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/module.h>
  15 #include <linux/slab.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/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/buffer_head.h>
  25 #include <linux/exportfs.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/vfs.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.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 dentry *dentry, struct kstatfs *buf);
  64
  65 static int reiserfs_sync_fs(struct super_block *s, int wait)
  66 {
  67         struct reiserfs_transaction_handle th;
  68
  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         return 0;
  77 }
  78
  79 static void reiserfs_write_super(struct super_block *s)
  80 {
  81         reiserfs_sync_fs(s, 1);
  82 }
  83
  84 static int reiserfs_freeze(struct super_block *s)
  85 {
  86         struct reiserfs_transaction_handle th;
  87         reiserfs_write_lock(s);
  88         if (!(s->s_flags & MS_RDONLY)) {
  89                 int err = journal_begin(&th, s, 1);
  90                 if (err) {
  91                         reiserfs_block_writes(&th);
  92                 } else {
  93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  94                                                      1);
  95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  96                         reiserfs_block_writes(&th);
  97                         journal_end_sync(&th, s, 1);
  98                 }
  99         }
 100         s->s_dirt = 0;
 101         reiserfs_write_unlock(s);
 102         return 0;
 103 }
 104
 105 static int reiserfs_unfreeze(struct super_block *s)
 106 {
 107         reiserfs_allow_writes(s);
 108         return 0;
 109 }
 110
 111 extern const struct in_core_key MAX_IN_CORE_KEY;
 112
 113 /* this is used to delete "save link" when there are no items of a
 114    file it points to. It can either happen if unlink is completed but
 115    "save unlink" removal, or if file has both unlink and truncate
 116    pending and as unlink completes first (because key of "save link"
 117    protecting unlink is bigger that a key lf "save link" which
 118    protects truncate), so there left no items to make truncate
 119    completion on */
 120 static int remove_save_link_only(struct super_block *s,
 121                                  struct reiserfs_key *key, int oid_free)
 122 {
 123         struct reiserfs_transaction_handle th;
 124         int err;
 125
 126         /* we are going to do one balancing */
 127         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 128         if (err)
 129                 return err;
 130
 131         reiserfs_delete_solid_item(&th, NULL, key);
 132         if (oid_free)
 133                 /* removals are protected by direct items */
 134                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 135
 136         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 137 }
 138
 139 #ifdef CONFIG_QUOTA
 140 static int reiserfs_quota_on_mount(struct super_block *, int);
 141 #endif
 142
 143 /* look for uncompleted unlinks and truncates and complete them */
 144 static int finish_unfinished(struct super_block *s)
 145 {
 146         INITIALIZE_PATH(path);
 147         struct cpu_key max_cpu_key, obj_key;
 148         struct reiserfs_key save_link_key, last_inode_key;
 149         int retval = 0;
 150         struct item_head *ih;
 151         struct buffer_head *bh;
 152         int item_pos;
 153         char *item;
 154         int done;
 155         struct inode *inode;
 156         int truncate;
 157 #ifdef CONFIG_QUOTA
 158         int i;
 159         int ms_active_set;
 160         int quota_enabled[MAXQUOTAS];
 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         memset(&last_inode_key, 0, sizeof(last_inode_key));
 171
 172 #ifdef CONFIG_QUOTA
 173         /* Needed for iput() to work correctly and not trash data */
 174         if (s->s_flags & MS_ACTIVE) {
 175                 ms_active_set = 0;
 176         } else {
 177                 ms_active_set = 1;
 178                 s->s_flags |= MS_ACTIVE;
 179         }
 180         /* Turn on quotas so that they are updated correctly */
 181         for (i = 0; i < MAXQUOTAS; i++) {
 182                 quota_enabled[i] = 1;
 183                 if (REISERFS_SB(s)->s_qf_names[i]) {
 184                         int ret;
 185
 186                         if (sb_has_quota_active(s, i)) {
 187                                 quota_enabled[i] = 0;
 188                                 continue;
 189                         }
 190                         ret = reiserfs_quota_on_mount(s, i);
 191                         if (ret < 0)
 192                                 reiserfs_warning(s, "reiserfs-2500",
 193                                                  "cannot turn on journaled "
 194                                                  "quota: error %d", ret);
 195                 }
 196         }
 197 #endif
 198
 199         done = 0;
 200         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 201         while (!retval) {
 202                 retval = search_item(s, &max_cpu_key, &path);
 203                 if (retval != ITEM_NOT_FOUND) {
 204                         reiserfs_error(s, "vs-2140",
 205                                        "search_by_key returned %d", retval);
 206                         break;
 207                 }
 208
 209                 bh = get_last_bh(&path);
 210                 item_pos = get_item_pos(&path);
 211                 if (item_pos != B_NR_ITEMS(bh)) {
 212                         reiserfs_warning(s, "vs-2060",
 213                                          "wrong position found");
 214                         break;
 215                 }
 216                 item_pos--;
 217                 ih = B_N_PITEM_HEAD(bh, item_pos);
 218
 219                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 220                         /* there are no "save" links anymore */
 221                         break;
 222
 223                 save_link_key = ih->ih_key;
 224                 if (is_indirect_le_ih(ih))
 225                         truncate = 1;
 226                 else
 227                         truncate = 0;
 228
 229                 /* reiserfs_iget needs k_dirid and k_objectid only */
 230                 item = B_I_PITEM(bh, ih);
 231                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 232                 obj_key.on_disk_key.k_objectid =
 233                     le32_to_cpu(ih->ih_key.k_objectid);
 234                 obj_key.on_disk_key.k_offset = 0;
 235                 obj_key.on_disk_key.k_type = 0;
 236
 237                 pathrelse(&path);
 238
 239                 inode = reiserfs_iget(s, &obj_key);
 240                 if (!inode) {
 241                         /* the unlink almost completed, it just did not manage to remove
 242                            "save" link and release objectid */
 243                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 244                                          &obj_key);
 245                         retval = remove_save_link_only(s, &save_link_key, 1);
 246                         continue;
 247                 }
 248
 249                 if (!truncate && inode->i_nlink) {
 250                         /* file is not unlinked */
 251                         reiserfs_warning(s, "vs-2185",
 252                                          "file %K is not unlinked",
 253                                          &obj_key);
 254                         retval = remove_save_link_only(s, &save_link_key, 0);
 255                         continue;
 256                 }
 257                 reiserfs_write_unlock(s);
 258                 dquot_initialize(inode);
 259                 reiserfs_write_lock(s);
 260
 261                 if (truncate && S_ISDIR(inode->i_mode)) {
 262                         /* We got a truncate request for a dir which is impossible.
 263                            The only imaginable way is to execute unfinished truncate request
 264                            then boot into old kernel, remove the file and create dir with
 265                            the same key. */
 266                         reiserfs_warning(s, "green-2101",
 267                                          "impossible truncate on a "
 268                                          "directory %k. Please report",
 269                                          INODE_PKEY(inode));
 270                         retval = remove_save_link_only(s, &save_link_key, 0);
 271                         truncate = 0;
 272                         iput(inode);
 273                         continue;
 274                 }
 275
 276                 if (truncate) {
 277                         REISERFS_I(inode)->i_flags |=
 278                             i_link_saved_truncate_mask;
 279                         /* not completed truncate found. New size was committed together
 280                            with "save" link */
 281                         reiserfs_info(s, "Truncating %k to %Ld ..",
 282                                       INODE_PKEY(inode), inode->i_size);
 283                         reiserfs_truncate_file(inode,
 284                                                0
 285                                                /*don't update modification time */
 286                                                );
 287                         retval = remove_save_link(inode, truncate);
 288                 } else {
 289                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 290                         /* not completed unlink (rmdir) found */
 291                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 292                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 293                                         sizeof(last_inode_key))){
 294                                 last_inode_key = *INODE_PKEY(inode);
 295                                 /* removal gets completed in iput */
 296                                 retval = 0;
 297                         } else {
 298                                 reiserfs_warning(s, "super-2189", "Dead loop "
 299                                                  "in finish_unfinished "
 300                                                  "detected, just remove "
 301                                                  "save link\n");
 302                                 retval = remove_save_link_only(s,
 303                                                         &save_link_key, 0);
 304                         }
 305                 }
 306
 307                 iput(inode);
 308                 printk("done\n");
 309                 done++;
 310         }
 311         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 312
 313 #ifdef CONFIG_QUOTA
 314         /* Turn quotas off */
 315         for (i = 0; i < MAXQUOTAS; i++) {
 316                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 317                         dquot_quota_off(s, i);
 318         }
 319         if (ms_active_set)
 320                 /* Restore the flag back */
 321                 s->s_flags &= ~MS_ACTIVE;
 322 #endif
 323         pathrelse(&path);
 324         if (done)
 325                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 326                               "Completed\n", done);
 327         return retval;
 328 }
 329
 330 /* to protect file being unlinked from getting lost we "safe" link files
 331    being unlinked. This link will be deleted in the same transaction with last
 332    item of file. mounting the filesystem we scan all these links and remove
 333    files which almost got lost */
 334 void add_save_link(struct reiserfs_transaction_handle *th,
 335                    struct inode *inode, int truncate)
 336 {
 337         INITIALIZE_PATH(path);
 338         int retval;
 339         struct cpu_key key;
 340         struct item_head ih;
 341         __le32 link;
 342
 343         BUG_ON(!th->t_trans_id);
 344
 345         /* file can only get one "save link" of each kind */
 346         RFALSE(truncate &&
 347                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 348                "saved link already exists for truncated inode %lx",
 349                (long)inode->i_ino);
 350         RFALSE(!truncate &&
 351                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 352                "saved link already exists for unlinked inode %lx",
 353                (long)inode->i_ino);
 354
 355         /* setup key of "save" link */
 356         key.version = KEY_FORMAT_3_5;
 357         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 358         key.on_disk_key.k_objectid = inode->i_ino;
 359         if (!truncate) {
 360                 /* unlink, rmdir, rename */
 361                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 362                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 363
 364                 /* item head of "safe" link */
 365                 make_le_item_head(&ih, &key, key.version,
 366                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 367                                   4 /*length */ , 0xffff /*free space */ );
 368         } else {
 369                 /* truncate */
 370                 if (S_ISDIR(inode->i_mode))
 371                         reiserfs_warning(inode->i_sb, "green-2102",
 372                                          "Adding a truncate savelink for "
 373                                          "a directory %k! Please report",
 374                                          INODE_PKEY(inode));
 375                 set_cpu_key_k_offset(&key, 1);
 376                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 377
 378                 /* item head of "safe" link */
 379                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 380                                   4 /*length */ , 0 /*free space */ );
 381         }
 382         key.key_length = 3;
 383
 384         /* look for its place in the tree */
 385         retval = search_item(inode->i_sb, &key, &path);
 386         if (retval != ITEM_NOT_FOUND) {
 387                 if (retval != -ENOSPC)
 388                         reiserfs_error(inode->i_sb, "vs-2100",
 389                                        "search_by_key (%K) returned %d", &key,
 390                                        retval);
 391                 pathrelse(&path);
 392                 return;
 393         }
 394
 395         /* body of "save" link */
 396         link = INODE_PKEY(inode)->k_dir_id;
 397
 398         /* put "save" link into tree, don't charge quota to anyone */
 399         retval =
 400             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 401         if (retval) {
 402                 if (retval != -ENOSPC)
 403                         reiserfs_error(inode->i_sb, "vs-2120",
 404                                        "insert_item returned %d", retval);
 405         } else {
 406                 if (truncate)
 407                         REISERFS_I(inode)->i_flags |=
 408                             i_link_saved_truncate_mask;
 409                 else
 410                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 411         }
 412 }
 413
 414 /* this opens transaction unlike add_save_link */
 415 int remove_save_link(struct inode *inode, int truncate)
 416 {
 417         struct reiserfs_transaction_handle th;
 418         struct reiserfs_key key;
 419         int err;
 420
 421         /* we are going to do one balancing only */
 422         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 423         if (err)
 424                 return err;
 425
 426         /* setup key of "save" link */
 427         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 428         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 429         if (!truncate) {
 430                 /* unlink, rmdir, rename */
 431                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 432                                     1 + inode->i_sb->s_blocksize);
 433                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 434         } else {
 435                 /* truncate */
 436                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 437                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 438         }
 439
 440         if ((truncate &&
 441              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 442             (!truncate &&
 443              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 444                 /* don't take quota bytes from anywhere */
 445                 reiserfs_delete_solid_item(&th, NULL, &key);
 446         if (!truncate) {
 447                 reiserfs_release_objectid(&th, inode->i_ino);
 448                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 449         } else
 450                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 451
 452         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 453 }
 454
 455 static void reiserfs_kill_sb(struct super_block *s)
 456 {
 457         if (REISERFS_SB(s)) {
 458                 /*
 459                  * Force any pending inode evictions to occur now. Any
 460                  * inodes to be removed that have extended attributes
 461                  * associated with them need to clean them up before
 462                  * we can release the extended attribute root dentries.
 463                  * shrink_dcache_for_umount will BUG if we don't release
 464                  * those before it's called so ->put_super is too late.
 465                  */
 466                 shrink_dcache_sb(s);
 467
 468                 dput(REISERFS_SB(s)->xattr_root);
 469                 REISERFS_SB(s)->xattr_root = NULL;
 470                 dput(REISERFS_SB(s)->priv_root);
 471                 REISERFS_SB(s)->priv_root = NULL;
 472         }
 473
 474         kill_block_super(s);
 475 }
 476
 477 static void reiserfs_put_super(struct super_block *s)
 478 {
 479         struct reiserfs_transaction_handle th;
 480         th.t_trans_id = 0;
 481
 482         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 483
 484         reiserfs_write_lock(s);
 485
 486         if (s->s_dirt)
 487                 reiserfs_write_super(s);
 488
 489         /* change file system state to current state if it was mounted with read-write permissions */
 490         if (!(s->s_flags & MS_RDONLY)) {
 491                 if (!journal_begin(&th, s, 10)) {
 492                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 493                                                      1);
 494                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 495                                             REISERFS_SB(s)->s_mount_state);
 496                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 497                 }
 498         }
 499
 500         /* note, journal_release checks for readonly mount, and can decide not
 501          ** to do a journal_end
 502          */
 503         journal_release(&th, s);
 504
 505         reiserfs_free_bitmap_cache(s);
 506
 507         brelse(SB_BUFFER_WITH_SB(s));
 508
 509         print_statistics(s);
 510
 511         if (REISERFS_SB(s)->reserved_blocks != 0) {
 512                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 513                                  REISERFS_SB(s)->reserved_blocks);
 514         }
 515
 516         reiserfs_proc_info_done(s);
 517
 518         reiserfs_write_unlock(s);
 519         mutex_destroy(&REISERFS_SB(s)->lock);
 520         kfree(s->s_fs_info);
 521         s->s_fs_info = NULL;
 522 }
 523
 524 static struct kmem_cache *reiserfs_inode_cachep;
 525
 526 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 527 {
 528         struct reiserfs_inode_info *ei;
 529         ei = (struct reiserfs_inode_info *)
 530             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 531         if (!ei)
 532                 return NULL;
 533         atomic_set(&ei->openers, 0);
 534         mutex_init(&ei->tailpack);
 535         return &ei->vfs_inode;
 536 }
 537
 538 static void reiserfs_i_callback(struct rcu_head *head)
 539 {
 540         struct inode *inode = container_of(head, struct inode, i_rcu);
 541         INIT_LIST_HEAD(&inode->i_dentry);
 542         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 543 }
 544
 545 static void reiserfs_destroy_inode(struct inode *inode)
 546 {
 547         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 548 }
 549
 550 static void init_once(void *foo)
 551 {
 552         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 553
 554         INIT_LIST_HEAD(&ei->i_prealloc_list);
 555         inode_init_once(&ei->vfs_inode);
 556 }
 557
 558 static int init_inodecache(void)
 559 {
 560         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 561                                                   sizeof(struct
 562                                                          reiserfs_inode_info),
 563                                                   0, (SLAB_RECLAIM_ACCOUNT|
 564                                                         SLAB_MEM_SPREAD),
 565                                                   init_once);
 566         if (reiserfs_inode_cachep == NULL)
 567                 return -ENOMEM;
 568         return 0;
 569 }
 570
 571 static void destroy_inodecache(void)
 572 {
 573         kmem_cache_destroy(reiserfs_inode_cachep);
 574 }
 575
 576 /* we don't mark inodes dirty, we just log them */
 577 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 578 {
 579         struct reiserfs_transaction_handle th;
 580
 581         int err = 0;
 582         int lock_depth;
 583
 584         if (inode->i_sb->s_flags & MS_RDONLY) {
 585                 reiserfs_warning(inode->i_sb, "clm-6006",
 586                                  "writing inode %lu on readonly FS",
 587                                  inode->i_ino);
 588                 return;
 589         }
 590         lock_depth = reiserfs_write_lock_once(inode->i_sb);
 591
 592         /* this is really only used for atime updates, so they don't have
 593          ** to be included in O_SYNC or fsync
 594          */
 595         err = journal_begin(&th, inode->i_sb, 1);
 596         if (err)
 597                 goto out;
 598
 599         reiserfs_update_sd(&th, inode);
 600         journal_end(&th, inode->i_sb, 1);
 601
 602 out:
 603         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 604 }
 605
 606 #ifdef CONFIG_QUOTA
 607 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 608                                     size_t, loff_t);
 609 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 610                                    loff_t);
 611 #endif
 612
 613 static const struct super_operations reiserfs_sops = {
 614         .alloc_inode = reiserfs_alloc_inode,
 615         .destroy_inode = reiserfs_destroy_inode,
 616         .write_inode = reiserfs_write_inode,
 617         .dirty_inode = reiserfs_dirty_inode,
 618         .evict_inode = reiserfs_evict_inode,
 619         .put_super = reiserfs_put_super,
 620         .write_super = reiserfs_write_super,
 621         .sync_fs = reiserfs_sync_fs,
 622         .freeze_fs = reiserfs_freeze,
 623         .unfreeze_fs = reiserfs_unfreeze,
 624         .statfs = reiserfs_statfs,
 625         .remount_fs = reiserfs_remount,
 626         .show_options = generic_show_options,
 627 #ifdef CONFIG_QUOTA
 628         .quota_read = reiserfs_quota_read,
 629         .quota_write = reiserfs_quota_write,
 630 #endif
 631 };
 632
 633 #ifdef CONFIG_QUOTA
 634 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 635
 636 static int reiserfs_write_dquot(struct dquot *);
 637 static int reiserfs_acquire_dquot(struct dquot *);
 638 static int reiserfs_release_dquot(struct dquot *);
 639 static int reiserfs_mark_dquot_dirty(struct dquot *);
 640 static int reiserfs_write_info(struct super_block *, int);
 641 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 642
 643 static const struct dquot_operations reiserfs_quota_operations = {
 644         .write_dquot = reiserfs_write_dquot,
 645         .acquire_dquot = reiserfs_acquire_dquot,
 646         .release_dquot = reiserfs_release_dquot,
 647         .mark_dirty = reiserfs_mark_dquot_dirty,
 648         .write_info = reiserfs_write_info,
 649         .alloc_dquot    = dquot_alloc,
 650         .destroy_dquot  = dquot_destroy,
 651 };
 652
 653 static const struct quotactl_ops reiserfs_qctl_operations = {
 654         .quota_on = reiserfs_quota_on,
 655         .quota_off = dquot_quota_off,
 656         .quota_sync = dquot_quota_sync,
 657         .get_info = dquot_get_dqinfo,
 658         .set_info = dquot_set_dqinfo,
 659         .get_dqblk = dquot_get_dqblk,
 660         .set_dqblk = dquot_set_dqblk,
 661 };
 662 #endif
 663
 664 static const struct export_operations reiserfs_export_ops = {
 665         .encode_fh = reiserfs_encode_fh,
 666         .fh_to_dentry = reiserfs_fh_to_dentry,
 667         .fh_to_parent = reiserfs_fh_to_parent,
 668         .get_parent = reiserfs_get_parent,
 669 };
 670
 671 /* this struct is used in reiserfs_getopt () for containing the value for those
 672    mount options that have values rather than being toggles. */
 673 typedef struct {
 674         char *value;
 675         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 676                                    value is found, 0 is no bits are to be changed. */
 677         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 678                                    value is found, 0 is no bits are to be changed. This is
 679                                    applied BEFORE setmask */
 680 } arg_desc_t;
 681
 682 /* Set this bit in arg_required to allow empty arguments */
 683 #define REISERFS_OPT_ALLOWEMPTY 31
 684
 685 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 686    mount options */
 687 typedef struct {
 688         char *option_name;
 689         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 690         const arg_desc_t *values;       /* list of values accepted by an option */
 691         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 692                                    value is found, 0 is no bits are to be changed. */
 693         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 694                                    value is found, 0 is no bits are to be changed. This is
 695                                    applied BEFORE setmask */
 696 } opt_desc_t;
 697
 698 /* possible values for -o data= */
 699 static const arg_desc_t logging_mode[] = {
 700         {"ordered", 1 << REISERFS_DATA_ORDERED,
 701          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 702         {"journal", 1 << REISERFS_DATA_LOG,
 703          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 704         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 705          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 706         {.value = NULL}
 707 };
 708
 709 /* possible values for -o barrier= */
 710 static const arg_desc_t barrier_mode[] = {
 711         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 712         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 713         {.value = NULL}
 714 };
 715
 716 /* possible values for "-o block-allocator=" and bits which are to be set in
 717    s_mount_opt of reiserfs specific part of in-core super block */
 718 static const arg_desc_t balloc[] = {
 719         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 720         {"border", 0, 1 << REISERFS_NO_BORDER},
 721         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 722         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 723         {"test4", 1 << REISERFS_TEST4, 0},
 724         {"notest4", 0, 1 << REISERFS_TEST4},
 725         {NULL, 0, 0}
 726 };
 727
 728 static const arg_desc_t tails[] = {
 729         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 730         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 731         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 732         {NULL, 0, 0}
 733 };
 734
 735 static const arg_desc_t error_actions[] = {
 736         {"panic", 1 << REISERFS_ERROR_PANIC,
 737          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 738         {"ro-remount", 1 << REISERFS_ERROR_RO,
 739          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 740 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 741         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 742          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 743 #endif
 744         {NULL, 0, 0},
 745 };
 746
 747 /* proceed only one option from a list *cur - string containing of mount options
 748    opts - array of options which are accepted
 749    opt_arg - if option is found and requires an argument and if it is specifed
 750    in the input - pointer to the argument is stored here
 751    bit_flags - if option requires to set a certain bit - it is set here
 752    return -1 if unknown option is found, opt->arg_required otherwise */
 753 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 754                            char **opt_arg, unsigned long *bit_flags)
 755 {
 756         char *p;
 757         /* foo=bar,
 758            ^   ^  ^
 759            |   |  +-- option_end
 760            |   +-- arg_start
 761            +-- option_start
 762          */
 763         const opt_desc_t *opt;
 764         const arg_desc_t *arg;
 765
 766         p = *cur;
 767
 768         /* assume argument cannot contain commas */
 769         *cur = strchr(p, ',');
 770         if (*cur) {
 771                 *(*cur) = '\0';
 772                 (*cur)++;
 773         }
 774
 775         if (!strncmp(p, "alloc=", 6)) {
 776                 /* Ugly special case, probably we should redo options parser so that
 777                    it can understand several arguments for some options, also so that
 778                    it can fill several bitfields with option values. */
 779                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 780                         return -1;
 781                 } else {
 782                         return 0;
 783                 }
 784         }
 785
 786         /* for every option in the list */
 787         for (opt = opts; opt->option_name; opt++) {
 788                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 789                         if (bit_flags) {
 790                                 if (opt->clrmask ==
 791                                     (1 << REISERFS_UNSUPPORTED_OPT))
 792                                         reiserfs_warning(s, "super-6500",
 793                                                          "%s not supported.\n",
 794                                                          p);
 795                                 else
 796                                         *bit_flags &= ~opt->clrmask;
 797                                 if (opt->setmask ==
 798                                     (1 << REISERFS_UNSUPPORTED_OPT))
 799                                         reiserfs_warning(s, "super-6501",
 800                                                          "%s not supported.\n",
 801                                                          p);
 802                                 else
 803                                         *bit_flags |= opt->setmask;
 804                         }
 805                         break;
 806                 }
 807         }
 808         if (!opt->option_name) {
 809                 reiserfs_warning(s, "super-6502",
 810                                  "unknown mount option \"%s\"", p);
 811                 return -1;
 812         }
 813
 814         p += strlen(opt->option_name);
 815         switch (*p) {
 816         case '=':
 817                 if (!opt->arg_required) {
 818                         reiserfs_warning(s, "super-6503",
 819                                          "the option \"%s\" does not "
 820                                          "require an argument\n",
 821                                          opt->option_name);
 822                         return -1;
 823                 }
 824                 break;
 825
 826         case 0:
 827                 if (opt->arg_required) {
 828                         reiserfs_warning(s, "super-6504",
 829                                          "the option \"%s\" requires an "
 830                                          "argument\n", opt->option_name);
 831                         return -1;
 832                 }
 833                 break;
 834         default:
 835                 reiserfs_warning(s, "super-6505",
 836                                  "head of option \"%s\" is only correct\n",
 837                                  opt->option_name);
 838                 return -1;
 839         }
 840
 841         /* move to the argument, or to next option if argument is not required */
 842         p++;
 843
 844         if (opt->arg_required
 845             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 846             && !strlen(p)) {
 847                 /* this catches "option=," if not allowed */
 848                 reiserfs_warning(s, "super-6506",
 849                                  "empty argument for \"%s\"\n",
 850                                  opt->option_name);
 851                 return -1;
 852         }
 853
 854         if (!opt->values) {
 855                 /* *=NULLopt_arg contains pointer to argument */
 856                 *opt_arg = p;
 857                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 858         }
 859
 860         /* values possible for this option are listed in opt->values */
 861         for (arg = opt->values; arg->value; arg++) {
 862                 if (!strcmp(p, arg->value)) {
 863                         if (bit_flags) {
 864                                 *bit_flags &= ~arg->clrmask;
 865                                 *bit_flags |= arg->setmask;
 866                         }
 867                         return opt->arg_required;
 868                 }
 869         }
 870
 871         reiserfs_warning(s, "super-6506",
 872                          "bad value \"%s\" for option \"%s\"\n", p,
 873                          opt->option_name);
 874         return -1;
 875 }
 876
 877 /* returns 0 if something is wrong in option string, 1 - otherwise */
 878 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 879                                   unsigned long *mount_options,
 880                                   /* after the parsing phase, contains the
 881                                      collection of bitflags defining what
 882                                      mount options were selected. */
 883                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 884                                   char **jdev_name,
 885                                   unsigned int *commit_max_age,
 886                                   char **qf_names,
 887                                   unsigned int *qfmt)
 888 {
 889         int c;
 890         char *arg = NULL;
 891         char *pos;
 892         opt_desc_t opts[] = {
 893                 /* Compatibility stuff, so that -o notail for old setups still work */
 894                 {"tails",.arg_required = 't',.values = tails},
 895                 {"notail",.clrmask =
 896                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 897                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 898                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 899                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 900                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 901 #ifdef CONFIG_REISERFS_FS_XATTR
 902                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 903                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 904 #else
 905                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 906                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 907 #endif
 908 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 909                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 910                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 911 #else
 912                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 913                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 914 #endif
 915                 {.option_name = "nolog"},
 916                 {"replayonly",.setmask = 1 << REPLAYONLY},
 917                 {"block-allocator",.arg_required = 'a',.values = balloc},
 918                 {"data",.arg_required = 'd',.values = logging_mode},
 919                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 920                 {"resize",.arg_required = 'r',.values = NULL},
 921                 {"jdev",.arg_required = 'j',.values = NULL},
 922                 {"nolargeio",.arg_required = 'w',.values = NULL},
 923                 {"commit",.arg_required = 'c',.values = NULL},
 924                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 925                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 926                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 927                 {"errors",.arg_required = 'e',.values = error_actions},
 928                 {"usrjquota",.arg_required =
 929                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 930                 {"grpjquota",.arg_required =
 931                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 932                 {"jqfmt",.arg_required = 'f',.values = NULL},
 933                 {.option_name = NULL}
 934         };
 935
 936         *blocks = 0;
 937         if (!options || !*options)
 938                 /* use default configuration: create tails, journaling on, no
 939                    conversion to newest format */
 940                 return 1;
 941
 942         for (pos = options; pos;) {
 943                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 944                 if (c == -1)
 945                         /* wrong option is given */
 946                         return 0;
 947
 948                 if (c == 'r') {
 949                         char *p;
 950
 951                         p = NULL;
 952                         /* "resize=NNN" or "resize=auto" */
 953
 954                         if (!strcmp(arg, "auto")) {
 955                                 /* From JFS code, to auto-get the size. */
 956                                 *blocks =
 957                                     s->s_bdev->bd_inode->i_size >> s->
 958                                     s_blocksize_bits;
 959                         } else {
 960                                 *blocks = simple_strtoul(arg, &p, 0);
 961                                 if (*p != '\0') {
 962                                         /* NNN does not look like a number */
 963                                         reiserfs_warning(s, "super-6507",
 964                                                          "bad value %s for "
 965                                                          "-oresize\n", arg);
 966                                         return 0;
 967                                 }
 968                         }
 969                 }
 970
 971                 if (c == 'c') {
 972                         char *p = NULL;
 973                         unsigned long val = simple_strtoul(arg, &p, 0);
 974                         /* commit=NNN (time in seconds) */
 975                         if (*p != '\0' || val >= (unsigned int)-1) {
 976                                 reiserfs_warning(s, "super-6508",
 977                                                  "bad value %s for -ocommit\n",
 978                                                  arg);
 979                                 return 0;
 980                         }
 981                         *commit_max_age = (unsigned int)val;
 982                 }
 983
 984                 if (c == 'w') {
 985                         reiserfs_warning(s, "super-6509", "nolargeio option "
 986                                          "is no longer supported");
 987                         return 0;
 988                 }
 989
 990                 if (c == 'j') {
 991                         if (arg && *arg && jdev_name) {
 992                                 if (*jdev_name) {       //Hm, already assigned?
 993                                         reiserfs_warning(s, "super-6510",
 994                                                          "journal device was "
 995                                                          "already specified to "
 996                                                          "be %s", *jdev_name);
 997                                         return 0;
 998                                 }
 999                                 *jdev_name = arg;
1000                         }
1001                 }
1002 #ifdef CONFIG_QUOTA
1003                 if (c == 'u' || c == 'g') {
1004                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1005
1006                         if (sb_any_quota_loaded(s) &&
1007                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1008                                 reiserfs_warning(s, "super-6511",
1009                                                  "cannot change journaled "
1010                                                  "quota options when quota "
1011                                                  "turned on.");
1012                                 return 0;
1013                         }
1014                         if (*arg) {     /* Some filename specified? */
1015                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1016                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1017                                               arg)) {
1018                                         reiserfs_warning(s, "super-6512",
1019                                                          "%s quota file "
1020                                                          "already specified.",
1021                                                          QTYPE2NAME(qtype));
1022                                         return 0;
1023                                 }
1024                                 if (strchr(arg, '/')) {
1025                                         reiserfs_warning(s, "super-6513",
1026                                                          "quotafile must be "
1027                                                          "on filesystem root.");
1028                                         return 0;
1029                                 }
1030                                 qf_names[qtype] =
1031                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1032                                 if (!qf_names[qtype]) {
1033                                         reiserfs_warning(s, "reiserfs-2502",
1034                                                          "not enough memory "
1035                                                          "for storing "
1036                                                          "quotafile name.");
1037                                         return 0;
1038                                 }
1039                                 strcpy(qf_names[qtype], arg);
1040                                 *mount_options |= 1 << REISERFS_QUOTA;
1041                         } else {
1042                                 if (qf_names[qtype] !=
1043                                     REISERFS_SB(s)->s_qf_names[qtype])
1044                                         kfree(qf_names[qtype]);
1045                                 qf_names[qtype] = NULL;
1046                         }
1047                 }
1048                 if (c == 'f') {
1049                         if (!strcmp(arg, "vfsold"))
1050                                 *qfmt = QFMT_VFS_OLD;
1051                         else if (!strcmp(arg, "vfsv0"))
1052                                 *qfmt = QFMT_VFS_V0;
1053                         else {
1054                                 reiserfs_warning(s, "super-6514",
1055                                                  "unknown quota format "
1056                                                  "specified.");
1057                                 return 0;
1058                         }
1059                         if (sb_any_quota_loaded(s) &&
1060                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1061                                 reiserfs_warning(s, "super-6515",
1062                                                  "cannot change journaled "
1063                                                  "quota options when quota "
1064                                                  "turned on.");
1065                                 return 0;
1066                         }
1067                 }
1068 #else
1069                 if (c == 'u' || c == 'g' || c == 'f') {
1070                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1071                                          "quota options not supported.");
1072                         return 0;
1073                 }
1074 #endif
1075         }
1076
1077 #ifdef CONFIG_QUOTA
1078         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1079             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1080                 reiserfs_warning(s, "super-6515",
1081                                  "journaled quota format not specified.");
1082                 return 0;
1083         }
1084         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1085         if (!(*mount_options & (1 << REISERFS_QUOTA))
1086             && sb_any_quota_loaded(s)) {
1087                 reiserfs_warning(s, "super-6516", "quota options must "
1088                                  "be present when quota is turned on.");
1089                 return 0;
1090         }
1091 #endif
1092
1093         return 1;
1094 }
1095
1096 static void switch_data_mode(struct super_block *s, unsigned long mode)
1097 {
1098         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1099                                          (1 << REISERFS_DATA_ORDERED) |
1100                                          (1 << REISERFS_DATA_WRITEBACK));
1101         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1102 }
1103
1104 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1105 {
1106         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1107                 if (!reiserfs_data_log(s)) {
1108                         switch_data_mode(s, REISERFS_DATA_LOG);
1109                         reiserfs_info(s, "switching to journaled data mode\n");
1110                 }
1111         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1112                 if (!reiserfs_data_ordered(s)) {
1113                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1114                         reiserfs_info(s, "switching to ordered data mode\n");
1115                 }
1116         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1117                 if (!reiserfs_data_writeback(s)) {
1118                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1119                         reiserfs_info(s, "switching to writeback data mode\n");
1120                 }
1121         }
1122 }
1123
1124 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1125 {
1126         int flush = (1 << REISERFS_BARRIER_FLUSH);
1127         int none = (1 << REISERFS_BARRIER_NONE);
1128         int all_barrier = flush | none;
1129
1130         if (bits & all_barrier) {
1131                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1132                 if (bits & flush) {
1133                         REISERFS_SB(s)->s_mount_opt |= flush;
1134                         printk("reiserfs: enabling write barrier flush mode\n");
1135                 } else if (bits & none) {
1136                         REISERFS_SB(s)->s_mount_opt |= none;
1137                         printk("reiserfs: write barriers turned off\n");
1138                 }
1139         }
1140 }
1141
1142 static void handle_attrs(struct super_block *s)
1143 {
1144         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1145
1146         if (reiserfs_attrs(s)) {
1147                 if (old_format_only(s)) {
1148                         reiserfs_warning(s, "super-6517", "cannot support "
1149                                          "attributes on 3.5.x disk format");
1150                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1151                         return;
1152                 }
1153                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1154                         reiserfs_warning(s, "super-6518", "cannot support "
1155                                          "attributes until flag is set in "
1156                                          "super-block");
1157                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1158                 }
1159         }
1160 }
1161
1162 #ifdef CONFIG_QUOTA
1163 static void handle_quota_files(struct super_block *s, char **qf_names,
1164                                unsigned int *qfmt)
1165 {
1166         int i;
1167
1168         for (i = 0; i < MAXQUOTAS; i++) {
1169                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1170                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1171                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1172         }
1173         if (*qfmt)
1174                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1175 }
1176 #endif
1177
1178 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1179 {
1180         struct reiserfs_super_block *rs;
1181         struct reiserfs_transaction_handle th;
1182         unsigned long blocks;
1183         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1184         unsigned long safe_mask = 0;
1185         unsigned int commit_max_age = (unsigned int)-1;
1186         struct reiserfs_journal *journal = SB_JOURNAL(s);
1187         char *new_opts = kstrdup(arg, GFP_KERNEL);
1188         int err;
1189         char *qf_names[MAXQUOTAS];
1190         unsigned int qfmt = 0;
1191 #ifdef CONFIG_QUOTA
1192         int i;
1193 #endif
1194
1195         reiserfs_write_lock(s);
1196
1197 #ifdef CONFIG_QUOTA
1198         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1199 #endif
1200
1201         rs = SB_DISK_SUPER_BLOCK(s);
1202
1203         if (!reiserfs_parse_options
1204             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1205             qf_names, &qfmt)) {
1206 #ifdef CONFIG_QUOTA
1207                 for (i = 0; i < MAXQUOTAS; i++)
1208                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1209                                 kfree(qf_names[i]);
1210 #endif
1211                 err = -EINVAL;
1212                 goto out_unlock;
1213         }
1214 #ifdef CONFIG_QUOTA
1215         handle_quota_files(s, qf_names, &qfmt);
1216 #endif
1217
1218         handle_attrs(s);
1219
1220         /* Add options that are safe here */
1221         safe_mask |= 1 << REISERFS_SMALLTAIL;
1222         safe_mask |= 1 << REISERFS_LARGETAIL;
1223         safe_mask |= 1 << REISERFS_NO_BORDER;
1224         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1225         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1226         safe_mask |= 1 << REISERFS_TEST4;
1227         safe_mask |= 1 << REISERFS_ATTRS;
1228         safe_mask |= 1 << REISERFS_XATTRS_USER;
1229         safe_mask |= 1 << REISERFS_POSIXACL;
1230         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1231         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1232         safe_mask |= 1 << REISERFS_ERROR_RO;
1233         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1234         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1235         safe_mask |= 1 << REISERFS_QUOTA;
1236
1237         /* Update the bitmask, taking care to keep
1238          * the bits we're not allowed to change here */
1239         REISERFS_SB(s)->s_mount_opt =
1240             (REISERFS_SB(s)->
1241              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1242
1243         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1244                 journal->j_max_commit_age = commit_max_age;
1245                 journal->j_max_trans_age = commit_max_age;
1246         } else if (commit_max_age == 0) {
1247                 /* 0 means restore defaults. */
1248                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1249                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1250         }
1251
1252         if (blocks) {
1253                 err = reiserfs_resize(s, blocks);
1254                 if (err != 0)
1255                         goto out_unlock;
1256         }
1257
1258         if (*mount_flags & MS_RDONLY) {
1259                 reiserfs_xattr_init(s, *mount_flags);
1260                 /* remount read-only */
1261                 if (s->s_flags & MS_RDONLY)
1262                         /* it is read-only already */
1263                         goto out_ok;
1264
1265                 /*
1266                  * Drop write lock. Quota will retake it when needed and lock
1267                  * ordering requires calling dquot_suspend() without it.
1268                  */
1269                 reiserfs_write_unlock(s);
1270                 err = dquot_suspend(s, -1);
1271                 if (err < 0)
1272                         goto out_err;
1273                 reiserfs_write_lock(s);
1274
1275                 /* try to remount file system with read-only permissions */
1276                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1277                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1278                         goto out_ok;
1279                 }
1280
1281                 err = journal_begin(&th, s, 10);
1282                 if (err)
1283                         goto out_unlock;
1284
1285                 /* Mounting a rw partition read-only. */
1286                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1287                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1288                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1289         } else {
1290                 /* remount read-write */
1291                 if (!(s->s_flags & MS_RDONLY)) {
1292                         reiserfs_xattr_init(s, *mount_flags);
1293                         goto out_ok;    /* We are read-write already */
1294                 }
1295
1296                 if (reiserfs_is_journal_aborted(journal)) {
1297                         err = journal->j_errno;
1298                         goto out_unlock;
1299                 }
1300
1301                 handle_data_mode(s, mount_options);
1302                 handle_barrier_mode(s, mount_options);
1303                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1304                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1305                 err = journal_begin(&th, s, 10);
1306                 if (err)
1307                         goto out_unlock;
1308
1309                 /* Mount a partition which is read-only, read-write */
1310                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1311                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1312                 s->s_flags &= ~MS_RDONLY;
1313                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1314                 if (!old_format_only(s))
1315                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1316                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1317                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1318                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1319         }
1320         /* this will force a full flush of all journal lists */
1321         SB_JOURNAL(s)->j_must_wait = 1;
1322         err = journal_end(&th, s, 10);
1323         if (err)
1324                 goto out_unlock;
1325         s->s_dirt = 0;
1326
1327         if (!(*mount_flags & MS_RDONLY)) {
1328                 /*
1329                  * Drop write lock. Quota will retake it when needed and lock
1330                  * ordering requires calling dquot_resume() without it.
1331                  */
1332                 reiserfs_write_unlock(s);
1333                 dquot_resume(s, -1);
1334                 reiserfs_write_lock(s);
1335                 finish_unfinished(s);
1336                 reiserfs_xattr_init(s, *mount_flags);
1337         }
1338
1339 out_ok:
1340         replace_mount_options(s, new_opts);
1341         reiserfs_write_unlock(s);
1342         return 0;
1343
1344 out_unlock:
1345         reiserfs_write_unlock(s);
1346 out_err:
1347         kfree(new_opts);
1348         return err;
1349 }
1350
1351 static int read_super_block(struct super_block *s, int offset)
1352 {
1353         struct buffer_head *bh;
1354         struct reiserfs_super_block *rs;
1355         int fs_blocksize;
1356
1357         bh = sb_bread(s, offset / s->s_blocksize);
1358         if (!bh) {
1359                 reiserfs_warning(s, "sh-2006",
1360                                  "bread failed (dev %s, block %lu, size %lu)",
1361                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1362                                  s->s_blocksize);
1363                 return 1;
1364         }
1365
1366         rs = (struct reiserfs_super_block *)bh->b_data;
1367         if (!is_any_reiserfs_magic_string(rs)) {
1368                 brelse(bh);
1369                 return 1;
1370         }
1371         //
1372         // ok, reiserfs signature (old or new) found in at the given offset
1373         //
1374         fs_blocksize = sb_blocksize(rs);
1375         brelse(bh);
1376         sb_set_blocksize(s, fs_blocksize);
1377
1378         bh = sb_bread(s, offset / s->s_blocksize);
1379         if (!bh) {
1380                 reiserfs_warning(s, "sh-2007",
1381                                  "bread failed (dev %s, block %lu, size %lu)",
1382                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1383                                  s->s_blocksize);
1384                 return 1;
1385         }
1386
1387         rs = (struct reiserfs_super_block *)bh->b_data;
1388         if (sb_blocksize(rs) != s->s_blocksize) {
1389                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1390                                  "filesystem on (dev %s, block %Lu, size %lu)",
1391                                  reiserfs_bdevname(s),
1392                                  (unsigned long long)bh->b_blocknr,
1393                                  s->s_blocksize);
1394                 brelse(bh);
1395                 return 1;
1396         }
1397
1398         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1399                 brelse(bh);
1400                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1401                                  "--rebuild-tree run detected. Please run\n"
1402                                  "reiserfsck --rebuild-tree and wait for a "
1403                                  "completion. If that fails\n"
1404                                  "get newer reiserfsprogs package");
1405                 return 1;
1406         }
1407
1408         SB_BUFFER_WITH_SB(s) = bh;
1409         SB_DISK_SUPER_BLOCK(s) = rs;
1410
1411         if (is_reiserfs_jr(rs)) {
1412                 /* magic is of non-standard journal filesystem, look at s_version to
1413                    find which format is in use */
1414                 if (sb_version(rs) == REISERFS_VERSION_2)
1415                         reiserfs_info(s, "found reiserfs format \"3.6\""
1416                                       " with non-standard journal\n");
1417                 else if (sb_version(rs) == REISERFS_VERSION_1)
1418                         reiserfs_info(s, "found reiserfs format \"3.5\""
1419                                       " with non-standard journal\n");
1420                 else {
1421                         reiserfs_warning(s, "sh-2012", "found unknown "
1422                                          "format \"%u\" of reiserfs with "
1423                                          "non-standard magic", sb_version(rs));
1424                         return 1;
1425                 }
1426         } else
1427                 /* s_version of standard format may contain incorrect information,
1428                    so we just look at the magic string */
1429                 reiserfs_info(s,
1430                               "found reiserfs format \"%s\" with standard journal\n",
1431                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1432
1433         s->s_op = &reiserfs_sops;
1434         s->s_export_op = &reiserfs_export_ops;
1435 #ifdef CONFIG_QUOTA
1436         s->s_qcop = &reiserfs_qctl_operations;
1437         s->dq_op = &reiserfs_quota_operations;
1438 #endif
1439
1440         /* new format is limited by the 32 bit wide i_blocks field, want to
1441          ** be one full block below that.
1442          */
1443         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1444         return 0;
1445 }
1446
1447 /* after journal replay, reread all bitmap and super blocks */
1448 static int reread_meta_blocks(struct super_block *s)
1449 {
1450         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1451         reiserfs_write_unlock(s);
1452         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1453         reiserfs_write_lock(s);
1454         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1455                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1456                 return 1;
1457         }
1458
1459         return 0;
1460 }
1461
1462 /////////////////////////////////////////////////////
1463 // hash detection stuff
1464
1465 // if root directory is empty - we set default - Yura's - hash and
1466 // warn about it
1467 // FIXME: we look for only one name in a directory. If tea and yura
1468 // bith have the same value - we ask user to send report to the
1469 // mailing list
1470 static __u32 find_hash_out(struct super_block *s)
1471 {
1472         int retval;
1473         struct inode *inode;
1474         struct cpu_key key;
1475         INITIALIZE_PATH(path);
1476         struct reiserfs_dir_entry de;
1477         __u32 hash = DEFAULT_HASH;
1478
1479         inode = s->s_root->d_inode;
1480
1481         do {                    // Some serious "goto"-hater was there ;)
1482                 u32 teahash, r5hash, yurahash;
1483
1484                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1485                 retval = search_by_entry_key(s, &key, &path, &de);
1486                 if (retval == IO_ERROR) {
1487                         pathrelse(&path);
1488                         return UNSET_HASH;
1489                 }
1490                 if (retval == NAME_NOT_FOUND)
1491                         de.de_entry_num--;
1492                 set_de_name_and_namelen(&de);
1493                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1494                         /* allow override in this case */
1495                         if (reiserfs_rupasov_hash(s)) {
1496                                 hash = YURA_HASH;
1497                         }
1498                         reiserfs_info(s, "FS seems to be empty, autodetect "
1499                                          "is using the default hash\n");
1500                         break;
1501                 }
1502                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1503                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1504                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1505                 if (((teahash == r5hash)
1506                      &&
1507                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1508                       == r5hash)) || ((teahash == yurahash)
1509                                       && (yurahash ==
1510                                           GET_HASH_VALUE(deh_offset
1511                                                          (&
1512                                                           (de.
1513                                                            de_deh[de.
1514                                                                   de_entry_num])))))
1515                     || ((r5hash == yurahash)
1516                         && (yurahash ==
1517                             GET_HASH_VALUE(deh_offset
1518                                            (&(de.de_deh[de.de_entry_num])))))) {
1519                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1520                                          "automatically detect hash function. "
1521                                          "Please mount with -o "
1522                                          "hash={tea,rupasov,r5}");
1523                         hash = UNSET_HASH;
1524                         break;
1525                 }
1526                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1527                     yurahash)
1528                         hash = YURA_HASH;
1529                 else if (GET_HASH_VALUE
1530                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1531                         hash = TEA_HASH;
1532                 else if (GET_HASH_VALUE
1533                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1534                         hash = R5_HASH;
1535                 else {
1536                         reiserfs_warning(s, "reiserfs-2506",
1537                                          "Unrecognised hash function");
1538                         hash = UNSET_HASH;
1539                 }
1540         } while (0);
1541
1542         pathrelse(&path);
1543         return hash;
1544 }
1545
1546 // finds out which hash names are sorted with
1547 static int what_hash(struct super_block *s)
1548 {
1549         __u32 code;
1550
1551         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1552
1553         /* reiserfs_hash_detect() == true if any of the hash mount options
1554          ** were used.  We must check them to make sure the user isn't
1555          ** using a bad hash value
1556          */
1557         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1558                 code = find_hash_out(s);
1559
1560         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1561                 /* detection has found the hash, and we must check against the
1562                  ** mount options
1563                  */
1564                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1565                         reiserfs_warning(s, "reiserfs-2507",
1566                                          "Error, %s hash detected, "
1567                                          "unable to force rupasov hash",
1568                                          reiserfs_hashname(code));
1569                         code = UNSET_HASH;
1570                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1571                         reiserfs_warning(s, "reiserfs-2508",
1572                                          "Error, %s hash detected, "
1573                                          "unable to force tea hash",
1574                                          reiserfs_hashname(code));
1575                         code = UNSET_HASH;
1576                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1577                         reiserfs_warning(s, "reiserfs-2509",
1578                                          "Error, %s hash detected, "
1579                                          "unable to force r5 hash",
1580                                          reiserfs_hashname(code));
1581                         code = UNSET_HASH;
1582                 }
1583         } else {
1584                 /* find_hash_out was not called or could not determine the hash */
1585                 if (reiserfs_rupasov_hash(s)) {
1586                         code = YURA_HASH;
1587                 } else if (reiserfs_tea_hash(s)) {
1588                         code = TEA_HASH;
1589                 } else if (reiserfs_r5_hash(s)) {
1590                         code = R5_HASH;
1591                 }
1592         }
1593
1594         /* if we are mounted RW, and we have a new valid hash code, update
1595          ** the super
1596          */
1597         if (code != UNSET_HASH &&
1598             !(s->s_flags & MS_RDONLY) &&
1599             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1600                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1601         }
1602         return code;
1603 }
1604
1605 // return pointer to appropriate function
1606 static hashf_t hash_function(struct super_block *s)
1607 {
1608         switch (what_hash(s)) {
1609         case TEA_HASH:
1610                 reiserfs_info(s, "Using tea hash to sort names\n");
1611                 return keyed_hash;
1612         case YURA_HASH:
1613                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1614                 return yura_hash;
1615         case R5_HASH:
1616                 reiserfs_info(s, "Using r5 hash to sort names\n");
1617                 return r5_hash;
1618         }
1619         return NULL;
1620 }
1621
1622 // this is used to set up correct value for old partitions
1623 static int function2code(hashf_t func)
1624 {
1625         if (func == keyed_hash)
1626                 return TEA_HASH;
1627         if (func == yura_hash)
1628                 return YURA_HASH;
1629         if (func == r5_hash)
1630                 return R5_HASH;
1631
1632         BUG();                  // should never happen
1633
1634         return 0;
1635 }
1636
1637 #define SWARN(silent, s, id, ...)                       \
1638         if (!(silent))                          \
1639                 reiserfs_warning(s, id, __VA_ARGS__)
1640
1641 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1642 {
1643         struct inode *root_inode;
1644         struct reiserfs_transaction_handle th;
1645         int old_format = 0;
1646         unsigned long blocks;
1647         unsigned int commit_max_age = 0;
1648         int jinit_done = 0;
1649         struct reiserfs_iget_args args;
1650         struct reiserfs_super_block *rs;
1651         char *jdev_name;
1652         struct reiserfs_sb_info *sbi;
1653         int errval = -EINVAL;
1654         char *qf_names[MAXQUOTAS] = {};
1655         unsigned int qfmt = 0;
1656
1657         save_mount_options(s, data);
1658
1659         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1660         if (!sbi)
1661                 return -ENOMEM;
1662         s->s_fs_info = sbi;
1663         /* Set default values for options: non-aggressive tails, RO on errors */
1664         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1665         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1666         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1667         /* no preallocation minimum, be smart in
1668            reiserfs_file_write instead */
1669         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1670         /* Preallocate by 16 blocks (17-1) at once */
1671         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1672         /* setup default block allocator options */
1673         reiserfs_init_alloc_options(s);
1674
1675         mutex_init(&REISERFS_SB(s)->lock);
1676         REISERFS_SB(s)->lock_depth = -1;
1677
1678         /*
1679          * This function is called with the bkl, which also was the old
1680          * locking used here.
1681          * do_journal_begin() will soon check if we hold the lock (ie: was the
1682          * bkl). This is likely because do_journal_begin() has several another
1683          * callers because at this time, it doesn't seem to be necessary to
1684          * protect against anything.
1685          * Anyway, let's be conservative and lock for now.
1686          */
1687         reiserfs_write_lock(s);
1688
1689         jdev_name = NULL;
1690         if (reiserfs_parse_options
1691             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1692              &commit_max_age, qf_names, &qfmt) == 0) {
1693                 goto error;
1694         }
1695 #ifdef CONFIG_QUOTA
1696         handle_quota_files(s, qf_names, &qfmt);
1697 #endif
1698
1699         if (blocks) {
1700                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1701                 goto error;
1702         }
1703
1704         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1705         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1706                 old_format = 1;
1707         /* try new format (64-th 1k block), which can contain reiserfs super block */
1708         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1709                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1710                       reiserfs_bdevname(s));
1711                 goto error;
1712         }
1713
1714         rs = SB_DISK_SUPER_BLOCK(s);
1715         /* Let's do basic sanity check to verify that underlying device is not
1716            smaller than the filesystem. If the check fails then abort and scream,
1717            because bad stuff will happen otherwise. */
1718         if (s->s_bdev && s->s_bdev->bd_inode
1719             && i_size_read(s->s_bdev->bd_inode) <
1720             sb_block_count(rs) * sb_blocksize(rs)) {
1721                 SWARN(silent, s, "", "Filesystem cannot be "
1722                       "mounted because it is bigger than the device");
1723                 SWARN(silent, s, "", "You may need to run fsck "
1724                       "or increase size of your LVM partition");
1725                 SWARN(silent, s, "", "Or may be you forgot to "
1726                       "reboot after fdisk when it told you to");
1727                 goto error;
1728         }
1729
1730         sbi->s_mount_state = SB_REISERFS_STATE(s);
1731         sbi->s_mount_state = REISERFS_VALID_FS;
1732
1733         if ((errval = reiserfs_init_bitmap_cache(s))) {
1734                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1735                 goto error;
1736         }
1737         errval = -EINVAL;
1738 #ifdef CONFIG_REISERFS_CHECK
1739         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1740         SWARN(silent, s, "", "- it is slow mode for debugging.");
1741 #endif
1742
1743         /* make data=ordered the default */
1744         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1745             !reiserfs_data_writeback(s)) {
1746                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1747         }
1748
1749         if (reiserfs_data_log(s)) {
1750                 reiserfs_info(s, "using journaled data mode\n");
1751         } else if (reiserfs_data_ordered(s)) {
1752                 reiserfs_info(s, "using ordered data mode\n");
1753         } else {
1754                 reiserfs_info(s, "using writeback data mode\n");
1755         }
1756         if (reiserfs_barrier_flush(s)) {
1757                 printk("reiserfs: using flush barriers\n");
1758         }
1759         // set_device_ro(s->s_dev, 1) ;
1760         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1761                 SWARN(silent, s, "sh-2022",
1762                       "unable to initialize journal space");
1763                 goto error;
1764         } else {
1765                 jinit_done = 1; /* once this is set, journal_release must be called
1766                                  ** if we error out of the mount
1767                                  */
1768         }
1769         if (reread_meta_blocks(s)) {
1770                 SWARN(silent, s, "jmacd-9",
1771                       "unable to reread meta blocks after journal init");
1772                 goto error;
1773         }
1774
1775         if (replay_only(s))
1776                 goto error;
1777
1778         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1779                 SWARN(silent, s, "clm-7000",
1780                       "Detected readonly device, marking FS readonly");
1781                 s->s_flags |= MS_RDONLY;
1782         }
1783         args.objectid = REISERFS_ROOT_OBJECTID;
1784         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1785         root_inode =
1786             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1787                          reiserfs_init_locked_inode, (void *)(&args));
1788         if (!root_inode) {
1789                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1790                 goto error;
1791         }
1792
1793         if (root_inode->i_state & I_NEW) {
1794                 reiserfs_read_locked_inode(root_inode, &args);
1795                 unlock_new_inode(root_inode);
1796         }
1797
1798         s->s_root = d_alloc_root(root_inode);
1799         if (!s->s_root) {
1800                 iput(root_inode);
1801                 goto error;
1802         }
1803         // define and initialize hash function
1804         sbi->s_hash_function = hash_function(s);
1805         if (sbi->s_hash_function == NULL) {
1806                 dput(s->s_root);
1807                 s->s_root = NULL;
1808                 goto error;
1809         }
1810
1811         if (is_reiserfs_3_5(rs)
1812             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1813                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1814         else if (old_format)
1815                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1816         else
1817                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1818
1819         if (!(s->s_flags & MS_RDONLY)) {
1820
1821                 errval = journal_begin(&th, s, 1);
1822                 if (errval) {
1823                         dput(s->s_root);
1824                         s->s_root = NULL;
1825                         goto error;
1826                 }
1827                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1828
1829                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1830                 set_sb_fs_state(rs, 0);
1831
1832                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1833                  * case, but older revisions can't. This will cause the
1834                  * file system to fail mount on those older implementations,
1835                  * avoiding corruption. -jeffm */
1836                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1837                     sb_bmap_nr(rs) != 0) {
1838                         reiserfs_warning(s, "super-2030", "This file system "
1839                                         "claims to use %u bitmap blocks in "
1840                                         "its super block, but requires %u. "
1841                                         "Clearing to zero.", sb_bmap_nr(rs),
1842                                         reiserfs_bmap_count(s));
1843
1844                         set_sb_bmap_nr(rs, 0);
1845                 }
1846
1847                 if (old_format_only(s)) {
1848                         /* filesystem of format 3.5 either with standard or non-standard
1849                            journal */
1850                         if (convert_reiserfs(s)) {
1851                                 /* and -o conv is given */
1852                                 if (!silent)
1853                                         reiserfs_info(s,
1854                                                       "converting 3.5 filesystem to the 3.6 format");
1855
1856                                 if (is_reiserfs_3_5(rs))
1857                                         /* put magic string of 3.6 format. 2.2 will not be able to
1858                                            mount this filesystem anymore */
1859                                         memcpy(rs->s_v1.s_magic,
1860                                                reiserfs_3_6_magic_string,
1861                                                sizeof
1862                                                (reiserfs_3_6_magic_string));
1863
1864                                 set_sb_version(rs, REISERFS_VERSION_2);
1865                                 reiserfs_convert_objectid_map_v1(s);
1866                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1867                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1868                         } else if (!silent) {
1869                                 reiserfs_info(s, "using 3.5.x disk format\n");
1870                         }
1871                 } else
1872                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1873
1874
1875                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1876                 errval = journal_end(&th, s, 1);
1877                 if (errval) {
1878                         dput(s->s_root);
1879                         s->s_root = NULL;
1880                         goto error;
1881                 }
1882
1883                 if ((errval = reiserfs_lookup_privroot(s)) ||
1884                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1885                         dput(s->s_root);
1886                         s->s_root = NULL;
1887                         goto error;
1888                 }
1889
1890                 /* look for files which were to be removed in previous session */
1891                 finish_unfinished(s);
1892         } else {
1893                 if (old_format_only(s) && !silent) {
1894                         reiserfs_info(s, "using 3.5.x disk format\n");
1895                 }
1896
1897                 if ((errval = reiserfs_lookup_privroot(s)) ||
1898                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1899                         dput(s->s_root);
1900                         s->s_root = NULL;
1901                         goto error;
1902                 }
1903         }
1904         // mark hash in super block: it could be unset. overwrite should be ok
1905         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1906
1907         handle_attrs(s);
1908
1909         reiserfs_proc_info_init(s);
1910
1911         init_waitqueue_head(&(sbi->s_wait));
1912         spin_lock_init(&sbi->bitmap_lock);
1913
1914         reiserfs_write_unlock(s);
1915
1916         return (0);
1917
1918 error:
1919         if (jinit_done) {       /* kill the commit thread, free journal ram */
1920                 journal_release_error(NULL, s);
1921         }
1922
1923         reiserfs_write_unlock(s);
1924
1925         reiserfs_free_bitmap_cache(s);
1926         if (SB_BUFFER_WITH_SB(s))
1927                 brelse(SB_BUFFER_WITH_SB(s));
1928 #ifdef CONFIG_QUOTA
1929         {
1930                 int j;
1931                 for (j = 0; j < MAXQUOTAS; j++)
1932                         kfree(qf_names[j]);
1933         }
1934 #endif
1935         kfree(sbi);
1936
1937         s->s_fs_info = NULL;
1938         return errval;
1939 }
1940
1941 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1942 {
1943         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1944
1945         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1946         buf->f_bfree = sb_free_blocks(rs);
1947         buf->f_bavail = buf->f_bfree;
1948         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1949         buf->f_bsize = dentry->d_sb->s_blocksize;
1950         /* changed to accommodate gcc folks. */
1951         buf->f_type = REISERFS_SUPER_MAGIC;
1952         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1953         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1954                                 sizeof(rs->s_uuid)/2);
1955
1956         return 0;
1957 }
1958
1959 #ifdef CONFIG_QUOTA
1960 static int reiserfs_write_dquot(struct dquot *dquot)
1961 {
1962         struct reiserfs_transaction_handle th;
1963         int ret, err;
1964
1965         reiserfs_write_lock(dquot->dq_sb);
1966         ret =
1967             journal_begin(&th, dquot->dq_sb,
1968                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1969         if (ret)
1970                 goto out;
1971         reiserfs_write_unlock(dquot->dq_sb);
1972         ret = dquot_commit(dquot);
1973         reiserfs_write_lock(dquot->dq_sb);
1974         err =
1975             journal_end(&th, dquot->dq_sb,
1976                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1977         if (!ret && err)
1978                 ret = err;
1979 out:
1980         reiserfs_write_unlock(dquot->dq_sb);
1981         return ret;
1982 }
1983
1984 static int reiserfs_acquire_dquot(struct dquot *dquot)
1985 {
1986         struct reiserfs_transaction_handle th;
1987         int ret, err;
1988
1989         reiserfs_write_lock(dquot->dq_sb);
1990         ret =
1991             journal_begin(&th, dquot->dq_sb,
1992                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1993         if (ret)
1994                 goto out;
1995         reiserfs_write_unlock(dquot->dq_sb);
1996         ret = dquot_acquire(dquot);
1997         reiserfs_write_lock(dquot->dq_sb);
1998         err =
1999             journal_end(&th, dquot->dq_sb,
2000                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2001         if (!ret && err)
2002                 ret = err;
2003 out:
2004         reiserfs_write_unlock(dquot->dq_sb);
2005         return ret;
2006 }
2007
2008 static int reiserfs_release_dquot(struct dquot *dquot)
2009 {
2010         struct reiserfs_transaction_handle th;
2011         int ret, err;
2012
2013         reiserfs_write_lock(dquot->dq_sb);
2014         ret =
2015             journal_begin(&th, dquot->dq_sb,
2016                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2017         reiserfs_write_unlock(dquot->dq_sb);
2018         if (ret) {
2019                 /* Release dquot anyway to avoid endless cycle in dqput() */
2020                 dquot_release(dquot);
2021                 goto out;
2022         }
2023         ret = dquot_release(dquot);
2024         reiserfs_write_lock(dquot->dq_sb);
2025         err =
2026             journal_end(&th, dquot->dq_sb,
2027                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2028         if (!ret && err)
2029                 ret = err;
2030         reiserfs_write_unlock(dquot->dq_sb);
2031 out:
2032         return ret;
2033 }
2034
2035 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2036 {
2037         /* Are we journaling quotas? */
2038         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2039             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2040                 dquot_mark_dquot_dirty(dquot);
2041                 return reiserfs_write_dquot(dquot);
2042         } else
2043                 return dquot_mark_dquot_dirty(dquot);
2044 }
2045
2046 static int reiserfs_write_info(struct super_block *sb, int type)
2047 {
2048         struct reiserfs_transaction_handle th;
2049         int ret, err;
2050
2051         /* Data block + inode block */
2052         reiserfs_write_lock(sb);
2053         ret = journal_begin(&th, sb, 2);
2054         if (ret)
2055                 goto out;
2056         reiserfs_write_unlock(sb);
2057         ret = dquot_commit_info(sb, type);
2058         reiserfs_write_lock(sb);
2059         err = journal_end(&th, sb, 2);
2060         if (!ret && err)
2061                 ret = err;
2062 out:
2063         reiserfs_write_unlock(sb);
2064         return ret;
2065 }
2066
2067 /*
2068  * Turn on quotas during mount time - we need to find the quota file and such...
2069  */
2070 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2071 {
2072         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2073                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2074 }
2075
2076 /*
2077  * Standard function to be called on quota_on
2078  */
2079 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2080                              struct path *path)
2081 {
2082         int err;
2083         struct inode *inode;
2084         struct reiserfs_transaction_handle th;
2085
2086         reiserfs_write_lock(sb);
2087         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA))) {
2088                 err = -EINVAL;
2089                 goto out;
2090         }
2091
2092         /* Quotafile not on the same filesystem? */
2093         if (path->mnt->mnt_sb != sb) {
2094                 err = -EXDEV;
2095                 goto out;
2096         }
2097         inode = path->dentry->d_inode;
2098         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2099         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2100                 err = reiserfs_unpack(inode, NULL);
2101                 if (err) {
2102                         reiserfs_warning(sb, "super-6520",
2103                                 "Unpacking tail of quota file failed"
2104                                 " (%d). Cannot turn on quotas.", err);
2105                         err = -EINVAL;
2106                         goto out;
2107                 }
2108                 mark_inode_dirty(inode);
2109         }
2110         /* Journaling quota? */
2111         if (REISERFS_SB(sb)->s_qf_names[type]) {
2112                 /* Quotafile not of fs root? */
2113                 if (path->dentry->d_parent != sb->s_root)
2114                         reiserfs_warning(sb, "super-6521",
2115                                  "Quota file not on filesystem root. "
2116                                  "Journalled quota will not work.");
2117         }
2118
2119         /*
2120          * When we journal data on quota file, we have to flush journal to see
2121          * all updates to the file when we bypass pagecache...
2122          */
2123         if (reiserfs_file_data_log(inode)) {
2124                 /* Just start temporary transaction and finish it */
2125                 err = journal_begin(&th, sb, 1);
2126                 if (err)
2127                         goto out;
2128                 err = journal_end_sync(&th, sb, 1);
2129                 if (err)
2130                         goto out;
2131         }
2132         reiserfs_write_unlock(sb);
2133         return dquot_quota_on(sb, type, format_id, path);
2134 out:
2135         reiserfs_write_unlock(sb);
2136         return err;
2137 }
2138
2139 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2140  * acquiring the locks... As quota files are never truncated and quota code
2141  * itself serializes the operations (and no one else should touch the files)
2142  * we don't have to be afraid of races */
2143 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2144                                    size_t len, loff_t off)
2145 {
2146         struct inode *inode = sb_dqopt(sb)->files[type];
2147         unsigned long blk = off >> sb->s_blocksize_bits;
2148         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2149         size_t toread;
2150         struct buffer_head tmp_bh, *bh;
2151         loff_t i_size = i_size_read(inode);
2152
2153         if (off > i_size)
2154                 return 0;
2155         if (off + len > i_size)
2156                 len = i_size - off;
2157         toread = len;
2158         while (toread > 0) {
2159                 tocopy =
2160                     sb->s_blocksize - offset <
2161                     toread ? sb->s_blocksize - offset : toread;
2162                 tmp_bh.b_state = 0;
2163                 /* Quota files are without tails so we can safely use this function */
2164                 reiserfs_write_lock(sb);
2165                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2166                 reiserfs_write_unlock(sb);
2167                 if (err)
2168                         return err;
2169                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2170                         memset(data, 0, tocopy);
2171                 else {
2172                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2173                         if (!bh)
2174                                 return -EIO;
2175                         memcpy(data, bh->b_data + offset, tocopy);
2176                         brelse(bh);
2177                 }
2178                 offset = 0;
2179                 toread -= tocopy;
2180                 data += tocopy;
2181                 blk++;
2182         }
2183         return len;
2184 }
2185
2186 /* Write to quotafile (we know the transaction is already started and has
2187  * enough credits) */
2188 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2189                                     const char *data, size_t len, loff_t off)
2190 {
2191         struct inode *inode = sb_dqopt(sb)->files[type];
2192         unsigned long blk = off >> sb->s_blocksize_bits;
2193         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2194         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2195         size_t towrite = len;
2196         struct buffer_head tmp_bh, *bh;
2197
2198         if (!current->journal_info) {
2199                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2200                         " cancelled because transaction is not started.\n",
2201                         (unsigned long long)off, (unsigned long long)len);
2202                 return -EIO;
2203         }
2204         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2205         while (towrite > 0) {
2206                 tocopy = sb->s_blocksize - offset < towrite ?
2207                     sb->s_blocksize - offset : towrite;
2208                 tmp_bh.b_state = 0;
2209                 reiserfs_write_lock(sb);
2210                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2211                 reiserfs_write_unlock(sb);
2212                 if (err)
2213                         goto out;
2214                 if (offset || tocopy != sb->s_blocksize)
2215                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2216                 else
2217                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2218                 if (!bh) {
2219                         err = -EIO;
2220                         goto out;
2221                 }
2222                 lock_buffer(bh);
2223                 memcpy(bh->b_data + offset, data, tocopy);
2224                 flush_dcache_page(bh->b_page);
2225                 set_buffer_uptodate(bh);
2226                 unlock_buffer(bh);
2227                 reiserfs_write_lock(sb);
2228                 reiserfs_prepare_for_journal(sb, bh, 1);
2229                 journal_mark_dirty(current->journal_info, sb, bh);
2230                 if (!journal_quota)
2231                         reiserfs_add_ordered_list(inode, bh);
2232                 reiserfs_write_unlock(sb);
2233                 brelse(bh);
2234                 offset = 0;
2235                 towrite -= tocopy;
2236                 data += tocopy;
2237                 blk++;
2238         }
2239 out:
2240         if (len == towrite) {
2241                 mutex_unlock(&inode->i_mutex);
2242                 return err;
2243         }
2244         if (inode->i_size < off + len - towrite)
2245                 i_size_write(inode, off + len - towrite);
2246         inode->i_version++;
2247         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2248         mark_inode_dirty(inode);
2249         mutex_unlock(&inode->i_mutex);
2250         return len - towrite;
2251 }
2252
2253 #endif
2254
2255 static struct dentry *get_super_block(struct file_system_type *fs_type,
2256                            int flags, const char *dev_name,
2257                            void *data)
2258 {
2259         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2260 }
2261
2262 static int __init init_reiserfs_fs(void)
2263 {
2264         int ret;
2265
2266         if ((ret = init_inodecache())) {
2267                 return ret;
2268         }
2269
2270         reiserfs_proc_info_global_init();
2271
2272         ret = register_filesystem(&reiserfs_fs_type);
2273
2274         if (ret == 0) {
2275                 return 0;
2276         }
2277
2278         reiserfs_proc_info_global_done();
2279         destroy_inodecache();
2280
2281         return ret;
2282 }
2283
2284 static void __exit exit_reiserfs_fs(void)
2285 {
2286         reiserfs_proc_info_global_done();
2287         unregister_filesystem(&reiserfs_fs_type);
2288         destroy_inodecache();
2289 }
2290
2291 struct file_system_type reiserfs_fs_type = {
2292         .owner = THIS_MODULE,
2293         .name = "reiserfs",
2294         .mount = get_super_block,
2295         .kill_sb = reiserfs_kill_sb,
2296         .fs_flags = FS_REQUIRES_DEV,
2297 };
2298
2299 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2300 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2301 MODULE_LICENSE("GPL");
2302
2303 module_init(init_reiserfs_fs);
2304 module_exit(exit_reiserfs_fs);