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 #include <linux/smp_lock.h>
  32
  33 struct file_system_type reiserfs_fs_type;
  34
  35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  38
  39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  40 {
  41         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  42                         strlen(reiserfs_3_5_magic_string));
  43 }
  44
  45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  46 {
  47         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  48                         strlen(reiserfs_3_6_magic_string));
  49 }
  50
  51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  52 {
  53         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  54                         strlen(reiserfs_jr_magic_string));
  55 }
  56
  57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  58 {
  59         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  60                 is_reiserfs_jr(rs));
  61 }
  62
  63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  65
  66 static int reiserfs_sync_fs(struct super_block *s, int wait)
  67 {
  68         struct reiserfs_transaction_handle th;
  69
  70         reiserfs_write_lock(s);
  71         if (!journal_begin(&th, s, 1))
  72                 if (!journal_end_sync(&th, s, 1))
  73                         reiserfs_flush_old_commits(s);
  74         s->s_dirt = 0;  /* Even if it's not true.
  75                          * We'll loop forever in sync_supers otherwise */
  76         reiserfs_write_unlock(s);
  77         return 0;
  78 }
  79
  80 static void reiserfs_write_super(struct super_block *s)
  81 {
  82         reiserfs_sync_fs(s, 1);
  83 }
  84
  85 static int reiserfs_freeze(struct super_block *s)
  86 {
  87         struct reiserfs_transaction_handle th;
  88         reiserfs_write_lock(s);
  89         if (!(s->s_flags & MS_RDONLY)) {
  90                 int err = journal_begin(&th, s, 1);
  91                 if (err) {
  92                         reiserfs_block_writes(&th);
  93                 } else {
  94                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  95                                                      1);
  96                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  97                         reiserfs_block_writes(&th);
  98                         journal_end_sync(&th, s, 1);
  99                 }
 100         }
 101         s->s_dirt = 0;
 102         reiserfs_write_unlock(s);
 103         return 0;
 104 }
 105
 106 static int reiserfs_unfreeze(struct super_block *s)
 107 {
 108         reiserfs_allow_writes(s);
 109         return 0;
 110 }
 111
 112 extern const struct in_core_key MAX_IN_CORE_KEY;
 113
 114 /* this is used to delete "save link" when there are no items of a
 115    file it points to. It can either happen if unlink is completed but
 116    "save unlink" removal, or if file has both unlink and truncate
 117    pending and as unlink completes first (because key of "save link"
 118    protecting unlink is bigger that a key lf "save link" which
 119    protects truncate), so there left no items to make truncate
 120    completion on */
 121 static int remove_save_link_only(struct super_block *s,
 122                                  struct reiserfs_key *key, int oid_free)
 123 {
 124         struct reiserfs_transaction_handle th;
 125         int err;
 126
 127         /* we are going to do one balancing */
 128         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 129         if (err)
 130                 return err;
 131
 132         reiserfs_delete_solid_item(&th, NULL, key);
 133         if (oid_free)
 134                 /* removals are protected by direct items */
 135                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 136
 137         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 138 }
 139
 140 #ifdef CONFIG_QUOTA
 141 static int reiserfs_quota_on_mount(struct super_block *, int);
 142 #endif
 143
 144 /* look for uncompleted unlinks and truncates and complete them */
 145 static int finish_unfinished(struct super_block *s)
 146 {
 147         INITIALIZE_PATH(path);
 148         struct cpu_key max_cpu_key, obj_key;
 149         struct reiserfs_key save_link_key, last_inode_key;
 150         int retval = 0;
 151         struct item_head *ih;
 152         struct buffer_head *bh;
 153         int item_pos;
 154         char *item;
 155         int done;
 156         struct inode *inode;
 157         int truncate;
 158 #ifdef CONFIG_QUOTA
 159         int i;
 160         int ms_active_set;
 161         int quota_enabled[MAXQUOTAS];
 162 #endif
 163
 164         /* compose key to look for "save" links */
 165         max_cpu_key.version = KEY_FORMAT_3_5;
 166         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 167         max_cpu_key.on_disk_key.k_objectid = ~0U;
 168         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 169         max_cpu_key.key_length = 3;
 170
 171         memset(&last_inode_key, 0, sizeof(last_inode_key));
 172
 173 #ifdef CONFIG_QUOTA
 174         /* Needed for iput() to work correctly and not trash data */
 175         if (s->s_flags & MS_ACTIVE) {
 176                 ms_active_set = 0;
 177         } else {
 178                 ms_active_set = 1;
 179                 s->s_flags |= MS_ACTIVE;
 180         }
 181         /* Turn on quotas so that they are updated correctly */
 182         for (i = 0; i < MAXQUOTAS; i++) {
 183                 quota_enabled[i] = 1;
 184                 if (REISERFS_SB(s)->s_qf_names[i]) {
 185                         int ret;
 186
 187                         if (sb_has_quota_active(s, i)) {
 188                                 quota_enabled[i] = 0;
 189                                 continue;
 190                         }
 191                         ret = reiserfs_quota_on_mount(s, i);
 192                         if (ret < 0)
 193                                 reiserfs_warning(s, "reiserfs-2500",
 194                                                  "cannot turn on journaled "
 195                                                  "quota: error %d", ret);
 196                 }
 197         }
 198 #endif
 199
 200         done = 0;
 201         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 202         while (!retval) {
 203                 retval = search_item(s, &max_cpu_key, &path);
 204                 if (retval != ITEM_NOT_FOUND) {
 205                         reiserfs_error(s, "vs-2140",
 206                                        "search_by_key returned %d", retval);
 207                         break;
 208                 }
 209
 210                 bh = get_last_bh(&path);
 211                 item_pos = get_item_pos(&path);
 212                 if (item_pos != B_NR_ITEMS(bh)) {
 213                         reiserfs_warning(s, "vs-2060",
 214                                          "wrong position found");
 215                         break;
 216                 }
 217                 item_pos--;
 218                 ih = B_N_PITEM_HEAD(bh, item_pos);
 219
 220                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 221                         /* there are no "save" links anymore */
 222                         break;
 223
 224                 save_link_key = ih->ih_key;
 225                 if (is_indirect_le_ih(ih))
 226                         truncate = 1;
 227                 else
 228                         truncate = 0;
 229
 230                 /* reiserfs_iget needs k_dirid and k_objectid only */
 231                 item = B_I_PITEM(bh, ih);
 232                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 233                 obj_key.on_disk_key.k_objectid =
 234                     le32_to_cpu(ih->ih_key.k_objectid);
 235                 obj_key.on_disk_key.k_offset = 0;
 236                 obj_key.on_disk_key.k_type = 0;
 237
 238                 pathrelse(&path);
 239
 240                 inode = reiserfs_iget(s, &obj_key);
 241                 if (!inode) {
 242                         /* the unlink almost completed, it just did not manage to remove
 243                            "save" link and release objectid */
 244                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 245                                          &obj_key);
 246                         retval = remove_save_link_only(s, &save_link_key, 1);
 247                         continue;
 248                 }
 249
 250                 if (!truncate && inode->i_nlink) {
 251                         /* file is not unlinked */
 252                         reiserfs_warning(s, "vs-2185",
 253                                          "file %K is not unlinked",
 254                                          &obj_key);
 255                         retval = remove_save_link_only(s, &save_link_key, 0);
 256                         continue;
 257                 }
 258                 dquot_initialize(inode);
 259
 260                 if (truncate && S_ISDIR(inode->i_mode)) {
 261                         /* We got a truncate request for a dir which is impossible.
 262                            The only imaginable way is to execute unfinished truncate request
 263                            then boot into old kernel, remove the file and create dir with
 264                            the same key. */
 265                         reiserfs_warning(s, "green-2101",
 266                                          "impossible truncate on a "
 267                                          "directory %k. Please report",
 268                                          INODE_PKEY(inode));
 269                         retval = remove_save_link_only(s, &save_link_key, 0);
 270                         truncate = 0;
 271                         iput(inode);
 272                         continue;
 273                 }
 274
 275                 if (truncate) {
 276                         REISERFS_I(inode)->i_flags |=
 277                             i_link_saved_truncate_mask;
 278                         /* not completed truncate found. New size was committed together
 279                            with "save" link */
 280                         reiserfs_info(s, "Truncating %k to %Ld ..",
 281                                       INODE_PKEY(inode), inode->i_size);
 282                         reiserfs_truncate_file(inode,
 283                                                0
 284                                                /*don't update modification time */
 285                                                );
 286                         retval = remove_save_link(inode, truncate);
 287                 } else {
 288                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 289                         /* not completed unlink (rmdir) found */
 290                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 291                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 292                                         sizeof(last_inode_key))){
 293                                 last_inode_key = *INODE_PKEY(inode);
 294                                 /* removal gets completed in iput */
 295                                 retval = 0;
 296                         } else {
 297                                 reiserfs_warning(s, "super-2189", "Dead loop "
 298                                                  "in finish_unfinished "
 299                                                  "detected, just remove "
 300                                                  "save link\n");
 301                                 retval = remove_save_link_only(s,
 302                                                         &save_link_key, 0);
 303                         }
 304                 }
 305
 306                 iput(inode);
 307                 printk("done\n");
 308                 done++;
 309         }
 310         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 311
 312 #ifdef CONFIG_QUOTA
 313         /* Turn quotas off */
 314         for (i = 0; i < MAXQUOTAS; i++) {
 315                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 316                         dquot_quota_off(s, i);
 317         }
 318         if (ms_active_set)
 319                 /* Restore the flag back */
 320                 s->s_flags &= ~MS_ACTIVE;
 321 #endif
 322         pathrelse(&path);
 323         if (done)
 324                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 325                               "Completed\n", done);
 326         return retval;
 327 }
 328
 329 /* to protect file being unlinked from getting lost we "safe" link files
 330    being unlinked. This link will be deleted in the same transaction with last
 331    item of file. mounting the filesystem we scan all these links and remove
 332    files which almost got lost */
 333 void add_save_link(struct reiserfs_transaction_handle *th,
 334                    struct inode *inode, int truncate)
 335 {
 336         INITIALIZE_PATH(path);
 337         int retval;
 338         struct cpu_key key;
 339         struct item_head ih;
 340         __le32 link;
 341
 342         BUG_ON(!th->t_trans_id);
 343
 344         /* file can only get one "save link" of each kind */
 345         RFALSE(truncate &&
 346                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 347                "saved link already exists for truncated inode %lx",
 348                (long)inode->i_ino);
 349         RFALSE(!truncate &&
 350                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 351                "saved link already exists for unlinked inode %lx",
 352                (long)inode->i_ino);
 353
 354         /* setup key of "save" link */
 355         key.version = KEY_FORMAT_3_5;
 356         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 357         key.on_disk_key.k_objectid = inode->i_ino;
 358         if (!truncate) {
 359                 /* unlink, rmdir, rename */
 360                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 361                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 362
 363                 /* item head of "safe" link */
 364                 make_le_item_head(&ih, &key, key.version,
 365                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 366                                   4 /*length */ , 0xffff /*free space */ );
 367         } else {
 368                 /* truncate */
 369                 if (S_ISDIR(inode->i_mode))
 370                         reiserfs_warning(inode->i_sb, "green-2102",
 371                                          "Adding a truncate savelink for "
 372                                          "a directory %k! Please report",
 373                                          INODE_PKEY(inode));
 374                 set_cpu_key_k_offset(&key, 1);
 375                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 376
 377                 /* item head of "safe" link */
 378                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 379                                   4 /*length */ , 0 /*free space */ );
 380         }
 381         key.key_length = 3;
 382
 383         /* look for its place in the tree */
 384         retval = search_item(inode->i_sb, &key, &path);
 385         if (retval != ITEM_NOT_FOUND) {
 386                 if (retval != -ENOSPC)
 387                         reiserfs_error(inode->i_sb, "vs-2100",
 388                                        "search_by_key (%K) returned %d", &key,
 389                                        retval);
 390                 pathrelse(&path);
 391                 return;
 392         }
 393
 394         /* body of "save" link */
 395         link = INODE_PKEY(inode)->k_dir_id;
 396
 397         /* put "save" link inot tree, don't charge quota to anyone */
 398         retval =
 399             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 400         if (retval) {
 401                 if (retval != -ENOSPC)
 402                         reiserfs_error(inode->i_sb, "vs-2120",
 403                                        "insert_item returned %d", retval);
 404         } else {
 405                 if (truncate)
 406                         REISERFS_I(inode)->i_flags |=
 407                             i_link_saved_truncate_mask;
 408                 else
 409                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 410         }
 411 }
 412
 413 /* this opens transaction unlike add_save_link */
 414 int remove_save_link(struct inode *inode, int truncate)
 415 {
 416         struct reiserfs_transaction_handle th;
 417         struct reiserfs_key key;
 418         int err;
 419
 420         /* we are going to do one balancing only */
 421         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 422         if (err)
 423                 return err;
 424
 425         /* setup key of "save" link */
 426         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 427         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 428         if (!truncate) {
 429                 /* unlink, rmdir, rename */
 430                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 431                                     1 + inode->i_sb->s_blocksize);
 432                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 433         } else {
 434                 /* truncate */
 435                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 436                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 437         }
 438
 439         if ((truncate &&
 440              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 441             (!truncate &&
 442              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 443                 /* don't take quota bytes from anywhere */
 444                 reiserfs_delete_solid_item(&th, NULL, &key);
 445         if (!truncate) {
 446                 reiserfs_release_objectid(&th, inode->i_ino);
 447                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 448         } else
 449                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 450
 451         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 452 }
 453
 454 static void reiserfs_kill_sb(struct super_block *s)
 455 {
 456         if (REISERFS_SB(s)) {
 457                 if (REISERFS_SB(s)->xattr_root) {
 458                         d_invalidate(REISERFS_SB(s)->xattr_root);
 459                         dput(REISERFS_SB(s)->xattr_root);
 460                         REISERFS_SB(s)->xattr_root = NULL;
 461                 }
 462                 if (REISERFS_SB(s)->priv_root) {
 463                         d_invalidate(REISERFS_SB(s)->priv_root);
 464                         dput(REISERFS_SB(s)->priv_root);
 465                         REISERFS_SB(s)->priv_root = NULL;
 466                 }
 467         }
 468
 469         kill_block_super(s);
 470 }
 471
 472 static void reiserfs_put_super(struct super_block *s)
 473 {
 474         struct reiserfs_transaction_handle th;
 475         th.t_trans_id = 0;
 476
 477         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 478
 479         reiserfs_write_lock(s);
 480
 481         if (s->s_dirt)
 482                 reiserfs_write_super(s);
 483
 484         /* change file system state to current state if it was mounted with read-write permissions */
 485         if (!(s->s_flags & MS_RDONLY)) {
 486                 if (!journal_begin(&th, s, 10)) {
 487                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 488                                                      1);
 489                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 490                                             REISERFS_SB(s)->s_mount_state);
 491                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 492                 }
 493         }
 494
 495         /* note, journal_release checks for readonly mount, and can decide not
 496          ** to do a journal_end
 497          */
 498         journal_release(&th, s);
 499
 500         reiserfs_free_bitmap_cache(s);
 501
 502         brelse(SB_BUFFER_WITH_SB(s));
 503
 504         print_statistics(s);
 505
 506         if (REISERFS_SB(s)->reserved_blocks != 0) {
 507                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 508                                  REISERFS_SB(s)->reserved_blocks);
 509         }
 510
 511         reiserfs_proc_info_done(s);
 512
 513         reiserfs_write_unlock(s);
 514         mutex_destroy(&REISERFS_SB(s)->lock);
 515         kfree(s->s_fs_info);
 516         s->s_fs_info = NULL;
 517 }
 518
 519 static struct kmem_cache *reiserfs_inode_cachep;
 520
 521 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 522 {
 523         struct reiserfs_inode_info *ei;
 524         ei = (struct reiserfs_inode_info *)
 525             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 526         if (!ei)
 527                 return NULL;
 528         return &ei->vfs_inode;
 529 }
 530
 531 static void reiserfs_destroy_inode(struct inode *inode)
 532 {
 533         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 534 }
 535
 536 static void init_once(void *foo)
 537 {
 538         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 539
 540         INIT_LIST_HEAD(&ei->i_prealloc_list);
 541         inode_init_once(&ei->vfs_inode);
 542 }
 543
 544 static int init_inodecache(void)
 545 {
 546         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 547                                                   sizeof(struct
 548                                                          reiserfs_inode_info),
 549                                                   0, (SLAB_RECLAIM_ACCOUNT|
 550                                                         SLAB_MEM_SPREAD),
 551                                                   init_once);
 552         if (reiserfs_inode_cachep == NULL)
 553                 return -ENOMEM;
 554         return 0;
 555 }
 556
 557 static void destroy_inodecache(void)
 558 {
 559         kmem_cache_destroy(reiserfs_inode_cachep);
 560 }
 561
 562 /* we don't mark inodes dirty, we just log them */
 563 static void reiserfs_dirty_inode(struct inode *inode)
 564 {
 565         struct reiserfs_transaction_handle th;
 566
 567         int err = 0;
 568         int lock_depth;
 569
 570         if (inode->i_sb->s_flags & MS_RDONLY) {
 571                 reiserfs_warning(inode->i_sb, "clm-6006",
 572                                  "writing inode %lu on readonly FS",
 573                                  inode->i_ino);
 574                 return;
 575         }
 576         lock_depth = reiserfs_write_lock_once(inode->i_sb);
 577
 578         /* this is really only used for atime updates, so they don't have
 579          ** to be included in O_SYNC or fsync
 580          */
 581         err = journal_begin(&th, inode->i_sb, 1);
 582         if (err)
 583                 goto out;
 584
 585         reiserfs_update_sd(&th, inode);
 586         journal_end(&th, inode->i_sb, 1);
 587
 588 out:
 589         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 590 }
 591
 592 static void reiserfs_clear_inode(struct inode *inode)
 593 {
 594         dquot_drop(inode);
 595 }
 596
 597 #ifdef CONFIG_QUOTA
 598 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 599                                     size_t, loff_t);
 600 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 601                                    loff_t);
 602 #endif
 603
 604 static const struct super_operations reiserfs_sops = {
 605         .alloc_inode = reiserfs_alloc_inode,
 606         .destroy_inode = reiserfs_destroy_inode,
 607         .write_inode = reiserfs_write_inode,
 608         .dirty_inode = reiserfs_dirty_inode,
 609         .clear_inode = reiserfs_clear_inode,
 610         .delete_inode = reiserfs_delete_inode,
 611         .put_super = reiserfs_put_super,
 612         .write_super = reiserfs_write_super,
 613         .sync_fs = reiserfs_sync_fs,
 614         .freeze_fs = reiserfs_freeze,
 615         .unfreeze_fs = reiserfs_unfreeze,
 616         .statfs = reiserfs_statfs,
 617         .remount_fs = reiserfs_remount,
 618         .show_options = generic_show_options,
 619 #ifdef CONFIG_QUOTA
 620         .quota_read = reiserfs_quota_read,
 621         .quota_write = reiserfs_quota_write,
 622 #endif
 623 };
 624
 625 #ifdef CONFIG_QUOTA
 626 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 627
 628 static int reiserfs_write_dquot(struct dquot *);
 629 static int reiserfs_acquire_dquot(struct dquot *);
 630 static int reiserfs_release_dquot(struct dquot *);
 631 static int reiserfs_mark_dquot_dirty(struct dquot *);
 632 static int reiserfs_write_info(struct super_block *, int);
 633 static int reiserfs_quota_on(struct super_block *, int, int, char *);
 634
 635 static const struct dquot_operations reiserfs_quota_operations = {
 636         .write_dquot = reiserfs_write_dquot,
 637         .acquire_dquot = reiserfs_acquire_dquot,
 638         .release_dquot = reiserfs_release_dquot,
 639         .mark_dirty = reiserfs_mark_dquot_dirty,
 640         .write_info = reiserfs_write_info,
 641         .alloc_dquot    = dquot_alloc,
 642         .destroy_dquot  = dquot_destroy,
 643 };
 644
 645 static const struct quotactl_ops reiserfs_qctl_operations = {
 646         .quota_on = reiserfs_quota_on,
 647         .quota_off = dquot_quota_off,
 648         .quota_sync = dquot_quota_sync,
 649         .get_info = dquot_get_dqinfo,
 650         .set_info = dquot_set_dqinfo,
 651         .get_dqblk = dquot_get_dqblk,
 652         .set_dqblk = dquot_set_dqblk,
 653 };
 654 #endif
 655
 656 static const struct export_operations reiserfs_export_ops = {
 657         .encode_fh = reiserfs_encode_fh,
 658         .fh_to_dentry = reiserfs_fh_to_dentry,
 659         .fh_to_parent = reiserfs_fh_to_parent,
 660         .get_parent = reiserfs_get_parent,
 661 };
 662
 663 /* this struct is used in reiserfs_getopt () for containing the value for those
 664    mount options that have values rather than being toggles. */
 665 typedef struct {
 666         char *value;
 667         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 668                                    value is found, 0 is no bits are to be changed. */
 669         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 670                                    value is found, 0 is no bits are to be changed. This is
 671                                    applied BEFORE setmask */
 672 } arg_desc_t;
 673
 674 /* Set this bit in arg_required to allow empty arguments */
 675 #define REISERFS_OPT_ALLOWEMPTY 31
 676
 677 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 678    mount options */
 679 typedef struct {
 680         char *option_name;
 681         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 682         const arg_desc_t *values;       /* list of values accepted by an option */
 683         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 684                                    value is found, 0 is no bits are to be changed. */
 685         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 686                                    value is found, 0 is no bits are to be changed. This is
 687                                    applied BEFORE setmask */
 688 } opt_desc_t;
 689
 690 /* possible values for -o data= */
 691 static const arg_desc_t logging_mode[] = {
 692         {"ordered", 1 << REISERFS_DATA_ORDERED,
 693          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 694         {"journal", 1 << REISERFS_DATA_LOG,
 695          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 696         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 697          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 698         {.value = NULL}
 699 };
 700
 701 /* possible values for -o barrier= */
 702 static const arg_desc_t barrier_mode[] = {
 703         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 704         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 705         {.value = NULL}
 706 };
 707
 708 /* possible values for "-o block-allocator=" and bits which are to be set in
 709    s_mount_opt of reiserfs specific part of in-core super block */
 710 static const arg_desc_t balloc[] = {
 711         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 712         {"border", 0, 1 << REISERFS_NO_BORDER},
 713         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 714         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 715         {"test4", 1 << REISERFS_TEST4, 0},
 716         {"notest4", 0, 1 << REISERFS_TEST4},
 717         {NULL, 0, 0}
 718 };
 719
 720 static const arg_desc_t tails[] = {
 721         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 722         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 723         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 724         {NULL, 0, 0}
 725 };
 726
 727 static const arg_desc_t error_actions[] = {
 728         {"panic", 1 << REISERFS_ERROR_PANIC,
 729          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 730         {"ro-remount", 1 << REISERFS_ERROR_RO,
 731          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 732 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 733         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 734          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 735 #endif
 736         {NULL, 0, 0},
 737 };
 738
 739 /* proceed only one option from a list *cur - string containing of mount options
 740    opts - array of options which are accepted
 741    opt_arg - if option is found and requires an argument and if it is specifed
 742    in the input - pointer to the argument is stored here
 743    bit_flags - if option requires to set a certain bit - it is set here
 744    return -1 if unknown option is found, opt->arg_required otherwise */
 745 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 746                            char **opt_arg, unsigned long *bit_flags)
 747 {
 748         char *p;
 749         /* foo=bar,
 750            ^   ^  ^
 751            |   |  +-- option_end
 752            |   +-- arg_start
 753            +-- option_start
 754          */
 755         const opt_desc_t *opt;
 756         const arg_desc_t *arg;
 757
 758         p = *cur;
 759
 760         /* assume argument cannot contain commas */
 761         *cur = strchr(p, ',');
 762         if (*cur) {
 763                 *(*cur) = '\0';
 764                 (*cur)++;
 765         }
 766
 767         if (!strncmp(p, "alloc=", 6)) {
 768                 /* Ugly special case, probably we should redo options parser so that
 769                    it can understand several arguments for some options, also so that
 770                    it can fill several bitfields with option values. */
 771                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 772                         return -1;
 773                 } else {
 774                         return 0;
 775                 }
 776         }
 777
 778         /* for every option in the list */
 779         for (opt = opts; opt->option_name; opt++) {
 780                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 781                         if (bit_flags) {
 782                                 if (opt->clrmask ==
 783                                     (1 << REISERFS_UNSUPPORTED_OPT))
 784                                         reiserfs_warning(s, "super-6500",
 785                                                          "%s not supported.\n",
 786                                                          p);
 787                                 else
 788                                         *bit_flags &= ~opt->clrmask;
 789                                 if (opt->setmask ==
 790                                     (1 << REISERFS_UNSUPPORTED_OPT))
 791                                         reiserfs_warning(s, "super-6501",
 792                                                          "%s not supported.\n",
 793                                                          p);
 794                                 else
 795                                         *bit_flags |= opt->setmask;
 796                         }
 797                         break;
 798                 }
 799         }
 800         if (!opt->option_name) {
 801                 reiserfs_warning(s, "super-6502",
 802                                  "unknown mount option \"%s\"", p);
 803                 return -1;
 804         }
 805
 806         p += strlen(opt->option_name);
 807         switch (*p) {
 808         case '=':
 809                 if (!opt->arg_required) {
 810                         reiserfs_warning(s, "super-6503",
 811                                          "the option \"%s\" does not "
 812                                          "require an argument\n",
 813                                          opt->option_name);
 814                         return -1;
 815                 }
 816                 break;
 817
 818         case 0:
 819                 if (opt->arg_required) {
 820                         reiserfs_warning(s, "super-6504",
 821                                          "the option \"%s\" requires an "
 822                                          "argument\n", opt->option_name);
 823                         return -1;
 824                 }
 825                 break;
 826         default:
 827                 reiserfs_warning(s, "super-6505",
 828                                  "head of option \"%s\" is only correct\n",
 829                                  opt->option_name);
 830                 return -1;
 831         }
 832
 833         /* move to the argument, or to next option if argument is not required */
 834         p++;
 835
 836         if (opt->arg_required
 837             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 838             && !strlen(p)) {
 839                 /* this catches "option=," if not allowed */
 840                 reiserfs_warning(s, "super-6506",
 841                                  "empty argument for \"%s\"\n",
 842                                  opt->option_name);
 843                 return -1;
 844         }
 845
 846         if (!opt->values) {
 847                 /* *=NULLopt_arg contains pointer to argument */
 848                 *opt_arg = p;
 849                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 850         }
 851
 852         /* values possible for this option are listed in opt->values */
 853         for (arg = opt->values; arg->value; arg++) {
 854                 if (!strcmp(p, arg->value)) {
 855                         if (bit_flags) {
 856                                 *bit_flags &= ~arg->clrmask;
 857                                 *bit_flags |= arg->setmask;
 858                         }
 859                         return opt->arg_required;
 860                 }
 861         }
 862
 863         reiserfs_warning(s, "super-6506",
 864                          "bad value \"%s\" for option \"%s\"\n", p,
 865                          opt->option_name);
 866         return -1;
 867 }
 868
 869 /* returns 0 if something is wrong in option string, 1 - otherwise */
 870 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 871                                   unsigned long *mount_options,
 872                                   /* after the parsing phase, contains the
 873                                      collection of bitflags defining what
 874                                      mount options were selected. */
 875                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 876                                   char **jdev_name,
 877                                   unsigned int *commit_max_age,
 878                                   char **qf_names,
 879                                   unsigned int *qfmt)
 880 {
 881         int c;
 882         char *arg = NULL;
 883         char *pos;
 884         opt_desc_t opts[] = {
 885                 /* Compatibility stuff, so that -o notail for old setups still work */
 886                 {"tails",.arg_required = 't',.values = tails},
 887                 {"notail",.clrmask =
 888                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 889                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 890                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 891                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 892                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 893 #ifdef CONFIG_REISERFS_FS_XATTR
 894                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 895                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 896 #else
 897                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 898                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 899 #endif
 900 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 901                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 902                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 903 #else
 904                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 905                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 906 #endif
 907                 {.option_name = "nolog"},
 908                 {"replayonly",.setmask = 1 << REPLAYONLY},
 909                 {"block-allocator",.arg_required = 'a',.values = balloc},
 910                 {"data",.arg_required = 'd',.values = logging_mode},
 911                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 912                 {"resize",.arg_required = 'r',.values = NULL},
 913                 {"jdev",.arg_required = 'j',.values = NULL},
 914                 {"nolargeio",.arg_required = 'w',.values = NULL},
 915                 {"commit",.arg_required = 'c',.values = NULL},
 916                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 917                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 918                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 919                 {"errors",.arg_required = 'e',.values = error_actions},
 920                 {"usrjquota",.arg_required =
 921                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 922                 {"grpjquota",.arg_required =
 923                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 924                 {"jqfmt",.arg_required = 'f',.values = NULL},
 925                 {.option_name = NULL}
 926         };
 927
 928         *blocks = 0;
 929         if (!options || !*options)
 930                 /* use default configuration: create tails, journaling on, no
 931                    conversion to newest format */
 932                 return 1;
 933
 934         for (pos = options; pos;) {
 935                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 936                 if (c == -1)
 937                         /* wrong option is given */
 938                         return 0;
 939
 940                 if (c == 'r') {
 941                         char *p;
 942
 943                         p = NULL;
 944                         /* "resize=NNN" or "resize=auto" */
 945
 946                         if (!strcmp(arg, "auto")) {
 947                                 /* From JFS code, to auto-get the size. */
 948                                 *blocks =
 949                                     s->s_bdev->bd_inode->i_size >> s->
 950                                     s_blocksize_bits;
 951                         } else {
 952                                 *blocks = simple_strtoul(arg, &p, 0);
 953                                 if (*p != '\0') {
 954                                         /* NNN does not look like a number */
 955                                         reiserfs_warning(s, "super-6507",
 956                                                          "bad value %s for "
 957                                                          "-oresize\n", arg);
 958                                         return 0;
 959                                 }
 960                         }
 961                 }
 962
 963                 if (c == 'c') {
 964                         char *p = NULL;
 965                         unsigned long val = simple_strtoul(arg, &p, 0);
 966                         /* commit=NNN (time in seconds) */
 967                         if (*p != '\0' || val >= (unsigned int)-1) {
 968                                 reiserfs_warning(s, "super-6508",
 969                                                  "bad value %s for -ocommit\n",
 970                                                  arg);
 971                                 return 0;
 972                         }
 973                         *commit_max_age = (unsigned int)val;
 974                 }
 975
 976                 if (c == 'w') {
 977                         reiserfs_warning(s, "super-6509", "nolargeio option "
 978                                          "is no longer supported");
 979                         return 0;
 980                 }
 981
 982                 if (c == 'j') {
 983                         if (arg && *arg && jdev_name) {
 984                                 if (*jdev_name) {       //Hm, already assigned?
 985                                         reiserfs_warning(s, "super-6510",
 986                                                          "journal device was "
 987                                                          "already specified to "
 988                                                          "be %s", *jdev_name);
 989                                         return 0;
 990                                 }
 991                                 *jdev_name = arg;
 992                         }
 993                 }
 994 #ifdef CONFIG_QUOTA
 995                 if (c == 'u' || c == 'g') {
 996                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
 997
 998                         if (sb_any_quota_loaded(s) &&
 999                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1000                                 reiserfs_warning(s, "super-6511",
1001                                                  "cannot change journaled "
1002                                                  "quota options when quota "
1003                                                  "turned on.");
1004                                 return 0;
1005                         }
1006                         if (*arg) {     /* Some filename specified? */
1007                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1008                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1009                                               arg)) {
1010                                         reiserfs_warning(s, "super-6512",
1011                                                          "%s quota file "
1012                                                          "already specified.",
1013                                                          QTYPE2NAME(qtype));
1014                                         return 0;
1015                                 }
1016                                 if (strchr(arg, '/')) {
1017                                         reiserfs_warning(s, "super-6513",
1018                                                          "quotafile must be "
1019                                                          "on filesystem root.");
1020                                         return 0;
1021                                 }
1022                                 qf_names[qtype] =
1023                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1024                                 if (!qf_names[qtype]) {
1025                                         reiserfs_warning(s, "reiserfs-2502",
1026                                                          "not enough memory "
1027                                                          "for storing "
1028                                                          "quotafile name.");
1029                                         return 0;
1030                                 }
1031                                 strcpy(qf_names[qtype], arg);
1032                                 *mount_options |= 1 << REISERFS_QUOTA;
1033                         } else {
1034                                 if (qf_names[qtype] !=
1035                                     REISERFS_SB(s)->s_qf_names[qtype])
1036                                         kfree(qf_names[qtype]);
1037                                 qf_names[qtype] = NULL;
1038                         }
1039                 }
1040                 if (c == 'f') {
1041                         if (!strcmp(arg, "vfsold"))
1042                                 *qfmt = QFMT_VFS_OLD;
1043                         else if (!strcmp(arg, "vfsv0"))
1044                                 *qfmt = QFMT_VFS_V0;
1045                         else {
1046                                 reiserfs_warning(s, "super-6514",
1047                                                  "unknown quota format "
1048                                                  "specified.");
1049                                 return 0;
1050                         }
1051                         if (sb_any_quota_loaded(s) &&
1052                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1053                                 reiserfs_warning(s, "super-6515",
1054                                                  "cannot change journaled "
1055                                                  "quota options when quota "
1056                                                  "turned on.");
1057                                 return 0;
1058                         }
1059                 }
1060 #else
1061                 if (c == 'u' || c == 'g' || c == 'f') {
1062                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1063                                          "quota options not supported.");
1064                         return 0;
1065                 }
1066 #endif
1067         }
1068
1069 #ifdef CONFIG_QUOTA
1070         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1071             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1072                 reiserfs_warning(s, "super-6515",
1073                                  "journaled quota format not specified.");
1074                 return 0;
1075         }
1076         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1077         if (!(*mount_options & (1 << REISERFS_QUOTA))
1078             && sb_any_quota_loaded(s)) {
1079                 reiserfs_warning(s, "super-6516", "quota options must "
1080                                  "be present when quota is turned on.");
1081                 return 0;
1082         }
1083 #endif
1084
1085         return 1;
1086 }
1087
1088 static void switch_data_mode(struct super_block *s, unsigned long mode)
1089 {
1090         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1091                                          (1 << REISERFS_DATA_ORDERED) |
1092                                          (1 << REISERFS_DATA_WRITEBACK));
1093         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1094 }
1095
1096 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1097 {
1098         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1099                 if (!reiserfs_data_log(s)) {
1100                         switch_data_mode(s, REISERFS_DATA_LOG);
1101                         reiserfs_info(s, "switching to journaled data mode\n");
1102                 }
1103         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1104                 if (!reiserfs_data_ordered(s)) {
1105                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1106                         reiserfs_info(s, "switching to ordered data mode\n");
1107                 }
1108         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1109                 if (!reiserfs_data_writeback(s)) {
1110                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1111                         reiserfs_info(s, "switching to writeback data mode\n");
1112                 }
1113         }
1114 }
1115
1116 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1117 {
1118         int flush = (1 << REISERFS_BARRIER_FLUSH);
1119         int none = (1 << REISERFS_BARRIER_NONE);
1120         int all_barrier = flush | none;
1121
1122         if (bits & all_barrier) {
1123                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1124                 if (bits & flush) {
1125                         REISERFS_SB(s)->s_mount_opt |= flush;
1126                         printk("reiserfs: enabling write barrier flush mode\n");
1127                 } else if (bits & none) {
1128                         REISERFS_SB(s)->s_mount_opt |= none;
1129                         printk("reiserfs: write barriers turned off\n");
1130                 }
1131         }
1132 }
1133
1134 static void handle_attrs(struct super_block *s)
1135 {
1136         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1137
1138         if (reiserfs_attrs(s)) {
1139                 if (old_format_only(s)) {
1140                         reiserfs_warning(s, "super-6517", "cannot support "
1141                                          "attributes on 3.5.x disk format");
1142                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1143                         return;
1144                 }
1145                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1146                         reiserfs_warning(s, "super-6518", "cannot support "
1147                                          "attributes until flag is set in "
1148                                          "super-block");
1149                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1150                 }
1151         }
1152 }
1153
1154 #ifdef CONFIG_QUOTA
1155 static void handle_quota_files(struct super_block *s, char **qf_names,
1156                                unsigned int *qfmt)
1157 {
1158         int i;
1159
1160         for (i = 0; i < MAXQUOTAS; i++) {
1161                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1162                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1163                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1164         }
1165         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1166 }
1167 #endif
1168
1169 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1170 {
1171         struct reiserfs_super_block *rs;
1172         struct reiserfs_transaction_handle th;
1173         unsigned long blocks;
1174         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1175         unsigned long safe_mask = 0;
1176         unsigned int commit_max_age = (unsigned int)-1;
1177         struct reiserfs_journal *journal = SB_JOURNAL(s);
1178         char *new_opts = kstrdup(arg, GFP_KERNEL);
1179         int err;
1180         char *qf_names[MAXQUOTAS];
1181         unsigned int qfmt = 0;
1182 #ifdef CONFIG_QUOTA
1183         int i;
1184 #endif
1185
1186         reiserfs_write_lock(s);
1187
1188 #ifdef CONFIG_QUOTA
1189         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1190 #endif
1191
1192         rs = SB_DISK_SUPER_BLOCK(s);
1193
1194         if (!reiserfs_parse_options
1195             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1196             qf_names, &qfmt)) {
1197 #ifdef CONFIG_QUOTA
1198                 for (i = 0; i < MAXQUOTAS; i++)
1199                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1200                                 kfree(qf_names[i]);
1201 #endif
1202                 err = -EINVAL;
1203                 goto out_err;
1204         }
1205 #ifdef CONFIG_QUOTA
1206         handle_quota_files(s, qf_names, &qfmt);
1207 #endif
1208
1209         handle_attrs(s);
1210
1211         /* Add options that are safe here */
1212         safe_mask |= 1 << REISERFS_SMALLTAIL;
1213         safe_mask |= 1 << REISERFS_LARGETAIL;
1214         safe_mask |= 1 << REISERFS_NO_BORDER;
1215         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1216         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1217         safe_mask |= 1 << REISERFS_TEST4;
1218         safe_mask |= 1 << REISERFS_ATTRS;
1219         safe_mask |= 1 << REISERFS_XATTRS_USER;
1220         safe_mask |= 1 << REISERFS_POSIXACL;
1221         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1222         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1223         safe_mask |= 1 << REISERFS_ERROR_RO;
1224         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1225         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1226         safe_mask |= 1 << REISERFS_QUOTA;
1227
1228         /* Update the bitmask, taking care to keep
1229          * the bits we're not allowed to change here */
1230         REISERFS_SB(s)->s_mount_opt =
1231             (REISERFS_SB(s)->
1232              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1233
1234         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1235                 journal->j_max_commit_age = commit_max_age;
1236                 journal->j_max_trans_age = commit_max_age;
1237         } else if (commit_max_age == 0) {
1238                 /* 0 means restore defaults. */
1239                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1240                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1241         }
1242
1243         if (blocks) {
1244                 err = reiserfs_resize(s, blocks);
1245                 if (err != 0)
1246                         goto out_err;
1247         }
1248
1249         if (*mount_flags & MS_RDONLY) {
1250                 reiserfs_xattr_init(s, *mount_flags);
1251                 /* remount read-only */
1252                 if (s->s_flags & MS_RDONLY)
1253                         /* it is read-only already */
1254                         goto out_ok;
1255
1256                 err = dquot_suspend(s, -1);
1257                 if (err < 0)
1258                         goto out_err;
1259
1260                 /* try to remount file system with read-only permissions */
1261                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1262                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1263                         goto out_ok;
1264                 }
1265
1266                 err = journal_begin(&th, s, 10);
1267                 if (err)
1268                         goto out_err;
1269
1270                 /* Mounting a rw partition read-only. */
1271                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1272                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1273                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1274         } else {
1275                 /* remount read-write */
1276                 if (!(s->s_flags & MS_RDONLY)) {
1277                         reiserfs_xattr_init(s, *mount_flags);
1278                         goto out_ok;    /* We are read-write already */
1279                 }
1280
1281                 if (reiserfs_is_journal_aborted(journal)) {
1282                         err = journal->j_errno;
1283                         goto out_err;
1284                 }
1285
1286                 handle_data_mode(s, mount_options);
1287                 handle_barrier_mode(s, mount_options);
1288                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1289                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1290                 err = journal_begin(&th, s, 10);
1291                 if (err)
1292                         goto out_err;
1293
1294                 /* Mount a partition which is read-only, read-write */
1295                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1296                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1297                 s->s_flags &= ~MS_RDONLY;
1298                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1299                 if (!old_format_only(s))
1300                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1301                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1302                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1303                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1304         }
1305         /* this will force a full flush of all journal lists */
1306         SB_JOURNAL(s)->j_must_wait = 1;
1307         err = journal_end(&th, s, 10);
1308         if (err)
1309                 goto out_err;
1310         s->s_dirt = 0;
1311
1312         if (!(*mount_flags & MS_RDONLY)) {
1313                 dquot_resume(s, -1);
1314                 finish_unfinished(s);
1315                 reiserfs_xattr_init(s, *mount_flags);
1316         }
1317
1318 out_ok:
1319         replace_mount_options(s, new_opts);
1320         reiserfs_write_unlock(s);
1321         return 0;
1322
1323 out_err:
1324         kfree(new_opts);
1325         reiserfs_write_unlock(s);
1326         return err;
1327 }
1328
1329 static int read_super_block(struct super_block *s, int offset)
1330 {
1331         struct buffer_head *bh;
1332         struct reiserfs_super_block *rs;
1333         int fs_blocksize;
1334
1335         bh = sb_bread(s, offset / s->s_blocksize);
1336         if (!bh) {
1337                 reiserfs_warning(s, "sh-2006",
1338                                  "bread failed (dev %s, block %lu, size %lu)",
1339                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1340                                  s->s_blocksize);
1341                 return 1;
1342         }
1343
1344         rs = (struct reiserfs_super_block *)bh->b_data;
1345         if (!is_any_reiserfs_magic_string(rs)) {
1346                 brelse(bh);
1347                 return 1;
1348         }
1349         //
1350         // ok, reiserfs signature (old or new) found in at the given offset
1351         //
1352         fs_blocksize = sb_blocksize(rs);
1353         brelse(bh);
1354         sb_set_blocksize(s, fs_blocksize);
1355
1356         bh = sb_bread(s, offset / s->s_blocksize);
1357         if (!bh) {
1358                 reiserfs_warning(s, "sh-2007",
1359                                  "bread failed (dev %s, block %lu, size %lu)",
1360                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1361                                  s->s_blocksize);
1362                 return 1;
1363         }
1364
1365         rs = (struct reiserfs_super_block *)bh->b_data;
1366         if (sb_blocksize(rs) != s->s_blocksize) {
1367                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1368                                  "filesystem on (dev %s, block %Lu, size %lu)",
1369                                  reiserfs_bdevname(s),
1370                                  (unsigned long long)bh->b_blocknr,
1371                                  s->s_blocksize);
1372                 brelse(bh);
1373                 return 1;
1374         }
1375
1376         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1377                 brelse(bh);
1378                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1379                                  "--rebuild-tree run detected. Please run\n"
1380                                  "reiserfsck --rebuild-tree and wait for a "
1381                                  "completion. If that fails\n"
1382                                  "get newer reiserfsprogs package");
1383                 return 1;
1384         }
1385
1386         SB_BUFFER_WITH_SB(s) = bh;
1387         SB_DISK_SUPER_BLOCK(s) = rs;
1388
1389         if (is_reiserfs_jr(rs)) {
1390                 /* magic is of non-standard journal filesystem, look at s_version to
1391                    find which format is in use */
1392                 if (sb_version(rs) == REISERFS_VERSION_2)
1393                         reiserfs_info(s, "found reiserfs format \"3.6\""
1394                                       " with non-standard journal\n");
1395                 else if (sb_version(rs) == REISERFS_VERSION_1)
1396                         reiserfs_info(s, "found reiserfs format \"3.5\""
1397                                       " with non-standard journal\n");
1398                 else {
1399                         reiserfs_warning(s, "sh-2012", "found unknown "
1400                                          "format \"%u\" of reiserfs with "
1401                                          "non-standard magic", sb_version(rs));
1402                         return 1;
1403                 }
1404         } else
1405                 /* s_version of standard format may contain incorrect information,
1406                    so we just look at the magic string */
1407                 reiserfs_info(s,
1408                               "found reiserfs format \"%s\" with standard journal\n",
1409                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1410
1411         s->s_op = &reiserfs_sops;
1412         s->s_export_op = &reiserfs_export_ops;
1413 #ifdef CONFIG_QUOTA
1414         s->s_qcop = &reiserfs_qctl_operations;
1415         s->dq_op = &reiserfs_quota_operations;
1416 #endif
1417
1418         /* new format is limited by the 32 bit wide i_blocks field, want to
1419          ** be one full block below that.
1420          */
1421         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1422         return 0;
1423 }
1424
1425 /* after journal replay, reread all bitmap and super blocks */
1426 static int reread_meta_blocks(struct super_block *s)
1427 {
1428         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1429         reiserfs_write_unlock(s);
1430         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1431         reiserfs_write_lock(s);
1432         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1433                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1434                 return 1;
1435         }
1436
1437         return 0;
1438 }
1439
1440 /////////////////////////////////////////////////////
1441 // hash detection stuff
1442
1443 // if root directory is empty - we set default - Yura's - hash and
1444 // warn about it
1445 // FIXME: we look for only one name in a directory. If tea and yura
1446 // bith have the same value - we ask user to send report to the
1447 // mailing list
1448 static __u32 find_hash_out(struct super_block *s)
1449 {
1450         int retval;
1451         struct inode *inode;
1452         struct cpu_key key;
1453         INITIALIZE_PATH(path);
1454         struct reiserfs_dir_entry de;
1455         __u32 hash = DEFAULT_HASH;
1456
1457         inode = s->s_root->d_inode;
1458
1459         do {                    // Some serious "goto"-hater was there ;)
1460                 u32 teahash, r5hash, yurahash;
1461
1462                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1463                 retval = search_by_entry_key(s, &key, &path, &de);
1464                 if (retval == IO_ERROR) {
1465                         pathrelse(&path);
1466                         return UNSET_HASH;
1467                 }
1468                 if (retval == NAME_NOT_FOUND)
1469                         de.de_entry_num--;
1470                 set_de_name_and_namelen(&de);
1471                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1472                         /* allow override in this case */
1473                         if (reiserfs_rupasov_hash(s)) {
1474                                 hash = YURA_HASH;
1475                         }
1476                         reiserfs_info(s, "FS seems to be empty, autodetect "
1477                                          "is using the default hash\n");
1478                         break;
1479                 }
1480                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1481                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1482                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1483                 if (((teahash == r5hash)
1484                      &&
1485                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1486                       == r5hash)) || ((teahash == yurahash)
1487                                       && (yurahash ==
1488                                           GET_HASH_VALUE(deh_offset
1489                                                          (&
1490                                                           (de.
1491                                                            de_deh[de.
1492                                                                   de_entry_num])))))
1493                     || ((r5hash == yurahash)
1494                         && (yurahash ==
1495                             GET_HASH_VALUE(deh_offset
1496                                            (&(de.de_deh[de.de_entry_num])))))) {
1497                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1498                                          "automatically detect hash function. "
1499                                          "Please mount with -o "
1500                                          "hash={tea,rupasov,r5}");
1501                         hash = UNSET_HASH;
1502                         break;
1503                 }
1504                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1505                     yurahash)
1506                         hash = YURA_HASH;
1507                 else if (GET_HASH_VALUE
1508                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1509                         hash = TEA_HASH;
1510                 else if (GET_HASH_VALUE
1511                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1512                         hash = R5_HASH;
1513                 else {
1514                         reiserfs_warning(s, "reiserfs-2506",
1515                                          "Unrecognised hash function");
1516                         hash = UNSET_HASH;
1517                 }
1518         } while (0);
1519
1520         pathrelse(&path);
1521         return hash;
1522 }
1523
1524 // finds out which hash names are sorted with
1525 static int what_hash(struct super_block *s)
1526 {
1527         __u32 code;
1528
1529         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1530
1531         /* reiserfs_hash_detect() == true if any of the hash mount options
1532          ** were used.  We must check them to make sure the user isn't
1533          ** using a bad hash value
1534          */
1535         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1536                 code = find_hash_out(s);
1537
1538         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1539                 /* detection has found the hash, and we must check against the
1540                  ** mount options
1541                  */
1542                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1543                         reiserfs_warning(s, "reiserfs-2507",
1544                                          "Error, %s hash detected, "
1545                                          "unable to force rupasov hash",
1546                                          reiserfs_hashname(code));
1547                         code = UNSET_HASH;
1548                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1549                         reiserfs_warning(s, "reiserfs-2508",
1550                                          "Error, %s hash detected, "
1551                                          "unable to force tea hash",
1552                                          reiserfs_hashname(code));
1553                         code = UNSET_HASH;
1554                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1555                         reiserfs_warning(s, "reiserfs-2509",
1556                                          "Error, %s hash detected, "
1557                                          "unable to force r5 hash",
1558                                          reiserfs_hashname(code));
1559                         code = UNSET_HASH;
1560                 }
1561         } else {
1562                 /* find_hash_out was not called or could not determine the hash */
1563                 if (reiserfs_rupasov_hash(s)) {
1564                         code = YURA_HASH;
1565                 } else if (reiserfs_tea_hash(s)) {
1566                         code = TEA_HASH;
1567                 } else if (reiserfs_r5_hash(s)) {
1568                         code = R5_HASH;
1569                 }
1570         }
1571
1572         /* if we are mounted RW, and we have a new valid hash code, update
1573          ** the super
1574          */
1575         if (code != UNSET_HASH &&
1576             !(s->s_flags & MS_RDONLY) &&
1577             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1578                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1579         }
1580         return code;
1581 }
1582
1583 // return pointer to appropriate function
1584 static hashf_t hash_function(struct super_block *s)
1585 {
1586         switch (what_hash(s)) {
1587         case TEA_HASH:
1588                 reiserfs_info(s, "Using tea hash to sort names\n");
1589                 return keyed_hash;
1590         case YURA_HASH:
1591                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1592                 return yura_hash;
1593         case R5_HASH:
1594                 reiserfs_info(s, "Using r5 hash to sort names\n");
1595                 return r5_hash;
1596         }
1597         return NULL;
1598 }
1599
1600 // this is used to set up correct value for old partitions
1601 static int function2code(hashf_t func)
1602 {
1603         if (func == keyed_hash)
1604                 return TEA_HASH;
1605         if (func == yura_hash)
1606                 return YURA_HASH;
1607         if (func == r5_hash)
1608                 return R5_HASH;
1609
1610         BUG();                  // should never happen
1611
1612         return 0;
1613 }
1614
1615 #define SWARN(silent, s, id, ...)                       \
1616         if (!(silent))                          \
1617                 reiserfs_warning(s, id, __VA_ARGS__)
1618
1619 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1620 {
1621         struct inode *root_inode;
1622         struct reiserfs_transaction_handle th;
1623         int old_format = 0;
1624         unsigned long blocks;
1625         unsigned int commit_max_age = 0;
1626         int jinit_done = 0;
1627         struct reiserfs_iget_args args;
1628         struct reiserfs_super_block *rs;
1629         char *jdev_name;
1630         struct reiserfs_sb_info *sbi;
1631         int errval = -EINVAL;
1632         char *qf_names[MAXQUOTAS] = {};
1633         unsigned int qfmt = 0;
1634
1635         save_mount_options(s, data);
1636
1637         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1638         if (!sbi)
1639                 return -ENOMEM;
1640         s->s_fs_info = sbi;
1641         /* Set default values for options: non-aggressive tails, RO on errors */
1642         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1643         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1644         /* no preallocation minimum, be smart in
1645            reiserfs_file_write instead */
1646         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1647         /* Preallocate by 16 blocks (17-1) at once */
1648         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1649         /* setup default block allocator options */
1650         reiserfs_init_alloc_options(s);
1651
1652         mutex_init(&REISERFS_SB(s)->lock);
1653         REISERFS_SB(s)->lock_depth = -1;
1654
1655         /*
1656          * This function is called with the bkl, which also was the old
1657          * locking used here.
1658          * do_journal_begin() will soon check if we hold the lock (ie: was the
1659          * bkl). This is likely because do_journal_begin() has several another
1660          * callers because at this time, it doesn't seem to be necessary to
1661          * protect against anything.
1662          * Anyway, let's be conservative and lock for now.
1663          */
1664         reiserfs_write_lock(s);
1665
1666         jdev_name = NULL;
1667         if (reiserfs_parse_options
1668             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1669              &commit_max_age, qf_names, &qfmt) == 0) {
1670                 goto error;
1671         }
1672 #ifdef CONFIG_QUOTA
1673         handle_quota_files(s, qf_names, &qfmt);
1674 #endif
1675
1676         if (blocks) {
1677                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1678                 goto error;
1679         }
1680
1681         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1682         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1683                 old_format = 1;
1684         /* try new format (64-th 1k block), which can contain reiserfs super block */
1685         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1686                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1687                       reiserfs_bdevname(s));
1688                 goto error;
1689         }
1690
1691         rs = SB_DISK_SUPER_BLOCK(s);
1692         /* Let's do basic sanity check to verify that underlying device is not
1693            smaller than the filesystem. If the check fails then abort and scream,
1694            because bad stuff will happen otherwise. */
1695         if (s->s_bdev && s->s_bdev->bd_inode
1696             && i_size_read(s->s_bdev->bd_inode) <
1697             sb_block_count(rs) * sb_blocksize(rs)) {
1698                 SWARN(silent, s, "", "Filesystem cannot be "
1699                       "mounted because it is bigger than the device");
1700                 SWARN(silent, s, "", "You may need to run fsck "
1701                       "or increase size of your LVM partition");
1702                 SWARN(silent, s, "", "Or may be you forgot to "
1703                       "reboot after fdisk when it told you to");
1704                 goto error;
1705         }
1706
1707         sbi->s_mount_state = SB_REISERFS_STATE(s);
1708         sbi->s_mount_state = REISERFS_VALID_FS;
1709
1710         if ((errval = reiserfs_init_bitmap_cache(s))) {
1711                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1712                 goto error;
1713         }
1714         errval = -EINVAL;
1715 #ifdef CONFIG_REISERFS_CHECK
1716         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1717         SWARN(silent, s, "", "- it is slow mode for debugging.");
1718 #endif
1719
1720         /* make data=ordered the default */
1721         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1722             !reiserfs_data_writeback(s)) {
1723                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1724         }
1725
1726         if (reiserfs_data_log(s)) {
1727                 reiserfs_info(s, "using journaled data mode\n");
1728         } else if (reiserfs_data_ordered(s)) {
1729                 reiserfs_info(s, "using ordered data mode\n");
1730         } else {
1731                 reiserfs_info(s, "using writeback data mode\n");
1732         }
1733         if (reiserfs_barrier_flush(s)) {
1734                 printk("reiserfs: using flush barriers\n");
1735         }
1736         // set_device_ro(s->s_dev, 1) ;
1737         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1738                 SWARN(silent, s, "sh-2022",
1739                       "unable to initialize journal space");
1740                 goto error;
1741         } else {
1742                 jinit_done = 1; /* once this is set, journal_release must be called
1743                                  ** if we error out of the mount
1744                                  */
1745         }
1746         if (reread_meta_blocks(s)) {
1747                 SWARN(silent, s, "jmacd-9",
1748                       "unable to reread meta blocks after journal init");
1749                 goto error;
1750         }
1751
1752         if (replay_only(s))
1753                 goto error;
1754
1755         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1756                 SWARN(silent, s, "clm-7000",
1757                       "Detected readonly device, marking FS readonly");
1758                 s->s_flags |= MS_RDONLY;
1759         }
1760         args.objectid = REISERFS_ROOT_OBJECTID;
1761         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1762         root_inode =
1763             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1764                          reiserfs_init_locked_inode, (void *)(&args));
1765         if (!root_inode) {
1766                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1767                 goto error;
1768         }
1769
1770         if (root_inode->i_state & I_NEW) {
1771                 reiserfs_read_locked_inode(root_inode, &args);
1772                 unlock_new_inode(root_inode);
1773         }
1774
1775         s->s_root = d_alloc_root(root_inode);
1776         if (!s->s_root) {
1777                 iput(root_inode);
1778                 goto error;
1779         }
1780         // define and initialize hash function
1781         sbi->s_hash_function = hash_function(s);
1782         if (sbi->s_hash_function == NULL) {
1783                 dput(s->s_root);
1784                 s->s_root = NULL;
1785                 goto error;
1786         }
1787
1788         if (is_reiserfs_3_5(rs)
1789             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1790                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1791         else if (old_format)
1792                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1793         else
1794                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1795
1796         if (!(s->s_flags & MS_RDONLY)) {
1797
1798                 errval = journal_begin(&th, s, 1);
1799                 if (errval) {
1800                         dput(s->s_root);
1801                         s->s_root = NULL;
1802                         goto error;
1803                 }
1804                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1805
1806                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1807                 set_sb_fs_state(rs, 0);
1808
1809                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1810                  * case, but older revisions can't. This will cause the
1811                  * file system to fail mount on those older implementations,
1812                  * avoiding corruption. -jeffm */
1813                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1814                     sb_bmap_nr(rs) != 0) {
1815                         reiserfs_warning(s, "super-2030", "This file system "
1816                                         "claims to use %u bitmap blocks in "
1817                                         "its super block, but requires %u. "
1818                                         "Clearing to zero.", sb_bmap_nr(rs),
1819                                         reiserfs_bmap_count(s));
1820
1821                         set_sb_bmap_nr(rs, 0);
1822                 }
1823
1824                 if (old_format_only(s)) {
1825                         /* filesystem of format 3.5 either with standard or non-standard
1826                            journal */
1827                         if (convert_reiserfs(s)) {
1828                                 /* and -o conv is given */
1829                                 if (!silent)
1830                                         reiserfs_info(s,
1831                                                       "converting 3.5 filesystem to the 3.6 format");
1832
1833                                 if (is_reiserfs_3_5(rs))
1834                                         /* put magic string of 3.6 format. 2.2 will not be able to
1835                                            mount this filesystem anymore */
1836                                         memcpy(rs->s_v1.s_magic,
1837                                                reiserfs_3_6_magic_string,
1838                                                sizeof
1839                                                (reiserfs_3_6_magic_string));
1840
1841                                 set_sb_version(rs, REISERFS_VERSION_2);
1842                                 reiserfs_convert_objectid_map_v1(s);
1843                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1844                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1845                         } else if (!silent) {
1846                                 reiserfs_info(s, "using 3.5.x disk format\n");
1847                         }
1848                 } else
1849                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1850
1851
1852                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1853                 errval = journal_end(&th, s, 1);
1854                 if (errval) {
1855                         dput(s->s_root);
1856                         s->s_root = NULL;
1857                         goto error;
1858                 }
1859
1860                 if ((errval = reiserfs_lookup_privroot(s)) ||
1861                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1862                         dput(s->s_root);
1863                         s->s_root = NULL;
1864                         goto error;
1865                 }
1866
1867                 /* look for files which were to be removed in previous session */
1868                 finish_unfinished(s);
1869         } else {
1870                 if (old_format_only(s) && !silent) {
1871                         reiserfs_info(s, "using 3.5.x disk format\n");
1872                 }
1873
1874                 if ((errval = reiserfs_lookup_privroot(s)) ||
1875                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1876                         dput(s->s_root);
1877                         s->s_root = NULL;
1878                         goto error;
1879                 }
1880         }
1881         // mark hash in super block: it could be unset. overwrite should be ok
1882         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1883
1884         handle_attrs(s);
1885
1886         reiserfs_proc_info_init(s);
1887
1888         init_waitqueue_head(&(sbi->s_wait));
1889         spin_lock_init(&sbi->bitmap_lock);
1890
1891         reiserfs_write_unlock(s);
1892
1893         return (0);
1894
1895 error:
1896         if (jinit_done) {       /* kill the commit thread, free journal ram */
1897                 journal_release_error(NULL, s);
1898         }
1899
1900         reiserfs_write_unlock(s);
1901
1902         reiserfs_free_bitmap_cache(s);
1903         if (SB_BUFFER_WITH_SB(s))
1904                 brelse(SB_BUFFER_WITH_SB(s));
1905 #ifdef CONFIG_QUOTA
1906         {
1907                 int j;
1908                 for (j = 0; j < MAXQUOTAS; j++)
1909                         kfree(qf_names[j]);
1910         }
1911 #endif
1912         kfree(sbi);
1913
1914         s->s_fs_info = NULL;
1915         return errval;
1916 }
1917
1918 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1919 {
1920         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1921
1922         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1923         buf->f_bfree = sb_free_blocks(rs);
1924         buf->f_bavail = buf->f_bfree;
1925         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1926         buf->f_bsize = dentry->d_sb->s_blocksize;
1927         /* changed to accommodate gcc folks. */
1928         buf->f_type = REISERFS_SUPER_MAGIC;
1929         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1930         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1931                                 sizeof(rs->s_uuid)/2);
1932
1933         return 0;
1934 }
1935
1936 #ifdef CONFIG_QUOTA
1937 static int reiserfs_write_dquot(struct dquot *dquot)
1938 {
1939         struct reiserfs_transaction_handle th;
1940         int ret, err;
1941
1942         reiserfs_write_lock(dquot->dq_sb);
1943         ret =
1944             journal_begin(&th, dquot->dq_sb,
1945                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1946         if (ret)
1947                 goto out;
1948         ret = dquot_commit(dquot);
1949         err =
1950             journal_end(&th, dquot->dq_sb,
1951                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1952         if (!ret && err)
1953                 ret = err;
1954       out:
1955         reiserfs_write_unlock(dquot->dq_sb);
1956         return ret;
1957 }
1958
1959 static int reiserfs_acquire_dquot(struct dquot *dquot)
1960 {
1961         struct reiserfs_transaction_handle th;
1962         int ret, err;
1963
1964         reiserfs_write_lock(dquot->dq_sb);
1965         ret =
1966             journal_begin(&th, dquot->dq_sb,
1967                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1968         if (ret)
1969                 goto out;
1970         ret = dquot_acquire(dquot);
1971         err =
1972             journal_end(&th, dquot->dq_sb,
1973                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1974         if (!ret && err)
1975                 ret = err;
1976       out:
1977         reiserfs_write_unlock(dquot->dq_sb);
1978         return ret;
1979 }
1980
1981 static int reiserfs_release_dquot(struct dquot *dquot)
1982 {
1983         struct reiserfs_transaction_handle th;
1984         int ret, err;
1985
1986         reiserfs_write_lock(dquot->dq_sb);
1987         ret =
1988             journal_begin(&th, dquot->dq_sb,
1989                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1990         if (ret) {
1991                 /* Release dquot anyway to avoid endless cycle in dqput() */
1992                 dquot_release(dquot);
1993                 goto out;
1994         }
1995         ret = dquot_release(dquot);
1996         err =
1997             journal_end(&th, dquot->dq_sb,
1998                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1999         if (!ret && err)
2000                 ret = err;
2001       out:
2002         reiserfs_write_unlock(dquot->dq_sb);
2003         return ret;
2004 }
2005
2006 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2007 {
2008         /* Are we journaling quotas? */
2009         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2010             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2011                 dquot_mark_dquot_dirty(dquot);
2012                 return reiserfs_write_dquot(dquot);
2013         } else
2014                 return dquot_mark_dquot_dirty(dquot);
2015 }
2016
2017 static int reiserfs_write_info(struct super_block *sb, int type)
2018 {
2019         struct reiserfs_transaction_handle th;
2020         int ret, err;
2021
2022         /* Data block + inode block */
2023         reiserfs_write_lock(sb);
2024         ret = journal_begin(&th, sb, 2);
2025         if (ret)
2026                 goto out;
2027         ret = dquot_commit_info(sb, type);
2028         err = journal_end(&th, sb, 2);
2029         if (!ret && err)
2030                 ret = err;
2031       out:
2032         reiserfs_write_unlock(sb);
2033         return ret;
2034 }
2035
2036 /*
2037  * Turn on quotas during mount time - we need to find the quota file and such...
2038  */
2039 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2040 {
2041         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2042                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2043 }
2044
2045 /*
2046  * Standard function to be called on quota_on
2047  */
2048 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2049                              char *name)
2050 {
2051         int err;
2052         struct path path;
2053         struct inode *inode;
2054         struct reiserfs_transaction_handle th;
2055
2056         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2057                 return -EINVAL;
2058
2059         err = kern_path(name, LOOKUP_FOLLOW, &path);
2060         if (err)
2061                 return err;
2062         /* Quotafile not on the same filesystem? */
2063         if (path.mnt->mnt_sb != sb) {
2064                 err = -EXDEV;
2065                 goto out;
2066         }
2067         inode = path.dentry->d_inode;
2068         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2069         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2070                 err = reiserfs_unpack(inode, NULL);
2071                 if (err) {
2072                         reiserfs_warning(sb, "super-6520",
2073                                 "Unpacking tail of quota file failed"
2074                                 " (%d). Cannot turn on quotas.", err);
2075                         err = -EINVAL;
2076                         goto out;
2077                 }
2078                 mark_inode_dirty(inode);
2079         }
2080         /* Journaling quota? */
2081         if (REISERFS_SB(sb)->s_qf_names[type]) {
2082                 /* Quotafile not of fs root? */
2083                 if (path.dentry->d_parent != sb->s_root)
2084                         reiserfs_warning(sb, "super-6521",
2085                                  "Quota file not on filesystem root. "
2086                                  "Journalled quota will not work.");
2087         }
2088
2089         /*
2090          * When we journal data on quota file, we have to flush journal to see
2091          * all updates to the file when we bypass pagecache...
2092          */
2093         if (reiserfs_file_data_log(inode)) {
2094                 /* Just start temporary transaction and finish it */
2095                 err = journal_begin(&th, sb, 1);
2096                 if (err)
2097                         goto out;
2098                 err = journal_end_sync(&th, sb, 1);
2099                 if (err)
2100                         goto out;
2101         }
2102         err = dquot_quota_on_path(sb, type, format_id, &path);
2103 out:
2104         path_put(&path);
2105         return err;
2106 }
2107
2108 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2109  * acquiring the locks... As quota files are never truncated and quota code
2110  * itself serializes the operations (and noone else should touch the files)
2111  * we don't have to be afraid of races */
2112 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2113                                    size_t len, loff_t off)
2114 {
2115         struct inode *inode = sb_dqopt(sb)->files[type];
2116         unsigned long blk = off >> sb->s_blocksize_bits;
2117         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2118         size_t toread;
2119         struct buffer_head tmp_bh, *bh;
2120         loff_t i_size = i_size_read(inode);
2121
2122         if (off > i_size)
2123                 return 0;
2124         if (off + len > i_size)
2125                 len = i_size - off;
2126         toread = len;
2127         while (toread > 0) {
2128                 tocopy =
2129                     sb->s_blocksize - offset <
2130                     toread ? sb->s_blocksize - offset : toread;
2131                 tmp_bh.b_state = 0;
2132                 /* Quota files are without tails so we can safely use this function */
2133                 reiserfs_write_lock(sb);
2134                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2135                 reiserfs_write_unlock(sb);
2136                 if (err)
2137                         return err;
2138                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2139                         memset(data, 0, tocopy);
2140                 else {
2141                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2142                         if (!bh)
2143                                 return -EIO;
2144                         memcpy(data, bh->b_data + offset, tocopy);
2145                         brelse(bh);
2146                 }
2147                 offset = 0;
2148                 toread -= tocopy;
2149                 data += tocopy;
2150                 blk++;
2151         }
2152         return len;
2153 }
2154
2155 /* Write to quotafile (we know the transaction is already started and has
2156  * enough credits) */
2157 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2158                                     const char *data, size_t len, loff_t off)
2159 {
2160         struct inode *inode = sb_dqopt(sb)->files[type];
2161         unsigned long blk = off >> sb->s_blocksize_bits;
2162         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2163         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2164         size_t towrite = len;
2165         struct buffer_head tmp_bh, *bh;
2166
2167         if (!current->journal_info) {
2168                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2169                         " cancelled because transaction is not started.\n",
2170                         (unsigned long long)off, (unsigned long long)len);
2171                 return -EIO;
2172         }
2173         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2174         while (towrite > 0) {
2175                 tocopy = sb->s_blocksize - offset < towrite ?
2176                     sb->s_blocksize - offset : towrite;
2177                 tmp_bh.b_state = 0;
2178                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2179                 if (err)
2180                         goto out;
2181                 if (offset || tocopy != sb->s_blocksize)
2182                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2183                 else
2184                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2185                 if (!bh) {
2186                         err = -EIO;
2187                         goto out;
2188                 }
2189                 lock_buffer(bh);
2190                 memcpy(bh->b_data + offset, data, tocopy);
2191                 flush_dcache_page(bh->b_page);
2192                 set_buffer_uptodate(bh);
2193                 unlock_buffer(bh);
2194                 reiserfs_prepare_for_journal(sb, bh, 1);
2195                 journal_mark_dirty(current->journal_info, sb, bh);
2196                 if (!journal_quota)
2197                         reiserfs_add_ordered_list(inode, bh);
2198                 brelse(bh);
2199                 offset = 0;
2200                 towrite -= tocopy;
2201                 data += tocopy;
2202                 blk++;
2203         }
2204 out:
2205         if (len == towrite) {
2206                 mutex_unlock(&inode->i_mutex);
2207                 return err;
2208         }
2209         if (inode->i_size < off + len - towrite)
2210                 i_size_write(inode, off + len - towrite);
2211         inode->i_version++;
2212         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2213         mark_inode_dirty(inode);
2214         mutex_unlock(&inode->i_mutex);
2215         return len - towrite;
2216 }
2217
2218 #endif
2219
2220 static int get_super_block(struct file_system_type *fs_type,
2221                            int flags, const char *dev_name,
2222                            void *data, struct vfsmount *mnt)
2223 {
2224         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2225                            mnt);
2226 }
2227
2228 static int __init init_reiserfs_fs(void)
2229 {
2230         int ret;
2231
2232         if ((ret = init_inodecache())) {
2233                 return ret;
2234         }
2235
2236         reiserfs_proc_info_global_init();
2237
2238         ret = register_filesystem(&reiserfs_fs_type);
2239
2240         if (ret == 0) {
2241                 return 0;
2242         }
2243
2244         reiserfs_proc_info_global_done();
2245         destroy_inodecache();
2246
2247         return ret;
2248 }
2249
2250 static void __exit exit_reiserfs_fs(void)
2251 {
2252         reiserfs_proc_info_global_done();
2253         unregister_filesystem(&reiserfs_fs_type);
2254         destroy_inodecache();
2255 }
2256
2257 struct file_system_type reiserfs_fs_type = {
2258         .owner = THIS_MODULE,
2259         .name = "reiserfs",
2260         .get_sb = get_super_block,
2261         .kill_sb = reiserfs_kill_sb,
2262         .fs_flags = FS_REQUIRES_DEV,
2263 };
2264
2265 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2266 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2267 MODULE_LICENSE("GPL");
2268
2269 module_init(init_reiserfs_fs);
2270 module_exit(exit_reiserfs_fs);