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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                 dquot_initialize(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         dquot_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         .write_dquot = reiserfs_write_dquot,
 626         .acquire_dquot = reiserfs_acquire_dquot,
 627         .release_dquot = reiserfs_release_dquot,
 628         .mark_dirty = reiserfs_mark_dquot_dirty,
 629         .write_info = reiserfs_write_info,
 630         .alloc_dquot    = dquot_alloc,
 631         .destroy_dquot  = dquot_destroy,
 632 };
 633
 634 static const struct quotactl_ops reiserfs_qctl_operations = {
 635         .quota_on = reiserfs_quota_on,
 636         .quota_off = vfs_quota_off,
 637         .quota_sync = vfs_quota_sync,
 638         .get_info = vfs_get_dqinfo,
 639         .set_info = vfs_set_dqinfo,
 640         .get_dqblk = vfs_get_dqblk,
 641         .set_dqblk = vfs_set_dqblk,
 642 };
 643 #endif
 644
 645 static const struct export_operations reiserfs_export_ops = {
 646         .encode_fh = reiserfs_encode_fh,
 647         .fh_to_dentry = reiserfs_fh_to_dentry,
 648         .fh_to_parent = reiserfs_fh_to_parent,
 649         .get_parent = reiserfs_get_parent,
 650 };
 651
 652 /* this struct is used in reiserfs_getopt () for containing the value for those
 653    mount options that have values rather than being toggles. */
 654 typedef struct {
 655         char *value;
 656         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 657                                    value is found, 0 is no bits are to be changed. */
 658         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 659                                    value is found, 0 is no bits are to be changed. This is
 660                                    applied BEFORE setmask */
 661 } arg_desc_t;
 662
 663 /* Set this bit in arg_required to allow empty arguments */
 664 #define REISERFS_OPT_ALLOWEMPTY 31
 665
 666 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 667    mount options */
 668 typedef struct {
 669         char *option_name;
 670         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 671         const arg_desc_t *values;       /* list of values accepted by an option */
 672         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 673                                    value is found, 0 is no bits are to be changed. */
 674         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 675                                    value is found, 0 is no bits are to be changed. This is
 676                                    applied BEFORE setmask */
 677 } opt_desc_t;
 678
 679 /* possible values for -o data= */
 680 static const arg_desc_t logging_mode[] = {
 681         {"ordered", 1 << REISERFS_DATA_ORDERED,
 682          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 683         {"journal", 1 << REISERFS_DATA_LOG,
 684          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 685         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 686          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 687         {.value = NULL}
 688 };
 689
 690 /* possible values for -o barrier= */
 691 static const arg_desc_t barrier_mode[] = {
 692         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 693         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 694         {.value = NULL}
 695 };
 696
 697 /* possible values for "-o block-allocator=" and bits which are to be set in
 698    s_mount_opt of reiserfs specific part of in-core super block */
 699 static const arg_desc_t balloc[] = {
 700         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 701         {"border", 0, 1 << REISERFS_NO_BORDER},
 702         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 703         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 704         {"test4", 1 << REISERFS_TEST4, 0},
 705         {"notest4", 0, 1 << REISERFS_TEST4},
 706         {NULL, 0, 0}
 707 };
 708
 709 static const arg_desc_t tails[] = {
 710         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 711         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 712         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 713         {NULL, 0, 0}
 714 };
 715
 716 static const arg_desc_t error_actions[] = {
 717         {"panic", 1 << REISERFS_ERROR_PANIC,
 718          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 719         {"ro-remount", 1 << REISERFS_ERROR_RO,
 720          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 721 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 722         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 723          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 724 #endif
 725         {NULL, 0, 0},
 726 };
 727
 728 /* proceed only one option from a list *cur - string containing of mount options
 729    opts - array of options which are accepted
 730    opt_arg - if option is found and requires an argument and if it is specifed
 731    in the input - pointer to the argument is stored here
 732    bit_flags - if option requires to set a certain bit - it is set here
 733    return -1 if unknown option is found, opt->arg_required otherwise */
 734 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 735                            char **opt_arg, unsigned long *bit_flags)
 736 {
 737         char *p;
 738         /* foo=bar,
 739            ^   ^  ^
 740            |   |  +-- option_end
 741            |   +-- arg_start
 742            +-- option_start
 743          */
 744         const opt_desc_t *opt;
 745         const arg_desc_t *arg;
 746
 747         p = *cur;
 748
 749         /* assume argument cannot contain commas */
 750         *cur = strchr(p, ',');
 751         if (*cur) {
 752                 *(*cur) = '\0';
 753                 (*cur)++;
 754         }
 755
 756         if (!strncmp(p, "alloc=", 6)) {
 757                 /* Ugly special case, probably we should redo options parser so that
 758                    it can understand several arguments for some options, also so that
 759                    it can fill several bitfields with option values. */
 760                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 761                         return -1;
 762                 } else {
 763                         return 0;
 764                 }
 765         }
 766
 767         /* for every option in the list */
 768         for (opt = opts; opt->option_name; opt++) {
 769                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 770                         if (bit_flags) {
 771                                 if (opt->clrmask ==
 772                                     (1 << REISERFS_UNSUPPORTED_OPT))
 773                                         reiserfs_warning(s, "super-6500",
 774                                                          "%s not supported.\n",
 775                                                          p);
 776                                 else
 777                                         *bit_flags &= ~opt->clrmask;
 778                                 if (opt->setmask ==
 779                                     (1 << REISERFS_UNSUPPORTED_OPT))
 780                                         reiserfs_warning(s, "super-6501",
 781                                                          "%s not supported.\n",
 782                                                          p);
 783                                 else
 784                                         *bit_flags |= opt->setmask;
 785                         }
 786                         break;
 787                 }
 788         }
 789         if (!opt->option_name) {
 790                 reiserfs_warning(s, "super-6502",
 791                                  "unknown mount option \"%s\"", p);
 792                 return -1;
 793         }
 794
 795         p += strlen(opt->option_name);
 796         switch (*p) {
 797         case '=':
 798                 if (!opt->arg_required) {
 799                         reiserfs_warning(s, "super-6503",
 800                                          "the option \"%s\" does not "
 801                                          "require an argument\n",
 802                                          opt->option_name);
 803                         return -1;
 804                 }
 805                 break;
 806
 807         case 0:
 808                 if (opt->arg_required) {
 809                         reiserfs_warning(s, "super-6504",
 810                                          "the option \"%s\" requires an "
 811                                          "argument\n", opt->option_name);
 812                         return -1;
 813                 }
 814                 break;
 815         default:
 816                 reiserfs_warning(s, "super-6505",
 817                                  "head of option \"%s\" is only correct\n",
 818                                  opt->option_name);
 819                 return -1;
 820         }
 821
 822         /* move to the argument, or to next option if argument is not required */
 823         p++;
 824
 825         if (opt->arg_required
 826             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 827             && !strlen(p)) {
 828                 /* this catches "option=," if not allowed */
 829                 reiserfs_warning(s, "super-6506",
 830                                  "empty argument for \"%s\"\n",
 831                                  opt->option_name);
 832                 return -1;
 833         }
 834
 835         if (!opt->values) {
 836                 /* *=NULLopt_arg contains pointer to argument */
 837                 *opt_arg = p;
 838                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 839         }
 840
 841         /* values possible for this option are listed in opt->values */
 842         for (arg = opt->values; arg->value; arg++) {
 843                 if (!strcmp(p, arg->value)) {
 844                         if (bit_flags) {
 845                                 *bit_flags &= ~arg->clrmask;
 846                                 *bit_flags |= arg->setmask;
 847                         }
 848                         return opt->arg_required;
 849                 }
 850         }
 851
 852         reiserfs_warning(s, "super-6506",
 853                          "bad value \"%s\" for option \"%s\"\n", p,
 854                          opt->option_name);
 855         return -1;
 856 }
 857
 858 /* returns 0 if something is wrong in option string, 1 - otherwise */
 859 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 860                                   unsigned long *mount_options,
 861                                   /* after the parsing phase, contains the
 862                                      collection of bitflags defining what
 863                                      mount options were selected. */
 864                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 865                                   char **jdev_name,
 866                                   unsigned int *commit_max_age,
 867                                   char **qf_names,
 868                                   unsigned int *qfmt)
 869 {
 870         int c;
 871         char *arg = NULL;
 872         char *pos;
 873         opt_desc_t opts[] = {
 874                 /* Compatibility stuff, so that -o notail for old setups still work */
 875                 {"tails",.arg_required = 't',.values = tails},
 876                 {"notail",.clrmask =
 877                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 878                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 879                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 880                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 881                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 882 #ifdef CONFIG_REISERFS_FS_XATTR
 883                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 884                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 885 #else
 886                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 887                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 888 #endif
 889 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 890                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 891                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 892 #else
 893                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 894                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 895 #endif
 896                 {.option_name = "nolog"},
 897                 {"replayonly",.setmask = 1 << REPLAYONLY},
 898                 {"block-allocator",.arg_required = 'a',.values = balloc},
 899                 {"data",.arg_required = 'd',.values = logging_mode},
 900                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 901                 {"resize",.arg_required = 'r',.values = NULL},
 902                 {"jdev",.arg_required = 'j',.values = NULL},
 903                 {"nolargeio",.arg_required = 'w',.values = NULL},
 904                 {"commit",.arg_required = 'c',.values = NULL},
 905                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 906                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 907                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 908                 {"errors",.arg_required = 'e',.values = error_actions},
 909                 {"usrjquota",.arg_required =
 910                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 911                 {"grpjquota",.arg_required =
 912                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 913                 {"jqfmt",.arg_required = 'f',.values = NULL},
 914                 {.option_name = NULL}
 915         };
 916
 917         *blocks = 0;
 918         if (!options || !*options)
 919                 /* use default configuration: create tails, journaling on, no
 920                    conversion to newest format */
 921                 return 1;
 922
 923         for (pos = options; pos;) {
 924                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 925                 if (c == -1)
 926                         /* wrong option is given */
 927                         return 0;
 928
 929                 if (c == 'r') {
 930                         char *p;
 931
 932                         p = NULL;
 933                         /* "resize=NNN" or "resize=auto" */
 934
 935                         if (!strcmp(arg, "auto")) {
 936                                 /* From JFS code, to auto-get the size. */
 937                                 *blocks =
 938                                     s->s_bdev->bd_inode->i_size >> s->
 939                                     s_blocksize_bits;
 940                         } else {
 941                                 *blocks = simple_strtoul(arg, &p, 0);
 942                                 if (*p != '\0') {
 943                                         /* NNN does not look like a number */
 944                                         reiserfs_warning(s, "super-6507",
 945                                                          "bad value %s for "
 946                                                          "-oresize\n", arg);
 947                                         return 0;
 948                                 }
 949                         }
 950                 }
 951
 952                 if (c == 'c') {
 953                         char *p = NULL;
 954                         unsigned long val = simple_strtoul(arg, &p, 0);
 955                         /* commit=NNN (time in seconds) */
 956                         if (*p != '\0' || val >= (unsigned int)-1) {
 957                                 reiserfs_warning(s, "super-6508",
 958                                                  "bad value %s for -ocommit\n",
 959                                                  arg);
 960                                 return 0;
 961                         }
 962                         *commit_max_age = (unsigned int)val;
 963                 }
 964
 965                 if (c == 'w') {
 966                         reiserfs_warning(s, "super-6509", "nolargeio option "
 967                                          "is no longer supported");
 968                         return 0;
 969                 }
 970
 971                 if (c == 'j') {
 972                         if (arg && *arg && jdev_name) {
 973                                 if (*jdev_name) {       //Hm, already assigned?
 974                                         reiserfs_warning(s, "super-6510",
 975                                                          "journal device was "
 976                                                          "already specified to "
 977                                                          "be %s", *jdev_name);
 978                                         return 0;
 979                                 }
 980                                 *jdev_name = arg;
 981                         }
 982                 }
 983 #ifdef CONFIG_QUOTA
 984                 if (c == 'u' || c == 'g') {
 985                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
 986
 987                         if (sb_any_quota_loaded(s) &&
 988                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
 989                                 reiserfs_warning(s, "super-6511",
 990                                                  "cannot change journaled "
 991                                                  "quota options when quota "
 992                                                  "turned on.");
 993                                 return 0;
 994                         }
 995                         if (*arg) {     /* Some filename specified? */
 996                                 if (REISERFS_SB(s)->s_qf_names[qtype]
 997                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
 998                                               arg)) {
 999                                         reiserfs_warning(s, "super-6512",
1000                                                          "%s quota file "
1001                                                          "already specified.",
1002                                                          QTYPE2NAME(qtype));
1003                                         return 0;
1004                                 }
1005                                 if (strchr(arg, '/')) {
1006                                         reiserfs_warning(s, "super-6513",
1007                                                          "quotafile must be "
1008                                                          "on filesystem root.");
1009                                         return 0;
1010                                 }
1011                                 qf_names[qtype] =
1012                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1013                                 if (!qf_names[qtype]) {
1014                                         reiserfs_warning(s, "reiserfs-2502",
1015                                                          "not enough memory "
1016                                                          "for storing "
1017                                                          "quotafile name.");
1018                                         return 0;
1019                                 }
1020                                 strcpy(qf_names[qtype], arg);
1021                                 *mount_options |= 1 << REISERFS_QUOTA;
1022                         } else {
1023                                 if (qf_names[qtype] !=
1024                                     REISERFS_SB(s)->s_qf_names[qtype])
1025                                         kfree(qf_names[qtype]);
1026                                 qf_names[qtype] = NULL;
1027                         }
1028                 }
1029                 if (c == 'f') {
1030                         if (!strcmp(arg, "vfsold"))
1031                                 *qfmt = QFMT_VFS_OLD;
1032                         else if (!strcmp(arg, "vfsv0"))
1033                                 *qfmt = QFMT_VFS_V0;
1034                         else {
1035                                 reiserfs_warning(s, "super-6514",
1036                                                  "unknown quota format "
1037                                                  "specified.");
1038                                 return 0;
1039                         }
1040                         if (sb_any_quota_loaded(s) &&
1041                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1042                                 reiserfs_warning(s, "super-6515",
1043                                                  "cannot change journaled "
1044                                                  "quota options when quota "
1045                                                  "turned on.");
1046                                 return 0;
1047                         }
1048                 }
1049 #else
1050                 if (c == 'u' || c == 'g' || c == 'f') {
1051                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1052                                          "quota options not supported.");
1053                         return 0;
1054                 }
1055 #endif
1056         }
1057
1058 #ifdef CONFIG_QUOTA
1059         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1060             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1061                 reiserfs_warning(s, "super-6515",
1062                                  "journaled quota format not specified.");
1063                 return 0;
1064         }
1065         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1066         if (!(*mount_options & (1 << REISERFS_QUOTA))
1067             && sb_any_quota_loaded(s)) {
1068                 reiserfs_warning(s, "super-6516", "quota options must "
1069                                  "be present when quota is turned on.");
1070                 return 0;
1071         }
1072 #endif
1073
1074         return 1;
1075 }
1076
1077 static void switch_data_mode(struct super_block *s, unsigned long mode)
1078 {
1079         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1080                                          (1 << REISERFS_DATA_ORDERED) |
1081                                          (1 << REISERFS_DATA_WRITEBACK));
1082         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1083 }
1084
1085 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1086 {
1087         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1088                 if (!reiserfs_data_log(s)) {
1089                         switch_data_mode(s, REISERFS_DATA_LOG);
1090                         reiserfs_info(s, "switching to journaled data mode\n");
1091                 }
1092         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1093                 if (!reiserfs_data_ordered(s)) {
1094                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1095                         reiserfs_info(s, "switching to ordered data mode\n");
1096                 }
1097         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1098                 if (!reiserfs_data_writeback(s)) {
1099                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1100                         reiserfs_info(s, "switching to writeback data mode\n");
1101                 }
1102         }
1103 }
1104
1105 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1106 {
1107         int flush = (1 << REISERFS_BARRIER_FLUSH);
1108         int none = (1 << REISERFS_BARRIER_NONE);
1109         int all_barrier = flush | none;
1110
1111         if (bits & all_barrier) {
1112                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1113                 if (bits & flush) {
1114                         REISERFS_SB(s)->s_mount_opt |= flush;
1115                         printk("reiserfs: enabling write barrier flush mode\n");
1116                 } else if (bits & none) {
1117                         REISERFS_SB(s)->s_mount_opt |= none;
1118                         printk("reiserfs: write barriers turned off\n");
1119                 }
1120         }
1121 }
1122
1123 static void handle_attrs(struct super_block *s)
1124 {
1125         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1126
1127         if (reiserfs_attrs(s)) {
1128                 if (old_format_only(s)) {
1129                         reiserfs_warning(s, "super-6517", "cannot support "
1130                                          "attributes on 3.5.x disk format");
1131                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1132                         return;
1133                 }
1134                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1135                         reiserfs_warning(s, "super-6518", "cannot support "
1136                                          "attributes until flag is set in "
1137                                          "super-block");
1138                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1139                 }
1140         }
1141 }
1142
1143 #ifdef CONFIG_QUOTA
1144 static void handle_quota_files(struct super_block *s, char **qf_names,
1145                                unsigned int *qfmt)
1146 {
1147         int i;
1148
1149         for (i = 0; i < MAXQUOTAS; i++) {
1150                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1151                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1152                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1153         }
1154         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1155 }
1156 #endif
1157
1158 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1159 {
1160         struct reiserfs_super_block *rs;
1161         struct reiserfs_transaction_handle th;
1162         unsigned long blocks;
1163         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1164         unsigned long safe_mask = 0;
1165         unsigned int commit_max_age = (unsigned int)-1;
1166         struct reiserfs_journal *journal = SB_JOURNAL(s);
1167         char *new_opts = kstrdup(arg, GFP_KERNEL);
1168         int err;
1169         char *qf_names[MAXQUOTAS];
1170         unsigned int qfmt = 0;
1171 #ifdef CONFIG_QUOTA
1172         int i;
1173 #endif
1174
1175         reiserfs_write_lock(s);
1176
1177 #ifdef CONFIG_QUOTA
1178         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1179 #endif
1180
1181         rs = SB_DISK_SUPER_BLOCK(s);
1182
1183         if (!reiserfs_parse_options
1184             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1185             qf_names, &qfmt)) {
1186 #ifdef CONFIG_QUOTA
1187                 for (i = 0; i < MAXQUOTAS; i++)
1188                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1189                                 kfree(qf_names[i]);
1190 #endif
1191                 err = -EINVAL;
1192                 goto out_err;
1193         }
1194 #ifdef CONFIG_QUOTA
1195         handle_quota_files(s, qf_names, &qfmt);
1196 #endif
1197
1198         handle_attrs(s);
1199
1200         /* Add options that are safe here */
1201         safe_mask |= 1 << REISERFS_SMALLTAIL;
1202         safe_mask |= 1 << REISERFS_LARGETAIL;
1203         safe_mask |= 1 << REISERFS_NO_BORDER;
1204         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1205         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1206         safe_mask |= 1 << REISERFS_TEST4;
1207         safe_mask |= 1 << REISERFS_ATTRS;
1208         safe_mask |= 1 << REISERFS_XATTRS_USER;
1209         safe_mask |= 1 << REISERFS_POSIXACL;
1210         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1211         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1212         safe_mask |= 1 << REISERFS_ERROR_RO;
1213         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1214         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1215         safe_mask |= 1 << REISERFS_QUOTA;
1216
1217         /* Update the bitmask, taking care to keep
1218          * the bits we're not allowed to change here */
1219         REISERFS_SB(s)->s_mount_opt =
1220             (REISERFS_SB(s)->
1221              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1222
1223         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1224                 journal->j_max_commit_age = commit_max_age;
1225                 journal->j_max_trans_age = commit_max_age;
1226         } else if (commit_max_age == 0) {
1227                 /* 0 means restore defaults. */
1228                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1229                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1230         }
1231
1232         if (blocks) {
1233                 err = reiserfs_resize(s, blocks);
1234                 if (err != 0)
1235                         goto out_err;
1236         }
1237
1238         if (*mount_flags & MS_RDONLY) {
1239                 reiserfs_xattr_init(s, *mount_flags);
1240                 /* remount read-only */
1241                 if (s->s_flags & MS_RDONLY)
1242                         /* it is read-only already */
1243                         goto out_ok;
1244                 /* try to remount file system with read-only permissions */
1245                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1246                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1247                         goto out_ok;
1248                 }
1249
1250                 err = journal_begin(&th, s, 10);
1251                 if (err)
1252                         goto out_err;
1253
1254                 /* Mounting a rw partition read-only. */
1255                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1256                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1257                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1258         } else {
1259                 /* remount read-write */
1260                 if (!(s->s_flags & MS_RDONLY)) {
1261                         reiserfs_xattr_init(s, *mount_flags);
1262                         goto out_ok;    /* We are read-write already */
1263                 }
1264
1265                 if (reiserfs_is_journal_aborted(journal)) {
1266                         err = journal->j_errno;
1267                         goto out_err;
1268                 }
1269
1270                 handle_data_mode(s, mount_options);
1271                 handle_barrier_mode(s, mount_options);
1272                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1273                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1274                 err = journal_begin(&th, s, 10);
1275                 if (err)
1276                         goto out_err;
1277
1278                 /* Mount a partition which is read-only, read-write */
1279                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1280                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1281                 s->s_flags &= ~MS_RDONLY;
1282                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1283                 if (!old_format_only(s))
1284                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1285                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1286                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1287                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1288         }
1289         /* this will force a full flush of all journal lists */
1290         SB_JOURNAL(s)->j_must_wait = 1;
1291         err = journal_end(&th, s, 10);
1292         if (err)
1293                 goto out_err;
1294         s->s_dirt = 0;
1295
1296         if (!(*mount_flags & MS_RDONLY)) {
1297                 finish_unfinished(s);
1298                 reiserfs_xattr_init(s, *mount_flags);
1299         }
1300
1301 out_ok:
1302         replace_mount_options(s, new_opts);
1303         reiserfs_write_unlock(s);
1304         return 0;
1305
1306 out_err:
1307         kfree(new_opts);
1308         reiserfs_write_unlock(s);
1309         return err;
1310 }
1311
1312 static int read_super_block(struct super_block *s, int offset)
1313 {
1314         struct buffer_head *bh;
1315         struct reiserfs_super_block *rs;
1316         int fs_blocksize;
1317
1318         bh = sb_bread(s, offset / s->s_blocksize);
1319         if (!bh) {
1320                 reiserfs_warning(s, "sh-2006",
1321                                  "bread failed (dev %s, block %lu, size %lu)",
1322                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1323                                  s->s_blocksize);
1324                 return 1;
1325         }
1326
1327         rs = (struct reiserfs_super_block *)bh->b_data;
1328         if (!is_any_reiserfs_magic_string(rs)) {
1329                 brelse(bh);
1330                 return 1;
1331         }
1332         //
1333         // ok, reiserfs signature (old or new) found in at the given offset
1334         //
1335         fs_blocksize = sb_blocksize(rs);
1336         brelse(bh);
1337         sb_set_blocksize(s, fs_blocksize);
1338
1339         bh = sb_bread(s, offset / s->s_blocksize);
1340         if (!bh) {
1341                 reiserfs_warning(s, "sh-2007",
1342                                  "bread failed (dev %s, block %lu, size %lu)",
1343                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1344                                  s->s_blocksize);
1345                 return 1;
1346         }
1347
1348         rs = (struct reiserfs_super_block *)bh->b_data;
1349         if (sb_blocksize(rs) != s->s_blocksize) {
1350                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1351                                  "filesystem on (dev %s, block %Lu, size %lu)",
1352                                  reiserfs_bdevname(s),
1353                                  (unsigned long long)bh->b_blocknr,
1354                                  s->s_blocksize);
1355                 brelse(bh);
1356                 return 1;
1357         }
1358
1359         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1360                 brelse(bh);
1361                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1362                                  "--rebuild-tree run detected. Please run\n"
1363                                  "reiserfsck --rebuild-tree and wait for a "
1364                                  "completion. If that fails\n"
1365                                  "get newer reiserfsprogs package");
1366                 return 1;
1367         }
1368
1369         SB_BUFFER_WITH_SB(s) = bh;
1370         SB_DISK_SUPER_BLOCK(s) = rs;
1371
1372         if (is_reiserfs_jr(rs)) {
1373                 /* magic is of non-standard journal filesystem, look at s_version to
1374                    find which format is in use */
1375                 if (sb_version(rs) == REISERFS_VERSION_2)
1376                         reiserfs_info(s, "found reiserfs format \"3.6\""
1377                                       " with non-standard journal\n");
1378                 else if (sb_version(rs) == REISERFS_VERSION_1)
1379                         reiserfs_info(s, "found reiserfs format \"3.5\""
1380                                       " with non-standard journal\n");
1381                 else {
1382                         reiserfs_warning(s, "sh-2012", "found unknown "
1383                                          "format \"%u\" of reiserfs with "
1384                                          "non-standard magic", sb_version(rs));
1385                         return 1;
1386                 }
1387         } else
1388                 /* s_version of standard format may contain incorrect information,
1389                    so we just look at the magic string */
1390                 reiserfs_info(s,
1391                               "found reiserfs format \"%s\" with standard journal\n",
1392                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1393
1394         s->s_op = &reiserfs_sops;
1395         s->s_export_op = &reiserfs_export_ops;
1396 #ifdef CONFIG_QUOTA
1397         s->s_qcop = &reiserfs_qctl_operations;
1398         s->dq_op = &reiserfs_quota_operations;
1399 #endif
1400
1401         /* new format is limited by the 32 bit wide i_blocks field, want to
1402          ** be one full block below that.
1403          */
1404         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1405         return 0;
1406 }
1407
1408 /* after journal replay, reread all bitmap and super blocks */
1409 static int reread_meta_blocks(struct super_block *s)
1410 {
1411         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1412         reiserfs_write_unlock(s);
1413         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1414         reiserfs_write_lock(s);
1415         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1416                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1417                 return 1;
1418         }
1419
1420         return 0;
1421 }
1422
1423 /////////////////////////////////////////////////////
1424 // hash detection stuff
1425
1426 // if root directory is empty - we set default - Yura's - hash and
1427 // warn about it
1428 // FIXME: we look for only one name in a directory. If tea and yura
1429 // bith have the same value - we ask user to send report to the
1430 // mailing list
1431 static __u32 find_hash_out(struct super_block *s)
1432 {
1433         int retval;
1434         struct inode *inode;
1435         struct cpu_key key;
1436         INITIALIZE_PATH(path);
1437         struct reiserfs_dir_entry de;
1438         __u32 hash = DEFAULT_HASH;
1439
1440         inode = s->s_root->d_inode;
1441
1442         do {                    // Some serious "goto"-hater was there ;)
1443                 u32 teahash, r5hash, yurahash;
1444
1445                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1446                 retval = search_by_entry_key(s, &key, &path, &de);
1447                 if (retval == IO_ERROR) {
1448                         pathrelse(&path);
1449                         return UNSET_HASH;
1450                 }
1451                 if (retval == NAME_NOT_FOUND)
1452                         de.de_entry_num--;
1453                 set_de_name_and_namelen(&de);
1454                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1455                         /* allow override in this case */
1456                         if (reiserfs_rupasov_hash(s)) {
1457                                 hash = YURA_HASH;
1458                         }
1459                         reiserfs_info(s, "FS seems to be empty, autodetect "
1460                                          "is using the default hash\n");
1461                         break;
1462                 }
1463                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1464                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1465                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1466                 if (((teahash == r5hash)
1467                      &&
1468                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1469                       == r5hash)) || ((teahash == yurahash)
1470                                       && (yurahash ==
1471                                           GET_HASH_VALUE(deh_offset
1472                                                          (&
1473                                                           (de.
1474                                                            de_deh[de.
1475                                                                   de_entry_num])))))
1476                     || ((r5hash == yurahash)
1477                         && (yurahash ==
1478                             GET_HASH_VALUE(deh_offset
1479                                            (&(de.de_deh[de.de_entry_num])))))) {
1480                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1481                                          "automatically detect hash function. "
1482                                          "Please mount with -o "
1483                                          "hash={tea,rupasov,r5}");
1484                         hash = UNSET_HASH;
1485                         break;
1486                 }
1487                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1488                     yurahash)
1489                         hash = YURA_HASH;
1490                 else if (GET_HASH_VALUE
1491                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1492                         hash = TEA_HASH;
1493                 else if (GET_HASH_VALUE
1494                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1495                         hash = R5_HASH;
1496                 else {
1497                         reiserfs_warning(s, "reiserfs-2506",
1498                                          "Unrecognised hash function");
1499                         hash = UNSET_HASH;
1500                 }
1501         } while (0);
1502
1503         pathrelse(&path);
1504         return hash;
1505 }
1506
1507 // finds out which hash names are sorted with
1508 static int what_hash(struct super_block *s)
1509 {
1510         __u32 code;
1511
1512         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1513
1514         /* reiserfs_hash_detect() == true if any of the hash mount options
1515          ** were used.  We must check them to make sure the user isn't
1516          ** using a bad hash value
1517          */
1518         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1519                 code = find_hash_out(s);
1520
1521         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1522                 /* detection has found the hash, and we must check against the
1523                  ** mount options
1524                  */
1525                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1526                         reiserfs_warning(s, "reiserfs-2507",
1527                                          "Error, %s hash detected, "
1528                                          "unable to force rupasov hash",
1529                                          reiserfs_hashname(code));
1530                         code = UNSET_HASH;
1531                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1532                         reiserfs_warning(s, "reiserfs-2508",
1533                                          "Error, %s hash detected, "
1534                                          "unable to force tea hash",
1535                                          reiserfs_hashname(code));
1536                         code = UNSET_HASH;
1537                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1538                         reiserfs_warning(s, "reiserfs-2509",
1539                                          "Error, %s hash detected, "
1540                                          "unable to force r5 hash",
1541                                          reiserfs_hashname(code));
1542                         code = UNSET_HASH;
1543                 }
1544         } else {
1545                 /* find_hash_out was not called or could not determine the hash */
1546                 if (reiserfs_rupasov_hash(s)) {
1547                         code = YURA_HASH;
1548                 } else if (reiserfs_tea_hash(s)) {
1549                         code = TEA_HASH;
1550                 } else if (reiserfs_r5_hash(s)) {
1551                         code = R5_HASH;
1552                 }
1553         }
1554
1555         /* if we are mounted RW, and we have a new valid hash code, update
1556          ** the super
1557          */
1558         if (code != UNSET_HASH &&
1559             !(s->s_flags & MS_RDONLY) &&
1560             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1561                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1562         }
1563         return code;
1564 }
1565
1566 // return pointer to appropriate function
1567 static hashf_t hash_function(struct super_block *s)
1568 {
1569         switch (what_hash(s)) {
1570         case TEA_HASH:
1571                 reiserfs_info(s, "Using tea hash to sort names\n");
1572                 return keyed_hash;
1573         case YURA_HASH:
1574                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1575                 return yura_hash;
1576         case R5_HASH:
1577                 reiserfs_info(s, "Using r5 hash to sort names\n");
1578                 return r5_hash;
1579         }
1580         return NULL;
1581 }
1582
1583 // this is used to set up correct value for old partitions
1584 static int function2code(hashf_t func)
1585 {
1586         if (func == keyed_hash)
1587                 return TEA_HASH;
1588         if (func == yura_hash)
1589                 return YURA_HASH;
1590         if (func == r5_hash)
1591                 return R5_HASH;
1592
1593         BUG();                  // should never happen
1594
1595         return 0;
1596 }
1597
1598 #define SWARN(silent, s, id, ...)                       \
1599         if (!(silent))                          \
1600                 reiserfs_warning(s, id, __VA_ARGS__)
1601
1602 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1603 {
1604         struct inode *root_inode;
1605         struct reiserfs_transaction_handle th;
1606         int old_format = 0;
1607         unsigned long blocks;
1608         unsigned int commit_max_age = 0;
1609         int jinit_done = 0;
1610         struct reiserfs_iget_args args;
1611         struct reiserfs_super_block *rs;
1612         char *jdev_name;
1613         struct reiserfs_sb_info *sbi;
1614         int errval = -EINVAL;
1615         char *qf_names[MAXQUOTAS] = {};
1616         unsigned int qfmt = 0;
1617
1618         save_mount_options(s, data);
1619
1620         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1621         if (!sbi)
1622                 return -ENOMEM;
1623         s->s_fs_info = sbi;
1624         /* Set default values for options: non-aggressive tails, RO on errors */
1625         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1626         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1627         /* no preallocation minimum, be smart in
1628            reiserfs_file_write instead */
1629         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1630         /* Preallocate by 16 blocks (17-1) at once */
1631         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1632         /* setup default block allocator options */
1633         reiserfs_init_alloc_options(s);
1634
1635         mutex_init(&REISERFS_SB(s)->lock);
1636         REISERFS_SB(s)->lock_depth = -1;
1637
1638         /*
1639          * This function is called with the bkl, which also was the old
1640          * locking used here.
1641          * do_journal_begin() will soon check if we hold the lock (ie: was the
1642          * bkl). This is likely because do_journal_begin() has several another
1643          * callers because at this time, it doesn't seem to be necessary to
1644          * protect against anything.
1645          * Anyway, let's be conservative and lock for now.
1646          */
1647         reiserfs_write_lock(s);
1648
1649         jdev_name = NULL;
1650         if (reiserfs_parse_options
1651             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1652              &commit_max_age, qf_names, &qfmt) == 0) {
1653                 goto error;
1654         }
1655 #ifdef CONFIG_QUOTA
1656         handle_quota_files(s, qf_names, &qfmt);
1657 #endif
1658
1659         if (blocks) {
1660                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1661                 goto error;
1662         }
1663
1664         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1665         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1666                 old_format = 1;
1667         /* try new format (64-th 1k block), which can contain reiserfs super block */
1668         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1669                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1670                       reiserfs_bdevname(s));
1671                 goto error;
1672         }
1673
1674         rs = SB_DISK_SUPER_BLOCK(s);
1675         /* Let's do basic sanity check to verify that underlying device is not
1676            smaller than the filesystem. If the check fails then abort and scream,
1677            because bad stuff will happen otherwise. */
1678         if (s->s_bdev && s->s_bdev->bd_inode
1679             && i_size_read(s->s_bdev->bd_inode) <
1680             sb_block_count(rs) * sb_blocksize(rs)) {
1681                 SWARN(silent, s, "", "Filesystem cannot be "
1682                       "mounted because it is bigger than the device");
1683                 SWARN(silent, s, "", "You may need to run fsck "
1684                       "or increase size of your LVM partition");
1685                 SWARN(silent, s, "", "Or may be you forgot to "
1686                       "reboot after fdisk when it told you to");
1687                 goto error;
1688         }
1689
1690         sbi->s_mount_state = SB_REISERFS_STATE(s);
1691         sbi->s_mount_state = REISERFS_VALID_FS;
1692
1693         if ((errval = reiserfs_init_bitmap_cache(s))) {
1694                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1695                 goto error;
1696         }
1697         errval = -EINVAL;
1698 #ifdef CONFIG_REISERFS_CHECK
1699         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1700         SWARN(silent, s, "", "- it is slow mode for debugging.");
1701 #endif
1702
1703         /* make data=ordered the default */
1704         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1705             !reiserfs_data_writeback(s)) {
1706                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1707         }
1708
1709         if (reiserfs_data_log(s)) {
1710                 reiserfs_info(s, "using journaled data mode\n");
1711         } else if (reiserfs_data_ordered(s)) {
1712                 reiserfs_info(s, "using ordered data mode\n");
1713         } else {
1714                 reiserfs_info(s, "using writeback data mode\n");
1715         }
1716         if (reiserfs_barrier_flush(s)) {
1717                 printk("reiserfs: using flush barriers\n");
1718         }
1719         // set_device_ro(s->s_dev, 1) ;
1720         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1721                 SWARN(silent, s, "sh-2022",
1722                       "unable to initialize journal space");
1723                 goto error;
1724         } else {
1725                 jinit_done = 1; /* once this is set, journal_release must be called
1726                                  ** if we error out of the mount
1727                                  */
1728         }
1729         if (reread_meta_blocks(s)) {
1730                 SWARN(silent, s, "jmacd-9",
1731                       "unable to reread meta blocks after journal init");
1732                 goto error;
1733         }
1734
1735         if (replay_only(s))
1736                 goto error;
1737
1738         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1739                 SWARN(silent, s, "clm-7000",
1740                       "Detected readonly device, marking FS readonly");
1741                 s->s_flags |= MS_RDONLY;
1742         }
1743         args.objectid = REISERFS_ROOT_OBJECTID;
1744         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1745         root_inode =
1746             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1747                          reiserfs_init_locked_inode, (void *)(&args));
1748         if (!root_inode) {
1749                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1750                 goto error;
1751         }
1752
1753         if (root_inode->i_state & I_NEW) {
1754                 reiserfs_read_locked_inode(root_inode, &args);
1755                 unlock_new_inode(root_inode);
1756         }
1757
1758         s->s_root = d_alloc_root(root_inode);
1759         if (!s->s_root) {
1760                 iput(root_inode);
1761                 goto error;
1762         }
1763         // define and initialize hash function
1764         sbi->s_hash_function = hash_function(s);
1765         if (sbi->s_hash_function == NULL) {
1766                 dput(s->s_root);
1767                 s->s_root = NULL;
1768                 goto error;
1769         }
1770
1771         if (is_reiserfs_3_5(rs)
1772             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1773                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1774         else if (old_format)
1775                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1776         else
1777                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1778
1779         if (!(s->s_flags & MS_RDONLY)) {
1780
1781                 errval = journal_begin(&th, s, 1);
1782                 if (errval) {
1783                         dput(s->s_root);
1784                         s->s_root = NULL;
1785                         goto error;
1786                 }
1787                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1788
1789                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1790                 set_sb_fs_state(rs, 0);
1791
1792                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1793                  * case, but older revisions can't. This will cause the
1794                  * file system to fail mount on those older implementations,
1795                  * avoiding corruption. -jeffm */
1796                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1797                     sb_bmap_nr(rs) != 0) {
1798                         reiserfs_warning(s, "super-2030", "This file system "
1799                                         "claims to use %u bitmap blocks in "
1800                                         "its super block, but requires %u. "
1801                                         "Clearing to zero.", sb_bmap_nr(rs),
1802                                         reiserfs_bmap_count(s));
1803
1804                         set_sb_bmap_nr(rs, 0);
1805                 }
1806
1807                 if (old_format_only(s)) {
1808                         /* filesystem of format 3.5 either with standard or non-standard
1809                            journal */
1810                         if (convert_reiserfs(s)) {
1811                                 /* and -o conv is given */
1812                                 if (!silent)
1813                                         reiserfs_info(s,
1814                                                       "converting 3.5 filesystem to the 3.6 format");
1815
1816                                 if (is_reiserfs_3_5(rs))
1817                                         /* put magic string of 3.6 format. 2.2 will not be able to
1818                                            mount this filesystem anymore */
1819                                         memcpy(rs->s_v1.s_magic,
1820                                                reiserfs_3_6_magic_string,
1821                                                sizeof
1822                                                (reiserfs_3_6_magic_string));
1823
1824                                 set_sb_version(rs, REISERFS_VERSION_2);
1825                                 reiserfs_convert_objectid_map_v1(s);
1826                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1827                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1828                         } else if (!silent) {
1829                                 reiserfs_info(s, "using 3.5.x disk format\n");
1830                         }
1831                 } else
1832                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1833
1834
1835                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1836                 errval = journal_end(&th, s, 1);
1837                 if (errval) {
1838                         dput(s->s_root);
1839                         s->s_root = NULL;
1840                         goto error;
1841                 }
1842
1843                 if ((errval = reiserfs_lookup_privroot(s)) ||
1844                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1845                         dput(s->s_root);
1846                         s->s_root = NULL;
1847                         goto error;
1848                 }
1849
1850                 /* look for files which were to be removed in previous session */
1851                 finish_unfinished(s);
1852         } else {
1853                 if (old_format_only(s) && !silent) {
1854                         reiserfs_info(s, "using 3.5.x disk format\n");
1855                 }
1856
1857                 if ((errval = reiserfs_lookup_privroot(s)) ||
1858                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1859                         dput(s->s_root);
1860                         s->s_root = NULL;
1861                         goto error;
1862                 }
1863         }
1864         // mark hash in super block: it could be unset. overwrite should be ok
1865         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1866
1867         handle_attrs(s);
1868
1869         reiserfs_proc_info_init(s);
1870
1871         init_waitqueue_head(&(sbi->s_wait));
1872         spin_lock_init(&sbi->bitmap_lock);
1873
1874         reiserfs_write_unlock(s);
1875
1876         return (0);
1877
1878 error:
1879         if (jinit_done) {       /* kill the commit thread, free journal ram */
1880                 journal_release_error(NULL, s);
1881         }
1882
1883         reiserfs_write_unlock(s);
1884
1885         reiserfs_free_bitmap_cache(s);
1886         if (SB_BUFFER_WITH_SB(s))
1887                 brelse(SB_BUFFER_WITH_SB(s));
1888 #ifdef CONFIG_QUOTA
1889         {
1890                 int j;
1891                 for (j = 0; j < MAXQUOTAS; j++)
1892                         kfree(qf_names[j]);
1893         }
1894 #endif
1895         kfree(sbi);
1896
1897         s->s_fs_info = NULL;
1898         return errval;
1899 }
1900
1901 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1902 {
1903         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1904
1905         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1906         buf->f_bfree = sb_free_blocks(rs);
1907         buf->f_bavail = buf->f_bfree;
1908         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1909         buf->f_bsize = dentry->d_sb->s_blocksize;
1910         /* changed to accommodate gcc folks. */
1911         buf->f_type = REISERFS_SUPER_MAGIC;
1912         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1913         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1914                                 sizeof(rs->s_uuid)/2);
1915
1916         return 0;
1917 }
1918
1919 #ifdef CONFIG_QUOTA
1920 static int reiserfs_write_dquot(struct dquot *dquot)
1921 {
1922         struct reiserfs_transaction_handle th;
1923         int ret, err;
1924
1925         reiserfs_write_lock(dquot->dq_sb);
1926         ret =
1927             journal_begin(&th, dquot->dq_sb,
1928                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1929         if (ret)
1930                 goto out;
1931         ret = dquot_commit(dquot);
1932         err =
1933             journal_end(&th, dquot->dq_sb,
1934                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1935         if (!ret && err)
1936                 ret = err;
1937       out:
1938         reiserfs_write_unlock(dquot->dq_sb);
1939         return ret;
1940 }
1941
1942 static int reiserfs_acquire_dquot(struct dquot *dquot)
1943 {
1944         struct reiserfs_transaction_handle th;
1945         int ret, err;
1946
1947         reiserfs_write_lock(dquot->dq_sb);
1948         ret =
1949             journal_begin(&th, dquot->dq_sb,
1950                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1951         if (ret)
1952                 goto out;
1953         ret = dquot_acquire(dquot);
1954         err =
1955             journal_end(&th, dquot->dq_sb,
1956                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1957         if (!ret && err)
1958                 ret = err;
1959       out:
1960         reiserfs_write_unlock(dquot->dq_sb);
1961         return ret;
1962 }
1963
1964 static int reiserfs_release_dquot(struct dquot *dquot)
1965 {
1966         struct reiserfs_transaction_handle th;
1967         int ret, err;
1968
1969         reiserfs_write_lock(dquot->dq_sb);
1970         ret =
1971             journal_begin(&th, dquot->dq_sb,
1972                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1973         if (ret) {
1974                 /* Release dquot anyway to avoid endless cycle in dqput() */
1975                 dquot_release(dquot);
1976                 goto out;
1977         }
1978         ret = dquot_release(dquot);
1979         err =
1980             journal_end(&th, dquot->dq_sb,
1981                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1982         if (!ret && err)
1983                 ret = err;
1984       out:
1985         reiserfs_write_unlock(dquot->dq_sb);
1986         return ret;
1987 }
1988
1989 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1990 {
1991         /* Are we journaling quotas? */
1992         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1993             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1994                 dquot_mark_dquot_dirty(dquot);
1995                 return reiserfs_write_dquot(dquot);
1996         } else
1997                 return dquot_mark_dquot_dirty(dquot);
1998 }
1999
2000 static int reiserfs_write_info(struct super_block *sb, int type)
2001 {
2002         struct reiserfs_transaction_handle th;
2003         int ret, err;
2004
2005         /* Data block + inode block */
2006         reiserfs_write_lock(sb);
2007         ret = journal_begin(&th, sb, 2);
2008         if (ret)
2009                 goto out;
2010         ret = dquot_commit_info(sb, type);
2011         err = journal_end(&th, sb, 2);
2012         if (!ret && err)
2013                 ret = err;
2014       out:
2015         reiserfs_write_unlock(sb);
2016         return ret;
2017 }
2018
2019 /*
2020  * Turn on quotas during mount time - we need to find the quota file and such...
2021  */
2022 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2023 {
2024         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2025                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2026 }
2027
2028 /*
2029  * Standard function to be called on quota_on
2030  */
2031 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2032                              char *name, int remount)
2033 {
2034         int err;
2035         struct path path;
2036         struct inode *inode;
2037         struct reiserfs_transaction_handle th;
2038
2039         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2040                 return -EINVAL;
2041         /* No more checks needed? Path and format_id are bogus anyway... */
2042         if (remount)
2043                 return vfs_quota_on(sb, type, format_id, name, 1);
2044         err = kern_path(name, LOOKUP_FOLLOW, &path);
2045         if (err)
2046                 return err;
2047         /* Quotafile not on the same filesystem? */
2048         if (path.mnt->mnt_sb != sb) {
2049                 err = -EXDEV;
2050                 goto out;
2051         }
2052         inode = path.dentry->d_inode;
2053         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2054         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2055                 err = reiserfs_unpack(inode, NULL);
2056                 if (err) {
2057                         reiserfs_warning(sb, "super-6520",
2058                                 "Unpacking tail of quota file failed"
2059                                 " (%d). Cannot turn on quotas.", err);
2060                         err = -EINVAL;
2061                         goto out;
2062                 }
2063                 mark_inode_dirty(inode);
2064         }
2065         /* Journaling quota? */
2066         if (REISERFS_SB(sb)->s_qf_names[type]) {
2067                 /* Quotafile not of fs root? */
2068                 if (path.dentry->d_parent != sb->s_root)
2069                         reiserfs_warning(sb, "super-6521",
2070                                  "Quota file not on filesystem root. "
2071                                  "Journalled quota will not work.");
2072         }
2073
2074         /*
2075          * When we journal data on quota file, we have to flush journal to see
2076          * all updates to the file when we bypass pagecache...
2077          */
2078         if (reiserfs_file_data_log(inode)) {
2079                 /* Just start temporary transaction and finish it */
2080                 err = journal_begin(&th, sb, 1);
2081                 if (err)
2082                         goto out;
2083                 err = journal_end_sync(&th, sb, 1);
2084                 if (err)
2085                         goto out;
2086         }
2087         err = vfs_quota_on_path(sb, type, format_id, &path);
2088 out:
2089         path_put(&path);
2090         return err;
2091 }
2092
2093 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2094  * acquiring the locks... As quota files are never truncated and quota code
2095  * itself serializes the operations (and noone else should touch the files)
2096  * we don't have to be afraid of races */
2097 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2098                                    size_t len, loff_t off)
2099 {
2100         struct inode *inode = sb_dqopt(sb)->files[type];
2101         unsigned long blk = off >> sb->s_blocksize_bits;
2102         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2103         size_t toread;
2104         struct buffer_head tmp_bh, *bh;
2105         loff_t i_size = i_size_read(inode);
2106
2107         if (off > i_size)
2108                 return 0;
2109         if (off + len > i_size)
2110                 len = i_size - off;
2111         toread = len;
2112         while (toread > 0) {
2113                 tocopy =
2114                     sb->s_blocksize - offset <
2115                     toread ? sb->s_blocksize - offset : toread;
2116                 tmp_bh.b_state = 0;
2117                 /* Quota files are without tails so we can safely use this function */
2118                 reiserfs_write_lock(sb);
2119                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2120                 reiserfs_write_unlock(sb);
2121                 if (err)
2122                         return err;
2123                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2124                         memset(data, 0, tocopy);
2125                 else {
2126                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2127                         if (!bh)
2128                                 return -EIO;
2129                         memcpy(data, bh->b_data + offset, tocopy);
2130                         brelse(bh);
2131                 }
2132                 offset = 0;
2133                 toread -= tocopy;
2134                 data += tocopy;
2135                 blk++;
2136         }
2137         return len;
2138 }
2139
2140 /* Write to quotafile (we know the transaction is already started and has
2141  * enough credits) */
2142 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2143                                     const char *data, size_t len, loff_t off)
2144 {
2145         struct inode *inode = sb_dqopt(sb)->files[type];
2146         unsigned long blk = off >> sb->s_blocksize_bits;
2147         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2148         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2149         size_t towrite = len;
2150         struct buffer_head tmp_bh, *bh;
2151
2152         if (!current->journal_info) {
2153                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2154                         " cancelled because transaction is not started.\n",
2155                         (unsigned long long)off, (unsigned long long)len);
2156                 return -EIO;
2157         }
2158         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2159         while (towrite > 0) {
2160                 tocopy = sb->s_blocksize - offset < towrite ?
2161                     sb->s_blocksize - offset : towrite;
2162                 tmp_bh.b_state = 0;
2163                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2164                 if (err)
2165                         goto out;
2166                 if (offset || tocopy != sb->s_blocksize)
2167                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2168                 else
2169                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2170                 if (!bh) {
2171                         err = -EIO;
2172                         goto out;
2173                 }
2174                 lock_buffer(bh);
2175                 memcpy(bh->b_data + offset, data, tocopy);
2176                 flush_dcache_page(bh->b_page);
2177                 set_buffer_uptodate(bh);
2178                 unlock_buffer(bh);
2179                 reiserfs_prepare_for_journal(sb, bh, 1);
2180                 journal_mark_dirty(current->journal_info, sb, bh);
2181                 if (!journal_quota)
2182                         reiserfs_add_ordered_list(inode, bh);
2183                 brelse(bh);
2184                 offset = 0;
2185                 towrite -= tocopy;
2186                 data += tocopy;
2187                 blk++;
2188         }
2189 out:
2190         if (len == towrite) {
2191                 mutex_unlock(&inode->i_mutex);
2192                 return err;
2193         }
2194         if (inode->i_size < off + len - towrite)
2195                 i_size_write(inode, off + len - towrite);
2196         inode->i_version++;
2197         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2198         mark_inode_dirty(inode);
2199         mutex_unlock(&inode->i_mutex);
2200         return len - towrite;
2201 }
2202
2203 #endif
2204
2205 static int get_super_block(struct file_system_type *fs_type,
2206                            int flags, const char *dev_name,
2207                            void *data, struct vfsmount *mnt)
2208 {
2209         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2210                            mnt);
2211 }
2212
2213 static int __init init_reiserfs_fs(void)
2214 {
2215         int ret;
2216
2217         if ((ret = init_inodecache())) {
2218                 return ret;
2219         }
2220
2221         reiserfs_proc_info_global_init();
2222
2223         ret = register_filesystem(&reiserfs_fs_type);
2224
2225         if (ret == 0) {
2226                 return 0;
2227         }
2228
2229         reiserfs_proc_info_global_done();
2230         destroy_inodecache();
2231
2232         return ret;
2233 }
2234
2235 static void __exit exit_reiserfs_fs(void)
2236 {
2237         reiserfs_proc_info_global_done();
2238         unregister_filesystem(&reiserfs_fs_type);
2239         destroy_inodecache();
2240 }
2241
2242 struct file_system_type reiserfs_fs_type = {
2243         .owner = THIS_MODULE,
2244         .name = "reiserfs",
2245         .get_sb = get_super_block,
2246         .kill_sb = reiserfs_kill_sb,
2247         .fs_flags = FS_REQUIRES_DEV,
2248 };
2249
2250 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2251 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2252 MODULE_LICENSE("GPL");
2253
2254 module_init(init_reiserfs_fs);
2255 module_exit(exit_reiserfs_fs);