fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <asm/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/buffer_head.h>
  25 #include <linux/exportfs.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/vfs.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.h>
  31 #include <linux/seq_file.h>
  32
  33 struct file_system_type reiserfs_fs_type;
  34
  35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  38
  39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  40 {
  41         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  42                         strlen(reiserfs_3_5_magic_string));
  43 }
  44
  45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  46 {
  47         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  48                         strlen(reiserfs_3_6_magic_string));
  49 }
  50
  51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  52 {
  53         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  54                         strlen(reiserfs_jr_magic_string));
  55 }
  56
  57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  58 {
  59         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  60                 is_reiserfs_jr(rs));
  61 }
  62
  63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  65
  66 static int reiserfs_sync_fs(struct super_block *s, int wait)
  67 {
  68         struct reiserfs_transaction_handle th;
  69
  70         /*
  71          * Writeback quota in non-journalled quota case - journalled quota has
  72          * no dirty dquots
  73          */
  74         dquot_writeback_dquots(s, -1);
  75         reiserfs_write_lock(s);
  76         if (!journal_begin(&th, s, 1))
  77                 if (!journal_end_sync(&th, s, 1))
  78                         reiserfs_flush_old_commits(s);
  79         reiserfs_write_unlock(s);
  80         return 0;
  81 }
  82
  83 static void flush_old_commits(struct work_struct *work)
  84 {
  85         struct reiserfs_sb_info *sbi;
  86         struct super_block *s;
  87
  88         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  89         s = sbi->s_journal->j_work_sb;
  90
  91         spin_lock(&sbi->old_work_lock);
  92         sbi->work_queued = 0;
  93         spin_unlock(&sbi->old_work_lock);
  94
  95         reiserfs_sync_fs(s, 1);
  96 }
  97
  98 void reiserfs_schedule_old_flush(struct super_block *s)
  99 {
 100         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 101         unsigned long delay;
 102
 103         if (s->s_flags & MS_RDONLY)
 104                 return;
 105
 106         spin_lock(&sbi->old_work_lock);
 107         if (!sbi->work_queued) {
 108                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 109                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 110                 sbi->work_queued = 1;
 111         }
 112         spin_unlock(&sbi->old_work_lock);
 113 }
 114
 115 static void cancel_old_flush(struct super_block *s)
 116 {
 117         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 118
 119         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 120         spin_lock(&sbi->old_work_lock);
 121         sbi->work_queued = 0;
 122         spin_unlock(&sbi->old_work_lock);
 123 }
 124
 125 static int reiserfs_freeze(struct super_block *s)
 126 {
 127         struct reiserfs_transaction_handle th;
 128
 129         cancel_old_flush(s);
 130
 131         reiserfs_write_lock(s);
 132         if (!(s->s_flags & MS_RDONLY)) {
 133                 int err = journal_begin(&th, s, 1);
 134                 if (err) {
 135                         reiserfs_block_writes(&th);
 136                 } else {
 137                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 138                                                      1);
 139                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 140                         reiserfs_block_writes(&th);
 141                         journal_end_sync(&th, s, 1);
 142                 }
 143         }
 144         reiserfs_write_unlock(s);
 145         return 0;
 146 }
 147
 148 static int reiserfs_unfreeze(struct super_block *s)
 149 {
 150         reiserfs_allow_writes(s);
 151         return 0;
 152 }
 153
 154 extern const struct in_core_key MAX_IN_CORE_KEY;
 155
 156 /* this is used to delete "save link" when there are no items of a
 157    file it points to. It can either happen if unlink is completed but
 158    "save unlink" removal, or if file has both unlink and truncate
 159    pending and as unlink completes first (because key of "save link"
 160    protecting unlink is bigger that a key lf "save link" which
 161    protects truncate), so there left no items to make truncate
 162    completion on */
 163 static int remove_save_link_only(struct super_block *s,
 164                                  struct reiserfs_key *key, int oid_free)
 165 {
 166         struct reiserfs_transaction_handle th;
 167         int err;
 168
 169         /* we are going to do one balancing */
 170         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 171         if (err)
 172                 return err;
 173
 174         reiserfs_delete_solid_item(&th, NULL, key);
 175         if (oid_free)
 176                 /* removals are protected by direct items */
 177                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 178
 179         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 180 }
 181
 182 #ifdef CONFIG_QUOTA
 183 static int reiserfs_quota_on_mount(struct super_block *, int);
 184 #endif
 185
 186 /* look for uncompleted unlinks and truncates and complete them */
 187 static int finish_unfinished(struct super_block *s)
 188 {
 189         INITIALIZE_PATH(path);
 190         struct cpu_key max_cpu_key, obj_key;
 191         struct reiserfs_key save_link_key, last_inode_key;
 192         int retval = 0;
 193         struct item_head *ih;
 194         struct buffer_head *bh;
 195         int item_pos;
 196         char *item;
 197         int done;
 198         struct inode *inode;
 199         int truncate;
 200 #ifdef CONFIG_QUOTA
 201         int i;
 202         int ms_active_set;
 203         int quota_enabled[MAXQUOTAS];
 204 #endif
 205
 206         /* compose key to look for "save" links */
 207         max_cpu_key.version = KEY_FORMAT_3_5;
 208         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 209         max_cpu_key.on_disk_key.k_objectid = ~0U;
 210         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 211         max_cpu_key.key_length = 3;
 212
 213         memset(&last_inode_key, 0, sizeof(last_inode_key));
 214
 215 #ifdef CONFIG_QUOTA
 216         /* Needed for iput() to work correctly and not trash data */
 217         if (s->s_flags & MS_ACTIVE) {
 218                 ms_active_set = 0;
 219         } else {
 220                 ms_active_set = 1;
 221                 s->s_flags |= MS_ACTIVE;
 222         }
 223         /* Turn on quotas so that they are updated correctly */
 224         for (i = 0; i < MAXQUOTAS; i++) {
 225                 quota_enabled[i] = 1;
 226                 if (REISERFS_SB(s)->s_qf_names[i]) {
 227                         int ret;
 228
 229                         if (sb_has_quota_active(s, i)) {
 230                                 quota_enabled[i] = 0;
 231                                 continue;
 232                         }
 233                         ret = reiserfs_quota_on_mount(s, i);
 234                         if (ret < 0)
 235                                 reiserfs_warning(s, "reiserfs-2500",
 236                                                  "cannot turn on journaled "
 237                                                  "quota: error %d", ret);
 238                 }
 239         }
 240 #endif
 241
 242         done = 0;
 243         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 244         while (!retval) {
 245                 int depth;
 246                 retval = search_item(s, &max_cpu_key, &path);
 247                 if (retval != ITEM_NOT_FOUND) {
 248                         reiserfs_error(s, "vs-2140",
 249                                        "search_by_key returned %d", retval);
 250                         break;
 251                 }
 252
 253                 bh = get_last_bh(&path);
 254                 item_pos = get_item_pos(&path);
 255                 if (item_pos != B_NR_ITEMS(bh)) {
 256                         reiserfs_warning(s, "vs-2060",
 257                                          "wrong position found");
 258                         break;
 259                 }
 260                 item_pos--;
 261                 ih = B_N_PITEM_HEAD(bh, item_pos);
 262
 263                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 264                         /* there are no "save" links anymore */
 265                         break;
 266
 267                 save_link_key = ih->ih_key;
 268                 if (is_indirect_le_ih(ih))
 269                         truncate = 1;
 270                 else
 271                         truncate = 0;
 272
 273                 /* reiserfs_iget needs k_dirid and k_objectid only */
 274                 item = B_I_PITEM(bh, ih);
 275                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 276                 obj_key.on_disk_key.k_objectid =
 277                     le32_to_cpu(ih->ih_key.k_objectid);
 278                 obj_key.on_disk_key.k_offset = 0;
 279                 obj_key.on_disk_key.k_type = 0;
 280
 281                 pathrelse(&path);
 282
 283                 inode = reiserfs_iget(s, &obj_key);
 284                 if (!inode) {
 285                         /* the unlink almost completed, it just did not manage to remove
 286                            "save" link and release objectid */
 287                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 288                                          &obj_key);
 289                         retval = remove_save_link_only(s, &save_link_key, 1);
 290                         continue;
 291                 }
 292
 293                 if (!truncate && inode->i_nlink) {
 294                         /* file is not unlinked */
 295                         reiserfs_warning(s, "vs-2185",
 296                                          "file %K is not unlinked",
 297                                          &obj_key);
 298                         retval = remove_save_link_only(s, &save_link_key, 0);
 299                         continue;
 300                 }
 301                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 302                 dquot_initialize(inode);
 303                 reiserfs_write_lock_nested(inode->i_sb, depth);
 304
 305                 if (truncate && S_ISDIR(inode->i_mode)) {
 306                         /* We got a truncate request for a dir which is impossible.
 307                            The only imaginable way is to execute unfinished truncate request
 308                            then boot into old kernel, remove the file and create dir with
 309                            the same key. */
 310                         reiserfs_warning(s, "green-2101",
 311                                          "impossible truncate on a "
 312                                          "directory %k. Please report",
 313                                          INODE_PKEY(inode));
 314                         retval = remove_save_link_only(s, &save_link_key, 0);
 315                         truncate = 0;
 316                         iput(inode);
 317                         continue;
 318                 }
 319
 320                 if (truncate) {
 321                         REISERFS_I(inode)->i_flags |=
 322                             i_link_saved_truncate_mask;
 323                         /* not completed truncate found. New size was committed together
 324                            with "save" link */
 325                         reiserfs_info(s, "Truncating %k to %Ld ..",
 326                                       INODE_PKEY(inode), inode->i_size);
 327                         reiserfs_truncate_file(inode,
 328                                                0
 329                                                /*don't update modification time */
 330                                                );
 331                         retval = remove_save_link(inode, truncate);
 332                 } else {
 333                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 334                         /* not completed unlink (rmdir) found */
 335                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 336                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 337                                         sizeof(last_inode_key))){
 338                                 last_inode_key = *INODE_PKEY(inode);
 339                                 /* removal gets completed in iput */
 340                                 retval = 0;
 341                         } else {
 342                                 reiserfs_warning(s, "super-2189", "Dead loop "
 343                                                  "in finish_unfinished "
 344                                                  "detected, just remove "
 345                                                  "save link\n");
 346                                 retval = remove_save_link_only(s,
 347                                                         &save_link_key, 0);
 348                         }
 349                 }
 350
 351                 iput(inode);
 352                 printk("done\n");
 353                 done++;
 354         }
 355         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 356
 357 #ifdef CONFIG_QUOTA
 358         /* Turn quotas off */
 359         reiserfs_write_unlock(s);
 360         for (i = 0; i < MAXQUOTAS; i++) {
 361                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 362                         dquot_quota_off(s, i);
 363         }
 364         reiserfs_write_lock(s);
 365         if (ms_active_set)
 366                 /* Restore the flag back */
 367                 s->s_flags &= ~MS_ACTIVE;
 368 #endif
 369         pathrelse(&path);
 370         if (done)
 371                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 372                               "Completed\n", done);
 373         return retval;
 374 }
 375
 376 /* to protect file being unlinked from getting lost we "safe" link files
 377    being unlinked. This link will be deleted in the same transaction with last
 378    item of file. mounting the filesystem we scan all these links and remove
 379    files which almost got lost */
 380 void add_save_link(struct reiserfs_transaction_handle *th,
 381                    struct inode *inode, int truncate)
 382 {
 383         INITIALIZE_PATH(path);
 384         int retval;
 385         struct cpu_key key;
 386         struct item_head ih;
 387         __le32 link;
 388
 389         BUG_ON(!th->t_trans_id);
 390
 391         /* file can only get one "save link" of each kind */
 392         RFALSE(truncate &&
 393                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 394                "saved link already exists for truncated inode %lx",
 395                (long)inode->i_ino);
 396         RFALSE(!truncate &&
 397                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 398                "saved link already exists for unlinked inode %lx",
 399                (long)inode->i_ino);
 400
 401         /* setup key of "save" link */
 402         key.version = KEY_FORMAT_3_5;
 403         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 404         key.on_disk_key.k_objectid = inode->i_ino;
 405         if (!truncate) {
 406                 /* unlink, rmdir, rename */
 407                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 408                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 409
 410                 /* item head of "safe" link */
 411                 make_le_item_head(&ih, &key, key.version,
 412                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 413                                   4 /*length */ , 0xffff /*free space */ );
 414         } else {
 415                 /* truncate */
 416                 if (S_ISDIR(inode->i_mode))
 417                         reiserfs_warning(inode->i_sb, "green-2102",
 418                                          "Adding a truncate savelink for "
 419                                          "a directory %k! Please report",
 420                                          INODE_PKEY(inode));
 421                 set_cpu_key_k_offset(&key, 1);
 422                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 423
 424                 /* item head of "safe" link */
 425                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 426                                   4 /*length */ , 0 /*free space */ );
 427         }
 428         key.key_length = 3;
 429
 430         /* look for its place in the tree */
 431         retval = search_item(inode->i_sb, &key, &path);
 432         if (retval != ITEM_NOT_FOUND) {
 433                 if (retval != -ENOSPC)
 434                         reiserfs_error(inode->i_sb, "vs-2100",
 435                                        "search_by_key (%K) returned %d", &key,
 436                                        retval);
 437                 pathrelse(&path);
 438                 return;
 439         }
 440
 441         /* body of "save" link */
 442         link = INODE_PKEY(inode)->k_dir_id;
 443
 444         /* put "save" link into tree, don't charge quota to anyone */
 445         retval =
 446             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 447         if (retval) {
 448                 if (retval != -ENOSPC)
 449                         reiserfs_error(inode->i_sb, "vs-2120",
 450                                        "insert_item returned %d", retval);
 451         } else {
 452                 if (truncate)
 453                         REISERFS_I(inode)->i_flags |=
 454                             i_link_saved_truncate_mask;
 455                 else
 456                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 457         }
 458 }
 459
 460 /* this opens transaction unlike add_save_link */
 461 int remove_save_link(struct inode *inode, int truncate)
 462 {
 463         struct reiserfs_transaction_handle th;
 464         struct reiserfs_key key;
 465         int err;
 466
 467         /* we are going to do one balancing only */
 468         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 469         if (err)
 470                 return err;
 471
 472         /* setup key of "save" link */
 473         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 474         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 475         if (!truncate) {
 476                 /* unlink, rmdir, rename */
 477                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 478                                     1 + inode->i_sb->s_blocksize);
 479                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 480         } else {
 481                 /* truncate */
 482                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 483                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 484         }
 485
 486         if ((truncate &&
 487              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 488             (!truncate &&
 489              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 490                 /* don't take quota bytes from anywhere */
 491                 reiserfs_delete_solid_item(&th, NULL, &key);
 492         if (!truncate) {
 493                 reiserfs_release_objectid(&th, inode->i_ino);
 494                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 495         } else
 496                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 497
 498         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 499 }
 500
 501 static void reiserfs_kill_sb(struct super_block *s)
 502 {
 503         if (REISERFS_SB(s)) {
 504                 reiserfs_proc_info_done(s);
 505                 /*
 506                  * Force any pending inode evictions to occur now. Any
 507                  * inodes to be removed that have extended attributes
 508                  * associated with them need to clean them up before
 509                  * we can release the extended attribute root dentries.
 510                  * shrink_dcache_for_umount will BUG if we don't release
 511                  * those before it's called so ->put_super is too late.
 512                  */
 513                 shrink_dcache_sb(s);
 514
 515                 dput(REISERFS_SB(s)->xattr_root);
 516                 REISERFS_SB(s)->xattr_root = NULL;
 517                 dput(REISERFS_SB(s)->priv_root);
 518                 REISERFS_SB(s)->priv_root = NULL;
 519         }
 520
 521         kill_block_super(s);
 522 }
 523
 524 static void reiserfs_put_super(struct super_block *s)
 525 {
 526         struct reiserfs_transaction_handle th;
 527         th.t_trans_id = 0;
 528
 529         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 530
 531         reiserfs_write_lock(s);
 532
 533         /* change file system state to current state if it was mounted with read-write permissions */
 534         if (!(s->s_flags & MS_RDONLY)) {
 535                 if (!journal_begin(&th, s, 10)) {
 536                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 537                                                      1);
 538                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 539                                             REISERFS_SB(s)->s_mount_state);
 540                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 541                 }
 542         }
 543
 544         /* note, journal_release checks for readonly mount, and can decide not
 545          ** to do a journal_end
 546          */
 547         journal_release(&th, s);
 548
 549         reiserfs_free_bitmap_cache(s);
 550
 551         brelse(SB_BUFFER_WITH_SB(s));
 552
 553         print_statistics(s);
 554
 555         if (REISERFS_SB(s)->reserved_blocks != 0) {
 556                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 557                                  REISERFS_SB(s)->reserved_blocks);
 558         }
 559
 560         reiserfs_write_unlock(s);
 561         mutex_destroy(&REISERFS_SB(s)->lock);
 562         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 563         kfree(s->s_fs_info);
 564         s->s_fs_info = NULL;
 565 }
 566
 567 static struct kmem_cache *reiserfs_inode_cachep;
 568
 569 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 570 {
 571         struct reiserfs_inode_info *ei;
 572         ei = (struct reiserfs_inode_info *)
 573             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 574         if (!ei)
 575                 return NULL;
 576         atomic_set(&ei->openers, 0);
 577         mutex_init(&ei->tailpack);
 578         return &ei->vfs_inode;
 579 }
 580
 581 static void reiserfs_i_callback(struct rcu_head *head)
 582 {
 583         struct inode *inode = container_of(head, struct inode, i_rcu);
 584         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 585 }
 586
 587 static void reiserfs_destroy_inode(struct inode *inode)
 588 {
 589         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 590 }
 591
 592 static void init_once(void *foo)
 593 {
 594         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 595
 596         INIT_LIST_HEAD(&ei->i_prealloc_list);
 597         inode_init_once(&ei->vfs_inode);
 598 }
 599
 600 static int __init init_inodecache(void)
 601 {
 602         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 603                                                   sizeof(struct
 604                                                          reiserfs_inode_info),
 605                                                   0, (SLAB_RECLAIM_ACCOUNT|
 606                                                         SLAB_MEM_SPREAD),
 607                                                   init_once);
 608         if (reiserfs_inode_cachep == NULL)
 609                 return -ENOMEM;
 610         return 0;
 611 }
 612
 613 static void destroy_inodecache(void)
 614 {
 615         /*
 616          * Make sure all delayed rcu free inodes are flushed before we
 617          * destroy cache.
 618          */
 619         rcu_barrier();
 620         kmem_cache_destroy(reiserfs_inode_cachep);
 621 }
 622
 623 /* we don't mark inodes dirty, we just log them */
 624 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 625 {
 626         struct reiserfs_transaction_handle th;
 627
 628         int err = 0;
 629
 630         if (inode->i_sb->s_flags & MS_RDONLY) {
 631                 reiserfs_warning(inode->i_sb, "clm-6006",
 632                                  "writing inode %lu on readonly FS",
 633                                  inode->i_ino);
 634                 return;
 635         }
 636         reiserfs_write_lock(inode->i_sb);
 637
 638         /* this is really only used for atime updates, so they don't have
 639          ** to be included in O_SYNC or fsync
 640          */
 641         err = journal_begin(&th, inode->i_sb, 1);
 642         if (err)
 643                 goto out;
 644
 645         reiserfs_update_sd(&th, inode);
 646         journal_end(&th, inode->i_sb, 1);
 647
 648 out:
 649         reiserfs_write_unlock(inode->i_sb);
 650 }
 651
 652 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 653 {
 654         struct super_block *s = root->d_sb;
 655         struct reiserfs_journal *journal = SB_JOURNAL(s);
 656         long opts = REISERFS_SB(s)->s_mount_opt;
 657
 658         if (opts & (1 << REISERFS_LARGETAIL))
 659                 seq_puts(seq, ",tails=on");
 660         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 661                 seq_puts(seq, ",notail");
 662         /* tails=small is default so we don't show it */
 663
 664         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 665                 seq_puts(seq, ",barrier=none");
 666         /* barrier=flush is default so we don't show it */
 667
 668         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 669                 seq_puts(seq, ",errors=continue");
 670         else if (opts & (1 << REISERFS_ERROR_PANIC))
 671                 seq_puts(seq, ",errors=panic");
 672         /* errors=ro is default so we don't show it */
 673
 674         if (opts & (1 << REISERFS_DATA_LOG))
 675                 seq_puts(seq, ",data=journal");
 676         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 677                 seq_puts(seq, ",data=writeback");
 678         /* data=ordered is default so we don't show it */
 679
 680         if (opts & (1 << REISERFS_ATTRS))
 681                 seq_puts(seq, ",attrs");
 682
 683         if (opts & (1 << REISERFS_XATTRS_USER))
 684                 seq_puts(seq, ",user_xattr");
 685
 686         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 687                 seq_puts(seq, ",expose_privroot");
 688
 689         if (opts & (1 << REISERFS_POSIXACL))
 690                 seq_puts(seq, ",acl");
 691
 692         if (REISERFS_SB(s)->s_jdev)
 693                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 694
 695         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 696                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 697
 698 #ifdef CONFIG_QUOTA
 699         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 700                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 701         else if (opts & (1 << REISERFS_USRQUOTA))
 702                 seq_puts(seq, ",usrquota");
 703         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 704                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 705         else if (opts & (1 << REISERFS_GRPQUOTA))
 706                 seq_puts(seq, ",grpquota");
 707         if (REISERFS_SB(s)->s_jquota_fmt) {
 708                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 709                         seq_puts(seq, ",jqfmt=vfsold");
 710                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 711                         seq_puts(seq, ",jqfmt=vfsv0");
 712         }
 713 #endif
 714
 715         /* Block allocator options */
 716         if (opts & (1 << REISERFS_NO_BORDER))
 717                 seq_puts(seq, ",block-allocator=noborder");
 718         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 719                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 720         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 721                 seq_puts(seq, ",block-allocator=hashed_relocation");
 722         if (opts & (1 << REISERFS_TEST4))
 723                 seq_puts(seq, ",block-allocator=test4");
 724         show_alloc_options(seq, s);
 725         return 0;
 726 }
 727
 728 #ifdef CONFIG_QUOTA
 729 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 730                                     size_t, loff_t);
 731 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 732                                    loff_t);
 733 #endif
 734
 735 static const struct super_operations reiserfs_sops = {
 736         .alloc_inode = reiserfs_alloc_inode,
 737         .destroy_inode = reiserfs_destroy_inode,
 738         .write_inode = reiserfs_write_inode,
 739         .dirty_inode = reiserfs_dirty_inode,
 740         .evict_inode = reiserfs_evict_inode,
 741         .put_super = reiserfs_put_super,
 742         .sync_fs = reiserfs_sync_fs,
 743         .freeze_fs = reiserfs_freeze,
 744         .unfreeze_fs = reiserfs_unfreeze,
 745         .statfs = reiserfs_statfs,
 746         .remount_fs = reiserfs_remount,
 747         .show_options = reiserfs_show_options,
 748 #ifdef CONFIG_QUOTA
 749         .quota_read = reiserfs_quota_read,
 750         .quota_write = reiserfs_quota_write,
 751 #endif
 752 };
 753
 754 #ifdef CONFIG_QUOTA
 755 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 756
 757 static int reiserfs_write_dquot(struct dquot *);
 758 static int reiserfs_acquire_dquot(struct dquot *);
 759 static int reiserfs_release_dquot(struct dquot *);
 760 static int reiserfs_mark_dquot_dirty(struct dquot *);
 761 static int reiserfs_write_info(struct super_block *, int);
 762 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 763
 764 static const struct dquot_operations reiserfs_quota_operations = {
 765         .write_dquot = reiserfs_write_dquot,
 766         .acquire_dquot = reiserfs_acquire_dquot,
 767         .release_dquot = reiserfs_release_dquot,
 768         .mark_dirty = reiserfs_mark_dquot_dirty,
 769         .write_info = reiserfs_write_info,
 770         .alloc_dquot    = dquot_alloc,
 771         .destroy_dquot  = dquot_destroy,
 772 };
 773
 774 static const struct quotactl_ops reiserfs_qctl_operations = {
 775         .quota_on = reiserfs_quota_on,
 776         .quota_off = dquot_quota_off,
 777         .quota_sync = dquot_quota_sync,
 778         .get_info = dquot_get_dqinfo,
 779         .set_info = dquot_set_dqinfo,
 780         .get_dqblk = dquot_get_dqblk,
 781         .set_dqblk = dquot_set_dqblk,
 782 };
 783 #endif
 784
 785 static const struct export_operations reiserfs_export_ops = {
 786         .encode_fh = reiserfs_encode_fh,
 787         .fh_to_dentry = reiserfs_fh_to_dentry,
 788         .fh_to_parent = reiserfs_fh_to_parent,
 789         .get_parent = reiserfs_get_parent,
 790 };
 791
 792 /* this struct is used in reiserfs_getopt () for containing the value for those
 793    mount options that have values rather than being toggles. */
 794 typedef struct {
 795         char *value;
 796         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 797                                    value is found, 0 is no bits are to be changed. */
 798         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 799                                    value is found, 0 is no bits are to be changed. This is
 800                                    applied BEFORE setmask */
 801 } arg_desc_t;
 802
 803 /* Set this bit in arg_required to allow empty arguments */
 804 #define REISERFS_OPT_ALLOWEMPTY 31
 805
 806 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 807    mount options */
 808 typedef struct {
 809         char *option_name;
 810         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 811         const arg_desc_t *values;       /* list of values accepted by an option */
 812         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 813                                    value is found, 0 is no bits are to be changed. */
 814         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 815                                    value is found, 0 is no bits are to be changed. This is
 816                                    applied BEFORE setmask */
 817 } opt_desc_t;
 818
 819 /* possible values for -o data= */
 820 static const arg_desc_t logging_mode[] = {
 821         {"ordered", 1 << REISERFS_DATA_ORDERED,
 822          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 823         {"journal", 1 << REISERFS_DATA_LOG,
 824          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 825         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 826          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 827         {.value = NULL}
 828 };
 829
 830 /* possible values for -o barrier= */
 831 static const arg_desc_t barrier_mode[] = {
 832         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 833         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 834         {.value = NULL}
 835 };
 836
 837 /* possible values for "-o block-allocator=" and bits which are to be set in
 838    s_mount_opt of reiserfs specific part of in-core super block */
 839 static const arg_desc_t balloc[] = {
 840         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 841         {"border", 0, 1 << REISERFS_NO_BORDER},
 842         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 843         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 844         {"test4", 1 << REISERFS_TEST4, 0},
 845         {"notest4", 0, 1 << REISERFS_TEST4},
 846         {NULL, 0, 0}
 847 };
 848
 849 static const arg_desc_t tails[] = {
 850         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 851         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 852         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 853         {NULL, 0, 0}
 854 };
 855
 856 static const arg_desc_t error_actions[] = {
 857         {"panic", 1 << REISERFS_ERROR_PANIC,
 858          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 859         {"ro-remount", 1 << REISERFS_ERROR_RO,
 860          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 861 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 862         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 863          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 864 #endif
 865         {NULL, 0, 0},
 866 };
 867
 868 /* proceed only one option from a list *cur - string containing of mount options
 869    opts - array of options which are accepted
 870    opt_arg - if option is found and requires an argument and if it is specifed
 871    in the input - pointer to the argument is stored here
 872    bit_flags - if option requires to set a certain bit - it is set here
 873    return -1 if unknown option is found, opt->arg_required otherwise */
 874 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 875                            char **opt_arg, unsigned long *bit_flags)
 876 {
 877         char *p;
 878         /* foo=bar,
 879            ^   ^  ^
 880            |   |  +-- option_end
 881            |   +-- arg_start
 882            +-- option_start
 883          */
 884         const opt_desc_t *opt;
 885         const arg_desc_t *arg;
 886
 887         p = *cur;
 888
 889         /* assume argument cannot contain commas */
 890         *cur = strchr(p, ',');
 891         if (*cur) {
 892                 *(*cur) = '\0';
 893                 (*cur)++;
 894         }
 895
 896         if (!strncmp(p, "alloc=", 6)) {
 897                 /* Ugly special case, probably we should redo options parser so that
 898                    it can understand several arguments for some options, also so that
 899                    it can fill several bitfields with option values. */
 900                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 901                         return -1;
 902                 } else {
 903                         return 0;
 904                 }
 905         }
 906
 907         /* for every option in the list */
 908         for (opt = opts; opt->option_name; opt++) {
 909                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 910                         if (bit_flags) {
 911                                 if (opt->clrmask ==
 912                                     (1 << REISERFS_UNSUPPORTED_OPT))
 913                                         reiserfs_warning(s, "super-6500",
 914                                                          "%s not supported.\n",
 915                                                          p);
 916                                 else
 917                                         *bit_flags &= ~opt->clrmask;
 918                                 if (opt->setmask ==
 919                                     (1 << REISERFS_UNSUPPORTED_OPT))
 920                                         reiserfs_warning(s, "super-6501",
 921                                                          "%s not supported.\n",
 922                                                          p);
 923                                 else
 924                                         *bit_flags |= opt->setmask;
 925                         }
 926                         break;
 927                 }
 928         }
 929         if (!opt->option_name) {
 930                 reiserfs_warning(s, "super-6502",
 931                                  "unknown mount option \"%s\"", p);
 932                 return -1;
 933         }
 934
 935         p += strlen(opt->option_name);
 936         switch (*p) {
 937         case '=':
 938                 if (!opt->arg_required) {
 939                         reiserfs_warning(s, "super-6503",
 940                                          "the option \"%s\" does not "
 941                                          "require an argument\n",
 942                                          opt->option_name);
 943                         return -1;
 944                 }
 945                 break;
 946
 947         case 0:
 948                 if (opt->arg_required) {
 949                         reiserfs_warning(s, "super-6504",
 950                                          "the option \"%s\" requires an "
 951                                          "argument\n", opt->option_name);
 952                         return -1;
 953                 }
 954                 break;
 955         default:
 956                 reiserfs_warning(s, "super-6505",
 957                                  "head of option \"%s\" is only correct\n",
 958                                  opt->option_name);
 959                 return -1;
 960         }
 961
 962         /* move to the argument, or to next option if argument is not required */
 963         p++;
 964
 965         if (opt->arg_required
 966             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 967             && !strlen(p)) {
 968                 /* this catches "option=," if not allowed */
 969                 reiserfs_warning(s, "super-6506",
 970                                  "empty argument for \"%s\"\n",
 971                                  opt->option_name);
 972                 return -1;
 973         }
 974
 975         if (!opt->values) {
 976                 /* *=NULLopt_arg contains pointer to argument */
 977                 *opt_arg = p;
 978                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 979         }
 980
 981         /* values possible for this option are listed in opt->values */
 982         for (arg = opt->values; arg->value; arg++) {
 983                 if (!strcmp(p, arg->value)) {
 984                         if (bit_flags) {
 985                                 *bit_flags &= ~arg->clrmask;
 986                                 *bit_flags |= arg->setmask;
 987                         }
 988                         return opt->arg_required;
 989                 }
 990         }
 991
 992         reiserfs_warning(s, "super-6506",
 993                          "bad value \"%s\" for option \"%s\"\n", p,
 994                          opt->option_name);
 995         return -1;
 996 }
 997
 998 /* returns 0 if something is wrong in option string, 1 - otherwise */
 999 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
1000                                   unsigned long *mount_options,
1001                                   /* after the parsing phase, contains the
1002                                      collection of bitflags defining what
1003                                      mount options were selected. */
1004                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
1005                                   char **jdev_name,
1006                                   unsigned int *commit_max_age,
1007                                   char **qf_names,
1008                                   unsigned int *qfmt)
1009 {
1010         int c;
1011         char *arg = NULL;
1012         char *pos;
1013         opt_desc_t opts[] = {
1014                 /* Compatibility stuff, so that -o notail for old setups still work */
1015                 {"tails",.arg_required = 't',.values = tails},
1016                 {"notail",.clrmask =
1017                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1018                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1019                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1020                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1021                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1022 #ifdef CONFIG_REISERFS_FS_XATTR
1023                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1024                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1025 #else
1026                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1028 #endif
1029 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1030                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1031                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1032 #else
1033                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1035 #endif
1036                 {.option_name = "nolog"},
1037                 {"replayonly",.setmask = 1 << REPLAYONLY},
1038                 {"block-allocator",.arg_required = 'a',.values = balloc},
1039                 {"data",.arg_required = 'd',.values = logging_mode},
1040                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1041                 {"resize",.arg_required = 'r',.values = NULL},
1042                 {"jdev",.arg_required = 'j',.values = NULL},
1043                 {"nolargeio",.arg_required = 'w',.values = NULL},
1044                 {"commit",.arg_required = 'c',.values = NULL},
1045                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1046                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1047                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1048                 {"errors",.arg_required = 'e',.values = error_actions},
1049                 {"usrjquota",.arg_required =
1050                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1051                 {"grpjquota",.arg_required =
1052                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1053                 {"jqfmt",.arg_required = 'f',.values = NULL},
1054                 {.option_name = NULL}
1055         };
1056
1057         *blocks = 0;
1058         if (!options || !*options)
1059                 /* use default configuration: create tails, journaling on, no
1060                    conversion to newest format */
1061                 return 1;
1062
1063         for (pos = options; pos;) {
1064                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1065                 if (c == -1)
1066                         /* wrong option is given */
1067                         return 0;
1068
1069                 if (c == 'r') {
1070                         char *p;
1071
1072                         p = NULL;
1073                         /* "resize=NNN" or "resize=auto" */
1074
1075                         if (!strcmp(arg, "auto")) {
1076                                 /* From JFS code, to auto-get the size. */
1077                                 *blocks =
1078                                     s->s_bdev->bd_inode->i_size >> s->
1079                                     s_blocksize_bits;
1080                         } else {
1081                                 *blocks = simple_strtoul(arg, &p, 0);
1082                                 if (*p != '\0') {
1083                                         /* NNN does not look like a number */
1084                                         reiserfs_warning(s, "super-6507",
1085                                                          "bad value %s for "
1086                                                          "-oresize\n", arg);
1087                                         return 0;
1088                                 }
1089                         }
1090                 }
1091
1092                 if (c == 'c') {
1093                         char *p = NULL;
1094                         unsigned long val = simple_strtoul(arg, &p, 0);
1095                         /* commit=NNN (time in seconds) */
1096                         if (*p != '\0' || val >= (unsigned int)-1) {
1097                                 reiserfs_warning(s, "super-6508",
1098                                                  "bad value %s for -ocommit\n",
1099                                                  arg);
1100                                 return 0;
1101                         }
1102                         *commit_max_age = (unsigned int)val;
1103                 }
1104
1105                 if (c == 'w') {
1106                         reiserfs_warning(s, "super-6509", "nolargeio option "
1107                                          "is no longer supported");
1108                         return 0;
1109                 }
1110
1111                 if (c == 'j') {
1112                         if (arg && *arg && jdev_name) {
1113                                 if (*jdev_name) {       //Hm, already assigned?
1114                                         reiserfs_warning(s, "super-6510",
1115                                                          "journal device was "
1116                                                          "already specified to "
1117                                                          "be %s", *jdev_name);
1118                                         return 0;
1119                                 }
1120                                 *jdev_name = arg;
1121                         }
1122                 }
1123 #ifdef CONFIG_QUOTA
1124                 if (c == 'u' || c == 'g') {
1125                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1126
1127                         if (sb_any_quota_loaded(s) &&
1128                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1129                                 reiserfs_warning(s, "super-6511",
1130                                                  "cannot change journaled "
1131                                                  "quota options when quota "
1132                                                  "turned on.");
1133                                 return 0;
1134                         }
1135                         if (*arg) {     /* Some filename specified? */
1136                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1137                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1138                                               arg)) {
1139                                         reiserfs_warning(s, "super-6512",
1140                                                          "%s quota file "
1141                                                          "already specified.",
1142                                                          QTYPE2NAME(qtype));
1143                                         return 0;
1144                                 }
1145                                 if (strchr(arg, '/')) {
1146                                         reiserfs_warning(s, "super-6513",
1147                                                          "quotafile must be "
1148                                                          "on filesystem root.");
1149                                         return 0;
1150                                 }
1151                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1152                                 if (!qf_names[qtype]) {
1153                                         reiserfs_warning(s, "reiserfs-2502",
1154                                                          "not enough memory "
1155                                                          "for storing "
1156                                                          "quotafile name.");
1157                                         return 0;
1158                                 }
1159                                 if (qtype == USRQUOTA)
1160                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1161                                 else
1162                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1163                         } else {
1164                                 if (qf_names[qtype] !=
1165                                     REISERFS_SB(s)->s_qf_names[qtype])
1166                                         kfree(qf_names[qtype]);
1167                                 qf_names[qtype] = NULL;
1168                                 if (qtype == USRQUOTA)
1169                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1170                                 else
1171                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1172                         }
1173                 }
1174                 if (c == 'f') {
1175                         if (!strcmp(arg, "vfsold"))
1176                                 *qfmt = QFMT_VFS_OLD;
1177                         else if (!strcmp(arg, "vfsv0"))
1178                                 *qfmt = QFMT_VFS_V0;
1179                         else {
1180                                 reiserfs_warning(s, "super-6514",
1181                                                  "unknown quota format "
1182                                                  "specified.");
1183                                 return 0;
1184                         }
1185                         if (sb_any_quota_loaded(s) &&
1186                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1187                                 reiserfs_warning(s, "super-6515",
1188                                                  "cannot change journaled "
1189                                                  "quota options when quota "
1190                                                  "turned on.");
1191                                 return 0;
1192                         }
1193                 }
1194 #else
1195                 if (c == 'u' || c == 'g' || c == 'f') {
1196                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1197                                          "quota options not supported.");
1198                         return 0;
1199                 }
1200 #endif
1201         }
1202
1203 #ifdef CONFIG_QUOTA
1204         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1205             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1206                 reiserfs_warning(s, "super-6515",
1207                                  "journaled quota format not specified.");
1208                 return 0;
1209         }
1210         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1211                sb_has_quota_loaded(s, USRQUOTA)) ||
1212             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1213                sb_has_quota_loaded(s, GRPQUOTA))) {
1214                 reiserfs_warning(s, "super-6516", "quota options must "
1215                                  "be present when quota is turned on.");
1216                 return 0;
1217         }
1218 #endif
1219
1220         return 1;
1221 }
1222
1223 static void switch_data_mode(struct super_block *s, unsigned long mode)
1224 {
1225         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1226                                          (1 << REISERFS_DATA_ORDERED) |
1227                                          (1 << REISERFS_DATA_WRITEBACK));
1228         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1229 }
1230
1231 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1232 {
1233         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1234                 if (!reiserfs_data_log(s)) {
1235                         switch_data_mode(s, REISERFS_DATA_LOG);
1236                         reiserfs_info(s, "switching to journaled data mode\n");
1237                 }
1238         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1239                 if (!reiserfs_data_ordered(s)) {
1240                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1241                         reiserfs_info(s, "switching to ordered data mode\n");
1242                 }
1243         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1244                 if (!reiserfs_data_writeback(s)) {
1245                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1246                         reiserfs_info(s, "switching to writeback data mode\n");
1247                 }
1248         }
1249 }
1250
1251 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1252 {
1253         int flush = (1 << REISERFS_BARRIER_FLUSH);
1254         int none = (1 << REISERFS_BARRIER_NONE);
1255         int all_barrier = flush | none;
1256
1257         if (bits & all_barrier) {
1258                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1259                 if (bits & flush) {
1260                         REISERFS_SB(s)->s_mount_opt |= flush;
1261                         printk("reiserfs: enabling write barrier flush mode\n");
1262                 } else if (bits & none) {
1263                         REISERFS_SB(s)->s_mount_opt |= none;
1264                         printk("reiserfs: write barriers turned off\n");
1265                 }
1266         }
1267 }
1268
1269 static void handle_attrs(struct super_block *s)
1270 {
1271         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1272
1273         if (reiserfs_attrs(s)) {
1274                 if (old_format_only(s)) {
1275                         reiserfs_warning(s, "super-6517", "cannot support "
1276                                          "attributes on 3.5.x disk format");
1277                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1278                         return;
1279                 }
1280                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1281                         reiserfs_warning(s, "super-6518", "cannot support "
1282                                          "attributes until flag is set in "
1283                                          "super-block");
1284                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1285                 }
1286         }
1287 }
1288
1289 #ifdef CONFIG_QUOTA
1290 static void handle_quota_files(struct super_block *s, char **qf_names,
1291                                unsigned int *qfmt)
1292 {
1293         int i;
1294
1295         for (i = 0; i < MAXQUOTAS; i++) {
1296                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1297                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1298                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1299         }
1300         if (*qfmt)
1301                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1302 }
1303 #endif
1304
1305 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1306 {
1307         struct reiserfs_super_block *rs;
1308         struct reiserfs_transaction_handle th;
1309         unsigned long blocks;
1310         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1311         unsigned long safe_mask = 0;
1312         unsigned int commit_max_age = (unsigned int)-1;
1313         struct reiserfs_journal *journal = SB_JOURNAL(s);
1314         char *new_opts = kstrdup(arg, GFP_KERNEL);
1315         int err;
1316         char *qf_names[MAXQUOTAS];
1317         unsigned int qfmt = 0;
1318 #ifdef CONFIG_QUOTA
1319         int i;
1320 #endif
1321
1322         sync_filesystem(s);
1323         reiserfs_write_lock(s);
1324
1325 #ifdef CONFIG_QUOTA
1326         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1327 #endif
1328
1329         rs = SB_DISK_SUPER_BLOCK(s);
1330
1331         if (!reiserfs_parse_options
1332             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1333             qf_names, &qfmt)) {
1334 #ifdef CONFIG_QUOTA
1335                 for (i = 0; i < MAXQUOTAS; i++)
1336                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1337                                 kfree(qf_names[i]);
1338 #endif
1339                 err = -EINVAL;
1340                 goto out_err_unlock;
1341         }
1342 #ifdef CONFIG_QUOTA
1343         handle_quota_files(s, qf_names, &qfmt);
1344 #endif
1345
1346         handle_attrs(s);
1347
1348         /* Add options that are safe here */
1349         safe_mask |= 1 << REISERFS_SMALLTAIL;
1350         safe_mask |= 1 << REISERFS_LARGETAIL;
1351         safe_mask |= 1 << REISERFS_NO_BORDER;
1352         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1353         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1354         safe_mask |= 1 << REISERFS_TEST4;
1355         safe_mask |= 1 << REISERFS_ATTRS;
1356         safe_mask |= 1 << REISERFS_XATTRS_USER;
1357         safe_mask |= 1 << REISERFS_POSIXACL;
1358         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1359         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1360         safe_mask |= 1 << REISERFS_ERROR_RO;
1361         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1362         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1363         safe_mask |= 1 << REISERFS_USRQUOTA;
1364         safe_mask |= 1 << REISERFS_GRPQUOTA;
1365
1366         /* Update the bitmask, taking care to keep
1367          * the bits we're not allowed to change here */
1368         REISERFS_SB(s)->s_mount_opt =
1369             (REISERFS_SB(s)->
1370              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1371
1372         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1373                 journal->j_max_commit_age = commit_max_age;
1374                 journal->j_max_trans_age = commit_max_age;
1375         } else if (commit_max_age == 0) {
1376                 /* 0 means restore defaults. */
1377                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1378                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1379         }
1380
1381         if (blocks) {
1382                 err = reiserfs_resize(s, blocks);
1383                 if (err != 0)
1384                         goto out_err_unlock;
1385         }
1386
1387         if (*mount_flags & MS_RDONLY) {
1388                 reiserfs_write_unlock(s);
1389                 reiserfs_xattr_init(s, *mount_flags);
1390                 /* remount read-only */
1391                 if (s->s_flags & MS_RDONLY)
1392                         /* it is read-only already */
1393                         goto out_ok_unlocked;
1394
1395                 err = dquot_suspend(s, -1);
1396                 if (err < 0)
1397                         goto out_err;
1398
1399                 /* try to remount file system with read-only permissions */
1400                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1401                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1402                         goto out_ok_unlocked;
1403                 }
1404
1405                 reiserfs_write_lock(s);
1406
1407                 err = journal_begin(&th, s, 10);
1408                 if (err)
1409                         goto out_err_unlock;
1410
1411                 /* Mounting a rw partition read-only. */
1412                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1413                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1414                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1415         } else {
1416                 /* remount read-write */
1417                 if (!(s->s_flags & MS_RDONLY)) {
1418                         reiserfs_write_unlock(s);
1419                         reiserfs_xattr_init(s, *mount_flags);
1420                         goto out_ok_unlocked;   /* We are read-write already */
1421                 }
1422
1423                 if (reiserfs_is_journal_aborted(journal)) {
1424                         err = journal->j_errno;
1425                         goto out_err_unlock;
1426                 }
1427
1428                 handle_data_mode(s, mount_options);
1429                 handle_barrier_mode(s, mount_options);
1430                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1431                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1432                 err = journal_begin(&th, s, 10);
1433                 if (err)
1434                         goto out_err_unlock;
1435
1436                 /* Mount a partition which is read-only, read-write */
1437                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1438                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1439                 s->s_flags &= ~MS_RDONLY;
1440                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1441                 if (!old_format_only(s))
1442                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1443                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1444                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1445                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1446         }
1447         /* this will force a full flush of all journal lists */
1448         SB_JOURNAL(s)->j_must_wait = 1;
1449         err = journal_end(&th, s, 10);
1450         if (err)
1451                 goto out_err_unlock;
1452
1453         reiserfs_write_unlock(s);
1454         if (!(*mount_flags & MS_RDONLY)) {
1455                 dquot_resume(s, -1);
1456                 reiserfs_write_lock(s);
1457                 finish_unfinished(s);
1458                 reiserfs_write_unlock(s);
1459                 reiserfs_xattr_init(s, *mount_flags);
1460         }
1461
1462 out_ok_unlocked:
1463         replace_mount_options(s, new_opts);
1464         return 0;
1465
1466 out_err_unlock:
1467         reiserfs_write_unlock(s);
1468 out_err:
1469         kfree(new_opts);
1470         return err;
1471 }
1472
1473 static int read_super_block(struct super_block *s, int offset)
1474 {
1475         struct buffer_head *bh;
1476         struct reiserfs_super_block *rs;
1477         int fs_blocksize;
1478
1479         bh = sb_bread(s, offset / s->s_blocksize);
1480         if (!bh) {
1481                 reiserfs_warning(s, "sh-2006",
1482                                  "bread failed (dev %s, block %lu, size %lu)",
1483                                  s->s_id, offset / s->s_blocksize,
1484                                  s->s_blocksize);
1485                 return 1;
1486         }
1487
1488         rs = (struct reiserfs_super_block *)bh->b_data;
1489         if (!is_any_reiserfs_magic_string(rs)) {
1490                 brelse(bh);
1491                 return 1;
1492         }
1493         //
1494         // ok, reiserfs signature (old or new) found in at the given offset
1495         //
1496         fs_blocksize = sb_blocksize(rs);
1497         brelse(bh);
1498         sb_set_blocksize(s, fs_blocksize);
1499
1500         bh = sb_bread(s, offset / s->s_blocksize);
1501         if (!bh) {
1502                 reiserfs_warning(s, "sh-2007",
1503                                  "bread failed (dev %s, block %lu, size %lu)",
1504                                  s->s_id, offset / s->s_blocksize,
1505                                  s->s_blocksize);
1506                 return 1;
1507         }
1508
1509         rs = (struct reiserfs_super_block *)bh->b_data;
1510         if (sb_blocksize(rs) != s->s_blocksize) {
1511                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1512                                  "filesystem on (dev %s, block %Lu, size %lu)",
1513                                  s->s_id,
1514                                  (unsigned long long)bh->b_blocknr,
1515                                  s->s_blocksize);
1516                 brelse(bh);
1517                 return 1;
1518         }
1519
1520         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1521                 brelse(bh);
1522                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1523                                  "--rebuild-tree run detected. Please run\n"
1524                                  "reiserfsck --rebuild-tree and wait for a "
1525                                  "completion. If that fails\n"
1526                                  "get newer reiserfsprogs package");
1527                 return 1;
1528         }
1529
1530         SB_BUFFER_WITH_SB(s) = bh;
1531         SB_DISK_SUPER_BLOCK(s) = rs;
1532
1533         if (is_reiserfs_jr(rs)) {
1534                 /* magic is of non-standard journal filesystem, look at s_version to
1535                    find which format is in use */
1536                 if (sb_version(rs) == REISERFS_VERSION_2)
1537                         reiserfs_info(s, "found reiserfs format \"3.6\""
1538                                       " with non-standard journal\n");
1539                 else if (sb_version(rs) == REISERFS_VERSION_1)
1540                         reiserfs_info(s, "found reiserfs format \"3.5\""
1541                                       " with non-standard journal\n");
1542                 else {
1543                         reiserfs_warning(s, "sh-2012", "found unknown "
1544                                          "format \"%u\" of reiserfs with "
1545                                          "non-standard magic", sb_version(rs));
1546                         return 1;
1547                 }
1548         } else
1549                 /* s_version of standard format may contain incorrect information,
1550                    so we just look at the magic string */
1551                 reiserfs_info(s,
1552                               "found reiserfs format \"%s\" with standard journal\n",
1553                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1554
1555         s->s_op = &reiserfs_sops;
1556         s->s_export_op = &reiserfs_export_ops;
1557 #ifdef CONFIG_QUOTA
1558         s->s_qcop = &reiserfs_qctl_operations;
1559         s->dq_op = &reiserfs_quota_operations;
1560 #endif
1561
1562         /* new format is limited by the 32 bit wide i_blocks field, want to
1563          ** be one full block below that.
1564          */
1565         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1566         return 0;
1567 }
1568
1569 /* after journal replay, reread all bitmap and super blocks */
1570 static int reread_meta_blocks(struct super_block *s)
1571 {
1572         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1573         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1574         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1575                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1576                 return 1;
1577         }
1578
1579         return 0;
1580 }
1581
1582 /////////////////////////////////////////////////////
1583 // hash detection stuff
1584
1585 // if root directory is empty - we set default - Yura's - hash and
1586 // warn about it
1587 // FIXME: we look for only one name in a directory. If tea and yura
1588 // bith have the same value - we ask user to send report to the
1589 // mailing list
1590 static __u32 find_hash_out(struct super_block *s)
1591 {
1592         int retval;
1593         struct inode *inode;
1594         struct cpu_key key;
1595         INITIALIZE_PATH(path);
1596         struct reiserfs_dir_entry de;
1597         __u32 hash = DEFAULT_HASH;
1598
1599         inode = s->s_root->d_inode;
1600
1601         do {                    // Some serious "goto"-hater was there ;)
1602                 u32 teahash, r5hash, yurahash;
1603
1604                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1605                 retval = search_by_entry_key(s, &key, &path, &de);
1606                 if (retval == IO_ERROR) {
1607                         pathrelse(&path);
1608                         return UNSET_HASH;
1609                 }
1610                 if (retval == NAME_NOT_FOUND)
1611                         de.de_entry_num--;
1612                 set_de_name_and_namelen(&de);
1613                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1614                         /* allow override in this case */
1615                         if (reiserfs_rupasov_hash(s)) {
1616                                 hash = YURA_HASH;
1617                         }
1618                         reiserfs_info(s, "FS seems to be empty, autodetect "
1619                                          "is using the default hash\n");
1620                         break;
1621                 }
1622                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1623                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1624                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1625                 if (((teahash == r5hash)
1626                      &&
1627                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1628                       == r5hash)) || ((teahash == yurahash)
1629                                       && (yurahash ==
1630                                           GET_HASH_VALUE(deh_offset
1631                                                          (&
1632                                                           (de.
1633                                                            de_deh[de.
1634                                                                   de_entry_num])))))
1635                     || ((r5hash == yurahash)
1636                         && (yurahash ==
1637                             GET_HASH_VALUE(deh_offset
1638                                            (&(de.de_deh[de.de_entry_num])))))) {
1639                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1640                                          "automatically detect hash function. "
1641                                          "Please mount with -o "
1642                                          "hash={tea,rupasov,r5}");
1643                         hash = UNSET_HASH;
1644                         break;
1645                 }
1646                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1647                     yurahash)
1648                         hash = YURA_HASH;
1649                 else if (GET_HASH_VALUE
1650                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1651                         hash = TEA_HASH;
1652                 else if (GET_HASH_VALUE
1653                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1654                         hash = R5_HASH;
1655                 else {
1656                         reiserfs_warning(s, "reiserfs-2506",
1657                                          "Unrecognised hash function");
1658                         hash = UNSET_HASH;
1659                 }
1660         } while (0);
1661
1662         pathrelse(&path);
1663         return hash;
1664 }
1665
1666 // finds out which hash names are sorted with
1667 static int what_hash(struct super_block *s)
1668 {
1669         __u32 code;
1670
1671         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1672
1673         /* reiserfs_hash_detect() == true if any of the hash mount options
1674          ** were used.  We must check them to make sure the user isn't
1675          ** using a bad hash value
1676          */
1677         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1678                 code = find_hash_out(s);
1679
1680         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1681                 /* detection has found the hash, and we must check against the
1682                  ** mount options
1683                  */
1684                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1685                         reiserfs_warning(s, "reiserfs-2507",
1686                                          "Error, %s hash detected, "
1687                                          "unable to force rupasov hash",
1688                                          reiserfs_hashname(code));
1689                         code = UNSET_HASH;
1690                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1691                         reiserfs_warning(s, "reiserfs-2508",
1692                                          "Error, %s hash detected, "
1693                                          "unable to force tea hash",
1694                                          reiserfs_hashname(code));
1695                         code = UNSET_HASH;
1696                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1697                         reiserfs_warning(s, "reiserfs-2509",
1698                                          "Error, %s hash detected, "
1699                                          "unable to force r5 hash",
1700                                          reiserfs_hashname(code));
1701                         code = UNSET_HASH;
1702                 }
1703         } else {
1704                 /* find_hash_out was not called or could not determine the hash */
1705                 if (reiserfs_rupasov_hash(s)) {
1706                         code = YURA_HASH;
1707                 } else if (reiserfs_tea_hash(s)) {
1708                         code = TEA_HASH;
1709                 } else if (reiserfs_r5_hash(s)) {
1710                         code = R5_HASH;
1711                 }
1712         }
1713
1714         /* if we are mounted RW, and we have a new valid hash code, update
1715          ** the super
1716          */
1717         if (code != UNSET_HASH &&
1718             !(s->s_flags & MS_RDONLY) &&
1719             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1720                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1721         }
1722         return code;
1723 }
1724
1725 // return pointer to appropriate function
1726 static hashf_t hash_function(struct super_block *s)
1727 {
1728         switch (what_hash(s)) {
1729         case TEA_HASH:
1730                 reiserfs_info(s, "Using tea hash to sort names\n");
1731                 return keyed_hash;
1732         case YURA_HASH:
1733                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1734                 return yura_hash;
1735         case R5_HASH:
1736                 reiserfs_info(s, "Using r5 hash to sort names\n");
1737                 return r5_hash;
1738         }
1739         return NULL;
1740 }
1741
1742 // this is used to set up correct value for old partitions
1743 static int function2code(hashf_t func)
1744 {
1745         if (func == keyed_hash)
1746                 return TEA_HASH;
1747         if (func == yura_hash)
1748                 return YURA_HASH;
1749         if (func == r5_hash)
1750                 return R5_HASH;
1751
1752         BUG();                  // should never happen
1753
1754         return 0;
1755 }
1756
1757 #define SWARN(silent, s, id, ...)                       \
1758         if (!(silent))                          \
1759                 reiserfs_warning(s, id, __VA_ARGS__)
1760
1761 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1762 {
1763         struct inode *root_inode;
1764         struct reiserfs_transaction_handle th;
1765         int old_format = 0;
1766         unsigned long blocks;
1767         unsigned int commit_max_age = 0;
1768         int jinit_done = 0;
1769         struct reiserfs_iget_args args;
1770         struct reiserfs_super_block *rs;
1771         char *jdev_name;
1772         struct reiserfs_sb_info *sbi;
1773         int errval = -EINVAL;
1774         char *qf_names[MAXQUOTAS] = {};
1775         unsigned int qfmt = 0;
1776
1777         save_mount_options(s, data);
1778
1779         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1780         if (!sbi)
1781                 return -ENOMEM;
1782         s->s_fs_info = sbi;
1783         /* Set default values for options: non-aggressive tails, RO on errors */
1784         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1785         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1786         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1787         /* no preallocation minimum, be smart in
1788            reiserfs_file_write instead */
1789         sbi->s_alloc_options.preallocmin = 0;
1790         /* Preallocate by 16 blocks (17-1) at once */
1791         sbi->s_alloc_options.preallocsize = 17;
1792         /* setup default block allocator options */
1793         reiserfs_init_alloc_options(s);
1794
1795         spin_lock_init(&sbi->old_work_lock);
1796         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1797         mutex_init(&sbi->lock);
1798         sbi->lock_depth = -1;
1799
1800         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1801                                          s->s_id);
1802         if (!sbi->commit_wq) {
1803                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1804                 errval = -ENOMEM;
1805                 goto error_unlocked;
1806         }
1807
1808         jdev_name = NULL;
1809         if (reiserfs_parse_options
1810             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1811              &commit_max_age, qf_names, &qfmt) == 0) {
1812                 goto error_unlocked;
1813         }
1814         if (jdev_name && jdev_name[0]) {
1815                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1816                 if (!sbi->s_jdev) {
1817                         SWARN(silent, s, "", "Cannot allocate memory for "
1818                                 "journal device name");
1819                         goto error;
1820                 }
1821         }
1822 #ifdef CONFIG_QUOTA
1823         handle_quota_files(s, qf_names, &qfmt);
1824 #endif
1825
1826         if (blocks) {
1827                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1828                 goto error_unlocked;
1829         }
1830
1831         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1832         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1833                 old_format = 1;
1834         /* try new format (64-th 1k block), which can contain reiserfs super block */
1835         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1836                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1837                       s->s_id);
1838                 goto error_unlocked;
1839         }
1840
1841         rs = SB_DISK_SUPER_BLOCK(s);
1842         /* Let's do basic sanity check to verify that underlying device is not
1843            smaller than the filesystem. If the check fails then abort and scream,
1844            because bad stuff will happen otherwise. */
1845         if (s->s_bdev && s->s_bdev->bd_inode
1846             && i_size_read(s->s_bdev->bd_inode) <
1847             sb_block_count(rs) * sb_blocksize(rs)) {
1848                 SWARN(silent, s, "", "Filesystem cannot be "
1849                       "mounted because it is bigger than the device");
1850                 SWARN(silent, s, "", "You may need to run fsck "
1851                       "or increase size of your LVM partition");
1852                 SWARN(silent, s, "", "Or may be you forgot to "
1853                       "reboot after fdisk when it told you to");
1854                 goto error_unlocked;
1855         }
1856
1857         sbi->s_mount_state = SB_REISERFS_STATE(s);
1858         sbi->s_mount_state = REISERFS_VALID_FS;
1859
1860         if ((errval = reiserfs_init_bitmap_cache(s))) {
1861                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1862                 goto error_unlocked;
1863         }
1864
1865         errval = -EINVAL;
1866 #ifdef CONFIG_REISERFS_CHECK
1867         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1868         SWARN(silent, s, "", "- it is slow mode for debugging.");
1869 #endif
1870
1871         /* make data=ordered the default */
1872         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1873             !reiserfs_data_writeback(s)) {
1874                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1875         }
1876
1877         if (reiserfs_data_log(s)) {
1878                 reiserfs_info(s, "using journaled data mode\n");
1879         } else if (reiserfs_data_ordered(s)) {
1880                 reiserfs_info(s, "using ordered data mode\n");
1881         } else {
1882                 reiserfs_info(s, "using writeback data mode\n");
1883         }
1884         if (reiserfs_barrier_flush(s)) {
1885                 printk("reiserfs: using flush barriers\n");
1886         }
1887
1888         // set_device_ro(s->s_dev, 1) ;
1889         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1890                 SWARN(silent, s, "sh-2022",
1891                       "unable to initialize journal space");
1892                 goto error_unlocked;
1893         } else {
1894                 jinit_done = 1; /* once this is set, journal_release must be called
1895                                  ** if we error out of the mount
1896                                  */
1897         }
1898
1899         if (reread_meta_blocks(s)) {
1900                 SWARN(silent, s, "jmacd-9",
1901                       "unable to reread meta blocks after journal init");
1902                 goto error_unlocked;
1903         }
1904
1905         if (replay_only(s))
1906                 goto error_unlocked;
1907
1908         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1909                 SWARN(silent, s, "clm-7000",
1910                       "Detected readonly device, marking FS readonly");
1911                 s->s_flags |= MS_RDONLY;
1912         }
1913         args.objectid = REISERFS_ROOT_OBJECTID;
1914         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1915         root_inode =
1916             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1917                          reiserfs_init_locked_inode, (void *)(&args));
1918         if (!root_inode) {
1919                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1920                 goto error_unlocked;
1921         }
1922
1923         /*
1924          * This path assumed to be called with the BKL in the old times.
1925          * Now we have inherited the big reiserfs lock from it and many
1926          * reiserfs helpers called in the mount path and elsewhere require
1927          * this lock to be held even if it's not always necessary. Let's be
1928          * conservative and hold it early. The window can be reduced after
1929          * careful review of the code.
1930          */
1931         reiserfs_write_lock(s);
1932
1933         if (root_inode->i_state & I_NEW) {
1934                 reiserfs_read_locked_inode(root_inode, &args);
1935                 unlock_new_inode(root_inode);
1936         }
1937
1938         s->s_root = d_make_root(root_inode);
1939         if (!s->s_root)
1940                 goto error;
1941         // define and initialize hash function
1942         sbi->s_hash_function = hash_function(s);
1943         if (sbi->s_hash_function == NULL) {
1944                 dput(s->s_root);
1945                 s->s_root = NULL;
1946                 goto error;
1947         }
1948
1949         if (is_reiserfs_3_5(rs)
1950             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1951                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1952         else if (old_format)
1953                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1954         else
1955                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1956
1957         if (!(s->s_flags & MS_RDONLY)) {
1958
1959                 errval = journal_begin(&th, s, 1);
1960                 if (errval) {
1961                         dput(s->s_root);
1962                         s->s_root = NULL;
1963                         goto error;
1964                 }
1965                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1966
1967                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1968                 set_sb_fs_state(rs, 0);
1969
1970                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1971                  * case, but older revisions can't. This will cause the
1972                  * file system to fail mount on those older implementations,
1973                  * avoiding corruption. -jeffm */
1974                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1975                     sb_bmap_nr(rs) != 0) {
1976                         reiserfs_warning(s, "super-2030", "This file system "
1977                                         "claims to use %u bitmap blocks in "
1978                                         "its super block, but requires %u. "
1979                                         "Clearing to zero.", sb_bmap_nr(rs),
1980                                         reiserfs_bmap_count(s));
1981
1982                         set_sb_bmap_nr(rs, 0);
1983                 }
1984
1985                 if (old_format_only(s)) {
1986                         /* filesystem of format 3.5 either with standard or non-standard
1987                            journal */
1988                         if (convert_reiserfs(s)) {
1989                                 /* and -o conv is given */
1990                                 if (!silent)
1991                                         reiserfs_info(s,
1992                                                       "converting 3.5 filesystem to the 3.6 format");
1993
1994                                 if (is_reiserfs_3_5(rs))
1995                                         /* put magic string of 3.6 format. 2.2 will not be able to
1996                                            mount this filesystem anymore */
1997                                         memcpy(rs->s_v1.s_magic,
1998                                                reiserfs_3_6_magic_string,
1999                                                sizeof
2000                                                (reiserfs_3_6_magic_string));
2001
2002                                 set_sb_version(rs, REISERFS_VERSION_2);
2003                                 reiserfs_convert_objectid_map_v1(s);
2004                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
2005                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
2006                         } else if (!silent) {
2007                                 reiserfs_info(s, "using 3.5.x disk format\n");
2008                         }
2009                 } else
2010                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2011
2012
2013                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2014                 errval = journal_end(&th, s, 1);
2015                 if (errval) {
2016                         dput(s->s_root);
2017                         s->s_root = NULL;
2018                         goto error;
2019                 }
2020
2021                 reiserfs_write_unlock(s);
2022                 if ((errval = reiserfs_lookup_privroot(s)) ||
2023                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2024                         dput(s->s_root);
2025                         s->s_root = NULL;
2026                         goto error_unlocked;
2027                 }
2028                 reiserfs_write_lock(s);
2029
2030                 /* look for files which were to be removed in previous session */
2031                 finish_unfinished(s);
2032         } else {
2033                 if (old_format_only(s) && !silent) {
2034                         reiserfs_info(s, "using 3.5.x disk format\n");
2035                 }
2036
2037                 reiserfs_write_unlock(s);
2038                 if ((errval = reiserfs_lookup_privroot(s)) ||
2039                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2040                         dput(s->s_root);
2041                         s->s_root = NULL;
2042                         goto error_unlocked;
2043                 }
2044                 reiserfs_write_lock(s);
2045         }
2046         // mark hash in super block: it could be unset. overwrite should be ok
2047         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2048
2049         handle_attrs(s);
2050
2051         reiserfs_proc_info_init(s);
2052
2053         init_waitqueue_head(&(sbi->s_wait));
2054         spin_lock_init(&sbi->bitmap_lock);
2055
2056         reiserfs_write_unlock(s);
2057
2058         return (0);
2059
2060 error:
2061         reiserfs_write_unlock(s);
2062
2063 error_unlocked:
2064         /* kill the commit thread, free journal ram */
2065         if (jinit_done) {
2066                 reiserfs_write_lock(s);
2067                 journal_release_error(NULL, s);
2068                 reiserfs_write_unlock(s);
2069         }
2070
2071         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2072
2073         reiserfs_free_bitmap_cache(s);
2074         if (SB_BUFFER_WITH_SB(s))
2075                 brelse(SB_BUFFER_WITH_SB(s));
2076 #ifdef CONFIG_QUOTA
2077         {
2078                 int j;
2079                 for (j = 0; j < MAXQUOTAS; j++)
2080                         kfree(qf_names[j]);
2081         }
2082 #endif
2083         kfree(sbi);
2084
2085         s->s_fs_info = NULL;
2086         return errval;
2087 }
2088
2089 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2090 {
2091         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2092
2093         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2094         buf->f_bfree = sb_free_blocks(rs);
2095         buf->f_bavail = buf->f_bfree;
2096         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2097         buf->f_bsize = dentry->d_sb->s_blocksize;
2098         /* changed to accommodate gcc folks. */
2099         buf->f_type = REISERFS_SUPER_MAGIC;
2100         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2101         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2102                                 sizeof(rs->s_uuid)/2);
2103
2104         return 0;
2105 }
2106
2107 #ifdef CONFIG_QUOTA
2108 static int reiserfs_write_dquot(struct dquot *dquot)
2109 {
2110         struct reiserfs_transaction_handle th;
2111         int ret, err;
2112         int depth;
2113
2114         reiserfs_write_lock(dquot->dq_sb);
2115         ret =
2116             journal_begin(&th, dquot->dq_sb,
2117                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2118         if (ret)
2119                 goto out;
2120         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2121         ret = dquot_commit(dquot);
2122         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2123         err =
2124             journal_end(&th, dquot->dq_sb,
2125                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2126         if (!ret && err)
2127                 ret = err;
2128 out:
2129         reiserfs_write_unlock(dquot->dq_sb);
2130         return ret;
2131 }
2132
2133 static int reiserfs_acquire_dquot(struct dquot *dquot)
2134 {
2135         struct reiserfs_transaction_handle th;
2136         int ret, err;
2137         int depth;
2138
2139         reiserfs_write_lock(dquot->dq_sb);
2140         ret =
2141             journal_begin(&th, dquot->dq_sb,
2142                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2143         if (ret)
2144                 goto out;
2145         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2146         ret = dquot_acquire(dquot);
2147         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2148         err =
2149             journal_end(&th, dquot->dq_sb,
2150                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2151         if (!ret && err)
2152                 ret = err;
2153 out:
2154         reiserfs_write_unlock(dquot->dq_sb);
2155         return ret;
2156 }
2157
2158 static int reiserfs_release_dquot(struct dquot *dquot)
2159 {
2160         struct reiserfs_transaction_handle th;
2161         int ret, err;
2162
2163         reiserfs_write_lock(dquot->dq_sb);
2164         ret =
2165             journal_begin(&th, dquot->dq_sb,
2166                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2167         reiserfs_write_unlock(dquot->dq_sb);
2168         if (ret) {
2169                 /* Release dquot anyway to avoid endless cycle in dqput() */
2170                 dquot_release(dquot);
2171                 goto out;
2172         }
2173         ret = dquot_release(dquot);
2174         reiserfs_write_lock(dquot->dq_sb);
2175         err =
2176             journal_end(&th, dquot->dq_sb,
2177                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2178         if (!ret && err)
2179                 ret = err;
2180         reiserfs_write_unlock(dquot->dq_sb);
2181 out:
2182         return ret;
2183 }
2184
2185 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2186 {
2187         /* Are we journaling quotas? */
2188         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2189             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2190                 dquot_mark_dquot_dirty(dquot);
2191                 return reiserfs_write_dquot(dquot);
2192         } else
2193                 return dquot_mark_dquot_dirty(dquot);
2194 }
2195
2196 static int reiserfs_write_info(struct super_block *sb, int type)
2197 {
2198         struct reiserfs_transaction_handle th;
2199         int ret, err;
2200         int depth;
2201
2202         /* Data block + inode block */
2203         reiserfs_write_lock(sb);
2204         ret = journal_begin(&th, sb, 2);
2205         if (ret)
2206                 goto out;
2207         depth = reiserfs_write_unlock_nested(sb);
2208         ret = dquot_commit_info(sb, type);
2209         reiserfs_write_lock_nested(sb, depth);
2210         err = journal_end(&th, sb, 2);
2211         if (!ret && err)
2212                 ret = err;
2213 out:
2214         reiserfs_write_unlock(sb);
2215         return ret;
2216 }
2217
2218 /*
2219  * Turn on quotas during mount time - we need to find the quota file and such...
2220  */
2221 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2222 {
2223         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2224                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2225 }
2226
2227 /*
2228  * Standard function to be called on quota_on
2229  */
2230 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2231                              struct path *path)
2232 {
2233         int err;
2234         struct inode *inode;
2235         struct reiserfs_transaction_handle th;
2236         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2237
2238         reiserfs_write_lock(sb);
2239         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2240                 err = -EINVAL;
2241                 goto out;
2242         }
2243
2244         /* Quotafile not on the same filesystem? */
2245         if (path->dentry->d_sb != sb) {
2246                 err = -EXDEV;
2247                 goto out;
2248         }
2249         inode = path->dentry->d_inode;
2250         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2251         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2252                 err = reiserfs_unpack(inode, NULL);
2253                 if (err) {
2254                         reiserfs_warning(sb, "super-6520",
2255                                 "Unpacking tail of quota file failed"
2256                                 " (%d). Cannot turn on quotas.", err);
2257                         err = -EINVAL;
2258                         goto out;
2259                 }
2260                 mark_inode_dirty(inode);
2261         }
2262         /* Journaling quota? */
2263         if (REISERFS_SB(sb)->s_qf_names[type]) {
2264                 /* Quotafile not of fs root? */
2265                 if (path->dentry->d_parent != sb->s_root)
2266                         reiserfs_warning(sb, "super-6521",
2267                                  "Quota file not on filesystem root. "
2268                                  "Journalled quota will not work.");
2269         }
2270
2271         /*
2272          * When we journal data on quota file, we have to flush journal to see
2273          * all updates to the file when we bypass pagecache...
2274          */
2275         if (reiserfs_file_data_log(inode)) {
2276                 /* Just start temporary transaction and finish it */
2277                 err = journal_begin(&th, sb, 1);
2278                 if (err)
2279                         goto out;
2280                 err = journal_end_sync(&th, sb, 1);
2281                 if (err)
2282                         goto out;
2283         }
2284         reiserfs_write_unlock(sb);
2285         return dquot_quota_on(sb, type, format_id, path);
2286 out:
2287         reiserfs_write_unlock(sb);
2288         return err;
2289 }
2290
2291 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2292  * acquiring the locks... As quota files are never truncated and quota code
2293  * itself serializes the operations (and no one else should touch the files)
2294  * we don't have to be afraid of races */
2295 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2296                                    size_t len, loff_t off)
2297 {
2298         struct inode *inode = sb_dqopt(sb)->files[type];
2299         unsigned long blk = off >> sb->s_blocksize_bits;
2300         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2301         size_t toread;
2302         struct buffer_head tmp_bh, *bh;
2303         loff_t i_size = i_size_read(inode);
2304
2305         if (off > i_size)
2306                 return 0;
2307         if (off + len > i_size)
2308                 len = i_size - off;
2309         toread = len;
2310         while (toread > 0) {
2311                 tocopy =
2312                     sb->s_blocksize - offset <
2313                     toread ? sb->s_blocksize - offset : toread;
2314                 tmp_bh.b_state = 0;
2315                 /* Quota files are without tails so we can safely use this function */
2316                 reiserfs_write_lock(sb);
2317                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2318                 reiserfs_write_unlock(sb);
2319                 if (err)
2320                         return err;
2321                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2322                         memset(data, 0, tocopy);
2323                 else {
2324                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2325                         if (!bh)
2326                                 return -EIO;
2327                         memcpy(data, bh->b_data + offset, tocopy);
2328                         brelse(bh);
2329                 }
2330                 offset = 0;
2331                 toread -= tocopy;
2332                 data += tocopy;
2333                 blk++;
2334         }
2335         return len;
2336 }
2337
2338 /* Write to quotafile (we know the transaction is already started and has
2339  * enough credits) */
2340 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2341                                     const char *data, size_t len, loff_t off)
2342 {
2343         struct inode *inode = sb_dqopt(sb)->files[type];
2344         unsigned long blk = off >> sb->s_blocksize_bits;
2345         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2346         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2347         size_t towrite = len;
2348         struct buffer_head tmp_bh, *bh;
2349
2350         if (!current->journal_info) {
2351                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2352                         " cancelled because transaction is not started.\n",
2353                         (unsigned long long)off, (unsigned long long)len);
2354                 return -EIO;
2355         }
2356         while (towrite > 0) {
2357                 tocopy = sb->s_blocksize - offset < towrite ?
2358                     sb->s_blocksize - offset : towrite;
2359                 tmp_bh.b_state = 0;
2360                 reiserfs_write_lock(sb);
2361                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2362                 reiserfs_write_unlock(sb);
2363                 if (err)
2364                         goto out;
2365                 if (offset || tocopy != sb->s_blocksize)
2366                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2367                 else
2368                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2369                 if (!bh) {
2370                         err = -EIO;
2371                         goto out;
2372                 }
2373                 lock_buffer(bh);
2374                 memcpy(bh->b_data + offset, data, tocopy);
2375                 flush_dcache_page(bh->b_page);
2376                 set_buffer_uptodate(bh);
2377                 unlock_buffer(bh);
2378                 reiserfs_write_lock(sb);
2379                 reiserfs_prepare_for_journal(sb, bh, 1);
2380                 journal_mark_dirty(current->journal_info, sb, bh);
2381                 if (!journal_quota)
2382                         reiserfs_add_ordered_list(inode, bh);
2383                 reiserfs_write_unlock(sb);
2384                 brelse(bh);
2385                 offset = 0;
2386                 towrite -= tocopy;
2387                 data += tocopy;
2388                 blk++;
2389         }
2390 out:
2391         if (len == towrite)
2392                 return err;
2393         if (inode->i_size < off + len - towrite)
2394                 i_size_write(inode, off + len - towrite);
2395         inode->i_version++;
2396         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2397         mark_inode_dirty(inode);
2398         return len - towrite;
2399 }
2400
2401 #endif
2402
2403 static struct dentry *get_super_block(struct file_system_type *fs_type,
2404                            int flags, const char *dev_name,
2405                            void *data)
2406 {
2407         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2408 }
2409
2410 static int __init init_reiserfs_fs(void)
2411 {
2412         int ret;
2413
2414         ret = init_inodecache();
2415         if (ret)
2416                 return ret;
2417
2418         reiserfs_proc_info_global_init();
2419
2420         ret = register_filesystem(&reiserfs_fs_type);
2421         if (ret)
2422                 goto out;
2423
2424         return 0;
2425 out:
2426         reiserfs_proc_info_global_done();
2427         destroy_inodecache();
2428
2429         return ret;
2430 }
2431
2432 static void __exit exit_reiserfs_fs(void)
2433 {
2434         reiserfs_proc_info_global_done();
2435         unregister_filesystem(&reiserfs_fs_type);
2436         destroy_inodecache();
2437 }
2438
2439 struct file_system_type reiserfs_fs_type = {
2440         .owner = THIS_MODULE,
2441         .name = "reiserfs",
2442         .mount = get_super_block,
2443         .kill_sb = reiserfs_kill_sb,
2444         .fs_flags = FS_REQUIRES_DEV,
2445 };
2446 MODULE_ALIAS_FS("reiserfs");
2447
2448 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2449 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2450 MODULE_LICENSE("GPL");
2451
2452 module_init(init_reiserfs_fs);
2453 module_exit(exit_reiserfs_fs);