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 #ifdef CONFIG_REISERFS_FS_XATTR
 452                 if (REISERFS_SB(s)->xattr_root) {
 453                         d_invalidate(REISERFS_SB(s)->xattr_root);
 454                         dput(REISERFS_SB(s)->xattr_root);
 455                         REISERFS_SB(s)->xattr_root = NULL;
 456                 }
 457 #endif
 458                 if (REISERFS_SB(s)->priv_root) {
 459                         d_invalidate(REISERFS_SB(s)->priv_root);
 460                         dput(REISERFS_SB(s)->priv_root);
 461                         REISERFS_SB(s)->priv_root = NULL;
 462                 }
 463         }
 464
 465         kill_block_super(s);
 466 }
 467
 468 static void reiserfs_put_super(struct super_block *s)
 469 {
 470         struct reiserfs_transaction_handle th;
 471         th.t_trans_id = 0;
 472
 473         /* change file system state to current state if it was mounted with read-write permissions */
 474         if (!(s->s_flags & MS_RDONLY)) {
 475                 if (!journal_begin(&th, s, 10)) {
 476                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 477                                                      1);
 478                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 479                                             REISERFS_SB(s)->s_mount_state);
 480                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 481                 }
 482         }
 483
 484         /* note, journal_release checks for readonly mount, and can decide not
 485          ** to do a journal_end
 486          */
 487         journal_release(&th, s);
 488
 489         reiserfs_free_bitmap_cache(s);
 490
 491         brelse(SB_BUFFER_WITH_SB(s));
 492
 493         print_statistics(s);
 494
 495         if (REISERFS_SB(s)->reserved_blocks != 0) {
 496                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 497                                  REISERFS_SB(s)->reserved_blocks);
 498         }
 499
 500         reiserfs_proc_info_done(s);
 501
 502         kfree(s->s_fs_info);
 503         s->s_fs_info = NULL;
 504
 505         return;
 506 }
 507
 508 static struct kmem_cache *reiserfs_inode_cachep;
 509
 510 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 511 {
 512         struct reiserfs_inode_info *ei;
 513         ei = (struct reiserfs_inode_info *)
 514             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 515         if (!ei)
 516                 return NULL;
 517         return &ei->vfs_inode;
 518 }
 519
 520 static void reiserfs_destroy_inode(struct inode *inode)
 521 {
 522         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 523 }
 524
 525 static void init_once(void *foo)
 526 {
 527         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 528
 529         INIT_LIST_HEAD(&ei->i_prealloc_list);
 530         inode_init_once(&ei->vfs_inode);
 531 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 532         ei->i_acl_access = NULL;
 533         ei->i_acl_default = NULL;
 534 #endif
 535 }
 536
 537 static int init_inodecache(void)
 538 {
 539         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 540                                                   sizeof(struct
 541                                                          reiserfs_inode_info),
 542                                                   0, (SLAB_RECLAIM_ACCOUNT|
 543                                                         SLAB_MEM_SPREAD),
 544                                                   init_once);
 545         if (reiserfs_inode_cachep == NULL)
 546                 return -ENOMEM;
 547         return 0;
 548 }
 549
 550 static void destroy_inodecache(void)
 551 {
 552         kmem_cache_destroy(reiserfs_inode_cachep);
 553 }
 554
 555 /* we don't mark inodes dirty, we just log them */
 556 static void reiserfs_dirty_inode(struct inode *inode)
 557 {
 558         struct reiserfs_transaction_handle th;
 559
 560         int err = 0;
 561         if (inode->i_sb->s_flags & MS_RDONLY) {
 562                 reiserfs_warning(inode->i_sb, "clm-6006",
 563                                  "writing inode %lu on readonly FS",
 564                                  inode->i_ino);
 565                 return;
 566         }
 567         reiserfs_write_lock(inode->i_sb);
 568
 569         /* this is really only used for atime updates, so they don't have
 570          ** to be included in O_SYNC or fsync
 571          */
 572         err = journal_begin(&th, inode->i_sb, 1);
 573         if (err) {
 574                 reiserfs_write_unlock(inode->i_sb);
 575                 return;
 576         }
 577         reiserfs_update_sd(&th, inode);
 578         journal_end(&th, inode->i_sb, 1);
 579         reiserfs_write_unlock(inode->i_sb);
 580 }
 581
 582 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 583 static void reiserfs_clear_inode(struct inode *inode)
 584 {
 585         struct posix_acl *acl;
 586
 587         acl = REISERFS_I(inode)->i_acl_access;
 588         if (acl && !IS_ERR(acl))
 589                 posix_acl_release(acl);
 590         REISERFS_I(inode)->i_acl_access = NULL;
 591
 592         acl = REISERFS_I(inode)->i_acl_default;
 593         if (acl && !IS_ERR(acl))
 594                 posix_acl_release(acl);
 595         REISERFS_I(inode)->i_acl_default = NULL;
 596 }
 597 #else
 598 #define reiserfs_clear_inode NULL
 599 #endif
 600
 601 #ifdef CONFIG_QUOTA
 602 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 603                                     size_t, loff_t);
 604 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 605                                    loff_t);
 606 #endif
 607
 608 static const struct super_operations reiserfs_sops = {
 609         .alloc_inode = reiserfs_alloc_inode,
 610         .destroy_inode = reiserfs_destroy_inode,
 611         .write_inode = reiserfs_write_inode,
 612         .dirty_inode = reiserfs_dirty_inode,
 613         .delete_inode = reiserfs_delete_inode,
 614         .clear_inode = reiserfs_clear_inode,
 615         .put_super = reiserfs_put_super,
 616         .write_super = reiserfs_write_super,
 617         .sync_fs = reiserfs_sync_fs,
 618         .freeze_fs = reiserfs_freeze,
 619         .unfreeze_fs = reiserfs_unfreeze,
 620         .statfs = reiserfs_statfs,
 621         .remount_fs = reiserfs_remount,
 622         .show_options = generic_show_options,
 623 #ifdef CONFIG_QUOTA
 624         .quota_read = reiserfs_quota_read,
 625         .quota_write = reiserfs_quota_write,
 626 #endif
 627 };
 628
 629 #ifdef CONFIG_QUOTA
 630 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 631
 632 static int reiserfs_write_dquot(struct dquot *);
 633 static int reiserfs_acquire_dquot(struct dquot *);
 634 static int reiserfs_release_dquot(struct dquot *);
 635 static int reiserfs_mark_dquot_dirty(struct dquot *);
 636 static int reiserfs_write_info(struct super_block *, int);
 637 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
 638
 639 static struct dquot_operations reiserfs_quota_operations = {
 640         .initialize = dquot_initialize,
 641         .drop = dquot_drop,
 642         .alloc_space = dquot_alloc_space,
 643         .alloc_inode = dquot_alloc_inode,
 644         .free_space = dquot_free_space,
 645         .free_inode = dquot_free_inode,
 646         .transfer = dquot_transfer,
 647         .write_dquot = reiserfs_write_dquot,
 648         .acquire_dquot = reiserfs_acquire_dquot,
 649         .release_dquot = reiserfs_release_dquot,
 650         .mark_dirty = reiserfs_mark_dquot_dirty,
 651         .write_info = reiserfs_write_info,
 652         .alloc_dquot    = dquot_alloc,
 653         .destroy_dquot  = dquot_destroy,
 654 };
 655
 656 static struct quotactl_ops reiserfs_qctl_operations = {
 657         .quota_on = reiserfs_quota_on,
 658         .quota_off = vfs_quota_off,
 659         .quota_sync = vfs_quota_sync,
 660         .get_info = vfs_get_dqinfo,
 661         .set_info = vfs_set_dqinfo,
 662         .get_dqblk = vfs_get_dqblk,
 663         .set_dqblk = vfs_set_dqblk,
 664 };
 665 #endif
 666
 667 static const struct export_operations reiserfs_export_ops = {
 668         .encode_fh = reiserfs_encode_fh,
 669         .fh_to_dentry = reiserfs_fh_to_dentry,
 670         .fh_to_parent = reiserfs_fh_to_parent,
 671         .get_parent = reiserfs_get_parent,
 672 };
 673
 674 /* this struct is used in reiserfs_getopt () for containing the value for those
 675    mount options that have values rather than being toggles. */
 676 typedef struct {
 677         char *value;
 678         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 679                                    value is found, 0 is no bits are to be changed. */
 680         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 681                                    value is found, 0 is no bits are to be changed. This is
 682                                    applied BEFORE setmask */
 683 } arg_desc_t;
 684
 685 /* Set this bit in arg_required to allow empty arguments */
 686 #define REISERFS_OPT_ALLOWEMPTY 31
 687
 688 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 689    mount options */
 690 typedef struct {
 691         char *option_name;
 692         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 693         const arg_desc_t *values;       /* list of values accepted by an option */
 694         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 695                                    value is found, 0 is no bits are to be changed. */
 696         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 697                                    value is found, 0 is no bits are to be changed. This is
 698                                    applied BEFORE setmask */
 699 } opt_desc_t;
 700
 701 /* possible values for -o data= */
 702 static const arg_desc_t logging_mode[] = {
 703         {"ordered", 1 << REISERFS_DATA_ORDERED,
 704          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 705         {"journal", 1 << REISERFS_DATA_LOG,
 706          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 707         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 708          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 709         {.value = NULL}
 710 };
 711
 712 /* possible values for -o barrier= */
 713 static const arg_desc_t barrier_mode[] = {
 714         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 715         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 716         {.value = NULL}
 717 };
 718
 719 /* possible values for "-o block-allocator=" and bits which are to be set in
 720    s_mount_opt of reiserfs specific part of in-core super block */
 721 static const arg_desc_t balloc[] = {
 722         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 723         {"border", 0, 1 << REISERFS_NO_BORDER},
 724         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 725         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 726         {"test4", 1 << REISERFS_TEST4, 0},
 727         {"notest4", 0, 1 << REISERFS_TEST4},
 728         {NULL, 0, 0}
 729 };
 730
 731 static const arg_desc_t tails[] = {
 732         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 733         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 734         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 735         {NULL, 0, 0}
 736 };
 737
 738 static const arg_desc_t error_actions[] = {
 739         {"panic", 1 << REISERFS_ERROR_PANIC,
 740          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 741         {"ro-remount", 1 << REISERFS_ERROR_RO,
 742          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 743 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 744         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 745          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 746 #endif
 747         {NULL, 0, 0},
 748 };
 749
 750 /* proceed only one option from a list *cur - string containing of mount options
 751    opts - array of options which are accepted
 752    opt_arg - if option is found and requires an argument and if it is specifed
 753    in the input - pointer to the argument is stored here
 754    bit_flags - if option requires to set a certain bit - it is set here
 755    return -1 if unknown option is found, opt->arg_required otherwise */
 756 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 757                            char **opt_arg, unsigned long *bit_flags)
 758 {
 759         char *p;
 760         /* foo=bar,
 761            ^   ^  ^
 762            |   |  +-- option_end
 763            |   +-- arg_start
 764            +-- option_start
 765          */
 766         const opt_desc_t *opt;
 767         const arg_desc_t *arg;
 768
 769         p = *cur;
 770
 771         /* assume argument cannot contain commas */
 772         *cur = strchr(p, ',');
 773         if (*cur) {
 774                 *(*cur) = '\0';
 775                 (*cur)++;
 776         }
 777
 778         if (!strncmp(p, "alloc=", 6)) {
 779                 /* Ugly special case, probably we should redo options parser so that
 780                    it can understand several arguments for some options, also so that
 781                    it can fill several bitfields with option values. */
 782                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 783                         return -1;
 784                 } else {
 785                         return 0;
 786                 }
 787         }
 788
 789         /* for every option in the list */
 790         for (opt = opts; opt->option_name; opt++) {
 791                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 792                         if (bit_flags) {
 793                                 if (opt->clrmask ==
 794                                     (1 << REISERFS_UNSUPPORTED_OPT))
 795                                         reiserfs_warning(s, "super-6500",
 796                                                          "%s not supported.\n",
 797                                                          p);
 798                                 else
 799                                         *bit_flags &= ~opt->clrmask;
 800                                 if (opt->setmask ==
 801                                     (1 << REISERFS_UNSUPPORTED_OPT))
 802                                         reiserfs_warning(s, "super-6501",
 803                                                          "%s not supported.\n",
 804                                                          p);
 805                                 else
 806                                         *bit_flags |= opt->setmask;
 807                         }
 808                         break;
 809                 }
 810         }
 811         if (!opt->option_name) {
 812                 reiserfs_warning(s, "super-6502",
 813                                  "unknown mount option \"%s\"", p);
 814                 return -1;
 815         }
 816
 817         p += strlen(opt->option_name);
 818         switch (*p) {
 819         case '=':
 820                 if (!opt->arg_required) {
 821                         reiserfs_warning(s, "super-6503",
 822                                          "the option \"%s\" does not "
 823                                          "require an argument\n",
 824                                          opt->option_name);
 825                         return -1;
 826                 }
 827                 break;
 828
 829         case 0:
 830                 if (opt->arg_required) {
 831                         reiserfs_warning(s, "super-6504",
 832                                          "the option \"%s\" requires an "
 833                                          "argument\n", opt->option_name);
 834                         return -1;
 835                 }
 836                 break;
 837         default:
 838                 reiserfs_warning(s, "super-6505",
 839                                  "head of option \"%s\" is only correct\n",
 840                                  opt->option_name);
 841                 return -1;
 842         }
 843
 844         /* move to the argument, or to next option if argument is not required */
 845         p++;
 846
 847         if (opt->arg_required
 848             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 849             && !strlen(p)) {
 850                 /* this catches "option=," if not allowed */
 851                 reiserfs_warning(s, "super-6506",
 852                                  "empty argument for \"%s\"\n",
 853                                  opt->option_name);
 854                 return -1;
 855         }
 856
 857         if (!opt->values) {
 858                 /* *=NULLopt_arg contains pointer to argument */
 859                 *opt_arg = p;
 860                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 861         }
 862
 863         /* values possible for this option are listed in opt->values */
 864         for (arg = opt->values; arg->value; arg++) {
 865                 if (!strcmp(p, arg->value)) {
 866                         if (bit_flags) {
 867                                 *bit_flags &= ~arg->clrmask;
 868                                 *bit_flags |= arg->setmask;
 869                         }
 870                         return opt->arg_required;
 871                 }
 872         }
 873
 874         reiserfs_warning(s, "super-6506",
 875                          "bad value \"%s\" for option \"%s\"\n", p,
 876                          opt->option_name);
 877         return -1;
 878 }
 879
 880 /* returns 0 if something is wrong in option string, 1 - otherwise */
 881 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 882                                   unsigned long *mount_options,
 883                                   /* after the parsing phase, contains the
 884                                      collection of bitflags defining what
 885                                      mount options were selected. */
 886                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 887                                   char **jdev_name,
 888                                   unsigned int *commit_max_age,
 889                                   char **qf_names,
 890                                   unsigned int *qfmt)
 891 {
 892         int c;
 893         char *arg = NULL;
 894         char *pos;
 895         opt_desc_t opts[] = {
 896                 /* Compatibility stuff, so that -o notail for old setups still work */
 897                 {"tails",.arg_required = 't',.values = tails},
 898                 {"notail",.clrmask =
 899                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 900                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 901                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 902                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 903 #ifdef CONFIG_REISERFS_FS_XATTR
 904                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 905                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 906 #else
 907                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 908                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 909 #endif
 910 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 911                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 912                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 913 #else
 914                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 915                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 916 #endif
 917                 {.option_name = "nolog"},
 918                 {"replayonly",.setmask = 1 << REPLAYONLY},
 919                 {"block-allocator",.arg_required = 'a',.values = balloc},
 920                 {"data",.arg_required = 'd',.values = logging_mode},
 921                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 922                 {"resize",.arg_required = 'r',.values = NULL},
 923                 {"jdev",.arg_required = 'j',.values = NULL},
 924                 {"nolargeio",.arg_required = 'w',.values = NULL},
 925                 {"commit",.arg_required = 'c',.values = NULL},
 926                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 927                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 928                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 929                 {"errors",.arg_required = 'e',.values = error_actions},
 930                 {"usrjquota",.arg_required =
 931                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 932                 {"grpjquota",.arg_required =
 933                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 934                 {"jqfmt",.arg_required = 'f',.values = NULL},
 935                 {.option_name = NULL}
 936         };
 937
 938         *blocks = 0;
 939         if (!options || !*options)
 940                 /* use default configuration: create tails, journaling on, no
 941                    conversion to newest format */
 942                 return 1;
 943
 944         for (pos = options; pos;) {
 945                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 946                 if (c == -1)
 947                         /* wrong option is given */
 948                         return 0;
 949
 950                 if (c == 'r') {
 951                         char *p;
 952
 953                         p = NULL;
 954                         /* "resize=NNN" or "resize=auto" */
 955
 956                         if (!strcmp(arg, "auto")) {
 957                                 /* From JFS code, to auto-get the size. */
 958                                 *blocks =
 959                                     s->s_bdev->bd_inode->i_size >> s->
 960                                     s_blocksize_bits;
 961                         } else {
 962                                 *blocks = simple_strtoul(arg, &p, 0);
 963                                 if (*p != '\0') {
 964                                         /* NNN does not look like a number */
 965                                         reiserfs_warning(s, "super-6507",
 966                                                          "bad value %s for "
 967                                                          "-oresize\n", arg);
 968                                         return 0;
 969                                 }
 970                         }
 971                 }
 972
 973                 if (c == 'c') {
 974                         char *p = NULL;
 975                         unsigned long val = simple_strtoul(arg, &p, 0);
 976                         /* commit=NNN (time in seconds) */
 977                         if (*p != '\0' || val >= (unsigned int)-1) {
 978                                 reiserfs_warning(s, "super-6508",
 979                                                  "bad value %s for -ocommit\n",
 980                                                  arg);
 981                                 return 0;
 982                         }
 983                         *commit_max_age = (unsigned int)val;
 984                 }
 985
 986                 if (c == 'w') {
 987                         reiserfs_warning(s, "super-6509", "nolargeio option "
 988                                          "is no longer supported");
 989                         return 0;
 990                 }
 991
 992                 if (c == 'j') {
 993                         if (arg && *arg && jdev_name) {
 994                                 if (*jdev_name) {       //Hm, already assigned?
 995                                         reiserfs_warning(s, "super-6510",
 996                                                          "journal device was "
 997                                                          "already specified to "
 998                                                          "be %s", *jdev_name);
 999                                         return 0;
1000                                 }
1001                                 *jdev_name = arg;
1002                         }
1003                 }
1004 #ifdef CONFIG_QUOTA
1005                 if (c == 'u' || c == 'g') {
1006                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1007
1008                         if (sb_any_quota_loaded(s) &&
1009                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1010                                 reiserfs_warning(s, "super-6511",
1011                                                  "cannot change journaled "
1012                                                  "quota options when quota "
1013                                                  "turned on.");
1014                                 return 0;
1015                         }
1016                         if (*arg) {     /* Some filename specified? */
1017                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1018                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1019                                               arg)) {
1020                                         reiserfs_warning(s, "super-6512",
1021                                                          "%s quota file "
1022                                                          "already specified.",
1023                                                          QTYPE2NAME(qtype));
1024                                         return 0;
1025                                 }
1026                                 if (strchr(arg, '/')) {
1027                                         reiserfs_warning(s, "super-6513",
1028                                                          "quotafile must be "
1029                                                          "on filesystem root.");
1030                                         return 0;
1031                                 }
1032                                 qf_names[qtype] =
1033                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1034                                 if (!qf_names[qtype]) {
1035                                         reiserfs_warning(s, "reiserfs-2502",
1036                                                          "not enough memory "
1037                                                          "for storing "
1038                                                          "quotafile name.");
1039                                         return 0;
1040                                 }
1041                                 strcpy(qf_names[qtype], arg);
1042                                 *mount_options |= 1 << REISERFS_QUOTA;
1043                         } else {
1044                                 if (qf_names[qtype] !=
1045                                     REISERFS_SB(s)->s_qf_names[qtype])
1046                                         kfree(qf_names[qtype]);
1047                                 qf_names[qtype] = NULL;
1048                         }
1049                 }
1050                 if (c == 'f') {
1051                         if (!strcmp(arg, "vfsold"))
1052                                 *qfmt = QFMT_VFS_OLD;
1053                         else if (!strcmp(arg, "vfsv0"))
1054                                 *qfmt = QFMT_VFS_V0;
1055                         else {
1056                                 reiserfs_warning(s, "super-6514",
1057                                                  "unknown quota format "
1058                                                  "specified.");
1059                                 return 0;
1060                         }
1061                         if (sb_any_quota_loaded(s) &&
1062                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1063                                 reiserfs_warning(s, "super-6515",
1064                                                  "cannot change journaled "
1065                                                  "quota options when quota "
1066                                                  "turned on.");
1067                                 return 0;
1068                         }
1069                 }
1070 #else
1071                 if (c == 'u' || c == 'g' || c == 'f') {
1072                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1073                                          "quota options not supported.");
1074                         return 0;
1075                 }
1076 #endif
1077         }
1078
1079 #ifdef CONFIG_QUOTA
1080         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1081             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1082                 reiserfs_warning(s, "super-6515",
1083                                  "journaled quota format not specified.");
1084                 return 0;
1085         }
1086         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1087         if (!(*mount_options & (1 << REISERFS_QUOTA))
1088             && sb_any_quota_loaded(s)) {
1089                 reiserfs_warning(s, "super-6516", "quota options must "
1090                                  "be present when quota is turned on.");
1091                 return 0;
1092         }
1093 #endif
1094
1095         return 1;
1096 }
1097
1098 static void switch_data_mode(struct super_block *s, unsigned long mode)
1099 {
1100         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1101                                          (1 << REISERFS_DATA_ORDERED) |
1102                                          (1 << REISERFS_DATA_WRITEBACK));
1103         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1104 }
1105
1106 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1107 {
1108         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1109                 if (!reiserfs_data_log(s)) {
1110                         switch_data_mode(s, REISERFS_DATA_LOG);
1111                         reiserfs_info(s, "switching to journaled data mode\n");
1112                 }
1113         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1114                 if (!reiserfs_data_ordered(s)) {
1115                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1116                         reiserfs_info(s, "switching to ordered data mode\n");
1117                 }
1118         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1119                 if (!reiserfs_data_writeback(s)) {
1120                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1121                         reiserfs_info(s, "switching to writeback data mode\n");
1122                 }
1123         }
1124 }
1125
1126 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1127 {
1128         int flush = (1 << REISERFS_BARRIER_FLUSH);
1129         int none = (1 << REISERFS_BARRIER_NONE);
1130         int all_barrier = flush | none;
1131
1132         if (bits & all_barrier) {
1133                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1134                 if (bits & flush) {
1135                         REISERFS_SB(s)->s_mount_opt |= flush;
1136                         printk("reiserfs: enabling write barrier flush mode\n");
1137                 } else if (bits & none) {
1138                         REISERFS_SB(s)->s_mount_opt |= none;
1139                         printk("reiserfs: write barriers turned off\n");
1140                 }
1141         }
1142 }
1143
1144 static void handle_attrs(struct super_block *s)
1145 {
1146         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1147
1148         if (reiserfs_attrs(s)) {
1149                 if (old_format_only(s)) {
1150                         reiserfs_warning(s, "super-6517", "cannot support "
1151                                          "attributes on 3.5.x disk format");
1152                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1153                         return;
1154                 }
1155                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1156                         reiserfs_warning(s, "super-6518", "cannot support "
1157                                          "attributes until flag is set in "
1158                                          "super-block");
1159                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1160                 }
1161         }
1162 }
1163
1164 #ifdef CONFIG_QUOTA
1165 static void handle_quota_files(struct super_block *s, char **qf_names,
1166                                unsigned int *qfmt)
1167 {
1168         int i;
1169
1170         for (i = 0; i < MAXQUOTAS; i++) {
1171                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1172                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1173                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1174         }
1175         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1176 }
1177 #endif
1178
1179 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1180 {
1181         struct reiserfs_super_block *rs;
1182         struct reiserfs_transaction_handle th;
1183         unsigned long blocks;
1184         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1185         unsigned long safe_mask = 0;
1186         unsigned int commit_max_age = (unsigned int)-1;
1187         struct reiserfs_journal *journal = SB_JOURNAL(s);
1188         char *new_opts = kstrdup(arg, GFP_KERNEL);
1189         int err;
1190         char *qf_names[MAXQUOTAS];
1191         unsigned int qfmt = 0;
1192 #ifdef CONFIG_QUOTA
1193         int i;
1194
1195         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1196 #endif
1197
1198         rs = SB_DISK_SUPER_BLOCK(s);
1199
1200         if (!reiserfs_parse_options
1201             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1202             qf_names, &qfmt)) {
1203 #ifdef CONFIG_QUOTA
1204                 for (i = 0; i < MAXQUOTAS; i++)
1205                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1206                                 kfree(qf_names[i]);
1207 #endif
1208                 err = -EINVAL;
1209                 goto out_err;
1210         }
1211 #ifdef CONFIG_QUOTA
1212         handle_quota_files(s, qf_names, &qfmt);
1213 #endif
1214
1215         handle_attrs(s);
1216
1217         /* Add options that are safe here */
1218         safe_mask |= 1 << REISERFS_SMALLTAIL;
1219         safe_mask |= 1 << REISERFS_LARGETAIL;
1220         safe_mask |= 1 << REISERFS_NO_BORDER;
1221         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1222         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1223         safe_mask |= 1 << REISERFS_TEST4;
1224         safe_mask |= 1 << REISERFS_ATTRS;
1225         safe_mask |= 1 << REISERFS_XATTRS_USER;
1226         safe_mask |= 1 << REISERFS_POSIXACL;
1227         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1228         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1229         safe_mask |= 1 << REISERFS_ERROR_RO;
1230         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1231         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1232         safe_mask |= 1 << REISERFS_QUOTA;
1233
1234         /* Update the bitmask, taking care to keep
1235          * the bits we're not allowed to change here */
1236         REISERFS_SB(s)->s_mount_opt =
1237             (REISERFS_SB(s)->
1238              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1239
1240         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1241                 journal->j_max_commit_age = commit_max_age;
1242                 journal->j_max_trans_age = commit_max_age;
1243         } else if (commit_max_age == 0) {
1244                 /* 0 means restore defaults. */
1245                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1246                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1247         }
1248
1249         if (blocks) {
1250                 err = reiserfs_resize(s, blocks);
1251                 if (err != 0)
1252                         goto out_err;
1253         }
1254
1255         if (*mount_flags & MS_RDONLY) {
1256                 reiserfs_xattr_init(s, *mount_flags);
1257                 /* remount read-only */
1258                 if (s->s_flags & MS_RDONLY)
1259                         /* it is read-only already */
1260                         goto out_ok;
1261                 /* try to remount file system with read-only permissions */
1262                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1263                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1264                         goto out_ok;
1265                 }
1266
1267                 err = journal_begin(&th, s, 10);
1268                 if (err)
1269                         goto out_err;
1270
1271                 /* Mounting a rw partition read-only. */
1272                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1273                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1274                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1275         } else {
1276                 /* remount read-write */
1277                 if (!(s->s_flags & MS_RDONLY)) {
1278                         reiserfs_xattr_init(s, *mount_flags);
1279                         goto out_ok;    /* We are read-write already */
1280                 }
1281
1282                 if (reiserfs_is_journal_aborted(journal)) {
1283                         err = journal->j_errno;
1284                         goto out_err;
1285                 }
1286
1287                 handle_data_mode(s, mount_options);
1288                 handle_barrier_mode(s, mount_options);
1289                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1290                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1291                 err = journal_begin(&th, s, 10);
1292                 if (err)
1293                         goto out_err;
1294
1295                 /* Mount a partition which is read-only, read-write */
1296                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1297                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1298                 s->s_flags &= ~MS_RDONLY;
1299                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1300                 if (!old_format_only(s))
1301                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1302                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1303                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1304                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1305         }
1306         /* this will force a full flush of all journal lists */
1307         SB_JOURNAL(s)->j_must_wait = 1;
1308         err = journal_end(&th, s, 10);
1309         if (err)
1310                 goto out_err;
1311         s->s_dirt = 0;
1312
1313         if (!(*mount_flags & MS_RDONLY)) {
1314                 finish_unfinished(s);
1315                 reiserfs_xattr_init(s, *mount_flags);
1316         }
1317
1318 out_ok:
1319         kfree(s->s_options);
1320         s->s_options = new_opts;
1321         return 0;
1322
1323 out_err:
1324         kfree(new_opts);
1325         return err;
1326 }
1327
1328 static int read_super_block(struct super_block *s, int offset)
1329 {
1330         struct buffer_head *bh;
1331         struct reiserfs_super_block *rs;
1332         int fs_blocksize;
1333
1334         bh = sb_bread(s, offset / s->s_blocksize);
1335         if (!bh) {
1336                 reiserfs_warning(s, "sh-2006",
1337                                  "bread failed (dev %s, block %lu, size %lu)",
1338                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1339                                  s->s_blocksize);
1340                 return 1;
1341         }
1342
1343         rs = (struct reiserfs_super_block *)bh->b_data;
1344         if (!is_any_reiserfs_magic_string(rs)) {
1345                 brelse(bh);
1346                 return 1;
1347         }
1348         //
1349         // ok, reiserfs signature (old or new) found in at the given offset
1350         //
1351         fs_blocksize = sb_blocksize(rs);
1352         brelse(bh);
1353         sb_set_blocksize(s, fs_blocksize);
1354
1355         bh = sb_bread(s, offset / s->s_blocksize);
1356         if (!bh) {
1357                 reiserfs_warning(s, "sh-2007",
1358                                  "bread failed (dev %s, block %lu, size %lu)",
1359                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1360                                  s->s_blocksize);
1361                 return 1;
1362         }
1363
1364         rs = (struct reiserfs_super_block *)bh->b_data;
1365         if (sb_blocksize(rs) != s->s_blocksize) {
1366                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1367                                  "filesystem on (dev %s, block %Lu, size %lu)",
1368                                  reiserfs_bdevname(s),
1369                                  (unsigned long long)bh->b_blocknr,
1370                                  s->s_blocksize);
1371                 brelse(bh);
1372                 return 1;
1373         }
1374
1375         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1376                 brelse(bh);
1377                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1378                                  "--rebuild-tree run detected. Please run\n"
1379                                  "reiserfsck --rebuild-tree and wait for a "
1380                                  "completion. If that fails\n"
1381                                  "get newer reiserfsprogs package");
1382                 return 1;
1383         }
1384
1385         SB_BUFFER_WITH_SB(s) = bh;
1386         SB_DISK_SUPER_BLOCK(s) = rs;
1387
1388         if (is_reiserfs_jr(rs)) {
1389                 /* magic is of non-standard journal filesystem, look at s_version to
1390                    find which format is in use */
1391                 if (sb_version(rs) == REISERFS_VERSION_2)
1392                         reiserfs_info(s, "found reiserfs format \"3.6\""
1393                                       " with non-standard journal\n");
1394                 else if (sb_version(rs) == REISERFS_VERSION_1)
1395                         reiserfs_info(s, "found reiserfs format \"3.5\""
1396                                       " with non-standard journal\n");
1397                 else {
1398                         reiserfs_warning(s, "sh-2012", "found unknown "
1399                                          "format \"%u\" of reiserfs with "
1400                                          "non-standard magic", sb_version(rs));
1401                         return 1;
1402                 }
1403         } else
1404                 /* s_version of standard format may contain incorrect information,
1405                    so we just look at the magic string */
1406                 reiserfs_info(s,
1407                               "found reiserfs format \"%s\" with standard journal\n",
1408                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1409
1410         s->s_op = &reiserfs_sops;
1411         s->s_export_op = &reiserfs_export_ops;
1412 #ifdef CONFIG_QUOTA
1413         s->s_qcop = &reiserfs_qctl_operations;
1414         s->dq_op = &reiserfs_quota_operations;
1415 #endif
1416
1417         /* new format is limited by the 32 bit wide i_blocks field, want to
1418          ** be one full block below that.
1419          */
1420         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1421         return 0;
1422 }
1423
1424 /* after journal replay, reread all bitmap and super blocks */
1425 static int reread_meta_blocks(struct super_block *s)
1426 {
1427         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1428         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1429         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1430                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1431                 return 1;
1432         }
1433
1434         return 0;
1435 }
1436
1437 /////////////////////////////////////////////////////
1438 // hash detection stuff
1439
1440 // if root directory is empty - we set default - Yura's - hash and
1441 // warn about it
1442 // FIXME: we look for only one name in a directory. If tea and yura
1443 // bith have the same value - we ask user to send report to the
1444 // mailing list
1445 static __u32 find_hash_out(struct super_block *s)
1446 {
1447         int retval;
1448         struct inode *inode;
1449         struct cpu_key key;
1450         INITIALIZE_PATH(path);
1451         struct reiserfs_dir_entry de;
1452         __u32 hash = DEFAULT_HASH;
1453
1454         inode = s->s_root->d_inode;
1455
1456         do {                    // Some serious "goto"-hater was there ;)
1457                 u32 teahash, r5hash, yurahash;
1458
1459                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1460                 retval = search_by_entry_key(s, &key, &path, &de);
1461                 if (retval == IO_ERROR) {
1462                         pathrelse(&path);
1463                         return UNSET_HASH;
1464                 }
1465                 if (retval == NAME_NOT_FOUND)
1466                         de.de_entry_num--;
1467                 set_de_name_and_namelen(&de);
1468                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1469                         /* allow override in this case */
1470                         if (reiserfs_rupasov_hash(s)) {
1471                                 hash = YURA_HASH;
1472                         }
1473                         reiserfs_info(s, "FS seems to be empty, autodetect "
1474                                          "is using the default hash\n");
1475                         break;
1476                 }
1477                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1478                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1479                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1480                 if (((teahash == r5hash)
1481                      &&
1482                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1483                       == r5hash)) || ((teahash == yurahash)
1484                                       && (yurahash ==
1485                                           GET_HASH_VALUE(deh_offset
1486                                                          (&
1487                                                           (de.
1488                                                            de_deh[de.
1489                                                                   de_entry_num])))))
1490                     || ((r5hash == yurahash)
1491                         && (yurahash ==
1492                             GET_HASH_VALUE(deh_offset
1493                                            (&(de.de_deh[de.de_entry_num])))))) {
1494                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1495                                          "automatically detect hash function. "
1496                                          "Please mount with -o "
1497                                          "hash={tea,rupasov,r5}");
1498                         hash = UNSET_HASH;
1499                         break;
1500                 }
1501                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1502                     yurahash)
1503                         hash = YURA_HASH;
1504                 else if (GET_HASH_VALUE
1505                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1506                         hash = TEA_HASH;
1507                 else if (GET_HASH_VALUE
1508                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1509                         hash = R5_HASH;
1510                 else {
1511                         reiserfs_warning(s, "reiserfs-2506",
1512                                          "Unrecognised hash function");
1513                         hash = UNSET_HASH;
1514                 }
1515         } while (0);
1516
1517         pathrelse(&path);
1518         return hash;
1519 }
1520
1521 // finds out which hash names are sorted with
1522 static int what_hash(struct super_block *s)
1523 {
1524         __u32 code;
1525
1526         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1527
1528         /* reiserfs_hash_detect() == true if any of the hash mount options
1529          ** were used.  We must check them to make sure the user isn't
1530          ** using a bad hash value
1531          */
1532         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1533                 code = find_hash_out(s);
1534
1535         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1536                 /* detection has found the hash, and we must check against the
1537                  ** mount options
1538                  */
1539                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1540                         reiserfs_warning(s, "reiserfs-2507",
1541                                          "Error, %s hash detected, "
1542                                          "unable to force rupasov hash",
1543                                          reiserfs_hashname(code));
1544                         code = UNSET_HASH;
1545                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1546                         reiserfs_warning(s, "reiserfs-2508",
1547                                          "Error, %s hash detected, "
1548                                          "unable to force tea hash",
1549                                          reiserfs_hashname(code));
1550                         code = UNSET_HASH;
1551                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1552                         reiserfs_warning(s, "reiserfs-2509",
1553                                          "Error, %s hash detected, "
1554                                          "unable to force r5 hash",
1555                                          reiserfs_hashname(code));
1556                         code = UNSET_HASH;
1557                 }
1558         } else {
1559                 /* find_hash_out was not called or could not determine the hash */
1560                 if (reiserfs_rupasov_hash(s)) {
1561                         code = YURA_HASH;
1562                 } else if (reiserfs_tea_hash(s)) {
1563                         code = TEA_HASH;
1564                 } else if (reiserfs_r5_hash(s)) {
1565                         code = R5_HASH;
1566                 }
1567         }
1568
1569         /* if we are mounted RW, and we have a new valid hash code, update
1570          ** the super
1571          */
1572         if (code != UNSET_HASH &&
1573             !(s->s_flags & MS_RDONLY) &&
1574             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1575                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1576         }
1577         return code;
1578 }
1579
1580 // return pointer to appropriate function
1581 static hashf_t hash_function(struct super_block *s)
1582 {
1583         switch (what_hash(s)) {
1584         case TEA_HASH:
1585                 reiserfs_info(s, "Using tea hash to sort names\n");
1586                 return keyed_hash;
1587         case YURA_HASH:
1588                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1589                 return yura_hash;
1590         case R5_HASH:
1591                 reiserfs_info(s, "Using r5 hash to sort names\n");
1592                 return r5_hash;
1593         }
1594         return NULL;
1595 }
1596
1597 // this is used to set up correct value for old partitions
1598 static int function2code(hashf_t func)
1599 {
1600         if (func == keyed_hash)
1601                 return TEA_HASH;
1602         if (func == yura_hash)
1603                 return YURA_HASH;
1604         if (func == r5_hash)
1605                 return R5_HASH;
1606
1607         BUG();                  // should never happen
1608
1609         return 0;
1610 }
1611
1612 #define SWARN(silent, s, id, ...)                       \
1613         if (!(silent))                          \
1614                 reiserfs_warning(s, id, __VA_ARGS__)
1615
1616 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1617 {
1618         struct inode *root_inode;
1619         struct reiserfs_transaction_handle th;
1620         int old_format = 0;
1621         unsigned long blocks;
1622         unsigned int commit_max_age = 0;
1623         int jinit_done = 0;
1624         struct reiserfs_iget_args args;
1625         struct reiserfs_super_block *rs;
1626         char *jdev_name;
1627         struct reiserfs_sb_info *sbi;
1628         int errval = -EINVAL;
1629         char *qf_names[MAXQUOTAS] = {};
1630         unsigned int qfmt = 0;
1631
1632         save_mount_options(s, data);
1633
1634         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1635         if (!sbi) {
1636                 errval = -ENOMEM;
1637                 goto error;
1638         }
1639         s->s_fs_info = sbi;
1640         /* Set default values for options: non-aggressive tails, RO on errors */
1641         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1642         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1643         /* no preallocation minimum, be smart in
1644            reiserfs_file_write instead */
1645         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1646         /* Preallocate by 16 blocks (17-1) at once */
1647         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1648         /* setup default block allocator options */
1649         reiserfs_init_alloc_options(s);
1650
1651         jdev_name = NULL;
1652         if (reiserfs_parse_options
1653             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1654              &commit_max_age, qf_names, &qfmt) == 0) {
1655                 goto error;
1656         }
1657 #ifdef CONFIG_QUOTA
1658         handle_quota_files(s, qf_names, &qfmt);
1659 #endif
1660
1661         if (blocks) {
1662                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1663                 goto error;
1664         }
1665
1666         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1667         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1668                 old_format = 1;
1669         /* try new format (64-th 1k block), which can contain reiserfs super block */
1670         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1671                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1672                       reiserfs_bdevname(s));
1673                 goto error;
1674         }
1675
1676         rs = SB_DISK_SUPER_BLOCK(s);
1677         /* Let's do basic sanity check to verify that underlying device is not
1678            smaller than the filesystem. If the check fails then abort and scream,
1679            because bad stuff will happen otherwise. */
1680         if (s->s_bdev && s->s_bdev->bd_inode
1681             && i_size_read(s->s_bdev->bd_inode) <
1682             sb_block_count(rs) * sb_blocksize(rs)) {
1683                 SWARN(silent, s, "", "Filesystem cannot be "
1684                       "mounted because it is bigger than the device");
1685                 SWARN(silent, s, "", "You may need to run fsck "
1686                       "or increase size of your LVM partition");
1687                 SWARN(silent, s, "", "Or may be you forgot to "
1688                       "reboot after fdisk when it told you to");
1689                 goto error;
1690         }
1691
1692         sbi->s_mount_state = SB_REISERFS_STATE(s);
1693         sbi->s_mount_state = REISERFS_VALID_FS;
1694
1695         if ((errval = reiserfs_init_bitmap_cache(s))) {
1696                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1697                 goto error;
1698         }
1699         errval = -EINVAL;
1700 #ifdef CONFIG_REISERFS_CHECK
1701         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1702         SWARN(silent, s, "", "- it is slow mode for debugging.");
1703 #endif
1704
1705         /* make data=ordered the default */
1706         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1707             !reiserfs_data_writeback(s)) {
1708                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1709         }
1710
1711         if (reiserfs_data_log(s)) {
1712                 reiserfs_info(s, "using journaled data mode\n");
1713         } else if (reiserfs_data_ordered(s)) {
1714                 reiserfs_info(s, "using ordered data mode\n");
1715         } else {
1716                 reiserfs_info(s, "using writeback data mode\n");
1717         }
1718         if (reiserfs_barrier_flush(s)) {
1719                 printk("reiserfs: using flush barriers\n");
1720         }
1721         // set_device_ro(s->s_dev, 1) ;
1722         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1723                 SWARN(silent, s, "sh-2022",
1724                       "unable to initialize journal space");
1725                 goto error;
1726         } else {
1727                 jinit_done = 1; /* once this is set, journal_release must be called
1728                                  ** if we error out of the mount
1729                                  */
1730         }
1731         if (reread_meta_blocks(s)) {
1732                 SWARN(silent, s, "jmacd-9",
1733                       "unable to reread meta blocks after journal init");
1734                 goto error;
1735         }
1736
1737         if (replay_only(s))
1738                 goto error;
1739
1740         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1741                 SWARN(silent, s, "clm-7000",
1742                       "Detected readonly device, marking FS readonly");
1743                 s->s_flags |= MS_RDONLY;
1744         }
1745         args.objectid = REISERFS_ROOT_OBJECTID;
1746         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1747         root_inode =
1748             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1749                          reiserfs_init_locked_inode, (void *)(&args));
1750         if (!root_inode) {
1751                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1752                 goto error;
1753         }
1754
1755         if (root_inode->i_state & I_NEW) {
1756                 reiserfs_read_locked_inode(root_inode, &args);
1757                 unlock_new_inode(root_inode);
1758         }
1759
1760         s->s_root = d_alloc_root(root_inode);
1761         if (!s->s_root) {
1762                 iput(root_inode);
1763                 goto error;
1764         }
1765         // define and initialize hash function
1766         sbi->s_hash_function = hash_function(s);
1767         if (sbi->s_hash_function == NULL) {
1768                 dput(s->s_root);
1769                 s->s_root = NULL;
1770                 goto error;
1771         }
1772
1773         if (is_reiserfs_3_5(rs)
1774             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1775                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1776         else if (old_format)
1777                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1778         else
1779                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1780
1781         if (!(s->s_flags & MS_RDONLY)) {
1782
1783                 errval = journal_begin(&th, s, 1);
1784                 if (errval) {
1785                         dput(s->s_root);
1786                         s->s_root = NULL;
1787                         goto error;
1788                 }
1789                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1790
1791                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1792                 set_sb_fs_state(rs, 0);
1793
1794                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1795                  * case, but older revisions can't. This will cause the
1796                  * file system to fail mount on those older implementations,
1797                  * avoiding corruption. -jeffm */
1798                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1799                     sb_bmap_nr(rs) != 0) {
1800                         reiserfs_warning(s, "super-2030", "This file system "
1801                                         "claims to use %u bitmap blocks in "
1802                                         "its super block, but requires %u. "
1803                                         "Clearing to zero.", sb_bmap_nr(rs),
1804                                         reiserfs_bmap_count(s));
1805
1806                         set_sb_bmap_nr(rs, 0);
1807                 }
1808
1809                 if (old_format_only(s)) {
1810                         /* filesystem of format 3.5 either with standard or non-standard
1811                            journal */
1812                         if (convert_reiserfs(s)) {
1813                                 /* and -o conv is given */
1814                                 if (!silent)
1815                                         reiserfs_info(s,
1816                                                       "converting 3.5 filesystem to the 3.6 format");
1817
1818                                 if (is_reiserfs_3_5(rs))
1819                                         /* put magic string of 3.6 format. 2.2 will not be able to
1820                                            mount this filesystem anymore */
1821                                         memcpy(rs->s_v1.s_magic,
1822                                                reiserfs_3_6_magic_string,
1823                                                sizeof
1824                                                (reiserfs_3_6_magic_string));
1825
1826                                 set_sb_version(rs, REISERFS_VERSION_2);
1827                                 reiserfs_convert_objectid_map_v1(s);
1828                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1829                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1830                         } else if (!silent) {
1831                                 reiserfs_info(s, "using 3.5.x disk format\n");
1832                         }
1833                 } else
1834                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1835
1836
1837                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1838                 errval = journal_end(&th, s, 1);
1839                 if (errval) {
1840                         dput(s->s_root);
1841                         s->s_root = NULL;
1842                         goto error;
1843                 }
1844
1845                 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1846                         dput(s->s_root);
1847                         s->s_root = NULL;
1848                         goto error;
1849                 }
1850
1851                 /* look for files which were to be removed in previous session */
1852                 finish_unfinished(s);
1853         } else {
1854                 if (old_format_only(s) && !silent) {
1855                         reiserfs_info(s, "using 3.5.x disk format\n");
1856                 }
1857
1858                 if ((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);