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/backing-dev.h>
  25 #include <linux/buffer_head.h>
  26 #include <linux/exportfs.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/vfs.h>
  29 #include <linux/mount.h>
  30 #include <linux/namei.h>
  31 #include <linux/crc32.h>
  32 #include <linux/seq_file.h>
  33
  34 struct file_system_type reiserfs_fs_type;
  35
  36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  39
  40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  41 {
  42         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  43                         strlen(reiserfs_3_5_magic_string));
  44 }
  45
  46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  47 {
  48         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  49                         strlen(reiserfs_3_6_magic_string));
  50 }
  51
  52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  53 {
  54         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  55                         strlen(reiserfs_jr_magic_string));
  56 }
  57
  58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  59 {
  60         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  61                 is_reiserfs_jr(rs));
  62 }
  63
  64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         sbi->work_queued = 0;
  94         spin_unlock(&sbi->old_work_lock);
  95
  96         reiserfs_sync_fs(s, 1);
  97 }
  98
  99 void reiserfs_schedule_old_flush(struct super_block *s)
 100 {
 101         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 102         unsigned long delay;
 103
 104         /*
 105          * Avoid scheduling flush when sb is being shut down. It can race
 106          * with journal shutdown and free still queued delayed work.
 107          */
 108         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 109                 return;
 110
 111         spin_lock(&sbi->old_work_lock);
 112         if (!sbi->work_queued) {
 113                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 114                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 115                 sbi->work_queued = 1;
 116         }
 117         spin_unlock(&sbi->old_work_lock);
 118 }
 119
 120 static void cancel_old_flush(struct super_block *s)
 121 {
 122         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 123
 124         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 125         spin_lock(&sbi->old_work_lock);
 126         sbi->work_queued = 0;
 127         spin_unlock(&sbi->old_work_lock);
 128 }
 129
 130 static int reiserfs_freeze(struct super_block *s)
 131 {
 132         struct reiserfs_transaction_handle th;
 133
 134         cancel_old_flush(s);
 135
 136         reiserfs_write_lock(s);
 137         if (!(s->s_flags & MS_RDONLY)) {
 138                 int err = journal_begin(&th, s, 1);
 139                 if (err) {
 140                         reiserfs_block_writes(&th);
 141                 } else {
 142                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 143                                                      1);
 144                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 145                         reiserfs_block_writes(&th);
 146                         journal_end_sync(&th);
 147                 }
 148         }
 149         reiserfs_write_unlock(s);
 150         return 0;
 151 }
 152
 153 static int reiserfs_unfreeze(struct super_block *s)
 154 {
 155         reiserfs_allow_writes(s);
 156         return 0;
 157 }
 158
 159 extern const struct in_core_key MAX_IN_CORE_KEY;
 160
 161 /*
 162  * this is used to delete "save link" when there are no items of a
 163  * file it points to. It can either happen if unlink is completed but
 164  * "save unlink" removal, or if file has both unlink and truncate
 165  * pending and as unlink completes first (because key of "save link"
 166  * protecting unlink is bigger that a key lf "save link" which
 167  * protects truncate), so there left no items to make truncate
 168  * completion on
 169  */
 170 static int remove_save_link_only(struct super_block *s,
 171                                  struct reiserfs_key *key, int oid_free)
 172 {
 173         struct reiserfs_transaction_handle th;
 174         int err;
 175
 176         /* we are going to do one balancing */
 177         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 178         if (err)
 179                 return err;
 180
 181         reiserfs_delete_solid_item(&th, NULL, key);
 182         if (oid_free)
 183                 /* removals are protected by direct items */
 184                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 185
 186         return journal_end(&th);
 187 }
 188
 189 #ifdef CONFIG_QUOTA
 190 static int reiserfs_quota_on_mount(struct super_block *, int);
 191 #endif
 192
 193 /* look for uncompleted unlinks and truncates and complete them */
 194 static int finish_unfinished(struct super_block *s)
 195 {
 196         INITIALIZE_PATH(path);
 197         struct cpu_key max_cpu_key, obj_key;
 198         struct reiserfs_key save_link_key, last_inode_key;
 199         int retval = 0;
 200         struct item_head *ih;
 201         struct buffer_head *bh;
 202         int item_pos;
 203         char *item;
 204         int done;
 205         struct inode *inode;
 206         int truncate;
 207 #ifdef CONFIG_QUOTA
 208         int i;
 209         int ms_active_set;
 210         int quota_enabled[REISERFS_MAXQUOTAS];
 211 #endif
 212
 213         /* compose key to look for "save" links */
 214         max_cpu_key.version = KEY_FORMAT_3_5;
 215         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 216         max_cpu_key.on_disk_key.k_objectid = ~0U;
 217         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 218         max_cpu_key.key_length = 3;
 219
 220         memset(&last_inode_key, 0, sizeof(last_inode_key));
 221
 222 #ifdef CONFIG_QUOTA
 223         /* Needed for iput() to work correctly and not trash data */
 224         if (s->s_flags & MS_ACTIVE) {
 225                 ms_active_set = 0;
 226         } else {
 227                 ms_active_set = 1;
 228                 s->s_flags |= MS_ACTIVE;
 229         }
 230         /* Turn on quotas so that they are updated correctly */
 231         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 232                 quota_enabled[i] = 1;
 233                 if (REISERFS_SB(s)->s_qf_names[i]) {
 234                         int ret;
 235
 236                         if (sb_has_quota_active(s, i)) {
 237                                 quota_enabled[i] = 0;
 238                                 continue;
 239                         }
 240                         ret = reiserfs_quota_on_mount(s, i);
 241                         if (ret < 0)
 242                                 reiserfs_warning(s, "reiserfs-2500",
 243                                                  "cannot turn on journaled "
 244                                                  "quota: error %d", ret);
 245                 }
 246         }
 247 #endif
 248
 249         done = 0;
 250         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 251         while (!retval) {
 252                 int depth;
 253                 retval = search_item(s, &max_cpu_key, &path);
 254                 if (retval != ITEM_NOT_FOUND) {
 255                         reiserfs_error(s, "vs-2140",
 256                                        "search_by_key returned %d", retval);
 257                         break;
 258                 }
 259
 260                 bh = get_last_bh(&path);
 261                 item_pos = get_item_pos(&path);
 262                 if (item_pos != B_NR_ITEMS(bh)) {
 263                         reiserfs_warning(s, "vs-2060",
 264                                          "wrong position found");
 265                         break;
 266                 }
 267                 item_pos--;
 268                 ih = item_head(bh, item_pos);
 269
 270                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 271                         /* there are no "save" links anymore */
 272                         break;
 273
 274                 save_link_key = ih->ih_key;
 275                 if (is_indirect_le_ih(ih))
 276                         truncate = 1;
 277                 else
 278                         truncate = 0;
 279
 280                 /* reiserfs_iget needs k_dirid and k_objectid only */
 281                 item = ih_item_body(bh, ih);
 282                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 283                 obj_key.on_disk_key.k_objectid =
 284                     le32_to_cpu(ih->ih_key.k_objectid);
 285                 obj_key.on_disk_key.k_offset = 0;
 286                 obj_key.on_disk_key.k_type = 0;
 287
 288                 pathrelse(&path);
 289
 290                 inode = reiserfs_iget(s, &obj_key);
 291                 if (IS_ERR_OR_NULL(inode)) {
 292                         /*
 293                          * the unlink almost completed, it just did not
 294                          * manage to remove "save" link and release objectid
 295                          */
 296                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 297                                          &obj_key);
 298                         retval = remove_save_link_only(s, &save_link_key, 1);
 299                         continue;
 300                 }
 301
 302                 if (!truncate && inode->i_nlink) {
 303                         /* file is not unlinked */
 304                         reiserfs_warning(s, "vs-2185",
 305                                          "file %K is not unlinked",
 306                                          &obj_key);
 307                         retval = remove_save_link_only(s, &save_link_key, 0);
 308                         continue;
 309                 }
 310                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 311                 dquot_initialize(inode);
 312                 reiserfs_write_lock_nested(inode->i_sb, depth);
 313
 314                 if (truncate && S_ISDIR(inode->i_mode)) {
 315                         /*
 316                          * We got a truncate request for a dir which
 317                          * is impossible.  The only imaginable way is to
 318                          * execute unfinished truncate request then boot
 319                          * into old kernel, remove the file and create dir
 320                          * with the same key.
 321                          */
 322                         reiserfs_warning(s, "green-2101",
 323                                          "impossible truncate on a "
 324                                          "directory %k. Please report",
 325                                          INODE_PKEY(inode));
 326                         retval = remove_save_link_only(s, &save_link_key, 0);
 327                         truncate = 0;
 328                         iput(inode);
 329                         continue;
 330                 }
 331
 332                 if (truncate) {
 333                         REISERFS_I(inode)->i_flags |=
 334                             i_link_saved_truncate_mask;
 335                         /*
 336                          * not completed truncate found. New size was
 337                          * committed together with "save" link
 338                          */
 339                         reiserfs_info(s, "Truncating %k to %lld ..",
 340                                       INODE_PKEY(inode), inode->i_size);
 341
 342                         /* don't update modification time */
 343                         reiserfs_truncate_file(inode, 0);
 344
 345                         retval = remove_save_link(inode, truncate);
 346                 } else {
 347                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 348                         /* not completed unlink (rmdir) found */
 349                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 350                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 351                                         sizeof(last_inode_key))){
 352                                 last_inode_key = *INODE_PKEY(inode);
 353                                 /* removal gets completed in iput */
 354                                 retval = 0;
 355                         } else {
 356                                 reiserfs_warning(s, "super-2189", "Dead loop "
 357                                                  "in finish_unfinished "
 358                                                  "detected, just remove "
 359                                                  "save link\n");
 360                                 retval = remove_save_link_only(s,
 361                                                         &save_link_key, 0);
 362                         }
 363                 }
 364
 365                 iput(inode);
 366                 printk("done\n");
 367                 done++;
 368         }
 369         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 370
 371 #ifdef CONFIG_QUOTA
 372         /* Turn quotas off */
 373         reiserfs_write_unlock(s);
 374         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 375                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 376                         dquot_quota_off(s, i);
 377         }
 378         reiserfs_write_lock(s);
 379         if (ms_active_set)
 380                 /* Restore the flag back */
 381                 s->s_flags &= ~MS_ACTIVE;
 382 #endif
 383         pathrelse(&path);
 384         if (done)
 385                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 386                               "Completed\n", done);
 387         return retval;
 388 }
 389
 390 /*
 391  * to protect file being unlinked from getting lost we "safe" link files
 392  * being unlinked. This link will be deleted in the same transaction with last
 393  * item of file. mounting the filesystem we scan all these links and remove
 394  * files which almost got lost
 395  */
 396 void add_save_link(struct reiserfs_transaction_handle *th,
 397                    struct inode *inode, int truncate)
 398 {
 399         INITIALIZE_PATH(path);
 400         int retval;
 401         struct cpu_key key;
 402         struct item_head ih;
 403         __le32 link;
 404
 405         BUG_ON(!th->t_trans_id);
 406
 407         /* file can only get one "save link" of each kind */
 408         RFALSE(truncate &&
 409                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 410                "saved link already exists for truncated inode %lx",
 411                (long)inode->i_ino);
 412         RFALSE(!truncate &&
 413                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 414                "saved link already exists for unlinked inode %lx",
 415                (long)inode->i_ino);
 416
 417         /* setup key of "save" link */
 418         key.version = KEY_FORMAT_3_5;
 419         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 420         key.on_disk_key.k_objectid = inode->i_ino;
 421         if (!truncate) {
 422                 /* unlink, rmdir, rename */
 423                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 424                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 425
 426                 /* item head of "safe" link */
 427                 make_le_item_head(&ih, &key, key.version,
 428                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 429                                   4 /*length */ , 0xffff /*free space */ );
 430         } else {
 431                 /* truncate */
 432                 if (S_ISDIR(inode->i_mode))
 433                         reiserfs_warning(inode->i_sb, "green-2102",
 434                                          "Adding a truncate savelink for "
 435                                          "a directory %k! Please report",
 436                                          INODE_PKEY(inode));
 437                 set_cpu_key_k_offset(&key, 1);
 438                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 439
 440                 /* item head of "safe" link */
 441                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 442                                   4 /*length */ , 0 /*free space */ );
 443         }
 444         key.key_length = 3;
 445
 446         /* look for its place in the tree */
 447         retval = search_item(inode->i_sb, &key, &path);
 448         if (retval != ITEM_NOT_FOUND) {
 449                 if (retval != -ENOSPC)
 450                         reiserfs_error(inode->i_sb, "vs-2100",
 451                                        "search_by_key (%K) returned %d", &key,
 452                                        retval);
 453                 pathrelse(&path);
 454                 return;
 455         }
 456
 457         /* body of "save" link */
 458         link = INODE_PKEY(inode)->k_dir_id;
 459
 460         /* put "save" link into tree, don't charge quota to anyone */
 461         retval =
 462             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 463         if (retval) {
 464                 if (retval != -ENOSPC)
 465                         reiserfs_error(inode->i_sb, "vs-2120",
 466                                        "insert_item returned %d", retval);
 467         } else {
 468                 if (truncate)
 469                         REISERFS_I(inode)->i_flags |=
 470                             i_link_saved_truncate_mask;
 471                 else
 472                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 473         }
 474 }
 475
 476 /* this opens transaction unlike add_save_link */
 477 int remove_save_link(struct inode *inode, int truncate)
 478 {
 479         struct reiserfs_transaction_handle th;
 480         struct reiserfs_key key;
 481         int err;
 482
 483         /* we are going to do one balancing only */
 484         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 485         if (err)
 486                 return err;
 487
 488         /* setup key of "save" link */
 489         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 490         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 491         if (!truncate) {
 492                 /* unlink, rmdir, rename */
 493                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 494                                     1 + inode->i_sb->s_blocksize);
 495                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 496         } else {
 497                 /* truncate */
 498                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 499                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 500         }
 501
 502         if ((truncate &&
 503              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 504             (!truncate &&
 505              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 506                 /* don't take quota bytes from anywhere */
 507                 reiserfs_delete_solid_item(&th, NULL, &key);
 508         if (!truncate) {
 509                 reiserfs_release_objectid(&th, inode->i_ino);
 510                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 511         } else
 512                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 513
 514         return journal_end(&th);
 515 }
 516
 517 static void reiserfs_kill_sb(struct super_block *s)
 518 {
 519         if (REISERFS_SB(s)) {
 520                 reiserfs_proc_info_done(s);
 521                 /*
 522                  * Force any pending inode evictions to occur now. Any
 523                  * inodes to be removed that have extended attributes
 524                  * associated with them need to clean them up before
 525                  * we can release the extended attribute root dentries.
 526                  * shrink_dcache_for_umount will BUG if we don't release
 527                  * those before it's called so ->put_super is too late.
 528                  */
 529                 shrink_dcache_sb(s);
 530
 531                 dput(REISERFS_SB(s)->xattr_root);
 532                 REISERFS_SB(s)->xattr_root = NULL;
 533                 dput(REISERFS_SB(s)->priv_root);
 534                 REISERFS_SB(s)->priv_root = NULL;
 535         }
 536
 537         kill_block_super(s);
 538 }
 539
 540 static void reiserfs_put_super(struct super_block *s)
 541 {
 542         struct reiserfs_transaction_handle th;
 543         th.t_trans_id = 0;
 544
 545         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 546
 547         reiserfs_write_lock(s);
 548
 549         /*
 550          * change file system state to current state if it was mounted
 551          * with read-write permissions
 552          */
 553         if (!(s->s_flags & MS_RDONLY)) {
 554                 if (!journal_begin(&th, s, 10)) {
 555                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 556                                                      1);
 557                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 558                                             REISERFS_SB(s)->s_mount_state);
 559                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 560                 }
 561         }
 562
 563         /*
 564          * note, journal_release checks for readonly mount, and can
 565          * decide not to do a journal_end
 566          */
 567         journal_release(&th, s);
 568
 569         reiserfs_free_bitmap_cache(s);
 570
 571         brelse(SB_BUFFER_WITH_SB(s));
 572
 573         print_statistics(s);
 574
 575         if (REISERFS_SB(s)->reserved_blocks != 0) {
 576                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 577                                  REISERFS_SB(s)->reserved_blocks);
 578         }
 579
 580         reiserfs_write_unlock(s);
 581         mutex_destroy(&REISERFS_SB(s)->lock);
 582         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 583         kfree(s->s_fs_info);
 584         s->s_fs_info = NULL;
 585 }
 586
 587 static struct kmem_cache *reiserfs_inode_cachep;
 588
 589 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 590 {
 591         struct reiserfs_inode_info *ei;
 592         ei = 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                                                       SLAB_ACCOUNT),
 631                                                   init_once);
 632         if (reiserfs_inode_cachep == NULL)
 633                 return -ENOMEM;
 634         return 0;
 635 }
 636
 637 static void destroy_inodecache(void)
 638 {
 639         /*
 640          * Make sure all delayed rcu free inodes are flushed before we
 641          * destroy cache.
 642          */
 643         rcu_barrier();
 644         kmem_cache_destroy(reiserfs_inode_cachep);
 645 }
 646
 647 /* we don't mark inodes dirty, we just log them */
 648 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 649 {
 650         struct reiserfs_transaction_handle th;
 651
 652         int err = 0;
 653
 654         if (inode->i_sb->s_flags & MS_RDONLY) {
 655                 reiserfs_warning(inode->i_sb, "clm-6006",
 656                                  "writing inode %lu on readonly FS",
 657                                  inode->i_ino);
 658                 return;
 659         }
 660         reiserfs_write_lock(inode->i_sb);
 661
 662         /*
 663          * this is really only used for atime updates, so they don't have
 664          * to be included in O_SYNC or fsync
 665          */
 666         err = journal_begin(&th, inode->i_sb, 1);
 667         if (err)
 668                 goto out;
 669
 670         reiserfs_update_sd(&th, inode);
 671         journal_end(&th);
 672
 673 out:
 674         reiserfs_write_unlock(inode->i_sb);
 675 }
 676
 677 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 678 {
 679         struct super_block *s = root->d_sb;
 680         struct reiserfs_journal *journal = SB_JOURNAL(s);
 681         long opts = REISERFS_SB(s)->s_mount_opt;
 682
 683         if (opts & (1 << REISERFS_LARGETAIL))
 684                 seq_puts(seq, ",tails=on");
 685         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 686                 seq_puts(seq, ",notail");
 687         /* tails=small is default so we don't show it */
 688
 689         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 690                 seq_puts(seq, ",barrier=none");
 691         /* barrier=flush is default so we don't show it */
 692
 693         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 694                 seq_puts(seq, ",errors=continue");
 695         else if (opts & (1 << REISERFS_ERROR_PANIC))
 696                 seq_puts(seq, ",errors=panic");
 697         /* errors=ro is default so we don't show it */
 698
 699         if (opts & (1 << REISERFS_DATA_LOG))
 700                 seq_puts(seq, ",data=journal");
 701         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 702                 seq_puts(seq, ",data=writeback");
 703         /* data=ordered is default so we don't show it */
 704
 705         if (opts & (1 << REISERFS_ATTRS))
 706                 seq_puts(seq, ",attrs");
 707
 708         if (opts & (1 << REISERFS_XATTRS_USER))
 709                 seq_puts(seq, ",user_xattr");
 710
 711         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 712                 seq_puts(seq, ",expose_privroot");
 713
 714         if (opts & (1 << REISERFS_POSIXACL))
 715                 seq_puts(seq, ",acl");
 716
 717         if (REISERFS_SB(s)->s_jdev)
 718                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 719
 720         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 721                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 722
 723 #ifdef CONFIG_QUOTA
 724         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 725                 seq_show_option(seq, "usrjquota",
 726                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 727         else if (opts & (1 << REISERFS_USRQUOTA))
 728                 seq_puts(seq, ",usrquota");
 729         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 730                 seq_show_option(seq, "grpjquota",
 731                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 732         else if (opts & (1 << REISERFS_GRPQUOTA))
 733                 seq_puts(seq, ",grpquota");
 734         if (REISERFS_SB(s)->s_jquota_fmt) {
 735                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 736                         seq_puts(seq, ",jqfmt=vfsold");
 737                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 738                         seq_puts(seq, ",jqfmt=vfsv0");
 739         }
 740 #endif
 741
 742         /* Block allocator options */
 743         if (opts & (1 << REISERFS_NO_BORDER))
 744                 seq_puts(seq, ",block-allocator=noborder");
 745         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 746                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 747         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 748                 seq_puts(seq, ",block-allocator=hashed_relocation");
 749         if (opts & (1 << REISERFS_TEST4))
 750                 seq_puts(seq, ",block-allocator=test4");
 751         show_alloc_options(seq, s);
 752         return 0;
 753 }
 754
 755 #ifdef CONFIG_QUOTA
 756 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 757                                     size_t, loff_t);
 758 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 759                                    loff_t);
 760
 761 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 762 {
 763         return REISERFS_I(inode)->i_dquot;
 764 }
 765 #endif
 766
 767 static const struct super_operations reiserfs_sops = {
 768         .alloc_inode = reiserfs_alloc_inode,
 769         .destroy_inode = reiserfs_destroy_inode,
 770         .write_inode = reiserfs_write_inode,
 771         .dirty_inode = reiserfs_dirty_inode,
 772         .evict_inode = reiserfs_evict_inode,
 773         .put_super = reiserfs_put_super,
 774         .sync_fs = reiserfs_sync_fs,
 775         .freeze_fs = reiserfs_freeze,
 776         .unfreeze_fs = reiserfs_unfreeze,
 777         .statfs = reiserfs_statfs,
 778         .remount_fs = reiserfs_remount,
 779         .show_options = reiserfs_show_options,
 780 #ifdef CONFIG_QUOTA
 781         .quota_read = reiserfs_quota_read,
 782         .quota_write = reiserfs_quota_write,
 783         .get_dquots = reiserfs_get_dquots,
 784 #endif
 785 };
 786
 787 #ifdef CONFIG_QUOTA
 788 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 789
 790 static int reiserfs_write_dquot(struct dquot *);
 791 static int reiserfs_acquire_dquot(struct dquot *);
 792 static int reiserfs_release_dquot(struct dquot *);
 793 static int reiserfs_mark_dquot_dirty(struct dquot *);
 794 static int reiserfs_write_info(struct super_block *, int);
 795 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 796
 797 static const struct dquot_operations reiserfs_quota_operations = {
 798         .write_dquot = reiserfs_write_dquot,
 799         .acquire_dquot = reiserfs_acquire_dquot,
 800         .release_dquot = reiserfs_release_dquot,
 801         .mark_dirty = reiserfs_mark_dquot_dirty,
 802         .write_info = reiserfs_write_info,
 803         .alloc_dquot    = dquot_alloc,
 804         .destroy_dquot  = dquot_destroy,
 805         .get_next_id    = dquot_get_next_id,
 806 };
 807
 808 static const struct quotactl_ops reiserfs_qctl_operations = {
 809         .quota_on = reiserfs_quota_on,
 810         .quota_off = dquot_quota_off,
 811         .quota_sync = dquot_quota_sync,
 812         .get_state = dquot_get_state,
 813         .set_info = dquot_set_dqinfo,
 814         .get_dqblk = dquot_get_dqblk,
 815         .set_dqblk = dquot_set_dqblk,
 816 };
 817 #endif
 818
 819 static const struct export_operations reiserfs_export_ops = {
 820         .encode_fh = reiserfs_encode_fh,
 821         .fh_to_dentry = reiserfs_fh_to_dentry,
 822         .fh_to_parent = reiserfs_fh_to_parent,
 823         .get_parent = reiserfs_get_parent,
 824 };
 825
 826 /*
 827  * this struct is used in reiserfs_getopt () for containing the value for
 828  * those mount options that have values rather than being toggles.
 829  */
 830 typedef struct {
 831         char *value;
 832         /*
 833          * bitmask which is to set on mount_options bitmask
 834          * when this value is found, 0 is no bits are to be changed.
 835          */
 836         int setmask;
 837         /*
 838          * bitmask which is to clear on mount_options bitmask
 839          * when this value is found, 0 is no bits are to be changed.
 840          * This is applied BEFORE setmask
 841          */
 842         int clrmask;
 843 } arg_desc_t;
 844
 845 /* Set this bit in arg_required to allow empty arguments */
 846 #define REISERFS_OPT_ALLOWEMPTY 31
 847
 848 /*
 849  * this struct is used in reiserfs_getopt() for describing the
 850  * set of reiserfs mount options
 851  */
 852 typedef struct {
 853         char *option_name;
 854
 855         /* 0 if argument is not required, not 0 otherwise */
 856         int arg_required;
 857
 858         /* list of values accepted by an option */
 859         const arg_desc_t *values;
 860
 861         /*
 862          * bitmask which is to set on mount_options bitmask
 863          * when this value is found, 0 is no bits are to be changed.
 864          */
 865         int setmask;
 866
 867         /*
 868          * bitmask which is to clear on mount_options bitmask
 869          * when this value is found, 0 is no bits are to be changed.
 870          * This is applied BEFORE setmask
 871          */
 872         int clrmask;
 873 } opt_desc_t;
 874
 875 /* possible values for -o data= */
 876 static const arg_desc_t logging_mode[] = {
 877         {"ordered", 1 << REISERFS_DATA_ORDERED,
 878          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 879         {"journal", 1 << REISERFS_DATA_LOG,
 880          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 881         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 882          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 883         {.value = NULL}
 884 };
 885
 886 /* possible values for -o barrier= */
 887 static const arg_desc_t barrier_mode[] = {
 888         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 889         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 890         {.value = NULL}
 891 };
 892
 893 /*
 894  * possible values for "-o block-allocator=" and bits which are to be set in
 895  * s_mount_opt of reiserfs specific part of in-core super block
 896  */
 897 static const arg_desc_t balloc[] = {
 898         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 899         {"border", 0, 1 << REISERFS_NO_BORDER},
 900         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 901         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 902         {"test4", 1 << REISERFS_TEST4, 0},
 903         {"notest4", 0, 1 << REISERFS_TEST4},
 904         {NULL, 0, 0}
 905 };
 906
 907 static const arg_desc_t tails[] = {
 908         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 909         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 910         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 911         {NULL, 0, 0}
 912 };
 913
 914 static const arg_desc_t error_actions[] = {
 915         {"panic", 1 << REISERFS_ERROR_PANIC,
 916          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 917         {"ro-remount", 1 << REISERFS_ERROR_RO,
 918          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 919 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 920         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 921          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 922 #endif
 923         {NULL, 0, 0},
 924 };
 925
 926 /*
 927  * proceed only one option from a list *cur - string containing of mount
 928  * options
 929  * opts - array of options which are accepted
 930  * opt_arg - if option is found and requires an argument and if it is specifed
 931  * in the input - pointer to the argument is stored here
 932  * bit_flags - if option requires to set a certain bit - it is set here
 933  * return -1 if unknown option is found, opt->arg_required otherwise
 934  */
 935 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 936                            char **opt_arg, unsigned long *bit_flags)
 937 {
 938         char *p;
 939         /*
 940          * foo=bar,
 941          * ^   ^  ^
 942          * |   |  +-- option_end
 943          * |   +-- arg_start
 944          * +-- option_start
 945          */
 946         const opt_desc_t *opt;
 947         const arg_desc_t *arg;
 948
 949         p = *cur;
 950
 951         /* assume argument cannot contain commas */
 952         *cur = strchr(p, ',');
 953         if (*cur) {
 954                 *(*cur) = '\0';
 955                 (*cur)++;
 956         }
 957
 958         if (!strncmp(p, "alloc=", 6)) {
 959                 /*
 960                  * Ugly special case, probably we should redo options
 961                  * parser so that it can understand several arguments for
 962                  * some options, also so that it can fill several bitfields
 963                  * with option values.
 964                  */
 965                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 966                         return -1;
 967                 } else {
 968                         return 0;
 969                 }
 970         }
 971
 972         /* for every option in the list */
 973         for (opt = opts; opt->option_name; opt++) {
 974                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 975                         if (bit_flags) {
 976                                 if (opt->clrmask ==
 977                                     (1 << REISERFS_UNSUPPORTED_OPT))
 978                                         reiserfs_warning(s, "super-6500",
 979                                                          "%s not supported.\n",
 980                                                          p);
 981                                 else
 982                                         *bit_flags &= ~opt->clrmask;
 983                                 if (opt->setmask ==
 984                                     (1 << REISERFS_UNSUPPORTED_OPT))
 985                                         reiserfs_warning(s, "super-6501",
 986                                                          "%s not supported.\n",
 987                                                          p);
 988                                 else
 989                                         *bit_flags |= opt->setmask;
 990                         }
 991                         break;
 992                 }
 993         }
 994         if (!opt->option_name) {
 995                 reiserfs_warning(s, "super-6502",
 996                                  "unknown mount option \"%s\"", p);
 997                 return -1;
 998         }
 999
1000         p += strlen(opt->option_name);
1001         switch (*p) {
1002         case '=':
1003                 if (!opt->arg_required) {
1004                         reiserfs_warning(s, "super-6503",
1005                                          "the option \"%s\" does not "
1006                                          "require an argument\n",
1007                                          opt->option_name);
1008                         return -1;
1009                 }
1010                 break;
1011
1012         case 0:
1013                 if (opt->arg_required) {
1014                         reiserfs_warning(s, "super-6504",
1015                                          "the option \"%s\" requires an "
1016                                          "argument\n", opt->option_name);
1017                         return -1;
1018                 }
1019                 break;
1020         default:
1021                 reiserfs_warning(s, "super-6505",
1022                                  "head of option \"%s\" is only correct\n",
1023                                  opt->option_name);
1024                 return -1;
1025         }
1026
1027         /*
1028          * move to the argument, or to next option if argument is not
1029          * required
1030          */
1031         p++;
1032
1033         if (opt->arg_required
1034             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1035             && !strlen(p)) {
1036                 /* this catches "option=," if not allowed */
1037                 reiserfs_warning(s, "super-6506",
1038                                  "empty argument for \"%s\"\n",
1039                                  opt->option_name);
1040                 return -1;
1041         }
1042
1043         if (!opt->values) {
1044                 /* *=NULLopt_arg contains pointer to argument */
1045                 *opt_arg = p;
1046                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1047         }
1048
1049         /* values possible for this option are listed in opt->values */
1050         for (arg = opt->values; arg->value; arg++) {
1051                 if (!strcmp(p, arg->value)) {
1052                         if (bit_flags) {
1053                                 *bit_flags &= ~arg->clrmask;
1054                                 *bit_flags |= arg->setmask;
1055                         }
1056                         return opt->arg_required;
1057                 }
1058         }
1059
1060         reiserfs_warning(s, "super-6506",
1061                          "bad value \"%s\" for option \"%s\"\n", p,
1062                          opt->option_name);
1063         return -1;
1064 }
1065
1066 /* returns 0 if something is wrong in option string, 1 - otherwise */
1067 static int reiserfs_parse_options(struct super_block *s,
1068
1069                                   /* string given via mount's -o */
1070                                   char *options,
1071
1072                                   /*
1073                                    * after the parsing phase, contains the
1074                                    * collection of bitflags defining what
1075                                    * mount options were selected.
1076                                    */
1077                                   unsigned long *mount_options,
1078
1079                                   /* strtol-ed from NNN of resize=NNN */
1080                                   unsigned long *blocks,
1081                                   char **jdev_name,
1082                                   unsigned int *commit_max_age,
1083                                   char **qf_names,
1084                                   unsigned int *qfmt)
1085 {
1086         int c;
1087         char *arg = NULL;
1088         char *pos;
1089         opt_desc_t opts[] = {
1090                 /*
1091                  * Compatibility stuff, so that -o notail for old
1092                  * setups still work
1093                  */
1094                 {"tails",.arg_required = 't',.values = tails},
1095                 {"notail",.clrmask =
1096                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1097                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1098                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1099                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1100                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1101 #ifdef CONFIG_REISERFS_FS_XATTR
1102                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1103                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1104 #else
1105                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1106                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1107 #endif
1108 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1109                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1110                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1111 #else
1112                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1113                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1114 #endif
1115                 {.option_name = "nolog"},
1116                 {"replayonly",.setmask = 1 << REPLAYONLY},
1117                 {"block-allocator",.arg_required = 'a',.values = balloc},
1118                 {"data",.arg_required = 'd',.values = logging_mode},
1119                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1120                 {"resize",.arg_required = 'r',.values = NULL},
1121                 {"jdev",.arg_required = 'j',.values = NULL},
1122                 {"nolargeio",.arg_required = 'w',.values = NULL},
1123                 {"commit",.arg_required = 'c',.values = NULL},
1124                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1125                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1126                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1127                 {"errors",.arg_required = 'e',.values = error_actions},
1128                 {"usrjquota",.arg_required =
1129                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1130                 {"grpjquota",.arg_required =
1131                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1132                 {"jqfmt",.arg_required = 'f',.values = NULL},
1133                 {.option_name = NULL}
1134         };
1135
1136         *blocks = 0;
1137         if (!options || !*options)
1138                 /*
1139                  * use default configuration: create tails, journaling on, no
1140                  * conversion to newest format
1141                  */
1142                 return 1;
1143
1144         for (pos = options; pos;) {
1145                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1146                 if (c == -1)
1147                         /* wrong option is given */
1148                         return 0;
1149
1150                 if (c == 'r') {
1151                         char *p;
1152
1153                         p = NULL;
1154                         /* "resize=NNN" or "resize=auto" */
1155
1156                         if (!strcmp(arg, "auto")) {
1157                                 /* From JFS code, to auto-get the size. */
1158                                 *blocks =
1159                                     s->s_bdev->bd_inode->i_size >> s->
1160                                     s_blocksize_bits;
1161                         } else {
1162                                 *blocks = simple_strtoul(arg, &p, 0);
1163                                 if (*p != '\0') {
1164                                         /* NNN does not look like a number */
1165                                         reiserfs_warning(s, "super-6507",
1166                                                          "bad value %s for "
1167                                                          "-oresize\n", arg);
1168                                         return 0;
1169                                 }
1170                         }
1171                 }
1172
1173                 if (c == 'c') {
1174                         char *p = NULL;
1175                         unsigned long val = simple_strtoul(arg, &p, 0);
1176                         /* commit=NNN (time in seconds) */
1177                         if (*p != '\0' || val >= (unsigned int)-1) {
1178                                 reiserfs_warning(s, "super-6508",
1179                                                  "bad value %s for -ocommit\n",
1180                                                  arg);
1181                                 return 0;
1182                         }
1183                         *commit_max_age = (unsigned int)val;
1184                 }
1185
1186                 if (c == 'w') {
1187                         reiserfs_warning(s, "super-6509", "nolargeio option "
1188                                          "is no longer supported");
1189                         return 0;
1190                 }
1191
1192                 if (c == 'j') {
1193                         if (arg && *arg && jdev_name) {
1194                                 /* Hm, already assigned? */
1195                                 if (*jdev_name) {
1196                                         reiserfs_warning(s, "super-6510",
1197                                                          "journal device was "
1198                                                          "already specified to "
1199                                                          "be %s", *jdev_name);
1200                                         return 0;
1201                                 }
1202                                 *jdev_name = arg;
1203                         }
1204                 }
1205 #ifdef CONFIG_QUOTA
1206                 if (c == 'u' || c == 'g') {
1207                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1208
1209                         if (sb_any_quota_loaded(s) &&
1210                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1211                                 reiserfs_warning(s, "super-6511",
1212                                                  "cannot change journaled "
1213                                                  "quota options when quota "
1214                                                  "turned on.");
1215                                 return 0;
1216                         }
1217                         if (*arg) {     /* Some filename specified? */
1218                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1219                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1220                                               arg)) {
1221                                         reiserfs_warning(s, "super-6512",
1222                                                          "%s quota file "
1223                                                          "already specified.",
1224                                                          QTYPE2NAME(qtype));
1225                                         return 0;
1226                                 }
1227                                 if (strchr(arg, '/')) {
1228                                         reiserfs_warning(s, "super-6513",
1229                                                          "quotafile must be "
1230                                                          "on filesystem root.");
1231                                         return 0;
1232                                 }
1233                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1234                                 if (!qf_names[qtype]) {
1235                                         reiserfs_warning(s, "reiserfs-2502",
1236                                                          "not enough memory "
1237                                                          "for storing "
1238                                                          "quotafile name.");
1239                                         return 0;
1240                                 }
1241                                 if (qtype == USRQUOTA)
1242                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1243                                 else
1244                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1245                         } else {
1246                                 if (qf_names[qtype] !=
1247                                     REISERFS_SB(s)->s_qf_names[qtype])
1248                                         kfree(qf_names[qtype]);
1249                                 qf_names[qtype] = NULL;
1250                                 if (qtype == USRQUOTA)
1251                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1252                                 else
1253                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1254                         }
1255                 }
1256                 if (c == 'f') {
1257                         if (!strcmp(arg, "vfsold"))
1258                                 *qfmt = QFMT_VFS_OLD;
1259                         else if (!strcmp(arg, "vfsv0"))
1260                                 *qfmt = QFMT_VFS_V0;
1261                         else {
1262                                 reiserfs_warning(s, "super-6514",
1263                                                  "unknown quota format "
1264                                                  "specified.");
1265                                 return 0;
1266                         }
1267                         if (sb_any_quota_loaded(s) &&
1268                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1269                                 reiserfs_warning(s, "super-6515",
1270                                                  "cannot change journaled "
1271                                                  "quota options when quota "
1272                                                  "turned on.");
1273                                 return 0;
1274                         }
1275                 }
1276 #else
1277                 if (c == 'u' || c == 'g' || c == 'f') {
1278                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1279                                          "quota options not supported.");
1280                         return 0;
1281                 }
1282 #endif
1283         }
1284
1285 #ifdef CONFIG_QUOTA
1286         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1287             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1288                 reiserfs_warning(s, "super-6515",
1289                                  "journaled quota format not specified.");
1290                 return 0;
1291         }
1292         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1293                sb_has_quota_loaded(s, USRQUOTA)) ||
1294             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1295                sb_has_quota_loaded(s, GRPQUOTA))) {
1296                 reiserfs_warning(s, "super-6516", "quota options must "
1297                                  "be present when quota is turned on.");
1298                 return 0;
1299         }
1300 #endif
1301
1302         return 1;
1303 }
1304
1305 static void switch_data_mode(struct super_block *s, unsigned long mode)
1306 {
1307         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1308                                          (1 << REISERFS_DATA_ORDERED) |
1309                                          (1 << REISERFS_DATA_WRITEBACK));
1310         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1311 }
1312
1313 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1314 {
1315         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1316                 if (!reiserfs_data_log(s)) {
1317                         switch_data_mode(s, REISERFS_DATA_LOG);
1318                         reiserfs_info(s, "switching to journaled data mode\n");
1319                 }
1320         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1321                 if (!reiserfs_data_ordered(s)) {
1322                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1323                         reiserfs_info(s, "switching to ordered data mode\n");
1324                 }
1325         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1326                 if (!reiserfs_data_writeback(s)) {
1327                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1328                         reiserfs_info(s, "switching to writeback data mode\n");
1329                 }
1330         }
1331 }
1332
1333 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1334 {
1335         int flush = (1 << REISERFS_BARRIER_FLUSH);
1336         int none = (1 << REISERFS_BARRIER_NONE);
1337         int all_barrier = flush | none;
1338
1339         if (bits & all_barrier) {
1340                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1341                 if (bits & flush) {
1342                         REISERFS_SB(s)->s_mount_opt |= flush;
1343                         printk("reiserfs: enabling write barrier flush mode\n");
1344                 } else if (bits & none) {
1345                         REISERFS_SB(s)->s_mount_opt |= none;
1346                         printk("reiserfs: write barriers turned off\n");
1347                 }
1348         }
1349 }
1350
1351 static void handle_attrs(struct super_block *s)
1352 {
1353         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1354
1355         if (reiserfs_attrs(s)) {
1356                 if (old_format_only(s)) {
1357                         reiserfs_warning(s, "super-6517", "cannot support "
1358                                          "attributes on 3.5.x disk format");
1359                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1360                         return;
1361                 }
1362                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1363                         reiserfs_warning(s, "super-6518", "cannot support "
1364                                          "attributes until flag is set in "
1365                                          "super-block");
1366                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1367                 }
1368         }
1369 }
1370
1371 #ifdef CONFIG_QUOTA
1372 static void handle_quota_files(struct super_block *s, char **qf_names,
1373                                unsigned int *qfmt)
1374 {
1375         int i;
1376
1377         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1378                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1379                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1380                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1381         }
1382         if (*qfmt)
1383                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1384 }
1385 #endif
1386
1387 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1388 {
1389         struct reiserfs_super_block *rs;
1390         struct reiserfs_transaction_handle th;
1391         unsigned long blocks;
1392         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1393         unsigned long safe_mask = 0;
1394         unsigned int commit_max_age = (unsigned int)-1;
1395         struct reiserfs_journal *journal = SB_JOURNAL(s);
1396         char *new_opts;
1397         int err;
1398         char *qf_names[REISERFS_MAXQUOTAS];
1399         unsigned int qfmt = 0;
1400 #ifdef CONFIG_QUOTA
1401         int i;
1402 #endif
1403
1404         new_opts = kstrdup(arg, GFP_KERNEL);
1405         if (arg && !new_opts)
1406                 return -ENOMEM;
1407
1408         sync_filesystem(s);
1409         reiserfs_write_lock(s);
1410
1411 #ifdef CONFIG_QUOTA
1412         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1413 #endif
1414
1415         rs = SB_DISK_SUPER_BLOCK(s);
1416
1417         if (!reiserfs_parse_options
1418             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1419             qf_names, &qfmt)) {
1420 #ifdef CONFIG_QUOTA
1421                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1422                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1423                                 kfree(qf_names[i]);
1424 #endif
1425                 err = -EINVAL;
1426                 goto out_err_unlock;
1427         }
1428 #ifdef CONFIG_QUOTA
1429         handle_quota_files(s, qf_names, &qfmt);
1430 #endif
1431
1432         handle_attrs(s);
1433
1434         /* Add options that are safe here */
1435         safe_mask |= 1 << REISERFS_SMALLTAIL;
1436         safe_mask |= 1 << REISERFS_LARGETAIL;
1437         safe_mask |= 1 << REISERFS_NO_BORDER;
1438         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1439         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1440         safe_mask |= 1 << REISERFS_TEST4;
1441         safe_mask |= 1 << REISERFS_ATTRS;
1442         safe_mask |= 1 << REISERFS_XATTRS_USER;
1443         safe_mask |= 1 << REISERFS_POSIXACL;
1444         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1445         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1446         safe_mask |= 1 << REISERFS_ERROR_RO;
1447         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1448         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1449         safe_mask |= 1 << REISERFS_USRQUOTA;
1450         safe_mask |= 1 << REISERFS_GRPQUOTA;
1451
1452         /*
1453          * Update the bitmask, taking care to keep
1454          * the bits we're not allowed to change here
1455          */
1456         REISERFS_SB(s)->s_mount_opt =
1457             (REISERFS_SB(s)->
1458              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1459
1460         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1461                 journal->j_max_commit_age = commit_max_age;
1462                 journal->j_max_trans_age = commit_max_age;
1463         } else if (commit_max_age == 0) {
1464                 /* 0 means restore defaults. */
1465                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1466                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1467         }
1468
1469         if (blocks) {
1470                 err = reiserfs_resize(s, blocks);
1471                 if (err != 0)
1472                         goto out_err_unlock;
1473         }
1474
1475         if (*mount_flags & MS_RDONLY) {
1476                 reiserfs_write_unlock(s);
1477                 reiserfs_xattr_init(s, *mount_flags);
1478                 /* remount read-only */
1479                 if (s->s_flags & MS_RDONLY)
1480                         /* it is read-only already */
1481                         goto out_ok_unlocked;
1482
1483                 err = dquot_suspend(s, -1);
1484                 if (err < 0)
1485                         goto out_err;
1486
1487                 /* try to remount file system with read-only permissions */
1488                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1489                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1490                         goto out_ok_unlocked;
1491                 }
1492
1493                 reiserfs_write_lock(s);
1494
1495                 err = journal_begin(&th, s, 10);
1496                 if (err)
1497                         goto out_err_unlock;
1498
1499                 /* Mounting a rw partition read-only. */
1500                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1501                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1502                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1503         } else {
1504                 /* remount read-write */
1505                 if (!(s->s_flags & MS_RDONLY)) {
1506                         reiserfs_write_unlock(s);
1507                         reiserfs_xattr_init(s, *mount_flags);
1508                         goto out_ok_unlocked;   /* We are read-write already */
1509                 }
1510
1511                 if (reiserfs_is_journal_aborted(journal)) {
1512                         err = journal->j_errno;
1513                         goto out_err_unlock;
1514                 }
1515
1516                 handle_data_mode(s, mount_options);
1517                 handle_barrier_mode(s, mount_options);
1518                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1519
1520                 /* now it is safe to call journal_begin */
1521                 s->s_flags &= ~MS_RDONLY;
1522                 err = journal_begin(&th, s, 10);
1523                 if (err)
1524                         goto out_err_unlock;
1525
1526                 /* Mount a partition which is read-only, read-write */
1527                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1528                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1529                 s->s_flags &= ~MS_RDONLY;
1530                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1531                 if (!old_format_only(s))
1532                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1533                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1534                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1535                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1536         }
1537         /* this will force a full flush of all journal lists */
1538         SB_JOURNAL(s)->j_must_wait = 1;
1539         err = journal_end(&th);
1540         if (err)
1541                 goto out_err_unlock;
1542
1543         reiserfs_write_unlock(s);
1544         if (!(*mount_flags & MS_RDONLY)) {
1545                 dquot_resume(s, -1);
1546                 reiserfs_write_lock(s);
1547                 finish_unfinished(s);
1548                 reiserfs_write_unlock(s);
1549                 reiserfs_xattr_init(s, *mount_flags);
1550         }
1551
1552 out_ok_unlocked:
1553         if (new_opts)
1554                 replace_mount_options(s, new_opts);
1555         return 0;
1556
1557 out_err_unlock:
1558         reiserfs_write_unlock(s);
1559 out_err:
1560         kfree(new_opts);
1561         return err;
1562 }
1563
1564 static int read_super_block(struct super_block *s, int offset)
1565 {
1566         struct buffer_head *bh;
1567         struct reiserfs_super_block *rs;
1568         int fs_blocksize;
1569
1570         bh = sb_bread(s, offset / s->s_blocksize);
1571         if (!bh) {
1572                 reiserfs_warning(s, "sh-2006",
1573                                  "bread failed (dev %s, block %lu, size %lu)",
1574                                  s->s_id, offset / s->s_blocksize,
1575                                  s->s_blocksize);
1576                 return 1;
1577         }
1578
1579         rs = (struct reiserfs_super_block *)bh->b_data;
1580         if (!is_any_reiserfs_magic_string(rs)) {
1581                 brelse(bh);
1582                 return 1;
1583         }
1584         /*
1585          * ok, reiserfs signature (old or new) found in at the given offset
1586          */
1587         fs_blocksize = sb_blocksize(rs);
1588         brelse(bh);
1589         sb_set_blocksize(s, fs_blocksize);
1590
1591         bh = sb_bread(s, offset / s->s_blocksize);
1592         if (!bh) {
1593                 reiserfs_warning(s, "sh-2007",
1594                                  "bread failed (dev %s, block %lu, size %lu)",
1595                                  s->s_id, offset / s->s_blocksize,
1596                                  s->s_blocksize);
1597                 return 1;
1598         }
1599
1600         rs = (struct reiserfs_super_block *)bh->b_data;
1601         if (sb_blocksize(rs) != s->s_blocksize) {
1602                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1603                                  "filesystem on (dev %s, block %llu, size %lu)",
1604                                  s->s_id,
1605                                  (unsigned long long)bh->b_blocknr,
1606                                  s->s_blocksize);
1607                 brelse(bh);
1608                 return 1;
1609         }
1610
1611         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1612                 brelse(bh);
1613                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1614                                  "--rebuild-tree run detected. Please run\n"
1615                                  "reiserfsck --rebuild-tree and wait for a "
1616                                  "completion. If that fails\n"
1617                                  "get newer reiserfsprogs package");
1618                 return 1;
1619         }
1620
1621         SB_BUFFER_WITH_SB(s) = bh;
1622         SB_DISK_SUPER_BLOCK(s) = rs;
1623
1624         /*
1625          * magic is of non-standard journal filesystem, look at s_version to
1626          * find which format is in use
1627          */
1628         if (is_reiserfs_jr(rs)) {
1629                 if (sb_version(rs) == REISERFS_VERSION_2)
1630                         reiserfs_info(s, "found reiserfs format \"3.6\""
1631                                       " with non-standard journal\n");
1632                 else if (sb_version(rs) == REISERFS_VERSION_1)
1633                         reiserfs_info(s, "found reiserfs format \"3.5\""
1634                                       " with non-standard journal\n");
1635                 else {
1636                         reiserfs_warning(s, "sh-2012", "found unknown "
1637                                          "format \"%u\" of reiserfs with "
1638                                          "non-standard magic", sb_version(rs));
1639                         return 1;
1640                 }
1641         } else
1642                 /*
1643                  * s_version of standard format may contain incorrect
1644                  * information, so we just look at the magic string
1645                  */
1646                 reiserfs_info(s,
1647                               "found reiserfs format \"%s\" with standard journal\n",
1648                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1649
1650         s->s_op = &reiserfs_sops;
1651         s->s_export_op = &reiserfs_export_ops;
1652 #ifdef CONFIG_QUOTA
1653         s->s_qcop = &reiserfs_qctl_operations;
1654         s->dq_op = &reiserfs_quota_operations;
1655         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1656 #endif
1657
1658         /*
1659          * new format is limited by the 32 bit wide i_blocks field, want to
1660          * be one full block below that.
1661          */
1662         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1663         return 0;
1664 }
1665
1666 /* after journal replay, reread all bitmap and super blocks */
1667 static int reread_meta_blocks(struct super_block *s)
1668 {
1669         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1670         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1671         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1672                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1673                 return 1;
1674         }
1675
1676         return 0;
1677 }
1678
1679 /* hash detection stuff */
1680
1681 /*
1682  * if root directory is empty - we set default - Yura's - hash and
1683  * warn about it
1684  * FIXME: we look for only one name in a directory. If tea and yura
1685  * both have the same value - we ask user to send report to the
1686  * mailing list
1687  */
1688 static __u32 find_hash_out(struct super_block *s)
1689 {
1690         int retval;
1691         struct inode *inode;
1692         struct cpu_key key;
1693         INITIALIZE_PATH(path);
1694         struct reiserfs_dir_entry de;
1695         struct reiserfs_de_head *deh;
1696         __u32 hash = DEFAULT_HASH;
1697         __u32 deh_hashval, teahash, r5hash, yurahash;
1698
1699         inode = d_inode(s->s_root);
1700
1701         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1702         retval = search_by_entry_key(s, &key, &path, &de);
1703         if (retval == IO_ERROR) {
1704                 pathrelse(&path);
1705                 return UNSET_HASH;
1706         }
1707         if (retval == NAME_NOT_FOUND)
1708                 de.de_entry_num--;
1709
1710         set_de_name_and_namelen(&de);
1711         deh = de.de_deh + de.de_entry_num;
1712
1713         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1714                 /* allow override in this case */
1715                 if (reiserfs_rupasov_hash(s))
1716                         hash = YURA_HASH;
1717                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1718                 goto out;
1719         }
1720
1721         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1722         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1723         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1724         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1725
1726         if ((teahash == r5hash && deh_hashval == r5hash) ||
1727             (teahash == yurahash && deh_hashval == yurahash) ||
1728             (r5hash == yurahash && deh_hashval == yurahash)) {
1729                 reiserfs_warning(s, "reiserfs-2506",
1730                                  "Unable to automatically detect hash "
1731                                  "function. Please mount with -o "
1732                                  "hash={tea,rupasov,r5}");
1733                 hash = UNSET_HASH;
1734                 goto out;
1735         }
1736
1737         if (deh_hashval == yurahash)
1738                 hash = YURA_HASH;
1739         else if (deh_hashval == teahash)
1740                 hash = TEA_HASH;
1741         else if (deh_hashval == r5hash)
1742                 hash = R5_HASH;
1743         else {
1744                 reiserfs_warning(s, "reiserfs-2506",
1745                                  "Unrecognised hash function");
1746                 hash = UNSET_HASH;
1747         }
1748 out:
1749         pathrelse(&path);
1750         return hash;
1751 }
1752
1753 /* finds out which hash names are sorted with */
1754 static int what_hash(struct super_block *s)
1755 {
1756         __u32 code;
1757
1758         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1759
1760         /*
1761          * reiserfs_hash_detect() == true if any of the hash mount options
1762          * were used.  We must check them to make sure the user isn't
1763          * using a bad hash value
1764          */
1765         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1766                 code = find_hash_out(s);
1767
1768         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1769                 /*
1770                  * detection has found the hash, and we must check against the
1771                  * mount options
1772                  */
1773                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1774                         reiserfs_warning(s, "reiserfs-2507",
1775                                          "Error, %s hash detected, "
1776                                          "unable to force rupasov hash",
1777                                          reiserfs_hashname(code));
1778                         code = UNSET_HASH;
1779                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1780                         reiserfs_warning(s, "reiserfs-2508",
1781                                          "Error, %s hash detected, "
1782                                          "unable to force tea hash",
1783                                          reiserfs_hashname(code));
1784                         code = UNSET_HASH;
1785                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1786                         reiserfs_warning(s, "reiserfs-2509",
1787                                          "Error, %s hash detected, "
1788                                          "unable to force r5 hash",
1789                                          reiserfs_hashname(code));
1790                         code = UNSET_HASH;
1791                 }
1792         } else {
1793                 /*
1794                  * find_hash_out was not called or
1795                  * could not determine the hash
1796                  */
1797                 if (reiserfs_rupasov_hash(s)) {
1798                         code = YURA_HASH;
1799                 } else if (reiserfs_tea_hash(s)) {
1800                         code = TEA_HASH;
1801                 } else if (reiserfs_r5_hash(s)) {
1802                         code = R5_HASH;
1803                 }
1804         }
1805
1806         /*
1807          * if we are mounted RW, and we have a new valid hash code, update
1808          * the super
1809          */
1810         if (code != UNSET_HASH &&
1811             !(s->s_flags & MS_RDONLY) &&
1812             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1813                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1814         }
1815         return code;
1816 }
1817
1818 /* return pointer to appropriate function */
1819 static hashf_t hash_function(struct super_block *s)
1820 {
1821         switch (what_hash(s)) {
1822         case TEA_HASH:
1823                 reiserfs_info(s, "Using tea hash to sort names\n");
1824                 return keyed_hash;
1825         case YURA_HASH:
1826                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1827                 return yura_hash;
1828         case R5_HASH:
1829                 reiserfs_info(s, "Using r5 hash to sort names\n");
1830                 return r5_hash;
1831         }
1832         return NULL;
1833 }
1834
1835 /* this is used to set up correct value for old partitions */
1836 static int function2code(hashf_t func)
1837 {
1838         if (func == keyed_hash)
1839                 return TEA_HASH;
1840         if (func == yura_hash)
1841                 return YURA_HASH;
1842         if (func == r5_hash)
1843                 return R5_HASH;
1844
1845         BUG();                  /* should never happen */
1846
1847         return 0;
1848 }
1849
1850 #define SWARN(silent, s, id, ...)                       \
1851         if (!(silent))                          \
1852                 reiserfs_warning(s, id, __VA_ARGS__)
1853
1854 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1855 {
1856         struct inode *root_inode;
1857         struct reiserfs_transaction_handle th;
1858         int old_format = 0;
1859         unsigned long blocks;
1860         unsigned int commit_max_age = 0;
1861         int jinit_done = 0;
1862         struct reiserfs_iget_args args;
1863         struct reiserfs_super_block *rs;
1864         char *jdev_name;
1865         struct reiserfs_sb_info *sbi;
1866         int errval = -EINVAL;
1867         char *qf_names[REISERFS_MAXQUOTAS] = {};
1868         unsigned int qfmt = 0;
1869
1870         save_mount_options(s, data);
1871
1872         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1873         if (!sbi)
1874                 return -ENOMEM;
1875         s->s_fs_info = sbi;
1876         /* Set default values for options: non-aggressive tails, RO on errors */
1877         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1878         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1879         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1880         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1881         sbi->s_alloc_options.preallocmin = 0;
1882         /* Preallocate by 16 blocks (17-1) at once */
1883         sbi->s_alloc_options.preallocsize = 17;
1884         /* setup default block allocator options */
1885         reiserfs_init_alloc_options(s);
1886
1887         spin_lock_init(&sbi->old_work_lock);
1888         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1889         mutex_init(&sbi->lock);
1890         sbi->lock_depth = -1;
1891
1892         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1893                                          s->s_id);
1894         if (!sbi->commit_wq) {
1895                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1896                 errval = -ENOMEM;
1897                 goto error_unlocked;
1898         }
1899
1900         jdev_name = NULL;
1901         if (reiserfs_parse_options
1902             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1903              &commit_max_age, qf_names, &qfmt) == 0) {
1904                 goto error_unlocked;
1905         }
1906         if (jdev_name && jdev_name[0]) {
1907                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1908                 if (!sbi->s_jdev) {
1909                         SWARN(silent, s, "", "Cannot allocate memory for "
1910                                 "journal device name");
1911                         goto error;
1912                 }
1913         }
1914 #ifdef CONFIG_QUOTA
1915         handle_quota_files(s, qf_names, &qfmt);
1916 #endif
1917
1918         if (blocks) {
1919                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1920                 goto error_unlocked;
1921         }
1922
1923         /*
1924          * try old format (undistributed bitmap, super block in 8-th 1k
1925          * block of a device)
1926          */
1927         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1928                 old_format = 1;
1929
1930         /*
1931          * try new format (64-th 1k block), which can contain reiserfs
1932          * super block
1933          */
1934         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1935                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1936                       s->s_id);
1937                 goto error_unlocked;
1938         }
1939
1940         rs = SB_DISK_SUPER_BLOCK(s);
1941         /*
1942          * Let's do basic sanity check to verify that underlying device is not
1943          * smaller than the filesystem. If the check fails then abort and
1944          * scream, because bad stuff will happen otherwise.
1945          */
1946         if (s->s_bdev && s->s_bdev->bd_inode
1947             && i_size_read(s->s_bdev->bd_inode) <
1948             sb_block_count(rs) * sb_blocksize(rs)) {
1949                 SWARN(silent, s, "", "Filesystem cannot be "
1950                       "mounted because it is bigger than the device");
1951                 SWARN(silent, s, "", "You may need to run fsck "
1952                       "or increase size of your LVM partition");
1953                 SWARN(silent, s, "", "Or may be you forgot to "
1954                       "reboot after fdisk when it told you to");
1955                 goto error_unlocked;
1956         }
1957
1958         sbi->s_mount_state = SB_REISERFS_STATE(s);
1959         sbi->s_mount_state = REISERFS_VALID_FS;
1960
1961         if ((errval = reiserfs_init_bitmap_cache(s))) {
1962                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1963                 goto error_unlocked;
1964         }
1965
1966         errval = -EINVAL;
1967 #ifdef CONFIG_REISERFS_CHECK
1968         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1969         SWARN(silent, s, "", "- it is slow mode for debugging.");
1970 #endif
1971
1972         /* make data=ordered the default */
1973         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1974             !reiserfs_data_writeback(s)) {
1975                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1976         }
1977
1978         if (reiserfs_data_log(s)) {
1979                 reiserfs_info(s, "using journaled data mode\n");
1980         } else if (reiserfs_data_ordered(s)) {
1981                 reiserfs_info(s, "using ordered data mode\n");
1982         } else {
1983                 reiserfs_info(s, "using writeback data mode\n");
1984         }
1985         if (reiserfs_barrier_flush(s)) {
1986                 printk("reiserfs: using flush barriers\n");
1987         }
1988
1989         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1990                 SWARN(silent, s, "sh-2022",
1991                       "unable to initialize journal space");
1992                 goto error_unlocked;
1993         } else {
1994                 /*
1995                  * once this is set, journal_release must be called
1996                  * if we error out of the mount
1997                  */
1998                 jinit_done = 1;
1999         }
2000
2001         if (reread_meta_blocks(s)) {
2002                 SWARN(silent, s, "jmacd-9",
2003                       "unable to reread meta blocks after journal init");
2004                 goto error_unlocked;
2005         }
2006
2007         if (replay_only(s))
2008                 goto error_unlocked;
2009
2010         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2011                 SWARN(silent, s, "clm-7000",
2012                       "Detected readonly device, marking FS readonly");
2013                 s->s_flags |= MS_RDONLY;
2014         }
2015         args.objectid = REISERFS_ROOT_OBJECTID;
2016         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2017         root_inode =
2018             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2019                          reiserfs_init_locked_inode, (void *)&args);
2020         if (!root_inode) {
2021                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2022                 goto error_unlocked;
2023         }
2024
2025         /*
2026          * This path assumed to be called with the BKL in the old times.
2027          * Now we have inherited the big reiserfs lock from it and many
2028          * reiserfs helpers called in the mount path and elsewhere require
2029          * this lock to be held even if it's not always necessary. Let's be
2030          * conservative and hold it early. The window can be reduced after
2031          * careful review of the code.
2032          */
2033         reiserfs_write_lock(s);
2034
2035         if (root_inode->i_state & I_NEW) {
2036                 reiserfs_read_locked_inode(root_inode, &args);
2037                 unlock_new_inode(root_inode);
2038         }
2039
2040         s->s_root = d_make_root(root_inode);
2041         if (!s->s_root)
2042                 goto error;
2043         /* define and initialize hash function */
2044         sbi->s_hash_function = hash_function(s);
2045         if (sbi->s_hash_function == NULL) {
2046                 dput(s->s_root);
2047                 s->s_root = NULL;
2048                 goto error;
2049         }
2050
2051         if (is_reiserfs_3_5(rs)
2052             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2053                 set_bit(REISERFS_3_5, &sbi->s_properties);
2054         else if (old_format)
2055                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2056         else
2057                 set_bit(REISERFS_3_6, &sbi->s_properties);
2058
2059         if (!(s->s_flags & MS_RDONLY)) {
2060
2061                 errval = journal_begin(&th, s, 1);
2062                 if (errval) {
2063                         dput(s->s_root);
2064                         s->s_root = NULL;
2065                         goto error;
2066                 }
2067                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2068
2069                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2070                 set_sb_fs_state(rs, 0);
2071
2072                 /*
2073                  * Clear out s_bmap_nr if it would wrap. We can handle this
2074                  * case, but older revisions can't. This will cause the
2075                  * file system to fail mount on those older implementations,
2076                  * avoiding corruption. -jeffm
2077                  */
2078                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2079                     sb_bmap_nr(rs) != 0) {
2080                         reiserfs_warning(s, "super-2030", "This file system "
2081                                         "claims to use %u bitmap blocks in "
2082                                         "its super block, but requires %u. "
2083                                         "Clearing to zero.", sb_bmap_nr(rs),
2084                                         reiserfs_bmap_count(s));
2085
2086                         set_sb_bmap_nr(rs, 0);
2087                 }
2088
2089                 if (old_format_only(s)) {
2090                         /*
2091                          * filesystem of format 3.5 either with standard
2092                          * or non-standard journal
2093                          */
2094                         if (convert_reiserfs(s)) {
2095                                 /* and -o conv is given */
2096                                 if (!silent)
2097                                         reiserfs_info(s,
2098                                                       "converting 3.5 filesystem to the 3.6 format");
2099
2100                                 if (is_reiserfs_3_5(rs))
2101                                         /*
2102                                          * put magic string of 3.6 format.
2103                                          * 2.2 will not be able to
2104                                          * mount this filesystem anymore
2105                                          */
2106                                         memcpy(rs->s_v1.s_magic,
2107                                                reiserfs_3_6_magic_string,
2108                                                sizeof
2109                                                (reiserfs_3_6_magic_string));
2110
2111                                 set_sb_version(rs, REISERFS_VERSION_2);
2112                                 reiserfs_convert_objectid_map_v1(s);
2113                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2114                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2115                         } else if (!silent) {
2116                                 reiserfs_info(s, "using 3.5.x disk format\n");
2117                         }
2118                 } else
2119                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2120
2121
2122                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2123                 errval = journal_end(&th);
2124                 if (errval) {
2125                         dput(s->s_root);
2126                         s->s_root = NULL;
2127                         goto error;
2128                 }
2129
2130                 reiserfs_write_unlock(s);
2131                 if ((errval = reiserfs_lookup_privroot(s)) ||
2132                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2133                         dput(s->s_root);
2134                         s->s_root = NULL;
2135                         goto error_unlocked;
2136                 }
2137                 reiserfs_write_lock(s);
2138
2139                 /*
2140                  * look for files which were to be removed in previous session
2141                  */
2142                 finish_unfinished(s);
2143         } else {
2144                 if (old_format_only(s) && !silent) {
2145                         reiserfs_info(s, "using 3.5.x disk format\n");
2146                 }
2147
2148                 reiserfs_write_unlock(s);
2149                 if ((errval = reiserfs_lookup_privroot(s)) ||
2150                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2151                         dput(s->s_root);
2152                         s->s_root = NULL;
2153                         goto error_unlocked;
2154                 }
2155                 reiserfs_write_lock(s);
2156         }
2157         /*
2158          * mark hash in super block: it could be unset. overwrite should be ok
2159          */
2160         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2161
2162         handle_attrs(s);
2163
2164         reiserfs_proc_info_init(s);
2165
2166         init_waitqueue_head(&(sbi->s_wait));
2167         spin_lock_init(&sbi->bitmap_lock);
2168
2169         reiserfs_write_unlock(s);
2170
2171         return (0);
2172
2173 error:
2174         reiserfs_write_unlock(s);
2175
2176 error_unlocked:
2177         /* kill the commit thread, free journal ram */
2178         if (jinit_done) {
2179                 reiserfs_write_lock(s);
2180                 journal_release_error(NULL, s);
2181                 reiserfs_write_unlock(s);
2182         }
2183
2184         if (sbi->commit_wq)
2185                 destroy_workqueue(sbi->commit_wq);
2186
2187         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2188
2189         reiserfs_free_bitmap_cache(s);
2190         if (SB_BUFFER_WITH_SB(s))
2191                 brelse(SB_BUFFER_WITH_SB(s));
2192 #ifdef CONFIG_QUOTA
2193         {
2194                 int j;
2195                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2196                         kfree(qf_names[j]);
2197         }
2198 #endif
2199         kfree(sbi);
2200
2201         s->s_fs_info = NULL;
2202         return errval;
2203 }
2204
2205 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2206 {
2207         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2208
2209         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2210         buf->f_bfree = sb_free_blocks(rs);
2211         buf->f_bavail = buf->f_bfree;
2212         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2213         buf->f_bsize = dentry->d_sb->s_blocksize;
2214         /* changed to accommodate gcc folks. */
2215         buf->f_type = REISERFS_SUPER_MAGIC;
2216         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2217         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2218                                 sizeof(rs->s_uuid)/2);
2219
2220         return 0;
2221 }
2222
2223 #ifdef CONFIG_QUOTA
2224 static int reiserfs_write_dquot(struct dquot *dquot)
2225 {
2226         struct reiserfs_transaction_handle th;
2227         int ret, err;
2228         int depth;
2229
2230         reiserfs_write_lock(dquot->dq_sb);
2231         ret =
2232             journal_begin(&th, dquot->dq_sb,
2233                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2234         if (ret)
2235                 goto out;
2236         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2237         ret = dquot_commit(dquot);
2238         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2239         err = journal_end(&th);
2240         if (!ret && err)
2241                 ret = err;
2242 out:
2243         reiserfs_write_unlock(dquot->dq_sb);
2244         return ret;
2245 }
2246
2247 static int reiserfs_acquire_dquot(struct dquot *dquot)
2248 {
2249         struct reiserfs_transaction_handle th;
2250         int ret, err;
2251         int depth;
2252
2253         reiserfs_write_lock(dquot->dq_sb);
2254         ret =
2255             journal_begin(&th, dquot->dq_sb,
2256                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2257         if (ret)
2258                 goto out;
2259         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2260         ret = dquot_acquire(dquot);
2261         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2262         err = journal_end(&th);
2263         if (!ret && err)
2264                 ret = err;
2265 out:
2266         reiserfs_write_unlock(dquot->dq_sb);
2267         return ret;
2268 }
2269
2270 static int reiserfs_release_dquot(struct dquot *dquot)
2271 {
2272         struct reiserfs_transaction_handle th;
2273         int ret, err;
2274
2275         reiserfs_write_lock(dquot->dq_sb);
2276         ret =
2277             journal_begin(&th, dquot->dq_sb,
2278                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2279         reiserfs_write_unlock(dquot->dq_sb);
2280         if (ret) {
2281                 /* Release dquot anyway to avoid endless cycle in dqput() */
2282                 dquot_release(dquot);
2283                 goto out;
2284         }
2285         ret = dquot_release(dquot);
2286         reiserfs_write_lock(dquot->dq_sb);
2287         err = journal_end(&th);
2288         if (!ret && err)
2289                 ret = err;
2290         reiserfs_write_unlock(dquot->dq_sb);
2291 out:
2292         return ret;
2293 }
2294
2295 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2296 {
2297         /* Are we journaling quotas? */
2298         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2299             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2300                 dquot_mark_dquot_dirty(dquot);
2301                 return reiserfs_write_dquot(dquot);
2302         } else
2303                 return dquot_mark_dquot_dirty(dquot);
2304 }
2305
2306 static int reiserfs_write_info(struct super_block *sb, int type)
2307 {
2308         struct reiserfs_transaction_handle th;
2309         int ret, err;
2310         int depth;
2311
2312         /* Data block + inode block */
2313         reiserfs_write_lock(sb);
2314         ret = journal_begin(&th, sb, 2);
2315         if (ret)
2316                 goto out;
2317         depth = reiserfs_write_unlock_nested(sb);
2318         ret = dquot_commit_info(sb, type);
2319         reiserfs_write_lock_nested(sb, depth);
2320         err = journal_end(&th);
2321         if (!ret && err)
2322                 ret = err;
2323 out:
2324         reiserfs_write_unlock(sb);
2325         return ret;
2326 }
2327
2328 /*
2329  * Turn on quotas during mount time - we need to find the quota file and such...
2330  */
2331 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2332 {
2333         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2334                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2335 }
2336
2337 /*
2338  * Standard function to be called on quota_on
2339  */
2340 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2341                              struct path *path)
2342 {
2343         int err;
2344         struct inode *inode;
2345         struct reiserfs_transaction_handle th;
2346         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2347
2348         reiserfs_write_lock(sb);
2349         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2350                 err = -EINVAL;
2351                 goto out;
2352         }
2353
2354         /* Quotafile not on the same filesystem? */
2355         if (path->dentry->d_sb != sb) {
2356                 err = -EXDEV;
2357                 goto out;
2358         }
2359         inode = d_inode(path->dentry);
2360         /*
2361          * We must not pack tails for quota files on reiserfs for quota
2362          * IO to work
2363          */
2364         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2365                 err = reiserfs_unpack(inode, NULL);
2366                 if (err) {
2367                         reiserfs_warning(sb, "super-6520",
2368                                 "Unpacking tail of quota file failed"
2369                                 " (%d). Cannot turn on quotas.", err);
2370                         err = -EINVAL;
2371                         goto out;
2372                 }
2373                 mark_inode_dirty(inode);
2374         }
2375         /* Journaling quota? */
2376         if (REISERFS_SB(sb)->s_qf_names[type]) {
2377                 /* Quotafile not of fs root? */
2378                 if (path->dentry->d_parent != sb->s_root)
2379                         reiserfs_warning(sb, "super-6521",
2380                                  "Quota file not on filesystem root. "
2381                                  "Journalled quota will not work.");
2382         }
2383
2384         /*
2385          * When we journal data on quota file, we have to flush journal to see
2386          * all updates to the file when we bypass pagecache...
2387          */
2388         if (reiserfs_file_data_log(inode)) {
2389                 /* Just start temporary transaction and finish it */
2390                 err = journal_begin(&th, sb, 1);
2391                 if (err)
2392                         goto out;
2393                 err = journal_end_sync(&th);
2394                 if (err)
2395                         goto out;
2396         }
2397         reiserfs_write_unlock(sb);
2398         return dquot_quota_on(sb, type, format_id, path);
2399 out:
2400         reiserfs_write_unlock(sb);
2401         return err;
2402 }
2403
2404 /*
2405  * Read data from quotafile - avoid pagecache and such because we cannot afford
2406  * acquiring the locks... As quota files are never truncated and quota code
2407  * itself serializes the operations (and no one else should touch the files)
2408  * we don't have to be afraid of races
2409  */
2410 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2411                                    size_t len, loff_t off)
2412 {
2413         struct inode *inode = sb_dqopt(sb)->files[type];
2414         unsigned long blk = off >> sb->s_blocksize_bits;
2415         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2416         size_t toread;
2417         struct buffer_head tmp_bh, *bh;
2418         loff_t i_size = i_size_read(inode);
2419
2420         if (off > i_size)
2421                 return 0;
2422         if (off + len > i_size)
2423                 len = i_size - off;
2424         toread = len;
2425         while (toread > 0) {
2426                 tocopy =
2427                     sb->s_blocksize - offset <
2428                     toread ? sb->s_blocksize - offset : toread;
2429                 tmp_bh.b_state = 0;
2430                 /*
2431                  * Quota files are without tails so we can safely
2432                  * use this function
2433                  */
2434                 reiserfs_write_lock(sb);
2435                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2436                 reiserfs_write_unlock(sb);
2437                 if (err)
2438                         return err;
2439                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2440                         memset(data, 0, tocopy);
2441                 else {
2442                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2443                         if (!bh)
2444                                 return -EIO;
2445                         memcpy(data, bh->b_data + offset, tocopy);
2446                         brelse(bh);
2447                 }
2448                 offset = 0;
2449                 toread -= tocopy;
2450                 data += tocopy;
2451                 blk++;
2452         }
2453         return len;
2454 }
2455
2456 /*
2457  * Write to quotafile (we know the transaction is already started and has
2458  * enough credits)
2459  */
2460 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2461                                     const char *data, size_t len, loff_t off)
2462 {
2463         struct inode *inode = sb_dqopt(sb)->files[type];
2464         unsigned long blk = off >> sb->s_blocksize_bits;
2465         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2466         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2467         size_t towrite = len;
2468         struct buffer_head tmp_bh, *bh;
2469
2470         if (!current->journal_info) {
2471                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2472                         (unsigned long long)off, (unsigned long long)len);
2473                 return -EIO;
2474         }
2475         while (towrite > 0) {
2476                 tocopy = sb->s_blocksize - offset < towrite ?
2477                     sb->s_blocksize - offset : towrite;
2478                 tmp_bh.b_state = 0;
2479                 reiserfs_write_lock(sb);
2480                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2481                 reiserfs_write_unlock(sb);
2482                 if (err)
2483                         goto out;
2484                 if (offset || tocopy != sb->s_blocksize)
2485                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2486                 else
2487                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2488                 if (!bh) {
2489                         err = -EIO;
2490                         goto out;
2491                 }
2492                 lock_buffer(bh);
2493                 memcpy(bh->b_data + offset, data, tocopy);
2494                 flush_dcache_page(bh->b_page);
2495                 set_buffer_uptodate(bh);
2496                 unlock_buffer(bh);
2497                 reiserfs_write_lock(sb);
2498                 reiserfs_prepare_for_journal(sb, bh, 1);
2499                 journal_mark_dirty(current->journal_info, bh);
2500                 if (!journal_quota)
2501                         reiserfs_add_ordered_list(inode, bh);
2502                 reiserfs_write_unlock(sb);
2503                 brelse(bh);
2504                 offset = 0;
2505                 towrite -= tocopy;
2506                 data += tocopy;
2507                 blk++;
2508         }
2509 out:
2510         if (len == towrite)
2511                 return err;
2512         if (inode->i_size < off + len - towrite)
2513                 i_size_write(inode, off + len - towrite);
2514         inode->i_version++;
2515         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2516         mark_inode_dirty(inode);
2517         return len - towrite;
2518 }
2519
2520 #endif
2521
2522 static struct dentry *get_super_block(struct file_system_type *fs_type,
2523                            int flags, const char *dev_name,
2524                            void *data)
2525 {
2526         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2527 }
2528
2529 static int __init init_reiserfs_fs(void)
2530 {
2531         int ret;
2532
2533         ret = init_inodecache();
2534         if (ret)
2535                 return ret;
2536
2537         reiserfs_proc_info_global_init();
2538
2539         ret = register_filesystem(&reiserfs_fs_type);
2540         if (ret)
2541                 goto out;
2542
2543         return 0;
2544 out:
2545         reiserfs_proc_info_global_done();
2546         destroy_inodecache();
2547
2548         return ret;
2549 }
2550
2551 static void __exit exit_reiserfs_fs(void)
2552 {
2553         reiserfs_proc_info_global_done();
2554         unregister_filesystem(&reiserfs_fs_type);
2555         destroy_inodecache();
2556 }
2557
2558 struct file_system_type reiserfs_fs_type = {
2559         .owner = THIS_MODULE,
2560         .name = "reiserfs",
2561         .mount = get_super_block,
2562         .kill_sb = reiserfs_kill_sb,
2563         .fs_flags = FS_REQUIRES_DEV,
2564 };
2565 MODULE_ALIAS_FS("reiserfs");
2566
2567 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2568 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2569 MODULE_LICENSE("GPL");
2570
2571 module_init(init_reiserfs_fs);
2572 module_exit(exit_reiserfs_fs);