode)) {
 908                         err = PTR_ERR(inode);
 909                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 910                                 err);
 911                         goto error;
 912                 }
 913                 dentry->d_op = &v9fs_cached_dentry_operations;
 914                 d_instantiate(dentry, inode);
 915                 err = v9fs_fid_add(dentry, fid);
 916                 if (err < 0)
 917                         goto error;
 918                 fid = NULL;
 919         }
 920 error:
 921         if (fid)
 922                 p9_client_clunk(fid);
 923         return err;
 924 }
 925
 926 /**
 927  * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
 928  * @dir:  inode that is being walked from
 929  * @dentry: dentry that is being walked to?
 930  * @nameidata: path data
 931  *
 932  */
 933
 934 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 935                                       struct nameidata *nameidata)
 936 {
 937         struct super_block *sb;
 938         struct v9fs_session_info *v9ses;
 939         struct p9_fid *dfid, *fid;
 940         struct inode *inode;
 941         char *name;
 942         int result = 0;
 943
 944         P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
 945                 dir, dentry->d_name.name, dentry, nameidata);
 946
 947         if (dentry->d_name.len > NAME_MAX)
 948                 return ERR_PTR(-ENAMETOOLONG);
 949
 950         sb = dir->i_sb;
 951         v9ses = v9fs_inode2v9ses(dir);
 952         /* We can walk d_parent because we hold the dir->i_mutex */
 953         dfid = v9fs_fid_lookup(dentry->d_parent);
 954         if (IS_ERR(dfid))
 955                 return ERR_CAST(dfid);
 956
 957         name = (char *) dentry->d_name.name;
 958         fid = p9_client_walk(dfid, 1, &name, 1);
 959         if (IS_ERR(fid)) {
 960                 result = PTR_ERR(fid);
 961                 if (result == -ENOENT) {
 962                         inode = NULL;
 963                         goto inst_out;
 964                 }
 965
 966                 return ERR_PTR(result);
 967         }
 968
 969         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 970         if (IS_ERR(inode)) {
 971                 result = PTR_ERR(inode);
 972                 inode = NULL;
 973                 goto error;
 974         }
 975
 976         result = v9fs_fid_add(dentry, fid);
 977         if (result < 0)
 978                 goto error;
 979
 980 inst_out:
 981         if (v9ses->cache)
 982                 dentry->d_op = &v9fs_cached_dentry_operations;
 983         else
 984                 dentry->d_op = &v9fs_dentry_operations;
 985
 986         d_add(dentry, inode);
 987         return NULL;
 988
 989 error:
 990         p9_client_clunk(fid);
 991
 992         return ERR_PTR(result);
 993 }
 994
 995 /**
 996  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
 997  * @i:  inode that is being unlinked
 998  * @d: dentry that is being unlinked
 999  *
1000  */
1001
1002 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
1003 {
1004         return v9fs_remove(i, d, 0);
1005 }
1006
1007 /**
1008  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
1009  * @i:  inode that is being unlinked
1010  * @d: dentry that is being unlinked
1011  *
1012  */
1013
1014 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
1015 {
1016         return v9fs_remove(i, d, 1);
1017 }
1018
1019 /**
1020  * v9fs_vfs_rename - VFS hook to rename an inode
1021  * @old_dir:  old dir inode
1022  * @old_dentry: old dentry
1023  * @new_dir: new dir inode
1024  * @new_dentry: new dentry
1025  *
1026  */
1027
1028 static int
1029 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1030                 struct inode *new_dir, struct dentry *new_dentry)
1031 {
1032         struct inode *old_inode;
1033         struct v9fs_session_info *v9ses;
1034         struct p9_fid *oldfid;
1035         struct p9_fid *olddirfid;
1036         struct p9_fid *newdirfid;
1037         struct p9_wstat wstat;
1038         int retval;
1039
1040         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1041         retval = 0;
1042         old_inode = old_dentry->d_inode;
1043         v9ses = v9fs_inode2v9ses(old_inode);
1044         oldfid = v9fs_fid_lookup(old_dentry);
1045         if (IS_ERR(oldfid))
1046                 return PTR_ERR(oldfid);
1047
1048         olddirfid = v9fs_fid_clone(old_dentry->d_parent);
1049         if (IS_ERR(olddirfid)) {
1050                 retval = PTR_ERR(olddirfid);
1051                 goto done;
1052         }
1053
1054         newdirfid = v9fs_fid_clone(new_dentry->d_parent);
1055         if (IS_ERR(newdirfid)) {
1056                 retval = PTR_ERR(newdirfid);
1057                 goto clunk_olddir;
1058         }
1059
1060         down_write(&v9ses->rename_sem);
1061         if (v9fs_proto_dotl(v9ses)) {
1062                 retval = p9_client_rename(oldfid, newdirfid,
1063                                         (char *) new_dentry->d_name.name);
1064                 if (retval != -ENOSYS)
1065                         goto clunk_newdir;
1066         }
1067         if (old_dentry->d_parent != new_dentry->d_parent) {
1068                 /*
1069                  * 9P .u can only handle file rename in the same directory
1070                  */
1071
1072                 P9_DPRINTK(P9_DEBUG_ERROR,
1073                                 "old dir and new dir are different\n");
1074                 retval = -EXDEV;
1075                 goto clunk_newdir;
1076         }
1077         v9fs_blank_wstat(&wstat);
1078         wstat.muid = v9ses->uname;
1079         wstat.name = (char *) new_dentry->d_name.name;
1080         retval = p9_client_wstat(oldfid, &wstat);
1081
1082 clunk_newdir:
1083         if (!retval)
1084                 /* successful rename */
1085                 d_move(old_dentry, new_dentry);
1086         up_write(&v9ses->rename_sem);
1087         p9_client_clunk(newdirfid);
1088
1089 clunk_olddir:
1090         p9_client_clunk(olddirfid);
1091
1092 done:
1093         return retval;
1094 }
1095
1096 /**
1097  * v9fs_vfs_getattr - retrieve file metadata
1098  * @mnt: mount information
1099  * @dentry: file to get attributes on
1100  * @stat: metadata structure to populate
1101  *
1102  */
1103
1104 static int
1105 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1106                  struct kstat *stat)
1107 {
1108         int err;
1109         struct v9fs_session_info *v9ses;
1110         struct p9_fid *fid;
1111         struct p9_wstat *st;
1112
1113         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1114         err = -EPERM;
1115         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1116         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1117                 return simple_getattr(mnt, dentry, stat);
1118
1119         fid = v9fs_fid_lookup(dentry);
1120         if (IS_ERR(fid))
1121                 return PTR_ERR(fid);
1122
1123         st = p9_client_stat(fid);
1124         if (IS_ERR(st))
1125                 return PTR_ERR(st);
1126
1127         v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1128                 generic_fillattr(dentry->d_inode, stat);
1129
1130         p9stat_free(st);
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         p9stat_free(st);
1493         kfree(st);
1494         return retval;
1495 }
1496
1497 /**
1498  * v9fs_vfs_follow_link - follow a symlink path
1499  * @dentry: dentry for symlink
1500  * @nd: nameidata
1501  *
1502  */
1503
1504 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1505 {
1506         int len = 0;
1507         char *link = __getname();
1508
1509         P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1510
1511         if (!link)
1512                 link = ERR_PTR(-ENOMEM);
1513         else {
1514                 len = v9fs_readlink(dentry, link, PATH_MAX);
1515
1516                 if (len < 0) {
1517                         __putname(link);
1518                         link = ERR_PTR(len);
1519                 } else
1520                         link[min(len, PATH_MAX-1)] = 0;
1521         }
1522         nd_set_link(nd, link);
1523
1524         return NULL;
1525 }
1526
1527 /**
1528  * v9fs_vfs_put_link - release a symlink path
1529  * @dentry: dentry for symlink
1530  * @nd: nameidata
1531  * @p: unused
1532  *
1533  */
1534
1535 static void
1536 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1537 {
1538         char *s = nd_get_link(nd);
1539
1540         P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1541                 IS_ERR(s) ? "<error>" : s);
1542         if (!IS_ERR(s))
1543                 __putname(s);
1544 }
1545
1546 /**
1547  * v9fs_vfs_mkspecial - create a special file
1548  * @dir: inode to create special file in
1549  * @dentry: dentry to create
1550  * @mode: mode to create special file
1551  * @extension: 9p2000.u format extension string representing special file
1552  *
1553  */
1554
1555 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1556         int mode, const char *extension)
1557 {
1558         u32 perm;
1559         struct v9fs_session_info *v9ses;
1560         struct p9_fid *fid;
1561
1562         v9ses = v9fs_inode2v9ses(dir);
1563         if (!v9fs_proto_dotu(v9ses)) {
1564                 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1565                 return -EPERM;
1566         }
1567
1568         perm = unixmode2p9mode(v9ses, mode);
1569         fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1570                                                                 P9_OREAD);
1571         if (IS_ERR(fid))
1572                 return PTR_ERR(fid);
1573
1574         p9_client_clunk(fid);
1575         return 0;
1576 }
1577
1578 /**
1579  * v9fs_vfs_symlink_dotl - helper function to create symlinks
1580  * @dir: directory inode containing symlink
1581  * @dentry: dentry for symlink
1582  * @symname: symlink data
1583  *
1584  * See Also: 9P2000.L RFC for more information
1585  *
1586  */
1587
1588 static int
1589 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
1590                 const char *symname)
1591 {
1592         struct v9fs_session_info *v9ses;
1593         struct p9_fid *dfid;
1594         struct p9_fid *fid = NULL;
1595         struct inode *inode;
1596         struct p9_qid qid;
1597         char *name;
1598         int err;
1599         gid_t gid;
1600
1601         name = (char *) dentry->d_name.name;
1602         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
1603                         dir->i_ino, name, symname);
1604         v9ses = v9fs_inode2v9ses(dir);
1605
1606         dfid = v9fs_fid_lookup(dentry->d_parent);
1607         if (IS_ERR(dfid)) {
1608                 err = PTR_ERR(dfid);
1609                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1610                 return err;
1611         }
1612
1613         gid = v9fs_get_fsgid_for_create(dir);
1614
1615         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
1616         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
1617
1618         if (err < 0) {
1619                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
1620                 goto error;
1621         }
1622
1623         if (v9ses->cache) {
1624                 /* Now walk from the parent so we can get an unopened fid. */
1625                 fid = p9_client_walk(dfid, 1, &name, 1);
1626                 if (IS_ERR(fid)) {
1627                         err = PTR_ERR(fid);
1628                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1629                                         err);
1630                         fid = NULL;
1631                         goto error;
1632                 }
1633
1634                 /* instantiate inode and assign the unopened fid to dentry */
1635                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1636                 if (IS_ERR(inode)) {
1637                         err = PTR_ERR(inode);
1638                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1639                                         err);
1640                         goto error;
1641                 }
1642                 dentry->d_op = &v9fs_cached_dentry_operations;
1643                 d_instantiate(dentry, inode);
1644                 err = v9fs_fid_add(dentry, fid);
1645                 if (err < 0)
1646                         goto error;
1647                 fid = NULL;
1648         } else {
1649                 /* Not in cached mode. No need to populate inode with stat */
1650                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
1651                 if (IS_ERR(inode)) {
1652                         err = PTR_ERR(inode);
1653                         goto error;
1654                 }
1655                 dentry->d_op = &v9fs_dentry_operations;
1656                 d_instantiate(dentry, inode);
1657         }
1658
1659 error:
1660         if (fid)
1661                 p9_client_clunk(fid);
1662
1663         return err;
1664 }
1665
1666 /**
1667  * v9fs_vfs_symlink - helper function to create symlinks
1668  * @dir: directory inode containing symlink
1669  * @dentry: dentry for symlink
1670  * @symname: symlink data
1671  *
1672  * See Also: 9P2000.u RFC for more information
1673  *
1674  */
1675
1676 static int
1677 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1678 {
1679         P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1680                                         dentry->d_name.name, symname);
1681
1682         return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1683 }
1684
1685 /**
1686  * v9fs_vfs_link - create a hardlink
1687  * @old_dentry: dentry for file to link to
1688  * @dir: inode destination for new link
1689  * @dentry: dentry for link
1690  *
1691  */
1692
1693 static int
1694 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1695               struct dentry *dentry)
1696 {
1697         int retval;
1698         struct p9_fid *oldfid;
1699         char *name;
1700
1701         P9_DPRINTK(P9_DEBUG_VFS,
1702                 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1703                 old_dentry->d_name.name);
1704
1705         oldfid = v9fs_fid_clone(old_dentry);
1706         if (IS_ERR(oldfid))
1707                 return PTR_ERR(oldfid);
1708
1709         name = __getname();
1710         if (unlikely(!name)) {
1711                 retval = -ENOMEM;
1712                 goto clunk_fid;
1713         }
1714
1715         sprintf(name, "%d\n", oldfid->fid);
1716         retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1717         __putname(name);
1718
1719 clunk_fid:
1720         p9_client_clunk(oldfid);
1721         return retval;
1722 }
1723
1724 /**
1725  * v9fs_vfs_link_dotl - create a hardlink for dotl
1726  * @old_dentry: dentry for file to link to
1727  * @dir: inode destination for new link
1728  * @dentry: dentry for link
1729  *
1730  */
1731
1732 static int
1733 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
1734                 struct dentry *dentry)
1735 {
1736         int err;
1737         struct p9_fid *dfid, *oldfid;
1738         char *name;
1739         struct v9fs_session_info *v9ses;
1740         struct dentry *dir_dentry;
1741
1742         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
1743                         dir->i_ino, old_dentry->d_name.name,
1744                         dentry->d_name.name);
1745
1746         v9ses = v9fs_inode2v9ses(dir);
1747         dir_dentry = v9fs_dentry_from_dir_inode(dir);
1748         dfid = v9fs_fid_lookup(dir_dentry);
1749         if (IS_ERR(dfid))
1750                 return PTR_ERR(dfid);
1751
1752         oldfid = v9fs_fid_lookup(old_dentry);
1753         if (IS_ERR(oldfid))
1754                 return PTR_ERR(oldfid);
1755
1756         name = (char *) dentry->d_name.name;
1757
1758         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
1759
1760         if (err < 0) {
1761                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
1762                 return err;
1763         }
1764
1765         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1766                 /* Get the latest stat info from server. */
1767                 struct p9_fid *fid;
1768                 struct p9_stat_dotl *st;
1769
1770                 fid = v9fs_fid_lookup(old_dentry);
1771                 if (IS_ERR(fid))
1772                         return PTR_ERR(fid);
1773
1774                 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
1775                 if (IS_ERR(st))
1776                         return PTR_ERR(st);
1777
1778                 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
1779
1780                 kfree(st);
1781         } else {
1782                 /* Caching disabled. No need to get upto date stat info.
1783                  * This dentry will be released immediately. So, just hold the
1784                  * inode
1785                  */
1786                 ihold(old_dentry->d_inode);
1787         }
1788
1789         dentry->d_op = old_dentry->d_op;
1790         d_instantiate(dentry, old_dentry->d_inode);
1791
1792         return err;
1793 }
1794
1795 /**
1796  * v9fs_vfs_mknod - create a special file
1797  * @dir: inode destination for new link
1798  * @dentry: dentry for file
1799  * @mode: mode for creation
1800  * @rdev: device associated with special file
1801  *
1802  */
1803
1804 static int
1805 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1806 {
1807         int retval;
1808         char *name;
1809
1810         P9_DPRINTK(P9_DEBUG_VFS,
1811                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1812                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1813
1814         if (!new_valid_dev(rdev))
1815                 return -EINVAL;
1816
1817         name = __getname();
1818         if (!name)
1819                 return -ENOMEM;
1820         /* build extension */
1821         if (S_ISBLK(mode))
1822                 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1823         else if (S_ISCHR(mode))
1824                 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1825         else if (S_ISFIFO(mode))
1826                 *name = 0;
1827         else if (S_ISSOCK(mode))
1828                 *name = 0;
1829         else {
1830                 __putname(name);
1831                 return -EINVAL;
1832         }
1833
1834         retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1835         __putname(name);
1836
1837         return retval;
1838 }
1839
1840 /**
1841  * v9fs_vfs_mknod_dotl - create a special file
1842  * @dir: inode destination for new link
1843  * @dentry: dentry for file
1844  * @mode: mode for creation
1845  * @rdev: device associated with special file
1846  *
1847  */
1848 static int
1849 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
1850                 dev_t rdev)
1851 {
1852         int err;
1853         char *name;
1854         struct v9fs_session_info *v9ses;
1855         struct p9_fid *fid = NULL, *dfid = NULL;
1856         struct inode *inode;
1857         gid_t gid;
1858         struct p9_qid qid;
1859         struct dentry *dir_dentry;
1860
1861         P9_DPRINTK(P9_DEBUG_VFS,
1862                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1863                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1864
1865         if (!new_valid_dev(rdev))
1866                 return -EINVAL;
1867
1868         v9ses = v9fs_inode2v9ses(dir);
1869         dir_dentry = v9fs_dentry_from_dir_inode(dir);
1870         dfid = v9fs_fid_lookup(dir_dentry);
1871         if (IS_ERR(dfid)) {
1872                 err = PTR_ERR(dfid);
1873                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1874                 dfid = NULL;
1875                 goto error;
1876         }
1877
1878         gid = v9fs_get_fsgid_for_create(dir);
1879
1880         name = (char *) dentry->d_name.name;
1881
1882         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
1883         if (err < 0)
1884                 goto error;
1885
1886         /* instantiate inode and assign the unopened fid to the dentry */
1887         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1888                 fid = p9_client_walk(dfid, 1, &name, 1);
1889                 if (IS_ERR(fid)) {
1890                         err = PTR_ERR(fid);
1891                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1892                                 err);
1893                         fid = NULL;
1894                         goto error;
1895                 }
1896
1897                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1898                 if (IS_ERR(inode)) {
1899                         err = PTR_ERR(inode);
1900                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1901                                 err);
1902                         goto error;
1903                 }
1904                 dentry->d_op = &v9fs_cached_dentry_operations;
1905                 d_instantiate(dentry, inode);
1906                 err = v9fs_fid_add(dentry, fid);
1907                 if (err < 0)
1908                         goto error;
1909                 fid = NULL;
1910         } else {
1911                 /*
1912                  * Not in cached mode. No need to populate inode with stat.
1913                  * socket syscall returns a fd, so we need instantiate
1914                  */
1915                 inode = v9fs_get_inode(dir->i_sb, mode);
1916                 if (IS_ERR(inode)) {
1917                         err = PTR_ERR(inode);
1918                         goto error;
1919                 }
1920                 dentry->d_op = &v9fs_dentry_operations;
1921                 d_instantiate(dentry, inode);
1922         }
1923
1924 error:
1925         if (fid)
1926                 p9_client_clunk(fid);
1927         return err;
1928 }
1929
1930 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1931         .create = v9fs_vfs_create,
1932         .lookup = v9fs_vfs_lookup,
1933         .symlink = v9fs_vfs_symlink,
1934         .link = v9fs_vfs_link,
1935         .unlink = v9fs_vfs_unlink,
1936         .mkdir = v9fs_vfs_mkdir,
1937         .rmdir = v9fs_vfs_rmdir,
1938         .mknod = v9fs_vfs_mknod,
1939         .rename = v9fs_vfs_rename,
1940         .getattr = v9fs_vfs_getattr,
1941         .setattr = v9fs_vfs_setattr,
1942 };
1943
1944 static const struct inode_operations v9fs_dir_inode_operations_dotl = {
1945         .create = v9fs_vfs_create_dotl,
1946         .lookup = v9fs_vfs_lookup,
1947         .link = v9fs_vfs_link_dotl,
1948         .symlink = v9fs_vfs_symlink_dotl,
1949         .unlink = v9fs_vfs_unlink,
1950         .mkdir = v9fs_vfs_mkdir_dotl,
1951         .rmdir = v9fs_vfs_rmdir,
1952         .mknod = v9fs_vfs_mknod_dotl,
1953         .rename = v9fs_vfs_rename,
1954         .getattr = v9fs_vfs_getattr_dotl,
1955         .setattr = v9fs_vfs_setattr_dotl,
1956         .setxattr = generic_setxattr,
1957         .getxattr = generic_getxattr,
1958         .removexattr = generic_removexattr,
1959         .listxattr = v9fs_listxattr,
1960
1961 };
1962
1963 static const struct inode_operations v9fs_dir_inode_operations = {
1964         .create = v9fs_vfs_create,
1965         .lookup = v9fs_vfs_lookup,
1966         .unlink = v9fs_vfs_unlink,
1967         .mkdir = v9fs_vfs_mkdir,
1968         .rmdir = v9fs_vfs_rmdir,
1969         .mknod = v9fs_vfs_mknod,
1970         .rename = v9fs_vfs_rename,
1971         .getattr = v9fs_vfs_getattr,
1972         .setattr = v9fs_vfs_setattr,
1973 };
1974
1975 static const struct inode_operations v9fs_file_inode_operations = {
1976         .getattr = v9fs_vfs_getattr,
1977         .setattr = v9fs_vfs_setattr,
1978 };
1979
1980 static const struct inode_operations v9fs_file_inode_operations_dotl = {
1981         .getattr = v9fs_vfs_getattr_dotl,
1982         .setattr = v9fs_vfs_setattr_dotl,
1983         .setxattr = generic_setxattr,
1984         .getxattr = generic_getxattr,
1985         .removexattr = generic_removexattr,
1986         .listxattr = v9fs_listxattr,
1987 };
1988
1989 static const struct inode_operations v9fs_symlink_inode_operations = {
1990         .readlink = generic_readlink,
1991         .follow_link = v9fs_vfs_follow_link,
1992         .put_link = v9fs_vfs_put_link,
1993         .getattr = v9fs_vfs_getattr,
1994         .setattr = v9fs_vfs_setattr,
1995 };
1996
1997 static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1998         .readlink = generic_readlink,
1999         .follow_link = v9fs_vfs_follow_link,
2000         .put_link = v9fs_vfs_put_link,
2001         .getattr = v9fs_vfs_getattr_dotl,
2002         .setattr = v9fs_vfs_setattr_dotl,
2003         .setxattr = generic_setxattr,
2004         .getxattr = generic_getxattr,
2005         .removexattr = generic_removexattr,
2006         .listxattr = v9fs_listxattr,
2007 };