kernel/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 <linux/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))
  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         /*
 104          * Avoid scheduling flush when sb is being shut down. It can race
 105          * with journal shutdown and free still queued delayed work.
 106          */
 107         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 108                 return;
 109
 110         spin_lock(&sbi->old_work_lock);
 111         if (!sbi->work_queued) {
 112                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 113                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 114                 sbi->work_queued = 1;
 115         }
 116         spin_unlock(&sbi->old_work_lock);
 117 }
 118
 119 static void cancel_old_flush(struct super_block *s)
 120 {
 121         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 122
 123         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 124         spin_lock(&sbi->old_work_lock);
 125         sbi->work_queued = 0;
 126         spin_unlock(&sbi->old_work_lock);
 127 }
 128
 129 static int reiserfs_freeze(struct super_block *s)
 130 {
 131         struct reiserfs_transaction_handle th;
 132
 133         cancel_old_flush(s);
 134
 135         reiserfs_write_lock(s);
 136         if (!(s->s_flags & MS_RDONLY)) {
 137                 int err = journal_begin(&th, s, 1);
 138                 if (err) {
 139                         reiserfs_block_writes(&th);
 140                 } else {
 141                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 142                                                      1);
 143                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 144                         reiserfs_block_writes(&th);
 145                         journal_end_sync(&th);
 146                 }
 147         }
 148         reiserfs_write_unlock(s);
 149         return 0;
 150 }
 151
 152 static int reiserfs_unfreeze(struct super_block *s)
 153 {
 154         reiserfs_allow_writes(s);
 155         return 0;
 156 }
 157
 158 extern const struct in_core_key MAX_IN_CORE_KEY;
 159
 160 /*
 161  * this is used to delete "save link" when there are no items of a
 162  * file it points to. It can either happen if unlink is completed but
 163  * "save unlink" removal, or if file has both unlink and truncate
 164  * pending and as unlink completes first (because key of "save link"
 165  * protecting unlink is bigger that a key lf "save link" which
 166  * protects truncate), so there left no items to make truncate
 167  * completion on
 168  */
 169 static int remove_save_link_only(struct super_block *s,
 170                                  struct reiserfs_key *key, int oid_free)
 171 {
 172         struct reiserfs_transaction_handle th;
 173         int err;
 174
 175         /* we are going to do one balancing */
 176         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 177         if (err)
 178                 return err;
 179
 180         reiserfs_delete_solid_item(&th, NULL, key);
 181         if (oid_free)
 182                 /* removals are protected by direct items */
 183                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 184
 185         return journal_end(&th);
 186 }
 187
 188 #ifdef CONFIG_QUOTA
 189 static int reiserfs_quota_on_mount(struct super_block *, int);
 190 #endif
 191
 192 /* look for uncompleted unlinks and truncates and complete them */
 193 static int finish_unfinished(struct super_block *s)
 194 {
 195         INITIALIZE_PATH(path);
 196         struct cpu_key max_cpu_key, obj_key;
 197         struct reiserfs_key save_link_key, last_inode_key;
 198         int retval = 0;
 199         struct item_head *ih;
 200         struct buffer_head *bh;
 201         int item_pos;
 202         char *item;
 203         int done;
 204         struct inode *inode;
 205         int truncate;
 206 #ifdef CONFIG_QUOTA
 207         int i;
 208         int ms_active_set;
 209         int quota_enabled[REISERFS_MAXQUOTAS];
 210 #endif
 211
 212         /* compose key to look for "save" links */
 213         max_cpu_key.version = KEY_FORMAT_3_5;
 214         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 215         max_cpu_key.on_disk_key.k_objectid = ~0U;
 216         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 217         max_cpu_key.key_length = 3;
 218
 219         memset(&last_inode_key, 0, sizeof(last_inode_key));
 220
 221 #ifdef CONFIG_QUOTA
 222         /* Needed for iput() to work correctly and not trash data */
 223         if (s->s_flags & MS_ACTIVE) {
 224                 ms_active_set = 0;
 225         } else {
 226                 ms_active_set = 1;
 227                 s->s_flags |= MS_ACTIVE;
 228         }
 229         /* Turn on quotas so that they are updated correctly */
 230         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 231                 quota_enabled[i] = 1;
 232                 if (REISERFS_SB(s)->s_qf_names[i]) {
 233                         int ret;
 234
 235                         if (sb_has_quota_active(s, i)) {
 236                                 quota_enabled[i] = 0;
 237                                 continue;
 238                         }
 239                         ret = reiserfs_quota_on_mount(s, i);
 240                         if (ret < 0)
 241                                 reiserfs_warning(s, "reiserfs-2500",
 242                                                  "cannot turn on journaled "
 243                                                  "quota: error %d", ret);
 244                 }
 245         }
 246 #endif
 247
 248         done = 0;
 249         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 250         while (!retval) {
 251                 int depth;
 252                 retval = search_item(s, &max_cpu_key, &path);
 253                 if (retval != ITEM_NOT_FOUND) {
 254                         reiserfs_error(s, "vs-2140",
 255                                        "search_by_key returned %d", retval);
 256                         break;
 257                 }
 258
 259                 bh = get_last_bh(&path);
 260                 item_pos = get_item_pos(&path);
 261                 if (item_pos != B_NR_ITEMS(bh)) {
 262                         reiserfs_warning(s, "vs-2060",
 263                                          "wrong position found");
 264                         break;
 265                 }
 266                 item_pos--;
 267                 ih = item_head(bh, item_pos);
 268
 269                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 270                         /* there are no "save" links anymore */
 271                         break;
 272
 273                 save_link_key = ih->ih_key;
 274                 if (is_indirect_le_ih(ih))
 275                         truncate = 1;
 276                 else
 277                         truncate = 0;
 278
 279                 /* reiserfs_iget needs k_dirid and k_objectid only */
 280                 item = ih_item_body(bh, ih);
 281                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 282                 obj_key.on_disk_key.k_objectid =
 283                     le32_to_cpu(ih->ih_key.k_objectid);
 284                 obj_key.on_disk_key.k_offset = 0;
 285                 obj_key.on_disk_key.k_type = 0;
 286
 287                 pathrelse(&path);
 288
 289                 inode = reiserfs_iget(s, &obj_key);
 290                 if (!inode) {
 291                         /*
 292                          * the unlink almost completed, it just did not
 293                          * manage to remove "save" link and release objectid
 294                          */
 295                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 296                                          &obj_key);
 297                         retval = remove_save_link_only(s, &save_link_key, 1);
 298                         continue;
 299                 }
 300
 301                 if (!truncate && inode->i_nlink) {
 302                         /* file is not unlinked */
 303                         reiserfs_warning(s, "vs-2185",
 304                                          "file %K is not unlinked",
 305                                          &obj_key);
 306                         retval = remove_save_link_only(s, &save_link_key, 0);
 307                         continue;
 308                 }
 309                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 310                 dquot_initialize(inode);
 311                 reiserfs_write_lock_nested(inode->i_sb, depth);
 312
 313                 if (truncate && S_ISDIR(inode->i_mode)) {
 314                         /*
 315                          * We got a truncate request for a dir which
 316                          * is impossible.  The only imaginable way is to
 317                          * execute unfinished truncate request then boot
 318                          * into old kernel, remove the file and create dir
 319                          * with the same key.
 320                          */
 321                         reiserfs_warning(s, "green-2101",
 322                                          "impossible truncate on a "
 323                                          "directory %k. Please report",
 324                                          INODE_PKEY(inode));
 325                         retval = remove_save_link_only(s, &save_link_key, 0);
 326                         truncate = 0;
 327                         iput(inode);
 328                         continue;
 329                 }
 330
 331                 if (truncate) {
 332                         REISERFS_I(inode)->i_flags |=
 333                             i_link_saved_truncate_mask;
 334                         /*
 335                          * not completed truncate found. New size was
 336                          * committed together with "save" link
 337                          */
 338                         reiserfs_info(s, "Truncating %k to %lld ..",
 339                                       INODE_PKEY(inode), inode->i_size);
 340
 341                         /* don't update modification time */
 342                         reiserfs_truncate_file(inode, 0);
 343
 344                         retval = remove_save_link(inode, truncate);
 345                 } else {
 346                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 347                         /* not completed unlink (rmdir) found */
 348                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 349                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 350                                         sizeof(last_inode_key))){
 351                                 last_inode_key = *INODE_PKEY(inode);
 352                                 /* removal gets completed in iput */
 353                                 retval = 0;
 354                         } else {
 355                                 reiserfs_warning(s, "super-2189", "Dead loop "
 356                                                  "in finish_unfinished "
 357                                                  "detected, just remove "
 358                                                  "save link\n");
 359                                 retval = remove_save_link_only(s,
 360                                                         &save_link_key, 0);
 361                         }
 362                 }
 363
 364                 iput(inode);
 365                 printk("done\n");
 366                 done++;
 367         }
 368         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 369
 370 #ifdef CONFIG_QUOTA
 371         /* Turn quotas off */
 372         reiserfs_write_unlock(s);
 373         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 374                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 375                         dquot_quota_off(s, i);
 376         }
 377         reiserfs_write_lock(s);
 378         if (ms_active_set)
 379                 /* Restore the flag back */
 380                 s->s_flags &= ~MS_ACTIVE;
 381 #endif
 382         pathrelse(&path);
 383         if (done)
 384                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 385                               "Completed\n", done);
 386         return retval;
 387 }
 388
 389 /*
 390  * to protect file being unlinked from getting lost we "safe" link files
 391  * being unlinked. This link will be deleted in the same transaction with last
 392  * item of file. mounting the filesystem we scan all these links and remove
 393  * files which almost got lost
 394  */
 395 void add_save_link(struct reiserfs_transaction_handle *th,
 396                    struct inode *inode, int truncate)
 397 {
 398         INITIALIZE_PATH(path);
 399         int retval;
 400         struct cpu_key key;
 401         struct item_head ih;
 402         __le32 link;
 403
 404         BUG_ON(!th->t_trans_id);
 405
 406         /* file can only get one "save link" of each kind */
 407         RFALSE(truncate &&
 408                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 409                "saved link already exists for truncated inode %lx",
 410                (long)inode->i_ino);
 411         RFALSE(!truncate &&
 412                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 413                "saved link already exists for unlinked inode %lx",
 414                (long)inode->i_ino);
 415
 416         /* setup key of "save" link */
 417         key.version = KEY_FORMAT_3_5;
 418         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 419         key.on_disk_key.k_objectid = inode->i_ino;
 420         if (!truncate) {
 421                 /* unlink, rmdir, rename */
 422                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 423                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 424
 425                 /* item head of "safe" link */
 426                 make_le_item_head(&ih, &key, key.version,
 427                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 428                                   4 /*length */ , 0xffff /*free space */ );
 429         } else {
 430                 /* truncate */
 431                 if (S_ISDIR(inode->i_mode))
 432                         reiserfs_warning(inode->i_sb, "green-2102",
 433                                          "Adding a truncate savelink for "
 434                                          "a directory %k! Please report",
 435                                          INODE_PKEY(inode));
 436                 set_cpu_key_k_offset(&key, 1);
 437                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 438
 439                 /* item head of "safe" link */
 440                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 441                                   4 /*length */ , 0 /*free space */ );
 442         }
 443         key.key_length = 3;
 444
 445         /* look for its place in the tree */
 446         retval = search_item(inode->i_sb, &key, &path);
 447         if (retval != ITEM_NOT_FOUND) {
 448                 if (retval != -ENOSPC)
 449                         reiserfs_error(inode->i_sb, "vs-2100",
 450                                        "search_by_key (%K) returned %d", &key,
 451                                        retval);
 452                 pathrelse(&path);
 453                 return;
 454         }
 455
 456         /* body of "save" link */
 457         link = INODE_PKEY(inode)->k_dir_id;
 458
 459         /* put "save" link into tree, don't charge quota to anyone */
 460         retval =
 461             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 462         if (retval) {
 463                 if (retval != -ENOSPC)
 464                         reiserfs_error(inode->i_sb, "vs-2120",
 465                                        "insert_item returned %d", retval);
 466         } else {
 467                 if (truncate)
 468                         REISERFS_I(inode)->i_flags |=
 469                             i_link_saved_truncate_mask;
 470                 else
 471                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 472         }
 473 }
 474
 475 /* this opens transaction unlike add_save_link */
 476 int remove_save_link(struct inode *inode, int truncate)
 477 {
 478         struct reiserfs_transaction_handle th;
 479         struct reiserfs_key key;
 480         int err;
 481
 482         /* we are going to do one balancing only */
 483         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 484         if (err)
 485                 return err;
 486
 487         /* setup key of "save" link */
 488         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 489         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 490         if (!truncate) {
 491                 /* unlink, rmdir, rename */
 492                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 493                                     1 + inode->i_sb->s_blocksize);
 494                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 495         } else {
 496                 /* truncate */
 497                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 498                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 499         }
 500
 501         if ((truncate &&
 502              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 503             (!truncate &&
 504              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 505                 /* don't take quota bytes from anywhere */
 506                 reiserfs_delete_solid_item(&th, NULL, &key);
 507         if (!truncate) {
 508                 reiserfs_release_objectid(&th, inode->i_ino);
 509                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 510         } else
 511                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 512
 513         return journal_end(&th);
 514 }
 515
 516 static void reiserfs_kill_sb(struct super_block *s)
 517 {
 518         if (REISERFS_SB(s)) {
 519                 reiserfs_proc_info_done(s);
 520                 /*
 521                  * Force any pending inode evictions to occur now. Any
 522                  * inodes to be removed that have extended attributes
 523                  * associated with them need to clean them up before
 524                  * we can release the extended attribute root dentries.
 525                  * shrink_dcache_for_umount will BUG if we don't release
 526                  * those before it's called so ->put_super is too late.
 527                  */
 528                 shrink_dcache_sb(s);
 529
 530                 dput(REISERFS_SB(s)->xattr_root);
 531                 REISERFS_SB(s)->xattr_root = NULL;
 532                 dput(REISERFS_SB(s)->priv_root);
 533                 REISERFS_SB(s)->priv_root = NULL;
 534         }
 535
 536         kill_block_super(s);
 537 }
 538
 539 static void reiserfs_put_super(struct super_block *s)
 540 {
 541         struct reiserfs_transaction_handle th;
 542         th.t_trans_id = 0;
 543
 544         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 545
 546         reiserfs_write_lock(s);
 547
 548         /*
 549          * change file system state to current state if it was mounted
 550          * with read-write permissions
 551          */
 552         if (!(s->s_flags & MS_RDONLY)) {
 553                 if (!journal_begin(&th, s, 10)) {
 554                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 555                                                      1);
 556                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 557                                             REISERFS_SB(s)->s_mount_state);
 558                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 559                 }
 560         }
 561
 562         /*
 563          * note, journal_release checks for readonly mount, and can
 564          * decide not to do a journal_end
 565          */
 566         journal_release(&th, s);
 567
 568         reiserfs_free_bitmap_cache(s);
 569
 570         brelse(SB_BUFFER_WITH_SB(s));
 571
 572         print_statistics(s);
 573
 574         if (REISERFS_SB(s)->reserved_blocks != 0) {
 575                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 576                                  REISERFS_SB(s)->reserved_blocks);
 577         }
 578
 579         reiserfs_write_unlock(s);
 580         mutex_destroy(&REISERFS_SB(s)->lock);
 581         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 582         kfree(s->s_fs_info);
 583         s->s_fs_info = NULL;
 584 }
 585
 586 static struct kmem_cache *reiserfs_inode_cachep;
 587
 588 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 589 {
 590         struct reiserfs_inode_info *ei;
 591         ei = (struct reiserfs_inode_info *)
 592             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 593         if (!ei)
 594                 return NULL;
 595         atomic_set(&ei->openers, 0);
 596         mutex_init(&ei->tailpack);
 597 #ifdef CONFIG_QUOTA
 598         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 599 #endif
 600
 601         return &ei->vfs_inode;
 602 }
 603
 604 static void reiserfs_i_callback(struct rcu_head *head)
 605 {
 606         struct inode *inode = container_of(head, struct inode, i_rcu);
 607         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 608 }
 609
 610 static void reiserfs_destroy_inode(struct inode *inode)
 611 {
 612         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 613 }
 614
 615 static void init_once(void *foo)
 616 {
 617         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 618
 619         INIT_LIST_HEAD(&ei->i_prealloc_list);
 620         inode_init_once(&ei->vfs_inode);
 621 }
 622
 623 static int __init init_inodecache(void)
 624 {
 625         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 626                                                   sizeof(struct
 627                                                          reiserfs_inode_info),
 628                                                   0, (SLAB_RECLAIM_ACCOUNT|
 629                                                         SLAB_MEM_SPREAD),
 630                                                   init_once);
 631         if (reiserfs_inode_cachep == NULL)
 632                 return -ENOMEM;
 633         return 0;
 634 }
 635
 636 static void destroy_inodecache(void)
 637 {
 638         /*
 639          * Make sure all delayed rcu free inodes are flushed before we
 640          * destroy cache.
 641          */
 642         rcu_barrier();
 643         kmem_cache_destroy(reiserfs_inode_cachep);
 644 }
 645
 646 /* we don't mark inodes dirty, we just log them */
 647 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 648 {
 649         struct reiserfs_transaction_handle th;
 650
 651         int err = 0;
 652
 653         if (inode->i_sb->s_flags & MS_RDONLY) {
 654                 reiserfs_warning(inode->i_sb, "clm-6006",
 655                                  "writing inode %lu on readonly FS",
 656                                  inode->i_ino);
 657                 return;
 658         }
 659         reiserfs_write_lock(inode->i_sb);
 660
 661         /*
 662          * this is really only used for atime updates, so they don't have
 663          * to be included in O_SYNC or fsync
 664          */
 665         err = journal_begin(&th, inode->i_sb, 1);
 666         if (err)
 667                 goto out;
 668
 669         reiserfs_update_sd(&th, inode);
 670         journal_end(&th);
 671
 672 out:
 673         reiserfs_write_unlock(inode->i_sb);
 674 }
 675
 676 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 677 {
 678         struct super_block *s = root->d_sb;
 679         struct reiserfs_journal *journal = SB_JOURNAL(s);
 680         long opts = REISERFS_SB(s)->s_mount_opt;
 681
 682         if (opts & (1 << REISERFS_LARGETAIL))
 683                 seq_puts(seq, ",tails=on");
 684         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 685                 seq_puts(seq, ",notail");
 686         /* tails=small is default so we don't show it */
 687
 688         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 689                 seq_puts(seq, ",barrier=none");
 690         /* barrier=flush is default so we don't show it */
 691
 692         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 693                 seq_puts(seq, ",errors=continue");
 694         else if (opts & (1 << REISERFS_ERROR_PANIC))
 695                 seq_puts(seq, ",errors=panic");
 696         /* errors=ro is default so we don't show it */
 697
 698         if (opts & (1 << REISERFS_DATA_LOG))
 699                 seq_puts(seq, ",data=journal");
 700         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 701                 seq_puts(seq, ",data=writeback");
 702         /* data=ordered is default so we don't show it */
 703
 704         if (opts & (1 << REISERFS_ATTRS))
 705                 seq_puts(seq, ",attrs");
 706
 707         if (opts & (1 << REISERFS_XATTRS_USER))
 708                 seq_puts(seq, ",user_xattr");
 709
 710         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 711                 seq_puts(seq, ",expose_privroot");
 712
 713         if (opts & (1 << REISERFS_POSIXACL))
 714                 seq_puts(seq, ",acl");
 715
 716         if (REISERFS_SB(s)->s_jdev)
 717                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 718
 719         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 720                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 721
 722 #ifdef CONFIG_QUOTA
 723         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 724                 seq_show_option(seq, "usrjquota",
 725                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 726         else if (opts & (1 << REISERFS_USRQUOTA))
 727                 seq_puts(seq, ",usrquota");
 728         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 729                 seq_show_option(seq, "grpjquota",
 730                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 731         else if (opts & (1 << REISERFS_GRPQUOTA))
 732                 seq_puts(seq, ",grpquota");
 733         if (REISERFS_SB(s)->s_jquota_fmt) {
 734                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 735                         seq_puts(seq, ",jqfmt=vfsold");
 736                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 737                         seq_puts(seq, ",jqfmt=vfsv0");
 738         }
 739 #endif
 740
 741         /* Block allocator options */
 742         if (opts & (1 << REISERFS_NO_BORDER))
 743                 seq_puts(seq, ",block-allocator=noborder");
 744         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 745                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 746         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 747                 seq_puts(seq, ",block-allocator=hashed_relocation");
 748         if (opts & (1 << REISERFS_TEST4))
 749                 seq_puts(seq, ",block-allocator=test4");
 750         show_alloc_options(seq, s);
 751         return 0;
 752 }
 753
 754 #ifdef CONFIG_QUOTA
 755 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 756                                     size_t, loff_t);
 757 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 758                                    loff_t);
 759
 760 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 761 {
 762         return REISERFS_I(inode)->i_dquot;
 763 }
 764 #endif
 765
 766 static const struct super_operations reiserfs_sops = {
 767         .alloc_inode = reiserfs_alloc_inode,
 768         .destroy_inode = reiserfs_destroy_inode,
 769         .write_inode = reiserfs_write_inode,
 770         .dirty_inode = reiserfs_dirty_inode,
 771         .evict_inode = reiserfs_evict_inode,
 772         .put_super = reiserfs_put_super,
 773         .sync_fs = reiserfs_sync_fs,
 774         .freeze_fs = reiserfs_freeze,
 775         .unfreeze_fs = reiserfs_unfreeze,
 776         .statfs = reiserfs_statfs,
 777         .remount_fs = reiserfs_remount,
 778         .show_options = reiserfs_show_options,
 779 #ifdef CONFIG_QUOTA
 780         .quota_read = reiserfs_quota_read,
 781         .quota_write = reiserfs_quota_write,
 782         .get_dquots = reiserfs_get_dquots,
 783 #endif
 784 };
 785
 786 #ifdef CONFIG_QUOTA
 787 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 788
 789 static int reiserfs_write_dquot(struct dquot *);
 790 static int reiserfs_acquire_dquot(struct dquot *);
 791 static int reiserfs_release_dquot(struct dquot *);
 792 static int reiserfs_mark_dquot_dirty(struct dquot *);
 793 static int reiserfs_write_info(struct super_block *, int);
 794 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 795
 796 static const struct dquot_operations reiserfs_quota_operations = {
 797         .write_dquot = reiserfs_write_dquot,
 798         .acquire_dquot = reiserfs_acquire_dquot,
 799         .release_dquot = reiserfs_release_dquot,
 800         .mark_dirty = reiserfs_mark_dquot_dirty,
 801         .write_info = reiserfs_write_info,
 802         .alloc_dquot    = dquot_alloc,
 803         .destroy_dquot  = dquot_destroy,
 804 };
 805
 806 static const struct quotactl_ops reiserfs_qctl_operations = {
 807         .quota_on = reiserfs_quota_on,
 808         .quota_off = dquot_quota_off,
 809         .quota_sync = dquot_quota_sync,
 810         .get_state = dquot_get_state,
 811         .set_info = dquot_set_dqinfo,
 812         .get_dqblk = dquot_get_dqblk,
 813         .set_dqblk = dquot_set_dqblk,
 814 };
 815 #endif
 816
 817 static const struct export_operations reiserfs_export_ops = {
 818         .encode_fh = reiserfs_encode_fh,
 819         .fh_to_dentry = reiserfs_fh_to_dentry,
 820         .fh_to_parent = reiserfs_fh_to_parent,
 821         .get_parent = reiserfs_get_parent,
 822 };
 823
 824 /*
 825  * this struct is used in reiserfs_getopt () for containing the value for
 826  * those mount options that have values rather than being toggles.
 827  */
 828 typedef struct {
 829         char *value;
 830         /*
 831          * bitmask which is to set on mount_options bitmask
 832          * when this value is found, 0 is no bits are to be changed.
 833          */
 834         int setmask;
 835         /*
 836          * bitmask which is to clear on mount_options bitmask
 837          * when this value is found, 0 is no bits are to be changed.
 838          * This is applied BEFORE setmask
 839          */
 840         int clrmask;
 841 } arg_desc_t;
 842
 843 /* Set this bit in arg_required to allow empty arguments */
 844 #define REISERFS_OPT_ALLOWEMPTY 31
 845
 846 /*
 847  * this struct is used in reiserfs_getopt() for describing the
 848  * set of reiserfs mount options
 849  */
 850 typedef struct {
 851         char *option_name;
 852
 853         /* 0 if argument is not required, not 0 otherwise */
 854         int arg_required;
 855
 856         /* list of values accepted by an option */
 857         const arg_desc_t *values;
 858
 859         /*
 860          * bitmask which is to set on mount_options bitmask
 861          * when this value is found, 0 is no bits are to be changed.
 862          */
 863         int setmask;
 864
 865         /*
 866          * bitmask which is to clear on mount_options bitmask
 867          * when this value is found, 0 is no bits are to be changed.
 868          * This is applied BEFORE setmask
 869          */
 870         int clrmask;
 871 } opt_desc_t;
 872
 873 /* possible values for -o data= */
 874 static const arg_desc_t logging_mode[] = {
 875         {"ordered", 1 << REISERFS_DATA_ORDERED,
 876          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 877         {"journal", 1 << REISERFS_DATA_LOG,
 878          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 879         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 880          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 881         {.value = NULL}
 882 };
 883
 884 /* possible values for -o barrier= */
 885 static const arg_desc_t barrier_mode[] = {
 886         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 887         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 888         {.value = NULL}
 889 };
 890
 891 /*
 892  * possible values for "-o block-allocator=" and bits which are to be set in
 893  * s_mount_opt of reiserfs specific part of in-core super block
 894  */
 895 static const arg_desc_t balloc[] = {
 896         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 897         {"border", 0, 1 << REISERFS_NO_BORDER},
 898         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 899         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 900         {"test4", 1 << REISERFS_TEST4, 0},
 901         {"notest4", 0, 1 << REISERFS_TEST4},
 902         {NULL, 0, 0}
 903 };
 904
 905 static const arg_desc_t tails[] = {
 906         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 907         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 908         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 909         {NULL, 0, 0}
 910 };
 911
 912 static const arg_desc_t error_actions[] = {
 913         {"panic", 1 << REISERFS_ERROR_PANIC,
 914          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 915         {"ro-remount", 1 << REISERFS_ERROR_RO,
 916          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 917 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 918         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 919          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 920 #endif
 921         {NULL, 0, 0},
 922 };
 923
 924 /*
 925  * proceed only one option from a list *cur - string containing of mount
 926  * options
 927  * opts - array of options which are accepted
 928  * opt_arg - if option is found and requires an argument and if it is specifed
 929  * in the input - pointer to the argument is stored here
 930  * bit_flags - if option requires to set a certain bit - it is set here
 931  * return -1 if unknown option is found, opt->arg_required otherwise
 932  */
 933 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 934                            char **opt_arg, unsigned long *bit_flags)
 935 {
 936         char *p;
 937         /*
 938          * foo=bar,
 939          * ^   ^  ^
 940          * |   |  +-- option_end
 941          * |   +-- arg_start
 942          * +-- option_start
 943          */
 944         const opt_desc_t *opt;
 945         const arg_desc_t *arg;
 946
 947         p = *cur;
 948
 949         /* assume argument cannot contain commas */
 950         *cur = strchr(p, ',');
 951         if (*cur) {
 952                 *(*cur) = '\0';
 953                 (*cur)++;
 954         }
 955
 956         if (!strncmp(p, "alloc=", 6)) {
 957                 /*
 958                  * Ugly special case, probably we should redo options
 959                  * parser so that it can understand several arguments for
 960                  * some options, also so that it can fill several bitfields
 961                  * with option values.
 962                  */
 963                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 964                         return -1;
 965                 } else {
 966                         return 0;
 967                 }
 968         }
 969
 970         /* for every option in the list */
 971         for (opt = opts; opt->option_name; opt++) {
 972                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 973                         if (bit_flags) {
 974                                 if (opt->clrmask ==
 975                                     (1 << REISERFS_UNSUPPORTED_OPT))
 976                                         reiserfs_warning(s, "super-6500",
 977                                                          "%s not supported.\n",
 978                                                          p);
 979                                 else
 980                                         *bit_flags &= ~opt->clrmask;
 981                                 if (opt->setmask ==
 982                                     (1 << REISERFS_UNSUPPORTED_OPT))
 983                                         reiserfs_warning(s, "super-6501",
 984                                                          "%s not supported.\n",
 985                                                          p);
 986                                 else
 987                                         *bit_flags |= opt->setmask;
 988                         }
 989                         break;
 990                 }
 991         }
 992         if (!opt->option_name) {
 993                 reiserfs_warning(s, "super-6502",
 994                                  "unknown mount option \"%s\"", p);
 995                 return -1;
 996         }
 997
 998         p += strlen(opt->option_name);
 999         switch (*p) {
1000         case '=':
1001                 if (!opt->arg_required) {
1002                         reiserfs_warning(s, "super-6503",
1003                                          "the option \"%s\" does not "
1004                                          "require an argument\n",
1005                                          opt->option_name);
1006                         return -1;
1007                 }
1008                 break;
1009
1010         case 0:
1011                 if (opt->arg_required) {
1012                         reiserfs_warning(s, "super-6504",
1013                                          "the option \"%s\" requires an "
1014                                          "argument\n", opt->option_name);
1015                         return -1;
1016                 }
1017                 break;
1018         default:
1019                 reiserfs_warning(s, "super-6505",
1020                                  "head of option \"%s\" is only correct\n",
1021                                  opt->option_name);
1022                 return -1;
1023         }
1024
1025         /*
1026          * move to the argument, or to next option if argument is not
1027          * required
1028          */
1029         p++;
1030
1031         if (opt->arg_required
1032             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1033             && !strlen(p)) {
1034                 /* this catches "option=," if not allowed */
1035                 reiserfs_warning(s, "super-6506",
1036                                  "empty argument for \"%s\"\n",
1037                                  opt->option_name);
1038                 return -1;
1039         }
1040
1041         if (!opt->values) {
1042                 /* *=NULLopt_arg contains pointer to argument */
1043                 *opt_arg = p;
1044                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1045         }
1046
1047         /* values possible for this option are listed in opt->values */
1048         for (arg = opt->values; arg->value; arg++) {
1049                 if (!strcmp(p, arg->value)) {
1050                         if (bit_flags) {
1051                                 *bit_flags &= ~arg->clrmask;
1052                                 *bit_flags |= arg->setmask;
1053                         }
1054                         return opt->arg_required;
1055                 }
1056         }
1057
1058         reiserfs_warning(s, "super-6506",
1059                          "bad value \"%s\" for option \"%s\"\n", p,
1060                          opt->option_name);
1061         return -1;
1062 }
1063
1064 /* returns 0 if something is wrong in option string, 1 - otherwise */
1065 static int reiserfs_parse_options(struct super_block *s,
1066
1067                                   /* string given via mount's -o */
1068                                   char *options,
1069
1070                                   /*
1071                                    * after the parsing phase, contains the
1072                                    * collection of bitflags defining what
1073                                    * mount options were selected.
1074                                    */
1075                                   unsigned long *mount_options,
1076
1077                                   /* strtol-ed from NNN of resize=NNN */
1078                                   unsigned long *blocks,
1079                                   char **jdev_name,
1080                                   unsigned int *commit_max_age,
1081                                   char **qf_names,
1082                                   unsigned int *qfmt)
1083 {
1084         int c;
1085         char *arg = NULL;
1086         char *pos;
1087         opt_desc_t opts[] = {
1088                 /*
1089                  * Compatibility stuff, so that -o notail for old
1090                  * setups still work
1091                  */
1092                 {"tails",.arg_required = 't',.values = tails},
1093                 {"notail",.clrmask =
1094                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1095                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1096                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1097                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1098                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1099 #ifdef CONFIG_REISERFS_FS_XATTR
1100                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1101                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1102 #else
1103                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1104                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1105 #endif
1106 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1107                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1108                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1109 #else
1110                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1111                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1112 #endif
1113                 {.option_name = "nolog"},
1114                 {"replayonly",.setmask = 1 << REPLAYONLY},
1115                 {"block-allocator",.arg_required = 'a',.values = balloc},
1116                 {"data",.arg_required = 'd',.values = logging_mode},
1117                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1118                 {"resize",.arg_required = 'r',.values = NULL},
1119                 {"jdev",.arg_required = 'j',.values = NULL},
1120                 {"nolargeio",.arg_required = 'w',.values = NULL},
1121                 {"commit",.arg_required = 'c',.values = NULL},
1122                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1123                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1124                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1125                 {"errors",.arg_required = 'e',.values = error_actions},
1126                 {"usrjquota",.arg_required =
1127                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1128                 {"grpjquota",.arg_required =
1129                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1130                 {"jqfmt",.arg_required = 'f',.values = NULL},
1131                 {.option_name = NULL}
1132         };
1133
1134         *blocks = 0;
1135         if (!options || !*options)
1136                 /*
1137                  * use default configuration: create tails, journaling on, no
1138                  * conversion to newest format
1139                  */
1140                 return 1;
1141
1142         for (pos = options; pos;) {
1143                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1144                 if (c == -1)
1145                         /* wrong option is given */
1146                         return 0;
1147
1148                 if (c == 'r') {
1149                         char *p;
1150
1151                         p = NULL;
1152                         /* "resize=NNN" or "resize=auto" */
1153
1154                         if (!strcmp(arg, "auto")) {
1155                                 /* From JFS code, to auto-get the size. */
1156                                 *blocks =
1157                                     s->s_bdev->bd_inode->i_size >> s->
1158                                     s_blocksize_bits;
1159                         } else {
1160                                 *blocks = simple_strtoul(arg, &p, 0);
1161                                 if (*p != '\0') {
1162                                         /* NNN does not look like a number */
1163                                         reiserfs_warning(s, "super-6507",
1164                                                          "bad value %s for "
1165                                                          "-oresize\n", arg);
1166                                         return 0;
1167                                 }
1168                         }
1169                 }
1170
1171                 if (c == 'c') {
1172                         char *p = NULL;
1173                         unsigned long val = simple_strtoul(arg, &p, 0);
1174                         /* commit=NNN (time in seconds) */
1175                         if (*p != '\0' || val >= (unsigned int)-1) {
1176                                 reiserfs_warning(s, "super-6508",
1177                                                  "bad value %s for -ocommit\n",
1178                                                  arg);
1179                                 return 0;
1180                         }
1181                         *commit_max_age = (unsigned int)val;
1182                 }
1183
1184                 if (c == 'w') {
1185                         reiserfs_warning(s, "super-6509", "nolargeio option "
1186                                          "is no longer supported");
1187                         return 0;
1188                 }
1189
1190                 if (c == 'j') {
1191                         if (arg && *arg && jdev_name) {
1192                                 /* Hm, already assigned? */
1193                                 if (*jdev_name) {
1194                                         reiserfs_warning(s, "super-6510",
1195                                                          "journal device was "
1196                                                          "already specified to "
1197                                                          "be %s", *jdev_name);
1198                                         return 0;
1199                                 }
1200                                 *jdev_name = arg;
1201                         }
1202                 }
1203 #ifdef CONFIG_QUOTA
1204                 if (c == 'u' || c == 'g') {
1205                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1206
1207                         if (sb_any_quota_loaded(s) &&
1208                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1209                                 reiserfs_warning(s, "super-6511",
1210                                                  "cannot change journaled "
1211                                                  "quota options when quota "
1212                                                  "turned on.");
1213                                 return 0;
1214                         }
1215                         if (*arg) {     /* Some filename specified? */
1216                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1217                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1218                                               arg)) {
1219                                         reiserfs_warning(s, "super-6512",
1220                                                          "%s quota file "
1221                                                          "already specified.",
1222                                                          QTYPE2NAME(qtype));
1223                                         return 0;
1224                                 }
1225                                 if (strchr(arg, '/')) {
1226                                         reiserfs_warning(s, "super-6513",
1227                                                          "quotafile must be "
1228                                                          "on filesystem root.");
1229                                         return 0;
1230                                 }
1231                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1232                                 if (!qf_names[qtype]) {
1233                                         reiserfs_warning(s, "reiserfs-2502",
1234                                                          "not enough memory "
1235                                                          "for storing "
1236                                                          "quotafile name.");
1237                                         return 0;
1238                                 }
1239                                 if (qtype == USRQUOTA)
1240                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1241                                 else
1242                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1243                         } else {
1244                                 if (qf_names[qtype] !=
1245                                     REISERFS_SB(s)->s_qf_names[qtype])
1246                                         kfree(qf_names[qtype]);
1247                                 qf_names[qtype] = NULL;
1248                                 if (qtype == USRQUOTA)
1249                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1250                                 else
1251                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1252                         }
1253                 }
1254                 if (c == 'f') {
1255                         if (!strcmp(arg, "vfsold"))
1256                                 *qfmt = QFMT_VFS_OLD;
1257                         else if (!strcmp(arg, "vfsv0"))
1258                                 *qfmt = QFMT_VFS_V0;
1259                         else {
1260                                 reiserfs_warning(s, "super-6514",
1261                                                  "unknown quota format "
1262                                                  "specified.");
1263                                 return 0;
1264                         }
1265                         if (sb_any_quota_loaded(s) &&
1266                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1267                                 reiserfs_warning(s, "super-6515",
1268                                                  "cannot change journaled "
1269                                                  "quota options when quota "
1270                                                  "turned on.");
1271                                 return 0;
1272                         }
1273                 }
1274 #else
1275                 if (c == 'u' || c == 'g' || c == 'f') {
1276                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1277                                          "quota options not supported.");
1278                         return 0;
1279                 }
1280 #endif
1281         }
1282
1283 #ifdef CONFIG_QUOTA
1284         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1285             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1286                 reiserfs_warning(s, "super-6515",
1287                                  "journaled quota format not specified.");
1288                 return 0;
1289         }
1290         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1291                sb_has_quota_loaded(s, USRQUOTA)) ||
1292             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1293                sb_has_quota_loaded(s, GRPQUOTA))) {
1294                 reiserfs_warning(s, "super-6516", "quota options must "
1295                                  "be present when quota is turned on.");
1296                 return 0;
1297         }
1298 #endif
1299
1300         return 1;
1301 }
1302
1303 static void switch_data_mode(struct super_block *s, unsigned long mode)
1304 {
1305         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1306                                          (1 << REISERFS_DATA_ORDERED) |
1307                                          (1 << REISERFS_DATA_WRITEBACK));
1308         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1309 }
1310
1311 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1312 {
1313         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1314                 if (!reiserfs_data_log(s)) {
1315                         switch_data_mode(s, REISERFS_DATA_LOG);
1316                         reiserfs_info(s, "switching to journaled data mode\n");
1317                 }
1318         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1319                 if (!reiserfs_data_ordered(s)) {
1320                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1321                         reiserfs_info(s, "switching to ordered data mode\n");
1322                 }
1323         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1324                 if (!reiserfs_data_writeback(s)) {
1325                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1326                         reiserfs_info(s, "switching to writeback data mode\n");
1327                 }
1328         }
1329 }
1330
1331 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1332 {
1333         int flush = (1 << REISERFS_BARRIER_FLUSH);
1334         int none = (1 << REISERFS_BARRIER_NONE);
1335         int all_barrier = flush | none;
1336
1337         if (bits & all_barrier) {
1338                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1339                 if (bits & flush) {
1340                         REISERFS_SB(s)->s_mount_opt |= flush;
1341                         printk("reiserfs: enabling write barrier flush mode\n");
1342                 } else if (bits & none) {
1343                         REISERFS_SB(s)->s_mount_opt |= none;
1344                         printk("reiserfs: write barriers turned off\n");
1345                 }
1346         }
1347 }
1348
1349 static void handle_attrs(struct super_block *s)
1350 {
1351         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1352
1353         if (reiserfs_attrs(s)) {
1354                 if (old_format_only(s)) {
1355                         reiserfs_warning(s, "super-6517", "cannot support "
1356                                          "attributes on 3.5.x disk format");
1357                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1358                         return;
1359                 }
1360                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1361                         reiserfs_warning(s, "super-6518", "cannot support "
1362                                          "attributes until flag is set in "
1363                                          "super-block");
1364                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1365                 }
1366         }
1367 }
1368
1369 #ifdef CONFIG_QUOTA
1370 static void handle_quota_files(struct super_block *s, char **qf_names,
1371                                unsigned int *qfmt)
1372 {
1373         int i;
1374
1375         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1376                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1377                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1378                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1379         }
1380         if (*qfmt)
1381                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1382 }
1383 #endif
1384
1385 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1386 {
1387         struct reiserfs_super_block *rs;
1388         struct reiserfs_transaction_handle th;
1389         unsigned long blocks;
1390         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1391         unsigned long safe_mask = 0;
1392         unsigned int commit_max_age = (unsigned int)-1;
1393         struct reiserfs_journal *journal = SB_JOURNAL(s);
1394         char *new_opts = kstrdup(arg, GFP_KERNEL);
1395         int err;
1396         char *qf_names[REISERFS_MAXQUOTAS];
1397         unsigned int qfmt = 0;
1398 #ifdef CONFIG_QUOTA
1399         int i;
1400 #endif
1401
1402         sync_filesystem(s);
1403         reiserfs_write_lock(s);
1404
1405 #ifdef CONFIG_QUOTA
1406         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1407 #endif
1408
1409         rs = SB_DISK_SUPER_BLOCK(s);
1410
1411         if (!reiserfs_parse_options
1412             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1413             qf_names, &qfmt)) {
1414 #ifdef CONFIG_QUOTA
1415                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1416                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1417                                 kfree(qf_names[i]);
1418 #endif
1419                 err = -EINVAL;
1420                 goto out_err_unlock;
1421         }
1422 #ifdef CONFIG_QUOTA
1423         handle_quota_files(s, qf_names, &qfmt);
1424 #endif
1425
1426         handle_attrs(s);
1427
1428         /* Add options that are safe here */
1429         safe_mask |= 1 << REISERFS_SMALLTAIL;
1430         safe_mask |= 1 << REISERFS_LARGETAIL;
1431         safe_mask |= 1 << REISERFS_NO_BORDER;
1432         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1433         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1434         safe_mask |= 1 << REISERFS_TEST4;
1435         safe_mask |= 1 << REISERFS_ATTRS;
1436         safe_mask |= 1 << REISERFS_XATTRS_USER;
1437         safe_mask |= 1 << REISERFS_POSIXACL;
1438         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1439         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1440         safe_mask |= 1 << REISERFS_ERROR_RO;
1441         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1442         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1443         safe_mask |= 1 << REISERFS_USRQUOTA;
1444         safe_mask |= 1 << REISERFS_GRPQUOTA;
1445
1446         /*
1447          * Update the bitmask, taking care to keep
1448          * the bits we're not allowed to change here
1449          */
1450         REISERFS_SB(s)->s_mount_opt =
1451             (REISERFS_SB(s)->
1452              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1453
1454         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1455                 journal->j_max_commit_age = commit_max_age;
1456                 journal->j_max_trans_age = commit_max_age;
1457         } else if (commit_max_age == 0) {
1458                 /* 0 means restore defaults. */
1459                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1460                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1461         }
1462
1463         if (blocks) {
1464                 err = reiserfs_resize(s, blocks);
1465                 if (err != 0)
1466                         goto out_err_unlock;
1467         }
1468
1469         if (*mount_flags & MS_RDONLY) {
1470                 reiserfs_write_unlock(s);
1471                 reiserfs_xattr_init(s, *mount_flags);
1472                 /* remount read-only */
1473                 if (s->s_flags & MS_RDONLY)
1474                         /* it is read-only already */
1475                         goto out_ok_unlocked;
1476
1477                 err = dquot_suspend(s, -1);
1478                 if (err < 0)
1479                         goto out_err;
1480
1481                 /* try to remount file system with read-only permissions */
1482                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1483                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1484                         goto out_ok_unlocked;
1485                 }
1486
1487                 reiserfs_write_lock(s);
1488
1489                 err = journal_begin(&th, s, 10);
1490                 if (err)
1491                         goto out_err_unlock;
1492
1493                 /* Mounting a rw partition read-only. */
1494                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1495                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1496                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1497         } else {
1498                 /* remount read-write */
1499                 if (!(s->s_flags & MS_RDONLY)) {
1500                         reiserfs_write_unlock(s);
1501                         reiserfs_xattr_init(s, *mount_flags);
1502                         goto out_ok_unlocked;   /* We are read-write already */
1503                 }
1504
1505                 if (reiserfs_is_journal_aborted(journal)) {
1506                         err = journal->j_errno;
1507                         goto out_err_unlock;
1508                 }
1509
1510                 handle_data_mode(s, mount_options);
1511                 handle_barrier_mode(s, mount_options);
1512                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1513
1514                 /* now it is safe to call journal_begin */
1515                 s->s_flags &= ~MS_RDONLY;
1516                 err = journal_begin(&th, s, 10);
1517                 if (err)
1518                         goto out_err_unlock;
1519
1520                 /* Mount a partition which is read-only, read-write */
1521                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1522                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1523                 s->s_flags &= ~MS_RDONLY;
1524                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1525                 if (!old_format_only(s))
1526                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1527                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1528                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1529                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1530         }
1531         /* this will force a full flush of all journal lists */
1532         SB_JOURNAL(s)->j_must_wait = 1;
1533         err = journal_end(&th);
1534         if (err)
1535                 goto out_err_unlock;
1536
1537         reiserfs_write_unlock(s);
1538         if (!(*mount_flags & MS_RDONLY)) {
1539                 dquot_resume(s, -1);
1540                 reiserfs_write_lock(s);
1541                 finish_unfinished(s);
1542                 reiserfs_write_unlock(s);
1543                 reiserfs_xattr_init(s, *mount_flags);
1544         }
1545
1546 out_ok_unlocked:
1547         replace_mount_options(s, new_opts);
1548         return 0;
1549
1550 out_err_unlock:
1551         reiserfs_write_unlock(s);
1552 out_err:
1553         kfree(new_opts);
1554         return err;
1555 }
1556
1557 static int read_super_block(struct super_block *s, int offset)
1558 {
1559         struct buffer_head *bh;
1560         struct reiserfs_super_block *rs;
1561         int fs_blocksize;
1562
1563         bh = sb_bread(s, offset / s->s_blocksize);
1564         if (!bh) {
1565                 reiserfs_warning(s, "sh-2006",
1566                                  "bread failed (dev %s, block %lu, size %lu)",
1567                                  s->s_id, offset / s->s_blocksize,
1568                                  s->s_blocksize);
1569                 return 1;
1570         }
1571
1572         rs = (struct reiserfs_super_block *)bh->b_data;
1573         if (!is_any_reiserfs_magic_string(rs)) {
1574                 brelse(bh);
1575                 return 1;
1576         }
1577         /*
1578          * ok, reiserfs signature (old or new) found in at the given offset
1579          */
1580         fs_blocksize = sb_blocksize(rs);
1581         brelse(bh);
1582         sb_set_blocksize(s, fs_blocksize);
1583
1584         bh = sb_bread(s, offset / s->s_blocksize);
1585         if (!bh) {
1586                 reiserfs_warning(s, "sh-2007",
1587                                  "bread failed (dev %s, block %lu, size %lu)",
1588                                  s->s_id, offset / s->s_blocksize,
1589                                  s->s_blocksize);
1590                 return 1;
1591         }
1592
1593         rs = (struct reiserfs_super_block *)bh->b_data;
1594         if (sb_blocksize(rs) != s->s_blocksize) {
1595                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1596                                  "filesystem on (dev %s, block %llu, size %lu)",
1597                                  s->s_id,
1598                                  (unsigned long long)bh->b_blocknr,
1599                                  s->s_blocksize);
1600                 brelse(bh);
1601                 return 1;
1602         }
1603
1604         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1605                 brelse(bh);
1606                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1607                                  "--rebuild-tree run detected. Please run\n"
1608                                  "reiserfsck --rebuild-tree and wait for a "
1609                                  "completion. If that fails\n"
1610                                  "get newer reiserfsprogs package");
1611                 return 1;
1612         }
1613
1614         SB_BUFFER_WITH_SB(s) = bh;
1615         SB_DISK_SUPER_BLOCK(s) = rs;
1616
1617         /*
1618          * magic is of non-standard journal filesystem, look at s_version to
1619          * find which format is in use
1620          */
1621         if (is_reiserfs_jr(rs)) {
1622                 if (sb_version(rs) == REISERFS_VERSION_2)
1623                         reiserfs_info(s, "found reiserfs format \"3.6\""
1624                                       " with non-standard journal\n");
1625                 else if (sb_version(rs) == REISERFS_VERSION_1)
1626                         reiserfs_info(s, "found reiserfs format \"3.5\""
1627                                       " with non-standard journal\n");
1628                 else {
1629                         reiserfs_warning(s, "sh-2012", "found unknown "
1630                                          "format \"%u\" of reiserfs with "
1631                                          "non-standard magic", sb_version(rs));
1632                         return 1;
1633                 }
1634         } else
1635                 /*
1636                  * s_version of standard format may contain incorrect
1637                  * information, so we just look at the magic string
1638                  */
1639                 reiserfs_info(s,
1640                               "found reiserfs format \"%s\" with standard journal\n",
1641                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1642
1643         s->s_op = &reiserfs_sops;
1644         s->s_export_op = &reiserfs_export_ops;
1645 #ifdef CONFIG_QUOTA
1646         s->s_qcop = &reiserfs_qctl_operations;
1647         s->dq_op = &reiserfs_quota_operations;
1648         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1649 #endif
1650
1651         /*
1652          * new format is limited by the 32 bit wide i_blocks field, want to
1653          * be one full block below that.
1654          */
1655         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1656         return 0;
1657 }
1658
1659 /* after journal replay, reread all bitmap and super blocks */
1660 static int reread_meta_blocks(struct super_block *s)
1661 {
1662         ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1663         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1664         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1665                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1666                 return 1;
1667         }
1668
1669         return 0;
1670 }
1671
1672 /* hash detection stuff */
1673
1674 /*
1675  * if root directory is empty - we set default - Yura's - hash and
1676  * warn about it
1677  * FIXME: we look for only one name in a directory. If tea and yura
1678  * both have the same value - we ask user to send report to the
1679  * mailing list
1680  */
1681 static __u32 find_hash_out(struct super_block *s)
1682 {
1683         int retval;
1684         struct inode *inode;
1685         struct cpu_key key;
1686         INITIALIZE_PATH(path);
1687         struct reiserfs_dir_entry de;
1688         struct reiserfs_de_head *deh;
1689         __u32 hash = DEFAULT_HASH;
1690         __u32 deh_hashval, teahash, r5hash, yurahash;
1691
1692         inode = d_inode(s->s_root);
1693
1694         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1695         retval = search_by_entry_key(s, &key, &path, &de);
1696         if (retval == IO_ERROR) {
1697                 pathrelse(&path);
1698                 return UNSET_HASH;
1699         }
1700         if (retval == NAME_NOT_FOUND)
1701                 de.de_entry_num--;
1702
1703         set_de_name_and_namelen(&de);
1704         deh = de.de_deh + de.de_entry_num;
1705
1706         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1707                 /* allow override in this case */
1708                 if (reiserfs_rupasov_hash(s))
1709                         hash = YURA_HASH;
1710                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1711                 goto out;
1712         }
1713
1714         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1715         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1716         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1717         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1718
1719         if ((teahash == r5hash && deh_hashval == r5hash) ||
1720             (teahash == yurahash && deh_hashval == yurahash) ||
1721             (r5hash == yurahash && deh_hashval == yurahash)) {
1722                 reiserfs_warning(s, "reiserfs-2506",
1723                                  "Unable to automatically detect hash "
1724                                  "function. Please mount with -o "
1725                                  "hash={tea,rupasov,r5}");
1726                 hash = UNSET_HASH;
1727                 goto out;
1728         }
1729
1730         if (deh_hashval == yurahash)
1731                 hash = YURA_HASH;
1732         else if (deh_hashval == teahash)
1733                 hash = TEA_HASH;
1734         else if (deh_hashval == r5hash)
1735                 hash = R5_HASH;
1736         else {
1737                 reiserfs_warning(s, "reiserfs-2506",
1738                                  "Unrecognised hash function");
1739                 hash = UNSET_HASH;
1740         }
1741 out:
1742         pathrelse(&path);
1743         return hash;
1744 }
1745
1746 /* finds out which hash names are sorted with */
1747 static int what_hash(struct super_block *s)
1748 {
1749         __u32 code;
1750
1751         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1752
1753         /*
1754          * reiserfs_hash_detect() == true if any of the hash mount options
1755          * were used.  We must check them to make sure the user isn't
1756          * using a bad hash value
1757          */
1758         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1759                 code = find_hash_out(s);
1760
1761         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1762                 /*
1763                  * detection has found the hash, and we must check against the
1764                  * mount options
1765                  */
1766                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1767                         reiserfs_warning(s, "reiserfs-2507",
1768                                          "Error, %s hash detected, "
1769                                          "unable to force rupasov hash",
1770                                          reiserfs_hashname(code));
1771                         code = UNSET_HASH;
1772                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1773                         reiserfs_warning(s, "reiserfs-2508",
1774                                          "Error, %s hash detected, "
1775                                          "unable to force tea hash",
1776                                          reiserfs_hashname(code));
1777                         code = UNSET_HASH;
1778                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1779                         reiserfs_warning(s, "reiserfs-2509",
1780                                          "Error, %s hash detected, "
1781                                          "unable to force r5 hash",
1782                                          reiserfs_hashname(code));
1783                         code = UNSET_HASH;
1784                 }
1785         } else {
1786                 /*
1787                  * find_hash_out was not called or
1788                  * could not determine the hash
1789                  */
1790                 if (reiserfs_rupasov_hash(s)) {
1791                         code = YURA_HASH;
1792                 } else if (reiserfs_tea_hash(s)) {
1793                         code = TEA_HASH;
1794                 } else if (reiserfs_r5_hash(s)) {
1795                         code = R5_HASH;
1796                 }
1797         }
1798
1799         /*
1800          * if we are mounted RW, and we have a new valid hash code, update
1801          * the super
1802          */
1803         if (code != UNSET_HASH &&
1804             !(s->s_flags & MS_RDONLY) &&
1805             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1806                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1807         }
1808         return code;
1809 }
1810
1811 /* return pointer to appropriate function */
1812 static hashf_t hash_function(struct super_block *s)
1813 {
1814         switch (what_hash(s)) {
1815         case TEA_HASH:
1816                 reiserfs_info(s, "Using tea hash to sort names\n");
1817                 return keyed_hash;
1818         case YURA_HASH:
1819                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1820                 return yura_hash;
1821         case R5_HASH:
1822                 reiserfs_info(s, "Using r5 hash to sort names\n");
1823                 return r5_hash;
1824         }
1825         return NULL;
1826 }
1827
1828 /* this is used to set up correct value for old partitions */
1829 static int function2code(hashf_t func)
1830 {
1831         if (func == keyed_hash)
1832                 return TEA_HASH;
1833         if (func == yura_hash)
1834                 return YURA_HASH;
1835         if (func == r5_hash)
1836                 return R5_HASH;
1837
1838         BUG();                  /* should never happen */
1839
1840         return 0;
1841 }
1842
1843 #define SWARN(silent, s, id, ...)                       \
1844         if (!(silent))                          \
1845                 reiserfs_warning(s, id, __VA_ARGS__)
1846
1847 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1848 {
1849         struct inode *root_inode;
1850         struct reiserfs_transaction_handle th;
1851         int old_format = 0;
1852         unsigned long blocks;
1853         unsigned int commit_max_age = 0;
1854         int jinit_done = 0;
1855         struct reiserfs_iget_args args;
1856         struct reiserfs_super_block *rs;
1857         char *jdev_name;
1858         struct reiserfs_sb_info *sbi;
1859         int errval = -EINVAL;
1860         char *qf_names[REISERFS_MAXQUOTAS] = {};
1861         unsigned int qfmt = 0;
1862
1863         save_mount_options(s, data);
1864
1865         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1866         if (!sbi)
1867                 return -ENOMEM;
1868         s->s_fs_info = sbi;
1869         /* Set default values for options: non-aggressive tails, RO on errors */
1870         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1871         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1872         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1873         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1874         sbi->s_alloc_options.preallocmin = 0;
1875         /* Preallocate by 16 blocks (17-1) at once */
1876         sbi->s_alloc_options.preallocsize = 17;
1877         /* setup default block allocator options */
1878         reiserfs_init_alloc_options(s);
1879
1880         spin_lock_init(&sbi->old_work_lock);
1881         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1882         mutex_init(&sbi->lock);
1883         sbi->lock_depth = -1;
1884
1885         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1886                                          s->s_id);
1887         if (!sbi->commit_wq) {
1888                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1889                 errval = -ENOMEM;
1890                 goto error_unlocked;
1891         }
1892
1893         jdev_name = NULL;
1894         if (reiserfs_parse_options
1895             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1896              &commit_max_age, qf_names, &qfmt) == 0) {
1897                 goto error_unlocked;
1898         }
1899         if (jdev_name && jdev_name[0]) {
1900                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1901                 if (!sbi->s_jdev) {
1902                         SWARN(silent, s, "", "Cannot allocate memory for "
1903                                 "journal device name");
1904                         goto error;
1905                 }
1906         }
1907 #ifdef CONFIG_QUOTA
1908         handle_quota_files(s, qf_names, &qfmt);
1909 #endif
1910
1911         if (blocks) {
1912                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1913                 goto error_unlocked;
1914         }
1915
1916         /*
1917          * try old format (undistributed bitmap, super block in 8-th 1k
1918          * block of a device)
1919          */
1920         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1921                 old_format = 1;
1922
1923         /*
1924          * try new format (64-th 1k block), which can contain reiserfs
1925          * super block
1926          */
1927         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1928                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1929                       s->s_id);
1930                 goto error_unlocked;
1931         }
1932
1933         rs = SB_DISK_SUPER_BLOCK(s);
1934         /*
1935          * Let's do basic sanity check to verify that underlying device is not
1936          * smaller than the filesystem. If the check fails then abort and
1937          * scream, because bad stuff will happen otherwise.
1938          */
1939         if (s->s_bdev && s->s_bdev->bd_inode
1940             && i_size_read(s->s_bdev->bd_inode) <
1941             sb_block_count(rs) * sb_blocksize(rs)) {
1942                 SWARN(silent, s, "", "Filesystem cannot be "
1943                       "mounted because it is bigger than the device");
1944                 SWARN(silent, s, "", "You may need to run fsck "
1945                       "or increase size of your LVM partition");
1946                 SWARN(silent, s, "", "Or may be you forgot to "
1947                       "reboot after fdisk when it told you to");
1948                 goto error_unlocked;
1949         }
1950
1951         sbi->s_mount_state = SB_REISERFS_STATE(s);
1952         sbi->s_mount_state = REISERFS_VALID_FS;
1953
1954         if ((errval = reiserfs_init_bitmap_cache(s))) {
1955                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1956                 goto error_unlocked;
1957         }
1958
1959         errval = -EINVAL;
1960 #ifdef CONFIG_REISERFS_CHECK
1961         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1962         SWARN(silent, s, "", "- it is slow mode for debugging.");
1963 #endif
1964
1965         /* make data=ordered the default */
1966         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1967             !reiserfs_data_writeback(s)) {
1968                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1969         }
1970
1971         if (reiserfs_data_log(s)) {
1972                 reiserfs_info(s, "using journaled data mode\n");
1973         } else if (reiserfs_data_ordered(s)) {
1974                 reiserfs_info(s, "using ordered data mode\n");
1975         } else {
1976                 reiserfs_info(s, "using writeback data mode\n");
1977         }
1978         if (reiserfs_barrier_flush(s)) {
1979                 printk("reiserfs: using flush barriers\n");
1980         }
1981
1982         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1983                 SWARN(silent, s, "sh-2022",
1984                       "unable to initialize journal space");
1985                 goto error_unlocked;
1986         } else {
1987                 /*
1988                  * once this is set, journal_release must be called
1989                  * if we error out of the mount
1990                  */
1991                 jinit_done = 1;
1992         }
1993
1994         if (reread_meta_blocks(s)) {
1995                 SWARN(silent, s, "jmacd-9",
1996                       "unable to reread meta blocks after journal init");
1997                 goto error_unlocked;
1998         }
1999
2000         if (replay_only(s))
2001                 goto error_unlocked;
2002
2003         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2004                 SWARN(silent, s, "clm-7000",
2005                       "Detected readonly device, marking FS readonly");
2006                 s->s_flags |= MS_RDONLY;
2007         }
2008         args.objectid = REISERFS_ROOT_OBJECTID;
2009         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2010         root_inode =
2011             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2012                          reiserfs_init_locked_inode, (void *)&args);
2013         if (!root_inode) {
2014                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2015                 goto error_unlocked;
2016         }
2017
2018         /*
2019          * This path assumed to be called with the BKL in the old times.
2020          * Now we have inherited the big reiserfs lock from it and many
2021          * reiserfs helpers called in the mount path and elsewhere require
2022          * this lock to be held even if it's not always necessary. Let's be
2023          * conservative and hold it early. The window can be reduced after
2024          * careful review of the code.
2025          */
2026         reiserfs_write_lock(s);
2027
2028         if (root_inode->i_state & I_NEW) {
2029                 reiserfs_read_locked_inode(root_inode, &args);
2030                 unlock_new_inode(root_inode);
2031         }
2032
2033         s->s_root = d_make_root(root_inode);
2034         if (!s->s_root)
2035                 goto error;
2036         /* define and initialize hash function */
2037         sbi->s_hash_function = hash_function(s);
2038         if (sbi->s_hash_function == NULL) {
2039                 dput(s->s_root);
2040                 s->s_root = NULL;
2041                 goto error;
2042         }
2043
2044         if (is_reiserfs_3_5(rs)
2045             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2046                 set_bit(REISERFS_3_5, &sbi->s_properties);
2047         else if (old_format)
2048                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2049         else
2050                 set_bit(REISERFS_3_6, &sbi->s_properties);
2051
2052         if (!(s->s_flags & MS_RDONLY)) {
2053
2054                 errval = journal_begin(&th, s, 1);
2055                 if (errval) {
2056                         dput(s->s_root);
2057                         s->s_root = NULL;
2058                         goto error;
2059                 }
2060                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2061
2062                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2063                 set_sb_fs_state(rs, 0);
2064
2065                 /*
2066                  * Clear out s_bmap_nr if it would wrap. We can handle this
2067                  * case, but older revisions can't. This will cause the
2068                  * file system to fail mount on those older implementations,
2069                  * avoiding corruption. -jeffm
2070                  */
2071                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2072                     sb_bmap_nr(rs) != 0) {
2073                         reiserfs_warning(s, "super-2030", "This file system "
2074                                         "claims to use %u bitmap blocks in "
2075                                         "its super block, but requires %u. "
2076                                         "Clearing to zero.", sb_bmap_nr(rs),
2077                                         reiserfs_bmap_count(s));
2078
2079                         set_sb_bmap_nr(rs, 0);
2080                 }
2081
2082                 if (old_format_only(s)) {
2083                         /*
2084                          * filesystem of format 3.5 either with standard
2085                          * or non-standard journal
2086                          */
2087                         if (convert_reiserfs(s)) {
2088                                 /* and -o conv is given */
2089                                 if (!silent)
2090                                         reiserfs_info(s,
2091                                                       "converting 3.5 filesystem to the 3.6 format");
2092
2093                                 if (is_reiserfs_3_5(rs))
2094                                         /*
2095                                          * put magic string of 3.6 format.
2096                                          * 2.2 will not be able to
2097                                          * mount this filesystem anymore
2098                                          */
2099                                         memcpy(rs->s_v1.s_magic,
2100                                                reiserfs_3_6_magic_string,
2101                                                sizeof
2102                                                (reiserfs_3_6_magic_string));
2103
2104                                 set_sb_version(rs, REISERFS_VERSION_2);
2105                                 reiserfs_convert_objectid_map_v1(s);
2106                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2107                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2108                         } else if (!silent) {
2109                                 reiserfs_info(s, "using 3.5.x disk format\n");
2110                         }
2111                 } else
2112                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2113
2114
2115                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2116                 errval = journal_end(&th);
2117                 if (errval) {
2118                         dput(s->s_root);
2119                         s->s_root = NULL;
2120                         goto error;
2121                 }
2122
2123                 reiserfs_write_unlock(s);
2124                 if ((errval = reiserfs_lookup_privroot(s)) ||
2125                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2126                         dput(s->s_root);
2127                         s->s_root = NULL;
2128                         goto error_unlocked;
2129                 }
2130                 reiserfs_write_lock(s);
2131
2132                 /*
2133                  * look for files which were to be removed in previous session
2134                  */
2135                 finish_unfinished(s);
2136         } else {
2137                 if (old_format_only(s) && !silent) {
2138                         reiserfs_info(s, "using 3.5.x disk format\n");
2139                 }
2140
2141                 reiserfs_write_unlock(s);
2142                 if ((errval = reiserfs_lookup_privroot(s)) ||
2143                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2144                         dput(s->s_root);
2145                         s->s_root = NULL;
2146                         goto error_unlocked;
2147                 }
2148                 reiserfs_write_lock(s);
2149         }
2150         /*
2151          * mark hash in super block: it could be unset. overwrite should be ok
2152          */
2153         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2154
2155         handle_attrs(s);
2156
2157         reiserfs_proc_info_init(s);
2158
2159         init_waitqueue_head(&(sbi->s_wait));
2160         spin_lock_init(&sbi->bitmap_lock);
2161
2162         reiserfs_write_unlock(s);
2163
2164         return (0);
2165
2166 error:
2167         reiserfs_write_unlock(s);
2168
2169 error_unlocked:
2170         /* kill the commit thread, free journal ram */
2171         if (jinit_done) {
2172                 reiserfs_write_lock(s);
2173                 journal_release_error(NULL, s);
2174                 reiserfs_write_unlock(s);
2175         }
2176
2177         if (sbi->commit_wq)
2178                 destroy_workqueue(sbi->commit_wq);
2179
2180         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2181
2182         reiserfs_free_bitmap_cache(s);
2183         if (SB_BUFFER_WITH_SB(s))
2184                 brelse(SB_BUFFER_WITH_SB(s));
2185 #ifdef CONFIG_QUOTA
2186         {
2187                 int j;
2188                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2189                         kfree(qf_names[j]);
2190         }
2191 #endif
2192         kfree(sbi);
2193
2194         s->s_fs_info = NULL;
2195         return errval;
2196 }
2197
2198 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2199 {
2200         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2201
2202         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2203         buf->f_bfree = sb_free_blocks(rs);
2204         buf->f_bavail = buf->f_bfree;
2205         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2206         buf->f_bsize = dentry->d_sb->s_blocksize;
2207         /* changed to accommodate gcc folks. */
2208         buf->f_type = REISERFS_SUPER_MAGIC;
2209         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2210         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2211                                 sizeof(rs->s_uuid)/2);
2212
2213         return 0;
2214 }
2215
2216 #ifdef CONFIG_QUOTA
2217 static int reiserfs_write_dquot(struct dquot *dquot)
2218 {
2219         struct reiserfs_transaction_handle th;
2220         int ret, err;
2221         int depth;
2222
2223         reiserfs_write_lock(dquot->dq_sb);
2224         ret =
2225             journal_begin(&th, dquot->dq_sb,
2226                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2227         if (ret)
2228                 goto out;
2229         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2230         ret = dquot_commit(dquot);
2231         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2232         err = journal_end(&th);
2233         if (!ret && err)
2234                 ret = err;
2235 out:
2236         reiserfs_write_unlock(dquot->dq_sb);
2237         return ret;
2238 }
2239
2240 static int reiserfs_acquire_dquot(struct dquot *dquot)
2241 {
2242         struct reiserfs_transaction_handle th;
2243         int ret, err;
2244         int depth;
2245
2246         reiserfs_write_lock(dquot->dq_sb);
2247         ret =
2248             journal_begin(&th, dquot->dq_sb,
2249                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2250         if (ret)
2251                 goto out;
2252         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2253         ret = dquot_acquire(dquot);
2254         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2255         err = journal_end(&th);
2256         if (!ret && err)
2257                 ret = err;
2258 out:
2259         reiserfs_write_unlock(dquot->dq_sb);
2260         return ret;
2261 }
2262
2263 static int reiserfs_release_dquot(struct dquot *dquot)
2264 {
2265         struct reiserfs_transaction_handle th;
2266         int ret, err;
2267
2268         reiserfs_write_lock(dquot->dq_sb);
2269         ret =
2270             journal_begin(&th, dquot->dq_sb,
2271                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2272         reiserfs_write_unlock(dquot->dq_sb);
2273         if (ret) {
2274                 /* Release dquot anyway to avoid endless cycle in dqput() */
2275                 dquot_release(dquot);
2276                 goto out;
2277         }
2278         ret = dquot_release(dquot);
2279         reiserfs_write_lock(dquot->dq_sb);
2280         err = journal_end(&th);
2281         if (!ret && err)
2282                 ret = err;
2283         reiserfs_write_unlock(dquot->dq_sb);
2284 out:
2285         return ret;
2286 }
2287
2288 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2289 {
2290         /* Are we journaling quotas? */
2291         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2292             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2293                 dquot_mark_dquot_dirty(dquot);
2294                 return reiserfs_write_dquot(dquot);
2295         } else
2296                 return dquot_mark_dquot_dirty(dquot);
2297 }
2298
2299 static int reiserfs_write_info(struct super_block *sb, int type)
2300 {
2301         struct reiserfs_transaction_handle th;
2302         int ret, err;
2303         int depth;
2304
2305         /* Data block + inode block */
2306         reiserfs_write_lock(sb);
2307         ret = journal_begin(&th, sb, 2);
2308         if (ret)
2309                 goto out;
2310         depth = reiserfs_write_unlock_nested(sb);
2311         ret = dquot_commit_info(sb, type);
2312         reiserfs_write_lock_nested(sb, depth);
2313         err = journal_end(&th);
2314         if (!ret && err)
2315                 ret = err;
2316 out:
2317         reiserfs_write_unlock(sb);
2318         return ret;
2319 }
2320
2321 /*
2322  * Turn on quotas during mount time - we need to find the quota file and such...
2323  */
2324 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2325 {
2326         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2327                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2328 }
2329
2330 /*
2331  * Standard function to be called on quota_on
2332  */
2333 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2334                              struct path *path)
2335 {
2336         int err;
2337         struct inode *inode;
2338         struct reiserfs_transaction_handle th;
2339         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2340
2341         reiserfs_write_lock(sb);
2342         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2343                 err = -EINVAL;
2344                 goto out;
2345         }
2346
2347         /* Quotafile not on the same filesystem? */
2348         if (path->dentry->d_sb != sb) {
2349                 err = -EXDEV;
2350                 goto out;
2351         }
2352         inode = d_inode(path->dentry);
2353         /*
2354          * We must not pack tails for quota files on reiserfs for quota
2355          * IO to work
2356          */
2357         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2358                 err = reiserfs_unpack(inode, NULL);
2359                 if (err) {
2360                         reiserfs_warning(sb, "super-6520",
2361                                 "Unpacking tail of quota file failed"
2362                                 " (%d). Cannot turn on quotas.", err);
2363                         err = -EINVAL;
2364                         goto out;
2365                 }
2366                 mark_inode_dirty(inode);
2367         }
2368         /* Journaling quota? */
2369         if (REISERFS_SB(sb)->s_qf_names[type]) {
2370                 /* Quotafile not of fs root? */
2371                 if (path->dentry->d_parent != sb->s_root)
2372                         reiserfs_warning(sb, "super-6521",
2373                                  "Quota file not on filesystem root. "
2374                                  "Journalled quota will not work.");
2375         }
2376
2377         /*
2378          * When we journal data on quota file, we have to flush journal to see
2379          * all updates to the file when we bypass pagecache...
2380          */
2381         if (reiserfs_file_data_log(inode)) {
2382                 /* Just start temporary transaction and finish it */
2383                 err = journal_begin(&th, sb, 1);
2384                 if (err)
2385                         goto out;
2386                 err = journal_end_sync(&th);
2387                 if (err)
2388                         goto out;
2389         }
2390         reiserfs_write_unlock(sb);
2391         return dquot_quota_on(sb, type, format_id, path);
2392 out:
2393         reiserfs_write_unlock(sb);
2394         return err;
2395 }
2396
2397 /*
2398  * Read data from quotafile - avoid pagecache and such because we cannot afford
2399  * acquiring the locks... As quota files are never truncated and quota code
2400  * itself serializes the operations (and no one else should touch the files)
2401  * we don't have to be afraid of races
2402  */
2403 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2404                                    size_t len, loff_t off)
2405 {
2406         struct inode *inode = sb_dqopt(sb)->files[type];
2407         unsigned long blk = off >> sb->s_blocksize_bits;
2408         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2409         size_t toread;
2410         struct buffer_head tmp_bh, *bh;
2411         loff_t i_size = i_size_read(inode);
2412
2413         if (off > i_size)
2414                 return 0;
2415         if (off + len > i_size)
2416                 len = i_size - off;
2417         toread = len;
2418         while (toread > 0) {
2419                 tocopy =
2420                     sb->s_blocksize - offset <
2421                     toread ? sb->s_blocksize - offset : toread;
2422                 tmp_bh.b_state = 0;
2423                 /*
2424                  * Quota files are without tails so we can safely
2425                  * use this function
2426                  */
2427                 reiserfs_write_lock(sb);
2428                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2429                 reiserfs_write_unlock(sb);
2430                 if (err)
2431                         return err;
2432                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2433                         memset(data, 0, tocopy);
2434                 else {
2435                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2436                         if (!bh)
2437                                 return -EIO;
2438                         memcpy(data, bh->b_data + offset, tocopy);
2439                         brelse(bh);
2440                 }
2441                 offset = 0;
2442                 toread -= tocopy;
2443                 data += tocopy;
2444                 blk++;
2445         }
2446         return len;
2447 }
2448
2449 /*
2450  * Write to quotafile (we know the transaction is already started and has
2451  * enough credits)
2452  */
2453 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2454                                     const char *data, size_t len, loff_t off)
2455 {
2456         struct inode *inode = sb_dqopt(sb)->files[type];
2457         unsigned long blk = off >> sb->s_blocksize_bits;
2458         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2459         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2460         size_t towrite = len;
2461         struct buffer_head tmp_bh, *bh;
2462
2463         if (!current->journal_info) {
2464                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2465                         (unsigned long long)off, (unsigned long long)len);
2466                 return -EIO;
2467         }
2468         while (towrite > 0) {
2469                 tocopy = sb->s_blocksize - offset < towrite ?
2470                     sb->s_blocksize - offset : towrite;
2471                 tmp_bh.b_state = 0;
2472                 reiserfs_write_lock(sb);
2473                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2474                 reiserfs_write_unlock(sb);
2475                 if (err)
2476                         goto out;
2477                 if (offset || tocopy != sb->s_blocksize)
2478                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2479                 else
2480                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2481                 if (!bh) {
2482                         err = -EIO;
2483                         goto out;
2484                 }
2485                 lock_buffer(bh);
2486                 memcpy(bh->b_data + offset, data, tocopy);
2487                 flush_dcache_page(bh->b_page);
2488                 set_buffer_uptodate(bh);
2489                 unlock_buffer(bh);
2490                 reiserfs_write_lock(sb);
2491                 reiserfs_prepare_for_journal(sb, bh, 1);
2492                 journal_mark_dirty(current->journal_info, bh);
2493                 if (!journal_quota)
2494                         reiserfs_add_ordered_list(inode, bh);
2495                 reiserfs_write_unlock(sb);
2496                 brelse(bh);
2497                 offset = 0;
2498                 towrite -= tocopy;
2499                 data += tocopy;
2500                 blk++;
2501         }
2502 out:
2503         if (len == towrite)
2504                 return err;
2505         if (inode->i_size < off + len - towrite)
2506                 i_size_write(inode, off + len - towrite);
2507         inode->i_version++;
2508         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2509         mark_inode_dirty(inode);
2510         return len - towrite;
2511 }
2512
2513 #endif
2514
2515 static struct dentry *get_super_block(struct file_system_type *fs_type,
2516                            int flags, const char *dev_name,
2517                            void *data)
2518 {
2519         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2520 }
2521
2522 static int __init init_reiserfs_fs(void)
2523 {
2524         int ret;
2525
2526         ret = init_inodecache();
2527         if (ret)
2528                 return ret;
2529
2530         reiserfs_proc_info_global_init();
2531
2532         ret = register_filesystem(&reiserfs_fs_type);
2533         if (ret)
2534                 goto out;
2535
2536         return 0;
2537 out:
2538         reiserfs_proc_info_global_done();
2539         destroy_inodecache();
2540
2541         return ret;
2542 }
2543
2544 static void __exit exit_reiserfs_fs(void)
2545 {
2546         reiserfs_proc_info_global_done();
2547         unregister_filesystem(&reiserfs_fs_type);
2548         destroy_inodecache();
2549 }
2550
2551 struct file_system_type reiserfs_fs_type = {
2552         .owner = THIS_MODULE,
2553         .name = "reiserfs",
2554         .mount = get_super_block,
2555         .kill_sb = reiserfs_kill_sb,
2556         .fs_flags = FS_REQUIRES_DEV,
2557 };
2558 MODULE_ALIAS_FS("reiserfs");
2559
2560 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2561 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2562 MODULE_LICENSE("GPL");
2563
2564 module_init(init_reiserfs_fs);
2565 module_exit(exit_reiserfs_fs);