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

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/time.h>
  17 #include <asm/uaccess.h>
  18 #include <linux/reiserfs_fs.h>
  19 #include <linux/reiserfs_acl.h>
  20 #include <linux/reiserfs_xattr.h>
  21 #include <linux/init.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/buffer_head.h>
  24 #include <linux/exportfs.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/vfs.h>
  27 #include <linux/mnt_namespace.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.h>
  31
  32 struct file_system_type reiserfs_fs_type;
  33
  34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  37
  38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  39 {
  40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  41                         strlen(reiserfs_3_5_magic_string));
  42 }
  43
  44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  45 {
  46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  47                         strlen(reiserfs_3_6_magic_string));
  48 }
  49
  50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  51 {
  52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  53                         strlen(reiserfs_jr_magic_string));
  54 }
  55
  56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  57 {
  58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  59                 is_reiserfs_jr(rs));
  60 }
  61
  62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  64
  65 static int reiserfs_sync_fs(struct super_block *s, int wait)
  66 {
  67         if (!(s->s_flags & MS_RDONLY)) {
  68                 struct reiserfs_transaction_handle th;
  69                 reiserfs_write_lock(s);
  70                 if (!journal_begin(&th, s, 1))
  71                         if (!journal_end_sync(&th, s, 1))
  72                                 reiserfs_flush_old_commits(s);
  73                 s->s_dirt = 0;  /* Even if it's not true.
  74                                  * We'll loop forever in sync_supers otherwise */
  75                 reiserfs_write_unlock(s);
  76         } else {
  77                 s->s_dirt = 0;
  78         }
  79         return 0;
  80 }
  81
  82 static void reiserfs_write_super(struct super_block *s)
  83 {
  84         reiserfs_sync_fs(s, 1);
  85 }
  86
  87 static int reiserfs_freeze(struct super_block *s)
  88 {
  89         struct reiserfs_transaction_handle th;
  90         reiserfs_write_lock(s);
  91         if (!(s->s_flags & MS_RDONLY)) {
  92                 int err = journal_begin(&th, s, 1);
  93                 if (err) {
  94                         reiserfs_block_writes(&th);
  95                 } else {
  96                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  97                                                      1);
  98                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  99                         reiserfs_block_writes(&th);
 100                         journal_end_sync(&th, s, 1);
 101                 }
 102         }
 103         s->s_dirt = 0;
 104         reiserfs_write_unlock(s);
 105         return 0;
 106 }
 107
 108 static int reiserfs_unfreeze(struct super_block *s)
 109 {
 110         reiserfs_allow_writes(s);
 111         return 0;
 112 }
 113
 114 extern const struct in_core_key MAX_IN_CORE_KEY;
 115
 116 /* this is used to delete "save link" when there are no items of a
 117    file it points to. It can either happen if unlink is completed but
 118    "save unlink" removal, or if file has both unlink and truncate
 119    pending and as unlink completes first (because key of "save link"
 120    protecting unlink is bigger that a key lf "save link" which
 121    protects truncate), so there left no items to make truncate
 122    completion on */
 123 static int remove_save_link_only(struct super_block *s,
 124                                  struct reiserfs_key *key, int oid_free)
 125 {
 126         struct reiserfs_transaction_handle th;
 127         int err;
 128
 129         /* we are going to do one balancing */
 130         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 131         if (err)
 132                 return err;
 133
 134         reiserfs_delete_solid_item(&th, NULL, key);
 135         if (oid_free)
 136                 /* removals are protected by direct items */
 137                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 138
 139         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 140 }
 141
 142 #ifdef CONFIG_QUOTA
 143 static int reiserfs_quota_on_mount(struct super_block *, int);
 144 #endif
 145
 146 /* look for uncompleted unlinks and truncates and complete them */
 147 static int finish_unfinished(struct super_block *s)
 148 {
 149         INITIALIZE_PATH(path);
 150         struct cpu_key max_cpu_key, obj_key;
 151         struct reiserfs_key save_link_key, last_inode_key;
 152         int retval = 0;
 153         struct item_head *ih;
 154         struct buffer_head *bh;
 155         int item_pos;
 156         char *item;
 157         int done;
 158         struct inode *inode;
 159         int truncate;
 160 #ifdef CONFIG_QUOTA
 161         int i;
 162         int ms_active_set;
 163 #endif
 164
 165         /* compose key to look for "save" links */
 166         max_cpu_key.version = KEY_FORMAT_3_5;
 167         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 168         max_cpu_key.on_disk_key.k_objectid = ~0U;
 169         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 170         max_cpu_key.key_length = 3;
 171
 172         memset(&last_inode_key, 0, sizeof(last_inode_key));
 173
 174 #ifdef CONFIG_QUOTA
 175         /* Needed for iput() to work correctly and not trash data */
 176         if (s->s_flags & MS_ACTIVE) {
 177                 ms_active_set = 0;
 178         } else {
 179                 ms_active_set = 1;
 180                 s->s_flags |= MS_ACTIVE;
 181         }
 182         /* Turn on quotas so that they are updated correctly */
 183         for (i = 0; i < MAXQUOTAS; i++) {
 184                 if (REISERFS_SB(s)->s_qf_names[i]) {
 185                         int ret = reiserfs_quota_on_mount(s, i);
 186                         if (ret < 0)
 187                                 reiserfs_warning(s, "reiserfs-2500",
 188                                                  "cannot turn on journaled "
 189                                                  "quota: error %d", ret);
 190                 }
 191         }
 192 #endif
 193
 194         done = 0;
 195         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 196         while (!retval) {
 197                 retval = search_item(s, &max_cpu_key, &path);
 198                 if (retval != ITEM_NOT_FOUND) {
 199                         reiserfs_error(s, "vs-2140",
 200                                        "search_by_key returned %d", retval);
 201                         break;
 202                 }
 203
 204                 bh = get_last_bh(&path);
 205                 item_pos = get_item_pos(&path);
 206                 if (item_pos != B_NR_ITEMS(bh)) {
 207                         reiserfs_warning(s, "vs-2060",
 208                                          "wrong position found");
 209                         break;
 210                 }
 211                 item_pos--;
 212                 ih = B_N_PITEM_HEAD(bh, item_pos);
 213
 214                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 215                         /* there are no "save" links anymore */
 216                         break;
 217
 218                 save_link_key = ih->ih_key;
 219                 if (is_indirect_le_ih(ih))
 220                         truncate = 1;
 221                 else
 222                         truncate = 0;
 223
 224                 /* reiserfs_iget needs k_dirid and k_objectid only */
 225                 item = B_I_PITEM(bh, ih);
 226                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 227                 obj_key.on_disk_key.k_objectid =
 228                     le32_to_cpu(ih->ih_key.k_objectid);
 229                 obj_key.on_disk_key.k_offset = 0;
 230                 obj_key.on_disk_key.k_type = 0;
 231
 232                 pathrelse(&path);
 233
 234                 inode = reiserfs_iget(s, &obj_key);
 235                 if (!inode) {
 236                         /* the unlink almost completed, it just did not manage to remove
 237                            "save" link and release objectid */
 238                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 239                                          &obj_key);
 240                         retval = remove_save_link_only(s, &save_link_key, 1);
 241                         continue;
 242                 }
 243
 244                 if (!truncate && inode->i_nlink) {
 245                         /* file is not unlinked */
 246                         reiserfs_warning(s, "vs-2185",
 247                                          "file %K is not unlinked",
 248                                          &obj_key);
 249                         retval = remove_save_link_only(s, &save_link_key, 0);
 250                         continue;
 251                 }
 252                 vfs_dq_init(inode);
 253
 254                 if (truncate && S_ISDIR(inode->i_mode)) {
 255                         /* We got a truncate request for a dir which is impossible.
 256                            The only imaginable way is to execute unfinished truncate request
 257                            then boot into old kernel, remove the file and create dir with
 258                            the same key. */
 259                         reiserfs_warning(s, "green-2101",
 260                                          "impossible truncate on a "
 261                                          "directory %k. Please report",
 262                                          INODE_PKEY(inode));
 263                         retval = remove_save_link_only(s, &save_link_key, 0);
 264                         truncate = 0;
 265                         iput(inode);
 266                         continue;
 267                 }
 268
 269                 if (truncate) {
 270                         REISERFS_I(inode)->i_flags |=
 271                             i_link_saved_truncate_mask;
 272                         /* not completed truncate found. New size was committed together
 273                            with "save" link */
 274                         reiserfs_info(s, "Truncating %k to %Ld ..",
 275                                       INODE_PKEY(inode), inode->i_size);
 276                         reiserfs_truncate_file(inode,
 277                                                0
 278                                                /*don't update modification time */
 279                                                );
 280                         retval = remove_save_link(inode, truncate);
 281                 } else {
 282                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 283                         /* not completed unlink (rmdir) found */
 284                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 285                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 286                                         sizeof(last_inode_key))){
 287                                 last_inode_key = *INODE_PKEY(inode);
 288                                 /* removal gets completed in iput */
 289                                 retval = 0;
 290                         } else {
 291                                 reiserfs_warning(s, "super-2189", "Dead loop "
 292                                                  "in finish_unfinished "
 293                                                  "detected, just remove "
 294                                                  "save link\n");
 295                                 retval = remove_save_link_only(s,
 296                                                         &save_link_key, 0);
 297                         }
 298                 }
 299
 300                 iput(inode);
 301                 printk("done\n");
 302                 done++;
 303         }
 304         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 305
 306 #ifdef CONFIG_QUOTA
 307         /* Turn quotas off */
 308         for (i = 0; i < MAXQUOTAS; i++) {
 309                 if (sb_dqopt(s)->files[i])
 310                         vfs_quota_off(s, i, 0);
 311         }
 312         if (ms_active_set)
 313                 /* Restore the flag back */
 314                 s->s_flags &= ~MS_ACTIVE;
 315 #endif
 316         pathrelse(&path);
 317         if (done)
 318                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 319                               "Completed\n", done);
 320         return retval;
 321 }
 322
 323 /* to protect file being unlinked from getting lost we "safe" link files
 324    being unlinked. This link will be deleted in the same transaction with last
 325    item of file. mounting the filesystem we scan all these links and remove
 326    files which almost got lost */
 327 void add_save_link(struct reiserfs_transaction_handle *th,
 328                    struct inode *inode, int truncate)
 329 {
 330         INITIALIZE_PATH(path);
 331         int retval;
 332         struct cpu_key key;
 333         struct item_head ih;
 334         __le32 link;
 335
 336         BUG_ON(!th->t_trans_id);
 337
 338         /* file can only get one "save link" of each kind */
 339         RFALSE(truncate &&
 340                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 341                "saved link already exists for truncated inode %lx",
 342                (long)inode->i_ino);
 343         RFALSE(!truncate &&
 344                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 345                "saved link already exists for unlinked inode %lx",
 346                (long)inode->i_ino);
 347
 348         /* setup key of "save" link */
 349         key.version = KEY_FORMAT_3_5;
 350         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 351         key.on_disk_key.k_objectid = inode->i_ino;
 352         if (!truncate) {
 353                 /* unlink, rmdir, rename */
 354                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 355                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 356
 357                 /* item head of "safe" link */
 358                 make_le_item_head(&ih, &key, key.version,
 359                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 360                                   4 /*length */ , 0xffff /*free space */ );
 361         } else {
 362                 /* truncate */
 363                 if (S_ISDIR(inode->i_mode))
 364                         reiserfs_warning(inode->i_sb, "green-2102",
 365                                          "Adding a truncate savelink for "
 366                                          "a directory %k! Please report",
 367                                          INODE_PKEY(inode));
 368                 set_cpu_key_k_offset(&key, 1);
 369                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 370
 371                 /* item head of "safe" link */
 372                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 373                                   4 /*length */ , 0 /*free space */ );
 374         }
 375         key.key_length = 3;
 376
 377         /* look for its place in the tree */
 378         retval = search_item(inode->i_sb, &key, &path);
 379         if (retval != ITEM_NOT_FOUND) {
 380                 if (retval != -ENOSPC)
 381                         reiserfs_error(inode->i_sb, "vs-2100",
 382                                        "search_by_key (%K) returned %d", &key,
 383                                        retval);
 384                 pathrelse(&path);
 385                 return;
 386         }
 387
 388         /* body of "save" link */
 389         link = INODE_PKEY(inode)->k_dir_id;
 390
 391         /* put "save" link inot tree, don't charge quota to anyone */
 392         retval =
 393             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 394         if (retval) {
 395                 if (retval != -ENOSPC)
 396                         reiserfs_error(inode->i_sb, "vs-2120",
 397                                        "insert_item returned %d", retval);
 398         } else {
 399                 if (truncate)
 400                         REISERFS_I(inode)->i_flags |=
 401                             i_link_saved_truncate_mask;
 402                 else
 403                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 404         }
 405 }
 406
 407 /* this opens transaction unlike add_save_link */
 408 int remove_save_link(struct inode *inode, int truncate)
 409 {
 410         struct reiserfs_transaction_handle th;
 411         struct reiserfs_key key;
 412         int err;
 413
 414         /* we are going to do one balancing only */
 415         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 416         if (err)
 417                 return err;
 418
 419         /* setup key of "save" link */
 420         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 421         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 422         if (!truncate) {
 423                 /* unlink, rmdir, rename */
 424                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 425                                     1 + inode->i_sb->s_blocksize);
 426                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 427         } else {
 428                 /* truncate */
 429                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 430                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 431         }
 432
 433         if ((truncate &&
 434              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 435             (!truncate &&
 436              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 437                 /* don't take quota bytes from anywhere */
 438                 reiserfs_delete_solid_item(&th, NULL, &key);
 439         if (!truncate) {
 440                 reiserfs_release_objectid(&th, inode->i_ino);
 441                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 442         } else
 443                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 444
 445         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 446 }
 447
 448 static void reiserfs_kill_sb(struct super_block *s)
 449 {
 450         if (REISERFS_SB(s)) {
 451 #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         replace_mount_options(s, new_opts);
1320         return 0;
1321
1322 out_err:
1323         kfree(new_opts);
1324         return err;
1325 }
1326
1327 static int read_super_block(struct super_block *s, int offset)
1328 {
1329         struct buffer_head *bh;
1330         struct reiserfs_super_block *rs;
1331         int fs_blocksize;
1332
1333         bh = sb_bread(s, offset / s->s_blocksize);
1334         if (!bh) {
1335                 reiserfs_warning(s, "sh-2006",
1336                                  "bread failed (dev %s, block %lu, size %lu)",
1337                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1338                                  s->s_blocksize);
1339                 return 1;
1340         }
1341
1342         rs = (struct reiserfs_super_block *)bh->b_data;
1343         if (!is_any_reiserfs_magic_string(rs)) {
1344                 brelse(bh);
1345                 return 1;
1346         }
1347         //
1348         // ok, reiserfs signature (old or new) found in at the given offset
1349         //
1350         fs_blocksize = sb_blocksize(rs);
1351         brelse(bh);
1352         sb_set_blocksize(s, fs_blocksize);
1353
1354         bh = sb_bread(s, offset / s->s_blocksize);
1355         if (!bh) {
1356                 reiserfs_warning(s, "sh-2007",
1357                                  "bread failed (dev %s, block %lu, size %lu)",
1358                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1359                                  s->s_blocksize);
1360                 return 1;
1361         }
1362
1363         rs = (struct reiserfs_super_block *)bh->b_data;
1364         if (sb_blocksize(rs) != s->s_blocksize) {
1365                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1366                                  "filesystem on (dev %s, block %Lu, size %lu)",
1367                                  reiserfs_bdevname(s),
1368                                  (unsigned long long)bh->b_blocknr,
1369                                  s->s_blocksize);
1370                 brelse(bh);
1371                 return 1;
1372         }
1373
1374         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1375                 brelse(bh);
1376                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1377                                  "--rebuild-tree run detected. Please run\n"
1378                                  "reiserfsck --rebuild-tree and wait for a "
1379                                  "completion. If that fails\n"
1380                                  "get newer reiserfsprogs package");
1381                 return 1;
1382         }
1383
1384         SB_BUFFER_WITH_SB(s) = bh;
1385         SB_DISK_SUPER_BLOCK(s) = rs;
1386
1387         if (is_reiserfs_jr(rs)) {
1388                 /* magic is of non-standard journal filesystem, look at s_version to
1389                    find which format is in use */
1390                 if (sb_version(rs) == REISERFS_VERSION_2)
1391                         reiserfs_info(s, "found reiserfs format \"3.6\""
1392                                       " with non-standard journal\n");
1393                 else if (sb_version(rs) == REISERFS_VERSION_1)
1394                         reiserfs_info(s, "found reiserfs format \"3.5\""
1395                                       " with non-standard journal\n");
1396                 else {
1397                         reiserfs_warning(s, "sh-2012", "found unknown "
1398                                          "format \"%u\" of reiserfs with "
1399                                          "non-standard magic", sb_version(rs));
1400                         return 1;
1401                 }
1402         } else
1403                 /* s_version of standard format may contain incorrect information,
1404                    so we just look at the magic string */
1405                 reiserfs_info(s,
1406                               "found reiserfs format \"%s\" with standard journal\n",
1407                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1408
1409         s->s_op = &reiserfs_sops;
1410         s->s_export_op = &reiserfs_export_ops;
1411 #ifdef CONFIG_QUOTA
1412         s->s_qcop = &reiserfs_qctl_operations;
1413         s->dq_op = &reiserfs_quota_operations;
1414 #endif
1415
1416         /* new format is limited by the 32 bit wide i_blocks field, want to
1417          ** be one full block below that.
1418          */
1419         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1420         return 0;
1421 }
1422
1423 /* after journal replay, reread all bitmap and super blocks */
1424 static int reread_meta_blocks(struct super_block *s)
1425 {
1426         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1427         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1428         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1429                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1430                 return 1;
1431         }
1432
1433         return 0;
1434 }
1435
1436 /////////////////////////////////////////////////////
1437 // hash detection stuff
1438
1439 // if root directory is empty - we set default - Yura's - hash and
1440 // warn about it
1441 // FIXME: we look for only one name in a directory. If tea and yura
1442 // bith have the same value - we ask user to send report to the
1443 // mailing list
1444 static __u32 find_hash_out(struct super_block *s)
1445 {
1446         int retval;
1447         struct inode *inode;
1448         struct cpu_key key;
1449         INITIALIZE_PATH(path);
1450         struct reiserfs_dir_entry de;
1451         __u32 hash = DEFAULT_HASH;
1452
1453         inode = s->s_root->d_inode;
1454
1455         do {                    // Some serious "goto"-hater was there ;)
1456                 u32 teahash, r5hash, yurahash;
1457
1458                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1459                 retval = search_by_entry_key(s, &key, &path, &de);
1460                 if (retval == IO_ERROR) {
1461                         pathrelse(&path);
1462                         return UNSET_HASH;
1463                 }
1464                 if (retval == NAME_NOT_FOUND)
1465                         de.de_entry_num--;
1466                 set_de_name_and_namelen(&de);
1467                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1468                         /* allow override in this case */
1469                         if (reiserfs_rupasov_hash(s)) {
1470                                 hash = YURA_HASH;
1471                         }
1472                         reiserfs_info(s, "FS seems to be empty, autodetect "
1473                                          "is using the default hash\n");
1474                         break;
1475                 }
1476                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1477                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1478                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1479                 if (((teahash == r5hash)
1480                      &&
1481                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1482                       == r5hash)) || ((teahash == yurahash)
1483                                       && (yurahash ==
1484                                           GET_HASH_VALUE(deh_offset
1485                                                          (&
1486                                                           (de.
1487                                                            de_deh[de.
1488                                                                   de_entry_num])))))
1489                     || ((r5hash == yurahash)
1490                         && (yurahash ==
1491                             GET_HASH_VALUE(deh_offset
1492                                            (&(de.de_deh[de.de_entry_num])))))) {
1493                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1494                                          "automatically detect hash function. "
1495                                          "Please mount with -o "
1496                                          "hash={tea,rupasov,r5}");
1497                         hash = UNSET_HASH;
1498                         break;
1499                 }
1500                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1501                     yurahash)
1502                         hash = YURA_HASH;
1503                 else if (GET_HASH_VALUE
1504                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1505                         hash = TEA_HASH;
1506                 else if (GET_HASH_VALUE
1507                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1508                         hash = R5_HASH;
1509                 else {
1510                         reiserfs_warning(s, "reiserfs-2506",
1511                                          "Unrecognised hash function");
1512                         hash = UNSET_HASH;
1513                 }
1514         } while (0);
1515
1516         pathrelse(&path);
1517         return hash;
1518 }
1519
1520 // finds out which hash names are sorted with
1521 static int what_hash(struct super_block *s)
1522 {
1523         __u32 code;
1524
1525         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1526
1527         /* reiserfs_hash_detect() == true if any of the hash mount options
1528          ** were used.  We must check them to make sure the user isn't
1529          ** using a bad hash value
1530          */
1531         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1532                 code = find_hash_out(s);
1533
1534         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1535                 /* detection has found the hash, and we must check against the
1536                  ** mount options
1537                  */
1538                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1539                         reiserfs_warning(s, "reiserfs-2507",
1540                                          "Error, %s hash detected, "
1541                                          "unable to force rupasov hash",
1542                                          reiserfs_hashname(code));
1543                         code = UNSET_HASH;
1544                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1545                         reiserfs_warning(s, "reiserfs-2508",
1546                                          "Error, %s hash detected, "
1547                                          "unable to force tea hash",
1548                                          reiserfs_hashname(code));
1549                         code = UNSET_HASH;
1550                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1551                         reiserfs_warning(s, "reiserfs-2509",
1552                                          "Error, %s hash detected, "
1553                                          "unable to force r5 hash",
1554                                          reiserfs_hashname(code));
1555                         code = UNSET_HASH;
1556                 }
1557         } else {
1558                 /* find_hash_out was not called or could not determine the hash */
1559                 if (reiserfs_rupasov_hash(s)) {
1560                         code = YURA_HASH;
1561                 } else if (reiserfs_tea_hash(s)) {
1562                         code = TEA_HASH;
1563                 } else if (reiserfs_r5_hash(s)) {
1564                         code = R5_HASH;
1565                 }
1566         }
1567
1568         /* if we are mounted RW, and we have a new valid hash code, update
1569          ** the super
1570          */
1571         if (code != UNSET_HASH &&
1572             !(s->s_flags & MS_RDONLY) &&
1573             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1574                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1575         }
1576         return code;
1577 }
1578
1579 // return pointer to appropriate function
1580 static hashf_t hash_function(struct super_block *s)
1581 {
1582         switch (what_hash(s)) {
1583         case TEA_HASH:
1584                 reiserfs_info(s, "Using tea hash to sort names\n");
1585                 return keyed_hash;
1586         case YURA_HASH:
1587                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1588                 return yura_hash;
1589         case R5_HASH:
1590                 reiserfs_info(s, "Using r5 hash to sort names\n");
1591                 return r5_hash;
1592         }
1593         return NULL;
1594 }
1595
1596 // this is used to set up correct value for old partitions
1597 static int function2code(hashf_t func)
1598 {
1599         if (func == keyed_hash)
1600                 return TEA_HASH;
1601         if (func == yura_hash)
1602                 return YURA_HASH;
1603         if (func == r5_hash)
1604                 return R5_HASH;
1605
1606         BUG();                  // should never happen
1607
1608         return 0;
1609 }
1610
1611 #define SWARN(silent, s, id, ...)                       \
1612         if (!(silent))                          \
1613                 reiserfs_warning(s, id, __VA_ARGS__)
1614
1615 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1616 {
1617         struct inode *root_inode;
1618         struct reiserfs_transaction_handle th;
1619         int old_format = 0;
1620         unsigned long blocks;
1621         unsigned int commit_max_age = 0;
1622         int jinit_done = 0;
1623         struct reiserfs_iget_args args;
1624         struct reiserfs_super_block *rs;
1625         char *jdev_name;
1626         struct reiserfs_sb_info *sbi;
1627         int errval = -EINVAL;
1628         char *qf_names[MAXQUOTAS] = {};
1629         unsigned int qfmt = 0;
1630
1631         save_mount_options(s, data);
1632
1633         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1634         if (!sbi) {
1635                 errval = -ENOMEM;
1636                 goto error;
1637         }
1638         s->s_fs_info = sbi;
1639         /* Set default values for options: non-aggressive tails, RO on errors */
1640         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1641         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1642         /* no preallocation minimum, be smart in
1643            reiserfs_file_write instead */
1644         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1645         /* Preallocate by 16 blocks (17-1) at once */
1646         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1647         /* setup default block allocator options */
1648         reiserfs_init_alloc_options(s);
1649
1650         jdev_name = NULL;
1651         if (reiserfs_parse_options
1652             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1653              &commit_max_age, qf_names, &qfmt) == 0) {
1654                 goto error;
1655         }
1656 #ifdef CONFIG_QUOTA
1657         handle_quota_files(s, qf_names, &qfmt);
1658 #endif
1659
1660         if (blocks) {
1661                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1662                 goto error;
1663         }
1664
1665         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1666         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1667                 old_format = 1;
1668         /* try new format (64-th 1k block), which can contain reiserfs super block */
1669         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1670                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1671                       reiserfs_bdevname(s));
1672                 goto error;
1673         }
1674
1675         rs = SB_DISK_SUPER_BLOCK(s);
1676         /* Let's do basic sanity check to verify that underlying device is not
1677            smaller than the filesystem. If the check fails then abort and scream,
1678            because bad stuff will happen otherwise. */
1679         if (s->s_bdev && s->s_bdev->bd_inode
1680             && i_size_read(s->s_bdev->bd_inode) <
1681             sb_block_count(rs) * sb_blocksize(rs)) {
1682                 SWARN(silent, s, "", "Filesystem cannot be "
1683                       "mounted because it is bigger than the device");
1684                 SWARN(silent, s, "", "You may need to run fsck "
1685                       "or increase size of your LVM partition");
1686                 SWARN(silent, s, "", "Or may be you forgot to "
1687                       "reboot after fdisk when it told you to");
1688                 goto error;
1689         }
1690
1691         sbi->s_mount_state = SB_REISERFS_STATE(s);
1692         sbi->s_mount_state = REISERFS_VALID_FS;
1693
1694         if ((errval = reiserfs_init_bitmap_cache(s))) {
1695                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1696                 goto error;
1697         }
1698         errval = -EINVAL;
1699 #ifdef CONFIG_REISERFS_CHECK
1700         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1701         SWARN(silent, s, "", "- it is slow mode for debugging.");
1702 #endif
1703
1704         /* make data=ordered the default */
1705         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1706             !reiserfs_data_writeback(s)) {
1707                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1708         }
1709
1710         if (reiserfs_data_log(s)) {
1711                 reiserfs_info(s, "using journaled data mode\n");
1712         } else if (reiserfs_data_ordered(s)) {
1713                 reiserfs_info(s, "using ordered data mode\n");
1714         } else {
1715                 reiserfs_info(s, "using writeback data mode\n");
1716         }
1717         if (reiserfs_barrier_flush(s)) {
1718                 printk("reiserfs: using flush barriers\n");
1719         }
1720         // set_device_ro(s->s_dev, 1) ;
1721         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1722                 SWARN(silent, s, "sh-2022",
1723                       "unable to initialize journal space");
1724                 goto error;
1725         } else {
1726                 jinit_done = 1; /* once this is set, journal_release must be called
1727                                  ** if we error out of the mount
1728                                  */
1729         }
1730         if (reread_meta_blocks(s)) {
1731                 SWARN(silent, s, "jmacd-9",
1732                       "unable to reread meta blocks after journal init");
1733                 goto error;
1734         }
1735
1736         if (replay_only(s))
1737                 goto error;
1738
1739         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1740                 SWARN(silent, s, "clm-7000",
1741                       "Detected readonly device, marking FS readonly");
1742                 s->s_flags |= MS_RDONLY;
1743         }
1744         args.objectid = REISERFS_ROOT_OBJECTID;
1745         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1746         root_inode =
1747             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1748                          reiserfs_init_locked_inode, (void *)(&args));
1749         if (!root_inode) {
1750                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1751                 goto error;
1752         }
1753
1754         if (root_inode->i_state & I_NEW) {
1755                 reiserfs_read_locked_inode(root_inode, &args);
1756                 unlock_new_inode(root_inode);
1757         }
1758
1759         s->s_root = d_alloc_root(root_inode);
1760         if (!s->s_root) {
1761                 iput(root_inode);
1762                 goto error;
1763         }
1764         // define and initialize hash function
1765         sbi->s_hash_function = hash_function(s);
1766         if (sbi->s_hash_function == NULL) {
1767                 dput(s->s_root);
1768                 s->s_root = NULL;
1769                 goto error;
1770         }
1771
1772         if (is_reiserfs_3_5(rs)
1773             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1774                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1775         else if (old_format)
1776                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1777         else
1778                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1779
1780         if (!(s->s_flags & MS_RDONLY)) {
1781
1782                 errval = journal_begin(&th, s, 1);
1783                 if (errval) {
1784                         dput(s->s_root);
1785                         s->s_root = NULL;
1786                         goto error;
1787                 }
1788                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1789
1790                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1791                 set_sb_fs_state(rs, 0);
1792
1793                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1794                  * case, but older revisions can't. This will cause the
1795                  * file system to fail mount on those older implementations,
1796                  * avoiding corruption. -jeffm */
1797                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1798                     sb_bmap_nr(rs) != 0) {
1799                         reiserfs_warning(s, "super-2030", "This file system "
1800                                         "claims to use %u bitmap blocks in "
1801                                         "its super block, but requires %u. "
1802                                         "Clearing to zero.", sb_bmap_nr(rs),
1803                                         reiserfs_bmap_count(s));
1804
1805                         set_sb_bmap_nr(rs, 0);
1806                 }
1807
1808                 if (old_format_only(s)) {
1809                         /* filesystem of format 3.5 either with standard or non-standard
1810                            journal */
1811                         if (convert_reiserfs(s)) {
1812                                 /* and -o conv is given */
1813                                 if (!silent)
1814                                         reiserfs_info(s,
1815                                                       "converting 3.5 filesystem to the 3.6 format");
1816
1817                                 if (is_reiserfs_3_5(rs))
1818                                         /* put magic string of 3.6 format. 2.2 will not be able to
1819                                            mount this filesystem anymore */
1820                                         memcpy(rs->s_v1.s_magic,
1821                                                reiserfs_3_6_magic_string,
1822                                                sizeof
1823                                                (reiserfs_3_6_magic_string));
1824
1825                                 set_sb_version(rs, REISERFS_VERSION_2);
1826                                 reiserfs_convert_objectid_map_v1(s);
1827                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1828                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1829                         } else if (!silent) {
1830                                 reiserfs_info(s, "using 3.5.x disk format\n");
1831                         }
1832                 } else
1833                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1834
1835
1836                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1837                 errval = journal_end(&th, s, 1);
1838                 if (errval) {
1839                         dput(s->s_root);
1840                         s->s_root = NULL;
1841                         goto error;
1842                 }
1843
1844                 if ((errval = reiserfs_lookup_privroot(s)) ||
1845                     (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_lookup_privroot(s)) ||
1859                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1860                         dput(s->s_root);
1861                         s->s_root = NULL;
1862                         goto error;
1863                 }
1864         }
1865         // mark hash in super block: it could be unset. overwrite should be ok
1866         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1867
1868         handle_attrs(s);
1869
1870         reiserfs_proc_info_init(s);
1871
1872         init_waitqueue_head(&(sbi->s_wait));
1873         spin_lock_init(&sbi->bitmap_lock);
1874
1875         return (0);
1876
1877 error:
1878         if (jinit_done) {       /* kill the commit thread, free journal ram */
1879                 journal_release_error(NULL, s);
1880         }
1881
1882         reiserfs_free_bitmap_cache(s);
1883         if (SB_BUFFER_WITH_SB(s))
1884                 brelse(SB_BUFFER_WITH_SB(s));
1885 #ifdef CONFIG_QUOTA
1886         {
1887                 int j;
1888                 for (j = 0; j < MAXQUOTAS; j++)
1889                         kfree(qf_names[j]);
1890         }
1891 #endif
1892         kfree(sbi);
1893
1894         s->s_fs_info = NULL;
1895         return errval;
1896 }
1897
1898 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1899 {
1900         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1901
1902         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1903         buf->f_bfree = sb_free_blocks(rs);
1904         buf->f_bavail = buf->f_bfree;
1905         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1906         buf->f_bsize = dentry->d_sb->s_blocksize;
1907         /* changed to accommodate gcc folks. */
1908         buf->f_type = REISERFS_SUPER_MAGIC;
1909         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1910         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1911                                 sizeof(rs->s_uuid)/2);
1912
1913         return 0;
1914 }
1915
1916 #ifdef CONFIG_QUOTA
1917 static int reiserfs_write_dquot(struct dquot *dquot)
1918 {
1919         struct reiserfs_transaction_handle th;
1920         int ret, err;
1921
1922         reiserfs_write_lock(dquot->dq_sb);
1923         ret =
1924             journal_begin(&th, dquot->dq_sb,
1925                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1926         if (ret)
1927                 goto out;
1928         ret = dquot_commit(dquot);
1929         err =
1930             journal_end(&th, dquot->dq_sb,
1931                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1932         if (!ret && err)
1933                 ret = err;
1934       out:
1935         reiserfs_write_unlock(dquot->dq_sb);
1936         return ret;
1937 }
1938
1939 static int reiserfs_acquire_dquot(struct dquot *dquot)
1940 {
1941         struct reiserfs_transaction_handle th;
1942         int ret, err;
1943
1944         reiserfs_write_lock(dquot->dq_sb);
1945         ret =
1946             journal_begin(&th, dquot->dq_sb,
1947                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1948         if (ret)
1949                 goto out;
1950         ret = dquot_acquire(dquot);
1951         err =
1952             journal_end(&th, dquot->dq_sb,
1953                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1954         if (!ret && err)
1955                 ret = err;
1956       out:
1957         reiserfs_write_unlock(dquot->dq_sb);
1958         return ret;
1959 }
1960
1961 static int reiserfs_release_dquot(struct dquot *dquot)
1962 {
1963         struct reiserfs_transaction_handle th;
1964         int ret, err;
1965
1966         reiserfs_write_lock(dquot->dq_sb);
1967         ret =
1968             journal_begin(&th, dquot->dq_sb,
1969                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1970         if (ret) {
1971                 /* Release dquot anyway to avoid endless cycle in dqput() */
1972                 dquot_release(dquot);
1973                 goto out;
1974         }
1975         ret = dquot_release(dquot);
1976         err =
1977             journal_end(&th, dquot->dq_sb,
1978                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1979         if (!ret && err)
1980                 ret = err;
1981       out:
1982         reiserfs_write_unlock(dquot->dq_sb);
1983         return ret;
1984 }
1985
1986 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1987 {
1988         /* Are we journaling quotas? */
1989         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1990             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1991                 dquot_mark_dquot_dirty(dquot);
1992                 return reiserfs_write_dquot(dquot);
1993         } else
1994                 return dquot_mark_dquot_dirty(dquot);
1995 }
1996
1997 static int reiserfs_write_info(struct super_block *sb, int type)
1998 {
1999         struct reiserfs_transaction_handle th;
2000         int ret, err;
2001
2002         /* Data block + inode block */
2003         reiserfs_write_lock(sb);
2004         ret = journal_begin(&th, sb, 2);
2005         if (ret)
2006                 goto out;
2007         ret = dquot_commit_info(sb, type);
2008         err = journal_end(&th, sb, 2);
2009         if (!ret && err)
2010                 ret = err;
2011       out:
2012         reiserfs_write_unlock(sb);
2013         return ret;
2014 }
2015
2016 /*
2017  * Turn on quotas during mount time - we need to find the quota file and such...
2018  */
2019 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2020 {
2021         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2022                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2023 }
2024
2025 /*
2026  * Standard function to be called on quota_on
2027  */
2028 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2029                              char *name, int remount)
2030 {
2031         int err;
2032         struct path path;
2033         struct inode *inode;
2034         struct reiserfs_transaction_handle th;
2035
2036         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2037                 return -EINVAL;
2038         /* No more checks needed? Path and format_id are bogus anyway... */
2039         if (remount)
2040                 return vfs_quota_on(sb, type, format_id, name, 1);
2041         err = kern_path(name, LOOKUP_FOLLOW, &path);
2042         if (err)
2043                 return err;
2044         /* Quotafile not on the same filesystem? */
2045         if (path.mnt->mnt_sb != sb) {
2046                 err = -EXDEV;
2047                 goto out;
2048         }
2049         inode = path.dentry->d_inode;
2050         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2051         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2052                 err = reiserfs_unpack(inode, NULL);
2053                 if (err) {
2054                         reiserfs_warning(sb, "super-6520",
2055                                 "Unpacking tail of quota file failed"
2056                                 " (%d). Cannot turn on quotas.", err);
2057                         err = -EINVAL;
2058                         goto out;
2059                 }
2060                 mark_inode_dirty(inode);
2061         }
2062         /* Journaling quota? */
2063         if (REISERFS_SB(sb)->s_qf_names[type]) {
2064                 /* Quotafile not of fs root? */
2065                 if (path.dentry->d_parent != sb->s_root)
2066                         reiserfs_warning(sb, "super-6521",
2067                                  "Quota file not on filesystem root. "
2068                                  "Journalled quota will not work.");
2069         }
2070
2071         /*
2072          * When we journal data on quota file, we have to flush journal to see
2073          * all updates to the file when we bypass pagecache...
2074          */
2075         if (reiserfs_file_data_log(inode)) {
2076                 /* Just start temporary transaction and finish it */
2077                 err = journal_begin(&th, sb, 1);
2078                 if (err)
2079                         goto out;
2080                 err = journal_end_sync(&th, sb, 1);
2081                 if (err)
2082                         goto out;
2083         }
2084         err = vfs_quota_on_path(sb, type, format_id, &path);
2085 out:
2086         path_put(&path);
2087         return err;
2088 }
2089
2090 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2091  * acquiring the locks... As quota files are never truncated and quota code
2092  * itself serializes the operations (and noone else should touch the files)
2093  * we don't have to be afraid of races */
2094 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2095                                    size_t len, loff_t off)
2096 {
2097         struct inode *inode = sb_dqopt(sb)->files[type];
2098         unsigned long blk = off >> sb->s_blocksize_bits;
2099         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2100         size_t toread;
2101         struct buffer_head tmp_bh, *bh;
2102         loff_t i_size = i_size_read(inode);
2103
2104         if (off > i_size)
2105                 return 0;
2106         if (off + len > i_size)
2107                 len = i_size - off;
2108         toread = len;
2109         while (toread > 0) {
2110                 tocopy =
2111                     sb->s_blocksize - offset <
2112                     toread ? sb->s_blocksize - offset : toread;
2113                 tmp_bh.b_state = 0;
2114                 /* Quota files are without tails so we can safely use this function */
2115                 reiserfs_write_lock(sb);
2116                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2117                 reiserfs_write_unlock(sb);
2118                 if (err)
2119                         return err;
2120                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2121                         memset(data, 0, tocopy);
2122                 else {
2123                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2124                         if (!bh)
2125                                 return -EIO;
2126                         memcpy(data, bh->b_data + offset, tocopy);
2127                         brelse(bh);
2128                 }
2129                 offset = 0;
2130                 toread -= tocopy;
2131                 data += tocopy;
2132                 blk++;
2133         }
2134         return len;
2135 }
2136
2137 /* Write to quotafile (we know the transaction is already started and has
2138  * enough credits) */
2139 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2140                                     const char *data, size_t len, loff_t off)
2141 {
2142         struct inode *inode = sb_dqopt(sb)->files[type];
2143         unsigned long blk = off >> sb->s_blocksize_bits;
2144         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2145         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2146         size_t towrite = len;
2147         struct buffer_head tmp_bh, *bh;
2148
2149         if (!current->journal_info) {
2150                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2151                         " cancelled because transaction is not started.\n",
2152                         (unsigned long long)off, (unsigned long long)len);
2153                 return -EIO;
2154         }
2155         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2156         while (towrite > 0) {
2157                 tocopy = sb->s_blocksize - offset < towrite ?
2158                     sb->s_blocksize - offset : towrite;
2159                 tmp_bh.b_state = 0;
2160                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2161                 if (err)
2162                         goto out;
2163                 if (offset || tocopy != sb->s_blocksize)
2164                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2165                 else
2166                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2167                 if (!bh) {
2168                         err = -EIO;
2169                         goto out;
2170                 }
2171                 lock_buffer(bh);
2172                 memcpy(bh->b_data + offset, data, tocopy);
2173                 flush_dcache_page(bh->b_page);
2174                 set_buffer_uptodate(bh);
2175                 unlock_buffer(bh);
2176                 reiserfs_prepare_for_journal(sb, bh, 1);
2177                 journal_mark_dirty(current->journal_info, sb, bh);
2178                 if (!journal_quota)
2179                         reiserfs_add_ordered_list(inode, bh);
2180                 brelse(bh);
2181                 offset = 0;
2182                 towrite -= tocopy;
2183                 data += tocopy;
2184                 blk++;
2185         }
2186 out:
2187         if (len == towrite) {
2188                 mutex_unlock(&inode->i_mutex);
2189                 return err;
2190         }
2191         if (inode->i_size < off + len - towrite)
2192                 i_size_write(inode, off + len - towrite);
2193         inode->i_version++;
2194         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2195         mark_inode_dirty(inode);
2196         mutex_unlock(&inode->i_mutex);
2197         return len - towrite;
2198 }
2199
2200 #endif
2201
2202 static int get_super_block(struct file_system_type *fs_type,
2203                            int flags, const char *dev_name,
2204                            void *data, struct vfsmount *mnt)
2205 {
2206         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2207                            mnt);
2208 }
2209
2210 static int __init init_reiserfs_fs(void)
2211 {
2212         int ret;
2213
2214         if ((ret = init_inodecache())) {
2215                 return ret;
2216         }
2217
2218         reiserfs_proc_info_global_init();
2219         reiserfs_proc_register_global("version",
2220                                       reiserfs_global_version_in_proc);
2221
2222         ret = register_filesystem(&reiserfs_fs_type);
2223
2224         if (ret == 0) {
2225                 return 0;
2226         }
2227
2228         reiserfs_proc_unregister_global("version");
2229         reiserfs_proc_info_global_done();
2230         destroy_inodecache();
2231
2232         return ret;
2233 }
2234
2235 static void __exit exit_reiserfs_fs(void)
2236 {
2237         reiserfs_proc_unregister_global("version");
2238         reiserfs_proc_info_global_done();
2239         unregister_filesystem(&reiserfs_fs_type);
2240         destroy_inodecache();
2241 }
2242
2243 struct file_system_type reiserfs_fs_type = {
2244         .owner = THIS_MODULE,
2245         .name = "reiserfs",
2246         .get_sb = get_super_block,
2247         .kill_sb = reiserfs_kill_sb,
2248         .fs_flags = FS_REQUIRES_DEV,
2249 };
2250
2251 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2252 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2253 MODULE_LICENSE("GPL");
2254
2255 module_init(init_reiserfs_fs);
2256 module_exit(exit_reiserfs_fs);