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

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/time.h>
  17 #include <asm/uaccess.h>
  18 #include <linux/reiserfs_fs.h>
  19 #include <linux/reiserfs_acl.h>
  20 #include <linux/reiserfs_xattr.h>
  21 #include <linux/init.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/buffer_head.h>
  24 #include <linux/exportfs.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/vfs.h>
  27 #include <linux/mnt_namespace.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.h>
  31
  32 struct file_system_type reiserfs_fs_type;
  33
  34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  37
  38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  39 {
  40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  41                         strlen(reiserfs_3_5_magic_string));
  42 }
  43
  44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  45 {
  46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  47                         strlen(reiserfs_3_6_magic_string));
  48 }
  49
  50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  51 {
  52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  53                         strlen(reiserfs_jr_magic_string));
  54 }
  55
  56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  57 {
  58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  59                 is_reiserfs_jr(rs));
  60 }
  61
  62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  64
  65 static int reiserfs_sync_fs(struct super_block *s, int wait)
  66 {
  67         if (!(s->s_flags & MS_RDONLY)) {
  68                 struct reiserfs_transaction_handle th;
  69                 reiserfs_write_lock(s);
  70                 if (!journal_begin(&th, s, 1))
  71                         if (!journal_end_sync(&th, s, 1))
  72                                 reiserfs_flush_old_commits(s);
  73                 s->s_dirt = 0;  /* Even if it's not true.
  74                                  * We'll loop forever in sync_supers otherwise */
  75                 reiserfs_write_unlock(s);
  76         } else {
  77                 s->s_dirt = 0;
  78         }
  79         return 0;
  80 }
  81
  82 static void reiserfs_write_super(struct super_block *s)
  83 {
  84         reiserfs_sync_fs(s, 1);
  85 }
  86
  87 static int reiserfs_freeze(struct super_block *s)
  88 {
  89         struct reiserfs_transaction_handle th;
  90         reiserfs_write_lock(s);
  91         if (!(s->s_flags & MS_RDONLY)) {
  92                 int err = journal_begin(&th, s, 1);
  93                 if (err) {
  94                         reiserfs_block_writes(&th);
  95                 } else {
  96                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  97                                                      1);
  98                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  99                         reiserfs_block_writes(&th);
 100                         journal_end_sync(&th, s, 1);
 101                 }
 102         }
 103         s->s_dirt = 0;
 104         reiserfs_write_unlock(s);
 105         return 0;
 106 }
 107
 108 static int reiserfs_unfreeze(struct super_block *s)
 109 {
 110         reiserfs_allow_writes(s);
 111         return 0;
 112 }
 113
 114 extern const struct in_core_key MAX_IN_CORE_KEY;
 115
 116 /* this is used to delete "save link" when there are no items of a
 117    file it points to. It can either happen if unlink is completed but
 118    "save unlink" removal, or if file has both unlink and truncate
 119    pending and as unlink completes first (because key of "save link"
 120    protecting unlink is bigger that a key lf "save link" which
 121    protects truncate), so there left no items to make truncate
 122    completion on */
 123 static int remove_save_link_only(struct super_block *s,
 124                                  struct reiserfs_key *key, int oid_free)
 125 {
 126         struct reiserfs_transaction_handle th;
 127         int err;
 128
 129         /* we are going to do one balancing */
 130         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 131         if (err)
 132                 return err;
 133
 134         reiserfs_delete_solid_item(&th, NULL, key);
 135         if (oid_free)
 136                 /* removals are protected by direct items */
 137                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 138
 139         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 140 }
 141
 142 #ifdef CONFIG_QUOTA
 143 static int reiserfs_quota_on_mount(struct super_block *, int);
 144 #endif
 145
 146 /* look for uncompleted unlinks and truncates and complete them */
 147 static int finish_unfinished(struct super_block *s)
 148 {
 149         INITIALIZE_PATH(path);
 150         struct cpu_key max_cpu_key, obj_key;
 151         struct reiserfs_key save_link_key, last_inode_key;
 152         int retval = 0;
 153         struct item_head *ih;
 154         struct buffer_head *bh;
 155         int item_pos;
 156         char *item;
 157         int done;
 158         struct inode *inode;
 159         int truncate;
 160 #ifdef CONFIG_QUOTA
 161         int i;
 162         int ms_active_set;
 163 #endif
 164
 165         /* compose key to look for "save" links */
 166         max_cpu_key.version = KEY_FORMAT_3_5;
 167         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 168         max_cpu_key.on_disk_key.k_objectid = ~0U;
 169         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 170         max_cpu_key.key_length = 3;
 171
 172         memset(&last_inode_key, 0, sizeof(last_inode_key));
 173
 174 #ifdef CONFIG_QUOTA
 175         /* Needed for iput() to work correctly and not trash data */
 176         if (s->s_flags & MS_ACTIVE) {
 177                 ms_active_set = 0;
 178         } else {
 179                 ms_active_set = 1;
 180                 s->s_flags |= MS_ACTIVE;
 181         }
 182         /* Turn on quotas so that they are updated correctly */
 183         for (i = 0; i < MAXQUOTAS; i++) {
 184                 if (REISERFS_SB(s)->s_qf_names[i]) {
 185                         int ret = reiserfs_quota_on_mount(s, i);
 186                         if (ret < 0)
 187                                 reiserfs_warning(s, "reiserfs-2500",
 188                                                  "cannot turn on journaled "
 189                                                  "quota: error %d", ret);
 190                 }
 191         }
 192 #endif
 193
 194         done = 0;
 195         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 196         while (!retval) {
 197                 retval = search_item(s, &max_cpu_key, &path);
 198                 if (retval != ITEM_NOT_FOUND) {
 199                         reiserfs_error(s, "vs-2140",
 200                                        "search_by_key returned %d", retval);
 201                         break;
 202                 }
 203
 204                 bh = get_last_bh(&path);
 205                 item_pos = get_item_pos(&path);
 206                 if (item_pos != B_NR_ITEMS(bh)) {
 207                         reiserfs_warning(s, "vs-2060",
 208                                          "wrong position found");
 209                         break;
 210                 }
 211                 item_pos--;
 212                 ih = B_N_PITEM_HEAD(bh, item_pos);
 213
 214                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 215                         /* there are no "save" links anymore */
 216                         break;
 217
 218                 save_link_key = ih->ih_key;
 219                 if (is_indirect_le_ih(ih))
 220                         truncate = 1;
 221                 else
 222                         truncate = 0;
 223
 224                 /* reiserfs_iget needs k_dirid and k_objectid only */
 225                 item = B_I_PITEM(bh, ih);
 226                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 227                 obj_key.on_disk_key.k_objectid =
 228                     le32_to_cpu(ih->ih_key.k_objectid);
 229                 obj_key.on_disk_key.k_offset = 0;
 230                 obj_key.on_disk_key.k_type = 0;
 231
 232                 pathrelse(&path);
 233
 234                 inode = reiserfs_iget(s, &obj_key);
 235                 if (!inode) {
 236                         /* the unlink almost completed, it just did not manage to remove
 237                            "save" link and release objectid */
 238                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 239                                          &obj_key);
 240                         retval = remove_save_link_only(s, &save_link_key, 1);
 241                         continue;
 242                 }
 243
 244                 if (!truncate && inode->i_nlink) {
 245                         /* file is not unlinked */
 246                         reiserfs_warning(s, "vs-2185",
 247                                          "file %K is not unlinked",
 248                                          &obj_key);
 249                         retval = remove_save_link_only(s, &save_link_key, 0);
 250                         continue;
 251                 }
 252                 vfs_dq_init(inode);
 253
 254                 if (truncate && S_ISDIR(inode->i_mode)) {
 255                         /* We got a truncate request for a dir which is impossible.
 256                            The only imaginable way is to execute unfinished truncate request
 257                            then boot into old kernel, remove the file and create dir with
 258                            the same key. */
 259                         reiserfs_warning(s, "green-2101",
 260                                          "impossible truncate on a "
 261                                          "directory %k. Please report",
 262                                          INODE_PKEY(inode));
 263                         retval = remove_save_link_only(s, &save_link_key, 0);
 264                         truncate = 0;
 265                         iput(inode);
 266                         continue;
 267                 }
 268
 269                 if (truncate) {
 270                         REISERFS_I(inode)->i_flags |=
 271                             i_link_saved_truncate_mask;
 272                         /* not completed truncate found. New size was committed together
 273                            with "save" link */
 274                         reiserfs_info(s, "Truncating %k to %Ld ..",
 275                                       INODE_PKEY(inode), inode->i_size);
 276                         reiserfs_truncate_file(inode,
 277                                                0
 278                                                /*don't update modification time */
 279                                                );
 280                         retval = remove_save_link(inode, truncate);
 281                 } else {
 282                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 283                         /* not completed unlink (rmdir) found */
 284                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 285                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 286                                         sizeof(last_inode_key))){
 287                                 last_inode_key = *INODE_PKEY(inode);
 288                                 /* removal gets completed in iput */
 289                                 retval = 0;
 290                         } else {
 291                                 reiserfs_warning(s, "super-2189", "Dead loop "
 292                                                  "in finish_unfinished "
 293                                                  "detected, just remove "
 294                                                  "save link\n");
 295                                 retval = remove_save_link_only(s,
 296                                                         &save_link_key, 0);
 297                         }
 298                 }
 299
 300                 iput(inode);
 301                 printk("done\n");
 302                 done++;
 303         }
 304         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 305
 306 #ifdef CONFIG_QUOTA
 307         /* Turn quotas off */
 308         for (i = 0; i < MAXQUOTAS; i++) {
 309                 if (sb_dqopt(s)->files[i])
 310                         vfs_quota_off(s, i, 0);
 311         }
 312         if (ms_active_set)
 313                 /* Restore the flag back */
 314                 s->s_flags &= ~MS_ACTIVE;
 315 #endif
 316         pathrelse(&path);
 317         if (done)
 318                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 319                               "Completed\n", done);
 320         return retval;
 321 }
 322
 323 /* to protect file being unlinked from getting lost we "safe" link files
 324    being unlinked. This link will be deleted in the same transaction with last
 325    item of file. mounting the filesystem we scan all these links and remove
 326    files which almost got lost */
 327 void add_save_link(struct reiserfs_transaction_handle *th,
 328                    struct inode *inode, int truncate)
 329 {
 330         INITIALIZE_PATH(path);
 331         int retval;
 332         struct cpu_key key;
 333         struct item_head ih;
 334         __le32 link;
 335
 336         BUG_ON(!th->t_trans_id);
 337
 338         /* file can only get one "save link" of each kind */
 339         RFALSE(truncate &&
 340                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 341                "saved link already exists for truncated inode %lx",
 342                (long)inode->i_ino);
 343         RFALSE(!truncate &&
 344                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 345                "saved link already exists for unlinked inode %lx",
 346                (long)inode->i_ino);
 347
 348         /* setup key of "save" link */
 349         key.version = KEY_FORMAT_3_5;
 350         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 351         key.on_disk_key.k_objectid = inode->i_ino;
 352         if (!truncate) {
 353                 /* unlink, rmdir, rename */
 354                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 355                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 356
 357                 /* item head of "safe" link */
 358                 make_le_item_head(&ih, &key, key.version,
 359                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 360                                   4 /*length */ , 0xffff /*free space */ );
 361         } else {
 362                 /* truncate */
 363                 if (S_ISDIR(inode->i_mode))
 364                         reiserfs_warning(inode->i_sb, "green-2102",
 365                                          "Adding a truncate savelink for "
 366                                          "a directory %k! Please report",
 367                                          INODE_PKEY(inode));
 368                 set_cpu_key_k_offset(&key, 1);
 369                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 370
 371                 /* item head of "safe" link */
 372                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 373                                   4 /*length */ , 0 /*free space */ );
 374         }
 375         key.key_length = 3;
 376
 377         /* look for its place in the tree */
 378         retval = search_item(inode->i_sb, &key, &path);
 379         if (retval != ITEM_NOT_FOUND) {
 380                 if (retval != -ENOSPC)
 381                         reiserfs_error(inode->i_sb, "vs-2100",
 382                                        "search_by_key (%K) returned %d", &key,
 383                                        retval);
 384                 pathrelse(&path);
 385                 return;
 386         }
 387
 388         /* body of "save" link */
 389         link = INODE_PKEY(inode)->k_dir_id;
 390
 391         /* put "save" link inot tree, don't charge quota to anyone */
 392         retval =
 393             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 394         if (retval) {
 395                 if (retval != -ENOSPC)
 396                         reiserfs_error(inode->i_sb, "vs-2120",
 397                                        "insert_item returned %d", retval);
 398         } else {
 399                 if (truncate)
 400                         REISERFS_I(inode)->i_flags |=
 401                             i_link_saved_truncate_mask;
 402                 else
 403                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 404         }
 405 }
 406
 407 /* this opens transaction unlike add_save_link */
 408 int remove_save_link(struct inode *inode, int truncate)
 409 {
 410         struct reiserfs_transaction_handle th;
 411         struct reiserfs_key key;
 412         int err;
 413
 414         /* we are going to do one balancing only */
 415         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 416         if (err)
 417                 return err;
 418
 419         /* setup key of "save" link */
 420         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 421         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 422         if (!truncate) {
 423                 /* unlink, rmdir, rename */
 424                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 425                                     1 + inode->i_sb->s_blocksize);
 426                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 427         } else {
 428                 /* truncate */
 429                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 430                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 431         }
 432
 433         if ((truncate &&
 434              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 435             (!truncate &&
 436              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 437                 /* don't take quota bytes from anywhere */
 438                 reiserfs_delete_solid_item(&th, NULL, &key);
 439         if (!truncate) {
 440                 reiserfs_release_objectid(&th, inode->i_ino);
 441                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 442         } else
 443                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 444
 445         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 446 }
 447
 448 static void reiserfs_kill_sb(struct super_block *s)
 449 {
 450         if (REISERFS_SB(s)) {
 451                 if (REISERFS_SB(s)->xattr_root) {
 452                         d_invalidate(REISERFS_SB(s)->xattr_root);
 453                         dput(REISERFS_SB(s)->xattr_root);
 454                         REISERFS_SB(s)->xattr_root = NULL;
 455                 }
 456                 if (REISERFS_SB(s)->priv_root) {
 457                         d_invalidate(REISERFS_SB(s)->priv_root);
 458                         dput(REISERFS_SB(s)->priv_root);
 459                         REISERFS_SB(s)->priv_root = NULL;
 460                 }
 461         }
 462
 463         kill_block_super(s);
 464 }
 465
 466 static void reiserfs_put_super(struct super_block *s)
 467 {
 468         struct reiserfs_transaction_handle th;
 469         th.t_trans_id = 0;
 470
 471         /* change file system state to current state if it was mounted with read-write permissions */
 472         if (!(s->s_flags & MS_RDONLY)) {
 473                 if (!journal_begin(&th, s, 10)) {
 474                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 475                                                      1);
 476                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 477                                             REISERFS_SB(s)->s_mount_state);
 478                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 479                 }
 480         }
 481
 482         /* note, journal_release checks for readonly mount, and can decide not
 483          ** to do a journal_end
 484          */
 485         journal_release(&th, s);
 486
 487         reiserfs_free_bitmap_cache(s);
 488
 489         brelse(SB_BUFFER_WITH_SB(s));
 490
 491         print_statistics(s);
 492
 493         if (REISERFS_SB(s)->reserved_blocks != 0) {
 494                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 495                                  REISERFS_SB(s)->reserved_blocks);
 496         }
 497
 498         reiserfs_proc_info_done(s);
 499
 500         kfree(s->s_fs_info);
 501         s->s_fs_info = NULL;
 502
 503         return;
 504 }
 505
 506 static struct kmem_cache *reiserfs_inode_cachep;
 507
 508 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 509 {
 510         struct reiserfs_inode_info *ei;
 511         ei = (struct reiserfs_inode_info *)
 512             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 513         if (!ei)
 514                 return NULL;
 515         return &ei->vfs_inode;
 516 }
 517
 518 static void reiserfs_destroy_inode(struct inode *inode)
 519 {
 520         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 521 }
 522
 523 static void init_once(void *foo)
 524 {
 525         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 526
 527         INIT_LIST_HEAD(&ei->i_prealloc_list);
 528         inode_init_once(&ei->vfs_inode);
 529 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 530         ei->i_acl_access = NULL;
 531         ei->i_acl_default = NULL;
 532 #endif
 533 }
 534
 535 static int init_inodecache(void)
 536 {
 537         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 538                                                   sizeof(struct
 539                                                          reiserfs_inode_info),
 540                                                   0, (SLAB_RECLAIM_ACCOUNT|
 541                                                         SLAB_MEM_SPREAD),
 542                                                   init_once);
 543         if (reiserfs_inode_cachep == NULL)
 544                 return -ENOMEM;
 545         return 0;
 546 }
 547
 548 static void destroy_inodecache(void)
 549 {
 550         kmem_cache_destroy(reiserfs_inode_cachep);
 551 }
 552
 553 /* we don't mark inodes dirty, we just log them */
 554 static void reiserfs_dirty_inode(struct inode *inode)
 555 {
 556         struct reiserfs_transaction_handle th;
 557
 558         int err = 0;
 559         if (inode->i_sb->s_flags & MS_RDONLY) {
 560                 reiserfs_warning(inode->i_sb, "clm-6006",
 561                                  "writing inode %lu on readonly FS",
 562                                  inode->i_ino);
 563                 return;
 564         }
 565         reiserfs_write_lock(inode->i_sb);
 566
 567         /* this is really only used for atime updates, so they don't have
 568          ** to be included in O_SYNC or fsync
 569          */
 570         err = journal_begin(&th, inode->i_sb, 1);
 571         if (err) {
 572                 reiserfs_write_unlock(inode->i_sb);
 573                 return;
 574         }
 575         reiserfs_update_sd(&th, inode);
 576         journal_end(&th, inode->i_sb, 1);
 577         reiserfs_write_unlock(inode->i_sb);
 578 }
 579
 580 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 581 static void reiserfs_clear_inode(struct inode *inode)
 582 {
 583         struct posix_acl *acl;
 584
 585         acl = REISERFS_I(inode)->i_acl_access;
 586         if (acl && !IS_ERR(acl))
 587                 posix_acl_release(acl);
 588         REISERFS_I(inode)->i_acl_access = NULL;
 589
 590         acl = REISERFS_I(inode)->i_acl_default;
 591         if (acl && !IS_ERR(acl))
 592                 posix_acl_release(acl);
 593         REISERFS_I(inode)->i_acl_default = NULL;
 594 }
 595 #else
 596 #define reiserfs_clear_inode NULL
 597 #endif
 598
 599 #ifdef CONFIG_QUOTA
 600 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 601                                     size_t, loff_t);
 602 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 603                                    loff_t);
 604 #endif
 605
 606 static const struct super_operations reiserfs_sops = {
 607         .alloc_inode = reiserfs_alloc_inode,
 608         .destroy_inode = reiserfs_destroy_inode,
 609         .write_inode = reiserfs_write_inode,
 610         .dirty_inode = reiserfs_dirty_inode,
 611         .delete_inode = reiserfs_delete_inode,
 612         .clear_inode = reiserfs_clear_inode,
 613         .put_super = reiserfs_put_super,
 614         .write_super = reiserfs_write_super,
 615         .sync_fs = reiserfs_sync_fs,
 616         .freeze_fs = reiserfs_freeze,
 617         .unfreeze_fs = reiserfs_unfreeze,
 618         .statfs = reiserfs_statfs,
 619         .remount_fs = reiserfs_remount,
 620         .show_options = generic_show_options,
 621 #ifdef CONFIG_QUOTA
 622         .quota_read = reiserfs_quota_read,
 623         .quota_write = reiserfs_quota_write,
 624 #endif
 625 };
 626
 627 #ifdef CONFIG_QUOTA
 628 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 629
 630 static int reiserfs_write_dquot(struct dquot *);
 631 static int reiserfs_acquire_dquot(struct dquot *);
 632 static int reiserfs_release_dquot(struct dquot *);
 633 static int reiserfs_mark_dquot_dirty(struct dquot *);
 634 static int reiserfs_write_info(struct super_block *, int);
 635 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
 636
 637 static struct dquot_operations reiserfs_quota_operations = {
 638         .initialize = dquot_initialize,
 639         .drop = dquot_drop,
 640         .alloc_space = dquot_alloc_space,
 641         .alloc_inode = dquot_alloc_inode,
 642         .free_space = dquot_free_space,
 643         .free_inode = dquot_free_inode,
 644         .transfer = dquot_transfer,
 645         .write_dquot = reiserfs_write_dquot,
 646         .acquire_dquot = reiserfs_acquire_dquot,
 647         .release_dquot = reiserfs_release_dquot,
 648         .mark_dirty = reiserfs_mark_dquot_dirty,
 649         .write_info = reiserfs_write_info,
 650         .alloc_dquot    = dquot_alloc,
 651         .destroy_dquot  = dquot_destroy,
 652 };
 653
 654 static struct quotactl_ops reiserfs_qctl_operations = {
 655         .quota_on = reiserfs_quota_on,
 656         .quota_off = vfs_quota_off,
 657         .quota_sync = vfs_quota_sync,
 658         .get_info = vfs_get_dqinfo,
 659         .set_info = vfs_set_dqinfo,
 660         .get_dqblk = vfs_get_dqblk,
 661         .set_dqblk = vfs_set_dqblk,
 662 };
 663 #endif
 664
 665 static const struct export_operations reiserfs_export_ops = {
 666         .encode_fh = reiserfs_encode_fh,
 667         .fh_to_dentry = reiserfs_fh_to_dentry,
 668         .fh_to_parent = reiserfs_fh_to_parent,
 669         .get_parent = reiserfs_get_parent,
 670 };
 671
 672 /* this struct is used in reiserfs_getopt () for containing the value for those
 673    mount options that have values rather than being toggles. */
 674 typedef struct {
 675         char *value;
 676         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 677                                    value is found, 0 is no bits are to be changed. */
 678         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 679                                    value is found, 0 is no bits are to be changed. This is
 680                                    applied BEFORE setmask */
 681 } arg_desc_t;
 682
 683 /* Set this bit in arg_required to allow empty arguments */
 684 #define REISERFS_OPT_ALLOWEMPTY 31
 685
 686 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 687    mount options */
 688 typedef struct {
 689         char *option_name;
 690         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 691         const arg_desc_t *values;       /* list of values accepted by an option */
 692         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 693                                    value is found, 0 is no bits are to be changed. */
 694         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 695                                    value is found, 0 is no bits are to be changed. This is
 696                                    applied BEFORE setmask */
 697 } opt_desc_t;
 698
 699 /* possible values for -o data= */
 700 static const arg_desc_t logging_mode[] = {
 701         {"ordered", 1 << REISERFS_DATA_ORDERED,
 702          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 703         {"journal", 1 << REISERFS_DATA_LOG,
 704          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 705         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 706          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 707         {.value = NULL}
 708 };
 709
 710 /* possible values for -o barrier= */
 711 static const arg_desc_t barrier_mode[] = {
 712         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 713         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 714         {.value = NULL}
 715 };
 716
 717 /* possible values for "-o block-allocator=" and bits which are to be set in
 718    s_mount_opt of reiserfs specific part of in-core super block */
 719 static const arg_desc_t balloc[] = {
 720         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 721         {"border", 0, 1 << REISERFS_NO_BORDER},
 722         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 723         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 724         {"test4", 1 << REISERFS_TEST4, 0},
 725         {"notest4", 0, 1 << REISERFS_TEST4},
 726         {NULL, 0, 0}
 727 };
 728
 729 static const arg_desc_t tails[] = {
 730         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 731         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 732         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 733         {NULL, 0, 0}
 734 };
 735
 736 static const arg_desc_t error_actions[] = {
 737         {"panic", 1 << REISERFS_ERROR_PANIC,
 738          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 739         {"ro-remount", 1 << REISERFS_ERROR_RO,
 740          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 741 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 742         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 743          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 744 #endif
 745         {NULL, 0, 0},
 746 };
 747
 748 /* proceed only one option from a list *cur - string containing of mount options
 749    opts - array of options which are accepted
 750    opt_arg - if option is found and requires an argument and if it is specifed
 751    in the input - pointer to the argument is stored here
 752    bit_flags - if option requires to set a certain bit - it is set here
 753    return -1 if unknown option is found, opt->arg_required otherwise */
 754 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 755                            char **opt_arg, unsigned long *bit_flags)
 756 {
 757         char *p;
 758         /* foo=bar,
 759            ^   ^  ^
 760            |   |  +-- option_end
 761            |   +-- arg_start
 762            +-- option_start
 763          */
 764         const opt_desc_t *opt;
 765         const arg_desc_t *arg;
 766
 767         p = *cur;
 768
 769         /* assume argument cannot contain commas */
 770         *cur = strchr(p, ',');
 771         if (*cur) {
 772                 *(*cur) = '\0';
 773                 (*cur)++;
 774         }
 775
 776         if (!strncmp(p, "alloc=", 6)) {
 777                 /* Ugly special case, probably we should redo options parser so that
 778                    it can understand several arguments for some options, also so that
 779                    it can fill several bitfields with option values. */
 780                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 781                         return -1;
 782                 } else {
 783                         return 0;
 784                 }
 785         }
 786
 787         /* for every option in the list */
 788         for (opt = opts; opt->option_name; opt++) {
 789                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 790                         if (bit_flags) {
 791                                 if (opt->clrmask ==
 792                                     (1 << REISERFS_UNSUPPORTED_OPT))
 793                                         reiserfs_warning(s, "super-6500",
 794                                                          "%s not supported.\n",
 795                                                          p);
 796                                 else
 797                                         *bit_flags &= ~opt->clrmask;
 798                                 if (opt->setmask ==
 799                                     (1 << REISERFS_UNSUPPORTED_OPT))
 800                                         reiserfs_warning(s, "super-6501",
 801                                                          "%s not supported.\n",
 802                                                          p);
 803                                 else
 804                                         *bit_flags |= opt->setmask;
 805                         }
 806                         break;
 807                 }
 808         }
 809         if (!opt->option_name) {
 810                 reiserfs_warning(s, "super-6502",
 811                                  "unknown mount option \"%s\"", p);
 812                 return -1;
 813         }
 814
 815         p += strlen(opt->option_name);
 816         switch (*p) {
 817         case '=':
 818                 if (!opt->arg_required) {
 819                         reiserfs_warning(s, "super-6503",
 820                                          "the option \"%s\" does not "
 821                                          "require an argument\n",
 822                                          opt->option_name);
 823                         return -1;
 824                 }
 825                 break;
 826
 827         case 0:
 828                 if (opt->arg_required) {
 829                         reiserfs_warning(s, "super-6504",
 830                                          "the option \"%s\" requires an "
 831                                          "argument\n", opt->option_name);
 832                         return -1;
 833                 }
 834                 break;
 835         default:
 836                 reiserfs_warning(s, "super-6505",
 837                                  "head of option \"%s\" is only correct\n",
 838                                  opt->option_name);
 839                 return -1;
 840         }
 841
 842         /* move to the argument, or to next option if argument is not required */
 843         p++;
 844
 845         if (opt->arg_required
 846             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 847             && !strlen(p)) {
 848                 /* this catches "option=," if not allowed */
 849                 reiserfs_warning(s, "super-6506",
 850                                  "empty argument for \"%s\"\n",
 851                                  opt->option_name);
 852                 return -1;
 853         }
 854
 855         if (!opt->values) {
 856                 /* *=NULLopt_arg contains pointer to argument */
 857                 *opt_arg = p;
 858                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 859         }
 860
 861         /* values possible for this option are listed in opt->values */
 862         for (arg = opt->values; arg->value; arg++) {
 863                 if (!strcmp(p, arg->value)) {
 864                         if (bit_flags) {
 865                                 *bit_flags &= ~arg->clrmask;
 866                                 *bit_flags |= arg->setmask;
 867                         }
 868                         return opt->arg_required;
 869                 }
 870         }
 871
 872         reiserfs_warning(s, "super-6506",
 873                          "bad value \"%s\" for option \"%s\"\n", p,
 874                          opt->option_name);
 875         return -1;
 876 }
 877
 878 /* returns 0 if something is wrong in option string, 1 - otherwise */
 879 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 880                                   unsigned long *mount_options,
 881                                   /* after the parsing phase, contains the
 882                                      collection of bitflags defining what
 883                                      mount options were selected. */
 884                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 885                                   char **jdev_name,
 886                                   unsigned int *commit_max_age,
 887                                   char **qf_names,
 888                                   unsigned int *qfmt)
 889 {
 890         int c;
 891         char *arg = NULL;
 892         char *pos;
 893         opt_desc_t opts[] = {
 894                 /* Compatibility stuff, so that -o notail for old setups still work */
 895                 {"tails",.arg_required = 't',.values = tails},
 896                 {"notail",.clrmask =
 897                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 898                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 899                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 900                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 901                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 902 #ifdef CONFIG_REISERFS_FS_XATTR
 903                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 904                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 905 #else
 906                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 907                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 908 #endif
 909 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 910                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 911                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 912 #else
 913                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 914                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 915 #endif
 916                 {.option_name = "nolog"},
 917                 {"replayonly",.setmask = 1 << REPLAYONLY},
 918                 {"block-allocator",.arg_required = 'a',.values = balloc},
 919                 {"data",.arg_required = 'd',.values = logging_mode},
 920                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 921                 {"resize",.arg_required = 'r',.values = NULL},
 922                 {"jdev",.arg_required = 'j',.values = NULL},
 923                 {"nolargeio",.arg_required = 'w',.values = NULL},
 924                 {"commit",.arg_required = 'c',.values = NULL},
 925                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 926                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 927                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 928                 {"errors",.arg_required = 'e',.values = error_actions},
 929                 {"usrjquota",.arg_required =
 930                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 931                 {"grpjquota",.arg_required =
 932                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 933                 {"jqfmt",.arg_required = 'f',.values = NULL},
 934                 {.option_name = NULL}
 935         };
 936
 937         *blocks = 0;
 938         if (!options || !*options)
 939                 /* use default configuration: create tails, journaling on, no
 940                    conversion to newest format */
 941                 return 1;
 942
 943         for (pos = options; pos;) {
 944                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 945                 if (c == -1)
 946                         /* wrong option is given */
 947                         return 0;
 948
 949                 if (c == 'r') {
 950                         char *p;
 951
 952                         p = NULL;
 953                         /* "resize=NNN" or "resize=auto" */
 954
 955                         if (!strcmp(arg, "auto")) {
 956                                 /* From JFS code, to auto-get the size. */
 957                                 *blocks =
 958                                     s->s_bdev->bd_inode->i_size >> s->
 959                                     s_blocksize_bits;
 960                         } else {
 961                                 *blocks = simple_strtoul(arg, &p, 0);
 962                                 if (*p != '\0') {
 963                                         /* NNN does not look like a number */
 964                                         reiserfs_warning(s, "super-6507",
 965                                                          "bad value %s for "
 966                                                          "-oresize\n", arg);
 967                                         return 0;
 968                                 }
 969                         }
 970                 }
 971
 972                 if (c == 'c') {
 973                         char *p = NULL;
 974                         unsigned long val = simple_strtoul(arg, &p, 0);
 975                         /* commit=NNN (time in seconds) */
 976                         if (*p != '\0' || val >= (unsigned int)-1) {
 977                                 reiserfs_warning(s, "super-6508",
 978                                                  "bad value %s for -ocommit\n",
 979                                                  arg);
 980                                 return 0;
 981                         }
 982                         *commit_max_age = (unsigned int)val;
 983                 }
 984
 985                 if (c == 'w') {
 986                         reiserfs_warning(s, "super-6509", "nolargeio option "
 987                                          "is no longer supported");
 988                         return 0;
 989                 }
 990
 991                 if (c == 'j') {
 992                         if (arg && *arg && jdev_name) {
 993                                 if (*jdev_name) {       //Hm, already assigned?
 994                                         reiserfs_warning(s, "super-6510",
 995                                                          "journal device was "
 996                                                          "already specified to "
 997                                                          "be %s", *jdev_name);
 998                                         return 0;
 999                                 }
1000                                 *jdev_name = arg;
1001                         }
1002                 }
1003 #ifdef CONFIG_QUOTA
1004                 if (c == 'u' || c == 'g') {
1005                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1006
1007                         if (sb_any_quota_loaded(s) &&
1008                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1009                                 reiserfs_warning(s, "super-6511",
1010                                                  "cannot change journaled "
1011                                                  "quota options when quota "
1012                                                  "turned on.");
1013                                 return 0;
1014                         }
1015                         if (*arg) {     /* Some filename specified? */
1016                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1017                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1018                                               arg)) {
1019                                         reiserfs_warning(s, "super-6512",
1020                                                          "%s quota file "
1021                                                          "already specified.",
1022                                                          QTYPE2NAME(qtype));
1023                                         return 0;
1024                                 }
1025                                 if (strchr(arg, '/')) {
1026                                         reiserfs_warning(s, "super-6513",
1027                                                          "quotafile must be "
1028                                                          "on filesystem root.");
1029                                         return 0;
1030                                 }
1031                                 qf_names[qtype] =
1032                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1033                                 if (!qf_names[qtype]) {
1034                                         reiserfs_warning(s, "reiserfs-2502",
1035                                                          "not enough memory "
1036                                                          "for storing "
1037                                                          "quotafile name.");
1038                                         return 0;
1039                                 }
1040                                 strcpy(qf_names[qtype], arg);
1041                                 *mount_options |= 1 << REISERFS_QUOTA;
1042                         } else {
1043                                 if (qf_names[qtype] !=
1044                                     REISERFS_SB(s)->s_qf_names[qtype])
1045                                         kfree(qf_names[qtype]);
1046                                 qf_names[qtype] = NULL;
1047                         }
1048                 }
1049                 if (c == 'f') {
1050                         if (!strcmp(arg, "vfsold"))
1051                                 *qfmt = QFMT_VFS_OLD;
1052                         else if (!strcmp(arg, "vfsv0"))
1053                                 *qfmt = QFMT_VFS_V0;
1054                         else {
1055                                 reiserfs_warning(s, "super-6514",
1056                                                  "unknown quota format "
1057                                                  "specified.");
1058                                 return 0;
1059                         }
1060                         if (sb_any_quota_loaded(s) &&
1061                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1062                                 reiserfs_warning(s, "super-6515",
1063                                                  "cannot change journaled "
1064                                                  "quota options when quota "
1065                                                  "turned on.");
1066                                 return 0;
1067                         }
1068                 }
1069 #else
1070                 if (c == 'u' || c == 'g' || c == 'f') {
1071                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1072                                          "quota options not supported.");
1073                         return 0;
1074                 }
1075 #endif
1076         }
1077
1078 #ifdef CONFIG_QUOTA
1079         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1080             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1081                 reiserfs_warning(s, "super-6515",
1082                                  "journaled quota format not specified.");
1083                 return 0;
1084         }
1085         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1086         if (!(*mount_options & (1 << REISERFS_QUOTA))
1087             && sb_any_quota_loaded(s)) {
1088                 reiserfs_warning(s, "super-6516", "quota options must "
1089                                  "be present when quota is turned on.");
1090                 return 0;
1091         }
1092 #endif
1093
1094         return 1;
1095 }
1096
1097 static void switch_data_mode(struct super_block *s, unsigned long mode)
1098 {
1099         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1100                                          (1 << REISERFS_DATA_ORDERED) |
1101                                          (1 << REISERFS_DATA_WRITEBACK));
1102         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1103 }
1104
1105 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1106 {
1107         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1108                 if (!reiserfs_data_log(s)) {
1109                         switch_data_mode(s, REISERFS_DATA_LOG);
1110                         reiserfs_info(s, "switching to journaled data mode\n");
1111                 }
1112         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1113                 if (!reiserfs_data_ordered(s)) {
1114                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1115                         reiserfs_info(s, "switching to ordered data mode\n");
1116                 }
1117         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1118                 if (!reiserfs_data_writeback(s)) {
1119                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1120                         reiserfs_info(s, "switching to writeback data mode\n");
1121                 }
1122         }
1123 }
1124
1125 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1126 {
1127         int flush = (1 << REISERFS_BARRIER_FLUSH);
1128         int none = (1 << REISERFS_BARRIER_NONE);
1129         int all_barrier = flush | none;
1130
1131         if (bits & all_barrier) {
1132                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1133                 if (bits & flush) {
1134                         REISERFS_SB(s)->s_mount_opt |= flush;
1135                         printk("reiserfs: enabling write barrier flush mode\n");
1136                 } else if (bits & none) {
1137                         REISERFS_SB(s)->s_mount_opt |= none;
1138                         printk("reiserfs: write barriers turned off\n");
1139                 }
1140         }
1141 }
1142
1143 static void handle_attrs(struct super_block *s)
1144 {
1145         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1146
1147         if (reiserfs_attrs(s)) {
1148                 if (old_format_only(s)) {
1149                         reiserfs_warning(s, "super-6517", "cannot support "
1150                                          "attributes on 3.5.x disk format");
1151                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1152                         return;
1153                 }
1154                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1155                         reiserfs_warning(s, "super-6518", "cannot support "
1156                                          "attributes until flag is set in "
1157                                          "super-block");
1158                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1159                 }
1160         }
1161 }
1162
1163 #ifdef CONFIG_QUOTA
1164 static void handle_quota_files(struct super_block *s, char **qf_names,
1165                                unsigned int *qfmt)
1166 {
1167         int i;
1168
1169         for (i = 0; i < MAXQUOTAS; i++) {
1170                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1171                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1172                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1173         }
1174         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1175 }
1176 #endif
1177
1178 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1179 {
1180         struct reiserfs_super_block *rs;
1181         struct reiserfs_transaction_handle th;
1182         unsigned long blocks;
1183         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1184         unsigned long safe_mask = 0;
1185         unsigned int commit_max_age = (unsigned int)-1;
1186         struct reiserfs_journal *journal = SB_JOURNAL(s);
1187         char *new_opts = kstrdup(arg, GFP_KERNEL);
1188         int err;
1189         char *qf_names[MAXQUOTAS];
1190         unsigned int qfmt = 0;
1191 #ifdef CONFIG_QUOTA
1192         int i;
1193
1194         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1195 #endif
1196
1197         rs = SB_DISK_SUPER_BLOCK(s);
1198
1199         if (!reiserfs_parse_options
1200             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1201             qf_names, &qfmt)) {
1202 #ifdef CONFIG_QUOTA
1203                 for (i = 0; i < MAXQUOTAS; i++)
1204                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1205                                 kfree(qf_names[i]);
1206 #endif
1207                 err = -EINVAL;
1208                 goto out_err;
1209         }
1210 #ifdef CONFIG_QUOTA
1211         handle_quota_files(s, qf_names, &qfmt);
1212 #endif
1213
1214         handle_attrs(s);
1215
1216         /* Add options that are safe here */
1217         safe_mask |= 1 << REISERFS_SMALLTAIL;
1218         safe_mask |= 1 << REISERFS_LARGETAIL;
1219         safe_mask |= 1 << REISERFS_NO_BORDER;
1220         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1221         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1222         safe_mask |= 1 << REISERFS_TEST4;
1223         safe_mask |= 1 << REISERFS_ATTRS;
1224         safe_mask |= 1 << REISERFS_XATTRS_USER;
1225         safe_mask |= 1 << REISERFS_POSIXACL;
1226         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1227         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1228         safe_mask |= 1 << REISERFS_ERROR_RO;
1229         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1230         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1231         safe_mask |= 1 << REISERFS_QUOTA;
1232
1233         /* Update the bitmask, taking care to keep
1234          * the bits we're not allowed to change here */
1235         REISERFS_SB(s)->s_mount_opt =
1236             (REISERFS_SB(s)->
1237              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1238
1239         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1240                 journal->j_max_commit_age = commit_max_age;
1241                 journal->j_max_trans_age = commit_max_age;
1242         } else if (commit_max_age == 0) {
1243                 /* 0 means restore defaults. */
1244                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1245                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1246         }
1247
1248         if (blocks) {
1249                 err = reiserfs_resize(s, blocks);
1250                 if (err != 0)
1251                         goto out_err;
1252         }
1253
1254         if (*mount_flags & MS_RDONLY) {
1255                 reiserfs_xattr_init(s, *mount_flags);
1256                 /* remount read-only */
1257                 if (s->s_flags & MS_RDONLY)
1258                         /* it is read-only already */
1259                         goto out_ok;
1260                 /* try to remount file system with read-only permissions */
1261                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1262                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1263                         goto out_ok;
1264                 }
1265
1266                 err = journal_begin(&th, s, 10);
1267                 if (err)
1268                         goto out_err;
1269
1270                 /* Mounting a rw partition read-only. */
1271                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1272                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1273                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1274         } else {
1275                 /* remount read-write */
1276                 if (!(s->s_flags & MS_RDONLY)) {
1277                         reiserfs_xattr_init(s, *mount_flags);
1278                         goto out_ok;    /* We are read-write already */
1279                 }
1280
1281                 if (reiserfs_is_journal_aborted(journal)) {
1282                         err = journal->j_errno;
1283                         goto out_err;
1284                 }
1285
1286                 handle_data_mode(s, mount_options);
1287                 handle_barrier_mode(s, mount_options);
1288                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1289                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1290                 err = journal_begin(&th, s, 10);
1291                 if (err)
1292                         goto out_err;
1293
1294                 /* Mount a partition which is read-only, read-write */
1295                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1296                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1297                 s->s_flags &= ~MS_RDONLY;
1298                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1299                 if (!old_format_only(s))
1300                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1301                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1302                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1303                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1304         }
1305         /* this will force a full flush of all journal lists */
1306         SB_JOURNAL(s)->j_must_wait = 1;
1307         err = journal_end(&th, s, 10);
1308         if (err)
1309                 goto out_err;
1310         s->s_dirt = 0;
1311
1312         if (!(*mount_flags & MS_RDONLY)) {
1313                 finish_unfinished(s);
1314                 reiserfs_xattr_init(s, *mount_flags);
1315         }
1316
1317 out_ok:
1318         replace_mount_options(s, new_opts);
1319         return 0;
1320
1321 out_err:
1322         kfree(new_opts);
1323         return err;
1324 }
1325
1326 static int read_super_block(struct super_block *s, int offset)
1327 {
1328         struct buffer_head *bh;
1329         struct reiserfs_super_block *rs;
1330         int fs_blocksize;
1331
1332         bh = sb_bread(s, offset / s->s_blocksize);
1333         if (!bh) {
1334                 reiserfs_warning(s, "sh-2006",
1335                                  "bread failed (dev %s, block %lu, size %lu)",
1336                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1337                                  s->s_blocksize);
1338                 return 1;
1339         }
1340
1341         rs = (struct reiserfs_super_block *)bh->b_data;
1342         if (!is_any_reiserfs_magic_string(rs)) {
1343                 brelse(bh);
1344                 return 1;
1345         }
1346         //
1347         // ok, reiserfs signature (old or new) found in at the given offset
1348         //
1349         fs_blocksize = sb_blocksize(rs);
1350         brelse(bh);
1351         sb_set_blocksize(s, fs_blocksize);
1352
1353         bh = sb_bread(s, offset / s->s_blocksize);
1354         if (!bh) {
1355                 reiserfs_warning(s, "sh-2007",
1356                                  "bread failed (dev %s, block %lu, size %lu)",
1357                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1358                                  s->s_blocksize);
1359                 return 1;
1360         }
1361
1362         rs = (struct reiserfs_super_block *)bh->b_data;
1363         if (sb_blocksize(rs) != s->s_blocksize) {
1364                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1365                                  "filesystem on (dev %s, block %Lu, size %lu)",
1366                                  reiserfs_bdevname(s),
1367                                  (unsigned long long)bh->b_blocknr,
1368                                  s->s_blocksize);
1369                 brelse(bh);
1370                 return 1;
1371         }
1372
1373         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1374                 brelse(bh);
1375                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1376                                  "--rebuild-tree run detected. Please run\n"
1377                                  "reiserfsck --rebuild-tree and wait for a "
1378                                  "completion. If that fails\n"
1379                                  "get newer reiserfsprogs package");
1380                 return 1;
1381         }
1382
1383         SB_BUFFER_WITH_SB(s) = bh;
1384         SB_DISK_SUPER_BLOCK(s) = rs;
1385
1386         if (is_reiserfs_jr(rs)) {
1387                 /* magic is of non-standard journal filesystem, look at s_version to
1388                    find which format is in use */
1389                 if (sb_version(rs) == REISERFS_VERSION_2)
1390                         reiserfs_info(s, "found reiserfs format \"3.6\""
1391                                       " with non-standard journal\n");
1392                 else if (sb_version(rs) == REISERFS_VERSION_1)
1393                         reiserfs_info(s, "found reiserfs format \"3.5\""
1394                                       " with non-standard journal\n");
1395                 else {
1396                         reiserfs_warning(s, "sh-2012", "found unknown "
1397                                          "format \"%u\" of reiserfs with "
1398                                          "non-standard magic", sb_version(rs));
1399                         return 1;
1400                 }
1401         } else
1402                 /* s_version of standard format may contain incorrect information,
1403                    so we just look at the magic string */
1404                 reiserfs_info(s,
1405                               "found reiserfs format \"%s\" with standard journal\n",
1406                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1407
1408         s->s_op = &reiserfs_sops;
1409         s->s_export_op = &reiserfs_export_ops;
1410 #ifdef CONFIG_QUOTA
1411         s->s_qcop = &reiserfs_qctl_operations;
1412         s->dq_op = &reiserfs_quota_operations;
1413 #endif
1414
1415         /* new format is limited by the 32 bit wide i_blocks field, want to
1416          ** be one full block below that.
1417          */
1418         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1419         return 0;
1420 }
1421
1422 /* after journal replay, reread all bitmap and super blocks */
1423 static int reread_meta_blocks(struct super_block *s)
1424 {
1425         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1426         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1427         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1428                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1429                 return 1;
1430         }
1431
1432         return 0;
1433 }
1434
1435 /////////////////////////////////////////////////////
1436 // hash detection stuff
1437
1438 // if root directory is empty - we set default - Yura's - hash and
1439 // warn about it
1440 // FIXME: we look for only one name in a directory. If tea and yura
1441 // bith have the same value - we ask user to send report to the
1442 // mailing list
1443 static __u32 find_hash_out(struct super_block *s)
1444 {
1445         int retval;
1446         struct inode *inode;
1447         struct cpu_key key;
1448         INITIALIZE_PATH(path);
1449         struct reiserfs_dir_entry de;
1450         __u32 hash = DEFAULT_HASH;
1451
1452         inode = s->s_root->d_inode;
1453
1454         do {                    // Some serious "goto"-hater was there ;)
1455                 u32 teahash, r5hash, yurahash;
1456
1457                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1458                 retval = search_by_entry_key(s, &key, &path, &de);
1459                 if (retval == IO_ERROR) {
1460                         pathrelse(&path);
1461                         return UNSET_HASH;
1462                 }
1463                 if (retval == NAME_NOT_FOUND)
1464                         de.de_entry_num--;
1465                 set_de_name_and_namelen(&de);
1466                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1467                         /* allow override in this case */
1468                         if (reiserfs_rupasov_hash(s)) {
1469                                 hash = YURA_HASH;
1470                         }
1471                         reiserfs_info(s, "FS seems to be empty, autodetect "
1472                                          "is using the default hash\n");
1473                         break;
1474                 }
1475                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1476                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1477                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1478                 if (((teahash == r5hash)
1479                      &&
1480                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1481                       == r5hash)) || ((teahash == yurahash)
1482                                       && (yurahash ==
1483                                           GET_HASH_VALUE(deh_offset
1484                                                          (&
1485                                                           (de.
1486                                                            de_deh[de.
1487                                                                   de_entry_num])))))
1488                     || ((r5hash == yurahash)
1489                         && (yurahash ==
1490                             GET_HASH_VALUE(deh_offset
1491                                            (&(de.de_deh[de.de_entry_num])))))) {
1492                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1493                                          "automatically detect hash function. "
1494                                          "Please mount with -o "
1495                                          "hash={tea,rupasov,r5}");
1496                         hash = UNSET_HASH;
1497                         break;
1498                 }
1499                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1500                     yurahash)
1501                         hash = YURA_HASH;
1502                 else if (GET_HASH_VALUE
1503                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1504                         hash = TEA_HASH;
1505                 else if (GET_HASH_VALUE
1506                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1507                         hash = R5_HASH;
1508                 else {
1509                         reiserfs_warning(s, "reiserfs-2506",
1510                                          "Unrecognised hash function");
1511                         hash = UNSET_HASH;
1512                 }
1513         } while (0);
1514
1515         pathrelse(&path);
1516         return hash;
1517 }
1518
1519 // finds out which hash names are sorted with
1520 static int what_hash(struct super_block *s)
1521 {
1522         __u32 code;
1523
1524         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1525
1526         /* reiserfs_hash_detect() == true if any of the hash mount options
1527          ** were used.  We must check them to make sure the user isn't
1528          ** using a bad hash value
1529          */
1530         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1531                 code = find_hash_out(s);
1532
1533         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1534                 /* detection has found the hash, and we must check against the
1535                  ** mount options
1536                  */
1537                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1538                         reiserfs_warning(s, "reiserfs-2507",
1539                                          "Error, %s hash detected, "
1540                                          "unable to force rupasov hash",
1541                                          reiserfs_hashname(code));
1542                         code = UNSET_HASH;
1543                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1544                         reiserfs_warning(s, "reiserfs-2508",
1545                                          "Error, %s hash detected, "
1546                                          "unable to force tea hash",
1547                                          reiserfs_hashname(code));
1548                         code = UNSET_HASH;
1549                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1550                         reiserfs_warning(s, "reiserfs-2509",
1551                                          "Error, %s hash detected, "
1552                                          "unable to force r5 hash",
1553                                          reiserfs_hashname(code));
1554                         code = UNSET_HASH;
1555                 }
1556         } else {
1557                 /* find_hash_out was not called or could not determine the hash */
1558                 if (reiserfs_rupasov_hash(s)) {
1559                         code = YURA_HASH;
1560                 } else if (reiserfs_tea_hash(s)) {
1561                         code = TEA_HASH;
1562                 } else if (reiserfs_r5_hash(s)) {
1563                         code = R5_HASH;
1564                 }
1565         }
1566
1567         /* if we are mounted RW, and we have a new valid hash code, update
1568          ** the super
1569          */
1570         if (code != UNSET_HASH &&
1571             !(s->s_flags & MS_RDONLY) &&
1572             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1573                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1574         }
1575         return code;
1576 }
1577
1578 // return pointer to appropriate function
1579 static hashf_t hash_function(struct super_block *s)
1580 {
1581         switch (what_hash(s)) {
1582         case TEA_HASH:
1583                 reiserfs_info(s, "Using tea hash to sort names\n");
1584                 return keyed_hash;
1585         case YURA_HASH:
1586                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1587                 return yura_hash;
1588         case R5_HASH:
1589                 reiserfs_info(s, "Using r5 hash to sort names\n");
1590                 return r5_hash;
1591         }
1592         return NULL;
1593 }
1594
1595 // this is used to set up correct value for old partitions
1596 static int function2code(hashf_t func)
1597 {
1598         if (func == keyed_hash)
1599                 return TEA_HASH;
1600         if (func == yura_hash)
1601                 return YURA_HASH;
1602         if (func == r5_hash)
1603                 return R5_HASH;
1604
1605         BUG();                  // should never happen
1606
1607         return 0;
1608 }
1609
1610 #define SWARN(silent, s, id, ...)                       \
1611         if (!(silent))                          \
1612                 reiserfs_warning(s, id, __VA_ARGS__)
1613
1614 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1615 {
1616         struct inode *root_inode;
1617         struct reiserfs_transaction_handle th;
1618         int old_format = 0;
1619         unsigned long blocks;
1620         unsigned int commit_max_age = 0;
1621         int jinit_done = 0;
1622         struct reiserfs_iget_args args;
1623         struct reiserfs_super_block *rs;
1624         char *jdev_name;
1625         struct reiserfs_sb_info *sbi;
1626         int errval = -EINVAL;
1627         char *qf_names[MAXQUOTAS] = {};
1628         unsigned int qfmt = 0;
1629
1630         save_mount_options(s, data);
1631
1632         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1633         if (!sbi) {
1634                 errval = -ENOMEM;
1635                 goto error;
1636         }
1637         s->s_fs_info = sbi;
1638         /* Set default values for options: non-aggressive tails, RO on errors */
1639         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1640         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1641         /* no preallocation minimum, be smart in
1642            reiserfs_file_write instead */
1643         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1644         /* Preallocate by 16 blocks (17-1) at once */
1645         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1646         /* setup default block allocator options */
1647         reiserfs_init_alloc_options(s);
1648
1649         jdev_name = NULL;
1650         if (reiserfs_parse_options
1651             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1652              &commit_max_age, qf_names, &qfmt) == 0) {
1653                 goto error;
1654         }
1655 #ifdef CONFIG_QUOTA
1656         handle_quota_files(s, qf_names, &qfmt);
1657 #endif
1658
1659         if (blocks) {
1660                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1661                 goto error;
1662         }
1663
1664         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1665         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1666                 old_format = 1;
1667         /* try new format (64-th 1k block), which can contain reiserfs super block */
1668         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1669                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1670                       reiserfs_bdevname(s));
1671                 goto error;
1672         }
1673
1674         rs = SB_DISK_SUPER_BLOCK(s);
1675         /* Let's do basic sanity check to verify that underlying device is not
1676            smaller than the filesystem. If the check fails then abort and scream,
1677            because bad stuff will happen otherwise. */
1678         if (s->s_bdev && s->s_bdev->bd_inode
1679             && i_size_read(s->s_bdev->bd_inode) <
1680             sb_block_count(rs) * sb_blocksize(rs)) {
1681                 SWARN(silent, s, "", "Filesystem cannot be "
1682                       "mounted because it is bigger than the device");
1683                 SWARN(silent, s, "", "You may need to run fsck "
1684                       "or increase size of your LVM partition");
1685                 SWARN(silent, s, "", "Or may be you forgot to "
1686                       "reboot after fdisk when it told you to");
1687                 goto error;
1688         }
1689
1690         sbi->s_mount_state = SB_REISERFS_STATE(s);
1691         sbi->s_mount_state = REISERFS_VALID_FS;
1692
1693         if ((errval = reiserfs_init_bitmap_cache(s))) {
1694                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1695                 goto error;
1696         }
1697         errval = -EINVAL;
1698 #ifdef CONFIG_REISERFS_CHECK
1699         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1700         SWARN(silent, s, "", "- it is slow mode for debugging.");
1701 #endif
1702
1703         /* make data=ordered the default */
1704         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1705             !reiserfs_data_writeback(s)) {
1706                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1707         }
1708
1709         if (reiserfs_data_log(s)) {
1710                 reiserfs_info(s, "using journaled data mode\n");
1711         } else if (reiserfs_data_ordered(s)) {
1712                 reiserfs_info(s, "using ordered data mode\n");
1713         } else {
1714                 reiserfs_info(s, "using writeback data mode\n");
1715         }
1716         if (reiserfs_barrier_flush(s)) {
1717                 printk("reiserfs: using flush barriers\n");
1718         }
1719         // set_device_ro(s->s_dev, 1) ;
1720         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1721                 SWARN(silent, s, "sh-2022",
1722                       "unable to initialize journal space");
1723                 goto error;
1724         } else {
1725                 jinit_done = 1; /* once this is set, journal_release must be called
1726                                  ** if we error out of the mount
1727                                  */
1728         }
1729         if (reread_meta_blocks(s)) {
1730                 SWARN(silent, s, "jmacd-9",
1731                       "unable to reread meta blocks after journal init");
1732                 goto error;
1733         }
1734
1735         if (replay_only(s))
1736                 goto error;
1737
1738         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1739                 SWARN(silent, s, "clm-7000",
1740                       "Detected readonly device, marking FS readonly");
1741                 s->s_flags |= MS_RDONLY;
1742         }
1743         args.objectid = REISERFS_ROOT_OBJECTID;
1744         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1745         root_inode =
1746             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1747                          reiserfs_init_locked_inode, (void *)(&args));
1748         if (!root_inode) {
1749                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1750                 goto error;
1751         }
1752
1753         if (root_inode->i_state & I_NEW) {
1754                 reiserfs_read_locked_inode(root_inode, &args);
1755                 unlock_new_inode(root_inode);
1756         }
1757
1758         s->s_root = d_alloc_root(root_inode);
1759         if (!s->s_root) {
1760                 iput(root_inode);
1761                 goto error;
1762         }
1763         // define and initialize hash function
1764         sbi->s_hash_function = hash_function(s);
1765         if (sbi->s_hash_function == NULL) {
1766                 dput(s->s_root);
1767                 s->s_root = NULL;
1768                 goto error;
1769         }
1770
1771         if (is_reiserfs_3_5(rs)
1772             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1773                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1774         else if (old_format)
1775                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1776         else
1777                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1778
1779         if (!(s->s_flags & MS_RDONLY)) {
1780
1781                 errval = journal_begin(&th, s, 1);
1782                 if (errval) {
1783                         dput(s->s_root);
1784                         s->s_root = NULL;
1785                         goto error;
1786                 }
1787                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1788
1789                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1790                 set_sb_fs_state(rs, 0);
1791
1792                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1793                  * case, but older revisions can't. This will cause the
1794                  * file system to fail mount on those older implementations,
1795                  * avoiding corruption. -jeffm */
1796                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1797                     sb_bmap_nr(rs) != 0) {
1798                         reiserfs_warning(s, "super-2030", "This file system "
1799                                         "claims to use %u bitmap blocks in "
1800                                         "its super block, but requires %u. "
1801                                         "Clearing to zero.", sb_bmap_nr(rs),
1802                                         reiserfs_bmap_count(s));
1803
1804                         set_sb_bmap_nr(rs, 0);
1805                 }
1806
1807                 if (old_format_only(s)) {
1808                         /* filesystem of format 3.5 either with standard or non-standard
1809                            journal */
1810                         if (convert_reiserfs(s)) {
1811                                 /* and -o conv is given */
1812                                 if (!silent)
1813                                         reiserfs_info(s,
1814                                                       "converting 3.5 filesystem to the 3.6 format");
1815
1816                                 if (is_reiserfs_3_5(rs))
1817                                         /* put magic string of 3.6 format. 2.2 will not be able to
1818                                            mount this filesystem anymore */
1819                                         memcpy(rs->s_v1.s_magic,
1820                                                reiserfs_3_6_magic_string,
1821                                                sizeof
1822                                                (reiserfs_3_6_magic_string));
1823
1824                                 set_sb_version(rs, REISERFS_VERSION_2);
1825                                 reiserfs_convert_objectid_map_v1(s);
1826                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1827                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1828                         } else if (!silent) {
1829                                 reiserfs_info(s, "using 3.5.x disk format\n");
1830                         }
1831                 } else
1832                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1833
1834
1835                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1836                 errval = journal_end(&th, s, 1);
1837                 if (errval) {
1838                         dput(s->s_root);
1839                         s->s_root = NULL;
1840                         goto error;
1841                 }
1842
1843                 if ((errval = reiserfs_lookup_privroot(s)) ||
1844                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1845                         dput(s->s_root);
1846                         s->s_root = NULL;
1847                         goto error;
1848                 }
1849
1850                 /* look for files which were to be removed in previous session */
1851                 finish_unfinished(s);
1852         } else {
1853                 if (old_format_only(s) && !silent) {
1854                         reiserfs_info(s, "using 3.5.x disk format\n");
1855                 }
1856
1857                 if ((errval = reiserfs_lookup_privroot(s)) ||
1858                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1859                         dput(s->s_root);
1860                         s->s_root = NULL;
1861                         goto error;
1862                 }
1863         }
1864         // mark hash in super block: it could be unset. overwrite should be ok
1865         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1866
1867         handle_attrs(s);
1868
1869         reiserfs_proc_info_init(s);
1870
1871         init_waitqueue_head(&(sbi->s_wait));
1872         spin_lock_init(&sbi->bitmap_lock);
1873
1874         return (0);
1875
1876 error:
1877         if (jinit_done) {       /* kill the commit thread, free journal ram */
1878                 journal_release_error(NULL, s);
1879         }
1880
1881         reiserfs_free_bitmap_cache(s);
1882         if (SB_BUFFER_WITH_SB(s))
1883                 brelse(SB_BUFFER_WITH_SB(s));
1884 #ifdef CONFIG_QUOTA
1885         {
1886                 int j;
1887                 for (j = 0; j < MAXQUOTAS; j++)
1888                         kfree(qf_names[j]);
1889         }
1890 #endif
1891         kfree(sbi);
1892
1893         s->s_fs_info = NULL;
1894         return errval;
1895 }
1896
1897 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1898 {
1899         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1900
1901         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1902         buf->f_bfree = sb_free_blocks(rs);
1903         buf->f_bavail = buf->f_bfree;
1904         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1905         buf->f_bsize = dentry->d_sb->s_blocksize;
1906         /* changed to accommodate gcc folks. */
1907         buf->f_type = REISERFS_SUPER_MAGIC;
1908         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1909         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1910                                 sizeof(rs->s_uuid)/2);
1911
1912         return 0;
1913 }
1914
1915 #ifdef CONFIG_QUOTA
1916 static int reiserfs_write_dquot(struct dquot *dquot)
1917 {
1918         struct reiserfs_transaction_handle th;
1919         int ret, err;
1920
1921         reiserfs_write_lock(dquot->dq_sb);
1922         ret =
1923             journal_begin(&th, dquot->dq_sb,
1924                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1925         if (ret)
1926                 goto out;
1927         ret = dquot_commit(dquot);
1928         err =
1929             journal_end(&th, dquot->dq_sb,
1930                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1931         if (!ret && err)
1932                 ret = err;
1933       out:
1934         reiserfs_write_unlock(dquot->dq_sb);
1935         return ret;
1936 }
1937
1938 static int reiserfs_acquire_dquot(struct dquot *dquot)
1939 {
1940         struct reiserfs_transaction_handle th;
1941         int ret, err;
1942
1943         reiserfs_write_lock(dquot->dq_sb);
1944         ret =
1945             journal_begin(&th, dquot->dq_sb,
1946                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1947         if (ret)
1948                 goto out;
1949         ret = dquot_acquire(dquot);
1950         err =
1951             journal_end(&th, dquot->dq_sb,
1952                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1953         if (!ret && err)
1954                 ret = err;
1955       out:
1956         reiserfs_write_unlock(dquot->dq_sb);
1957         return ret;
1958 }
1959
1960 static int reiserfs_release_dquot(struct dquot *dquot)
1961 {
1962         struct reiserfs_transaction_handle th;
1963         int ret, err;
1964
1965         reiserfs_write_lock(dquot->dq_sb);
1966         ret =
1967             journal_begin(&th, dquot->dq_sb,
1968                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1969         if (ret) {
1970                 /* Release dquot anyway to avoid endless cycle in dqput() */
1971                 dquot_release(dquot);
1972                 goto out;
1973         }
1974         ret = dquot_release(dquot);
1975         err =
1976             journal_end(&th, dquot->dq_sb,
1977                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1978         if (!ret && err)
1979                 ret = err;
1980       out:
1981         reiserfs_write_unlock(dquot->dq_sb);
1982         return ret;
1983 }
1984
1985 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1986 {
1987         /* Are we journaling quotas? */
1988         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1989             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1990                 dquot_mark_dquot_dirty(dquot);
1991                 return reiserfs_write_dquot(dquot);
1992         } else
1993                 return dquot_mark_dquot_dirty(dquot);
1994 }
1995
1996 static int reiserfs_write_info(struct super_block *sb, int type)
1997 {
1998         struct reiserfs_transaction_handle th;
1999         int ret, err;
2000
2001         /* Data block + inode block */
2002         reiserfs_write_lock(sb);
2003         ret = journal_begin(&th, sb, 2);
2004         if (ret)
2005                 goto out;
2006         ret = dquot_commit_info(sb, type);
2007         err = journal_end(&th, sb, 2);
2008         if (!ret && err)
2009                 ret = err;
2010       out:
2011         reiserfs_write_unlock(sb);
2012         return ret;
2013 }
2014
2015 /*
2016  * Turn on quotas during mount time - we need to find the quota file and such...
2017  */
2018 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2019 {
2020         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2021                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2022 }
2023
2024 /*
2025  * Standard function to be called on quota_on
2026  */
2027 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2028                              char *name, int remount)
2029 {
2030         int err;
2031         struct path path;
2032         struct inode *inode;
2033         struct reiserfs_transaction_handle th;
2034
2035         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2036                 return -EINVAL;
2037         /* No more checks needed? Path and format_id are bogus anyway... */
2038         if (remount)
2039                 return vfs_quota_on(sb, type, format_id, name, 1);
2040         err = kern_path(name, LOOKUP_FOLLOW, &path);
2041         if (err)
2042                 return err;
2043         /* Quotafile not on the same filesystem? */
2044         if (path.mnt->mnt_sb != sb) {
2045                 err = -EXDEV;
2046                 goto out;
2047         }
2048         inode = path.dentry->d_inode;
2049         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2050         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2051                 err = reiserfs_unpack(inode, NULL);
2052                 if (err) {
2053                         reiserfs_warning(sb, "super-6520",
2054                                 "Unpacking tail of quota file failed"
2055                                 " (%d). Cannot turn on quotas.", err);
2056                         err = -EINVAL;
2057                         goto out;
2058                 }
2059                 mark_inode_dirty(inode);
2060         }
2061         /* Journaling quota? */
2062         if (REISERFS_SB(sb)->s_qf_names[type]) {
2063                 /* Quotafile not of fs root? */
2064                 if (path.dentry->d_parent != sb->s_root)
2065                         reiserfs_warning(sb, "super-6521",
2066                                  "Quota file not on filesystem root. "
2067                                  "Journalled quota will not work.");
2068         }
2069
2070         /*
2071          * When we journal data on quota file, we have to flush journal to see
2072          * all updates to the file when we bypass pagecache...
2073          */
2074         if (reiserfs_file_data_log(inode)) {
2075                 /* Just start temporary transaction and finish it */
2076                 err = journal_begin(&th, sb, 1);
2077                 if (err)
2078                         goto out;
2079                 err = journal_end_sync(&th, sb, 1);
2080                 if (err)
2081                         goto out;
2082         }
2083         err = vfs_quota_on_path(sb, type, format_id, &path);
2084 out:
2085         path_put(&path);
2086         return err;
2087 }
2088
2089 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2090  * acquiring the locks... As quota files are never truncated and quota code
2091  * itself serializes the operations (and noone else should touch the files)
2092  * we don't have to be afraid of races */
2093 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2094                                    size_t len, loff_t off)
2095 {
2096         struct inode *inode = sb_dqopt(sb)->files[type];
2097         unsigned long blk = off >> sb->s_blocksize_bits;
2098         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2099         size_t toread;
2100         struct buffer_head tmp_bh, *bh;
2101         loff_t i_size = i_size_read(inode);
2102
2103         if (off > i_size)
2104                 return 0;
2105         if (off + len > i_size)
2106                 len = i_size - off;
2107         toread = len;
2108         while (toread > 0) {
2109                 tocopy =
2110                     sb->s_blocksize - offset <
2111                     toread ? sb->s_blocksize - offset : toread;
2112                 tmp_bh.b_state = 0;
2113                 /* Quota files are without tails so we can safely use this function */
2114                 reiserfs_write_lock(sb);
2115                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2116                 reiserfs_write_unlock(sb);
2117                 if (err)
2118                         return err;
2119                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2120                         memset(data, 0, tocopy);
2121                 else {
2122                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2123                         if (!bh)
2124                                 return -EIO;
2125                         memcpy(data, bh->b_data + offset, tocopy);
2126                         brelse(bh);
2127                 }
2128                 offset = 0;
2129                 toread -= tocopy;
2130                 data += tocopy;
2131                 blk++;
2132         }
2133         return len;
2134 }
2135
2136 /* Write to quotafile (we know the transaction is already started and has
2137  * enough credits) */
2138 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2139                                     const char *data, size_t len, loff_t off)
2140 {
2141         struct inode *inode = sb_dqopt(sb)->files[type];
2142         unsigned long blk = off >> sb->s_blocksize_bits;
2143         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2144         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2145         size_t towrite = len;
2146         struct buffer_head tmp_bh, *bh;
2147
2148         if (!current->journal_info) {
2149                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2150                         " cancelled because transaction is not started.\n",
2151                         (unsigned long long)off, (unsigned long long)len);
2152                 return -EIO;
2153         }
2154         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2155         while (towrite > 0) {
2156                 tocopy = sb->s_blocksize - offset < towrite ?
2157                     sb->s_blocksize - offset : towrite;
2158                 tmp_bh.b_state = 0;
2159                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2160                 if (err)
2161                         goto out;
2162                 if (offset || tocopy != sb->s_blocksize)
2163                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2164                 else
2165                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2166                 if (!bh) {
2167                         err = -EIO;
2168                         goto out;
2169                 }
2170                 lock_buffer(bh);
2171                 memcpy(bh->b_data + offset, data, tocopy);
2172                 flush_dcache_page(bh->b_page);
2173                 set_buffer_uptodate(bh);
2174                 unlock_buffer(bh);
2175                 reiserfs_prepare_for_journal(sb, bh, 1);
2176                 journal_mark_dirty(current->journal_info, sb, bh);
2177                 if (!journal_quota)
2178                         reiserfs_add_ordered_list(inode, bh);
2179                 brelse(bh);
2180                 offset = 0;
2181                 towrite -= tocopy;
2182                 data += tocopy;
2183                 blk++;
2184         }
2185 out:
2186         if (len == towrite) {
2187                 mutex_unlock(&inode->i_mutex);
2188                 return err;
2189         }
2190         if (inode->i_size < off + len - towrite)
2191                 i_size_write(inode, off + len - towrite);
2192         inode->i_version++;
2193         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2194         mark_inode_dirty(inode);
2195         mutex_unlock(&inode->i_mutex);
2196         return len - towrite;
2197 }
2198
2199 #endif
2200
2201 static int get_super_block(struct file_system_type *fs_type,
2202                            int flags, const char *dev_name,
2203                            void *data, struct vfsmount *mnt)
2204 {
2205         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2206                            mnt);
2207 }
2208
2209 static int __init init_reiserfs_fs(void)
2210 {
2211         int ret;
2212
2213         if ((ret = init_inodecache())) {
2214                 return ret;
2215         }
2216
2217         reiserfs_proc_info_global_init();
2218         reiserfs_proc_register_global("version",
2219                                       reiserfs_global_version_in_proc);
2220
2221         ret = register_filesystem(&reiserfs_fs_type);
2222
2223         if (ret == 0) {
2224                 return 0;
2225         }
2226
2227         reiserfs_proc_unregister_global("version");
2228         reiserfs_proc_info_global_done();
2229         destroy_inodecache();
2230
2231         return ret;
2232 }
2233
2234 static void __exit exit_reiserfs_fs(void)
2235 {
2236         reiserfs_proc_unregister_global("version");
2237         reiserfs_proc_info_global_done();
2238         unregister_filesystem(&reiserfs_fs_type);
2239         destroy_inodecache();
2240 }
2241
2242 struct file_system_type reiserfs_fs_type = {
2243         .owner = THIS_MODULE,
2244         .name = "reiserfs",
2245         .get_sb = get_super_block,
2246         .kill_sb = reiserfs_kill_sb,
2247         .fs_flags = FS_REQUIRES_DEV,
2248 };
2249
2250 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2251 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2252 MODULE_LICENSE("GPL");
2253
2254 module_init(init_reiserfs_fs);
2255 module_exit(exit_reiserfs_fs);