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   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/mount.h>
  28 #include <linux/namei.h>
  29 #include <linux/crc32.h>
  30 #include <linux/smp_lock.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         struct reiserfs_transaction_handle th;
  68
  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         return 0;
  77 }
  78
  79 static void reiserfs_write_super(struct super_block *s)
  80 {
  81         reiserfs_sync_fs(s, 1);
  82 }
  83
  84 static int reiserfs_freeze(struct super_block *s)
  85 {
  86         struct reiserfs_transaction_handle th;
  87         reiserfs_write_lock(s);
  88         if (!(s->s_flags & MS_RDONLY)) {
  89                 int err = journal_begin(&th, s, 1);
  90                 if (err) {
  91                         reiserfs_block_writes(&th);
  92                 } else {
  93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  94                                                      1);
  95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  96                         reiserfs_block_writes(&th);
  97                         journal_end_sync(&th, s, 1);
  98                 }
  99         }
 100         s->s_dirt = 0;
 101         reiserfs_write_unlock(s);
 102         return 0;
 103 }
 104
 105 static int reiserfs_unfreeze(struct super_block *s)
 106 {
 107         reiserfs_allow_writes(s);
 108         return 0;
 109 }
 110
 111 extern const struct in_core_key MAX_IN_CORE_KEY;
 112
 113 /* this is used to delete "save link" when there are no items of a
 114    file it points to. It can either happen if unlink is completed but
 115    "save unlink" removal, or if file has both unlink and truncate
 116    pending and as unlink completes first (because key of "save link"
 117    protecting unlink is bigger that a key lf "save link" which
 118    protects truncate), so there left no items to make truncate
 119    completion on */
 120 static int remove_save_link_only(struct super_block *s,
 121                                  struct reiserfs_key *key, int oid_free)
 122 {
 123         struct reiserfs_transaction_handle th;
 124         int err;
 125
 126         /* we are going to do one balancing */
 127         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 128         if (err)
 129                 return err;
 130
 131         reiserfs_delete_solid_item(&th, NULL, key);
 132         if (oid_free)
 133                 /* removals are protected by direct items */
 134                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 135
 136         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 137 }
 138
 139 #ifdef CONFIG_QUOTA
 140 static int reiserfs_quota_on_mount(struct super_block *, int);
 141 #endif
 142
 143 /* look for uncompleted unlinks and truncates and complete them */
 144 static int finish_unfinished(struct super_block *s)
 145 {
 146         INITIALIZE_PATH(path);
 147         struct cpu_key max_cpu_key, obj_key;
 148         struct reiserfs_key save_link_key, last_inode_key;
 149         int retval = 0;
 150         struct item_head *ih;
 151         struct buffer_head *bh;
 152         int item_pos;
 153         char *item;
 154         int done;
 155         struct inode *inode;
 156         int truncate;
 157 #ifdef CONFIG_QUOTA
 158         int i;
 159         int ms_active_set;
 160 #endif
 161
 162         /* compose key to look for "save" links */
 163         max_cpu_key.version = KEY_FORMAT_3_5;
 164         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 165         max_cpu_key.on_disk_key.k_objectid = ~0U;
 166         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 167         max_cpu_key.key_length = 3;
 168
 169         memset(&last_inode_key, 0, sizeof(last_inode_key));
 170
 171 #ifdef CONFIG_QUOTA
 172         /* Needed for iput() to work correctly and not trash data */
 173         if (s->s_flags & MS_ACTIVE) {
 174                 ms_active_set = 0;
 175         } else {
 176                 ms_active_set = 1;
 177                 s->s_flags |= MS_ACTIVE;
 178         }
 179         /* Turn on quotas so that they are updated correctly */
 180         for (i = 0; i < MAXQUOTAS; i++) {
 181                 if (REISERFS_SB(s)->s_qf_names[i]) {
 182                         int ret = reiserfs_quota_on_mount(s, i);
 183                         if (ret < 0)
 184                                 reiserfs_warning(s, "reiserfs-2500",
 185                                                  "cannot turn on journaled "
 186                                                  "quota: error %d", ret);
 187                 }
 188         }
 189 #endif
 190
 191         done = 0;
 192         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 193         while (!retval) {
 194                 retval = search_item(s, &max_cpu_key, &path);
 195                 if (retval != ITEM_NOT_FOUND) {
 196                         reiserfs_error(s, "vs-2140",
 197                                        "search_by_key returned %d", retval);
 198                         break;
 199                 }
 200
 201                 bh = get_last_bh(&path);
 202                 item_pos = get_item_pos(&path);
 203                 if (item_pos != B_NR_ITEMS(bh)) {
 204                         reiserfs_warning(s, "vs-2060",
 205                                          "wrong position found");
 206                         break;
 207                 }
 208                 item_pos--;
 209                 ih = B_N_PITEM_HEAD(bh, item_pos);
 210
 211                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 212                         /* there are no "save" links anymore */
 213                         break;
 214
 215                 save_link_key = ih->ih_key;
 216                 if (is_indirect_le_ih(ih))
 217                         truncate = 1;
 218                 else
 219                         truncate = 0;
 220
 221                 /* reiserfs_iget needs k_dirid and k_objectid only */
 222                 item = B_I_PITEM(bh, ih);
 223                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 224                 obj_key.on_disk_key.k_objectid =
 225                     le32_to_cpu(ih->ih_key.k_objectid);
 226                 obj_key.on_disk_key.k_offset = 0;
 227                 obj_key.on_disk_key.k_type = 0;
 228
 229                 pathrelse(&path);
 230
 231                 inode = reiserfs_iget(s, &obj_key);
 232                 if (!inode) {
 233                         /* the unlink almost completed, it just did not manage to remove
 234                            "save" link and release objectid */
 235                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 236                                          &obj_key);
 237                         retval = remove_save_link_only(s, &save_link_key, 1);
 238                         continue;
 239                 }
 240
 241                 if (!truncate && inode->i_nlink) {
 242                         /* file is not unlinked */
 243                         reiserfs_warning(s, "vs-2185",
 244                                          "file %K is not unlinked",
 245                                          &obj_key);
 246                         retval = remove_save_link_only(s, &save_link_key, 0);
 247                         continue;
 248                 }
 249                 vfs_dq_init(inode);
 250
 251                 if (truncate && S_ISDIR(inode->i_mode)) {
 252                         /* We got a truncate request for a dir which is impossible.
 253                            The only imaginable way is to execute unfinished truncate request
 254                            then boot into old kernel, remove the file and create dir with
 255                            the same key. */
 256                         reiserfs_warning(s, "green-2101",
 257                                          "impossible truncate on a "
 258                                          "directory %k. Please report",
 259                                          INODE_PKEY(inode));
 260                         retval = remove_save_link_only(s, &save_link_key, 0);
 261                         truncate = 0;
 262                         iput(inode);
 263                         continue;
 264                 }
 265
 266                 if (truncate) {
 267                         REISERFS_I(inode)->i_flags |=
 268                             i_link_saved_truncate_mask;
 269                         /* not completed truncate found. New size was committed together
 270                            with "save" link */
 271                         reiserfs_info(s, "Truncating %k to %Ld ..",
 272                                       INODE_PKEY(inode), inode->i_size);
 273                         reiserfs_truncate_file(inode,
 274                                                0
 275                                                /*don't update modification time */
 276                                                );
 277                         retval = remove_save_link(inode, truncate);
 278                 } else {
 279                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 280                         /* not completed unlink (rmdir) found */
 281                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 282                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 283                                         sizeof(last_inode_key))){
 284                                 last_inode_key = *INODE_PKEY(inode);
 285                                 /* removal gets completed in iput */
 286                                 retval = 0;
 287                         } else {
 288                                 reiserfs_warning(s, "super-2189", "Dead loop "
 289                                                  "in finish_unfinished "
 290                                                  "detected, just remove "
 291                                                  "save link\n");
 292                                 retval = remove_save_link_only(s,
 293                                                         &save_link_key, 0);
 294                         }
 295                 }
 296
 297                 iput(inode);
 298                 printk("done\n");
 299                 done++;
 300         }
 301         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 302
 303 #ifdef CONFIG_QUOTA
 304         /* Turn quotas off */
 305         for (i = 0; i < MAXQUOTAS; i++) {
 306                 if (sb_dqopt(s)->files[i])
 307                         vfs_quota_off(s, i, 0);
 308         }
 309         if (ms_active_set)
 310                 /* Restore the flag back */
 311                 s->s_flags &= ~MS_ACTIVE;
 312 #endif
 313         pathrelse(&path);
 314         if (done)
 315                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 316                               "Completed\n", done);
 317         return retval;
 318 }
 319
 320 /* to protect file being unlinked from getting lost we "safe" link files
 321    being unlinked. This link will be deleted in the same transaction with last
 322    item of file. mounting the filesystem we scan all these links and remove
 323    files which almost got lost */
 324 void add_save_link(struct reiserfs_transaction_handle *th,
 325                    struct inode *inode, int truncate)
 326 {
 327         INITIALIZE_PATH(path);
 328         int retval;
 329         struct cpu_key key;
 330         struct item_head ih;
 331         __le32 link;
 332
 333         BUG_ON(!th->t_trans_id);
 334
 335         /* file can only get one "save link" of each kind */
 336         RFALSE(truncate &&
 337                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 338                "saved link already exists for truncated inode %lx",
 339                (long)inode->i_ino);
 340         RFALSE(!truncate &&
 341                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 342                "saved link already exists for unlinked inode %lx",
 343                (long)inode->i_ino);
 344
 345         /* setup key of "save" link */
 346         key.version = KEY_FORMAT_3_5;
 347         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 348         key.on_disk_key.k_objectid = inode->i_ino;
 349         if (!truncate) {
 350                 /* unlink, rmdir, rename */
 351                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 352                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 353
 354                 /* item head of "safe" link */
 355                 make_le_item_head(&ih, &key, key.version,
 356                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 357                                   4 /*length */ , 0xffff /*free space */ );
 358         } else {
 359                 /* truncate */
 360                 if (S_ISDIR(inode->i_mode))
 361                         reiserfs_warning(inode->i_sb, "green-2102",
 362                                          "Adding a truncate savelink for "
 363                                          "a directory %k! Please report",
 364                                          INODE_PKEY(inode));
 365                 set_cpu_key_k_offset(&key, 1);
 366                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 367
 368                 /* item head of "safe" link */
 369                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 370                                   4 /*length */ , 0 /*free space */ );
 371         }
 372         key.key_length = 3;
 373
 374         /* look for its place in the tree */
 375         retval = search_item(inode->i_sb, &key, &path);
 376         if (retval != ITEM_NOT_FOUND) {
 377                 if (retval != -ENOSPC)
 378                         reiserfs_error(inode->i_sb, "vs-2100",
 379                                        "search_by_key (%K) returned %d", &key,
 380                                        retval);
 381                 pathrelse(&path);
 382                 return;
 383         }
 384
 385         /* body of "save" link */
 386         link = INODE_PKEY(inode)->k_dir_id;
 387
 388         /* put "save" link inot tree, don't charge quota to anyone */
 389         retval =
 390             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 391         if (retval) {
 392                 if (retval != -ENOSPC)
 393                         reiserfs_error(inode->i_sb, "vs-2120",
 394                                        "insert_item returned %d", retval);
 395         } else {
 396                 if (truncate)
 397                         REISERFS_I(inode)->i_flags |=
 398                             i_link_saved_truncate_mask;
 399                 else
 400                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 401         }
 402 }
 403
 404 /* this opens transaction unlike add_save_link */
 405 int remove_save_link(struct inode *inode, int truncate)
 406 {
 407         struct reiserfs_transaction_handle th;
 408         struct reiserfs_key key;
 409         int err;
 410
 411         /* we are going to do one balancing only */
 412         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 413         if (err)
 414                 return err;
 415
 416         /* setup key of "save" link */
 417         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 418         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 419         if (!truncate) {
 420                 /* unlink, rmdir, rename */
 421                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 422                                     1 + inode->i_sb->s_blocksize);
 423                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 424         } else {
 425                 /* truncate */
 426                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 427                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 428         }
 429
 430         if ((truncate &&
 431              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 432             (!truncate &&
 433              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 434                 /* don't take quota bytes from anywhere */
 435                 reiserfs_delete_solid_item(&th, NULL, &key);
 436         if (!truncate) {
 437                 reiserfs_release_objectid(&th, inode->i_ino);
 438                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 439         } else
 440                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 441
 442         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 443 }
 444
 445 static void reiserfs_kill_sb(struct super_block *s)
 446 {
 447         if (REISERFS_SB(s)) {
 448                 if (REISERFS_SB(s)->xattr_root) {
 449                         d_invalidate(REISERFS_SB(s)->xattr_root);
 450                         dput(REISERFS_SB(s)->xattr_root);
 451                         REISERFS_SB(s)->xattr_root = NULL;
 452                 }
 453                 if (REISERFS_SB(s)->priv_root) {
 454                         d_invalidate(REISERFS_SB(s)->priv_root);
 455                         dput(REISERFS_SB(s)->priv_root);
 456                         REISERFS_SB(s)->priv_root = NULL;
 457                 }
 458         }
 459
 460         kill_block_super(s);
 461 }
 462
 463 static void reiserfs_put_super(struct super_block *s)
 464 {
 465         struct reiserfs_transaction_handle th;
 466         th.t_trans_id = 0;
 467
 468         reiserfs_write_lock(s);
 469
 470         if (s->s_dirt)
 471                 reiserfs_write_super(s);
 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         reiserfs_write_unlock(s);
 503         mutex_destroy(&REISERFS_SB(s)->lock);
 504         kfree(s->s_fs_info);
 505         s->s_fs_info = NULL;
 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 }
 532
 533 static int init_inodecache(void)
 534 {
 535         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 536                                                   sizeof(struct
 537                                                          reiserfs_inode_info),
 538                                                   0, (SLAB_RECLAIM_ACCOUNT|
 539                                                         SLAB_MEM_SPREAD),
 540                                                   init_once);
 541         if (reiserfs_inode_cachep == NULL)
 542                 return -ENOMEM;
 543         return 0;
 544 }
 545
 546 static void destroy_inodecache(void)
 547 {
 548         kmem_cache_destroy(reiserfs_inode_cachep);
 549 }
 550
 551 /* we don't mark inodes dirty, we just log them */
 552 static void reiserfs_dirty_inode(struct inode *inode)
 553 {
 554         struct reiserfs_transaction_handle th;
 555
 556         int err = 0;
 557         int lock_depth;
 558
 559         if (inode->i_sb->s_flags & MS_RDONLY) {
 560                 reiserfs_warning(inode->i_sb, "clm-6006",
 561                                  "writing inode %lu on readonly FS",
 562                                  inode->i_ino);
 563                 return;
 564         }
 565         lock_depth = reiserfs_write_lock_once(inode->i_sb);
 566
 567         /* this is really only used for atime updates, so they don't have
 568          ** to be included in O_SYNC or fsync
 569          */
 570         err = journal_begin(&th, inode->i_sb, 1);
 571         if (err)
 572                 goto out;
 573
 574         reiserfs_update_sd(&th, inode);
 575         journal_end(&th, inode->i_sb, 1);
 576
 577 out:
 578         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 579 }
 580
 581 static void reiserfs_clear_inode(struct inode *inode)
 582 {
 583         vfs_dq_drop(inode);
 584 }
 585
 586 #ifdef CONFIG_QUOTA
 587 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 588                                     size_t, loff_t);
 589 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 590                                    loff_t);
 591 #endif
 592
 593 static const struct super_operations reiserfs_sops = {
 594         .alloc_inode = reiserfs_alloc_inode,
 595         .destroy_inode = reiserfs_destroy_inode,
 596         .write_inode = reiserfs_write_inode,
 597         .dirty_inode = reiserfs_dirty_inode,
 598         .clear_inode = reiserfs_clear_inode,
 599         .delete_inode = reiserfs_delete_inode,
 600         .put_super = reiserfs_put_super,
 601         .write_super = reiserfs_write_super,
 602         .sync_fs = reiserfs_sync_fs,
 603         .freeze_fs = reiserfs_freeze,
 604         .unfreeze_fs = reiserfs_unfreeze,
 605         .statfs = reiserfs_statfs,
 606         .remount_fs = reiserfs_remount,
 607         .show_options = generic_show_options,
 608 #ifdef CONFIG_QUOTA
 609         .quota_read = reiserfs_quota_read,
 610         .quota_write = reiserfs_quota_write,
 611 #endif
 612 };
 613
 614 #ifdef CONFIG_QUOTA
 615 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 616
 617 static int reiserfs_write_dquot(struct dquot *);
 618 static int reiserfs_acquire_dquot(struct dquot *);
 619 static int reiserfs_release_dquot(struct dquot *);
 620 static int reiserfs_mark_dquot_dirty(struct dquot *);
 621 static int reiserfs_write_info(struct super_block *, int);
 622 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
 623
 624 static const struct dquot_operations reiserfs_quota_operations = {
 625         .initialize = dquot_initialize,
 626         .drop = dquot_drop,
 627         .write_dquot = reiserfs_write_dquot,
 628         .acquire_dquot = reiserfs_acquire_dquot,
 629         .release_dquot = reiserfs_release_dquot,
 630         .mark_dirty = reiserfs_mark_dquot_dirty,
 631         .write_info = reiserfs_write_info,
 632         .alloc_dquot    = dquot_alloc,
 633         .destroy_dquot  = dquot_destroy,
 634 };
 635
 636 static const struct quotactl_ops reiserfs_qctl_operations = {
 637         .quota_on = reiserfs_quota_on,
 638         .quota_off = vfs_quota_off,
 639         .quota_sync = vfs_quota_sync,
 640         .get_info = vfs_get_dqinfo,
 641         .set_info = vfs_set_dqinfo,
 642         .get_dqblk = vfs_get_dqblk,
 643         .set_dqblk = vfs_set_dqblk,
 644 };
 645 #endif
 646
 647 static const struct export_operations reiserfs_export_ops = {
 648         .encode_fh = reiserfs_encode_fh,
 649         .fh_to_dentry = reiserfs_fh_to_dentry,
 650         .fh_to_parent = reiserfs_fh_to_parent,
 651         .get_parent = reiserfs_get_parent,
 652 };
 653
 654 /* this struct is used in reiserfs_getopt () for containing the value for those
 655    mount options that have values rather than being toggles. */
 656 typedef struct {
 657         char *value;
 658         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 659                                    value is found, 0 is no bits are to be changed. */
 660         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 661                                    value is found, 0 is no bits are to be changed. This is
 662                                    applied BEFORE setmask */
 663 } arg_desc_t;
 664
 665 /* Set this bit in arg_required to allow empty arguments */
 666 #define REISERFS_OPT_ALLOWEMPTY 31
 667
 668 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 669    mount options */
 670 typedef struct {
 671         char *option_name;
 672         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 673         const arg_desc_t *values;       /* list of values accepted by an option */
 674         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 675                                    value is found, 0 is no bits are to be changed. */
 676         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 677                                    value is found, 0 is no bits are to be changed. This is
 678                                    applied BEFORE setmask */
 679 } opt_desc_t;
 680
 681 /* possible values for -o data= */
 682 static const arg_desc_t logging_mode[] = {
 683         {"ordered", 1 << REISERFS_DATA_ORDERED,
 684          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 685         {"journal", 1 << REISERFS_DATA_LOG,
 686          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 687         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 688          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 689         {.value = NULL}
 690 };
 691
 692 /* possible values for -o barrier= */
 693 static const arg_desc_t barrier_mode[] = {
 694         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 695         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 696         {.value = NULL}
 697 };
 698
 699 /* possible values for "-o block-allocator=" and bits which are to be set in
 700    s_mount_opt of reiserfs specific part of in-core super block */
 701 static const arg_desc_t balloc[] = {
 702         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 703         {"border", 0, 1 << REISERFS_NO_BORDER},
 704         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 705         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 706         {"test4", 1 << REISERFS_TEST4, 0},
 707         {"notest4", 0, 1 << REISERFS_TEST4},
 708         {NULL, 0, 0}
 709 };
 710
 711 static const arg_desc_t tails[] = {
 712         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 713         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 714         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 715         {NULL, 0, 0}
 716 };
 717
 718 static const arg_desc_t error_actions[] = {
 719         {"panic", 1 << REISERFS_ERROR_PANIC,
 720          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 721         {"ro-remount", 1 << REISERFS_ERROR_RO,
 722          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 723 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 724         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 725          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 726 #endif
 727         {NULL, 0, 0},
 728 };
 729
 730 /* proceed only one option from a list *cur - string containing of mount options
 731    opts - array of options which are accepted
 732    opt_arg - if option is found and requires an argument and if it is specifed
 733    in the input - pointer to the argument is stored here
 734    bit_flags - if option requires to set a certain bit - it is set here
 735    return -1 if unknown option is found, opt->arg_required otherwise */
 736 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 737                            char **opt_arg, unsigned long *bit_flags)
 738 {
 739         char *p;
 740         /* foo=bar,
 741            ^   ^  ^
 742            |   |  +-- option_end
 743            |   +-- arg_start
 744            +-- option_start
 745          */
 746         const opt_desc_t *opt;
 747         const arg_desc_t *arg;
 748
 749         p = *cur;
 750
 751         /* assume argument cannot contain commas */
 752         *cur = strchr(p, ',');
 753         if (*cur) {
 754                 *(*cur) = '\0';
 755                 (*cur)++;
 756         }
 757
 758         if (!strncmp(p, "alloc=", 6)) {
 759                 /* Ugly special case, probably we should redo options parser so that
 760                    it can understand several arguments for some options, also so that
 761                    it can fill several bitfields with option values. */
 762                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 763                         return -1;
 764                 } else {
 765                         return 0;
 766                 }
 767         }
 768
 769         /* for every option in the list */
 770         for (opt = opts; opt->option_name; opt++) {
 771                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 772                         if (bit_flags) {
 773                                 if (opt->clrmask ==
 774                                     (1 << REISERFS_UNSUPPORTED_OPT))
 775                                         reiserfs_warning(s, "super-6500",
 776                                                          "%s not supported.\n",
 777                                                          p);
 778                                 else
 779                                         *bit_flags &= ~opt->clrmask;
 780                                 if (opt->setmask ==
 781                                     (1 << REISERFS_UNSUPPORTED_OPT))
 782                                         reiserfs_warning(s, "super-6501",
 783                                                          "%s not supported.\n",
 784                                                          p);
 785                                 else
 786                                         *bit_flags |= opt->setmask;
 787                         }
 788                         break;
 789                 }
 790         }
 791         if (!opt->option_name) {
 792                 reiserfs_warning(s, "super-6502",
 793                                  "unknown mount option \"%s\"", p);
 794                 return -1;
 795         }
 796
 797         p += strlen(opt->option_name);
 798         switch (*p) {
 799         case '=':
 800                 if (!opt->arg_required) {
 801                         reiserfs_warning(s, "super-6503",
 802                                          "the option \"%s\" does not "
 803                                          "require an argument\n",
 804                                          opt->option_name);
 805                         return -1;
 806                 }
 807                 break;
 808
 809         case 0:
 810                 if (opt->arg_required) {
 811                         reiserfs_warning(s, "super-6504",
 812                                          "the option \"%s\" requires an "
 813                                          "argument\n", opt->option_name);
 814                         return -1;
 815                 }
 816                 break;
 817         default:
 818                 reiserfs_warning(s, "super-6505",
 819                                  "head of option \"%s\" is only correct\n",
 820                                  opt->option_name);
 821                 return -1;
 822         }
 823
 824         /* move to the argument, or to next option if argument is not required */
 825         p++;
 826
 827         if (opt->arg_required
 828             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 829             && !strlen(p)) {
 830                 /* this catches "option=," if not allowed */
 831                 reiserfs_warning(s, "super-6506",
 832                                  "empty argument for \"%s\"\n",
 833                                  opt->option_name);
 834                 return -1;
 835         }
 836
 837         if (!opt->values) {
 838                 /* *=NULLopt_arg contains pointer to argument */
 839                 *opt_arg = p;
 840                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 841         }
 842
 843         /* values possible for this option are listed in opt->values */
 844         for (arg = opt->values; arg->value; arg++) {
 845                 if (!strcmp(p, arg->value)) {
 846                         if (bit_flags) {
 847                                 *bit_flags &= ~arg->clrmask;
 848                                 *bit_flags |= arg->setmask;
 849                         }
 850                         return opt->arg_required;
 851                 }
 852         }
 853
 854         reiserfs_warning(s, "super-6506",
 855                          "bad value \"%s\" for option \"%s\"\n", p,
 856                          opt->option_name);
 857         return -1;
 858 }
 859
 860 /* returns 0 if something is wrong in option string, 1 - otherwise */
 861 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 862                                   unsigned long *mount_options,
 863                                   /* after the parsing phase, contains the
 864                                      collection of bitflags defining what
 865                                      mount options were selected. */
 866                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 867                                   char **jdev_name,
 868                                   unsigned int *commit_max_age,
 869                                   char **qf_names,
 870                                   unsigned int *qfmt)
 871 {
 872         int c;
 873         char *arg = NULL;
 874         char *pos;
 875         opt_desc_t opts[] = {
 876                 /* Compatibility stuff, so that -o notail for old setups still work */
 877                 {"tails",.arg_required = 't',.values = tails},
 878                 {"notail",.clrmask =
 879                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 880                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 881                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 882                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 883                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 884 #ifdef CONFIG_REISERFS_FS_XATTR
 885                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 886                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 887 #else
 888                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 889                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 890 #endif
 891 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 892                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 893                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 894 #else
 895                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 896                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 897 #endif
 898                 {.option_name = "nolog"},
 899                 {"replayonly",.setmask = 1 << REPLAYONLY},
 900                 {"block-allocator",.arg_required = 'a',.values = balloc},
 901                 {"data",.arg_required = 'd',.values = logging_mode},
 902                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 903                 {"resize",.arg_required = 'r',.values = NULL},
 904                 {"jdev",.arg_required = 'j',.values = NULL},
 905                 {"nolargeio",.arg_required = 'w',.values = NULL},
 906                 {"commit",.arg_required = 'c',.values = NULL},
 907                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 908                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 909                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 910                 {"errors",.arg_required = 'e',.values = error_actions},
 911                 {"usrjquota",.arg_required =
 912                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 913                 {"grpjquota",.arg_required =
 914                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 915                 {"jqfmt",.arg_required = 'f',.values = NULL},
 916                 {.option_name = NULL}
 917         };
 918
 919         *blocks = 0;
 920         if (!options || !*options)
 921                 /* use default configuration: create tails, journaling on, no
 922                    conversion to newest format */
 923                 return 1;
 924
 925         for (pos = options; pos;) {
 926                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 927                 if (c == -1)
 928                         /* wrong option is given */
 929                         return 0;
 930
 931                 if (c == 'r') {
 932                         char *p;
 933
 934                         p = NULL;
 935                         /* "resize=NNN" or "resize=auto" */
 936
 937                         if (!strcmp(arg, "auto")) {
 938                                 /* From JFS code, to auto-get the size. */
 939                                 *blocks =
 940                                     s->s_bdev->bd_inode->i_size >> s->
 941                                     s_blocksize_bits;
 942                         } else {
 943                                 *blocks = simple_strtoul(arg, &p, 0);
 944                                 if (*p != '\0') {
 945                                         /* NNN does not look like a number */
 946                                         reiserfs_warning(s, "super-6507",
 947                                                          "bad value %s for "
 948                                                          "-oresize\n", arg);
 949                                         return 0;
 950                                 }
 951                         }
 952                 }
 953
 954                 if (c == 'c') {
 955                         char *p = NULL;
 956                         unsigned long val = simple_strtoul(arg, &p, 0);
 957                         /* commit=NNN (time in seconds) */
 958                         if (*p != '\0' || val >= (unsigned int)-1) {
 959                                 reiserfs_warning(s, "super-6508",
 960                                                  "bad value %s for -ocommit\n",
 961                                                  arg);
 962                                 return 0;
 963                         }
 964                         *commit_max_age = (unsigned int)val;
 965                 }
 966
 967                 if (c == 'w') {
 968                         reiserfs_warning(s, "super-6509", "nolargeio option "
 969                                          "is no longer supported");
 970                         return 0;
 971                 }
 972
 973                 if (c == 'j') {
 974                         if (arg && *arg && jdev_name) {
 975                                 if (*jdev_name) {       //Hm, already assigned?
 976                                         reiserfs_warning(s, "super-6510",
 977                                                          "journal device was "
 978                                                          "already specified to "
 979                                                          "be %s", *jdev_name);
 980                                         return 0;
 981                                 }
 982                                 *jdev_name = arg;
 983                         }
 984                 }
 985 #ifdef CONFIG_QUOTA
 986                 if (c == 'u' || c == 'g') {
 987                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
 988
 989                         if (sb_any_quota_loaded(s) &&
 990                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
 991                                 reiserfs_warning(s, "super-6511",
 992                                                  "cannot change journaled "
 993                                                  "quota options when quota "
 994                                                  "turned on.");
 995                                 return 0;
 996                         }
 997                         if (*arg) {     /* Some filename specified? */
 998                                 if (REISERFS_SB(s)->s_qf_names[qtype]
 999                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1000                                               arg)) {
1001                                         reiserfs_warning(s, "super-6512",
1002                                                          "%s quota file "
1003                                                          "already specified.",
1004                                                          QTYPE2NAME(qtype));
1005                                         return 0;
1006                                 }
1007                                 if (strchr(arg, '/')) {
1008                                         reiserfs_warning(s, "super-6513",
1009                                                          "quotafile must be "
1010                                                          "on filesystem root.");
1011                                         return 0;
1012                                 }
1013                                 qf_names[qtype] =
1014                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1015                                 if (!qf_names[qtype]) {
1016                                         reiserfs_warning(s, "reiserfs-2502",
1017                                                          "not enough memory "
1018                                                          "for storing "
1019                                                          "quotafile name.");
1020                                         return 0;
1021                                 }
1022                                 strcpy(qf_names[qtype], arg);
1023                                 *mount_options |= 1 << REISERFS_QUOTA;
1024                         } else {
1025                                 if (qf_names[qtype] !=
1026                                     REISERFS_SB(s)->s_qf_names[qtype])
1027                                         kfree(qf_names[qtype]);
1028                                 qf_names[qtype] = NULL;
1029                         }
1030                 }
1031                 if (c == 'f') {
1032                         if (!strcmp(arg, "vfsold"))
1033                                 *qfmt = QFMT_VFS_OLD;
1034                         else if (!strcmp(arg, "vfsv0"))
1035                                 *qfmt = QFMT_VFS_V0;
1036                         else {
1037                                 reiserfs_warning(s, "super-6514",
1038                                                  "unknown quota format "
1039                                                  "specified.");
1040                                 return 0;
1041                         }
1042                         if (sb_any_quota_loaded(s) &&
1043                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1044                                 reiserfs_warning(s, "super-6515",
1045                                                  "cannot change journaled "
1046                                                  "quota options when quota "
1047                                                  "turned on.");
1048                                 return 0;
1049                         }
1050                 }
1051 #else
1052                 if (c == 'u' || c == 'g' || c == 'f') {
1053                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1054                                          "quota options not supported.");
1055                         return 0;
1056                 }
1057 #endif
1058         }
1059
1060 #ifdef CONFIG_QUOTA
1061         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1062             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1063                 reiserfs_warning(s, "super-6515",
1064                                  "journaled quota format not specified.");
1065                 return 0;
1066         }
1067         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1068         if (!(*mount_options & (1 << REISERFS_QUOTA))
1069             && sb_any_quota_loaded(s)) {
1070                 reiserfs_warning(s, "super-6516", "quota options must "
1071                                  "be present when quota is turned on.");
1072                 return 0;
1073         }
1074 #endif
1075
1076         return 1;
1077 }
1078
1079 static void switch_data_mode(struct super_block *s, unsigned long mode)
1080 {
1081         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1082                                          (1 << REISERFS_DATA_ORDERED) |
1083                                          (1 << REISERFS_DATA_WRITEBACK));
1084         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1085 }
1086
1087 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1088 {
1089         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1090                 if (!reiserfs_data_log(s)) {
1091                         switch_data_mode(s, REISERFS_DATA_LOG);
1092                         reiserfs_info(s, "switching to journaled data mode\n");
1093                 }
1094         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1095                 if (!reiserfs_data_ordered(s)) {
1096                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1097                         reiserfs_info(s, "switching to ordered data mode\n");
1098                 }
1099         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1100                 if (!reiserfs_data_writeback(s)) {
1101                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1102                         reiserfs_info(s, "switching to writeback data mode\n");
1103                 }
1104         }
1105 }
1106
1107 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1108 {
1109         int flush = (1 << REISERFS_BARRIER_FLUSH);
1110         int none = (1 << REISERFS_BARRIER_NONE);
1111         int all_barrier = flush | none;
1112
1113         if (bits & all_barrier) {
1114                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1115                 if (bits & flush) {
1116                         REISERFS_SB(s)->s_mount_opt |= flush;
1117                         printk("reiserfs: enabling write barrier flush mode\n");
1118                 } else if (bits & none) {
1119                         REISERFS_SB(s)->s_mount_opt |= none;
1120                         printk("reiserfs: write barriers turned off\n");
1121                 }
1122         }
1123 }
1124
1125 static void handle_attrs(struct super_block *s)
1126 {
1127         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1128
1129         if (reiserfs_attrs(s)) {
1130                 if (old_format_only(s)) {
1131                         reiserfs_warning(s, "super-6517", "cannot support "
1132                                          "attributes on 3.5.x disk format");
1133                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1134                         return;
1135                 }
1136                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1137                         reiserfs_warning(s, "super-6518", "cannot support "
1138                                          "attributes until flag is set in "
1139                                          "super-block");
1140                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1141                 }
1142         }
1143 }
1144
1145 #ifdef CONFIG_QUOTA
1146 static void handle_quota_files(struct super_block *s, char **qf_names,
1147                                unsigned int *qfmt)
1148 {
1149         int i;
1150
1151         for (i = 0; i < MAXQUOTAS; i++) {
1152                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1153                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1154                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1155         }
1156         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1157 }
1158 #endif
1159
1160 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1161 {
1162         struct reiserfs_super_block *rs;
1163         struct reiserfs_transaction_handle th;
1164         unsigned long blocks;
1165         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1166         unsigned long safe_mask = 0;
1167         unsigned int commit_max_age = (unsigned int)-1;
1168         struct reiserfs_journal *journal = SB_JOURNAL(s);
1169         char *new_opts = kstrdup(arg, GFP_KERNEL);
1170         int err;
1171         char *qf_names[MAXQUOTAS];
1172         unsigned int qfmt = 0;
1173 #ifdef CONFIG_QUOTA
1174         int i;
1175 #endif
1176
1177         reiserfs_write_lock(s);
1178
1179 #ifdef CONFIG_QUOTA
1180         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1181 #endif
1182
1183         rs = SB_DISK_SUPER_BLOCK(s);
1184
1185         if (!reiserfs_parse_options
1186             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1187             qf_names, &qfmt)) {
1188 #ifdef CONFIG_QUOTA
1189                 for (i = 0; i < MAXQUOTAS; i++)
1190                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1191                                 kfree(qf_names[i]);
1192 #endif
1193                 err = -EINVAL;
1194                 goto out_err;
1195         }
1196 #ifdef CONFIG_QUOTA
1197         handle_quota_files(s, qf_names, &qfmt);
1198 #endif
1199
1200         handle_attrs(s);
1201
1202         /* Add options that are safe here */
1203         safe_mask |= 1 << REISERFS_SMALLTAIL;
1204         safe_mask |= 1 << REISERFS_LARGETAIL;
1205         safe_mask |= 1 << REISERFS_NO_BORDER;
1206         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1207         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1208         safe_mask |= 1 << REISERFS_TEST4;
1209         safe_mask |= 1 << REISERFS_ATTRS;
1210         safe_mask |= 1 << REISERFS_XATTRS_USER;
1211         safe_mask |= 1 << REISERFS_POSIXACL;
1212         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1213         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1214         safe_mask |= 1 << REISERFS_ERROR_RO;
1215         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1216         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1217         safe_mask |= 1 << REISERFS_QUOTA;
1218
1219         /* Update the bitmask, taking care to keep
1220          * the bits we're not allowed to change here */
1221         REISERFS_SB(s)->s_mount_opt =
1222             (REISERFS_SB(s)->
1223              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1224
1225         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1226                 journal->j_max_commit_age = commit_max_age;
1227                 journal->j_max_trans_age = commit_max_age;
1228         } else if (commit_max_age == 0) {
1229                 /* 0 means restore defaults. */
1230                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1231                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1232         }
1233
1234         if (blocks) {
1235                 err = reiserfs_resize(s, blocks);
1236                 if (err != 0)
1237                         goto out_err;
1238         }
1239
1240         if (*mount_flags & MS_RDONLY) {
1241                 reiserfs_xattr_init(s, *mount_flags);
1242                 /* remount read-only */
1243                 if (s->s_flags & MS_RDONLY)
1244                         /* it is read-only already */
1245                         goto out_ok;
1246                 /* try to remount file system with read-only permissions */
1247                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1248                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1249                         goto out_ok;
1250                 }
1251
1252                 err = journal_begin(&th, s, 10);
1253                 if (err)
1254                         goto out_err;
1255
1256                 /* Mounting a rw partition read-only. */
1257                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1258                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1259                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1260         } else {
1261                 /* remount read-write */
1262                 if (!(s->s_flags & MS_RDONLY)) {
1263                         reiserfs_xattr_init(s, *mount_flags);
1264                         goto out_ok;    /* We are read-write already */
1265                 }
1266
1267                 if (reiserfs_is_journal_aborted(journal)) {
1268                         err = journal->j_errno;
1269                         goto out_err;
1270                 }
1271
1272                 handle_data_mode(s, mount_options);
1273                 handle_barrier_mode(s, mount_options);
1274                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1275                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1276                 err = journal_begin(&th, s, 10);
1277                 if (err)
1278                         goto out_err;
1279
1280                 /* Mount a partition which is read-only, read-write */
1281                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1282                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1283                 s->s_flags &= ~MS_RDONLY;
1284                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1285                 if (!old_format_only(s))
1286                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1287                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1288                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1289                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1290         }
1291         /* this will force a full flush of all journal lists */
1292         SB_JOURNAL(s)->j_must_wait = 1;
1293         err = journal_end(&th, s, 10);
1294         if (err)
1295                 goto out_err;
1296         s->s_dirt = 0;
1297
1298         if (!(*mount_flags & MS_RDONLY)) {
1299                 finish_unfinished(s);
1300                 reiserfs_xattr_init(s, *mount_flags);
1301         }
1302
1303 out_ok:
1304         replace_mount_options(s, new_opts);
1305         reiserfs_write_unlock(s);
1306         return 0;
1307
1308 out_err:
1309         kfree(new_opts);
1310         reiserfs_write_unlock(s);
1311         return err;
1312 }
1313
1314 static int read_super_block(struct super_block *s, int offset)
1315 {
1316         struct buffer_head *bh;
1317         struct reiserfs_super_block *rs;
1318         int fs_blocksize;
1319
1320         bh = sb_bread(s, offset / s->s_blocksize);
1321         if (!bh) {
1322                 reiserfs_warning(s, "sh-2006",
1323                                  "bread failed (dev %s, block %lu, size %lu)",
1324                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1325                                  s->s_blocksize);
1326                 return 1;
1327         }
1328
1329         rs = (struct reiserfs_super_block *)bh->b_data;
1330         if (!is_any_reiserfs_magic_string(rs)) {
1331                 brelse(bh);
1332                 return 1;
1333         }
1334         //
1335         // ok, reiserfs signature (old or new) found in at the given offset
1336         //
1337         fs_blocksize = sb_blocksize(rs);
1338         brelse(bh);
1339         sb_set_blocksize(s, fs_blocksize);
1340
1341         bh = sb_bread(s, offset / s->s_blocksize);
1342         if (!bh) {
1343                 reiserfs_warning(s, "sh-2007",
1344                                  "bread failed (dev %s, block %lu, size %lu)",
1345                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1346                                  s->s_blocksize);
1347                 return 1;
1348         }
1349
1350         rs = (struct reiserfs_super_block *)bh->b_data;
1351         if (sb_blocksize(rs) != s->s_blocksize) {
1352                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1353                                  "filesystem on (dev %s, block %Lu, size %lu)",
1354                                  reiserfs_bdevname(s),
1355                                  (unsigned long long)bh->b_blocknr,
1356                                  s->s_blocksize);
1357                 brelse(bh);
1358                 return 1;
1359         }
1360
1361         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1362                 brelse(bh);
1363                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1364                                  "--rebuild-tree run detected. Please run\n"
1365                                  "reiserfsck --rebuild-tree and wait for a "
1366                                  "completion. If that fails\n"
1367                                  "get newer reiserfsprogs package");
1368                 return 1;
1369         }
1370
1371         SB_BUFFER_WITH_SB(s) = bh;
1372         SB_DISK_SUPER_BLOCK(s) = rs;
1373
1374         if (is_reiserfs_jr(rs)) {
1375                 /* magic is of non-standard journal filesystem, look at s_version to
1376                    find which format is in use */
1377                 if (sb_version(rs) == REISERFS_VERSION_2)
1378                         reiserfs_info(s, "found reiserfs format \"3.6\""
1379                                       " with non-standard journal\n");
1380                 else if (sb_version(rs) == REISERFS_VERSION_1)
1381                         reiserfs_info(s, "found reiserfs format \"3.5\""
1382                                       " with non-standard journal\n");
1383                 else {
1384                         reiserfs_warning(s, "sh-2012", "found unknown "
1385                                          "format \"%u\" of reiserfs with "
1386                                          "non-standard magic", sb_version(rs));
1387                         return 1;
1388                 }
1389         } else
1390                 /* s_version of standard format may contain incorrect information,
1391                    so we just look at the magic string */
1392                 reiserfs_info(s,
1393                               "found reiserfs format \"%s\" with standard journal\n",
1394                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1395
1396         s->s_op = &reiserfs_sops;
1397         s->s_export_op = &reiserfs_export_ops;
1398 #ifdef CONFIG_QUOTA
1399         s->s_qcop = &reiserfs_qctl_operations;
1400         s->dq_op = &reiserfs_quota_operations;
1401 #endif
1402
1403         /* new format is limited by the 32 bit wide i_blocks field, want to
1404          ** be one full block below that.
1405          */
1406         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1407         return 0;
1408 }
1409
1410 /* after journal replay, reread all bitmap and super blocks */
1411 static int reread_meta_blocks(struct super_block *s)
1412 {
1413         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1414         reiserfs_write_unlock(s);
1415         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1416         reiserfs_write_lock(s);
1417         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1418                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1419                 return 1;
1420         }
1421
1422         return 0;
1423 }
1424
1425 /////////////////////////////////////////////////////
1426 // hash detection stuff
1427
1428 // if root directory is empty - we set default - Yura's - hash and
1429 // warn about it
1430 // FIXME: we look for only one name in a directory. If tea and yura
1431 // bith have the same value - we ask user to send report to the
1432 // mailing list
1433 static __u32 find_hash_out(struct super_block *s)
1434 {
1435         int retval;
1436         struct inode *inode;
1437         struct cpu_key key;
1438         INITIALIZE_PATH(path);
1439         struct reiserfs_dir_entry de;
1440         __u32 hash = DEFAULT_HASH;
1441
1442         inode = s->s_root->d_inode;
1443
1444         do {                    // Some serious "goto"-hater was there ;)
1445                 u32 teahash, r5hash, yurahash;
1446
1447                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1448                 retval = search_by_entry_key(s, &key, &path, &de);
1449                 if (retval == IO_ERROR) {
1450                         pathrelse(&path);
1451                         return UNSET_HASH;
1452                 }
1453                 if (retval == NAME_NOT_FOUND)
1454                         de.de_entry_num--;
1455                 set_de_name_and_namelen(&de);
1456                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1457                         /* allow override in this case */
1458                         if (reiserfs_rupasov_hash(s)) {
1459                                 hash = YURA_HASH;
1460                         }
1461                         reiserfs_info(s, "FS seems to be empty, autodetect "
1462                                          "is using the default hash\n");
1463                         break;
1464                 }
1465                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1466                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1467                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1468                 if (((teahash == r5hash)
1469                      &&
1470                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1471                       == r5hash)) || ((teahash == yurahash)
1472                                       && (yurahash ==
1473                                           GET_HASH_VALUE(deh_offset
1474                                                          (&
1475                                                           (de.
1476                                                            de_deh[de.
1477                                                                   de_entry_num])))))
1478                     || ((r5hash == yurahash)
1479                         && (yurahash ==
1480                             GET_HASH_VALUE(deh_offset
1481                                            (&(de.de_deh[de.de_entry_num])))))) {
1482                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1483                                          "automatically detect hash function. "
1484                                          "Please mount with -o "
1485                                          "hash={tea,rupasov,r5}");
1486                         hash = UNSET_HASH;
1487                         break;
1488                 }
1489                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1490                     yurahash)
1491                         hash = YURA_HASH;
1492                 else if (GET_HASH_VALUE
1493                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1494                         hash = TEA_HASH;
1495                 else if (GET_HASH_VALUE
1496                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1497                         hash = R5_HASH;
1498                 else {
1499                         reiserfs_warning(s, "reiserfs-2506",
1500                                          "Unrecognised hash function");
1501                         hash = UNSET_HASH;
1502                 }
1503         } while (0);
1504
1505         pathrelse(&path);
1506         return hash;
1507 }
1508
1509 // finds out which hash names are sorted with
1510 static int what_hash(struct super_block *s)
1511 {
1512         __u32 code;
1513
1514         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1515
1516         /* reiserfs_hash_detect() == true if any of the hash mount options
1517          ** were used.  We must check them to make sure the user isn't
1518          ** using a bad hash value
1519          */
1520         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1521                 code = find_hash_out(s);
1522
1523         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1524                 /* detection has found the hash, and we must check against the
1525                  ** mount options
1526                  */
1527                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1528                         reiserfs_warning(s, "reiserfs-2507",
1529                                          "Error, %s hash detected, "
1530                                          "unable to force rupasov hash",
1531                                          reiserfs_hashname(code));
1532                         code = UNSET_HASH;
1533                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1534                         reiserfs_warning(s, "reiserfs-2508",
1535                                          "Error, %s hash detected, "
1536                                          "unable to force tea hash",
1537                                          reiserfs_hashname(code));
1538                         code = UNSET_HASH;
1539                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1540                         reiserfs_warning(s, "reiserfs-2509",
1541                                          "Error, %s hash detected, "
1542                                          "unable to force r5 hash",
1543                                          reiserfs_hashname(code));
1544                         code = UNSET_HASH;
1545                 }
1546         } else {
1547                 /* find_hash_out was not called or could not determine the hash */
1548                 if (reiserfs_rupasov_hash(s)) {
1549                         code = YURA_HASH;
1550                 } else if (reiserfs_tea_hash(s)) {
1551                         code = TEA_HASH;
1552                 } else if (reiserfs_r5_hash(s)) {
1553                         code = R5_HASH;
1554                 }
1555         }
1556
1557         /* if we are mounted RW, and we have a new valid hash code, update
1558          ** the super
1559          */
1560         if (code != UNSET_HASH &&
1561             !(s->s_flags & MS_RDONLY) &&
1562             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1563                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1564         }
1565         return code;
1566 }
1567
1568 // return pointer to appropriate function
1569 static hashf_t hash_function(struct super_block *s)
1570 {
1571         switch (what_hash(s)) {
1572         case TEA_HASH:
1573                 reiserfs_info(s, "Using tea hash to sort names\n");
1574                 return keyed_hash;
1575         case YURA_HASH:
1576                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1577                 return yura_hash;
1578         case R5_HASH:
1579                 reiserfs_info(s, "Using r5 hash to sort names\n");
1580                 return r5_hash;
1581         }
1582         return NULL;
1583 }
1584
1585 // this is used to set up correct value for old partitions
1586 static int function2code(hashf_t func)
1587 {
1588         if (func == keyed_hash)
1589                 return TEA_HASH;
1590         if (func == yura_hash)
1591                 return YURA_HASH;
1592         if (func == r5_hash)
1593                 return R5_HASH;
1594
1595         BUG();                  // should never happen
1596
1597         return 0;
1598 }
1599
1600 #define SWARN(silent, s, id, ...)                       \
1601         if (!(silent))                          \
1602                 reiserfs_warning(s, id, __VA_ARGS__)
1603
1604 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1605 {
1606         struct inode *root_inode;
1607         struct reiserfs_transaction_handle th;
1608         int old_format = 0;
1609         unsigned long blocks;
1610         unsigned int commit_max_age = 0;
1611         int jinit_done = 0;
1612         struct reiserfs_iget_args args;
1613         struct reiserfs_super_block *rs;
1614         char *jdev_name;
1615         struct reiserfs_sb_info *sbi;
1616         int errval = -EINVAL;
1617         char *qf_names[MAXQUOTAS] = {};
1618         unsigned int qfmt = 0;
1619
1620         save_mount_options(s, data);
1621
1622         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1623         if (!sbi) {
1624                 errval = -ENOMEM;
1625                 goto error_alloc;
1626         }
1627         s->s_fs_info = sbi;
1628         /* Set default values for options: non-aggressive tails, RO on errors */
1629         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1630         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1631         /* no preallocation minimum, be smart in
1632            reiserfs_file_write instead */
1633         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1634         /* Preallocate by 16 blocks (17-1) at once */
1635         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1636         /* setup default block allocator options */
1637         reiserfs_init_alloc_options(s);
1638
1639         mutex_init(&REISERFS_SB(s)->lock);
1640         REISERFS_SB(s)->lock_depth = -1;
1641
1642         /*
1643          * This function is called with the bkl, which also was the old
1644          * locking used here.
1645          * do_journal_begin() will soon check if we hold the lock (ie: was the
1646          * bkl). This is likely because do_journal_begin() has several another
1647          * callers because at this time, it doesn't seem to be necessary to
1648          * protect against anything.
1649          * Anyway, let's be conservative and lock for now.
1650          */
1651         reiserfs_write_lock(s);
1652
1653         jdev_name = NULL;
1654         if (reiserfs_parse_options
1655             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1656              &commit_max_age, qf_names, &qfmt) == 0) {
1657                 goto error;
1658         }
1659 #ifdef CONFIG_QUOTA
1660         handle_quota_files(s, qf_names, &qfmt);
1661 #endif
1662
1663         if (blocks) {
1664                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1665                 goto error;
1666         }
1667
1668         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1669         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1670                 old_format = 1;
1671         /* try new format (64-th 1k block), which can contain reiserfs super block */
1672         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1673                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1674                       reiserfs_bdevname(s));
1675                 goto error;
1676         }
1677
1678         rs = SB_DISK_SUPER_BLOCK(s);
1679         /* Let's do basic sanity check to verify that underlying device is not
1680            smaller than the filesystem. If the check fails then abort and scream,
1681            because bad stuff will happen otherwise. */
1682         if (s->s_bdev && s->s_bdev->bd_inode
1683             && i_size_read(s->s_bdev->bd_inode) <
1684             sb_block_count(rs) * sb_blocksize(rs)) {
1685                 SWARN(silent, s, "", "Filesystem cannot be "
1686                       "mounted because it is bigger than the device");
1687                 SWARN(silent, s, "", "You may need to run fsck "
1688                       "or increase size of your LVM partition");
1689                 SWARN(silent, s, "", "Or may be you forgot to "
1690                       "reboot after fdisk when it told you to");
1691                 goto error;
1692         }
1693
1694         sbi->s_mount_state = SB_REISERFS_STATE(s);
1695         sbi->s_mount_state = REISERFS_VALID_FS;
1696
1697         if ((errval = reiserfs_init_bitmap_cache(s))) {
1698                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1699                 goto error;
1700         }
1701         errval = -EINVAL;
1702 #ifdef CONFIG_REISERFS_CHECK
1703         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1704         SWARN(silent, s, "", "- it is slow mode for debugging.");
1705 #endif
1706
1707         /* make data=ordered the default */
1708         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1709             !reiserfs_data_writeback(s)) {
1710                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1711         }
1712
1713         if (reiserfs_data_log(s)) {
1714                 reiserfs_info(s, "using journaled data mode\n");
1715         } else if (reiserfs_data_ordered(s)) {
1716                 reiserfs_info(s, "using ordered data mode\n");
1717         } else {
1718                 reiserfs_info(s, "using writeback data mode\n");
1719         }
1720         if (reiserfs_barrier_flush(s)) {
1721                 printk("reiserfs: using flush barriers\n");
1722         }
1723         // set_device_ro(s->s_dev, 1) ;
1724         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1725                 SWARN(silent, s, "sh-2022",
1726                       "unable to initialize journal space");
1727                 goto error;
1728         } else {
1729                 jinit_done = 1; /* once this is set, journal_release must be called
1730                                  ** if we error out of the mount
1731                                  */
1732         }
1733         if (reread_meta_blocks(s)) {
1734                 SWARN(silent, s, "jmacd-9",
1735                       "unable to reread meta blocks after journal init");
1736                 goto error;
1737         }
1738
1739         if (replay_only(s))
1740                 goto error;
1741
1742         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1743                 SWARN(silent, s, "clm-7000",
1744                       "Detected readonly device, marking FS readonly");
1745                 s->s_flags |= MS_RDONLY;
1746         }
1747         args.objectid = REISERFS_ROOT_OBJECTID;
1748         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1749         root_inode =
1750             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1751                          reiserfs_init_locked_inode, (void *)(&args));
1752         if (!root_inode) {
1753                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1754                 goto error;
1755         }
1756
1757         if (root_inode->i_state & I_NEW) {
1758                 reiserfs_read_locked_inode(root_inode, &args);
1759                 unlock_new_inode(root_inode);
1760         }
1761
1762         s->s_root = d_alloc_root(root_inode);
1763         if (!s->s_root) {
1764                 iput(root_inode);
1765                 goto error;
1766         }
1767         // define and initialize hash function
1768         sbi->s_hash_function = hash_function(s);
1769         if (sbi->s_hash_function == NULL) {
1770                 dput(s->s_root);
1771                 s->s_root = NULL;
1772                 goto error;
1773         }
1774
1775         if (is_reiserfs_3_5(rs)
1776             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1777                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1778         else if (old_format)
1779                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1780         else
1781                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1782
1783         if (!(s->s_flags & MS_RDONLY)) {
1784
1785                 errval = journal_begin(&th, s, 1);
1786                 if (errval) {
1787                         dput(s->s_root);
1788                         s->s_root = NULL;
1789                         goto error;
1790                 }
1791                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1792
1793                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1794                 set_sb_fs_state(rs, 0);
1795
1796                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1797                  * case, but older revisions can't. This will cause the
1798                  * file system to fail mount on those older implementations,
1799                  * avoiding corruption. -jeffm */
1800                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1801                     sb_bmap_nr(rs) != 0) {
1802                         reiserfs_warning(s, "super-2030", "This file system "
1803                                         "claims to use %u bitmap blocks in "
1804                                         "its super block, but requires %u. "
1805                                         "Clearing to zero.", sb_bmap_nr(rs),
1806                                         reiserfs_bmap_count(s));
1807
1808                         set_sb_bmap_nr(rs, 0);
1809                 }
1810
1811                 if (old_format_only(s)) {
1812                         /* filesystem of format 3.5 either with standard or non-standard
1813                            journal */
1814                         if (convert_reiserfs(s)) {
1815                                 /* and -o conv is given */
1816                                 if (!silent)
1817                                         reiserfs_info(s,
1818                                                       "converting 3.5 filesystem to the 3.6 format");
1819
1820                                 if (is_reiserfs_3_5(rs))
1821                                         /* put magic string of 3.6 format. 2.2 will not be able to
1822                                            mount this filesystem anymore */
1823                                         memcpy(rs->s_v1.s_magic,
1824                                                reiserfs_3_6_magic_string,
1825                                                sizeof
1826                                                (reiserfs_3_6_magic_string));
1827
1828                                 set_sb_version(rs, REISERFS_VERSION_2);
1829                                 reiserfs_convert_objectid_map_v1(s);
1830                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1831                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1832                         } else if (!silent) {
1833                                 reiserfs_info(s, "using 3.5.x disk format\n");
1834                         }
1835                 } else
1836                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1837
1838
1839                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1840                 errval = journal_end(&th, s, 1);
1841                 if (errval) {
1842                         dput(s->s_root);
1843                         s->s_root = NULL;
1844                         goto error;
1845                 }
1846
1847                 if ((errval = reiserfs_lookup_privroot(s)) ||
1848                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1849                         dput(s->s_root);
1850                         s->s_root = NULL;
1851                         goto error;
1852                 }
1853
1854                 /* look for files which were to be removed in previous session */
1855                 finish_unfinished(s);
1856         } else {
1857                 if (old_format_only(s) && !silent) {
1858                         reiserfs_info(s, "using 3.5.x disk format\n");
1859                 }
1860
1861                 if ((errval = reiserfs_lookup_privroot(s)) ||
1862                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1863                         dput(s->s_root);
1864                         s->s_root = NULL;
1865                         goto error;
1866                 }
1867         }
1868         // mark hash in super block: it could be unset. overwrite should be ok
1869         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1870
1871         handle_attrs(s);
1872
1873         reiserfs_proc_info_init(s);
1874
1875         init_waitqueue_head(&(sbi->s_wait));
1876         spin_lock_init(&sbi->bitmap_lock);
1877
1878         reiserfs_write_unlock(s);
1879
1880         return (0);
1881
1882 error:
1883         reiserfs_write_unlock(s);
1884 error_alloc:
1885         if (jinit_done) {       /* kill the commit thread, free journal ram */
1886                 journal_release_error(NULL, s);
1887         }
1888
1889         reiserfs_free_bitmap_cache(s);
1890         if (SB_BUFFER_WITH_SB(s))
1891                 brelse(SB_BUFFER_WITH_SB(s));
1892 #ifdef CONFIG_QUOTA
1893         {
1894                 int j;
1895                 for (j = 0; j < MAXQUOTAS; j++)
1896                         kfree(qf_names[j]);
1897         }
1898 #endif
1899         kfree(sbi);
1900
1901         s->s_fs_info = NULL;
1902         return errval;
1903 }
1904
1905 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1906 {
1907         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1908
1909         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1910         buf->f_bfree = sb_free_blocks(rs);
1911         buf->f_bavail = buf->f_bfree;
1912         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1913         buf->f_bsize = dentry->d_sb->s_blocksize;
1914         /* changed to accommodate gcc folks. */
1915         buf->f_type = REISERFS_SUPER_MAGIC;
1916         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1917         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1918                                 sizeof(rs->s_uuid)/2);
1919
1920         return 0;
1921 }
1922
1923 #ifdef CONFIG_QUOTA
1924 static int reiserfs_write_dquot(struct dquot *dquot)
1925 {
1926         struct reiserfs_transaction_handle th;
1927         int ret, err;
1928
1929         reiserfs_write_lock(dquot->dq_sb);
1930         ret =
1931             journal_begin(&th, dquot->dq_sb,
1932                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1933         if (ret)
1934                 goto out;
1935         ret = dquot_commit(dquot);
1936         err =
1937             journal_end(&th, dquot->dq_sb,
1938                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1939         if (!ret && err)
1940                 ret = err;
1941       out:
1942         reiserfs_write_unlock(dquot->dq_sb);
1943         return ret;
1944 }
1945
1946 static int reiserfs_acquire_dquot(struct dquot *dquot)
1947 {
1948         struct reiserfs_transaction_handle th;
1949         int ret, err;
1950
1951         reiserfs_write_lock(dquot->dq_sb);
1952         ret =
1953             journal_begin(&th, dquot->dq_sb,
1954                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1955         if (ret)
1956                 goto out;
1957         ret = dquot_acquire(dquot);
1958         err =
1959             journal_end(&th, dquot->dq_sb,
1960                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1961         if (!ret && err)
1962                 ret = err;
1963       out:
1964         reiserfs_write_unlock(dquot->dq_sb);
1965         return ret;
1966 }
1967
1968 static int reiserfs_release_dquot(struct dquot *dquot)
1969 {
1970         struct reiserfs_transaction_handle th;
1971         int ret, err;
1972
1973         reiserfs_write_lock(dquot->dq_sb);
1974         ret =
1975             journal_begin(&th, dquot->dq_sb,
1976                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1977         if (ret) {
1978                 /* Release dquot anyway to avoid endless cycle in dqput() */
1979                 dquot_release(dquot);
1980                 goto out;
1981         }
1982         ret = dquot_release(dquot);
1983         err =
1984             journal_end(&th, dquot->dq_sb,
1985                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1986         if (!ret && err)
1987                 ret = err;
1988       out:
1989         reiserfs_write_unlock(dquot->dq_sb);
1990         return ret;
1991 }
1992
1993 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1994 {
1995         /* Are we journaling quotas? */
1996         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1997             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1998                 dquot_mark_dquot_dirty(dquot);
1999                 return reiserfs_write_dquot(dquot);
2000         } else
2001                 return dquot_mark_dquot_dirty(dquot);
2002 }
2003
2004 static int reiserfs_write_info(struct super_block *sb, int type)
2005 {
2006         struct reiserfs_transaction_handle th;
2007         int ret, err;
2008
2009         /* Data block + inode block */
2010         reiserfs_write_lock(sb);
2011         ret = journal_begin(&th, sb, 2);
2012         if (ret)
2013                 goto out;
2014         ret = dquot_commit_info(sb, type);
2015         err = journal_end(&th, sb, 2);
2016         if (!ret && err)
2017                 ret = err;
2018       out:
2019         reiserfs_write_unlock(sb);
2020         return ret;
2021 }
2022
2023 /*
2024  * Turn on quotas during mount time - we need to find the quota file and such...
2025  */
2026 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2027 {
2028         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2029                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2030 }
2031
2032 /*
2033  * Standard function to be called on quota_on
2034  */
2035 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2036                              char *name, int remount)
2037 {
2038         int err;
2039         struct path path;
2040         struct inode *inode;
2041         struct reiserfs_transaction_handle th;
2042
2043         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2044                 return -EINVAL;
2045         /* No more checks needed? Path and format_id are bogus anyway... */
2046         if (remount)
2047                 return vfs_quota_on(sb, type, format_id, name, 1);
2048         err = kern_path(name, LOOKUP_FOLLOW, &path);
2049         if (err)
2050                 return err;
2051         /* Quotafile not on the same filesystem? */
2052         if (path.mnt->mnt_sb != sb) {
2053                 err = -EXDEV;
2054                 goto out;
2055         }
2056         inode = path.dentry->d_inode;
2057         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2058         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2059                 err = reiserfs_unpack(inode, NULL);
2060                 if (err) {
2061                         reiserfs_warning(sb, "super-6520",
2062                                 "Unpacking tail of quota file failed"
2063                                 " (%d). Cannot turn on quotas.", err);
2064                         err = -EINVAL;
2065                         goto out;
2066                 }
2067                 mark_inode_dirty(inode);
2068         }
2069         /* Journaling quota? */
2070         if (REISERFS_SB(sb)->s_qf_names[type]) {
2071                 /* Quotafile not of fs root? */
2072                 if (path.dentry->d_parent != sb->s_root)
2073                         reiserfs_warning(sb, "super-6521",
2074                                  "Quota file not on filesystem root. "
2075                                  "Journalled quota will not work.");
2076         }
2077
2078         /*
2079          * When we journal data on quota file, we have to flush journal to see
2080          * all updates to the file when we bypass pagecache...
2081          */
2082         if (reiserfs_file_data_log(inode)) {
2083                 /* Just start temporary transaction and finish it */
2084                 err = journal_begin(&th, sb, 1);
2085                 if (err)
2086                         goto out;
2087                 err = journal_end_sync(&th, sb, 1);
2088                 if (err)
2089                         goto out;
2090         }
2091         err = vfs_quota_on_path(sb, type, format_id, &path);
2092 out:
2093         path_put(&path);
2094         return err;
2095 }
2096
2097 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2098  * acquiring the locks... As quota files are never truncated and quota code
2099  * itself serializes the operations (and noone else should touch the files)
2100  * we don't have to be afraid of races */
2101 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2102                                    size_t len, loff_t off)
2103 {
2104         struct inode *inode = sb_dqopt(sb)->files[type];
2105         unsigned long blk = off >> sb->s_blocksize_bits;
2106         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2107         size_t toread;
2108         struct buffer_head tmp_bh, *bh;
2109         loff_t i_size = i_size_read(inode);
2110
2111         if (off > i_size)
2112                 return 0;
2113         if (off + len > i_size)
2114                 len = i_size - off;
2115         toread = len;
2116         while (toread > 0) {
2117                 tocopy =
2118                     sb->s_blocksize - offset <
2119                     toread ? sb->s_blocksize - offset : toread;
2120                 tmp_bh.b_state = 0;
2121                 /* Quota files are without tails so we can safely use this function */
2122                 reiserfs_write_lock(sb);
2123                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2124                 reiserfs_write_unlock(sb);
2125                 if (err)
2126                         return err;
2127                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2128                         memset(data, 0, tocopy);
2129                 else {
2130                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2131                         if (!bh)
2132                                 return -EIO;
2133                         memcpy(data, bh->b_data + offset, tocopy);
2134                         brelse(bh);
2135                 }
2136                 offset = 0;
2137                 toread -= tocopy;
2138                 data += tocopy;
2139                 blk++;
2140         }
2141         return len;
2142 }
2143
2144 /* Write to quotafile (we know the transaction is already started and has
2145  * enough credits) */
2146 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2147                                     const char *data, size_t len, loff_t off)
2148 {
2149         struct inode *inode = sb_dqopt(sb)->files[type];
2150         unsigned long blk = off >> sb->s_blocksize_bits;
2151         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2152         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2153         size_t towrite = len;
2154         struct buffer_head tmp_bh, *bh;
2155
2156         if (!current->journal_info) {
2157                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2158                         " cancelled because transaction is not started.\n",
2159                         (unsigned long long)off, (unsigned long long)len);
2160                 return -EIO;
2161         }
2162         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2163         while (towrite > 0) {
2164                 tocopy = sb->s_blocksize - offset < towrite ?
2165                     sb->s_blocksize - offset : towrite;
2166                 tmp_bh.b_state = 0;
2167                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2168                 if (err)
2169                         goto out;
2170                 if (offset || tocopy != sb->s_blocksize)
2171                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2172                 else
2173                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2174                 if (!bh) {
2175                         err = -EIO;
2176                         goto out;
2177                 }
2178                 lock_buffer(bh);
2179                 memcpy(bh->b_data + offset, data, tocopy);
2180                 flush_dcache_page(bh->b_page);
2181                 set_buffer_uptodate(bh);
2182                 unlock_buffer(bh);
2183                 reiserfs_prepare_for_journal(sb, bh, 1);
2184                 journal_mark_dirty(current->journal_info, sb, bh);
2185                 if (!journal_quota)
2186                         reiserfs_add_ordered_list(inode, bh);
2187                 brelse(bh);
2188                 offset = 0;
2189                 towrite -= tocopy;
2190                 data += tocopy;
2191                 blk++;
2192         }
2193 out:
2194         if (len == towrite) {
2195                 mutex_unlock(&inode->i_mutex);
2196                 return err;
2197         }
2198         if (inode->i_size < off + len - towrite)
2199                 i_size_write(inode, off + len - towrite);
2200         inode->i_version++;
2201         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2202         mark_inode_dirty(inode);
2203         mutex_unlock(&inode->i_mutex);
2204         return len - towrite;
2205 }
2206
2207 #endif
2208
2209 static int get_super_block(struct file_system_type *fs_type,
2210                            int flags, const char *dev_name,
2211                            void *data, struct vfsmount *mnt)
2212 {
2213         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2214                            mnt);
2215 }
2216
2217 static int __init init_reiserfs_fs(void)
2218 {
2219         int ret;
2220
2221         if ((ret = init_inodecache())) {
2222                 return ret;
2223         }
2224
2225         reiserfs_proc_info_global_init();
2226
2227         ret = register_filesystem(&reiserfs_fs_type);
2228
2229         if (ret == 0) {
2230                 return 0;
2231         }
2232
2233         reiserfs_proc_info_global_done();
2234         destroy_inodecache();
2235
2236         return ret;
2237 }
2238
2239 static void __exit exit_reiserfs_fs(void)
2240 {
2241         reiserfs_proc_info_global_done();
2242         unregister_filesystem(&reiserfs_fs_type);
2243         destroy_inodecache();
2244 }
2245
2246 struct file_system_type reiserfs_fs_type = {
2247         .owner = THIS_MODULE,
2248         .name = "reiserfs",
2249         .get_sb = get_super_block,
2250         .kill_sb = reiserfs_kill_sb,
2251         .fs_flags = FS_REQUIRES_DEV,
2252 };
2253
2254 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2255 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2256 MODULE_LICENSE("GPL");
2257
2258 module_init(init_reiserfs_fs);
2259 module_exit(exit_reiserfs_fs);