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         kfree(s->s_fs_info);
 563         s->s_fs_info = NULL;
 564 }
 565
 566 static struct kmem_cache *reiserfs_inode_cachep;
 567
 568 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 569 {
 570         struct reiserfs_inode_info *ei;
 571         ei = (struct reiserfs_inode_info *)
 572             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 573         if (!ei)
 574                 return NULL;
 575         atomic_set(&ei->openers, 0);
 576         mutex_init(&ei->tailpack);
 577         return &ei->vfs_inode;
 578 }
 579
 580 static void reiserfs_i_callback(struct rcu_head *head)
 581 {
 582         struct inode *inode = container_of(head, struct inode, i_rcu);
 583         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 584 }
 585
 586 static void reiserfs_destroy_inode(struct inode *inode)
 587 {
 588         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 589 }
 590
 591 static void init_once(void *foo)
 592 {
 593         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 594
 595         INIT_LIST_HEAD(&ei->i_prealloc_list);
 596         inode_init_once(&ei->vfs_inode);
 597 }
 598
 599 static int __init init_inodecache(void)
 600 {
 601         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 602                                                   sizeof(struct
 603                                                          reiserfs_inode_info),
 604                                                   0, (SLAB_RECLAIM_ACCOUNT|
 605                                                         SLAB_MEM_SPREAD),
 606                                                   init_once);
 607         if (reiserfs_inode_cachep == NULL)
 608                 return -ENOMEM;
 609         return 0;
 610 }
 611
 612 static void destroy_inodecache(void)
 613 {
 614         /*
 615          * Make sure all delayed rcu free inodes are flushed before we
 616          * destroy cache.
 617          */
 618         rcu_barrier();
 619         kmem_cache_destroy(reiserfs_inode_cachep);
 620 }
 621
 622 /* we don't mark inodes dirty, we just log them */
 623 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 624 {
 625         struct reiserfs_transaction_handle th;
 626
 627         int err = 0;
 628
 629         if (inode->i_sb->s_flags & MS_RDONLY) {
 630                 reiserfs_warning(inode->i_sb, "clm-6006",
 631                                  "writing inode %lu on readonly FS",
 632                                  inode->i_ino);
 633                 return;
 634         }
 635         reiserfs_write_lock(inode->i_sb);
 636
 637         /* this is really only used for atime updates, so they don't have
 638          ** to be included in O_SYNC or fsync
 639          */
 640         err = journal_begin(&th, inode->i_sb, 1);
 641         if (err)
 642                 goto out;
 643
 644         reiserfs_update_sd(&th, inode);
 645         journal_end(&th, inode->i_sb, 1);
 646
 647 out:
 648         reiserfs_write_unlock(inode->i_sb);
 649 }
 650
 651 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 652 {
 653         struct super_block *s = root->d_sb;
 654         struct reiserfs_journal *journal = SB_JOURNAL(s);
 655         long opts = REISERFS_SB(s)->s_mount_opt;
 656
 657         if (opts & (1 << REISERFS_LARGETAIL))
 658                 seq_puts(seq, ",tails=on");
 659         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 660                 seq_puts(seq, ",notail");
 661         /* tails=small is default so we don't show it */
 662
 663         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 664                 seq_puts(seq, ",barrier=none");
 665         /* barrier=flush is default so we don't show it */
 666
 667         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 668                 seq_puts(seq, ",errors=continue");
 669         else if (opts & (1 << REISERFS_ERROR_PANIC))
 670                 seq_puts(seq, ",errors=panic");
 671         /* errors=ro is default so we don't show it */
 672
 673         if (opts & (1 << REISERFS_DATA_LOG))
 674                 seq_puts(seq, ",data=journal");
 675         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 676                 seq_puts(seq, ",data=writeback");
 677         /* data=ordered is default so we don't show it */
 678
 679         if (opts & (1 << REISERFS_ATTRS))
 680                 seq_puts(seq, ",attrs");
 681
 682         if (opts & (1 << REISERFS_XATTRS_USER))
 683                 seq_puts(seq, ",user_xattr");
 684
 685         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 686                 seq_puts(seq, ",expose_privroot");
 687
 688         if (opts & (1 << REISERFS_POSIXACL))
 689                 seq_puts(seq, ",acl");
 690
 691         if (REISERFS_SB(s)->s_jdev)
 692                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 693
 694         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 695                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 696
 697 #ifdef CONFIG_QUOTA
 698         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 699                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 700         else if (opts & (1 << REISERFS_USRQUOTA))
 701                 seq_puts(seq, ",usrquota");
 702         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 703                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 704         else if (opts & (1 << REISERFS_GRPQUOTA))
 705                 seq_puts(seq, ",grpquota");
 706         if (REISERFS_SB(s)->s_jquota_fmt) {
 707                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 708                         seq_puts(seq, ",jqfmt=vfsold");
 709                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 710                         seq_puts(seq, ",jqfmt=vfsv0");
 711         }
 712 #endif
 713
 714         /* Block allocator options */
 715         if (opts & (1 << REISERFS_NO_BORDER))
 716                 seq_puts(seq, ",block-allocator=noborder");
 717         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 718                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 719         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 720                 seq_puts(seq, ",block-allocator=hashed_relocation");
 721         if (opts & (1 << REISERFS_TEST4))
 722                 seq_puts(seq, ",block-allocator=test4");
 723         show_alloc_options(seq, s);
 724         return 0;
 725 }
 726
 727 #ifdef CONFIG_QUOTA
 728 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 729                                     size_t, loff_t);
 730 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 731                                    loff_t);
 732 #endif
 733
 734 static const struct super_operations reiserfs_sops = {
 735         .alloc_inode = reiserfs_alloc_inode,
 736         .destroy_inode = reiserfs_destroy_inode,
 737         .write_inode = reiserfs_write_inode,
 738         .dirty_inode = reiserfs_dirty_inode,
 739         .evict_inode = reiserfs_evict_inode,
 740         .put_super = reiserfs_put_super,
 741         .sync_fs = reiserfs_sync_fs,
 742         .freeze_fs = reiserfs_freeze,
 743         .unfreeze_fs = reiserfs_unfreeze,
 744         .statfs = reiserfs_statfs,
 745         .remount_fs = reiserfs_remount,
 746         .show_options = reiserfs_show_options,
 747 #ifdef CONFIG_QUOTA
 748         .quota_read = reiserfs_quota_read,
 749         .quota_write = reiserfs_quota_write,
 750 #endif
 751 };
 752
 753 #ifdef CONFIG_QUOTA
 754 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 755
 756 static int reiserfs_write_dquot(struct dquot *);
 757 static int reiserfs_acquire_dquot(struct dquot *);
 758 static int reiserfs_release_dquot(struct dquot *);
 759 static int reiserfs_mark_dquot_dirty(struct dquot *);
 760 static int reiserfs_write_info(struct super_block *, int);
 761 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 762
 763 static const struct dquot_operations reiserfs_quota_operations = {
 764         .write_dquot = reiserfs_write_dquot,
 765         .acquire_dquot = reiserfs_acquire_dquot,
 766         .release_dquot = reiserfs_release_dquot,
 767         .mark_dirty = reiserfs_mark_dquot_dirty,
 768         .write_info = reiserfs_write_info,
 769         .alloc_dquot    = dquot_alloc,
 770         .destroy_dquot  = dquot_destroy,
 771 };
 772
 773 static const struct quotactl_ops reiserfs_qctl_operations = {
 774         .quota_on = reiserfs_quota_on,
 775         .quota_off = dquot_quota_off,
 776         .quota_sync = dquot_quota_sync,
 777         .get_info = dquot_get_dqinfo,
 778         .set_info = dquot_set_dqinfo,
 779         .get_dqblk = dquot_get_dqblk,
 780         .set_dqblk = dquot_set_dqblk,
 781 };
 782 #endif
 783
 784 static const struct export_operations reiserfs_export_ops = {
 785         .encode_fh = reiserfs_encode_fh,
 786         .fh_to_dentry = reiserfs_fh_to_dentry,
 787         .fh_to_parent = reiserfs_fh_to_parent,
 788         .get_parent = reiserfs_get_parent,
 789 };
 790
 791 /* this struct is used in reiserfs_getopt () for containing the value for those
 792    mount options that have values rather than being toggles. */
 793 typedef struct {
 794         char *value;
 795         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 796                                    value is found, 0 is no bits are to be changed. */
 797         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 798                                    value is found, 0 is no bits are to be changed. This is
 799                                    applied BEFORE setmask */
 800 } arg_desc_t;
 801
 802 /* Set this bit in arg_required to allow empty arguments */
 803 #define REISERFS_OPT_ALLOWEMPTY 31
 804
 805 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 806    mount options */
 807 typedef struct {
 808         char *option_name;
 809         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 810         const arg_desc_t *values;       /* list of values accepted by an option */
 811         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 812                                    value is found, 0 is no bits are to be changed. */
 813         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 814                                    value is found, 0 is no bits are to be changed. This is
 815                                    applied BEFORE setmask */
 816 } opt_desc_t;
 817
 818 /* possible values for -o data= */
 819 static const arg_desc_t logging_mode[] = {
 820         {"ordered", 1 << REISERFS_DATA_ORDERED,
 821          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 822         {"journal", 1 << REISERFS_DATA_LOG,
 823          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 824         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 825          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 826         {.value = NULL}
 827 };
 828
 829 /* possible values for -o barrier= */
 830 static const arg_desc_t barrier_mode[] = {
 831         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 832         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 833         {.value = NULL}
 834 };
 835
 836 /* possible values for "-o block-allocator=" and bits which are to be set in
 837    s_mount_opt of reiserfs specific part of in-core super block */
 838 static const arg_desc_t balloc[] = {
 839         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 840         {"border", 0, 1 << REISERFS_NO_BORDER},
 841         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 842         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 843         {"test4", 1 << REISERFS_TEST4, 0},
 844         {"notest4", 0, 1 << REISERFS_TEST4},
 845         {NULL, 0, 0}
 846 };
 847
 848 static const arg_desc_t tails[] = {
 849         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 850         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 851         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 852         {NULL, 0, 0}
 853 };
 854
 855 static const arg_desc_t error_actions[] = {
 856         {"panic", 1 << REISERFS_ERROR_PANIC,
 857          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 858         {"ro-remount", 1 << REISERFS_ERROR_RO,
 859          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 860 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 861         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 862          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 863 #endif
 864         {NULL, 0, 0},
 865 };
 866
 867 /* proceed only one option from a list *cur - string containing of mount options
 868    opts - array of options which are accepted
 869    opt_arg - if option is found and requires an argument and if it is specifed
 870    in the input - pointer to the argument is stored here
 871    bit_flags - if option requires to set a certain bit - it is set here
 872    return -1 if unknown option is found, opt->arg_required otherwise */
 873 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 874                            char **opt_arg, unsigned long *bit_flags)
 875 {
 876         char *p;
 877         /* foo=bar,
 878            ^   ^  ^
 879            |   |  +-- option_end
 880            |   +-- arg_start
 881            +-- option_start
 882          */
 883         const opt_desc_t *opt;
 884         const arg_desc_t *arg;
 885
 886         p = *cur;
 887
 888         /* assume argument cannot contain commas */
 889         *cur = strchr(p, ',');
 890         if (*cur) {
 891                 *(*cur) = '\0';
 892                 (*cur)++;
 893         }
 894
 895         if (!strncmp(p, "alloc=", 6)) {
 896                 /* Ugly special case, probably we should redo options parser so that
 897                    it can understand several arguments for some options, also so that
 898                    it can fill several bitfields with option values. */
 899                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 900                         return -1;
 901                 } else {
 902                         return 0;
 903                 }
 904         }
 905
 906         /* for every option in the list */
 907         for (opt = opts; opt->option_name; opt++) {
 908                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 909                         if (bit_flags) {
 910                                 if (opt->clrmask ==
 911                                     (1 << REISERFS_UNSUPPORTED_OPT))
 912                                         reiserfs_warning(s, "super-6500",
 913                                                          "%s not supported.\n",
 914                                                          p);
 915                                 else
 916                                         *bit_flags &= ~opt->clrmask;
 917                                 if (opt->setmask ==
 918                                     (1 << REISERFS_UNSUPPORTED_OPT))
 919                                         reiserfs_warning(s, "super-6501",
 920                                                          "%s not supported.\n",
 921                                                          p);
 922                                 else
 923                                         *bit_flags |= opt->setmask;
 924                         }
 925                         break;
 926                 }
 927         }
 928         if (!opt->option_name) {
 929                 reiserfs_warning(s, "super-6502",
 930                                  "unknown mount option \"%s\"", p);
 931                 return -1;
 932         }
 933
 934         p += strlen(opt->option_name);
 935         switch (*p) {
 936         case '=':
 937                 if (!opt->arg_required) {
 938                         reiserfs_warning(s, "super-6503",
 939                                          "the option \"%s\" does not "
 940                                          "require an argument\n",
 941                                          opt->option_name);
 942                         return -1;
 943                 }
 944                 break;
 945
 946         case 0:
 947                 if (opt->arg_required) {
 948                         reiserfs_warning(s, "super-6504",
 949                                          "the option \"%s\" requires an "
 950                                          "argument\n", opt->option_name);
 951                         return -1;
 952                 }
 953                 break;
 954         default:
 955                 reiserfs_warning(s, "super-6505",
 956                                  "head of option \"%s\" is only correct\n",
 957                                  opt->option_name);
 958                 return -1;
 959         }
 960
 961         /* move to the argument, or to next option if argument is not required */
 962         p++;
 963
 964         if (opt->arg_required
 965             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 966             && !strlen(p)) {
 967                 /* this catches "option=," if not allowed */
 968                 reiserfs_warning(s, "super-6506",
 969                                  "empty argument for \"%s\"\n",
 970                                  opt->option_name);
 971                 return -1;
 972         }
 973
 974         if (!opt->values) {
 975                 /* *=NULLopt_arg contains pointer to argument */
 976                 *opt_arg = p;
 977                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 978         }
 979
 980         /* values possible for this option are listed in opt->values */
 981         for (arg = opt->values; arg->value; arg++) {
 982                 if (!strcmp(p, arg->value)) {
 983                         if (bit_flags) {
 984                                 *bit_flags &= ~arg->clrmask;
 985                                 *bit_flags |= arg->setmask;
 986                         }
 987                         return opt->arg_required;
 988                 }
 989         }
 990
 991         reiserfs_warning(s, "super-6506",
 992                          "bad value \"%s\" for option \"%s\"\n", p,
 993                          opt->option_name);
 994         return -1;
 995 }
 996
 997 /* returns 0 if something is wrong in option string, 1 - otherwise */
 998 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 999                                   unsigned long *mount_options,
1000                                   /* after the parsing phase, contains the
1001                                      collection of bitflags defining what
1002                                      mount options were selected. */
1003                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
1004                                   char **jdev_name,
1005                                   unsigned int *commit_max_age,
1006                                   char **qf_names,
1007                                   unsigned int *qfmt)
1008 {
1009         int c;
1010         char *arg = NULL;
1011         char *pos;
1012         opt_desc_t opts[] = {
1013                 /* Compatibility stuff, so that -o notail for old setups still work */
1014                 {"tails",.arg_required = 't',.values = tails},
1015                 {"notail",.clrmask =
1016                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1017                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1018                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1019                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1020                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1021 #ifdef CONFIG_REISERFS_FS_XATTR
1022                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1023                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1024 #else
1025                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027 #endif
1028 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1029                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1030                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1031 #else
1032                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034 #endif
1035                 {.option_name = "nolog"},
1036                 {"replayonly",.setmask = 1 << REPLAYONLY},
1037                 {"block-allocator",.arg_required = 'a',.values = balloc},
1038                 {"data",.arg_required = 'd',.values = logging_mode},
1039                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1040                 {"resize",.arg_required = 'r',.values = NULL},
1041                 {"jdev",.arg_required = 'j',.values = NULL},
1042                 {"nolargeio",.arg_required = 'w',.values = NULL},
1043                 {"commit",.arg_required = 'c',.values = NULL},
1044                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1045                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1046                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1047                 {"errors",.arg_required = 'e',.values = error_actions},
1048                 {"usrjquota",.arg_required =
1049                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050                 {"grpjquota",.arg_required =
1051                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1052                 {"jqfmt",.arg_required = 'f',.values = NULL},
1053                 {.option_name = NULL}
1054         };
1055
1056         *blocks = 0;
1057         if (!options || !*options)
1058                 /* use default configuration: create tails, journaling on, no
1059                    conversion to newest format */
1060                 return 1;
1061
1062         for (pos = options; pos;) {
1063                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1064                 if (c == -1)
1065                         /* wrong option is given */
1066                         return 0;
1067
1068                 if (c == 'r') {
1069                         char *p;
1070
1071                         p = NULL;
1072                         /* "resize=NNN" or "resize=auto" */
1073
1074                         if (!strcmp(arg, "auto")) {
1075                                 /* From JFS code, to auto-get the size. */
1076                                 *blocks =
1077                                     s->s_bdev->bd_inode->i_size >> s->
1078                                     s_blocksize_bits;
1079                         } else {
1080                                 *blocks = simple_strtoul(arg, &p, 0);
1081                                 if (*p != '\0') {
1082                                         /* NNN does not look like a number */
1083                                         reiserfs_warning(s, "super-6507",
1084                                                          "bad value %s for "
1085                                                          "-oresize\n", arg);
1086                                         return 0;
1087                                 }
1088                         }
1089                 }
1090
1091                 if (c == 'c') {
1092                         char *p = NULL;
1093                         unsigned long val = simple_strtoul(arg, &p, 0);
1094                         /* commit=NNN (time in seconds) */
1095                         if (*p != '\0' || val >= (unsigned int)-1) {
1096                                 reiserfs_warning(s, "super-6508",
1097                                                  "bad value %s for -ocommit\n",
1098                                                  arg);
1099                                 return 0;
1100                         }
1101                         *commit_max_age = (unsigned int)val;
1102                 }
1103
1104                 if (c == 'w') {
1105                         reiserfs_warning(s, "super-6509", "nolargeio option "
1106                                          "is no longer supported");
1107                         return 0;
1108                 }
1109
1110                 if (c == 'j') {
1111                         if (arg && *arg && jdev_name) {
1112                                 if (*jdev_name) {       //Hm, already assigned?
1113                                         reiserfs_warning(s, "super-6510",
1114                                                          "journal device was "
1115                                                          "already specified to "
1116                                                          "be %s", *jdev_name);
1117                                         return 0;
1118                                 }
1119                                 *jdev_name = arg;
1120                         }
1121                 }
1122 #ifdef CONFIG_QUOTA
1123                 if (c == 'u' || c == 'g') {
1124                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1125
1126                         if (sb_any_quota_loaded(s) &&
1127                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1128                                 reiserfs_warning(s, "super-6511",
1129                                                  "cannot change journaled "
1130                                                  "quota options when quota "
1131                                                  "turned on.");
1132                                 return 0;
1133                         }
1134                         if (*arg) {     /* Some filename specified? */
1135                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1136                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1137                                               arg)) {
1138                                         reiserfs_warning(s, "super-6512",
1139                                                          "%s quota file "
1140                                                          "already specified.",
1141                                                          QTYPE2NAME(qtype));
1142                                         return 0;
1143                                 }
1144                                 if (strchr(arg, '/')) {
1145                                         reiserfs_warning(s, "super-6513",
1146                                                          "quotafile must be "
1147                                                          "on filesystem root.");
1148                                         return 0;
1149                                 }
1150                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1151                                 if (!qf_names[qtype]) {
1152                                         reiserfs_warning(s, "reiserfs-2502",
1153                                                          "not enough memory "
1154                                                          "for storing "
1155                                                          "quotafile name.");
1156                                         return 0;
1157                                 }
1158                                 if (qtype == USRQUOTA)
1159                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1160                                 else
1161                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1162                         } else {
1163                                 if (qf_names[qtype] !=
1164                                     REISERFS_SB(s)->s_qf_names[qtype])
1165                                         kfree(qf_names[qtype]);
1166                                 qf_names[qtype] = NULL;
1167                                 if (qtype == USRQUOTA)
1168                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1169                                 else
1170                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1171                         }
1172                 }
1173                 if (c == 'f') {
1174                         if (!strcmp(arg, "vfsold"))
1175                                 *qfmt = QFMT_VFS_OLD;
1176                         else if (!strcmp(arg, "vfsv0"))
1177                                 *qfmt = QFMT_VFS_V0;
1178                         else {
1179                                 reiserfs_warning(s, "super-6514",
1180                                                  "unknown quota format "
1181                                                  "specified.");
1182                                 return 0;
1183                         }
1184                         if (sb_any_quota_loaded(s) &&
1185                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1186                                 reiserfs_warning(s, "super-6515",
1187                                                  "cannot change journaled "
1188                                                  "quota options when quota "
1189                                                  "turned on.");
1190                                 return 0;
1191                         }
1192                 }
1193 #else
1194                 if (c == 'u' || c == 'g' || c == 'f') {
1195                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1196                                          "quota options not supported.");
1197                         return 0;
1198                 }
1199 #endif
1200         }
1201
1202 #ifdef CONFIG_QUOTA
1203         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1204             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1205                 reiserfs_warning(s, "super-6515",
1206                                  "journaled quota format not specified.");
1207                 return 0;
1208         }
1209         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1210                sb_has_quota_loaded(s, USRQUOTA)) ||
1211             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1212                sb_has_quota_loaded(s, GRPQUOTA))) {
1213                 reiserfs_warning(s, "super-6516", "quota options must "
1214                                  "be present when quota is turned on.");
1215                 return 0;
1216         }
1217 #endif
1218
1219         return 1;
1220 }
1221
1222 static void switch_data_mode(struct super_block *s, unsigned long mode)
1223 {
1224         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1225                                          (1 << REISERFS_DATA_ORDERED) |
1226                                          (1 << REISERFS_DATA_WRITEBACK));
1227         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1228 }
1229
1230 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1231 {
1232         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1233                 if (!reiserfs_data_log(s)) {
1234                         switch_data_mode(s, REISERFS_DATA_LOG);
1235                         reiserfs_info(s, "switching to journaled data mode\n");
1236                 }
1237         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1238                 if (!reiserfs_data_ordered(s)) {
1239                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1240                         reiserfs_info(s, "switching to ordered data mode\n");
1241                 }
1242         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1243                 if (!reiserfs_data_writeback(s)) {
1244                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1245                         reiserfs_info(s, "switching to writeback data mode\n");
1246                 }
1247         }
1248 }
1249
1250 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1251 {
1252         int flush = (1 << REISERFS_BARRIER_FLUSH);
1253         int none = (1 << REISERFS_BARRIER_NONE);
1254         int all_barrier = flush | none;
1255
1256         if (bits & all_barrier) {
1257                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1258                 if (bits & flush) {
1259                         REISERFS_SB(s)->s_mount_opt |= flush;
1260                         printk("reiserfs: enabling write barrier flush mode\n");
1261                 } else if (bits & none) {
1262                         REISERFS_SB(s)->s_mount_opt |= none;
1263                         printk("reiserfs: write barriers turned off\n");
1264                 }
1265         }
1266 }
1267
1268 static void handle_attrs(struct super_block *s)
1269 {
1270         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1271
1272         if (reiserfs_attrs(s)) {
1273                 if (old_format_only(s)) {
1274                         reiserfs_warning(s, "super-6517", "cannot support "
1275                                          "attributes on 3.5.x disk format");
1276                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1277                         return;
1278                 }
1279                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1280                         reiserfs_warning(s, "super-6518", "cannot support "
1281                                          "attributes until flag is set in "
1282                                          "super-block");
1283                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1284                 }
1285         }
1286 }
1287
1288 #ifdef CONFIG_QUOTA
1289 static void handle_quota_files(struct super_block *s, char **qf_names,
1290                                unsigned int *qfmt)
1291 {
1292         int i;
1293
1294         for (i = 0; i < MAXQUOTAS; i++) {
1295                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1296                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1297                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1298         }
1299         if (*qfmt)
1300                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1301 }
1302 #endif
1303
1304 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1305 {
1306         struct reiserfs_super_block *rs;
1307         struct reiserfs_transaction_handle th;
1308         unsigned long blocks;
1309         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1310         unsigned long safe_mask = 0;
1311         unsigned int commit_max_age = (unsigned int)-1;
1312         struct reiserfs_journal *journal = SB_JOURNAL(s);
1313         char *new_opts = kstrdup(arg, GFP_KERNEL);
1314         int err;
1315         char *qf_names[MAXQUOTAS];
1316         unsigned int qfmt = 0;
1317 #ifdef CONFIG_QUOTA
1318         int i;
1319 #endif
1320
1321         reiserfs_write_lock(s);
1322
1323 #ifdef CONFIG_QUOTA
1324         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1325 #endif
1326
1327         rs = SB_DISK_SUPER_BLOCK(s);
1328
1329         if (!reiserfs_parse_options
1330             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1331             qf_names, &qfmt)) {
1332 #ifdef CONFIG_QUOTA
1333                 for (i = 0; i < MAXQUOTAS; i++)
1334                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1335                                 kfree(qf_names[i]);
1336 #endif
1337                 err = -EINVAL;
1338                 goto out_err_unlock;
1339         }
1340 #ifdef CONFIG_QUOTA
1341         handle_quota_files(s, qf_names, &qfmt);
1342 #endif
1343
1344         handle_attrs(s);
1345
1346         /* Add options that are safe here */
1347         safe_mask |= 1 << REISERFS_SMALLTAIL;
1348         safe_mask |= 1 << REISERFS_LARGETAIL;
1349         safe_mask |= 1 << REISERFS_NO_BORDER;
1350         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1351         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1352         safe_mask |= 1 << REISERFS_TEST4;
1353         safe_mask |= 1 << REISERFS_ATTRS;
1354         safe_mask |= 1 << REISERFS_XATTRS_USER;
1355         safe_mask |= 1 << REISERFS_POSIXACL;
1356         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1357         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1358         safe_mask |= 1 << REISERFS_ERROR_RO;
1359         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1360         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1361         safe_mask |= 1 << REISERFS_USRQUOTA;
1362         safe_mask |= 1 << REISERFS_GRPQUOTA;
1363
1364         /* Update the bitmask, taking care to keep
1365          * the bits we're not allowed to change here */
1366         REISERFS_SB(s)->s_mount_opt =
1367             (REISERFS_SB(s)->
1368              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1369
1370         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1371                 journal->j_max_commit_age = commit_max_age;
1372                 journal->j_max_trans_age = commit_max_age;
1373         } else if (commit_max_age == 0) {
1374                 /* 0 means restore defaults. */
1375                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1376                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1377         }
1378
1379         if (blocks) {
1380                 err = reiserfs_resize(s, blocks);
1381                 if (err != 0)
1382                         goto out_err_unlock;
1383         }
1384
1385         if (*mount_flags & MS_RDONLY) {
1386                 reiserfs_write_unlock(s);
1387                 reiserfs_xattr_init(s, *mount_flags);
1388                 /* remount read-only */
1389                 if (s->s_flags & MS_RDONLY)
1390                         /* it is read-only already */
1391                         goto out_ok_unlocked;
1392
1393                 err = dquot_suspend(s, -1);
1394                 if (err < 0)
1395                         goto out_err;
1396
1397                 /* try to remount file system with read-only permissions */
1398                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1399                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1400                         goto out_ok_unlocked;
1401                 }
1402
1403                 reiserfs_write_lock(s);
1404
1405                 err = journal_begin(&th, s, 10);
1406                 if (err)
1407                         goto out_err_unlock;
1408
1409                 /* Mounting a rw partition read-only. */
1410                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1411                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1412                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1413         } else {
1414                 /* remount read-write */
1415                 if (!(s->s_flags & MS_RDONLY)) {
1416                         reiserfs_write_unlock(s);
1417                         reiserfs_xattr_init(s, *mount_flags);
1418                         goto out_ok_unlocked;   /* We are read-write already */
1419                 }
1420
1421                 if (reiserfs_is_journal_aborted(journal)) {
1422                         err = journal->j_errno;
1423                         goto out_err_unlock;
1424                 }
1425
1426                 handle_data_mode(s, mount_options);
1427                 handle_barrier_mode(s, mount_options);
1428                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1429                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1430                 err = journal_begin(&th, s, 10);
1431                 if (err)
1432                         goto out_err_unlock;
1433
1434                 /* Mount a partition which is read-only, read-write */
1435                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1436                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1437                 s->s_flags &= ~MS_RDONLY;
1438                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1439                 if (!old_format_only(s))
1440                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1441                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1442                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1443                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1444         }
1445         /* this will force a full flush of all journal lists */
1446         SB_JOURNAL(s)->j_must_wait = 1;
1447         err = journal_end(&th, s, 10);
1448         if (err)
1449                 goto out_err_unlock;
1450
1451         reiserfs_write_unlock(s);
1452         if (!(*mount_flags & MS_RDONLY)) {
1453                 dquot_resume(s, -1);
1454                 reiserfs_write_lock(s);
1455                 finish_unfinished(s);
1456                 reiserfs_write_unlock(s);
1457                 reiserfs_xattr_init(s, *mount_flags);
1458         }
1459
1460 out_ok_unlocked:
1461         replace_mount_options(s, new_opts);
1462         return 0;
1463
1464 out_err_unlock:
1465         reiserfs_write_unlock(s);
1466 out_err:
1467         kfree(new_opts);
1468         return err;
1469 }
1470
1471 static int read_super_block(struct super_block *s, int offset)
1472 {
1473         struct buffer_head *bh;
1474         struct reiserfs_super_block *rs;
1475         int fs_blocksize;
1476
1477         bh = sb_bread(s, offset / s->s_blocksize);
1478         if (!bh) {
1479                 reiserfs_warning(s, "sh-2006",
1480                                  "bread failed (dev %s, block %lu, size %lu)",
1481                                  s->s_id, offset / s->s_blocksize,
1482                                  s->s_blocksize);
1483                 return 1;
1484         }
1485
1486         rs = (struct reiserfs_super_block *)bh->b_data;
1487         if (!is_any_reiserfs_magic_string(rs)) {
1488                 brelse(bh);
1489                 return 1;
1490         }
1491         //
1492         // ok, reiserfs signature (old or new) found in at the given offset
1493         //
1494         fs_blocksize = sb_blocksize(rs);
1495         brelse(bh);
1496         sb_set_blocksize(s, fs_blocksize);
1497
1498         bh = sb_bread(s, offset / s->s_blocksize);
1499         if (!bh) {
1500                 reiserfs_warning(s, "sh-2007",
1501                                  "bread failed (dev %s, block %lu, size %lu)",
1502                                  s->s_id, offset / s->s_blocksize,
1503                                  s->s_blocksize);
1504                 return 1;
1505         }
1506
1507         rs = (struct reiserfs_super_block *)bh->b_data;
1508         if (sb_blocksize(rs) != s->s_blocksize) {
1509                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1510                                  "filesystem on (dev %s, block %Lu, size %lu)",
1511                                  s->s_id,
1512                                  (unsigned long long)bh->b_blocknr,
1513                                  s->s_blocksize);
1514                 brelse(bh);
1515                 return 1;
1516         }
1517
1518         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1519                 brelse(bh);
1520                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1521                                  "--rebuild-tree run detected. Please run\n"
1522                                  "reiserfsck --rebuild-tree and wait for a "
1523                                  "completion. If that fails\n"
1524                                  "get newer reiserfsprogs package");
1525                 return 1;
1526         }
1527
1528         SB_BUFFER_WITH_SB(s) = bh;
1529         SB_DISK_SUPER_BLOCK(s) = rs;
1530
1531         if (is_reiserfs_jr(rs)) {
1532                 /* magic is of non-standard journal filesystem, look at s_version to
1533                    find which format is in use */
1534                 if (sb_version(rs) == REISERFS_VERSION_2)
1535                         reiserfs_info(s, "found reiserfs format \"3.6\""
1536                                       " with non-standard journal\n");
1537                 else if (sb_version(rs) == REISERFS_VERSION_1)
1538                         reiserfs_info(s, "found reiserfs format \"3.5\""
1539                                       " with non-standard journal\n");
1540                 else {
1541                         reiserfs_warning(s, "sh-2012", "found unknown "
1542                                          "format \"%u\" of reiserfs with "
1543                                          "non-standard magic", sb_version(rs));
1544                         return 1;
1545                 }
1546         } else
1547                 /* s_version of standard format may contain incorrect information,
1548                    so we just look at the magic string */
1549                 reiserfs_info(s,
1550                               "found reiserfs format \"%s\" with standard journal\n",
1551                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1552
1553         s->s_op = &reiserfs_sops;
1554         s->s_export_op = &reiserfs_export_ops;
1555 #ifdef CONFIG_QUOTA
1556         s->s_qcop = &reiserfs_qctl_operations;
1557         s->dq_op = &reiserfs_quota_operations;
1558 #endif
1559
1560         /* new format is limited by the 32 bit wide i_blocks field, want to
1561          ** be one full block below that.
1562          */
1563         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1564         return 0;
1565 }
1566
1567 /* after journal replay, reread all bitmap and super blocks */
1568 static int reread_meta_blocks(struct super_block *s)
1569 {
1570         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1571         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1572         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1573                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1574                 return 1;
1575         }
1576
1577         return 0;
1578 }
1579
1580 /////////////////////////////////////////////////////
1581 // hash detection stuff
1582
1583 // if root directory is empty - we set default - Yura's - hash and
1584 // warn about it
1585 // FIXME: we look for only one name in a directory. If tea and yura
1586 // bith have the same value - we ask user to send report to the
1587 // mailing list
1588 static __u32 find_hash_out(struct super_block *s)
1589 {
1590         int retval;
1591         struct inode *inode;
1592         struct cpu_key key;
1593         INITIALIZE_PATH(path);
1594         struct reiserfs_dir_entry de;
1595         __u32 hash = DEFAULT_HASH;
1596
1597         inode = s->s_root->d_inode;
1598
1599         do {                    // Some serious "goto"-hater was there ;)
1600                 u32 teahash, r5hash, yurahash;
1601
1602                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1603                 retval = search_by_entry_key(s, &key, &path, &de);
1604                 if (retval == IO_ERROR) {
1605                         pathrelse(&path);
1606                         return UNSET_HASH;
1607                 }
1608                 if (retval == NAME_NOT_FOUND)
1609                         de.de_entry_num--;
1610                 set_de_name_and_namelen(&de);
1611                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1612                         /* allow override in this case */
1613                         if (reiserfs_rupasov_hash(s)) {
1614                                 hash = YURA_HASH;
1615                         }
1616                         reiserfs_info(s, "FS seems to be empty, autodetect "
1617                                          "is using the default hash\n");
1618                         break;
1619                 }
1620                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1621                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1622                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1623                 if (((teahash == r5hash)
1624                      &&
1625                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1626                       == r5hash)) || ((teahash == yurahash)
1627                                       && (yurahash ==
1628                                           GET_HASH_VALUE(deh_offset
1629                                                          (&
1630                                                           (de.
1631                                                            de_deh[de.
1632                                                                   de_entry_num])))))
1633                     || ((r5hash == yurahash)
1634                         && (yurahash ==
1635                             GET_HASH_VALUE(deh_offset
1636                                            (&(de.de_deh[de.de_entry_num])))))) {
1637                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1638                                          "automatically detect hash function. "
1639                                          "Please mount with -o "
1640                                          "hash={tea,rupasov,r5}");
1641                         hash = UNSET_HASH;
1642                         break;
1643                 }
1644                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1645                     yurahash)
1646                         hash = YURA_HASH;
1647                 else if (GET_HASH_VALUE
1648                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1649                         hash = TEA_HASH;
1650                 else if (GET_HASH_VALUE
1651                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1652                         hash = R5_HASH;
1653                 else {
1654                         reiserfs_warning(s, "reiserfs-2506",
1655                                          "Unrecognised hash function");
1656                         hash = UNSET_HASH;
1657                 }
1658         } while (0);
1659
1660         pathrelse(&path);
1661         return hash;
1662 }
1663
1664 // finds out which hash names are sorted with
1665 static int what_hash(struct super_block *s)
1666 {
1667         __u32 code;
1668
1669         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1670
1671         /* reiserfs_hash_detect() == true if any of the hash mount options
1672          ** were used.  We must check them to make sure the user isn't
1673          ** using a bad hash value
1674          */
1675         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1676                 code = find_hash_out(s);
1677
1678         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1679                 /* detection has found the hash, and we must check against the
1680                  ** mount options
1681                  */
1682                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1683                         reiserfs_warning(s, "reiserfs-2507",
1684                                          "Error, %s hash detected, "
1685                                          "unable to force rupasov hash",
1686                                          reiserfs_hashname(code));
1687                         code = UNSET_HASH;
1688                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1689                         reiserfs_warning(s, "reiserfs-2508",
1690                                          "Error, %s hash detected, "
1691                                          "unable to force tea hash",
1692                                          reiserfs_hashname(code));
1693                         code = UNSET_HASH;
1694                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1695                         reiserfs_warning(s, "reiserfs-2509",
1696                                          "Error, %s hash detected, "
1697                                          "unable to force r5 hash",
1698                                          reiserfs_hashname(code));
1699                         code = UNSET_HASH;
1700                 }
1701         } else {
1702                 /* find_hash_out was not called or could not determine the hash */
1703                 if (reiserfs_rupasov_hash(s)) {
1704                         code = YURA_HASH;
1705                 } else if (reiserfs_tea_hash(s)) {
1706                         code = TEA_HASH;
1707                 } else if (reiserfs_r5_hash(s)) {
1708                         code = R5_HASH;
1709                 }
1710         }
1711
1712         /* if we are mounted RW, and we have a new valid hash code, update
1713          ** the super
1714          */
1715         if (code != UNSET_HASH &&
1716             !(s->s_flags & MS_RDONLY) &&
1717             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1718                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1719         }
1720         return code;
1721 }
1722
1723 // return pointer to appropriate function
1724 static hashf_t hash_function(struct super_block *s)
1725 {
1726         switch (what_hash(s)) {
1727         case TEA_HASH:
1728                 reiserfs_info(s, "Using tea hash to sort names\n");
1729                 return keyed_hash;
1730         case YURA_HASH:
1731                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1732                 return yura_hash;
1733         case R5_HASH:
1734                 reiserfs_info(s, "Using r5 hash to sort names\n");
1735                 return r5_hash;
1736         }
1737         return NULL;
1738 }
1739
1740 // this is used to set up correct value for old partitions
1741 static int function2code(hashf_t func)
1742 {
1743         if (func == keyed_hash)
1744                 return TEA_HASH;
1745         if (func == yura_hash)
1746                 return YURA_HASH;
1747         if (func == r5_hash)
1748                 return R5_HASH;
1749
1750         BUG();                  // should never happen
1751
1752         return 0;
1753 }
1754
1755 #define SWARN(silent, s, id, ...)                       \
1756         if (!(silent))                          \
1757                 reiserfs_warning(s, id, __VA_ARGS__)
1758
1759 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1760 {
1761         struct inode *root_inode;
1762         struct reiserfs_transaction_handle th;
1763         int old_format = 0;
1764         unsigned long blocks;
1765         unsigned int commit_max_age = 0;
1766         int jinit_done = 0;
1767         struct reiserfs_iget_args args;
1768         struct reiserfs_super_block *rs;
1769         char *jdev_name;
1770         struct reiserfs_sb_info *sbi;
1771         int errval = -EINVAL;
1772         char *qf_names[MAXQUOTAS] = {};
1773         unsigned int qfmt = 0;
1774
1775         save_mount_options(s, data);
1776
1777         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1778         if (!sbi)
1779                 return -ENOMEM;
1780         s->s_fs_info = sbi;
1781         /* Set default values for options: non-aggressive tails, RO on errors */
1782         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1783         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1784         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1785         /* no preallocation minimum, be smart in
1786            reiserfs_file_write instead */
1787         sbi->s_alloc_options.preallocmin = 0;
1788         /* Preallocate by 16 blocks (17-1) at once */
1789         sbi->s_alloc_options.preallocsize = 17;
1790         /* setup default block allocator options */
1791         reiserfs_init_alloc_options(s);
1792
1793         spin_lock_init(&sbi->old_work_lock);
1794         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1795         mutex_init(&sbi->lock);
1796         sbi->lock_depth = -1;
1797
1798         jdev_name = NULL;
1799         if (reiserfs_parse_options
1800             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1801              &commit_max_age, qf_names, &qfmt) == 0) {
1802                 goto error_unlocked;
1803         }
1804         if (jdev_name && jdev_name[0]) {
1805                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1806                 if (!sbi->s_jdev) {
1807                         SWARN(silent, s, "", "Cannot allocate memory for "
1808                                 "journal device name");
1809                         goto error;
1810                 }
1811         }
1812 #ifdef CONFIG_QUOTA
1813         handle_quota_files(s, qf_names, &qfmt);
1814 #endif
1815
1816         if (blocks) {
1817                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1818                 goto error_unlocked;
1819         }
1820
1821         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1822         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1823                 old_format = 1;
1824         /* try new format (64-th 1k block), which can contain reiserfs super block */
1825         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1826                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1827                       s->s_id);
1828                 goto error_unlocked;
1829         }
1830
1831         rs = SB_DISK_SUPER_BLOCK(s);
1832         /* Let's do basic sanity check to verify that underlying device is not
1833            smaller than the filesystem. If the check fails then abort and scream,
1834            because bad stuff will happen otherwise. */
1835         if (s->s_bdev && s->s_bdev->bd_inode
1836             && i_size_read(s->s_bdev->bd_inode) <
1837             sb_block_count(rs) * sb_blocksize(rs)) {
1838                 SWARN(silent, s, "", "Filesystem cannot be "
1839                       "mounted because it is bigger than the device");
1840                 SWARN(silent, s, "", "You may need to run fsck "
1841                       "or increase size of your LVM partition");
1842                 SWARN(silent, s, "", "Or may be you forgot to "
1843                       "reboot after fdisk when it told you to");
1844                 goto error_unlocked;
1845         }
1846
1847         sbi->s_mount_state = SB_REISERFS_STATE(s);
1848         sbi->s_mount_state = REISERFS_VALID_FS;
1849
1850         if ((errval = reiserfs_init_bitmap_cache(s))) {
1851                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1852                 goto error_unlocked;
1853         }
1854
1855         errval = -EINVAL;
1856 #ifdef CONFIG_REISERFS_CHECK
1857         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1858         SWARN(silent, s, "", "- it is slow mode for debugging.");
1859 #endif
1860
1861         /* make data=ordered the default */
1862         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1863             !reiserfs_data_writeback(s)) {
1864                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1865         }
1866
1867         if (reiserfs_data_log(s)) {
1868                 reiserfs_info(s, "using journaled data mode\n");
1869         } else if (reiserfs_data_ordered(s)) {
1870                 reiserfs_info(s, "using ordered data mode\n");
1871         } else {
1872                 reiserfs_info(s, "using writeback data mode\n");
1873         }
1874         if (reiserfs_barrier_flush(s)) {
1875                 printk("reiserfs: using flush barriers\n");
1876         }
1877
1878         // set_device_ro(s->s_dev, 1) ;
1879         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1880                 SWARN(silent, s, "sh-2022",
1881                       "unable to initialize journal space");
1882                 goto error_unlocked;
1883         } else {
1884                 jinit_done = 1; /* once this is set, journal_release must be called
1885                                  ** if we error out of the mount
1886                                  */
1887         }
1888
1889         if (reread_meta_blocks(s)) {
1890                 SWARN(silent, s, "jmacd-9",
1891                       "unable to reread meta blocks after journal init");
1892                 goto error_unlocked;
1893         }
1894
1895         if (replay_only(s))
1896                 goto error_unlocked;
1897
1898         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1899                 SWARN(silent, s, "clm-7000",
1900                       "Detected readonly device, marking FS readonly");
1901                 s->s_flags |= MS_RDONLY;
1902         }
1903         args.objectid = REISERFS_ROOT_OBJECTID;
1904         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1905         root_inode =
1906             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1907                          reiserfs_init_locked_inode, (void *)(&args));
1908         if (!root_inode) {
1909                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1910                 goto error_unlocked;
1911         }
1912
1913         /*
1914          * This path assumed to be called with the BKL in the old times.
1915          * Now we have inherited the big reiserfs lock from it and many
1916          * reiserfs helpers called in the mount path and elsewhere require
1917          * this lock to be held even if it's not always necessary. Let's be
1918          * conservative and hold it early. The window can be reduced after
1919          * careful review of the code.
1920          */
1921         reiserfs_write_lock(s);
1922
1923         if (root_inode->i_state & I_NEW) {
1924                 reiserfs_read_locked_inode(root_inode, &args);
1925                 unlock_new_inode(root_inode);
1926         }
1927
1928         s->s_root = d_make_root(root_inode);
1929         if (!s->s_root)
1930                 goto error;
1931         // define and initialize hash function
1932         sbi->s_hash_function = hash_function(s);
1933         if (sbi->s_hash_function == NULL) {
1934                 dput(s->s_root);
1935                 s->s_root = NULL;
1936                 goto error;
1937         }
1938
1939         if (is_reiserfs_3_5(rs)
1940             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1941                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1942         else if (old_format)
1943                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1944         else
1945                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1946
1947         if (!(s->s_flags & MS_RDONLY)) {
1948
1949                 errval = journal_begin(&th, s, 1);
1950                 if (errval) {
1951                         dput(s->s_root);
1952                         s->s_root = NULL;
1953                         goto error;
1954                 }
1955                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1956
1957                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1958                 set_sb_fs_state(rs, 0);
1959
1960                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1961                  * case, but older revisions can't. This will cause the
1962                  * file system to fail mount on those older implementations,
1963                  * avoiding corruption. -jeffm */
1964                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1965                     sb_bmap_nr(rs) != 0) {
1966                         reiserfs_warning(s, "super-2030", "This file system "
1967                                         "claims to use %u bitmap blocks in "
1968                                         "its super block, but requires %u. "
1969                                         "Clearing to zero.", sb_bmap_nr(rs),
1970                                         reiserfs_bmap_count(s));
1971
1972                         set_sb_bmap_nr(rs, 0);
1973                 }
1974
1975                 if (old_format_only(s)) {
1976                         /* filesystem of format 3.5 either with standard or non-standard
1977                            journal */
1978                         if (convert_reiserfs(s)) {
1979                                 /* and -o conv is given */
1980                                 if (!silent)
1981                                         reiserfs_info(s,
1982                                                       "converting 3.5 filesystem to the 3.6 format");
1983
1984                                 if (is_reiserfs_3_5(rs))
1985                                         /* put magic string of 3.6 format. 2.2 will not be able to
1986                                            mount this filesystem anymore */
1987                                         memcpy(rs->s_v1.s_magic,
1988                                                reiserfs_3_6_magic_string,
1989                                                sizeof
1990                                                (reiserfs_3_6_magic_string));
1991
1992                                 set_sb_version(rs, REISERFS_VERSION_2);
1993                                 reiserfs_convert_objectid_map_v1(s);
1994                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1995                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1996                         } else if (!silent) {
1997                                 reiserfs_info(s, "using 3.5.x disk format\n");
1998                         }
1999                 } else
2000                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2001
2002
2003                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2004                 errval = journal_end(&th, s, 1);
2005                 if (errval) {
2006                         dput(s->s_root);
2007                         s->s_root = NULL;
2008                         goto error;
2009                 }
2010
2011                 reiserfs_write_unlock(s);
2012                 if ((errval = reiserfs_lookup_privroot(s)) ||
2013                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2014                         dput(s->s_root);
2015                         s->s_root = NULL;
2016                         goto error_unlocked;
2017                 }
2018                 reiserfs_write_lock(s);
2019
2020                 /* look for files which were to be removed in previous session */
2021                 finish_unfinished(s);
2022         } else {
2023                 if (old_format_only(s) && !silent) {
2024                         reiserfs_info(s, "using 3.5.x disk format\n");
2025                 }
2026
2027                 reiserfs_write_unlock(s);
2028                 if ((errval = reiserfs_lookup_privroot(s)) ||
2029                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2030                         dput(s->s_root);
2031                         s->s_root = NULL;
2032                         goto error_unlocked;
2033                 }
2034                 reiserfs_write_lock(s);
2035         }
2036         // mark hash in super block: it could be unset. overwrite should be ok
2037         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2038
2039         handle_attrs(s);
2040
2041         reiserfs_proc_info_init(s);
2042
2043         init_waitqueue_head(&(sbi->s_wait));
2044         spin_lock_init(&sbi->bitmap_lock);
2045
2046         reiserfs_write_unlock(s);
2047
2048         return (0);
2049
2050 error:
2051         reiserfs_write_unlock(s);
2052
2053 error_unlocked:
2054         /* kill the commit thread, free journal ram */
2055         if (jinit_done) {
2056                 reiserfs_write_lock(s);
2057                 journal_release_error(NULL, s);
2058                 reiserfs_write_unlock(s);
2059         }
2060
2061         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2062
2063         reiserfs_free_bitmap_cache(s);
2064         if (SB_BUFFER_WITH_SB(s))
2065                 brelse(SB_BUFFER_WITH_SB(s));
2066 #ifdef CONFIG_QUOTA
2067         {
2068                 int j;
2069                 for (j = 0; j < MAXQUOTAS; j++)
2070                         kfree(qf_names[j]);
2071         }
2072 #endif
2073         kfree(sbi);
2074
2075         s->s_fs_info = NULL;
2076         return errval;
2077 }
2078
2079 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2080 {
2081         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2082
2083         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2084         buf->f_bfree = sb_free_blocks(rs);
2085         buf->f_bavail = buf->f_bfree;
2086         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2087         buf->f_bsize = dentry->d_sb->s_blocksize;
2088         /* changed to accommodate gcc folks. */
2089         buf->f_type = REISERFS_SUPER_MAGIC;
2090         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2091         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2092                                 sizeof(rs->s_uuid)/2);
2093
2094         return 0;
2095 }
2096
2097 #ifdef CONFIG_QUOTA
2098 static int reiserfs_write_dquot(struct dquot *dquot)
2099 {
2100         struct reiserfs_transaction_handle th;
2101         int ret, err;
2102         int depth;
2103
2104         reiserfs_write_lock(dquot->dq_sb);
2105         ret =
2106             journal_begin(&th, dquot->dq_sb,
2107                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2108         if (ret)
2109                 goto out;
2110         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2111         ret = dquot_commit(dquot);
2112         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2113         err =
2114             journal_end(&th, dquot->dq_sb,
2115                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2116         if (!ret && err)
2117                 ret = err;
2118 out:
2119         reiserfs_write_unlock(dquot->dq_sb);
2120         return ret;
2121 }
2122
2123 static int reiserfs_acquire_dquot(struct dquot *dquot)
2124 {
2125         struct reiserfs_transaction_handle th;
2126         int ret, err;
2127         int depth;
2128
2129         reiserfs_write_lock(dquot->dq_sb);
2130         ret =
2131             journal_begin(&th, dquot->dq_sb,
2132                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2133         if (ret)
2134                 goto out;
2135         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2136         ret = dquot_acquire(dquot);
2137         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2138         err =
2139             journal_end(&th, dquot->dq_sb,
2140                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2141         if (!ret && err)
2142                 ret = err;
2143 out:
2144         reiserfs_write_unlock(dquot->dq_sb);
2145         return ret;
2146 }
2147
2148 static int reiserfs_release_dquot(struct dquot *dquot)
2149 {
2150         struct reiserfs_transaction_handle th;
2151         int ret, err;
2152
2153         reiserfs_write_lock(dquot->dq_sb);
2154         ret =
2155             journal_begin(&th, dquot->dq_sb,
2156                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2157         reiserfs_write_unlock(dquot->dq_sb);
2158         if (ret) {
2159                 /* Release dquot anyway to avoid endless cycle in dqput() */
2160                 dquot_release(dquot);
2161                 goto out;
2162         }
2163         ret = dquot_release(dquot);
2164         reiserfs_write_lock(dquot->dq_sb);
2165         err =
2166             journal_end(&th, dquot->dq_sb,
2167                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2168         if (!ret && err)
2169                 ret = err;
2170         reiserfs_write_unlock(dquot->dq_sb);
2171 out:
2172         return ret;
2173 }
2174
2175 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2176 {
2177         /* Are we journaling quotas? */
2178         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2179             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2180                 dquot_mark_dquot_dirty(dquot);
2181                 return reiserfs_write_dquot(dquot);
2182         } else
2183                 return dquot_mark_dquot_dirty(dquot);
2184 }
2185
2186 static int reiserfs_write_info(struct super_block *sb, int type)
2187 {
2188         struct reiserfs_transaction_handle th;
2189         int ret, err;
2190         int depth;
2191
2192         /* Data block + inode block */
2193         reiserfs_write_lock(sb);
2194         ret = journal_begin(&th, sb, 2);
2195         if (ret)
2196                 goto out;
2197         depth = reiserfs_write_unlock_nested(sb);
2198         ret = dquot_commit_info(sb, type);
2199         reiserfs_write_lock_nested(sb, depth);
2200         err = journal_end(&th, sb, 2);
2201         if (!ret && err)
2202                 ret = err;
2203 out:
2204         reiserfs_write_unlock(sb);
2205         return ret;
2206 }
2207
2208 /*
2209  * Turn on quotas during mount time - we need to find the quota file and such...
2210  */
2211 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2212 {
2213         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2214                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2215 }
2216
2217 /*
2218  * Standard function to be called on quota_on
2219  */
2220 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2221                              struct path *path)
2222 {
2223         int err;
2224         struct inode *inode;
2225         struct reiserfs_transaction_handle th;
2226         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2227
2228         reiserfs_write_lock(sb);
2229         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2230                 err = -EINVAL;
2231                 goto out;
2232         }
2233
2234         /* Quotafile not on the same filesystem? */
2235         if (path->dentry->d_sb != sb) {
2236                 err = -EXDEV;
2237                 goto out;
2238         }
2239         inode = path->dentry->d_inode;
2240         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2241         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2242                 err = reiserfs_unpack(inode, NULL);
2243                 if (err) {
2244                         reiserfs_warning(sb, "super-6520",
2245                                 "Unpacking tail of quota file failed"
2246                                 " (%d). Cannot turn on quotas.", err);
2247                         err = -EINVAL;
2248                         goto out;
2249                 }
2250                 mark_inode_dirty(inode);
2251         }
2252         /* Journaling quota? */
2253         if (REISERFS_SB(sb)->s_qf_names[type]) {
2254                 /* Quotafile not of fs root? */
2255                 if (path->dentry->d_parent != sb->s_root)
2256                         reiserfs_warning(sb, "super-6521",
2257                                  "Quota file not on filesystem root. "
2258                                  "Journalled quota will not work.");
2259         }
2260
2261         /*
2262          * When we journal data on quota file, we have to flush journal to see
2263          * all updates to the file when we bypass pagecache...
2264          */
2265         if (reiserfs_file_data_log(inode)) {
2266                 /* Just start temporary transaction and finish it */
2267                 err = journal_begin(&th, sb, 1);
2268                 if (err)
2269                         goto out;
2270                 err = journal_end_sync(&th, sb, 1);
2271                 if (err)
2272                         goto out;
2273         }
2274         reiserfs_write_unlock(sb);
2275         return dquot_quota_on(sb, type, format_id, path);
2276 out:
2277         reiserfs_write_unlock(sb);
2278         return err;
2279 }
2280
2281 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2282  * acquiring the locks... As quota files are never truncated and quota code
2283  * itself serializes the operations (and no one else should touch the files)
2284  * we don't have to be afraid of races */
2285 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2286                                    size_t len, loff_t off)
2287 {
2288         struct inode *inode = sb_dqopt(sb)->files[type];
2289         unsigned long blk = off >> sb->s_blocksize_bits;
2290         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2291         size_t toread;
2292         struct buffer_head tmp_bh, *bh;
2293         loff_t i_size = i_size_read(inode);
2294
2295         if (off > i_size)
2296                 return 0;
2297         if (off + len > i_size)
2298                 len = i_size - off;
2299         toread = len;
2300         while (toread > 0) {
2301                 tocopy =
2302                     sb->s_blocksize - offset <
2303                     toread ? sb->s_blocksize - offset : toread;
2304                 tmp_bh.b_state = 0;
2305                 /* Quota files are without tails so we can safely use this function */
2306                 reiserfs_write_lock(sb);
2307                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2308                 reiserfs_write_unlock(sb);
2309                 if (err)
2310                         return err;
2311                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2312                         memset(data, 0, tocopy);
2313                 else {
2314                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2315                         if (!bh)
2316                                 return -EIO;
2317                         memcpy(data, bh->b_data + offset, tocopy);
2318                         brelse(bh);
2319                 }
2320                 offset = 0;
2321                 toread -= tocopy;
2322                 data += tocopy;
2323                 blk++;
2324         }
2325         return len;
2326 }
2327
2328 /* Write to quotafile (we know the transaction is already started and has
2329  * enough credits) */
2330 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2331                                     const char *data, size_t len, loff_t off)
2332 {
2333         struct inode *inode = sb_dqopt(sb)->files[type];
2334         unsigned long blk = off >> sb->s_blocksize_bits;
2335         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2336         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2337         size_t towrite = len;
2338         struct buffer_head tmp_bh, *bh;
2339
2340         if (!current->journal_info) {
2341                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2342                         " cancelled because transaction is not started.\n",
2343                         (unsigned long long)off, (unsigned long long)len);
2344                 return -EIO;
2345         }
2346         while (towrite > 0) {
2347                 tocopy = sb->s_blocksize - offset < towrite ?
2348                     sb->s_blocksize - offset : towrite;
2349                 tmp_bh.b_state = 0;
2350                 reiserfs_write_lock(sb);
2351                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2352                 reiserfs_write_unlock(sb);
2353                 if (err)
2354                         goto out;
2355                 if (offset || tocopy != sb->s_blocksize)
2356                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2357                 else
2358                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2359                 if (!bh) {
2360                         err = -EIO;
2361                         goto out;
2362                 }
2363                 lock_buffer(bh);
2364                 memcpy(bh->b_data + offset, data, tocopy);
2365                 flush_dcache_page(bh->b_page);
2366                 set_buffer_uptodate(bh);
2367                 unlock_buffer(bh);
2368                 reiserfs_write_lock(sb);
2369                 reiserfs_prepare_for_journal(sb, bh, 1);
2370                 journal_mark_dirty(current->journal_info, sb, bh);
2371                 if (!journal_quota)
2372                         reiserfs_add_ordered_list(inode, bh);
2373                 reiserfs_write_unlock(sb);
2374                 brelse(bh);
2375                 offset = 0;
2376                 towrite -= tocopy;
2377                 data += tocopy;
2378                 blk++;
2379         }
2380 out:
2381         if (len == towrite)
2382                 return err;
2383         if (inode->i_size < off + len - towrite)
2384                 i_size_write(inode, off + len - towrite);
2385         inode->i_version++;
2386         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2387         mark_inode_dirty(inode);
2388         return len - towrite;
2389 }
2390
2391 #endif
2392
2393 static struct dentry *get_super_block(struct file_system_type *fs_type,
2394                            int flags, const char *dev_name,
2395                            void *data)
2396 {
2397         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2398 }
2399
2400 static int __init init_reiserfs_fs(void)
2401 {
2402         int ret;
2403
2404         if ((ret = init_inodecache())) {
2405                 return ret;
2406         }
2407
2408         reiserfs_proc_info_global_init();
2409
2410         ret = register_filesystem(&reiserfs_fs_type);
2411
2412         if (ret == 0) {
2413                 return 0;
2414         }
2415
2416         reiserfs_proc_info_global_done();
2417         destroy_inodecache();
2418
2419         return ret;
2420 }
2421
2422 static void __exit exit_reiserfs_fs(void)
2423 {
2424         reiserfs_proc_info_global_done();
2425         unregister_filesystem(&reiserfs_fs_type);
2426         destroy_inodecache();
2427 }
2428
2429 struct file_system_type reiserfs_fs_type = {
2430         .owner = THIS_MODULE,
2431         .name = "reiserfs",
2432         .mount = get_super_block,
2433         .kill_sb = reiserfs_kill_sb,
2434         .fs_flags = FS_REQUIRES_DEV,
2435 };
2436 MODULE_ALIAS_FS("reiserfs");
2437
2438 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2439 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2440 MODULE_LICENSE("GPL");
2441
2442 module_init(init_reiserfs_fs);
2443 module_exit(exit_reiserfs_fs);