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