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