fs/reiserfs/xattr.c

   1 /*
   2  * linux/fs/reiserfs/xattr.c
   3  *
   4  * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com>
   5  *
   6  */
   7
   8 /*
   9  * In order to implement EA/ACLs in a clean, backwards compatible manner,
  10  * they are implemented as files in a "private" directory.
  11  * Each EA is in it's own file, with the directory layout like so (/ is assumed
  12  * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory,
  13  * directories named using the capital-hex form of the objectid and
  14  * generation number are used. Inside each directory are individual files
  15  * named with the name of the extended attribute.
  16  *
  17  * So, for objectid 12648430, we could have:
  18  * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access
  19  * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default
  20  * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type
  21  * .. or similar.
  22  *
  23  * The file contents are the text of the EA. The size is known based on the
  24  * stat data describing the file.
  25  *
  26  * In the case of system.posix_acl_access and system.posix_acl_default, since
  27  * these are special cases for filesystem ACLs, they are interpreted by the
  28  * kernel, in addition, they are negatively and positively cached and attached
  29  * to the inode so that unnecessary lookups are avoided.
  30  */
  31
  32 #include <linux/reiserfs_fs.h>
  33 #include <linux/capability.h>
  34 #include <linux/dcache.h>
  35 #include <linux/namei.h>
  36 #include <linux/errno.h>
  37 #include <linux/fs.h>
  38 #include <linux/file.h>
  39 #include <linux/pagemap.h>
  40 #include <linux/xattr.h>
  41 #include <linux/reiserfs_xattr.h>
  42 #include <linux/reiserfs_acl.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/checksum.h>
  45 #include <linux/smp_lock.h>
  46 #include <linux/stat.h>
  47 #include <asm/semaphore.h>
  48
  49 #define FL_READONLY 128
  50 #define FL_DIR_SEM_HELD 256
  51 #define PRIVROOT_NAME ".reiserfs_priv"
  52 #define XAROOT_NAME   "xattrs"
  53
  54 static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
  55                                                                 *prefix);
  56
  57 static struct dentry *create_xa_root(struct super_block *sb)
  58 {
  59         struct dentry *privroot = dget(REISERFS_SB(sb)->priv_root);
  60         struct dentry *xaroot;
  61
  62         /* This needs to be created at mount-time */
  63         if (!privroot)
  64                 return ERR_PTR(-EOPNOTSUPP);
  65
  66         xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME));
  67         if (IS_ERR(xaroot)) {
  68                 goto out;
  69         } else if (!xaroot->d_inode) {
  70                 int err;
  71                 mutex_lock(&privroot->d_inode->i_mutex);
  72                 err =
  73                     privroot->d_inode->i_op->mkdir(privroot->d_inode, xaroot,
  74                                                    0700);
  75                 mutex_unlock(&privroot->d_inode->i_mutex);
  76
  77                 if (err) {
  78                         dput(xaroot);
  79                         dput(privroot);
  80                         return ERR_PTR(err);
  81                 }
  82                 REISERFS_SB(sb)->xattr_root = dget(xaroot);
  83         }
  84
  85       out:
  86         dput(privroot);
  87         return xaroot;
  88 }
  89
  90 /* This will return a dentry, or error, refering to the xa root directory.
  91  * If the xa root doesn't exist yet, the dentry will be returned without
  92  * an associated inode. This dentry can be used with ->mkdir to create
  93  * the xa directory. */
  94 static struct dentry *__get_xa_root(struct super_block *s)
  95 {
  96         struct dentry *privroot = dget(REISERFS_SB(s)->priv_root);
  97         struct dentry *xaroot = NULL;
  98
  99         if (IS_ERR(privroot) || !privroot)
 100                 return privroot;
 101
 102         xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME));
 103         if (IS_ERR(xaroot)) {
 104                 goto out;
 105         } else if (!xaroot->d_inode) {
 106                 dput(xaroot);
 107                 xaroot = NULL;
 108                 goto out;
 109         }
 110
 111         REISERFS_SB(s)->xattr_root = dget(xaroot);
 112
 113       out:
 114         dput(privroot);
 115         return xaroot;
 116 }
 117
 118 /* Returns the dentry (or NULL) referring to the root of the extended
 119  * attribute directory tree. If it has already been retrieved, it is used.
 120  * Otherwise, we attempt to retrieve it from disk. It may also return
 121  * a pointer-encoded error.
 122  */
 123 static inline struct dentry *get_xa_root(struct super_block *s)
 124 {
 125         struct dentry *dentry = dget(REISERFS_SB(s)->xattr_root);
 126
 127         if (!dentry)
 128                 dentry = __get_xa_root(s);
 129
 130         return dentry;
 131 }
 132
 133 /* Opens the directory corresponding to the inode's extended attribute store.
 134  * If flags allow, the tree to the directory may be created. If creation is
 135  * prohibited, -ENODATA is returned. */
 136 static struct dentry *open_xa_dir(const struct inode *inode, int flags)
 137 {
 138         struct dentry *xaroot, *xadir;
 139         char namebuf[17];
 140
 141         xaroot = get_xa_root(inode->i_sb);
 142         if (IS_ERR(xaroot)) {
 143                 return xaroot;
 144         } else if (!xaroot) {
 145                 if (flags == 0 || flags & XATTR_CREATE) {
 146                         xaroot = create_xa_root(inode->i_sb);
 147                         if (IS_ERR(xaroot))
 148                                 return xaroot;
 149                 }
 150                 if (!xaroot)
 151                         return ERR_PTR(-ENODATA);
 152         }
 153
 154         /* ok, we have xaroot open */
 155
 156         snprintf(namebuf, sizeof(namebuf), "%X.%X",
 157                  le32_to_cpu(INODE_PKEY(inode)->k_objectid),
 158                  inode->i_generation);
 159         xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
 160         if (IS_ERR(xadir)) {
 161                 dput(xaroot);
 162                 return xadir;
 163         }
 164
 165         if (!xadir->d_inode) {
 166                 int err;
 167                 if (flags == 0 || flags & XATTR_CREATE) {
 168                         /* Although there is nothing else trying to create this directory,
 169                          * another directory with the same hash may be created, so we need
 170                          * to protect against that */
 171                         err =
 172                             xaroot->d_inode->i_op->mkdir(xaroot->d_inode, xadir,
 173                                                          0700);
 174                         if (err) {
 175                                 dput(xaroot);
 176                                 dput(xadir);
 177                                 return ERR_PTR(err);
 178                         }
 179                 }
 180                 if (!xadir->d_inode) {
 181                         dput(xaroot);
 182                         dput(xadir);
 183                         return ERR_PTR(-ENODATA);
 184                 }
 185         }
 186
 187         dput(xaroot);
 188         return xadir;
 189 }
 190
 191 /* Returns a dentry corresponding to a specific extended attribute file
 192  * for the inode. If flags allow, the file is created. Otherwise, a
 193  * valid or negative dentry, or an error is returned. */
 194 static struct dentry *get_xa_file_dentry(const struct inode *inode,
 195                                          const char *name, int flags)
 196 {
 197         struct dentry *xadir, *xafile;
 198         int err = 0;
 199
 200         xadir = open_xa_dir(inode, flags);
 201         if (IS_ERR(xadir)) {
 202                 return ERR_PTR(PTR_ERR(xadir));
 203         } else if (xadir && !xadir->d_inode) {
 204                 dput(xadir);
 205                 return ERR_PTR(-ENODATA);
 206         }
 207
 208         xafile = lookup_one_len(name, xadir, strlen(name));
 209         if (IS_ERR(xafile)) {
 210                 dput(xadir);
 211                 return ERR_PTR(PTR_ERR(xafile));
 212         }
 213
 214         if (xafile->d_inode) {  /* file exists */
 215                 if (flags & XATTR_CREATE) {
 216                         err = -EEXIST;
 217                         dput(xafile);
 218                         goto out;
 219                 }
 220         } else if (flags & XATTR_REPLACE || flags & FL_READONLY) {
 221                 goto out;
 222         } else {
 223                 /* inode->i_mutex is down, so nothing else can try to create
 224                  * the same xattr */
 225                 err = xadir->d_inode->i_op->create(xadir->d_inode, xafile,
 226                                                    0700 | S_IFREG, NULL);
 227
 228                 if (err) {
 229                         dput(xafile);
 230                         goto out;
 231                 }
 232         }
 233
 234       out:
 235         dput(xadir);
 236         if (err)
 237                 xafile = ERR_PTR(err);
 238         return xafile;
 239 }
 240
 241 /* Opens a file pointer to the attribute associated with inode */
 242 static struct file *open_xa_file(const struct inode *inode, const char *name,
 243                                  int flags)
 244 {
 245         struct dentry *xafile;
 246         struct file *fp;
 247
 248         xafile = get_xa_file_dentry(inode, name, flags);
 249         if (IS_ERR(xafile))
 250                 return ERR_PTR(PTR_ERR(xafile));
 251         else if (!xafile->d_inode) {
 252                 dput(xafile);
 253                 return ERR_PTR(-ENODATA);
 254         }
 255
 256         fp = dentry_open(xafile, NULL, O_RDWR);
 257         /* dentry_open dputs the dentry if it fails */
 258
 259         return fp;
 260 }
 261
 262 /*
 263  * this is very similar to fs/reiserfs/dir.c:reiserfs_readdir, but
 264  * we need to drop the path before calling the filldir struct.  That
 265  * would be a big performance hit to the non-xattr case, so I've copied
 266  * the whole thing for now. --clm
 267  *
 268  * the big difference is that I go backwards through the directory,
 269  * and don't mess with f->f_pos, but the idea is the same.  Do some
 270  * action on each and every entry in the directory.
 271  *
 272  * we're called with i_mutex held, so there are no worries about the directory
 273  * changing underneath us.
 274  */
 275 static int __xattr_readdir(struct file *filp, void *dirent, filldir_t filldir)
 276 {
 277         struct inode *inode = filp->f_dentry->d_inode;
 278         struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
 279         INITIALIZE_PATH(path_to_entry);
 280         struct buffer_head *bh;
 281         int entry_num;
 282         struct item_head *ih, tmp_ih;
 283         int search_res;
 284         char *local_buf;
 285         loff_t next_pos;
 286         char small_buf[32];     /* avoid kmalloc if we can */
 287         struct reiserfs_de_head *deh;
 288         int d_reclen;
 289         char *d_name;
 290         off_t d_off;
 291         ino_t d_ino;
 292         struct reiserfs_dir_entry de;
 293
 294         /* form key for search the next directory entry using f_pos field of
 295            file structure */
 296         next_pos = max_reiserfs_offset(inode);
 297
 298         while (1) {
 299               research:
 300                 if (next_pos <= DOT_DOT_OFFSET)
 301                         break;
 302                 make_cpu_key(&pos_key, inode, next_pos, TYPE_DIRENTRY, 3);
 303
 304                 search_res =
 305                     search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
 306                                         &de);
 307                 if (search_res == IO_ERROR) {
 308                         // FIXME: we could just skip part of directory which could
 309                         // not be read
 310                         pathrelse(&path_to_entry);
 311                         return -EIO;
 312                 }
 313
 314                 if (search_res == NAME_NOT_FOUND)
 315                         de.de_entry_num--;
 316
 317                 set_de_name_and_namelen(&de);
 318                 entry_num = de.de_entry_num;
 319                 deh = &(de.de_deh[entry_num]);
 320
 321                 bh = de.de_bh;
 322                 ih = de.de_ih;
 323
 324                 if (!is_direntry_le_ih(ih)) {
 325                         reiserfs_warning(inode->i_sb, "not direntry %h", ih);
 326                         break;
 327                 }
 328                 copy_item_head(&tmp_ih, ih);
 329
 330                 /* we must have found item, that is item of this directory, */
 331                 RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key),
 332                        "vs-9000: found item %h does not match to dir we readdir %K",
 333                        ih, &pos_key);
 334
 335                 if (deh_offset(deh) <= DOT_DOT_OFFSET) {
 336                         break;
 337                 }
 338
 339                 /* look for the previous entry in the directory */
 340                 next_pos = deh_offset(deh) - 1;
 341
 342                 if (!de_visible(deh))
 343                         /* it is hidden entry */
 344                         continue;
 345
 346                 d_reclen = entry_length(bh, ih, entry_num);
 347                 d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
 348                 d_off = deh_offset(deh);
 349                 d_ino = deh_objectid(deh);
 350
 351                 if (!d_name[d_reclen - 1])
 352                         d_reclen = strlen(d_name);
 353
 354                 if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)) {
 355                         /* too big to send back to VFS */
 356                         continue;
 357                 }
 358
 359                 /* Ignore the .reiserfs_priv entry */
 360                 if (reiserfs_xattrs(inode->i_sb) &&
 361                     !old_format_only(inode->i_sb) &&
 362                     deh_objectid(deh) ==
 363                     le32_to_cpu(INODE_PKEY
 364                                 (REISERFS_SB(inode->i_sb)->priv_root->d_inode)->
 365                                 k_objectid))
 366                         continue;
 367
 368                 if (d_reclen <= 32) {
 369                         local_buf = small_buf;
 370                 } else {
 371                         local_buf = kmalloc(d_reclen, GFP_NOFS);
 372                         if (!local_buf) {
 373                                 pathrelse(&path_to_entry);
 374                                 return -ENOMEM;
 375                         }
 376                         if (item_moved(&tmp_ih, &path_to_entry)) {
 377                                 kfree(local_buf);
 378
 379                                 /* sigh, must retry.  Do this same offset again */
 380                                 next_pos = d_off;
 381                                 goto research;
 382                         }
 383                 }
 384
 385                 // Note, that we copy name to user space via temporary
 386                 // buffer (local_buf) because filldir will block if
 387                 // user space buffer is swapped out. At that time
 388                 // entry can move to somewhere else
 389                 memcpy(local_buf, d_name, d_reclen);
 390
 391                 /* the filldir function might need to start transactions,
 392                  * or do who knows what.  Release the path now that we've
 393                  * copied all the important stuff out of the deh
 394                  */
 395                 pathrelse(&path_to_entry);
 396
 397                 if (filldir(dirent, local_buf, d_reclen, d_off, d_ino,
 398                             DT_UNKNOWN) < 0) {
 399                         if (local_buf != small_buf) {
 400                                 kfree(local_buf);
 401                         }
 402                         goto end;
 403                 }
 404                 if (local_buf != small_buf) {
 405                         kfree(local_buf);
 406                 }
 407         }                       /* while */
 408
 409       end:
 410         pathrelse(&path_to_entry);
 411         return 0;
 412 }
 413
 414 /*
 415  * this could be done with dedicated readdir ops for the xattr files,
 416  * but I want to get something working asap
 417  * this is stolen from vfs_readdir
 418  *
 419  */
 420 static
 421 int xattr_readdir(struct file *file, filldir_t filler, void *buf)
 422 {
 423         struct inode *inode = file->f_dentry->d_inode;
 424         int res = -ENOTDIR;
 425         if (!file->f_op || !file->f_op->readdir)
 426                 goto out;
 427         mutex_lock(&inode->i_mutex);
 428 //        down(&inode->i_zombie);
 429         res = -ENOENT;
 430         if (!IS_DEADDIR(inode)) {
 431                 lock_kernel();
 432                 res = __xattr_readdir(file, buf, filler);
 433                 unlock_kernel();
 434         }
 435 //        up(&inode->i_zombie);
 436         mutex_unlock(&inode->i_mutex);
 437       out:
 438         return res;
 439 }
 440
 441 /* Internal operations on file data */
 442 static inline void reiserfs_put_page(struct page *page)
 443 {
 444         kunmap(page);
 445         page_cache_release(page);
 446 }
 447
 448 static struct page *reiserfs_get_page(struct inode *dir, unsigned long n)
 449 {
 450         struct address_space *mapping = dir->i_mapping;
 451         struct page *page;
 452         /* We can deadlock if we try to free dentries,
 453            and an unlink/rmdir has just occured - GFP_NOFS avoids this */
 454         mapping_set_gfp_mask(mapping, GFP_NOFS);
 455         page = read_cache_page(mapping, n,
 456                                (filler_t *) mapping->a_ops->readpage, NULL);
 457         if (!IS_ERR(page)) {
 458                 wait_on_page_locked(page);
 459                 kmap(page);
 460                 if (!PageUptodate(page))
 461                         goto fail;
 462
 463                 if (PageError(page))
 464                         goto fail;
 465         }
 466         return page;
 467
 468       fail:
 469         reiserfs_put_page(page);
 470         return ERR_PTR(-EIO);
 471 }
 472
 473 static inline __u32 xattr_hash(const char *msg, int len)
 474 {
 475         return csum_partial(msg, len, 0);
 476 }
 477
 478 /* Generic extended attribute operations that can be used by xa plugins */
 479
 480 /*
 481  * inode->i_mutex: down
 482  */
 483 int
 484 reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
 485                    size_t buffer_size, int flags)
 486 {
 487         int err = 0;
 488         struct file *fp;
 489         struct page *page;
 490         char *data;
 491         struct address_space *mapping;
 492         size_t file_pos = 0;
 493         size_t buffer_pos = 0;
 494         struct inode *xinode;
 495         struct iattr newattrs;
 496         __u32 xahash = 0;
 497
 498         if (get_inode_sd_version(inode) == STAT_DATA_V1)
 499                 return -EOPNOTSUPP;
 500
 501         /* Empty xattrs are ok, they're just empty files, no hash */
 502         if (buffer && buffer_size)
 503                 xahash = xattr_hash(buffer, buffer_size);
 504
 505       open_file:
 506         fp = open_xa_file(inode, name, flags);
 507         if (IS_ERR(fp)) {
 508                 err = PTR_ERR(fp);
 509                 goto out;
 510         }
 511
 512         xinode = fp->f_dentry->d_inode;
 513         REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
 514
 515         /* we need to copy it off.. */
 516         if (xinode->i_nlink > 1) {
 517                 fput(fp);
 518                 err = reiserfs_xattr_del(inode, name);
 519                 if (err < 0)
 520                         goto out;
 521                 /* We just killed the old one, we're not replacing anymore */
 522                 if (flags & XATTR_REPLACE)
 523                         flags &= ~XATTR_REPLACE;
 524                 goto open_file;
 525         }
 526
 527         /* Resize it so we're ok to write there */
 528         newattrs.ia_size = buffer_size;
 529         newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
 530         mutex_lock(&xinode->i_mutex);
 531         err = notify_change(fp->f_dentry, &newattrs);
 532         if (err)
 533                 goto out_filp;
 534
 535         mapping = xinode->i_mapping;
 536         while (buffer_pos < buffer_size || buffer_pos == 0) {
 537                 size_t chunk;
 538                 size_t skip = 0;
 539                 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
 540                 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
 541                         chunk = PAGE_CACHE_SIZE;
 542                 else
 543                         chunk = buffer_size - buffer_pos;
 544
 545                 page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT);
 546                 if (IS_ERR(page)) {
 547                         err = PTR_ERR(page);
 548                         goto out_filp;
 549                 }
 550
 551                 lock_page(page);
 552                 data = page_address(page);
 553
 554                 if (file_pos == 0) {
 555                         struct reiserfs_xattr_header *rxh;
 556                         skip = file_pos = sizeof(struct reiserfs_xattr_header);
 557                         if (chunk + skip > PAGE_CACHE_SIZE)
 558                                 chunk = PAGE_CACHE_SIZE - skip;
 559                         rxh = (struct reiserfs_xattr_header *)data;
 560                         rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
 561                         rxh->h_hash = cpu_to_le32(xahash);
 562                 }
 563
 564                 err = mapping->a_ops->prepare_write(fp, page, page_offset,
 565                                                     page_offset + chunk + skip);
 566                 if (!err) {
 567                         if (buffer)
 568                                 memcpy(data + skip, buffer + buffer_pos, chunk);
 569                         err =
 570                             mapping->a_ops->commit_write(fp, page, page_offset,
 571                                                          page_offset + chunk +
 572                                                          skip);
 573                 }
 574                 unlock_page(page);
 575                 reiserfs_put_page(page);
 576                 buffer_pos += chunk;
 577                 file_pos += chunk;
 578                 skip = 0;
 579                 if (err || buffer_size == 0 || !buffer)
 580                         break;
 581         }
 582
 583         /* We can't mark the inode dirty if it's not hashed. This is the case
 584          * when we're inheriting the default ACL. If we dirty it, the inode
 585          * gets marked dirty, but won't (ever) make it onto the dirty list until
 586          * it's synced explicitly to clear I_DIRTY. This is bad. */
 587         if (!hlist_unhashed(&inode->i_hash)) {
 588                 inode->i_ctime = CURRENT_TIME_SEC;
 589                 mark_inode_dirty(inode);
 590         }
 591
 592       out_filp:
 593         mutex_unlock(&xinode->i_mutex);
 594         fput(fp);
 595
 596       out:
 597         return err;
 598 }
 599
 600 /*
 601  * inode->i_mutex: down
 602  */
 603 int
 604 reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
 605                    size_t buffer_size)
 606 {
 607         ssize_t err = 0;
 608         struct file *fp;
 609         size_t isize;
 610         size_t file_pos = 0;
 611         size_t buffer_pos = 0;
 612         struct page *page;
 613         struct inode *xinode;
 614         __u32 hash = 0;
 615
 616         if (name == NULL)
 617                 return -EINVAL;
 618
 619         /* We can't have xattrs attached to v1 items since they don't have
 620          * generation numbers */
 621         if (get_inode_sd_version(inode) == STAT_DATA_V1)
 622                 return -EOPNOTSUPP;
 623
 624         fp = open_xa_file(inode, name, FL_READONLY);
 625         if (IS_ERR(fp)) {
 626                 err = PTR_ERR(fp);
 627                 goto out;
 628         }
 629
 630         xinode = fp->f_dentry->d_inode;
 631         isize = xinode->i_size;
 632         REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
 633
 634         /* Just return the size needed */
 635         if (buffer == NULL) {
 636                 err = isize - sizeof(struct reiserfs_xattr_header);
 637                 goto out_dput;
 638         }
 639
 640         if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
 641                 err = -ERANGE;
 642                 goto out_dput;
 643         }
 644
 645         while (file_pos < isize) {
 646                 size_t chunk;
 647                 char *data;
 648                 size_t skip = 0;
 649                 if (isize - file_pos > PAGE_CACHE_SIZE)
 650                         chunk = PAGE_CACHE_SIZE;
 651                 else
 652                         chunk = isize - file_pos;
 653
 654                 page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT);
 655                 if (IS_ERR(page)) {
 656                         err = PTR_ERR(page);
 657                         goto out_dput;
 658                 }
 659
 660                 lock_page(page);
 661                 data = page_address(page);
 662                 if (file_pos == 0) {
 663                         struct reiserfs_xattr_header *rxh =
 664                             (struct reiserfs_xattr_header *)data;
 665                         skip = file_pos = sizeof(struct reiserfs_xattr_header);
 666                         chunk -= skip;
 667                         /* Magic doesn't match up.. */
 668                         if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
 669                                 unlock_page(page);
 670                                 reiserfs_put_page(page);
 671                                 reiserfs_warning(inode->i_sb,
 672                                                  "Invalid magic for xattr (%s) "
 673                                                  "associated with %k", name,
 674                                                  INODE_PKEY(inode));
 675                                 err = -EIO;
 676                                 goto out_dput;
 677                         }
 678                         hash = le32_to_cpu(rxh->h_hash);
 679                 }
 680                 memcpy(buffer + buffer_pos, data + skip, chunk);
 681                 unlock_page(page);
 682                 reiserfs_put_page(page);
 683                 file_pos += chunk;
 684                 buffer_pos += chunk;
 685                 skip = 0;
 686         }
 687         err = isize - sizeof(struct reiserfs_xattr_header);
 688
 689         if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
 690             hash) {
 691                 reiserfs_warning(inode->i_sb,
 692                                  "Invalid hash for xattr (%s) associated "
 693                                  "with %k", name, INODE_PKEY(inode));
 694                 err = -EIO;
 695         }
 696
 697       out_dput:
 698         fput(fp);
 699
 700       out:
 701         return err;
 702 }
 703
 704 static int
 705 __reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen)
 706 {
 707         struct dentry *dentry;
 708         struct inode *dir = xadir->d_inode;
 709         int err = 0;
 710
 711         dentry = lookup_one_len(name, xadir, namelen);
 712         if (IS_ERR(dentry)) {
 713                 err = PTR_ERR(dentry);
 714                 goto out;
 715         } else if (!dentry->d_inode) {
 716                 err = -ENODATA;
 717                 goto out_file;
 718         }
 719
 720         /* Skip directories.. */
 721         if (S_ISDIR(dentry->d_inode->i_mode))
 722                 goto out_file;
 723
 724         if (!is_reiserfs_priv_object(dentry->d_inode)) {
 725                 reiserfs_warning(dir->i_sb, "OID %08x [%.*s/%.*s] doesn't have "
 726                                  "priv flag set [parent is %sset].",
 727                                  le32_to_cpu(INODE_PKEY(dentry->d_inode)->
 728                                              k_objectid), xadir->d_name.len,
 729                                  xadir->d_name.name, namelen, name,
 730                                  is_reiserfs_priv_object(xadir->
 731                                                          d_inode) ? "" :
 732                                  "not ");
 733                 dput(dentry);
 734                 return -EIO;
 735         }
 736
 737         err = dir->i_op->unlink(dir, dentry);
 738         if (!err)
 739                 d_delete(dentry);
 740
 741       out_file:
 742         dput(dentry);
 743
 744       out:
 745         return err;
 746 }
 747
 748 int reiserfs_xattr_del(struct inode *inode, const char *name)
 749 {
 750         struct dentry *dir;
 751         int err;
 752
 753         dir = open_xa_dir(inode, FL_READONLY);
 754         if (IS_ERR(dir)) {
 755                 err = PTR_ERR(dir);
 756                 goto out;
 757         }
 758
 759         err = __reiserfs_xattr_del(dir, name, strlen(name));
 760         dput(dir);
 761
 762         if (!err) {
 763                 inode->i_ctime = CURRENT_TIME_SEC;
 764                 mark_inode_dirty(inode);
 765         }
 766
 767       out:
 768         return err;
 769 }
 770
 771 /* The following are side effects of other operations that aren't explicitly
 772  * modifying extended attributes. This includes operations such as permissions
 773  * or ownership changes, object deletions, etc. */
 774
 775 static int
 776 reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
 777                               loff_t offset, ino_t ino, unsigned int d_type)
 778 {
 779         struct dentry *xadir = (struct dentry *)buf;
 780
 781         return __reiserfs_xattr_del(xadir, name, namelen);
 782
 783 }
 784
 785 /* This is called w/ inode->i_mutex downed */
 786 int reiserfs_delete_xattrs(struct inode *inode)
 787 {
 788         struct file *fp;
 789         struct dentry *dir, *root;
 790         int err = 0;
 791
 792         /* Skip out, an xattr has no xattrs associated with it */
 793         if (is_reiserfs_priv_object(inode) ||
 794             get_inode_sd_version(inode) == STAT_DATA_V1 ||
 795             !reiserfs_xattrs(inode->i_sb)) {
 796                 return 0;
 797         }
 798         reiserfs_read_lock_xattrs(inode->i_sb);
 799         dir = open_xa_dir(inode, FL_READONLY);
 800         reiserfs_read_unlock_xattrs(inode->i_sb);
 801         if (IS_ERR(dir)) {
 802                 err = PTR_ERR(dir);
 803                 goto out;
 804         } else if (!dir->d_inode) {
 805                 dput(dir);
 806                 return 0;
 807         }
 808
 809         fp = dentry_open(dir, NULL, O_RDWR);
 810         if (IS_ERR(fp)) {
 811                 err = PTR_ERR(fp);
 812                 /* dentry_open dputs the dentry if it fails */
 813                 goto out;
 814         }
 815
 816         lock_kernel();
 817         err = xattr_readdir(fp, reiserfs_delete_xattrs_filler, dir);
 818         if (err) {
 819                 unlock_kernel();
 820                 goto out_dir;
 821         }
 822
 823         /* Leftovers besides . and .. -- that's not good. */
 824         if (dir->d_inode->i_nlink <= 2) {
 825                 root = get_xa_root(inode->i_sb);
 826                 reiserfs_write_lock_xattrs(inode->i_sb);
 827                 err = vfs_rmdir(root->d_inode, dir);
 828                 reiserfs_write_unlock_xattrs(inode->i_sb);
 829                 dput(root);
 830         } else {
 831                 reiserfs_warning(inode->i_sb,
 832                                  "Couldn't remove all entries in directory");
 833         }
 834         unlock_kernel();
 835
 836       out_dir:
 837         fput(fp);
 838
 839       out:
 840         if (!err)
 841                 REISERFS_I(inode)->i_flags =
 842                     REISERFS_I(inode)->i_flags & ~i_has_xattr_dir;
 843         return err;
 844 }
 845
 846 struct reiserfs_chown_buf {
 847         struct inode *inode;
 848         struct dentry *xadir;
 849         struct iattr *attrs;
 850 };
 851
 852 /* XXX: If there is a better way to do this, I'd love to hear about it */
 853 static int
 854 reiserfs_chown_xattrs_filler(void *buf, const char *name, int namelen,
 855                              loff_t offset, ino_t ino, unsigned int d_type)
 856 {
 857         struct reiserfs_chown_buf *chown_buf = (struct reiserfs_chown_buf *)buf;
 858         struct dentry *xafile, *xadir = chown_buf->xadir;
 859         struct iattr *attrs = chown_buf->attrs;
 860         int err = 0;
 861
 862         xafile = lookup_one_len(name, xadir, namelen);
 863         if (IS_ERR(xafile))
 864                 return PTR_ERR(xafile);
 865         else if (!xafile->d_inode) {
 866                 dput(xafile);
 867                 return -ENODATA;
 868         }
 869
 870         if (!S_ISDIR(xafile->d_inode->i_mode))
 871                 err = notify_change(xafile, attrs);
 872         dput(xafile);
 873
 874         return err;
 875 }
 876
 877 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
 878 {
 879         struct file *fp;
 880         struct dentry *dir;
 881         int err = 0;
 882         struct reiserfs_chown_buf buf;
 883         unsigned int ia_valid = attrs->ia_valid;
 884
 885         /* Skip out, an xattr has no xattrs associated with it */
 886         if (is_reiserfs_priv_object(inode) ||
 887             get_inode_sd_version(inode) == STAT_DATA_V1 ||
 888             !reiserfs_xattrs(inode->i_sb)) {
 889                 return 0;
 890         }
 891         reiserfs_read_lock_xattrs(inode->i_sb);
 892         dir = open_xa_dir(inode, FL_READONLY);
 893         reiserfs_read_unlock_xattrs(inode->i_sb);
 894         if (IS_ERR(dir)) {
 895                 if (PTR_ERR(dir) != -ENODATA)
 896                         err = PTR_ERR(dir);
 897                 goto out;
 898         } else if (!dir->d_inode) {
 899                 dput(dir);
 900                 goto out;
 901         }
 902
 903         fp = dentry_open(dir, NULL, O_RDWR);
 904         if (IS_ERR(fp)) {
 905                 err = PTR_ERR(fp);
 906                 /* dentry_open dputs the dentry if it fails */
 907                 goto out;
 908         }
 909
 910         lock_kernel();
 911
 912         attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME);
 913         buf.xadir = dir;
 914         buf.attrs = attrs;
 915         buf.inode = inode;
 916
 917         err = xattr_readdir(fp, reiserfs_chown_xattrs_filler, &buf);
 918         if (err) {
 919                 unlock_kernel();
 920                 goto out_dir;
 921         }
 922
 923         err = notify_change(dir, attrs);
 924         unlock_kernel();
 925
 926       out_dir:
 927         fput(fp);
 928
 929       out:
 930         attrs->ia_valid = ia_valid;
 931         return err;
 932 }
 933
 934 /* Actual operations that are exported to VFS-land */
 935
 936 /*
 937  * Inode operation getxattr()
 938  * Preliminary locking: we down dentry->d_inode->i_mutex
 939  */
 940 ssize_t
 941 reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
 942                   size_t size)
 943 {
 944         struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
 945         int err;
 946
 947         if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
 948             get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
 949                 return -EOPNOTSUPP;
 950
 951         reiserfs_read_lock_xattr_i(dentry->d_inode);
 952         reiserfs_read_lock_xattrs(dentry->d_sb);
 953         err = xah->get(dentry->d_inode, name, buffer, size);
 954         reiserfs_read_unlock_xattrs(dentry->d_sb);
 955         reiserfs_read_unlock_xattr_i(dentry->d_inode);
 956         return err;
 957 }
 958
 959 /*
 960  * Inode operation setxattr()
 961  *
 962  * dentry->d_inode->i_mutex down
 963  */
 964 int
 965 reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 966                   size_t size, int flags)
 967 {
 968         struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
 969         int err;
 970         int lock;
 971
 972         if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
 973             get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
 974                 return -EOPNOTSUPP;
 975
 976         reiserfs_write_lock_xattr_i(dentry->d_inode);
 977         lock = !has_xattr_dir(dentry->d_inode);
 978         if (lock)
 979                 reiserfs_write_lock_xattrs(dentry->d_sb);
 980         else
 981                 reiserfs_read_lock_xattrs(dentry->d_sb);
 982         err = xah->set(dentry->d_inode, name, value, size, flags);
 983         if (lock)
 984                 reiserfs_write_unlock_xattrs(dentry->d_sb);
 985         else
 986                 reiserfs_read_unlock_xattrs(dentry->d_sb);
 987         reiserfs_write_unlock_xattr_i(dentry->d_inode);
 988         return err;
 989 }
 990
 991 /*
 992  * Inode operation removexattr()
 993  *
 994  * dentry->d_inode->i_mutex down
 995  */
 996 int reiserfs_removexattr(struct dentry *dentry, const char *name)
 997 {
 998         int err;
 999         struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
1000
1001         if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
1002             get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
1003                 return -EOPNOTSUPP;
1004
1005         reiserfs_write_lock_xattr_i(dentry->d_inode);
1006         reiserfs_read_lock_xattrs(dentry->d_sb);
1007
1008         /* Deletion pre-operation */
1009         if (xah->del) {
1010                 err = xah->del(dentry->d_inode, name);
1011                 if (err)
1012                         goto out;
1013         }
1014
1015         err = reiserfs_xattr_del(dentry->d_inode, name);
1016
1017         dentry->d_inode->i_ctime = CURRENT_TIME_SEC;
1018         mark_inode_dirty(dentry->d_inode);
1019
1020       out:
1021         reiserfs_read_unlock_xattrs(dentry->d_sb);
1022         reiserfs_write_unlock_xattr_i(dentry->d_inode);
1023         return err;
1024 }
1025
1026 /* This is what filldir will use:
1027  * r_pos will always contain the amount of space required for the entire
1028  * list. If r_pos becomes larger than r_size, we need more space and we
1029  * return an error indicating this. If r_pos is less than r_size, then we've
1030  * filled the buffer successfully and we return success */
1031 struct reiserfs_listxattr_buf {
1032         int r_pos;
1033         int r_size;
1034         char *r_buf;
1035         struct inode *r_inode;
1036 };
1037
1038 static int
1039 reiserfs_listxattr_filler(void *buf, const char *name, int namelen,
1040                           loff_t offset, ino_t ino, unsigned int d_type)
1041 {
1042         struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf;
1043         int len = 0;
1044         if (name[0] != '.'
1045             || (namelen != 1 && (name[1] != '.' || namelen != 2))) {
1046                 struct reiserfs_xattr_handler *xah =
1047                     find_xattr_handler_prefix(name);
1048                 if (!xah)
1049                         return 0;       /* Unsupported xattr name, skip it */
1050
1051                 /* We call ->list() twice because the operation isn't required to just
1052                  * return the name back - we want to make sure we have enough space */
1053                 len += xah->list(b->r_inode, name, namelen, NULL);
1054
1055                 if (len) {
1056                         if (b->r_pos + len + 1 <= b->r_size) {
1057                                 char *p = b->r_buf + b->r_pos;
1058                                 p += xah->list(b->r_inode, name, namelen, p);
1059                                 *p++ = '\0';
1060                         }
1061                         b->r_pos += len + 1;
1062                 }
1063         }
1064
1065         return 0;
1066 }
1067
1068 /*
1069  * Inode operation listxattr()
1070  *
1071  * Preliminary locking: we down dentry->d_inode->i_mutex
1072  */
1073 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
1074 {
1075         struct file *fp;
1076         struct dentry *dir;
1077         int err = 0;
1078         struct reiserfs_listxattr_buf buf;
1079
1080         if (!dentry->d_inode)
1081                 return -EINVAL;
1082
1083         if (!reiserfs_xattrs(dentry->d_sb) ||
1084             get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
1085                 return -EOPNOTSUPP;
1086
1087         reiserfs_read_lock_xattr_i(dentry->d_inode);
1088         reiserfs_read_lock_xattrs(dentry->d_sb);
1089         dir = open_xa_dir(dentry->d_inode, FL_READONLY);
1090         reiserfs_read_unlock_xattrs(dentry->d_sb);
1091         if (IS_ERR(dir)) {
1092                 err = PTR_ERR(dir);
1093                 if (err == -ENODATA)
1094                         err = 0;        /* Not an error if there aren't any xattrs */
1095                 goto out;
1096         }
1097
1098         fp = dentry_open(dir, NULL, O_RDWR);
1099         if (IS_ERR(fp)) {
1100                 err = PTR_ERR(fp);
1101                 /* dentry_open dputs the dentry if it fails */
1102                 goto out;
1103         }
1104
1105         buf.r_buf = buffer;
1106         buf.r_size = buffer ? size : 0;
1107         buf.r_pos = 0;
1108         buf.r_inode = dentry->d_inode;
1109
1110         REISERFS_I(dentry->d_inode)->i_flags |= i_has_xattr_dir;
1111
1112         err = xattr_readdir(fp, reiserfs_listxattr_filler, &buf);
1113         if (err)
1114                 goto out_dir;
1115
1116         if (buf.r_pos > buf.r_size && buffer != NULL)
1117                 err = -ERANGE;
1118         else
1119                 err = buf.r_pos;
1120
1121       out_dir:
1122         fput(fp);
1123
1124       out:
1125         reiserfs_read_unlock_xattr_i(dentry->d_inode);
1126         return err;
1127 }
1128
1129 /* This is the implementation for the xattr plugin infrastructure */
1130 static struct list_head xattr_handlers = LIST_HEAD_INIT(xattr_handlers);
1131 static DEFINE_RWLOCK(handler_lock);
1132
1133 static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
1134                                                                 *prefix)
1135 {
1136         struct reiserfs_xattr_handler *xah = NULL;
1137         struct list_head *p;
1138
1139         read_lock(&handler_lock);
1140         list_for_each(p, &xattr_handlers) {
1141                 xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
1142                 if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0)
1143                         break;
1144                 xah = NULL;
1145         }
1146
1147         read_unlock(&handler_lock);
1148         return xah;
1149 }
1150
1151 static void __unregister_handlers(void)
1152 {
1153         struct reiserfs_xattr_handler *xah;
1154         struct list_head *p, *tmp;
1155
1156         list_for_each_safe(p, tmp, &xattr_handlers) {
1157                 xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
1158                 if (xah->exit)
1159                         xah->exit();
1160
1161                 list_del_init(p);
1162         }
1163         INIT_LIST_HEAD(&xattr_handlers);
1164 }
1165
1166 int __init reiserfs_xattr_register_handlers(void)
1167 {
1168         int err = 0;
1169         struct reiserfs_xattr_handler *xah;
1170         struct list_head *p;
1171
1172         write_lock(&handler_lock);
1173
1174         /* If we're already initialized, nothing to do */
1175         if (!list_empty(&xattr_handlers)) {
1176                 write_unlock(&handler_lock);
1177                 return 0;
1178         }
1179
1180         /* Add the handlers */
1181         list_add_tail(&user_handler.handlers, &xattr_handlers);
1182         list_add_tail(&trusted_handler.handlers, &xattr_handlers);
1183 #ifdef CONFIG_REISERFS_FS_SECURITY
1184         list_add_tail(&security_handler.handlers, &xattr_handlers);
1185 #endif
1186 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1187         list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers);
1188         list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers);
1189 #endif
1190
1191         /* Run initializers, if available */
1192         list_for_each(p, &xattr_handlers) {
1193                 xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
1194                 if (xah->init) {
1195                         err = xah->init();
1196                         if (err) {
1197                                 list_del_init(p);
1198                                 break;
1199                         }
1200                 }
1201         }
1202
1203         /* Clean up other handlers, if any failed */
1204         if (err)
1205                 __unregister_handlers();
1206
1207         write_unlock(&handler_lock);
1208         return err;
1209 }
1210
1211 void reiserfs_xattr_unregister_handlers(void)
1212 {
1213         write_lock(&handler_lock);
1214         __unregister_handlers();
1215         write_unlock(&handler_lock);
1216 }
1217
1218 /* This will catch lookups from the fs root to .reiserfs_priv */
1219 static int
1220 xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
1221 {
1222         struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root;
1223         if (name->len == priv_root->d_name.len &&
1224             name->hash == priv_root->d_name.hash &&
1225             !memcmp(name->name, priv_root->d_name.name, name->len)) {
1226                 return -ENOENT;
1227         } else if (q1->len == name->len &&
1228                    !memcmp(q1->name, name->name, name->len))
1229                 return 0;
1230         return 1;
1231 }
1232
1233 static struct dentry_operations xattr_lookup_poison_ops = {
1234         .d_compare = xattr_lookup_poison,
1235 };
1236
1237 /* We need to take a copy of the mount flags since things like
1238  * MS_RDONLY don't get set until *after* we're called.
1239  * mount_flags != mount_options */
1240 int reiserfs_xattr_init(struct super_block *s, int mount_flags)
1241 {
1242         int err = 0;
1243
1244         /* We need generation numbers to ensure that the oid mapping is correct
1245          * v3.5 filesystems don't have them. */
1246         if (!old_format_only(s)) {
1247                 set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
1248         } else if (reiserfs_xattrs_optional(s)) {
1249                 /* Old format filesystem, but optional xattrs have been enabled
1250                  * at mount time. Error out. */
1251                 reiserfs_warning(s, "xattrs/ACLs not supported on pre v3.6 "
1252                                  "format filesystem. Failing mount.");
1253                 err = -EOPNOTSUPP;
1254                 goto error;
1255         } else {
1256                 /* Old format filesystem, but no optional xattrs have been enabled. This
1257                  * means we silently disable xattrs on the filesystem. */
1258                 clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
1259         }
1260
1261         /* If we don't have the privroot located yet - go find it */
1262         if (reiserfs_xattrs(s) && !REISERFS_SB(s)->priv_root) {
1263                 struct dentry *dentry;
1264                 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
1265                                         strlen(PRIVROOT_NAME));
1266                 if (!IS_ERR(dentry)) {
1267                         if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) {
1268                                 struct inode *inode = dentry->d_parent->d_inode;
1269                                 mutex_lock(&inode->i_mutex);
1270                                 err = inode->i_op->mkdir(inode, dentry, 0700);
1271                                 mutex_unlock(&inode->i_mutex);
1272                                 if (err) {
1273                                         dput(dentry);
1274                                         dentry = NULL;
1275                                 }
1276
1277                                 if (dentry && dentry->d_inode)
1278                                         reiserfs_warning(s,
1279                                                          "Created %s on %s - reserved for "
1280                                                          "xattr storage.",
1281                                                          PRIVROOT_NAME,
1282                                                          reiserfs_bdevname
1283                                                          (inode->i_sb));
1284                         } else if (!dentry->d_inode) {
1285                                 dput(dentry);
1286                                 dentry = NULL;
1287                         }
1288                 } else
1289                         err = PTR_ERR(dentry);
1290
1291                 if (!err && dentry) {
1292                         s->s_root->d_op = &xattr_lookup_poison_ops;
1293                         reiserfs_mark_inode_private(dentry->d_inode);
1294                         REISERFS_SB(s)->priv_root = dentry;
1295                 } else if (!(mount_flags & MS_RDONLY)) {        /* xattrs are unavailable */
1296                         /* If we're read-only it just means that the dir hasn't been
1297                          * created. Not an error -- just no xattrs on the fs. We'll
1298                          * check again if we go read-write */
1299                         reiserfs_warning(s, "xattrs/ACLs enabled and couldn't "
1300                                          "find/create .reiserfs_priv. Failing mount.");
1301                         err = -EOPNOTSUPP;
1302                 }
1303         }
1304
1305       error:
1306         /* This is only nonzero if there was an error initializing the xattr
1307          * directory or if there is a condition where we don't support them. */
1308         if (err) {
1309                 clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
1310                 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
1311                 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
1312         }
1313
1314         /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
1315         s->s_flags = s->s_flags & ~MS_POSIXACL;
1316         if (reiserfs_posixacl(s))
1317                 s->s_flags |= MS_POSIXACL;
1318
1319         return err;
1320 }
1321
1322 static int reiserfs_check_acl(struct inode *inode, int mask)
1323 {
1324         struct posix_acl *acl;
1325         int error = -EAGAIN; /* do regular unix permission checks by default */
1326
1327         reiserfs_read_lock_xattr_i(inode);
1328         reiserfs_read_lock_xattrs(inode->i_sb);
1329
1330         acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
1331
1332         reiserfs_read_unlock_xattrs(inode->i_sb);
1333         reiserfs_read_unlock_xattr_i(inode);
1334
1335         if (acl) {
1336                 if (!IS_ERR(acl)) {
1337                         error = posix_acl_permission(inode, acl, mask);
1338                         posix_acl_release(acl);
1339                 } else if (PTR_ERR(acl) != -ENODATA)
1340                         error = PTR_ERR(acl);
1341         }
1342
1343         return error;
1344 }
1345
1346 int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd)
1347 {
1348         /*
1349          * We don't do permission checks on the internal objects.
1350          * Permissions are determined by the "owning" object.
1351          */
1352         if (is_reiserfs_priv_object(inode))
1353                 return 0;
1354
1355         /*
1356          * Stat data v1 doesn't support ACLs.
1357          */
1358         if (get_inode_sd_version(inode) == STAT_DATA_V1)
1359                 return generic_permission(inode, mask, NULL);
1360         else
1361                 return generic_permission(inode, mask, reiserfs_check_acl);
1362 }