fs/9p/vfs_inode.c

   1 /*
   2  *  linux/fs/9p/vfs_inode.c
   3  *
   4  * This file contains vfs inode ops for the 9P2000 protocol.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/file.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/stat.h>
  32 #include <linux/string.h>
  33 #include <linux/inet.h>
  34 #include <linux/namei.h>
  35 #include <linux/idr.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/xattr.h>
  39 #include <linux/posix_acl.h>
  40 #include <net/9p/9p.h>
  41 #include <net/9p/client.h>
  42
  43 #include "v9fs.h"
  44 #include "v9fs_vfs.h"
  45 #include "fid.h"
  46 #include "cache.h"
  47 #include "xattr.h"
  48 #include "acl.h"
  49
  50 static const struct inode_operations v9fs_dir_inode_operations;
  51 static const struct inode_operations v9fs_dir_inode_operations_dotu;
  52 static const struct inode_operations v9fs_dir_inode_operations_dotl;
  53 static const struct inode_operations v9fs_file_inode_operations;
  54 static const struct inode_operations v9fs_file_inode_operations_dotl;
  55 static const struct inode_operations v9fs_symlink_inode_operations;
  56 static const struct inode_operations v9fs_symlink_inode_operations_dotl;
  57
  58 static int
  59 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
  60                     dev_t rdev);
  61
  62 /**
  63  * unixmode2p9mode - convert unix mode bits to plan 9
  64  * @v9ses: v9fs session information
  65  * @mode: mode to convert
  66  *
  67  */
  68
  69 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
  70 {
  71         int res;
  72         res = mode & 0777;
  73         if (S_ISDIR(mode))
  74                 res |= P9_DMDIR;
  75         if (v9fs_proto_dotu(v9ses)) {
  76                 if (S_ISLNK(mode))
  77                         res |= P9_DMSYMLINK;
  78                 if (v9ses->nodev == 0) {
  79                         if (S_ISSOCK(mode))
  80                                 res |= P9_DMSOCKET;
  81                         if (S_ISFIFO(mode))
  82                                 res |= P9_DMNAMEDPIPE;
  83                         if (S_ISBLK(mode))
  84                                 res |= P9_DMDEVICE;
  85                         if (S_ISCHR(mode))
  86                                 res |= P9_DMDEVICE;
  87                 }
  88
  89                 if ((mode & S_ISUID) == S_ISUID)
  90                         res |= P9_DMSETUID;
  91                 if ((mode & S_ISGID) == S_ISGID)
  92                         res |= P9_DMSETGID;
  93                 if ((mode & S_ISVTX) == S_ISVTX)
  94                         res |= P9_DMSETVTX;
  95                 if ((mode & P9_DMLINK))
  96                         res |= P9_DMLINK;
  97         }
  98
  99         return res;
 100 }
 101
 102 /**
 103  * p9mode2unixmode- convert plan9 mode bits to unix mode bits
 104  * @v9ses: v9fs session information
 105  * @mode: mode to convert
 106  *
 107  */
 108
 109 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
 110 {
 111         int res;
 112
 113         res = mode & 0777;
 114
 115         if ((mode & P9_DMDIR) == P9_DMDIR)
 116                 res |= S_IFDIR;
 117         else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
 118                 res |= S_IFLNK;
 119         else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
 120                  && (v9ses->nodev == 0))
 121                 res |= S_IFSOCK;
 122         else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
 123                  && (v9ses->nodev == 0))
 124                 res |= S_IFIFO;
 125         else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
 126                  && (v9ses->nodev == 0))
 127                 res |= S_IFBLK;
 128         else
 129                 res |= S_IFREG;
 130
 131         if (v9fs_proto_dotu(v9ses)) {
 132                 if ((mode & P9_DMSETUID) == P9_DMSETUID)
 133                         res |= S_ISUID;
 134
 135                 if ((mode & P9_DMSETGID) == P9_DMSETGID)
 136                         res |= S_ISGID;
 137
 138                 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
 139                         res |= S_ISVTX;
 140         }
 141
 142         return res;
 143 }
 144
 145 /**
 146  * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
 147  * @uflags: flags to convert
 148  * @extended: if .u extensions are active
 149  */
 150
 151 int v9fs_uflags2omode(int uflags, int extended)
 152 {
 153         int ret;
 154
 155         ret = 0;
 156         switch (uflags&3) {
 157         default:
 158         case O_RDONLY:
 159                 ret = P9_OREAD;
 160                 break;
 161
 162         case O_WRONLY:
 163                 ret = P9_OWRITE;
 164                 break;
 165
 166         case O_RDWR:
 167                 ret = P9_ORDWR;
 168                 break;
 169         }
 170
 171         if (uflags & O_TRUNC)
 172                 ret |= P9_OTRUNC;
 173
 174         if (extended) {
 175                 if (uflags & O_EXCL)
 176                         ret |= P9_OEXCL;
 177
 178                 if (uflags & O_APPEND)
 179                         ret |= P9_OAPPEND;
 180         }
 181
 182         return ret;
 183 }
 184
 185 /**
 186  * v9fs_blank_wstat - helper function to setup a 9P stat structure
 187  * @wstat: structure to initialize
 188  *
 189  */
 190
 191 void
 192 v9fs_blank_wstat(struct p9_wstat *wstat)
 193 {
 194         wstat->type = ~0;
 195         wstat->dev = ~0;
 196         wstat->qid.type = ~0;
 197         wstat->qid.version = ~0;
 198         *((long long *)&wstat->qid.path) = ~0;
 199         wstat->mode = ~0;
 200         wstat->atime = ~0;
 201         wstat->mtime = ~0;
 202         wstat->length = ~0;
 203         wstat->name = NULL;
 204         wstat->uid = NULL;
 205         wstat->gid = NULL;
 206         wstat->muid = NULL;
 207         wstat->n_uid = ~0;
 208         wstat->n_gid = ~0;
 209         wstat->n_muid = ~0;
 210         wstat->extension = NULL;
 211 }
 212
 213 #ifdef CONFIG_9P_FSCACHE
 214 /**
 215  * v9fs_alloc_inode - helper function to allocate an inode
 216  * This callback is executed before setting up the inode so that we
 217  * can associate a vcookie with each inode.
 218  *
 219  */
 220
 221 struct inode *v9fs_alloc_inode(struct super_block *sb)
 222 {
 223         struct v9fs_cookie *vcookie;
 224         vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
 225                                                          GFP_KERNEL);
 226         if (!vcookie)
 227                 return NULL;
 228
 229         vcookie->fscache = NULL;
 230         vcookie->qid = NULL;
 231         spin_lock_init(&vcookie->lock);
 232         return &vcookie->inode;
 233 }
 234
 235 /**
 236  * v9fs_destroy_inode - destroy an inode
 237  *
 238  */
 239
 240 static void v9fs_i_callback(struct rcu_head *head)
 241 {
 242         struct inode *inode = container_of(head, struct inode, i_rcu);
 243         INIT_LIST_HEAD(&inode->i_dentry);
 244         kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
 245 }
 246
 247 void v9fs_destroy_inode(struct inode *inode)
 248 {
 249         call_rcu(&inode->i_rcu, v9fs_i_callback);
 250 }
 251 #endif
 252
 253 /**
 254  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
 255  * new file system object. This checks the S_ISGID to determine the owning
 256  * group of the new file system object.
 257  */
 258
 259 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
 260 {
 261         BUG_ON(dir_inode == NULL);
 262
 263         if (dir_inode->i_mode & S_ISGID) {
 264                 /* set_gid bit is set.*/
 265                 return dir_inode->i_gid;
 266         }
 267         return current_fsgid();
 268 }
 269
 270 /**
 271  * v9fs_dentry_from_dir_inode - helper function to get the dentry from
 272  * dir inode.
 273  *
 274  */
 275
 276 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
 277 {
 278         struct dentry *dentry;
 279
 280         spin_lock(&dcache_inode_lock);
 281         /* Directory should have only one entry. */
 282         BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
 283         dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
 284         spin_unlock(&dcache_inode_lock);
 285         return dentry;
 286 }
 287
 288 /**
 289  * v9fs_get_inode - helper function to setup an inode
 290  * @sb: superblock
 291  * @mode: mode to setup inode with
 292  *
 293  */
 294
 295 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 296 {
 297         int err;
 298         struct inode *inode;
 299         struct v9fs_session_info *v9ses = sb->s_fs_info;
 300
 301         P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
 302
 303         inode = new_inode(sb);
 304         if (!inode) {
 305                 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
 306                 return ERR_PTR(-ENOMEM);
 307         }
 308
 309         inode_init_owner(inode, NULL, mode);
 310         inode->i_blocks = 0;
 311         inode->i_rdev = 0;
 312         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 313         inode->i_mapping->a_ops = &v9fs_addr_operations;
 314
 315         switch (mode & S_IFMT) {
 316         case S_IFIFO:
 317         case S_IFBLK:
 318         case S_IFCHR:
 319         case S_IFSOCK:
 320                 if (v9fs_proto_dotl(v9ses)) {
 321                         inode->i_op = &v9fs_file_inode_operations_dotl;
 322                         inode->i_fop = &v9fs_file_operations_dotl;
 323                 } else if (v9fs_proto_dotu(v9ses)) {
 324                         inode->i_op = &v9fs_file_inode_operations;
 325                         inode->i_fop = &v9fs_file_operations;
 326                 } else {
 327                         P9_DPRINTK(P9_DEBUG_ERROR,
 328                                    "special files without extended mode\n");
 329                         err = -EINVAL;
 330                         goto error;
 331                 }
 332                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 333                 break;
 334         case S_IFREG:
 335                 if (v9fs_proto_dotl(v9ses)) {
 336                         inode->i_op = &v9fs_file_inode_operations_dotl;
 337                         inode->i_fop = &v9fs_file_operations_dotl;
 338                 } else {
 339                         inode->i_op = &v9fs_file_inode_operations;
 340                         inode->i_fop = &v9fs_file_operations;
 341                 }
 342
 343                 break;
 344
 345         case S_IFLNK:
 346                 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
 347                         P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
 348                                                 "legacy protocol.\n");
 349                         err = -EINVAL;
 350                         goto error;
 351                 }
 352
 353                 if (v9fs_proto_dotl(v9ses))
 354                         inode->i_op = &v9fs_symlink_inode_operations_dotl;
 355                 else
 356                         inode->i_op = &v9fs_symlink_inode_operations;
 357
 358                 break;
 359         case S_IFDIR:
 360                 inc_nlink(inode);
 361                 if (v9fs_proto_dotl(v9ses))
 362                         inode->i_op = &v9fs_dir_inode_operations_dotl;
 363                 else if (v9fs_proto_dotu(v9ses))
 364                         inode->i_op = &v9fs_dir_inode_operations_dotu;
 365                 else
 366                         inode->i_op = &v9fs_dir_inode_operations;
 367
 368                 if (v9fs_proto_dotl(v9ses))
 369                         inode->i_fop = &v9fs_dir_operations_dotl;
 370                 else
 371                         inode->i_fop = &v9fs_dir_operations;
 372
 373                 break;
 374         default:
 375                 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
 376                            mode, mode & S_IFMT);
 377                 err = -EINVAL;
 378                 goto error;
 379         }
 380
 381         return inode;
 382
 383 error:
 384         iput(inode);
 385         return ERR_PTR(err);
 386 }
 387
 388 /*
 389 static struct v9fs_fid*
 390 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
 391 {
 392         int err;
 393         int nfid;
 394         struct v9fs_fid *ret;
 395         struct v9fs_fcall *fcall;
 396
 397         nfid = v9fs_get_idpool(&v9ses->fidpool);
 398         if (nfid < 0) {
 399                 eprintk(KERN_WARNING, "no free fids available\n");
 400                 return ERR_PTR(-ENOSPC);
 401         }
 402
 403         err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
 404                 &fcall);
 405
 406         if (err < 0) {
 407                 if (fcall && fcall->id == RWALK)
 408                         goto clunk_fid;
 409
 410                 PRINT_FCALL_ERROR("walk error", fcall);
 411                 v9fs_put_idpool(nfid, &v9ses->fidpool);
 412                 goto error;
 413         }
 414
 415         kfree(fcall);
 416         fcall = NULL;
 417         ret = v9fs_fid_create(v9ses, nfid);
 418         if (!ret) {
 419                 err = -ENOMEM;
 420                 goto clunk_fid;
 421         }
 422
 423         err = v9fs_fid_insert(ret, dentry);
 424         if (err < 0) {
 425                 v9fs_fid_destroy(ret);
 426                 goto clunk_fid;
 427         }
 428
 429         return ret;
 430
 431 clunk_fid:
 432         v9fs_t_clunk(v9ses, nfid);
 433
 434 error:
 435         kfree(fcall);
 436         return ERR_PTR(err);
 437 }
 438 */
 439
 440
 441 /**
 442  * v9fs_clear_inode - release an inode
 443  * @inode: inode to release
 444  *
 445  */
 446 void v9fs_evict_inode(struct inode *inode)
 447 {
 448         truncate_inode_pages(inode->i_mapping, 0);
 449         end_writeback(inode);
 450         filemap_fdatawrite(inode->i_mapping);
 451
 452 #ifdef CONFIG_9P_FSCACHE
 453         v9fs_cache_inode_put_cookie(inode);
 454 #endif
 455 }
 456
 457 static struct inode *
 458 v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 459         struct super_block *sb)
 460 {
 461         int err, umode;
 462         struct inode *ret = NULL;
 463         struct p9_wstat *st;
 464
 465         st = p9_client_stat(fid);
 466         if (IS_ERR(st))
 467                 return ERR_CAST(st);
 468
 469         umode = p9mode2unixmode(v9ses, st->mode);
 470         ret = v9fs_get_inode(sb, umode);
 471         if (IS_ERR(ret)) {
 472                 err = PTR_ERR(ret);
 473                 goto error;
 474         }
 475
 476         v9fs_stat2inode(st, ret, sb);
 477         ret->i_ino = v9fs_qid2ino(&st->qid);
 478
 479 #ifdef CONFIG_9P_FSCACHE
 480         v9fs_vcookie_set_qid(ret, &st->qid);
 481         v9fs_cache_inode_get_cookie(ret);
 482 #endif
 483         p9stat_free(st);
 484         kfree(st);
 485         return ret;
 486 error:
 487         p9stat_free(st);
 488         kfree(st);
 489         return ERR_PTR(err);
 490 }
 491
 492 static struct inode *
 493 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 494         struct super_block *sb)
 495 {
 496         struct inode *ret = NULL;
 497         int err;
 498         struct p9_stat_dotl *st;
 499
 500         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
 501         if (IS_ERR(st))
 502                 return ERR_CAST(st);
 503
 504         ret = v9fs_get_inode(sb, st->st_mode);
 505         if (IS_ERR(ret)) {
 506                 err = PTR_ERR(ret);
 507                 goto error;
 508         }
 509
 510         v9fs_stat2inode_dotl(st, ret);
 511         ret->i_ino = v9fs_qid2ino(&st->qid);
 512 #ifdef CONFIG_9P_FSCACHE
 513         v9fs_vcookie_set_qid(ret, &st->qid);
 514         v9fs_cache_inode_get_cookie(ret);
 515 #endif
 516         err = v9fs_get_acl(ret, fid);
 517         if (err) {
 518                 iput(ret);
 519                 goto error;
 520         }
 521         kfree(st);
 522         return ret;
 523 error:
 524         kfree(st);
 525         return ERR_PTR(err);
 526 }
 527
 528 /**
 529  * v9fs_inode_from_fid - Helper routine to populate an inode by
 530  * issuing a attribute request
 531  * @v9ses: session information
 532  * @fid: fid to issue attribute request for
 533  * @sb: superblock on which to create inode
 534  *
 535  */
 536 static inline struct inode *
 537 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 538                         struct super_block *sb)
 539 {
 540         if (v9fs_proto_dotl(v9ses))
 541                 return v9fs_inode_dotl(v9ses, fid, sb);
 542         else
 543                 return v9fs_inode(v9ses, fid, sb);
 544 }
 545
 546 /**
 547  * v9fs_remove - helper function to remove files and directories
 548  * @dir: directory inode that is being deleted
 549  * @file:  dentry that is being deleted
 550  * @rmdir: removing a directory
 551  *
 552  */
 553
 554 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
 555 {
 556         int retval;
 557         struct inode *file_inode;
 558         struct p9_fid *v9fid;
 559
 560         P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
 561                 rmdir);
 562
 563         file_inode = file->d_inode;
 564         v9fid = v9fs_fid_clone(file);
 565         if (IS_ERR(v9fid))
 566                 return PTR_ERR(v9fid);
 567
 568         retval = p9_client_remove(v9fid);
 569         if (!retval)
 570                 drop_nlink(file_inode);
 571         return retval;
 572 }
 573
 574 /**
 575  * v9fs_create - Create a file
 576  * @v9ses: session information
 577  * @dir: directory that dentry is being created in
 578  * @dentry:  dentry that is being created
 579  * @extension: 9p2000.u extension string to support devices, etc.
 580  * @perm: create permissions
 581  * @mode: open mode
 582  *
 583  */
 584 static struct p9_fid *
 585 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 586                 struct dentry *dentry, char *extension, u32 perm, u8 mode)
 587 {
 588         int err;
 589         char *name;
 590         struct p9_fid *dfid, *ofid, *fid;
 591         struct inode *inode;
 592
 593         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 594
 595         err = 0;
 596         ofid = NULL;
 597         fid = NULL;
 598         name = (char *) dentry->d_name.name;
 599         dfid = v9fs_fid_lookup(dentry->d_parent);
 600         if (IS_ERR(dfid)) {
 601                 err = PTR_ERR(dfid);
 602                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 603                 return ERR_PTR(err);
 604         }
 605
 606         /* clone a fid to use for creation */
 607         ofid = p9_client_walk(dfid, 0, NULL, 1);
 608         if (IS_ERR(ofid)) {
 609                 err = PTR_ERR(ofid);
 610                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 611                 return ERR_PTR(err);
 612         }
 613
 614         err = p9_client_fcreate(ofid, name, perm, mode, extension);
 615         if (err < 0) {
 616                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
 617                 goto error;
 618         }
 619
 620         /* now walk from the parent so we can get unopened fid */
 621         fid = p9_client_walk(dfid, 1, &name, 1);
 622         if (IS_ERR(fid)) {
 623                 err = PTR_ERR(fid);
 624                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 625                 fid = NULL;
 626                 goto error;
 627         }
 628
 629         /* instantiate inode and assign the unopened fid to the dentry */
 630         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 631         if (IS_ERR(inode)) {
 632                 err = PTR_ERR(inode);
 633                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 634                 goto error;
 635         }
 636
 637         if (v9ses->cache)
 638                 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
 639         else
 640                 d_set_d_op(dentry, &v9fs_dentry_operations);
 641
 642         d_instantiate(dentry, inode);
 643         err = v9fs_fid_add(dentry, fid);
 644         if (err < 0)
 645                 goto error;
 646
 647         return ofid;
 648
 649 error:
 650         if (ofid)
 651                 p9_client_clunk(ofid);
 652
 653         if (fid)
 654                 p9_client_clunk(fid);
 655
 656         return ERR_PTR(err);
 657 }
 658
 659 /**
 660  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 661  * @dir: directory inode that is being created
 662  * @dentry:  dentry that is being deleted
 663  * @mode: create permissions
 664  * @nd: path information
 665  *
 666  */
 667
 668 static int
 669 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 670                 struct nameidata *nd)
 671 {
 672         int err = 0;
 673         char *name = NULL;
 674         gid_t gid;
 675         int flags;
 676         mode_t mode;
 677         struct v9fs_session_info *v9ses;
 678         struct p9_fid *fid = NULL;
 679         struct p9_fid *dfid, *ofid;
 680         struct file *filp;
 681         struct p9_qid qid;
 682         struct inode *inode;
 683         struct posix_acl *pacl = NULL, *dacl = NULL;
 684
 685         v9ses = v9fs_inode2v9ses(dir);
 686         if (nd && nd->flags & LOOKUP_OPEN)
 687                 flags = nd->intent.open.flags - 1;
 688         else {
 689                 /*
 690                  * create call without LOOKUP_OPEN is due
 691                  * to mknod of regular files. So use mknod
 692                  * operation.
 693                  */
 694                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 695         }
 696
 697         name = (char *) dentry->d_name.name;
 698         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 699                         "mode:0x%x\n", name, flags, omode);
 700
 701         dfid = v9fs_fid_lookup(dentry->d_parent);
 702         if (IS_ERR(dfid)) {
 703                 err = PTR_ERR(dfid);
 704                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 705                 return err;
 706         }
 707
 708         /* clone a fid to use for creation */
 709         ofid = p9_client_walk(dfid, 0, NULL, 1);
 710         if (IS_ERR(ofid)) {
 711                 err = PTR_ERR(ofid);
 712                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 713                 return err;
 714         }
 715
 716         gid = v9fs_get_fsgid_for_create(dir);
 717
 718         mode = omode;
 719         /* Update mode based on ACL value */
 720         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 721         if (err) {
 722                 P9_DPRINTK(P9_DEBUG_VFS,
 723                            "Failed to get acl values in creat %d\n", err);
 724                 goto error;
 725         }
 726         err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
 727         if (err < 0) {
 728                 P9_DPRINTK(P9_DEBUG_VFS,
 729                                 "p9_client_open_dotl failed in creat %d\n",
 730                                 err);
 731                 goto error;
 732         }
 733         /* instantiate inode and assign the unopened fid to the dentry */
 734         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE ||
 735             (nd && nd->flags & LOOKUP_OPEN)) {
 736                 fid = p9_client_walk(dfid, 1, &name, 1);
 737                 if (IS_ERR(fid)) {
 738                         err = PTR_ERR(fid);
 739                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 740                                 err);
 741                         fid = NULL;
 742                         goto error;
 743                 }
 744
 745                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 746                 if (IS_ERR(inode)) {
 747                         err = PTR_ERR(inode);
 748                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 749                                 err);
 750                         goto error;
 751                 }
 752                 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
 753                 d_instantiate(dentry, inode);
 754                 err = v9fs_fid_add(dentry, fid);
 755                 if (err < 0)
 756                         goto error;
 757                 /* The fid would get clunked via a dput */
 758                 fid = NULL;
 759         } else {
 760                 /*
 761                  * Not in cached mode. No need to populate
 762                  * inode with stat. We need to get an inode
 763                  * so that we can set the acl with dentry
 764                  */
 765                 inode = v9fs_get_inode(dir->i_sb, mode);
 766                 if (IS_ERR(inode)) {
 767                         err = PTR_ERR(inode);
 768                         goto error;
 769                 }
 770                 d_set_d_op(dentry, &v9fs_dentry_operations);
 771                 d_instantiate(dentry, inode);
 772         }
 773         /* Now set the ACL based on the default value */
 774         v9fs_set_create_acl(dentry, dacl, pacl);
 775
 776         /* if we are opening a file, assign the open fid to the file */
 777         if (nd && nd->flags & LOOKUP_OPEN) {
 778                 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 779                 if (IS_ERR(filp)) {
 780                         p9_client_clunk(ofid);
 781                         return PTR_ERR(filp);
 782                 }
 783                 filp->private_data = ofid;
 784         } else
 785                 p9_client_clunk(ofid);
 786
 787         return 0;
 788
 789 error:
 790         if (ofid)
 791                 p9_client_clunk(ofid);
 792         if (fid)
 793                 p9_client_clunk(fid);
 794         return err;
 795 }
 796
 797 /**
 798  * v9fs_vfs_create - VFS hook to create files
 799  * @dir: directory inode that is being created
 800  * @dentry:  dentry that is being deleted
 801  * @mode: create permissions
 802  * @nd: path information
 803  *
 804  */
 805
 806 static int
 807 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
 808                 struct nameidata *nd)
 809 {
 810         int err;
 811         u32 perm;
 812         int flags;
 813         struct v9fs_session_info *v9ses;
 814         struct p9_fid *fid;
 815         struct file *filp;
 816
 817         err = 0;
 818         fid = NULL;
 819         v9ses = v9fs_inode2v9ses(dir);
 820         perm = unixmode2p9mode(v9ses, mode);
 821         if (nd && nd->flags & LOOKUP_OPEN)
 822                 flags = nd->intent.open.flags - 1;
 823         else
 824                 flags = O_RDWR;
 825
 826         fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
 827                                 v9fs_uflags2omode(flags,
 828                                                 v9fs_proto_dotu(v9ses)));
 829         if (IS_ERR(fid)) {
 830                 err = PTR_ERR(fid);
 831                 fid = NULL;
 832                 goto error;
 833         }
 834
 835         /* if we are opening a file, assign the open fid to the file */
 836         if (nd && nd->flags & LOOKUP_OPEN) {
 837                 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 838                 if (IS_ERR(filp)) {
 839                         err = PTR_ERR(filp);
 840                         goto error;
 841                 }
 842
 843                 filp->private_data = fid;
 844         } else
 845                 p9_client_clunk(fid);
 846
 847         return 0;
 848
 849 error:
 850         if (fid)
 851                 p9_client_clunk(fid);
 852
 853         return err;
 854 }
 855
 856 /**
 857  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
 858  * @dir:  inode that is being unlinked
 859  * @dentry: dentry that is being unlinked
 860  * @mode: mode for new directory
 861  *
 862  */
 863
 864 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 865 {
 866         int err;
 867         u32 perm;
 868         struct v9fs_session_info *v9ses;
 869         struct p9_fid *fid;
 870
 871         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 872         err = 0;
 873         v9ses = v9fs_inode2v9ses(dir);
 874         perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
 875         fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
 876         if (IS_ERR(fid)) {
 877                 err = PTR_ERR(fid);
 878                 fid = NULL;
 879         }
 880
 881         if (fid)
 882                 p9_client_clunk(fid);
 883
 884         return err;
 885 }
 886
 887
 888 /**
 889  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 890  * @dir:  inode that is being unlinked
 891  * @dentry: dentry that is being unlinked
 892  * @mode: mode for new directory
 893  *
 894  */
 895
 896 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 897                                struct dentry *dentry, int omode)
 898 {
 899         int err;
 900         struct v9fs_session_info *v9ses;
 901         struct p9_fid *fid = NULL, *dfid = NULL;
 902         gid_t gid;
 903         char *name;
 904         mode_t mode;
 905         struct inode *inode;
 906         struct p9_qid qid;
 907         struct dentry *dir_dentry;
 908         struct posix_acl *dacl = NULL, *pacl = NULL;
 909
 910         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 911         err = 0;
 912         v9ses = v9fs_inode2v9ses(dir);
 913
 914         omode |= S_IFDIR;
 915         if (dir->i_mode & S_ISGID)
 916                 omode |= S_ISGID;
 917
 918         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 919         dfid = v9fs_fid_lookup(dir_dentry);
 920         if (IS_ERR(dfid)) {
 921                 err = PTR_ERR(dfid);
 922                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 923                 dfid = NULL;
 924                 goto error;
 925         }
 926
 927         gid = v9fs_get_fsgid_for_create(dir);
 928         mode = omode;
 929         /* Update mode based on ACL value */
 930         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 931         if (err) {
 932                 P9_DPRINTK(P9_DEBUG_VFS,
 933                            "Failed to get acl values in mkdir %d\n", err);
 934                 goto error;
 935         }
 936         name = (char *) dentry->d_name.name;
 937         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 938         if (err < 0)
 939                 goto error;
 940
 941         /* instantiate inode and assign the unopened fid to the dentry */
 942         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 943                 fid = p9_client_walk(dfid, 1, &name, 1);
 944                 if (IS_ERR(fid)) {
 945                         err = PTR_ERR(fid);
 946                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 947                                 err);
 948                         fid = NULL;
 949                         goto error;
 950                 }
 951
 952                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
 953                 if (IS_ERR(inode)) {
 954                         err = PTR_ERR(inode);
 955                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 956                                 err);
 957                         goto error;
 958                 }
 959                 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
 960                 d_instantiate(dentry, inode);
 961                 err = v9fs_fid_add(dentry, fid);
 962                 if (err < 0)
 963                         goto error;
 964                 fid = NULL;
 965         } else {
 966                 /*
 967                  * Not in cached mode. No need to populate
 968                  * inode with stat. We need to get an inode
 969                  * so that we can set the acl with dentry
 970                  */
 971                 inode = v9fs_get_inode(dir->i_sb, mode);
 972                 if (IS_ERR(inode)) {
 973                         err = PTR_ERR(inode);
 974                         goto error;
 975                 }
 976                 d_set_d_op(dentry, &v9fs_dentry_operations);
 977                 d_instantiate(dentry, inode);
 978         }
 979         /* Now set the ACL based on the default value */
 980         v9fs_set_create_acl(dentry, dacl, pacl);
 981
 982 error:
 983         if (fid)
 984                 p9_client_clunk(fid);
 985         return err;
 986 }
 987
 988 /**
 989  * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
 990  * @dir:  inode that is being walked from
 991  * @dentry: dentry that is being walked to?
 992  * @nameidata: path data
 993  *
 994  */
 995
 996 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 997                                       struct nameidata *nameidata)
 998 {
 999         struct super_block *sb;
1000         struct v9fs_session_info *v9ses;
1001         struct p9_fid *dfid, *fid;
1002         struct inode *inode;
1003         char *name;
1004         int result = 0;
1005
1006         P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
1007                 dir, dentry->d_name.name, dentry, nameidata);
1008
1009         if (dentry->d_name.len > NAME_MAX)
1010                 return ERR_PTR(-ENAMETOOLONG);
1011
1012         sb = dir->i_sb;
1013         v9ses = v9fs_inode2v9ses(dir);
1014         /* We can walk d_parent because we hold the dir->i_mutex */
1015         dfid = v9fs_fid_lookup(dentry->d_parent);
1016         if (IS_ERR(dfid))
1017                 return ERR_CAST(dfid);
1018
1019         name = (char *) dentry->d_name.name;
1020         fid = p9_client_walk(dfid, 1, &name, 1);
1021         if (IS_ERR(fid)) {
1022                 result = PTR_ERR(fid);
1023                 if (result == -ENOENT) {
1024                         inode = NULL;
1025                         goto inst_out;
1026                 }
1027
1028                 return ERR_PTR(result);
1029         }
1030
1031         inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1032         if (IS_ERR(inode)) {
1033                 result = PTR_ERR(inode);
1034                 inode = NULL;
1035                 goto error;
1036         }
1037
1038         result = v9fs_fid_add(dentry, fid);
1039         if (result < 0)
1040                 goto error_iput;
1041
1042 inst_out:
1043         if (v9ses->cache)
1044                 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
1045         else
1046                 d_set_d_op(dentry, &v9fs_dentry_operations);
1047
1048         d_add(dentry, inode);
1049         return NULL;
1050
1051 error_iput:
1052         iput(inode);
1053 error:
1054         p9_client_clunk(fid);
1055
1056         return ERR_PTR(result);
1057 }
1058
1059 /**
1060  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
1061  * @i:  inode that is being unlinked
1062  * @d: dentry that is being unlinked
1063  *
1064  */
1065
1066 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
1067 {
1068         return v9fs_remove(i, d, 0);
1069 }
1070
1071 /**
1072  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
1073  * @i:  inode that is being unlinked
1074  * @d: dentry that is being unlinked
1075  *
1076  */
1077
1078 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
1079 {
1080         return v9fs_remove(i, d, 1);
1081 }
1082
1083 /**
1084  * v9fs_vfs_rename - VFS hook to rename an inode
1085  * @old_dir:  old dir inode
1086  * @old_dentry: old dentry
1087  * @new_dir: new dir inode
1088  * @new_dentry: new dentry
1089  *
1090  */
1091
1092 static int
1093 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1094                 struct inode *new_dir, struct dentry *new_dentry)
1095 {
1096         struct inode *old_inode;
1097         struct v9fs_session_info *v9ses;
1098         struct p9_fid *oldfid;
1099         struct p9_fid *olddirfid;
1100         struct p9_fid *newdirfid;
1101         struct p9_wstat wstat;
1102         int retval;
1103
1104         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1105         retval = 0;
1106         old_inode = old_dentry->d_inode;
1107         v9ses = v9fs_inode2v9ses(old_inode);
1108         oldfid = v9fs_fid_lookup(old_dentry);
1109         if (IS_ERR(oldfid))
1110                 return PTR_ERR(oldfid);
1111
1112         olddirfid = v9fs_fid_clone(old_dentry->d_parent);
1113         if (IS_ERR(olddirfid)) {
1114                 retval = PTR_ERR(olddirfid);
1115                 goto done;
1116         }
1117
1118         newdirfid = v9fs_fid_clone(new_dentry->d_parent);
1119         if (IS_ERR(newdirfid)) {
1120                 retval = PTR_ERR(newdirfid);
1121                 goto clunk_olddir;
1122         }
1123
1124         down_write(&v9ses->rename_sem);
1125         if (v9fs_proto_dotl(v9ses)) {
1126                 retval = p9_client_rename(oldfid, newdirfid,
1127                                         (char *) new_dentry->d_name.name);
1128                 if (retval != -ENOSYS)
1129                         goto clunk_newdir;
1130         }
1131         if (old_dentry->d_parent != new_dentry->d_parent) {
1132                 /*
1133                  * 9P .u can only handle file rename in the same directory
1134                  */
1135
1136                 P9_DPRINTK(P9_DEBUG_ERROR,
1137                                 "old dir and new dir are different\n");
1138                 retval = -EXDEV;
1139                 goto clunk_newdir;
1140         }
1141         v9fs_blank_wstat(&wstat);
1142         wstat.muid = v9ses->uname;
1143         wstat.name = (char *) new_dentry->d_name.name;
1144         retval = p9_client_wstat(oldfid, &wstat);
1145
1146 clunk_newdir:
1147         if (!retval)
1148                 /* successful rename */
1149                 d_move(old_dentry, new_dentry);
1150         up_write(&v9ses->rename_sem);
1151         p9_client_clunk(newdirfid);
1152
1153 clunk_olddir:
1154         p9_client_clunk(olddirfid);
1155
1156 done:
1157         return retval;
1158 }
1159
1160 /**
1161  * v9fs_vfs_getattr - retrieve file metadata
1162  * @mnt: mount information
1163  * @dentry: file to get attributes on
1164  * @stat: metadata structure to populate
1165  *
1166  */
1167
1168 static int
1169 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1170                  struct kstat *stat)
1171 {
1172         int err;
1173         struct v9fs_session_info *v9ses;
1174         struct p9_fid *fid;
1175         struct p9_wstat *st;
1176
1177         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1178         err = -EPERM;
1179         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1180         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1181                 return simple_getattr(mnt, dentry, stat);
1182
1183         fid = v9fs_fid_lookup(dentry);
1184         if (IS_ERR(fid))
1185                 return PTR_ERR(fid);
1186
1187         st = p9_client_stat(fid);
1188         if (IS_ERR(st))
1189                 return PTR_ERR(st);
1190
1191         v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1192                 generic_fillattr(dentry->d_inode, stat);
1193
1194         p9stat_free(st);
1195         kfree(st);
1196         return 0;
1197 }
1198
1199 static int
1200 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
1201                  struct kstat *stat)
1202 {
1203         int err;
1204         struct v9fs_session_info *v9ses;
1205         struct p9_fid *fid;
1206         struct p9_stat_dotl *st;
1207
1208         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1209         err = -EPERM;
1210         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1211         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1212                 return simple_getattr(mnt, dentry, stat);
1213
1214         fid = v9fs_fid_lookup(dentry);
1215         if (IS_ERR(fid))
1216                 return PTR_ERR(fid);
1217
1218         /* Ask for all the fields in stat structure. Server will return
1219          * whatever it supports
1220          */
1221
1222         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
1223         if (IS_ERR(st))
1224                 return PTR_ERR(st);
1225
1226         v9fs_stat2inode_dotl(st, dentry->d_inode);
1227         generic_fillattr(dentry->d_inode, stat);
1228         /* Change block size to what the server returned */
1229         stat->blksize = st->st_blksize;
1230
1231         kfree(st);
1232         return 0;
1233 }
1234
1235 /**
1236  * v9fs_vfs_setattr - set file metadata
1237  * @dentry: file whose metadata to set
1238  * @iattr: metadata assignment structure
1239  *
1240  */
1241
1242 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1243 {
1244         int retval;
1245         struct v9fs_session_info *v9ses;
1246         struct p9_fid *fid;
1247         struct p9_wstat wstat;
1248
1249         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1250         retval = -EPERM;
1251         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1252         fid = v9fs_fid_lookup(dentry);
1253         if(IS_ERR(fid))
1254                 return PTR_ERR(fid);
1255
1256         v9fs_blank_wstat(&wstat);
1257         if (iattr->ia_valid & ATTR_MODE)
1258                 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1259
1260         if (iattr->ia_valid & ATTR_MTIME)
1261                 wstat.mtime = iattr->ia_mtime.tv_sec;
1262
1263         if (iattr->ia_valid & ATTR_ATIME)
1264                 wstat.atime = iattr->ia_atime.tv_sec;
1265
1266         if (iattr->ia_valid & ATTR_SIZE)
1267                 wstat.length = iattr->ia_size;
1268
1269         if (v9fs_proto_dotu(v9ses)) {
1270                 if (iattr->ia_valid & ATTR_UID)
1271                         wstat.n_uid = iattr->ia_uid;
1272
1273                 if (iattr->ia_valid & ATTR_GID)
1274                         wstat.n_gid = iattr->ia_gid;
1275         }
1276
1277         retval = p9_client_wstat(fid, &wstat);
1278         if (retval < 0)
1279                 return retval;
1280
1281         if ((iattr->ia_valid & ATTR_SIZE) &&
1282             iattr->ia_size != i_size_read(dentry->d_inode)) {
1283                 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1284                 if (retval)
1285                         return retval;
1286         }
1287
1288         setattr_copy(dentry->d_inode, iattr);
1289         mark_inode_dirty(dentry->d_inode);
1290         return 0;
1291 }
1292
1293 /**
1294  * v9fs_vfs_setattr_dotl - set file metadata
1295  * @dentry: file whose metadata to set
1296  * @iattr: metadata assignment structure
1297  *
1298  */
1299
1300 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
1301 {
1302         int retval;
1303         struct v9fs_session_info *v9ses;
1304         struct p9_fid *fid;
1305         struct p9_iattr_dotl p9attr;
1306
1307         P9_DPRINTK(P9_DEBUG_VFS, "\n");
1308
1309         retval = inode_change_ok(dentry->d_inode, iattr);
1310         if (retval)
1311                 return retval;
1312
1313         p9attr.valid = iattr->ia_valid;
1314         p9attr.mode = iattr->ia_mode;
1315         p9attr.uid = iattr->ia_uid;
1316         p9attr.gid = iattr->ia_gid;
1317         p9attr.size = iattr->ia_size;
1318         p9attr.atime_sec = iattr->ia_atime.tv_sec;
1319         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
1320         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
1321         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
1322
1323         retval = -EPERM;
1324         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1325         fid = v9fs_fid_lookup(dentry);
1326         if (IS_ERR(fid))
1327                 return PTR_ERR(fid);
1328
1329         retval = p9_client_setattr(fid, &p9attr);
1330         if (retval < 0)
1331                 return retval;
1332
1333         if ((iattr->ia_valid & ATTR_SIZE) &&
1334             iattr->ia_size != i_size_read(dentry->d_inode)) {
1335                 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1336                 if (retval)
1337                         return retval;
1338         }
1339
1340         setattr_copy(dentry->d_inode, iattr);
1341         mark_inode_dirty(dentry->d_inode);
1342         if (iattr->ia_valid & ATTR_MODE) {
1343                 /* We also want to update ACL when we update mode bits */
1344                 retval = v9fs_acl_chmod(dentry);
1345                 if (retval < 0)
1346                         return retval;
1347         }
1348         return 0;
1349 }
1350
1351 /**
1352  * v9fs_stat2inode - populate an inode structure with mistat info
1353  * @stat: Plan 9 metadata (mistat) structure
1354  * @inode: inode to populate
1355  * @sb: superblock of filesystem
1356  *
1357  */
1358
1359 void
1360 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1361         struct super_block *sb)
1362 {
1363         char ext[32];
1364         char tag_name[14];
1365         unsigned int i_nlink;
1366         struct v9fs_session_info *v9ses = sb->s_fs_info;
1367
1368         inode->i_nlink = 1;
1369
1370         inode->i_atime.tv_sec = stat->atime;
1371         inode->i_mtime.tv_sec = stat->mtime;
1372         inode->i_ctime.tv_sec = stat->mtime;
1373
1374         inode->i_uid = v9ses->dfltuid;
1375         inode->i_gid = v9ses->dfltgid;
1376
1377         if (v9fs_proto_dotu(v9ses)) {
1378                 inode->i_uid = stat->n_uid;
1379                 inode->i_gid = stat->n_gid;
1380         }
1381         if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1382                 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1383                         /*
1384                          * Hadlink support got added later to
1385                          * to the .u extension. So there can be
1386                          * server out there that doesn't support
1387                          * this even with .u extension. So check
1388                          * for non NULL stat->extension
1389                          */
1390                         strncpy(ext, stat->extension, sizeof(ext));
1391                         /* HARDLINKCOUNT %u */
1392                         sscanf(ext, "%13s %u", tag_name, &i_nlink);
1393                         if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1394                                 inode->i_nlink = i_nlink;
1395                 }
1396         }
1397         inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1398         if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1399                 char type = 0;
1400                 int major = -1;
1401                 int minor = -1;
1402
1403                 strncpy(ext, stat->extension, sizeof(ext));
1404                 sscanf(ext, "%c %u %u", &type, &major, &minor);
1405                 switch (type) {
1406                 case 'c':
1407                         inode->i_mode &= ~S_IFBLK;
1408                         inode->i_mode |= S_IFCHR;
1409                         break;
1410                 case 'b':
1411                         break;
1412                 default:
1413                         P9_DPRINTK(P9_DEBUG_ERROR,
1414                                 "Unknown special type %c %s\n", type,
1415                                 stat->extension);
1416                 };
1417                 inode->i_rdev = MKDEV(major, minor);
1418                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1419         } else
1420                 inode->i_rdev = 0;
1421
1422         i_size_write(inode, stat->length);
1423
1424         /* not real number of blocks, but 512 byte ones ... */
1425         inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1426 }
1427
1428 /**
1429  * v9fs_stat2inode_dotl - populate an inode structure with stat info
1430  * @stat: stat structure
1431  * @inode: inode to populate
1432  * @sb: superblock of filesystem
1433  *
1434  */
1435
1436 void
1437 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
1438 {
1439
1440         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
1441                 inode->i_atime.tv_sec = stat->st_atime_sec;
1442                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
1443                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
1444                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1445                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
1446                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1447                 inode->i_uid = stat->st_uid;
1448                 inode->i_gid = stat->st_gid;
1449                 inode->i_nlink = stat->st_nlink;
1450                 inode->i_mode = stat->st_mode;
1451                 inode->i_rdev = new_decode_dev(stat->st_rdev);
1452
1453                 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
1454                         init_special_inode(inode, inode->i_mode, inode->i_rdev);
1455
1456                 i_size_write(inode, stat->st_size);
1457                 inode->i_blocks = stat->st_blocks;
1458         } else {
1459                 if (stat->st_result_mask & P9_STATS_ATIME) {
1460                         inode->i_atime.tv_sec = stat->st_atime_sec;
1461                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
1462                 }
1463                 if (stat->st_result_mask & P9_STATS_MTIME) {
1464                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
1465                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1466                 }
1467                 if (stat->st_result_mask & P9_STATS_CTIME) {
1468                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
1469                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1470                 }
1471                 if (stat->st_result_mask & P9_STATS_UID)
1472                         inode->i_uid = stat->st_uid;
1473                 if (stat->st_result_mask & P9_STATS_GID)
1474                         inode->i_gid = stat->st_gid;
1475                 if (stat->st_result_mask & P9_STATS_NLINK)
1476                         inode->i_nlink = stat->st_nlink;
1477                 if (stat->st_result_mask & P9_STATS_MODE) {
1478                         inode->i_mode = stat->st_mode;
1479                         if ((S_ISBLK(inode->i_mode)) ||
1480                                                 (S_ISCHR(inode->i_mode)))
1481                                 init_special_inode(inode, inode->i_mode,
1482                                                                 inode->i_rdev);
1483                 }
1484                 if (stat->st_result_mask & P9_STATS_RDEV)
1485                         inode->i_rdev = new_decode_dev(stat->st_rdev);
1486                 if (stat->st_result_mask & P9_STATS_SIZE)
1487                         i_size_write(inode, stat->st_size);
1488                 if (stat->st_result_mask & P9_STATS_BLOCKS)
1489                         inode->i_blocks = stat->st_blocks;
1490         }
1491         if (stat->st_result_mask & P9_STATS_GEN)
1492                         inode->i_generation = stat->st_gen;
1493
1494         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
1495          * because the inode structure does not have fields for them.
1496          */
1497 }
1498
1499 /**
1500  * v9fs_qid2ino - convert qid into inode number
1501  * @qid: qid to hash
1502  *
1503  * BUG: potential for inode number collisions?
1504  */
1505
1506 ino_t v9fs_qid2ino(struct p9_qid *qid)
1507 {
1508         u64 path = qid->path + 2;
1509         ino_t i = 0;
1510
1511         if (sizeof(ino_t) == sizeof(path))
1512                 memcpy(&i, &path, sizeof(ino_t));
1513         else
1514                 i = (ino_t) (path ^ (path >> 32));
1515
1516         return i;
1517 }
1518
1519 /**
1520  * v9fs_readlink - read a symlink's location (internal version)
1521  * @dentry: dentry for symlink
1522  * @buffer: buffer to load symlink location into
1523  * @buflen: length of buffer
1524  *
1525  */
1526
1527 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1528 {
1529         int retval;
1530
1531         struct v9fs_session_info *v9ses;
1532         struct p9_fid *fid;
1533         struct p9_wstat *st;
1534
1535         P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1536         retval = -EPERM;
1537         v9ses = v9fs_inode2v9ses(dentry->d_inode);
1538         fid = v9fs_fid_lookup(dentry);
1539         if (IS_ERR(fid))
1540                 return PTR_ERR(fid);
1541
1542         if (!v9fs_proto_dotu(v9ses))
1543                 return -EBADF;
1544
1545         st = p9_client_stat(fid);
1546         if (IS_ERR(st))
1547                 return PTR_ERR(st);
1548
1549         if (!(st->mode & P9_DMSYMLINK)) {
1550                 retval = -EINVAL;
1551                 goto done;
1552         }
1553
1554         /* copy extension buffer into buffer */
1555         strncpy(buffer, st->extension, buflen);
1556
1557         P9_DPRINTK(P9_DEBUG_VFS,
1558                 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1559
1560         retval = strnlen(buffer, buflen);
1561 done:
1562         p9stat_free(st);
1563         kfree(st);
1564         return retval;
1565 }
1566
1567 /**
1568  * v9fs_vfs_follow_link - follow a symlink path
1569  * @dentry: dentry for symlink
1570  * @nd: nameidata
1571  *
1572  */
1573
1574 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1575 {
1576         int len = 0;
1577         char *link = __getname();
1578
1579         P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1580
1581         if (!link)
1582                 link = ERR_PTR(-ENOMEM);
1583         else {
1584                 len = v9fs_readlink(dentry, link, PATH_MAX);
1585
1586                 if (len < 0) {
1587                         __putname(link);
1588                         link = ERR_PTR(len);
1589                 } else
1590                         link[min(len, PATH_MAX-1)] = 0;
1591         }
1592         nd_set_link(nd, link);
1593
1594         return NULL;
1595 }
1596
1597 /**
1598  * v9fs_vfs_put_link - release a symlink path
1599  * @dentry: dentry for symlink
1600  * @nd: nameidata
1601  * @p: unused
1602  *
1603  */
1604
1605 static void
1606 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1607 {
1608         char *s = nd_get_link(nd);
1609
1610         P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1611                 IS_ERR(s) ? "<error>" : s);
1612         if (!IS_ERR(s))
1613                 __putname(s);
1614 }
1615
1616 /**
1617  * v9fs_vfs_mkspecial - create a special file
1618  * @dir: inode to create special file in
1619  * @dentry: dentry to create
1620  * @mode: mode to create special file
1621  * @extension: 9p2000.u format extension string representing special file
1622  *
1623  */
1624
1625 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1626         int mode, const char *extension)
1627 {
1628         u32 perm;
1629         struct v9fs_session_info *v9ses;
1630         struct p9_fid *fid;
1631
1632         v9ses = v9fs_inode2v9ses(dir);
1633         if (!v9fs_proto_dotu(v9ses)) {
1634                 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1635                 return -EPERM;
1636         }
1637
1638         perm = unixmode2p9mode(v9ses, mode);
1639         fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1640                                                                 P9_OREAD);
1641         if (IS_ERR(fid))
1642                 return PTR_ERR(fid);
1643
1644         p9_client_clunk(fid);
1645         return 0;
1646 }
1647
1648 /**
1649  * v9fs_vfs_symlink_dotl - helper function to create symlinks
1650  * @dir: directory inode containing symlink
1651  * @dentry: dentry for symlink
1652  * @symname: symlink data
1653  *
1654  * See Also: 9P2000.L RFC for more information
1655  *
1656  */
1657
1658 static int
1659 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
1660                 const char *symname)
1661 {
1662         struct v9fs_session_info *v9ses;
1663         struct p9_fid *dfid;
1664         struct p9_fid *fid = NULL;
1665         struct inode *inode;
1666         struct p9_qid qid;
1667         char *name;
1668         int err;
1669         gid_t gid;
1670
1671         name = (char *) dentry->d_name.name;
1672         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
1673                         dir->i_ino, name, symname);
1674         v9ses = v9fs_inode2v9ses(dir);
1675
1676         dfid = v9fs_fid_lookup(dentry->d_parent);
1677         if (IS_ERR(dfid)) {
1678                 err = PTR_ERR(dfid);
1679                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1680                 return err;
1681         }
1682
1683         gid = v9fs_get_fsgid_for_create(dir);
1684
1685         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
1686         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
1687
1688         if (err < 0) {
1689                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
1690                 goto error;
1691         }
1692
1693         if (v9ses->cache) {
1694                 /* Now walk from the parent so we can get an unopened fid. */
1695                 fid = p9_client_walk(dfid, 1, &name, 1);
1696                 if (IS_ERR(fid)) {
1697                         err = PTR_ERR(fid);
1698                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1699                                         err);
1700                         fid = NULL;
1701                         goto error;
1702                 }
1703
1704                 /* instantiate inode and assign the unopened fid to dentry */
1705                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1706                 if (IS_ERR(inode)) {
1707                         err = PTR_ERR(inode);
1708                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1709                                         err);
1710                         goto error;
1711                 }
1712                 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
1713                 d_instantiate(dentry, inode);
1714                 err = v9fs_fid_add(dentry, fid);
1715                 if (err < 0)
1716                         goto error;
1717                 fid = NULL;
1718         } else {
1719                 /* Not in cached mode. No need to populate inode with stat */
1720                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
1721                 if (IS_ERR(inode)) {
1722                         err = PTR_ERR(inode);
1723                         goto error;
1724                 }
1725                 d_set_d_op(dentry, &v9fs_dentry_operations);
1726                 d_instantiate(dentry, inode);
1727         }
1728
1729 error:
1730         if (fid)
1731                 p9_client_clunk(fid);
1732
1733         return err;
1734 }
1735
1736 /**
1737  * v9fs_vfs_symlink - helper function to create symlinks
1738  * @dir: directory inode containing symlink
1739  * @dentry: dentry for symlink
1740  * @symname: symlink data
1741  *
1742  * See Also: 9P2000.u RFC for more information
1743  *
1744  */
1745
1746 static int
1747 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1748 {
1749         P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1750                                         dentry->d_name.name, symname);
1751
1752         return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1753 }
1754
1755 /**
1756  * v9fs_vfs_link - create a hardlink
1757  * @old_dentry: dentry for file to link to
1758  * @dir: inode destination for new link
1759  * @dentry: dentry for link
1760  *
1761  */
1762
1763 static int
1764 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1765               struct dentry *dentry)
1766 {
1767         int retval;
1768         struct p9_fid *oldfid;
1769         char *name;
1770
1771         P9_DPRINTK(P9_DEBUG_VFS,
1772                 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1773                 old_dentry->d_name.name);
1774
1775         oldfid = v9fs_fid_clone(old_dentry);
1776         if (IS_ERR(oldfid))
1777                 return PTR_ERR(oldfid);
1778
1779         name = __getname();
1780         if (unlikely(!name)) {
1781                 retval = -ENOMEM;
1782                 goto clunk_fid;
1783         }
1784
1785         sprintf(name, "%d\n", oldfid->fid);
1786         retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1787         __putname(name);
1788
1789 clunk_fid:
1790         p9_client_clunk(oldfid);
1791         return retval;
1792 }
1793
1794 /**
1795  * v9fs_vfs_link_dotl - create a hardlink for dotl
1796  * @old_dentry: dentry for file to link to
1797  * @dir: inode destination for new link
1798  * @dentry: dentry for link
1799  *
1800  */
1801
1802 static int
1803 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
1804                 struct dentry *dentry)
1805 {
1806         int err;
1807         struct p9_fid *dfid, *oldfid;
1808         char *name;
1809         struct v9fs_session_info *v9ses;
1810         struct dentry *dir_dentry;
1811
1812         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
1813                         dir->i_ino, old_dentry->d_name.name,
1814                         dentry->d_name.name);
1815
1816         v9ses = v9fs_inode2v9ses(dir);
1817         dir_dentry = v9fs_dentry_from_dir_inode(dir);
1818         dfid = v9fs_fid_lookup(dir_dentry);
1819         if (IS_ERR(dfid))
1820                 return PTR_ERR(dfid);
1821
1822         oldfid = v9fs_fid_lookup(old_dentry);
1823         if (IS_ERR(oldfid))
1824                 return PTR_ERR(oldfid);
1825
1826         name = (char *) dentry->d_name.name;
1827
1828         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
1829
1830         if (err < 0) {
1831                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
1832                 return err;
1833         }
1834
1835         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1836                 /* Get the latest stat info from server. */
1837                 struct p9_fid *fid;
1838                 struct p9_stat_dotl *st;
1839
1840                 fid = v9fs_fid_lookup(old_dentry);
1841                 if (IS_ERR(fid))
1842                         return PTR_ERR(fid);
1843
1844                 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
1845                 if (IS_ERR(st))
1846                         return PTR_ERR(st);
1847
1848                 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
1849
1850                 kfree(st);
1851         } else {
1852                 /* Caching disabled. No need to get upto date stat info.
1853                  * This dentry will be released immediately. So, just hold the
1854                  * inode
1855                  */
1856                 ihold(old_dentry->d_inode);
1857         }
1858
1859         d_set_d_op(dentry, old_dentry->d_op);
1860         d_instantiate(dentry, old_dentry->d_inode);
1861
1862         return err;
1863 }
1864
1865 /**
1866  * v9fs_vfs_mknod - create a special file
1867  * @dir: inode destination for new link
1868  * @dentry: dentry for file
1869  * @mode: mode for creation
1870  * @rdev: device associated with special file
1871  *
1872  */
1873
1874 static int
1875 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1876 {
1877         int retval;
1878         char *name;
1879
1880         P9_DPRINTK(P9_DEBUG_VFS,
1881                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1882                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1883
1884         if (!new_valid_dev(rdev))
1885                 return -EINVAL;
1886
1887         name = __getname();
1888         if (!name)
1889                 return -ENOMEM;
1890         /* build extension */
1891         if (S_ISBLK(mode))
1892                 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1893         else if (S_ISCHR(mode))
1894                 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1895         else if (S_ISFIFO(mode))
1896                 *name = 0;
1897         else if (S_ISSOCK(mode))
1898                 *name = 0;
1899         else {
1900                 __putname(name);
1901                 return -EINVAL;
1902         }
1903
1904         retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1905         __putname(name);
1906
1907         return retval;
1908 }
1909
1910 /**
1911  * v9fs_vfs_mknod_dotl - create a special file
1912  * @dir: inode destination for new link
1913  * @dentry: dentry for file
1914  * @mode: mode for creation
1915  * @rdev: device associated with special file
1916  *
1917  */
1918 static int
1919 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
1920                 dev_t rdev)
1921 {
1922         int err;
1923         char *name;
1924         mode_t mode;
1925         struct v9fs_session_info *v9ses;
1926         struct p9_fid *fid = NULL, *dfid = NULL;
1927         struct inode *inode;
1928         gid_t gid;
1929         struct p9_qid qid;
1930         struct dentry *dir_dentry;
1931         struct posix_acl *dacl = NULL, *pacl = NULL;
1932
1933         P9_DPRINTK(P9_DEBUG_VFS,
1934                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1935                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
1936
1937         if (!new_valid_dev(rdev))
1938                 return -EINVAL;
1939
1940         v9ses = v9fs_inode2v9ses(dir);
1941         dir_dentry = v9fs_dentry_from_dir_inode(dir);
1942         dfid = v9fs_fid_lookup(dir_dentry);
1943         if (IS_ERR(dfid)) {
1944                 err = PTR_ERR(dfid);
1945                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1946                 dfid = NULL;
1947                 goto error;
1948         }
1949
1950         gid = v9fs_get_fsgid_for_create(dir);
1951         mode = omode;
1952         /* Update mode based on ACL value */
1953         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
1954         if (err) {
1955                 P9_DPRINTK(P9_DEBUG_VFS,
1956                            "Failed to get acl values in mknod %d\n", err);
1957                 goto error;
1958         }
1959         name = (char *) dentry->d_name.name;
1960
1961         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
1962         if (err < 0)
1963                 goto error;
1964
1965         /* instantiate inode and assign the unopened fid to the dentry */
1966         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1967                 fid = p9_client_walk(dfid, 1, &name, 1);
1968                 if (IS_ERR(fid)) {
1969                         err = PTR_ERR(fid);
1970                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1971                                 err);
1972                         fid = NULL;
1973                         goto error;
1974                 }
1975
1976                 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1977                 if (IS_ERR(inode)) {
1978                         err = PTR_ERR(inode);
1979                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1980                                 err);
1981                         goto error;
1982                 }
1983                 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
1984                 d_instantiate(dentry, inode);
1985                 err = v9fs_fid_add(dentry, fid);
1986                 if (err < 0)
1987                         goto error;
1988                 fid = NULL;
1989         } else {
1990                 /*
1991                  * Not in cached mode. No need to populate inode with stat.
1992                  * socket syscall returns a fd, so we need instantiate
1993                  */
1994                 inode = v9fs_get_inode(dir->i_sb, mode);
1995                 if (IS_ERR(inode)) {
1996                         err = PTR_ERR(inode);
1997                         goto error;
1998                 }
1999                 d_set_d_op(dentry, &v9fs_dentry_operations);
2000                 d_instantiate(dentry, inode);
2001         }
2002         /* Now set the ACL based on the default value */
2003         v9fs_set_create_acl(dentry, dacl, pacl);
2004 error:
2005         if (fid)
2006                 p9_client_clunk(fid);
2007         return err;
2008 }
2009
2010 static int
2011 v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen)
2012 {
2013         int retval;
2014         struct p9_fid *fid;
2015         char *target = NULL;
2016
2017         P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
2018         retval = -EPERM;
2019         fid = v9fs_fid_lookup(dentry);
2020         if (IS_ERR(fid))
2021                 return PTR_ERR(fid);
2022
2023         retval = p9_client_readlink(fid, &target);
2024         if (retval < 0)
2025                 return retval;
2026
2027         strncpy(buffer, target, buflen);
2028         P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer);
2029
2030         retval = strnlen(buffer, buflen);
2031         return retval;
2032 }
2033
2034 /**
2035  * v9fs_vfs_follow_link_dotl - follow a symlink path
2036  * @dentry: dentry for symlink
2037  * @nd: nameidata
2038  *
2039  */
2040
2041 static void *
2042 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
2043 {
2044         int len = 0;
2045         char *link = __getname();
2046
2047         P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
2048
2049         if (!link)
2050                 link = ERR_PTR(-ENOMEM);
2051         else {
2052                 len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX);
2053                 if (len < 0) {
2054                         __putname(link);
2055                         link = ERR_PTR(len);
2056                 } else
2057                         link[min(len, PATH_MAX-1)] = 0;
2058         }
2059         nd_set_link(nd, link);
2060
2061         return NULL;
2062 }
2063
2064 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
2065         .create = v9fs_vfs_create,
2066         .lookup = v9fs_vfs_lookup,
2067         .symlink = v9fs_vfs_symlink,
2068         .link = v9fs_vfs_link,
2069         .unlink = v9fs_vfs_unlink,
2070         .mkdir = v9fs_vfs_mkdir,
2071         .rmdir = v9fs_vfs_rmdir,
2072         .mknod = v9fs_vfs_mknod,
2073         .rename = v9fs_vfs_rename,
2074         .getattr = v9fs_vfs_getattr,
2075         .setattr = v9fs_vfs_setattr,
2076 };
2077
2078 static const struct inode_operations v9fs_dir_inode_operations_dotl = {
2079         .create = v9fs_vfs_create_dotl,
2080         .lookup = v9fs_vfs_lookup,
2081         .link = v9fs_vfs_link_dotl,
2082         .symlink = v9fs_vfs_symlink_dotl,
2083         .unlink = v9fs_vfs_unlink,
2084         .mkdir = v9fs_vfs_mkdir_dotl,
2085         .rmdir = v9fs_vfs_rmdir,
2086         .mknod = v9fs_vfs_mknod_dotl,
2087         .rename = v9fs_vfs_rename,
2088         .getattr = v9fs_vfs_getattr_dotl,
2089         .setattr = v9fs_vfs_setattr_dotl,
2090         .setxattr = generic_setxattr,
2091         .getxattr = generic_getxattr,
2092         .removexattr = generic_removexattr,
2093         .listxattr = v9fs_listxattr,
2094         .check_acl = v9fs_check_acl,
2095 };
2096
2097 static const struct inode_operations v9fs_dir_inode_operations = {
2098         .create = v9fs_vfs_create,
2099         .lookup = v9fs_vfs_lookup,
2100         .unlink = v9fs_vfs_unlink,
2101         .mkdir = v9fs_vfs_mkdir,
2102         .rmdir = v9fs_vfs_rmdir,
2103         .mknod = v9fs_vfs_mknod,
2104         .rename = v9fs_vfs_rename,
2105         .getattr = v9fs_vfs_getattr,
2106         .setattr = v9fs_vfs_setattr,
2107 };
2108
2109 static const struct inode_operations v9fs_file_inode_operations = {
2110         .getattr = v9fs_vfs_getattr,
2111         .setattr = v9fs_vfs_setattr,
2112 };
2113
2114 static const struct inode_operations v9fs_file_inode_operations_dotl = {
2115         .getattr = v9fs_vfs_getattr_dotl,
2116         .setattr = v9fs_vfs_setattr_dotl,
2117         .setxattr = generic_setxattr,
2118         .getxattr = generic_getxattr,
2119         .removexattr = generic_removexattr,
2120         .listxattr = v9fs_listxattr,
2121         .check_acl = v9fs_check_acl,
2122 };
2123
2124 static const struct inode_operations v9fs_symlink_inode_operations = {
2125         .readlink = generic_readlink,
2126         .follow_link = v9fs_vfs_follow_link,
2127         .put_link = v9fs_vfs_put_link,
2128         .getattr = v9fs_vfs_getattr,
2129         .setattr = v9fs_vfs_setattr,
2130 };
2131
2132 static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
2133         .readlink = v9fs_vfs_readlink_dotl,
2134         .follow_link = v9fs_vfs_follow_link_dotl,
2135         .put_link = v9fs_vfs_put_link,
2136         .getattr = v9fs_vfs_getattr_dotl,
2137         .setattr = v9fs_vfs_setattr_dotl,
2138         .setxattr = generic_setxattr,
2139         .getxattr = generic_getxattr,
2140         .removexattr = generic_removexattr,
2141         .listxattr = v9fs_listxattr,
2142 };