git.oblomov.eu Git - linux-2.6/blob - fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <asm/uaccess.h>
  19 #include <linux/reiserfs_fs.h>
  20 #include <linux/reiserfs_acl.h>
  21 #include <linux/reiserfs_xattr.h>
  22 #include <linux/smp_lock.h>
  23 #include <linux/init.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/buffer_head.h>
  26 #include <linux/vfs.h>
  27 #include <linux/namespace.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/quotaops.h>
  31
  32 struct file_system_type reiserfs_fs_type;
  33
  34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  37
  38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  39 {
  40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  41                         strlen(reiserfs_3_5_magic_string));
  42 }
  43
  44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  45 {
  46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  47                         strlen(reiserfs_3_6_magic_string));
  48 }
  49
  50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  51 {
  52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  53                         strlen(reiserfs_jr_magic_string));
  54 }
  55
  56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  57 {
  58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  59                 is_reiserfs_jr(rs));
  60 }
  61
  62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  63 static int reiserfs_statfs(struct super_block *s, struct kstatfs *buf);
  64
  65 static int reiserfs_sync_fs(struct super_block *s, int wait)
  66 {
  67         if (!(s->s_flags & MS_RDONLY)) {
  68                 struct reiserfs_transaction_handle th;
  69                 reiserfs_write_lock(s);
  70                 if (!journal_begin(&th, s, 1))
  71                         if (!journal_end_sync(&th, s, 1))
  72                                 reiserfs_flush_old_commits(s);
  73                 s->s_dirt = 0;  /* Even if it's not true.
  74                                  * We'll loop forever in sync_supers otherwise */
  75                 reiserfs_write_unlock(s);
  76         } else {
  77                 s->s_dirt = 0;
  78         }
  79         return 0;
  80 }
  81
  82 static void reiserfs_write_super(struct super_block *s)
  83 {
  84         reiserfs_sync_fs(s, 1);
  85 }
  86
  87 static void reiserfs_write_super_lockfs(struct super_block *s)
  88 {
  89         struct reiserfs_transaction_handle th;
  90         reiserfs_write_lock(s);
  91         if (!(s->s_flags & MS_RDONLY)) {
  92                 int err = journal_begin(&th, s, 1);
  93                 if (err) {
  94                         reiserfs_block_writes(&th);
  95                 } else {
  96                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  97                                                      1);
  98                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  99                         reiserfs_block_writes(&th);
 100                         journal_end_sync(&th, s, 1);
 101                 }
 102         }
 103         s->s_dirt = 0;
 104         reiserfs_write_unlock(s);
 105 }
 106
 107 static void reiserfs_unlockfs(struct super_block *s)
 108 {
 109         reiserfs_allow_writes(s);
 110 }
 111
 112 extern const struct in_core_key MAX_IN_CORE_KEY;
 113
 114 /* this is used to delete "save link" when there are no items of a
 115    file it points to. It can either happen if unlink is completed but
 116    "save unlink" removal, or if file has both unlink and truncate
 117    pending and as unlink completes first (because key of "save link"
 118    protecting unlink is bigger that a key lf "save link" which
 119    protects truncate), so there left no items to make truncate
 120    completion on */
 121 static int remove_save_link_only(struct super_block *s,
 122                                  struct reiserfs_key *key, int oid_free)
 123 {
 124         struct reiserfs_transaction_handle th;
 125         int err;
 126
 127         /* we are going to do one balancing */
 128         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 129         if (err)
 130                 return err;
 131
 132         reiserfs_delete_solid_item(&th, NULL, key);
 133         if (oid_free)
 134                 /* removals are protected by direct items */
 135                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 136
 137         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 138 }
 139
 140 #ifdef CONFIG_QUOTA
 141 static int reiserfs_quota_on_mount(struct super_block *, int);
 142 #endif
 143
 144 /* look for uncompleted unlinks and truncates and complete them */
 145 static int finish_unfinished(struct super_block *s)
 146 {
 147         INITIALIZE_PATH(path);
 148         struct cpu_key max_cpu_key, obj_key;
 149         struct reiserfs_key save_link_key;
 150         int retval = 0;
 151         struct item_head *ih;
 152         struct buffer_head *bh;
 153         int item_pos;
 154         char *item;
 155         int done;
 156         struct inode *inode;
 157         int truncate;
 158 #ifdef CONFIG_QUOTA
 159         int i;
 160         int ms_active_set;
 161 #endif
 162
 163         /* compose key to look for "save" links */
 164         max_cpu_key.version = KEY_FORMAT_3_5;
 165         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 166         max_cpu_key.on_disk_key.k_objectid = ~0U;
 167         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 168         max_cpu_key.key_length = 3;
 169
 170 #ifdef CONFIG_QUOTA
 171         /* Needed for iput() to work correctly and not trash data */
 172         if (s->s_flags & MS_ACTIVE) {
 173                 ms_active_set = 0;
 174         } else {
 175                 ms_active_set = 1;
 176                 s->s_flags |= MS_ACTIVE;
 177         }
 178         /* Turn on quotas so that they are updated correctly */
 179         for (i = 0; i < MAXQUOTAS; i++) {
 180                 if (REISERFS_SB(s)->s_qf_names[i]) {
 181                         int ret = reiserfs_quota_on_mount(s, i);
 182                         if (ret < 0)
 183                                 reiserfs_warning(s,
 184                                                  "reiserfs: cannot turn on journalled quota: error %d",
 185                                                  ret);
 186                 }
 187         }
 188 #endif
 189
 190         done = 0;
 191         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 192         while (!retval) {
 193                 retval = search_item(s, &max_cpu_key, &path);
 194                 if (retval != ITEM_NOT_FOUND) {
 195                         reiserfs_warning(s,
 196                                          "vs-2140: finish_unfinished: search_by_key returned %d",
 197                                          retval);
 198                         break;
 199                 }
 200
 201                 bh = get_last_bh(&path);
 202                 item_pos = get_item_pos(&path);
 203                 if (item_pos != B_NR_ITEMS(bh)) {
 204                         reiserfs_warning(s,
 205                                          "vs-2060: finish_unfinished: wrong position found");
 206                         break;
 207                 }
 208                 item_pos--;
 209                 ih = B_N_PITEM_HEAD(bh, item_pos);
 210
 211                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 212                         /* there are no "save" links anymore */
 213                         break;
 214
 215                 save_link_key = ih->ih_key;
 216                 if (is_indirect_le_ih(ih))
 217                         truncate = 1;
 218                 else
 219                         truncate = 0;
 220
 221                 /* reiserfs_iget needs k_dirid and k_objectid only */
 222                 item = B_I_PITEM(bh, ih);
 223                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 224                 obj_key.on_disk_key.k_objectid =
 225                     le32_to_cpu(ih->ih_key.k_objectid);
 226                 obj_key.on_disk_key.k_offset = 0;
 227                 obj_key.on_disk_key.k_type = 0;
 228
 229                 pathrelse(&path);
 230
 231                 inode = reiserfs_iget(s, &obj_key);
 232                 if (!inode) {
 233                         /* the unlink almost completed, it just did not manage to remove
 234                            "save" link and release objectid */
 235                         reiserfs_warning(s,
 236                                          "vs-2180: finish_unfinished: iget failed for %K",
 237                                          &obj_key);
 238                         retval = remove_save_link_only(s, &save_link_key, 1);
 239                         continue;
 240                 }
 241
 242                 if (!truncate && inode->i_nlink) {
 243                         /* file is not unlinked */
 244                         reiserfs_warning(s,
 245                                          "vs-2185: finish_unfinished: file %K is not unlinked",
 246                                          &obj_key);
 247                         retval = remove_save_link_only(s, &save_link_key, 0);
 248                         continue;
 249                 }
 250                 DQUOT_INIT(inode);
 251
 252                 if (truncate && S_ISDIR(inode->i_mode)) {
 253                         /* We got a truncate request for a dir which is impossible.
 254                            The only imaginable way is to execute unfinished truncate request
 255                            then boot into old kernel, remove the file and create dir with
 256                            the same key. */
 257                         reiserfs_warning(s,
 258                                          "green-2101: impossible truncate on a directory %k. Please report",
 259                                          INODE_PKEY(inode));
 260                         retval = remove_save_link_only(s, &save_link_key, 0);
 261                         truncate = 0;
 262                         iput(inode);
 263                         continue;
 264                 }
 265
 266                 if (truncate) {
 267                         REISERFS_I(inode)->i_flags |=
 268                             i_link_saved_truncate_mask;
 269                         /* not completed truncate found. New size was committed together
 270                            with "save" link */
 271                         reiserfs_info(s, "Truncating %k to %Ld ..",
 272                                       INODE_PKEY(inode), inode->i_size);
 273                         reiserfs_truncate_file(inode,
 274                                                0
 275                                                /*don't update modification time */
 276                                                );
 277                         retval = remove_save_link(inode, truncate);
 278                 } else {
 279                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 280                         /* not completed unlink (rmdir) found */
 281                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 282                         /* removal gets completed in iput */
 283                         retval = 0;
 284                 }
 285
 286                 iput(inode);
 287                 printk("done\n");
 288                 done++;
 289         }
 290         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 291
 292 #ifdef CONFIG_QUOTA
 293         /* Turn quotas off */
 294         for (i = 0; i < MAXQUOTAS; i++) {
 295                 if (sb_dqopt(s)->files[i])
 296                         vfs_quota_off_mount(s, i);
 297         }
 298         if (ms_active_set)
 299                 /* Restore the flag back */
 300                 s->s_flags &= ~MS_ACTIVE;
 301 #endif
 302         pathrelse(&path);
 303         if (done)
 304                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 305                               "Completed\n", done);
 306         return retval;
 307 }
 308
 309 /* to protect file being unlinked from getting lost we "safe" link files
 310    being unlinked. This link will be deleted in the same transaction with last
 311    item of file. mounting the filesytem we scan all these links and remove
 312    files which almost got lost */
 313 void add_save_link(struct reiserfs_transaction_handle *th,
 314                    struct inode *inode, int truncate)
 315 {
 316         INITIALIZE_PATH(path);
 317         int retval;
 318         struct cpu_key key;
 319         struct item_head ih;
 320         __le32 link;
 321
 322         BUG_ON(!th->t_trans_id);
 323
 324         /* file can only get one "save link" of each kind */
 325         RFALSE(truncate &&
 326                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 327                "saved link already exists for truncated inode %lx",
 328                (long)inode->i_ino);
 329         RFALSE(!truncate &&
 330                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 331                "saved link already exists for unlinked inode %lx",
 332                (long)inode->i_ino);
 333
 334         /* setup key of "save" link */
 335         key.version = KEY_FORMAT_3_5;
 336         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 337         key.on_disk_key.k_objectid = inode->i_ino;
 338         if (!truncate) {
 339                 /* unlink, rmdir, rename */
 340                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 341                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 342
 343                 /* item head of "safe" link */
 344                 make_le_item_head(&ih, &key, key.version,
 345                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 346                                   4 /*length */ , 0xffff /*free space */ );
 347         } else {
 348                 /* truncate */
 349                 if (S_ISDIR(inode->i_mode))
 350                         reiserfs_warning(inode->i_sb,
 351                                          "green-2102: Adding a truncate savelink for a directory %k! Please report",
 352                                          INODE_PKEY(inode));
 353                 set_cpu_key_k_offset(&key, 1);
 354                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 355
 356                 /* item head of "safe" link */
 357                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 358                                   4 /*length */ , 0 /*free space */ );
 359         }
 360         key.key_length = 3;
 361
 362         /* look for its place in the tree */
 363         retval = search_item(inode->i_sb, &key, &path);
 364         if (retval != ITEM_NOT_FOUND) {
 365                 if (retval != -ENOSPC)
 366                         reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
 367                                          "search_by_key (%K) returned %d", &key,
 368                                          retval);
 369                 pathrelse(&path);
 370                 return;
 371         }
 372
 373         /* body of "save" link */
 374         link = INODE_PKEY(inode)->k_dir_id;
 375
 376         /* put "save" link inot tree, don't charge quota to anyone */
 377         retval =
 378             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 379         if (retval) {
 380                 if (retval != -ENOSPC)
 381                         reiserfs_warning(inode->i_sb,
 382                                          "vs-2120: add_save_link: insert_item returned %d",
 383                                          retval);
 384         } else {
 385                 if (truncate)
 386                         REISERFS_I(inode)->i_flags |=
 387                             i_link_saved_truncate_mask;
 388                 else
 389                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 390         }
 391 }
 392
 393 /* this opens transaction unlike add_save_link */
 394 int remove_save_link(struct inode *inode, int truncate)
 395 {
 396         struct reiserfs_transaction_handle th;
 397         struct reiserfs_key key;
 398         int err;
 399
 400         /* we are going to do one balancing only */
 401         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 402         if (err)
 403                 return err;
 404
 405         /* setup key of "save" link */
 406         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 407         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 408         if (!truncate) {
 409                 /* unlink, rmdir, rename */
 410                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 411                                     1 + inode->i_sb->s_blocksize);
 412                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 413         } else {
 414                 /* truncate */
 415                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 416                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 417         }
 418
 419         if ((truncate &&
 420              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 421             (!truncate &&
 422              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 423                 /* don't take quota bytes from anywhere */
 424                 reiserfs_delete_solid_item(&th, NULL, &key);
 425         if (!truncate) {
 426                 reiserfs_release_objectid(&th, inode->i_ino);
 427                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 428         } else
 429                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 430
 431         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 432 }
 433
 434 static void reiserfs_put_super(struct super_block *s)
 435 {
 436         int i;
 437         struct reiserfs_transaction_handle th;
 438         th.t_trans_id = 0;
 439
 440         if (REISERFS_SB(s)->xattr_root) {
 441                 d_invalidate(REISERFS_SB(s)->xattr_root);
 442                 dput(REISERFS_SB(s)->xattr_root);
 443         }
 444
 445         if (REISERFS_SB(s)->priv_root) {
 446                 d_invalidate(REISERFS_SB(s)->priv_root);
 447                 dput(REISERFS_SB(s)->priv_root);
 448         }
 449
 450         /* change file system state to current state if it was mounted with read-write permissions */
 451         if (!(s->s_flags & MS_RDONLY)) {
 452                 if (!journal_begin(&th, s, 10)) {
 453                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 454                                                      1);
 455                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 456                                             REISERFS_SB(s)->s_mount_state);
 457                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 458                 }
 459         }
 460
 461         /* note, journal_release checks for readonly mount, and can decide not
 462          ** to do a journal_end
 463          */
 464         journal_release(&th, s);
 465
 466         for (i = 0; i < SB_BMAP_NR(s); i++)
 467                 brelse(SB_AP_BITMAP(s)[i].bh);
 468
 469         vfree(SB_AP_BITMAP(s));
 470
 471         brelse(SB_BUFFER_WITH_SB(s));
 472
 473         print_statistics(s);
 474
 475         if (REISERFS_SB(s)->s_kmallocs != 0) {
 476                 reiserfs_warning(s,
 477                                  "vs-2004: reiserfs_put_super: allocated memory left %d",
 478                                  REISERFS_SB(s)->s_kmallocs);
 479         }
 480
 481         if (REISERFS_SB(s)->reserved_blocks != 0) {
 482                 reiserfs_warning(s,
 483                                  "green-2005: reiserfs_put_super: reserved blocks left %d",
 484                                  REISERFS_SB(s)->reserved_blocks);
 485         }
 486
 487         reiserfs_proc_info_done(s);
 488
 489         kfree(s->s_fs_info);
 490         s->s_fs_info = NULL;
 491
 492         return;
 493 }
 494
 495 static kmem_cache_t *reiserfs_inode_cachep;
 496
 497 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 498 {
 499         struct reiserfs_inode_info *ei;
 500         ei = (struct reiserfs_inode_info *)
 501             kmem_cache_alloc(reiserfs_inode_cachep, SLAB_KERNEL);
 502         if (!ei)
 503                 return NULL;
 504         return &ei->vfs_inode;
 505 }
 506
 507 static void reiserfs_destroy_inode(struct inode *inode)
 508 {
 509         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 510 }
 511
 512 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 513 {
 514         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 515
 516         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 517             SLAB_CTOR_CONSTRUCTOR) {
 518                 INIT_LIST_HEAD(&ei->i_prealloc_list);
 519                 inode_init_once(&ei->vfs_inode);
 520                 ei->i_acl_access = NULL;
 521                 ei->i_acl_default = NULL;
 522         }
 523 }
 524
 525 static int init_inodecache(void)
 526 {
 527         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 528                                                   sizeof(struct
 529                                                          reiserfs_inode_info),
 530                                                   0, SLAB_RECLAIM_ACCOUNT,
 531                                                   init_once, NULL);
 532         if (reiserfs_inode_cachep == NULL)
 533                 return -ENOMEM;
 534         return 0;
 535 }
 536
 537 static void destroy_inodecache(void)
 538 {
 539         if (kmem_cache_destroy(reiserfs_inode_cachep))
 540                 reiserfs_warning(NULL,
 541                                  "reiserfs_inode_cache: not all structures were freed");
 542 }
 543
 544 /* we don't mark inodes dirty, we just log them */
 545 static void reiserfs_dirty_inode(struct inode *inode)
 546 {
 547         struct reiserfs_transaction_handle th;
 548
 549         int err = 0;
 550         if (inode->i_sb->s_flags & MS_RDONLY) {
 551                 reiserfs_warning(inode->i_sb,
 552                                  "clm-6006: writing inode %lu on readonly FS",
 553                                  inode->i_ino);
 554                 return;
 555         }
 556         reiserfs_write_lock(inode->i_sb);
 557
 558         /* this is really only used for atime updates, so they don't have
 559          ** to be included in O_SYNC or fsync
 560          */
 561         err = journal_begin(&th, inode->i_sb, 1);
 562         if (err) {
 563                 reiserfs_write_unlock(inode->i_sb);
 564                 return;
 565         }
 566         reiserfs_update_sd(&th, inode);
 567         journal_end(&th, inode->i_sb, 1);
 568         reiserfs_write_unlock(inode->i_sb);
 569 }
 570
 571 static void reiserfs_clear_inode(struct inode *inode)
 572 {
 573         struct posix_acl *acl;
 574
 575         acl = REISERFS_I(inode)->i_acl_access;
 576         if (acl && !IS_ERR(acl))
 577                 posix_acl_release(acl);
 578         REISERFS_I(inode)->i_acl_access = NULL;
 579
 580         acl = REISERFS_I(inode)->i_acl_default;
 581         if (acl && !IS_ERR(acl))
 582                 posix_acl_release(acl);
 583         REISERFS_I(inode)->i_acl_default = NULL;
 584 }
 585
 586 #ifdef CONFIG_QUOTA
 587 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 588                                     size_t, loff_t);
 589 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 590                                    loff_t);
 591 #endif
 592
 593 static struct super_operations reiserfs_sops = {
 594         .alloc_inode = reiserfs_alloc_inode,
 595         .destroy_inode = reiserfs_destroy_inode,
 596         .write_inode = reiserfs_write_inode,
 597         .dirty_inode = reiserfs_dirty_inode,
 598         .delete_inode = reiserfs_delete_inode,
 599         .clear_inode = reiserfs_clear_inode,
 600         .put_super = reiserfs_put_super,
 601         .write_super = reiserfs_write_super,
 602         .sync_fs = reiserfs_sync_fs,
 603         .write_super_lockfs = reiserfs_write_super_lockfs,
 604         .unlockfs = reiserfs_unlockfs,
 605         .statfs = reiserfs_statfs,
 606         .remount_fs = reiserfs_remount,
 607 #ifdef CONFIG_QUOTA
 608         .quota_read = reiserfs_quota_read,
 609         .quota_write = reiserfs_quota_write,
 610 #endif
 611 };
 612
 613 #ifdef CONFIG_QUOTA
 614 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 615
 616 static int reiserfs_dquot_initialize(struct inode *, int);
 617 static int reiserfs_dquot_drop(struct inode *);
 618 static int reiserfs_write_dquot(struct dquot *);
 619 static int reiserfs_acquire_dquot(struct dquot *);
 620 static int reiserfs_release_dquot(struct dquot *);
 621 static int reiserfs_mark_dquot_dirty(struct dquot *);
 622 static int reiserfs_write_info(struct super_block *, int);
 623 static int reiserfs_quota_on(struct super_block *, int, int, char *);
 624
 625 static struct dquot_operations reiserfs_quota_operations = {
 626         .initialize = reiserfs_dquot_initialize,
 627         .drop = reiserfs_dquot_drop,
 628         .alloc_space = dquot_alloc_space,
 629         .alloc_inode = dquot_alloc_inode,
 630         .free_space = dquot_free_space,
 631         .free_inode = dquot_free_inode,
 632         .transfer = dquot_transfer,
 633         .write_dquot = reiserfs_write_dquot,
 634         .acquire_dquot = reiserfs_acquire_dquot,
 635         .release_dquot = reiserfs_release_dquot,
 636         .mark_dirty = reiserfs_mark_dquot_dirty,
 637         .write_info = reiserfs_write_info,
 638 };
 639
 640 static struct quotactl_ops reiserfs_qctl_operations = {
 641         .quota_on = reiserfs_quota_on,
 642         .quota_off = vfs_quota_off,
 643         .quota_sync = vfs_quota_sync,
 644         .get_info = vfs_get_dqinfo,
 645         .set_info = vfs_set_dqinfo,
 646         .get_dqblk = vfs_get_dqblk,
 647         .set_dqblk = vfs_set_dqblk,
 648 };
 649 #endif
 650
 651 static struct export_operations reiserfs_export_ops = {
 652         .encode_fh = reiserfs_encode_fh,
 653         .decode_fh = reiserfs_decode_fh,
 654         .get_parent = reiserfs_get_parent,
 655         .get_dentry = reiserfs_get_dentry,
 656 };
 657
 658 /* this struct is used in reiserfs_getopt () for containing the value for those
 659    mount options that have values rather than being toggles. */
 660 typedef struct {
 661         char *value;
 662         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 663                                    value is found, 0 is no bits are to be changed. */
 664         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 665                                    value is found, 0 is no bits are to be changed. This is
 666                                    applied BEFORE setmask */
 667 } arg_desc_t;
 668
 669 /* Set this bit in arg_required to allow empty arguments */
 670 #define REISERFS_OPT_ALLOWEMPTY 31
 671
 672 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 673    mount options */
 674 typedef struct {
 675         char *option_name;
 676         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 677         const arg_desc_t *values;       /* list of values accepted by an option */
 678         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 679                                    value is found, 0 is no bits are to be changed. */
 680         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 681                                    value is found, 0 is no bits are to be changed. This is
 682                                    applied BEFORE setmask */
 683 } opt_desc_t;
 684
 685 /* possible values for -o data= */
 686 static const arg_desc_t logging_mode[] = {
 687         {"ordered", 1 << REISERFS_DATA_ORDERED,
 688          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 689         {"journal", 1 << REISERFS_DATA_LOG,
 690          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 691         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 692          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 693         {NULL, 0}
 694 };
 695
 696 /* possible values for -o barrier= */
 697 static const arg_desc_t barrier_mode[] = {
 698         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 699         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 700         {NULL, 0}
 701 };
 702
 703 /* possible values for "-o block-allocator=" and bits which are to be set in
 704    s_mount_opt of reiserfs specific part of in-core super block */
 705 static const arg_desc_t balloc[] = {
 706         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 707         {"border", 0, 1 << REISERFS_NO_BORDER},
 708         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 709         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 710         {"test4", 1 << REISERFS_TEST4, 0},
 711         {"notest4", 0, 1 << REISERFS_TEST4},
 712         {NULL, 0, 0}
 713 };
 714
 715 static const arg_desc_t tails[] = {
 716         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 717         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 718         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 719         {NULL, 0, 0}
 720 };
 721
 722 static const arg_desc_t error_actions[] = {
 723         {"panic", 1 << REISERFS_ERROR_PANIC,
 724          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 725         {"ro-remount", 1 << REISERFS_ERROR_RO,
 726          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 727 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 728         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 729          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 730 #endif
 731         {NULL, 0, 0},
 732 };
 733
 734 int reiserfs_default_io_size = 128 * 1024;      /* Default recommended I/O size is 128k.
 735                                                    There might be broken applications that are
 736                                                    confused by this. Use nolargeio mount option
 737                                                    to get usual i/o size = PAGE_SIZE.
 738                                                  */
 739
 740 /* proceed only one option from a list *cur - string containing of mount options
 741    opts - array of options which are accepted
 742    opt_arg - if option is found and requires an argument and if it is specifed
 743    in the input - pointer to the argument is stored here
 744    bit_flags - if option requires to set a certain bit - it is set here
 745    return -1 if unknown option is found, opt->arg_required otherwise */
 746 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 747                            char **opt_arg, unsigned long *bit_flags)
 748 {
 749         char *p;
 750         /* foo=bar,
 751            ^   ^  ^
 752            |   |  +-- option_end
 753            |   +-- arg_start
 754            +-- option_start
 755          */
 756         const opt_desc_t *opt;
 757         const arg_desc_t *arg;
 758
 759         p = *cur;
 760
 761         /* assume argument cannot contain commas */
 762         *cur = strchr(p, ',');
 763         if (*cur) {
 764                 *(*cur) = '\0';
 765                 (*cur)++;
 766         }
 767
 768         if (!strncmp(p, "alloc=", 6)) {
 769                 /* Ugly special case, probably we should redo options parser so that
 770                    it can understand several arguments for some options, also so that
 771                    it can fill several bitfields with option values. */
 772                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 773                         return -1;
 774                 } else {
 775                         return 0;
 776                 }
 777         }
 778
 779         /* for every option in the list */
 780         for (opt = opts; opt->option_name; opt++) {
 781                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 782                         if (bit_flags) {
 783                                 if (opt->clrmask ==
 784                                     (1 << REISERFS_UNSUPPORTED_OPT))
 785                                         reiserfs_warning(s, "%s not supported.",
 786                                                          p);
 787                                 else
 788                                         *bit_flags &= ~opt->clrmask;
 789                                 if (opt->setmask ==
 790                                     (1 << REISERFS_UNSUPPORTED_OPT))
 791                                         reiserfs_warning(s, "%s not supported.",
 792                                                          p);
 793                                 else
 794                                         *bit_flags |= opt->setmask;
 795                         }
 796                         break;
 797                 }
 798         }
 799         if (!opt->option_name) {
 800                 reiserfs_warning(s, "unknown mount option \"%s\"", p);
 801                 return -1;
 802         }
 803
 804         p += strlen(opt->option_name);
 805         switch (*p) {
 806         case '=':
 807                 if (!opt->arg_required) {
 808                         reiserfs_warning(s,
 809                                          "the option \"%s\" does not require an argument",
 810                                          opt->option_name);
 811                         return -1;
 812                 }
 813                 break;
 814
 815         case 0:
 816                 if (opt->arg_required) {
 817                         reiserfs_warning(s,
 818                                          "the option \"%s\" requires an argument",
 819                                          opt->option_name);
 820                         return -1;
 821                 }
 822                 break;
 823         default:
 824                 reiserfs_warning(s, "head of option \"%s\" is only correct",
 825                                  opt->option_name);
 826                 return -1;
 827         }
 828
 829         /* move to the argument, or to next option if argument is not required */
 830         p++;
 831
 832         if (opt->arg_required
 833             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 834             && !strlen(p)) {
 835                 /* this catches "option=," if not allowed */
 836                 reiserfs_warning(s, "empty argument for \"%s\"",
 837                                  opt->option_name);
 838                 return -1;
 839         }
 840
 841         if (!opt->values) {
 842                 /* *=NULLopt_arg contains pointer to argument */
 843                 *opt_arg = p;
 844                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 845         }
 846
 847         /* values possible for this option are listed in opt->values */
 848         for (arg = opt->values; arg->value; arg++) {
 849                 if (!strcmp(p, arg->value)) {
 850                         if (bit_flags) {
 851                                 *bit_flags &= ~arg->clrmask;
 852                                 *bit_flags |= arg->setmask;
 853                         }
 854                         return opt->arg_required;
 855                 }
 856         }
 857
 858         reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
 859                          opt->option_name);
 860         return -1;
 861 }
 862
 863 /* returns 0 if something is wrong in option string, 1 - otherwise */
 864 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 865                                   unsigned long *mount_options,
 866                                   /* after the parsing phase, contains the
 867                                      collection of bitflags defining what
 868                                      mount options were selected. */
 869                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 870                                   char **jdev_name,
 871                                   unsigned int *commit_max_age)
 872 {
 873         int c;
 874         char *arg = NULL;
 875         char *pos;
 876         opt_desc_t opts[] = {
 877                 /* Compatibility stuff, so that -o notail for old setups still work */
 878                 {"tails",.arg_required = 't',.values = tails},
 879                 {"notail",.clrmask =
 880                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 881                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 882                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 883                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 884 #ifdef CONFIG_REISERFS_FS_XATTR
 885                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 886                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 887 #else
 888                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 889                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 890 #endif
 891 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 892                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 893                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 894 #else
 895                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 896                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 897 #endif
 898                 {"nolog",},     /* This is unsupported */
 899                 {"replayonly",.setmask = 1 << REPLAYONLY},
 900                 {"block-allocator",.arg_required = 'a',.values = balloc},
 901                 {"data",.arg_required = 'd',.values = logging_mode},
 902                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 903                 {"resize",.arg_required = 'r',.values = NULL},
 904                 {"jdev",.arg_required = 'j',.values = NULL},
 905                 {"nolargeio",.arg_required = 'w',.values = NULL},
 906                 {"commit",.arg_required = 'c',.values = NULL},
 907                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 908                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 909                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 910                 {"errors",.arg_required = 'e',.values = error_actions},
 911                 {"usrjquota",.arg_required =
 912                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 913                 {"grpjquota",.arg_required =
 914                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 915                 {"jqfmt",.arg_required = 'f',.values = NULL},
 916                 {NULL,}
 917         };
 918
 919         *blocks = 0;
 920         if (!options || !*options)
 921                 /* use default configuration: create tails, journaling on, no
 922                    conversion to newest format */
 923                 return 1;
 924
 925         for (pos = options; pos;) {
 926                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 927                 if (c == -1)
 928                         /* wrong option is given */
 929                         return 0;
 930
 931                 if (c == 'r') {
 932                         char *p;
 933
 934                         p = NULL;
 935                         /* "resize=NNN" or "resize=auto" */
 936
 937                         if (!strcmp(arg, "auto")) {
 938                                 /* From JFS code, to auto-get the size. */
 939                                 *blocks =
 940                                     s->s_bdev->bd_inode->i_size >> s->
 941                                     s_blocksize_bits;
 942                         } else {
 943                                 *blocks = simple_strtoul(arg, &p, 0);
 944                                 if (*p != '\0') {
 945                                         /* NNN does not look like a number */
 946                                         reiserfs_warning(s,
 947                                                          "reiserfs_parse_options: bad value %s",
 948                                                          arg);
 949                                         return 0;
 950                                 }
 951                         }
 952                 }
 953
 954                 if (c == 'c') {
 955                         char *p = NULL;
 956                         unsigned long val = simple_strtoul(arg, &p, 0);
 957                         /* commit=NNN (time in seconds) */
 958                         if (*p != '\0' || val >= (unsigned int)-1) {
 959                                 reiserfs_warning(s,
 960                                                  "reiserfs_parse_options: bad value %s",
 961                                                  arg);
 962                                 return 0;
 963                         }
 964                         *commit_max_age = (unsigned int)val;
 965                 }
 966
 967                 if (c == 'w') {
 968                         char *p = NULL;
 969                         int val = simple_strtoul(arg, &p, 0);
 970
 971                         if (*p != '\0') {
 972                                 reiserfs_warning(s,
 973                                                  "reiserfs_parse_options: non-numeric value %s for nolargeio option",
 974                                                  arg);
 975                                 return 0;
 976                         }
 977                         if (val)
 978                                 reiserfs_default_io_size = PAGE_SIZE;
 979                         else
 980                                 reiserfs_default_io_size = 128 * 1024;
 981                 }
 982
 983                 if (c == 'j') {
 984                         if (arg && *arg && jdev_name) {
 985                                 if (*jdev_name) {       //Hm, already assigned?
 986                                         reiserfs_warning(s,
 987                                                          "reiserfs_parse_options: journal device was already  specified to be %s",
 988                                                          *jdev_name);
 989                                         return 0;
 990                                 }
 991                                 *jdev_name = arg;
 992                         }
 993                 }
 994 #ifdef CONFIG_QUOTA
 995                 if (c == 'u' || c == 'g') {
 996                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
 997
 998                         if (sb_any_quota_enabled(s)) {
 999                                 reiserfs_warning(s,
1000                                                  "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
1001                                 return 0;
1002                         }
1003                         if (*arg) {     /* Some filename specified? */
1004                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1005                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1006                                               arg)) {
1007                                         reiserfs_warning(s,
1008                                                          "reiserfs_parse_options: %s quota file already specified.",
1009                                                          QTYPE2NAME(qtype));
1010                                         return 0;
1011                                 }
1012                                 if (strchr(arg, '/')) {
1013                                         reiserfs_warning(s,
1014                                                          "reiserfs_parse_options: quotafile must be on filesystem root.");
1015                                         return 0;
1016                                 }
1017                                 REISERFS_SB(s)->s_qf_names[qtype] =
1018                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1019                                 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1020                                         reiserfs_warning(s,
1021                                                          "reiserfs_parse_options: not enough memory for storing quotafile name.");
1022                                         return 0;
1023                                 }
1024                                 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1025                                 *mount_options |= 1 << REISERFS_QUOTA;
1026                         } else {
1027                                 if (REISERFS_SB(s)->s_qf_names[qtype]) {
1028                                         kfree(REISERFS_SB(s)->
1029                                               s_qf_names[qtype]);
1030                                         REISERFS_SB(s)->s_qf_names[qtype] =
1031                                             NULL;
1032                                 }
1033                         }
1034                 }
1035                 if (c == 'f') {
1036                         if (!strcmp(arg, "vfsold"))
1037                                 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1038                         else if (!strcmp(arg, "vfsv0"))
1039                                 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1040                         else {
1041                                 reiserfs_warning(s,
1042                                                  "reiserfs_parse_options: unknown quota format specified.");
1043                                 return 0;
1044                         }
1045                 }
1046 #else
1047                 if (c == 'u' || c == 'g' || c == 'f') {
1048                         reiserfs_warning(s,
1049                                          "reiserfs_parse_options: journalled quota options not supported.");
1050                         return 0;
1051                 }
1052 #endif
1053         }
1054
1055 #ifdef CONFIG_QUOTA
1056         if (!REISERFS_SB(s)->s_jquota_fmt
1057             && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1058                 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1059                 reiserfs_warning(s,
1060                                  "reiserfs_parse_options: journalled quota format not specified.");
1061                 return 0;
1062         }
1063         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1064         if (!(*mount_options & (1 << REISERFS_QUOTA))
1065             && sb_any_quota_enabled(s)) {
1066                 reiserfs_warning(s,
1067                                  "reiserfs_parse_options: quota options must be present when quota is turned on.");
1068                 return 0;
1069         }
1070 #endif
1071
1072         return 1;
1073 }
1074
1075 static void switch_data_mode(struct super_block *s, unsigned long mode)
1076 {
1077         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1078                                          (1 << REISERFS_DATA_ORDERED) |
1079                                          (1 << REISERFS_DATA_WRITEBACK));
1080         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1081 }
1082
1083 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1084 {
1085         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1086                 if (!reiserfs_data_log(s)) {
1087                         switch_data_mode(s, REISERFS_DATA_LOG);
1088                         reiserfs_info(s, "switching to journaled data mode\n");
1089                 }
1090         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1091                 if (!reiserfs_data_ordered(s)) {
1092                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1093                         reiserfs_info(s, "switching to ordered data mode\n");
1094                 }
1095         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1096                 if (!reiserfs_data_writeback(s)) {
1097                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1098                         reiserfs_info(s, "switching to writeback data mode\n");
1099                 }
1100         }
1101 }
1102
1103 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1104 {
1105         int flush = (1 << REISERFS_BARRIER_FLUSH);
1106         int none = (1 << REISERFS_BARRIER_NONE);
1107         int all_barrier = flush | none;
1108
1109         if (bits & all_barrier) {
1110                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1111                 if (bits & flush) {
1112                         REISERFS_SB(s)->s_mount_opt |= flush;
1113                         printk("reiserfs: enabling write barrier flush mode\n");
1114                 } else if (bits & none) {
1115                         REISERFS_SB(s)->s_mount_opt |= none;
1116                         printk("reiserfs: write barriers turned off\n");
1117                 }
1118         }
1119 }
1120
1121 static void handle_attrs(struct super_block *s)
1122 {
1123         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1124
1125         if (reiserfs_attrs(s)) {
1126                 if (old_format_only(s)) {
1127                         reiserfs_warning(s,
1128                                          "reiserfs: cannot support attributes on 3.5.x disk format");
1129                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1130                         return;
1131                 }
1132                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1133                         reiserfs_warning(s,
1134                                          "reiserfs: cannot support attributes until flag is set in super-block");
1135                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1136                 }
1137         } else if (le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared) {
1138                 REISERFS_SB(s)->s_mount_opt |= REISERFS_ATTRS;
1139         }
1140 }
1141
1142 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1143 {
1144         struct reiserfs_super_block *rs;
1145         struct reiserfs_transaction_handle th;
1146         unsigned long blocks;
1147         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1148         unsigned long safe_mask = 0;
1149         unsigned int commit_max_age = (unsigned int)-1;
1150         struct reiserfs_journal *journal = SB_JOURNAL(s);
1151         int err;
1152 #ifdef CONFIG_QUOTA
1153         int i;
1154 #endif
1155
1156         rs = SB_DISK_SUPER_BLOCK(s);
1157
1158         if (!reiserfs_parse_options
1159             (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1160 #ifdef CONFIG_QUOTA
1161                 for (i = 0; i < MAXQUOTAS; i++)
1162                         if (REISERFS_SB(s)->s_qf_names[i]) {
1163                                 kfree(REISERFS_SB(s)->s_qf_names[i]);
1164                                 REISERFS_SB(s)->s_qf_names[i] = NULL;
1165                         }
1166 #endif
1167                 return -EINVAL;
1168         }
1169
1170         handle_attrs(s);
1171
1172         /* Add options that are safe here */
1173         safe_mask |= 1 << REISERFS_SMALLTAIL;
1174         safe_mask |= 1 << REISERFS_LARGETAIL;
1175         safe_mask |= 1 << REISERFS_NO_BORDER;
1176         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1177         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1178         safe_mask |= 1 << REISERFS_TEST4;
1179         safe_mask |= 1 << REISERFS_ATTRS;
1180         safe_mask |= 1 << REISERFS_XATTRS_USER;
1181         safe_mask |= 1 << REISERFS_POSIXACL;
1182         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1183         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1184         safe_mask |= 1 << REISERFS_ERROR_RO;
1185         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1186         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1187         safe_mask |= 1 << REISERFS_QUOTA;
1188
1189         /* Update the bitmask, taking care to keep
1190          * the bits we're not allowed to change here */
1191         REISERFS_SB(s)->s_mount_opt =
1192             (REISERFS_SB(s)->
1193              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1194
1195         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1196                 journal->j_max_commit_age = commit_max_age;
1197                 journal->j_max_trans_age = commit_max_age;
1198         } else if (commit_max_age == 0) {
1199                 /* 0 means restore defaults. */
1200                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1201                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1202         }
1203
1204         if (blocks) {
1205                 int rc = reiserfs_resize(s, blocks);
1206                 if (rc != 0)
1207                         return rc;
1208         }
1209
1210         if (*mount_flags & MS_RDONLY) {
1211                 reiserfs_xattr_init(s, *mount_flags);
1212                 /* remount read-only */
1213                 if (s->s_flags & MS_RDONLY)
1214                         /* it is read-only already */
1215                         return 0;
1216                 /* try to remount file system with read-only permissions */
1217                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1218                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1219                         return 0;
1220                 }
1221
1222                 err = journal_begin(&th, s, 10);
1223                 if (err)
1224                         return err;
1225
1226                 /* Mounting a rw partition read-only. */
1227                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1228                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1229                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1230         } else {
1231                 /* remount read-write */
1232                 if (!(s->s_flags & MS_RDONLY)) {
1233                         reiserfs_xattr_init(s, *mount_flags);
1234                         return 0;       /* We are read-write already */
1235                 }
1236
1237                 if (reiserfs_is_journal_aborted(journal))
1238                         return journal->j_errno;
1239
1240                 handle_data_mode(s, mount_options);
1241                 handle_barrier_mode(s, mount_options);
1242                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1243                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1244                 err = journal_begin(&th, s, 10);
1245                 if (err)
1246                         return err;
1247
1248                 /* Mount a partition which is read-only, read-write */
1249                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1250                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1251                 s->s_flags &= ~MS_RDONLY;
1252                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1253                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1254                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1255                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1256         }
1257         /* this will force a full flush of all journal lists */
1258         SB_JOURNAL(s)->j_must_wait = 1;
1259         err = journal_end(&th, s, 10);
1260         if (err)
1261                 return err;
1262         s->s_dirt = 0;
1263
1264         if (!(*mount_flags & MS_RDONLY)) {
1265                 finish_unfinished(s);
1266                 reiserfs_xattr_init(s, *mount_flags);
1267         }
1268
1269         return 0;
1270 }
1271
1272 /* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure from disk.
1273  * @sb - superblock for this filesystem
1274  * @bi - the bitmap info to be loaded. Requires that bi->bh is valid.
1275  *
1276  * This routine counts how many free bits there are, finding the first zero
1277  * as a side effect. Could also be implemented as a loop of test_bit() calls, or
1278  * a loop of find_first_zero_bit() calls. This implementation is similar to
1279  * find_first_zero_bit(), but doesn't return after it finds the first bit.
1280  * Should only be called on fs mount, but should be fairly efficient anyways.
1281  *
1282  * bi->first_zero_hint is considered unset if it == 0, since the bitmap itself
1283  * will * invariably occupt block 0 represented in the bitmap. The only
1284  * exception to this is when free_count also == 0, since there will be no
1285  * free blocks at all.
1286  */
1287
1288 static void load_bitmap_info_data(struct super_block *sb,
1289                                   struct reiserfs_bitmap_info *bi)
1290 {
1291         unsigned long *cur = (unsigned long *)bi->bh->b_data;
1292
1293         while ((char *)cur < (bi->bh->b_data + sb->s_blocksize)) {
1294
1295                 /* No need to scan if all 0's or all 1's.
1296                  * Since we're only counting 0's, we can simply ignore all 1's */
1297                 if (*cur == 0) {
1298                         if (bi->first_zero_hint == 0) {
1299                                 bi->first_zero_hint =
1300                                     ((char *)cur - bi->bh->b_data) << 3;
1301                         }
1302                         bi->free_count += sizeof(unsigned long) * 8;
1303                 } else if (*cur != ~0L) {
1304                         int b;
1305                         for (b = 0; b < sizeof(unsigned long) * 8; b++) {
1306                                 if (!reiserfs_test_le_bit(b, cur)) {
1307                                         bi->free_count++;
1308                                         if (bi->first_zero_hint == 0)
1309                                                 bi->first_zero_hint =
1310                                                     (((char *)cur -
1311                                                       bi->bh->b_data) << 3) + b;
1312                                 }
1313                         }
1314                 }
1315                 cur++;
1316         }
1317
1318 #ifdef CONFIG_REISERFS_CHECK
1319 // This outputs a lot of unneded info on big FSes
1320 //    reiserfs_warning ("bitmap loaded from block %d: %d free blocks",
1321 //                    bi->bh->b_blocknr, bi->free_count);
1322 #endif
1323 }
1324
1325 static int read_bitmaps(struct super_block *s)
1326 {
1327         int i, bmap_nr;
1328
1329         SB_AP_BITMAP(s) =
1330             vmalloc(sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1331         if (SB_AP_BITMAP(s) == 0)
1332                 return 1;
1333         memset(SB_AP_BITMAP(s), 0,
1334                sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1335         for (i = 0, bmap_nr =
1336              REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1;
1337              i < SB_BMAP_NR(s); i++, bmap_nr = s->s_blocksize * 8 * i) {
1338                 SB_AP_BITMAP(s)[i].bh = sb_getblk(s, bmap_nr);
1339                 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
1340                         ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);
1341         }
1342         for (i = 0; i < SB_BMAP_NR(s); i++) {
1343                 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1344                 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1345                         reiserfs_warning(s, "sh-2029: reiserfs read_bitmaps: "
1346                                          "bitmap block (#%lu) reading failed",
1347                                          SB_AP_BITMAP(s)[i].bh->b_blocknr);
1348                         for (i = 0; i < SB_BMAP_NR(s); i++)
1349                                 brelse(SB_AP_BITMAP(s)[i].bh);
1350                         vfree(SB_AP_BITMAP(s));
1351                         SB_AP_BITMAP(s) = NULL;
1352                         return 1;
1353                 }
1354                 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1355         }
1356         return 0;
1357 }
1358
1359 static int read_old_bitmaps(struct super_block *s)
1360 {
1361         int i;
1362         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1363         int bmp1 = (REISERFS_OLD_DISK_OFFSET_IN_BYTES / s->s_blocksize) + 1;    /* first of bitmap blocks */
1364
1365         /* read true bitmap */
1366         SB_AP_BITMAP(s) =
1367             vmalloc(sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1368         if (SB_AP_BITMAP(s) == 0)
1369                 return 1;
1370
1371         memset(SB_AP_BITMAP(s), 0,
1372                sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1373
1374         for (i = 0; i < sb_bmap_nr(rs); i++) {
1375                 SB_AP_BITMAP(s)[i].bh = sb_bread(s, bmp1 + i);
1376                 if (!SB_AP_BITMAP(s)[i].bh)
1377                         return 1;
1378                 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1379         }
1380
1381         return 0;
1382 }
1383
1384 static int read_super_block(struct super_block *s, int offset)
1385 {
1386         struct buffer_head *bh;
1387         struct reiserfs_super_block *rs;
1388         int fs_blocksize;
1389
1390         bh = sb_bread(s, offset / s->s_blocksize);
1391         if (!bh) {
1392                 reiserfs_warning(s, "sh-2006: read_super_block: "
1393                                  "bread failed (dev %s, block %lu, size %lu)",
1394                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1395                                  s->s_blocksize);
1396                 return 1;
1397         }
1398
1399         rs = (struct reiserfs_super_block *)bh->b_data;
1400         if (!is_any_reiserfs_magic_string(rs)) {
1401                 brelse(bh);
1402                 return 1;
1403         }
1404         //
1405         // ok, reiserfs signature (old or new) found in at the given offset
1406         //
1407         fs_blocksize = sb_blocksize(rs);
1408         brelse(bh);
1409         sb_set_blocksize(s, fs_blocksize);
1410
1411         bh = sb_bread(s, offset / s->s_blocksize);
1412         if (!bh) {
1413                 reiserfs_warning(s, "sh-2007: read_super_block: "
1414                                  "bread failed (dev %s, block %lu, size %lu)\n",
1415                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1416                                  s->s_blocksize);
1417                 return 1;
1418         }
1419
1420         rs = (struct reiserfs_super_block *)bh->b_data;
1421         if (sb_blocksize(rs) != s->s_blocksize) {
1422                 reiserfs_warning(s, "sh-2011: read_super_block: "
1423                                  "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1424                                  reiserfs_bdevname(s),
1425                                  (unsigned long long)bh->b_blocknr,
1426                                  s->s_blocksize);
1427                 brelse(bh);
1428                 return 1;
1429         }
1430
1431         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1432                 brelse(bh);
1433                 reiserfs_warning(s,
1434                                  "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1435                                  "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1436                                  "get newer reiserfsprogs package");
1437                 return 1;
1438         }
1439
1440         SB_BUFFER_WITH_SB(s) = bh;
1441         SB_DISK_SUPER_BLOCK(s) = rs;
1442
1443         if (is_reiserfs_jr(rs)) {
1444                 /* magic is of non-standard journal filesystem, look at s_version to
1445                    find which format is in use */
1446                 if (sb_version(rs) == REISERFS_VERSION_2)
1447                         reiserfs_warning(s,
1448                                          "read_super_block: found reiserfs format \"3.6\""
1449                                          " with non-standard journal");
1450                 else if (sb_version(rs) == REISERFS_VERSION_1)
1451                         reiserfs_warning(s,
1452                                          "read_super_block: found reiserfs format \"3.5\""
1453                                          " with non-standard journal");
1454                 else {
1455                         reiserfs_warning(s,
1456                                          "sh-2012: read_super_block: found unknown "
1457                                          "format \"%u\" of reiserfs with non-standard magic",
1458                                          sb_version(rs));
1459                         return 1;
1460                 }
1461         } else
1462                 /* s_version of standard format may contain incorrect information,
1463                    so we just look at the magic string */
1464                 reiserfs_info(s,
1465                               "found reiserfs format \"%s\" with standard journal\n",
1466                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1467
1468         s->s_op = &reiserfs_sops;
1469         s->s_export_op = &reiserfs_export_ops;
1470 #ifdef CONFIG_QUOTA
1471         s->s_qcop = &reiserfs_qctl_operations;
1472         s->dq_op = &reiserfs_quota_operations;
1473 #endif
1474
1475         /* new format is limited by the 32 bit wide i_blocks field, want to
1476          ** be one full block below that.
1477          */
1478         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1479         return 0;
1480 }
1481
1482 /* after journal replay, reread all bitmap and super blocks */
1483 static int reread_meta_blocks(struct super_block *s)
1484 {
1485         int i;
1486         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1487         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1488         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1489                 reiserfs_warning(s,
1490                                  "reread_meta_blocks, error reading the super");
1491                 return 1;
1492         }
1493
1494         for (i = 0; i < SB_BMAP_NR(s); i++) {
1495                 ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i].bh));
1496                 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1497                 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1498                         reiserfs_warning(s,
1499                                          "reread_meta_blocks, error reading bitmap block number %d at %llu",
1500                                          i,
1501                                          (unsigned long long)SB_AP_BITMAP(s)[i].
1502                                          bh->b_blocknr);
1503                         return 1;
1504                 }
1505         }
1506         return 0;
1507
1508 }
1509
1510 /////////////////////////////////////////////////////
1511 // hash detection stuff
1512
1513 // if root directory is empty - we set default - Yura's - hash and
1514 // warn about it
1515 // FIXME: we look for only one name in a directory. If tea and yura
1516 // bith have the same value - we ask user to send report to the
1517 // mailing list
1518 static __u32 find_hash_out(struct super_block *s)
1519 {
1520         int retval;
1521         struct inode *inode;
1522         struct cpu_key key;
1523         INITIALIZE_PATH(path);
1524         struct reiserfs_dir_entry de;
1525         __u32 hash = DEFAULT_HASH;
1526
1527         inode = s->s_root->d_inode;
1528
1529         do {                    // Some serious "goto"-hater was there ;)
1530                 u32 teahash, r5hash, yurahash;
1531
1532                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1533                 retval = search_by_entry_key(s, &key, &path, &de);
1534                 if (retval == IO_ERROR) {
1535                         pathrelse(&path);
1536                         return UNSET_HASH;
1537                 }
1538                 if (retval == NAME_NOT_FOUND)
1539                         de.de_entry_num--;
1540                 set_de_name_and_namelen(&de);
1541                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1542                         /* allow override in this case */
1543                         if (reiserfs_rupasov_hash(s)) {
1544                                 hash = YURA_HASH;
1545                         }
1546                         reiserfs_warning(s, "FS seems to be empty, autodetect "
1547                                          "is using the default hash");
1548                         break;
1549                 }
1550                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1551                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1552                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1553                 if (((teahash == r5hash)
1554                      &&
1555                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1556                       == r5hash)) || ((teahash == yurahash)
1557                                       && (yurahash ==
1558                                           GET_HASH_VALUE(deh_offset
1559                                                          (&
1560                                                           (de.
1561                                                            de_deh[de.
1562                                                                   de_entry_num])))))
1563                     || ((r5hash == yurahash)
1564                         && (yurahash ==
1565                             GET_HASH_VALUE(deh_offset
1566                                            (&(de.de_deh[de.de_entry_num])))))) {
1567                         reiserfs_warning(s,
1568                                          "Unable to automatically detect hash function. "
1569                                          "Please mount with -o hash={tea,rupasov,r5}",
1570                                          reiserfs_bdevname(s));
1571                         hash = UNSET_HASH;
1572                         break;
1573                 }
1574                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1575                     yurahash)
1576                         hash = YURA_HASH;
1577                 else if (GET_HASH_VALUE
1578                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1579                         hash = TEA_HASH;
1580                 else if (GET_HASH_VALUE
1581                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1582                         hash = R5_HASH;
1583                 else {
1584                         reiserfs_warning(s, "Unrecognised hash function");
1585                         hash = UNSET_HASH;
1586                 }
1587         } while (0);
1588
1589         pathrelse(&path);
1590         return hash;
1591 }
1592
1593 // finds out which hash names are sorted with
1594 static int what_hash(struct super_block *s)
1595 {
1596         __u32 code;
1597
1598         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1599
1600         /* reiserfs_hash_detect() == true if any of the hash mount options
1601          ** were used.  We must check them to make sure the user isn't
1602          ** using a bad hash value
1603          */
1604         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1605                 code = find_hash_out(s);
1606
1607         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1608                 /* detection has found the hash, and we must check against the
1609                  ** mount options
1610                  */
1611                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1612                         reiserfs_warning(s, "Error, %s hash detected, "
1613                                          "unable to force rupasov hash",
1614                                          reiserfs_hashname(code));
1615                         code = UNSET_HASH;
1616                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1617                         reiserfs_warning(s, "Error, %s hash detected, "
1618                                          "unable to force tea hash",
1619                                          reiserfs_hashname(code));
1620                         code = UNSET_HASH;
1621                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1622                         reiserfs_warning(s, "Error, %s hash detected, "
1623                                          "unable to force r5 hash",
1624                                          reiserfs_hashname(code));
1625                         code = UNSET_HASH;
1626                 }
1627         } else {
1628                 /* find_hash_out was not called or could not determine the hash */
1629                 if (reiserfs_rupasov_hash(s)) {
1630                         code = YURA_HASH;
1631                 } else if (reiserfs_tea_hash(s)) {
1632                         code = TEA_HASH;
1633                 } else if (reiserfs_r5_hash(s)) {
1634                         code = R5_HASH;
1635                 }
1636         }
1637
1638         /* if we are mounted RW, and we have a new valid hash code, update
1639          ** the super
1640          */
1641         if (code != UNSET_HASH &&
1642             !(s->s_flags & MS_RDONLY) &&
1643             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1644                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1645         }
1646         return code;
1647 }
1648
1649 // return pointer to appropriate function
1650 static hashf_t hash_function(struct super_block *s)
1651 {
1652         switch (what_hash(s)) {
1653         case TEA_HASH:
1654                 reiserfs_info(s, "Using tea hash to sort names\n");
1655                 return keyed_hash;
1656         case YURA_HASH:
1657                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1658                 return yura_hash;
1659         case R5_HASH:
1660                 reiserfs_info(s, "Using r5 hash to sort names\n");
1661                 return r5_hash;
1662         }
1663         return NULL;
1664 }
1665
1666 // this is used to set up correct value for old partitions
1667 static int function2code(hashf_t func)
1668 {
1669         if (func == keyed_hash)
1670                 return TEA_HASH;
1671         if (func == yura_hash)
1672                 return YURA_HASH;
1673         if (func == r5_hash)
1674                 return R5_HASH;
1675
1676         BUG();                  // should never happen
1677
1678         return 0;
1679 }
1680
1681 #define SWARN(silent, s, ...)                   \
1682         if (!(silent))                          \
1683                 reiserfs_warning (s, __VA_ARGS__)
1684
1685 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1686 {
1687         struct inode *root_inode;
1688         int j;
1689         struct reiserfs_transaction_handle th;
1690         int old_format = 0;
1691         unsigned long blocks;
1692         unsigned int commit_max_age = 0;
1693         int jinit_done = 0;
1694         struct reiserfs_iget_args args;
1695         struct reiserfs_super_block *rs;
1696         char *jdev_name;
1697         struct reiserfs_sb_info *sbi;
1698         int errval = -EINVAL;
1699
1700         sbi = kmalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1701         if (!sbi) {
1702                 errval = -ENOMEM;
1703                 goto error;
1704         }
1705         s->s_fs_info = sbi;
1706         memset(sbi, 0, sizeof(struct reiserfs_sb_info));
1707         /* Set default values for options: non-aggressive tails, RO on errors */
1708         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1709         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1710         /* no preallocation minimum, be smart in
1711            reiserfs_file_write instead */
1712         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1713         /* Preallocate by 16 blocks (17-1) at once */
1714         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1715         /* Initialize the rwsem for xattr dir */
1716         init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1717
1718         /* setup default block allocator options */
1719         reiserfs_init_alloc_options(s);
1720
1721         jdev_name = NULL;
1722         if (reiserfs_parse_options
1723             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1724              &commit_max_age) == 0) {
1725                 goto error;
1726         }
1727
1728         if (blocks) {
1729                 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1730                       "for remount only");
1731                 goto error;
1732         }
1733
1734         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1735         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1736                 old_format = 1;
1737         /* try new format (64-th 1k block), which can contain reiserfs super block */
1738         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1739                 SWARN(silent, s,
1740                       "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1741                       reiserfs_bdevname(s));
1742                 goto error;
1743         }
1744
1745         rs = SB_DISK_SUPER_BLOCK(s);
1746         /* Let's do basic sanity check to verify that underlying device is not
1747            smaller than the filesystem. If the check fails then abort and scream,
1748            because bad stuff will happen otherwise. */
1749         if (s->s_bdev && s->s_bdev->bd_inode
1750             && i_size_read(s->s_bdev->bd_inode) <
1751             sb_block_count(rs) * sb_blocksize(rs)) {
1752                 SWARN(silent, s,
1753                       "Filesystem on %s cannot be mounted because it is bigger than the device",
1754                       reiserfs_bdevname(s));
1755                 SWARN(silent, s,
1756                       "You may need to run fsck or increase size of your LVM partition");
1757                 SWARN(silent, s,
1758                       "Or may be you forgot to reboot after fdisk when it told you to");
1759                 goto error;
1760         }
1761
1762         sbi->s_mount_state = SB_REISERFS_STATE(s);
1763         sbi->s_mount_state = REISERFS_VALID_FS;
1764
1765         if (old_format ? read_old_bitmaps(s) : read_bitmaps(s)) {
1766                 SWARN(silent, s,
1767                       "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1768                 goto error;
1769         }
1770 #ifdef CONFIG_REISERFS_CHECK
1771         SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1772         SWARN(silent, s, "- it is slow mode for debugging.");
1773 #endif
1774
1775         /* make data=ordered the default */
1776         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1777             !reiserfs_data_writeback(s)) {
1778                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1779         }
1780
1781         if (reiserfs_data_log(s)) {
1782                 reiserfs_info(s, "using journaled data mode\n");
1783         } else if (reiserfs_data_ordered(s)) {
1784                 reiserfs_info(s, "using ordered data mode\n");
1785         } else {
1786                 reiserfs_info(s, "using writeback data mode\n");
1787         }
1788         if (reiserfs_barrier_flush(s)) {
1789                 printk("reiserfs: using flush barriers\n");
1790         }
1791         // set_device_ro(s->s_dev, 1) ;
1792         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1793                 SWARN(silent, s,
1794                       "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1795                 goto error;
1796         } else {
1797                 jinit_done = 1; /* once this is set, journal_release must be called
1798                                  ** if we error out of the mount
1799                                  */
1800         }
1801         if (reread_meta_blocks(s)) {
1802                 SWARN(silent, s,
1803                       "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1804                 goto error;
1805         }
1806
1807         if (replay_only(s))
1808                 goto error;
1809
1810         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1811                 SWARN(silent, s,
1812                       "clm-7000: Detected readonly device, marking FS readonly");
1813                 s->s_flags |= MS_RDONLY;
1814         }
1815         args.objectid = REISERFS_ROOT_OBJECTID;
1816         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1817         root_inode =
1818             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1819                          reiserfs_init_locked_inode, (void *)(&args));
1820         if (!root_inode) {
1821                 SWARN(silent, s,
1822                       "jmacd-10: reiserfs_fill_super: get root inode failed");
1823                 goto error;
1824         }
1825
1826         if (root_inode->i_state & I_NEW) {
1827                 reiserfs_read_locked_inode(root_inode, &args);
1828                 unlock_new_inode(root_inode);
1829         }
1830
1831         s->s_root = d_alloc_root(root_inode);
1832         if (!s->s_root) {
1833                 iput(root_inode);
1834                 goto error;
1835         }
1836         // define and initialize hash function
1837         sbi->s_hash_function = hash_function(s);
1838         if (sbi->s_hash_function == NULL) {
1839                 dput(s->s_root);
1840                 s->s_root = NULL;
1841                 goto error;
1842         }
1843
1844         if (is_reiserfs_3_5(rs)
1845             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1846                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1847         else
1848                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1849
1850         if (!(s->s_flags & MS_RDONLY)) {
1851
1852                 errval = journal_begin(&th, s, 1);
1853                 if (errval) {
1854                         dput(s->s_root);
1855                         s->s_root = NULL;
1856                         goto error;
1857                 }
1858                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1859
1860                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1861                 set_sb_fs_state(rs, 0);
1862
1863                 if (old_format_only(s)) {
1864                         /* filesystem of format 3.5 either with standard or non-standard
1865                            journal */
1866                         if (convert_reiserfs(s)) {
1867                                 /* and -o conv is given */
1868                                 if (!silent)
1869                                         reiserfs_info(s,
1870                                                       "converting 3.5 filesystem to the 3.6 format");
1871
1872                                 if (is_reiserfs_3_5(rs))
1873                                         /* put magic string of 3.6 format. 2.2 will not be able to
1874                                            mount this filesystem anymore */
1875                                         memcpy(rs->s_v1.s_magic,
1876                                                reiserfs_3_6_magic_string,
1877                                                sizeof
1878                                                (reiserfs_3_6_magic_string));
1879
1880                                 set_sb_version(rs, REISERFS_VERSION_2);
1881                                 reiserfs_convert_objectid_map_v1(s);
1882                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1883                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1884                         } else if (!silent) {
1885                                 reiserfs_info(s, "using 3.5.x disk format\n");
1886                         }
1887                 }
1888
1889                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1890                 errval = journal_end(&th, s, 1);
1891                 if (errval) {
1892                         dput(s->s_root);
1893                         s->s_root = NULL;
1894                         goto error;
1895                 }
1896
1897                 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1898                         dput(s->s_root);
1899                         s->s_root = NULL;
1900                         goto error;
1901                 }
1902
1903                 /* look for files which were to be removed in previous session */
1904                 finish_unfinished(s);
1905         } else {
1906                 if (old_format_only(s) && !silent) {
1907                         reiserfs_info(s, "using 3.5.x disk format\n");
1908                 }
1909
1910                 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1911                         dput(s->s_root);
1912                         s->s_root = NULL;
1913                         goto error;
1914                 }
1915         }
1916         // mark hash in super block: it could be unset. overwrite should be ok
1917         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1918
1919         handle_attrs(s);
1920
1921         reiserfs_proc_info_init(s);
1922
1923         init_waitqueue_head(&(sbi->s_wait));
1924         spin_lock_init(&sbi->bitmap_lock);
1925
1926         return (0);
1927
1928       error:
1929         if (jinit_done) {       /* kill the commit thread, free journal ram */
1930                 journal_release_error(NULL, s);
1931         }
1932         if (SB_DISK_SUPER_BLOCK(s)) {
1933                 for (j = 0; j < SB_BMAP_NR(s); j++) {
1934                         if (SB_AP_BITMAP(s))
1935                                 brelse(SB_AP_BITMAP(s)[j].bh);
1936                 }
1937                 if (SB_AP_BITMAP(s))
1938                         vfree(SB_AP_BITMAP(s));
1939         }
1940         if (SB_BUFFER_WITH_SB(s))
1941                 brelse(SB_BUFFER_WITH_SB(s));
1942 #ifdef CONFIG_QUOTA
1943         for (j = 0; j < MAXQUOTAS; j++) {
1944                 if (sbi->s_qf_names[j])
1945                         kfree(sbi->s_qf_names[j]);
1946         }
1947 #endif
1948         if (sbi != NULL) {
1949                 kfree(sbi);
1950         }
1951
1952         s->s_fs_info = NULL;
1953         return errval;
1954 }
1955
1956 static int reiserfs_statfs(struct super_block *s, struct kstatfs *buf)
1957 {
1958         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1959
1960         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1961         buf->f_bfree = sb_free_blocks(rs);
1962         buf->f_bavail = buf->f_bfree;
1963         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1964         buf->f_bsize = s->s_blocksize;
1965         /* changed to accommodate gcc folks. */
1966         buf->f_type = REISERFS_SUPER_MAGIC;
1967         return 0;
1968 }
1969
1970 #ifdef CONFIG_QUOTA
1971 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1972 {
1973         struct reiserfs_transaction_handle th;
1974         int ret, err;
1975
1976         /* We may create quota structure so we need to reserve enough blocks */
1977         reiserfs_write_lock(inode->i_sb);
1978         ret =
1979             journal_begin(&th, inode->i_sb,
1980                           2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1981         if (ret)
1982                 goto out;
1983         ret = dquot_initialize(inode, type);
1984         err =
1985             journal_end(&th, inode->i_sb,
1986                         2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1987         if (!ret && err)
1988                 ret = err;
1989       out:
1990         reiserfs_write_unlock(inode->i_sb);
1991         return ret;
1992 }
1993
1994 static int reiserfs_dquot_drop(struct inode *inode)
1995 {
1996         struct reiserfs_transaction_handle th;
1997         int ret, err;
1998
1999         /* We may delete quota structure so we need to reserve enough blocks */
2000         reiserfs_write_lock(inode->i_sb);
2001         ret =
2002             journal_begin(&th, inode->i_sb,
2003                           2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
2004         if (ret)
2005                 goto out;
2006         ret = dquot_drop(inode);
2007         err =
2008             journal_end(&th, inode->i_sb,
2009                         2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
2010         if (!ret && err)
2011                 ret = err;
2012       out:
2013         reiserfs_write_unlock(inode->i_sb);
2014         return ret;
2015 }
2016
2017 static int reiserfs_write_dquot(struct dquot *dquot)
2018 {
2019         struct reiserfs_transaction_handle th;
2020         int ret, err;
2021
2022         reiserfs_write_lock(dquot->dq_sb);
2023         ret =
2024             journal_begin(&th, dquot->dq_sb,
2025                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2026         if (ret)
2027                 goto out;
2028         ret = dquot_commit(dquot);
2029         err =
2030             journal_end(&th, dquot->dq_sb,
2031                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2032         if (!ret && err)
2033                 ret = err;
2034       out:
2035         reiserfs_write_unlock(dquot->dq_sb);
2036         return ret;
2037 }
2038
2039 static int reiserfs_acquire_dquot(struct dquot *dquot)
2040 {
2041         struct reiserfs_transaction_handle th;
2042         int ret, err;
2043
2044         reiserfs_write_lock(dquot->dq_sb);
2045         ret =
2046             journal_begin(&th, dquot->dq_sb,
2047                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2048         if (ret)
2049                 goto out;
2050         ret = dquot_acquire(dquot);
2051         err =
2052             journal_end(&th, dquot->dq_sb,
2053                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2054         if (!ret && err)
2055                 ret = err;
2056       out:
2057         reiserfs_write_unlock(dquot->dq_sb);
2058         return ret;
2059 }
2060
2061 static int reiserfs_release_dquot(struct dquot *dquot)
2062 {
2063         struct reiserfs_transaction_handle th;
2064         int ret, err;
2065
2066         reiserfs_write_lock(dquot->dq_sb);
2067         ret =
2068             journal_begin(&th, dquot->dq_sb,
2069                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2070         if (ret)
2071                 goto out;
2072         ret = dquot_release(dquot);
2073         err =
2074             journal_end(&th, dquot->dq_sb,
2075                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2076         if (!ret && err)
2077                 ret = err;
2078       out:
2079         reiserfs_write_unlock(dquot->dq_sb);
2080         return ret;
2081 }
2082
2083 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2084 {
2085         /* Are we journalling quotas? */
2086         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2087             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2088                 dquot_mark_dquot_dirty(dquot);
2089                 return reiserfs_write_dquot(dquot);
2090         } else
2091                 return dquot_mark_dquot_dirty(dquot);
2092 }
2093
2094 static int reiserfs_write_info(struct super_block *sb, int type)
2095 {
2096         struct reiserfs_transaction_handle th;
2097         int ret, err;
2098
2099         /* Data block + inode block */
2100         reiserfs_write_lock(sb);
2101         ret = journal_begin(&th, sb, 2);
2102         if (ret)
2103                 goto out;
2104         ret = dquot_commit_info(sb, type);
2105         err = journal_end(&th, sb, 2);
2106         if (!ret && err)
2107                 ret = err;
2108       out:
2109         reiserfs_write_unlock(sb);
2110         return ret;
2111 }
2112
2113 /*
2114  * Turn on quotas during mount time - we need to find the quota file and such...
2115  */
2116 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2117 {
2118         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2119                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2120 }
2121
2122 /*
2123  * Standard function to be called on quota_on
2124  */
2125 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2126                              char *path)
2127 {
2128         int err;
2129         struct nameidata nd;
2130
2131         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2132                 return -EINVAL;
2133         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2134         if (err)
2135                 return err;
2136         /* Quotafile not on the same filesystem? */
2137         if (nd.mnt->mnt_sb != sb) {
2138                 path_release(&nd);
2139                 return -EXDEV;
2140         }
2141         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2142         if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
2143                 reiserfs_warning(sb,
2144                                  "reiserfs: Quota file must have tail packing disabled.");
2145                 path_release(&nd);
2146                 return -EINVAL;
2147         }
2148         /* Not journalling quota? No more tests needed... */
2149         if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
2150             !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2151                 path_release(&nd);
2152                 return vfs_quota_on(sb, type, format_id, path);
2153         }
2154         /* Quotafile not of fs root? */
2155         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2156                 reiserfs_warning(sb,
2157                                  "reiserfs: Quota file not on filesystem root. "
2158                                  "Journalled quota will not work.");
2159         path_release(&nd);
2160         return vfs_quota_on(sb, type, format_id, path);
2161 }
2162
2163 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2164  * acquiring the locks... As quota files are never truncated and quota code
2165  * itself serializes the operations (and noone else should touch the files)
2166  * we don't have to be afraid of races */
2167 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2168                                    size_t len, loff_t off)
2169 {
2170         struct inode *inode = sb_dqopt(sb)->files[type];
2171         unsigned long blk = off >> sb->s_blocksize_bits;
2172         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2173         size_t toread;
2174         struct buffer_head tmp_bh, *bh;
2175         loff_t i_size = i_size_read(inode);
2176
2177         if (off > i_size)
2178                 return 0;
2179         if (off + len > i_size)
2180                 len = i_size - off;
2181         toread = len;
2182         while (toread > 0) {
2183                 tocopy =
2184                     sb->s_blocksize - offset <
2185                     toread ? sb->s_blocksize - offset : toread;
2186                 tmp_bh.b_state = 0;
2187                 /* Quota files are without tails so we can safely use this function */
2188                 reiserfs_write_lock(sb);
2189                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2190                 reiserfs_write_unlock(sb);
2191                 if (err)
2192                         return err;
2193                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2194                         memset(data, 0, tocopy);
2195                 else {
2196                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2197                         if (!bh)
2198                                 return -EIO;
2199                         memcpy(data, bh->b_data + offset, tocopy);
2200                         brelse(bh);
2201                 }
2202                 offset = 0;
2203                 toread -= tocopy;
2204                 data += tocopy;
2205                 blk++;
2206         }
2207         return len;
2208 }
2209
2210 /* Write to quotafile (we know the transaction is already started and has
2211  * enough credits) */
2212 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2213                                     const char *data, size_t len, loff_t off)
2214 {
2215         struct inode *inode = sb_dqopt(sb)->files[type];
2216         unsigned long blk = off >> sb->s_blocksize_bits;
2217         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2218         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2219         size_t towrite = len;
2220         struct buffer_head tmp_bh, *bh;
2221
2222         down(&inode->i_sem);
2223         while (towrite > 0) {
2224                 tocopy = sb->s_blocksize - offset < towrite ?
2225                     sb->s_blocksize - offset : towrite;
2226                 tmp_bh.b_state = 0;
2227                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2228                 if (err)
2229                         goto out;
2230                 if (offset || tocopy != sb->s_blocksize)
2231                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2232                 else
2233                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2234                 if (!bh) {
2235                         err = -EIO;
2236                         goto out;
2237                 }
2238                 lock_buffer(bh);
2239                 memcpy(bh->b_data + offset, data, tocopy);
2240                 flush_dcache_page(bh->b_page);
2241                 set_buffer_uptodate(bh);
2242                 unlock_buffer(bh);
2243                 reiserfs_prepare_for_journal(sb, bh, 1);
2244                 journal_mark_dirty(current->journal_info, sb, bh);
2245                 if (!journal_quota)
2246                         reiserfs_add_ordered_list(inode, bh);
2247                 brelse(bh);
2248                 offset = 0;
2249                 towrite -= tocopy;
2250                 data += tocopy;
2251                 blk++;
2252         }
2253       out:
2254         if (len == towrite)
2255                 return err;
2256         if (inode->i_size < off + len - towrite)
2257                 i_size_write(inode, off + len - towrite);
2258         inode->i_version++;
2259         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2260         mark_inode_dirty(inode);
2261         up(&inode->i_sem);
2262         return len - towrite;
2263 }
2264
2265 #endif
2266
2267 static struct super_block *get_super_block(struct file_system_type *fs_type,
2268                                            int flags, const char *dev_name,
2269                                            void *data)
2270 {
2271         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2272 }
2273
2274 static int __init init_reiserfs_fs(void)
2275 {
2276         int ret;
2277
2278         if ((ret = init_inodecache())) {
2279                 return ret;
2280         }
2281
2282         if ((ret = reiserfs_xattr_register_handlers()))
2283                 goto failed_reiserfs_xattr_register_handlers;
2284
2285         reiserfs_proc_info_global_init();
2286         reiserfs_proc_register_global("version",
2287                                       reiserfs_global_version_in_proc);
2288
2289         ret = register_filesystem(&reiserfs_fs_type);
2290
2291         if (ret == 0) {
2292                 return 0;
2293         }
2294
2295         reiserfs_xattr_unregister_handlers();
2296
2297       failed_reiserfs_xattr_register_handlers:
2298         reiserfs_proc_unregister_global("version");
2299         reiserfs_proc_info_global_done();
2300         destroy_inodecache();
2301
2302         return ret;
2303 }
2304
2305 static void __exit exit_reiserfs_fs(void)
2306 {
2307         reiserfs_xattr_unregister_handlers();
2308         reiserfs_proc_unregister_global("version");
2309         reiserfs_proc_info_global_done();
2310         unregister_filesystem(&reiserfs_fs_type);
2311         destroy_inodecache();
2312 }
2313
2314 struct file_system_type reiserfs_fs_type = {
2315         .owner = THIS_MODULE,
2316         .name = "reiserfs",
2317         .get_sb = get_super_block,
2318         .kill_sb = kill_block_super,
2319         .fs_flags = FS_REQUIRES_DEV,
2320 };
2321
2322 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2323 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2324 MODULE_LICENSE("GPL");
2325
2326 module_init(init_reiserfs_fs);
2327 module_exit(exit_reiserfs_fs);