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 /*
 194  * Look for uncompleted unlinks and truncates and complete them
 195  *
 196  * Called with superblock write locked.  If quotas are enabled, we have to
 197  * release/retake lest we call dquot_quota_on_mount(), proceed to
 198  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
 199  * cpu worklets to complete flush_async_commits() that in turn wait for the
 200  * superblock write lock.
 201  */
 202 static int finish_unfinished(struct super_block *s)
 203 {
 204         INITIALIZE_PATH(path);
 205         struct cpu_key max_cpu_key, obj_key;
 206         struct reiserfs_key save_link_key, last_inode_key;
 207         int retval = 0;
 208         struct item_head *ih;
 209         struct buffer_head *bh;
 210         int item_pos;
 211         char *item;
 212         int done;
 213         struct inode *inode;
 214         int truncate;
 215 #ifdef CONFIG_QUOTA
 216         int i;
 217         int ms_active_set;
 218         int quota_enabled[REISERFS_MAXQUOTAS];
 219 #endif
 220
 221         /* compose key to look for "save" links */
 222         max_cpu_key.version = KEY_FORMAT_3_5;
 223         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 224         max_cpu_key.on_disk_key.k_objectid = ~0U;
 225         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 226         max_cpu_key.key_length = 3;
 227
 228         memset(&last_inode_key, 0, sizeof(last_inode_key));
 229
 230 #ifdef CONFIG_QUOTA
 231         /* Needed for iput() to work correctly and not trash data */
 232         if (s->s_flags & MS_ACTIVE) {
 233                 ms_active_set = 0;
 234         } else {
 235                 ms_active_set = 1;
 236                 s->s_flags |= MS_ACTIVE;
 237         }
 238         /* Turn on quotas so that they are updated correctly */
 239         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 240                 quota_enabled[i] = 1;
 241                 if (REISERFS_SB(s)->s_qf_names[i]) {
 242                         int ret;
 243
 244                         if (sb_has_quota_active(s, i)) {
 245                                 quota_enabled[i] = 0;
 246                                 continue;
 247                         }
 248                         reiserfs_write_unlock(s);
 249                         ret = reiserfs_quota_on_mount(s, i);
 250                         reiserfs_write_lock(s);
 251                         if (ret < 0)
 252                                 reiserfs_warning(s, "reiserfs-2500",
 253                                                  "cannot turn on journaled "
 254                                                  "quota: error %d", ret);
 255                 }
 256         }
 257 #endif
 258
 259         done = 0;
 260         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 261         while (!retval) {
 262                 int depth;
 263                 retval = search_item(s, &max_cpu_key, &path);
 264                 if (retval != ITEM_NOT_FOUND) {
 265                         reiserfs_error(s, "vs-2140",
 266                                        "search_by_key returned %d", retval);
 267                         break;
 268                 }
 269
 270                 bh = get_last_bh(&path);
 271                 item_pos = get_item_pos(&path);
 272                 if (item_pos != B_NR_ITEMS(bh)) {
 273                         reiserfs_warning(s, "vs-2060",
 274                                          "wrong position found");
 275                         break;
 276                 }
 277                 item_pos--;
 278                 ih = item_head(bh, item_pos);
 279
 280                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 281                         /* there are no "save" links anymore */
 282                         break;
 283
 284                 save_link_key = ih->ih_key;
 285                 if (is_indirect_le_ih(ih))
 286                         truncate = 1;
 287                 else
 288                         truncate = 0;
 289
 290                 /* reiserfs_iget needs k_dirid and k_objectid only */
 291                 item = ih_item_body(bh, ih);
 292                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 293                 obj_key.on_disk_key.k_objectid =
 294                     le32_to_cpu(ih->ih_key.k_objectid);
 295                 obj_key.on_disk_key.k_offset = 0;
 296                 obj_key.on_disk_key.k_type = 0;
 297
 298                 pathrelse(&path);
 299
 300                 inode = reiserfs_iget(s, &obj_key);
 301                 if (IS_ERR_OR_NULL(inode)) {
 302                         /*
 303                          * the unlink almost completed, it just did not
 304                          * manage to remove "save" link and release objectid
 305                          */
 306                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 307                                          &obj_key);
 308                         retval = remove_save_link_only(s, &save_link_key, 1);
 309                         continue;
 310                 }
 311
 312                 if (!truncate && inode->i_nlink) {
 313                         /* file is not unlinked */
 314                         reiserfs_warning(s, "vs-2185",
 315                                          "file %K is not unlinked",
 316                                          &obj_key);
 317                         retval = remove_save_link_only(s, &save_link_key, 0);
 318                         continue;
 319                 }
 320                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 321                 dquot_initialize(inode);
 322                 reiserfs_write_lock_nested(inode->i_sb, depth);
 323
 324                 if (truncate && S_ISDIR(inode->i_mode)) {
 325                         /*
 326                          * We got a truncate request for a dir which
 327                          * is impossible.  The only imaginable way is to
 328                          * execute unfinished truncate request then boot
 329                          * into old kernel, remove the file and create dir
 330                          * with the same key.
 331                          */
 332                         reiserfs_warning(s, "green-2101",
 333                                          "impossible truncate on a "
 334                                          "directory %k. Please report",
 335                                          INODE_PKEY(inode));
 336                         retval = remove_save_link_only(s, &save_link_key, 0);
 337                         truncate = 0;
 338                         iput(inode);
 339                         continue;
 340                 }
 341
 342                 if (truncate) {
 343                         REISERFS_I(inode)->i_flags |=
 344                             i_link_saved_truncate_mask;
 345                         /*
 346                          * not completed truncate found. New size was
 347                          * committed together with "save" link
 348                          */
 349                         reiserfs_info(s, "Truncating %k to %lld ..",
 350                                       INODE_PKEY(inode), inode->i_size);
 351
 352                         /* don't update modification time */
 353                         reiserfs_truncate_file(inode, 0);
 354
 355                         retval = remove_save_link(inode, truncate);
 356                 } else {
 357                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 358                         /* not completed unlink (rmdir) found */
 359                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 360                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 361                                         sizeof(last_inode_key))){
 362                                 last_inode_key = *INODE_PKEY(inode);
 363                                 /* removal gets completed in iput */
 364                                 retval = 0;
 365                         } else {
 366                                 reiserfs_warning(s, "super-2189", "Dead loop "
 367                                                  "in finish_unfinished "
 368                                                  "detected, just remove "
 369                                                  "save link\n");
 370                                 retval = remove_save_link_only(s,
 371                                                         &save_link_key, 0);
 372                         }
 373                 }
 374
 375                 iput(inode);
 376                 printk("done\n");
 377                 done++;
 378         }
 379         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 380
 381 #ifdef CONFIG_QUOTA
 382         /* Turn quotas off */
 383         reiserfs_write_unlock(s);
 384         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 385                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 386                         dquot_quota_off(s, i);
 387         }
 388         reiserfs_write_lock(s);
 389         if (ms_active_set)
 390                 /* Restore the flag back */
 391                 s->s_flags &= ~MS_ACTIVE;
 392 #endif
 393         pathrelse(&path);
 394         if (done)
 395                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 396                               "Completed\n", done);
 397         return retval;
 398 }
 399
 400 /*
 401  * to protect file being unlinked from getting lost we "safe" link files
 402  * being unlinked. This link will be deleted in the same transaction with last
 403  * item of file. mounting the filesystem we scan all these links and remove
 404  * files which almost got lost
 405  */
 406 void add_save_link(struct reiserfs_transaction_handle *th,
 407                    struct inode *inode, int truncate)
 408 {
 409         INITIALIZE_PATH(path);
 410         int retval;
 411         struct cpu_key key;
 412         struct item_head ih;
 413         __le32 link;
 414
 415         BUG_ON(!th->t_trans_id);
 416
 417         /* file can only get one "save link" of each kind */
 418         RFALSE(truncate &&
 419                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 420                "saved link already exists for truncated inode %lx",
 421                (long)inode->i_ino);
 422         RFALSE(!truncate &&
 423                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 424                "saved link already exists for unlinked inode %lx",
 425                (long)inode->i_ino);
 426
 427         /* setup key of "save" link */
 428         key.version = KEY_FORMAT_3_5;
 429         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 430         key.on_disk_key.k_objectid = inode->i_ino;
 431         if (!truncate) {
 432                 /* unlink, rmdir, rename */
 433                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 434                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 435
 436                 /* item head of "safe" link */
 437                 make_le_item_head(&ih, &key, key.version,
 438                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 439                                   4 /*length */ , 0xffff /*free space */ );
 440         } else {
 441                 /* truncate */
 442                 if (S_ISDIR(inode->i_mode))
 443                         reiserfs_warning(inode->i_sb, "green-2102",
 444                                          "Adding a truncate savelink for "
 445                                          "a directory %k! Please report",
 446                                          INODE_PKEY(inode));
 447                 set_cpu_key_k_offset(&key, 1);
 448                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 449
 450                 /* item head of "safe" link */
 451                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 452                                   4 /*length */ , 0 /*free space */ );
 453         }
 454         key.key_length = 3;
 455
 456         /* look for its place in the tree */
 457         retval = search_item(inode->i_sb, &key, &path);
 458         if (retval != ITEM_NOT_FOUND) {
 459                 if (retval != -ENOSPC)
 460                         reiserfs_error(inode->i_sb, "vs-2100",
 461                                        "search_by_key (%K) returned %d", &key,
 462                                        retval);
 463                 pathrelse(&path);
 464                 return;
 465         }
 466
 467         /* body of "save" link */
 468         link = INODE_PKEY(inode)->k_dir_id;
 469
 470         /* put "save" link into tree, don't charge quota to anyone */
 471         retval =
 472             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 473         if (retval) {
 474                 if (retval != -ENOSPC)
 475                         reiserfs_error(inode->i_sb, "vs-2120",
 476                                        "insert_item returned %d", retval);
 477         } else {
 478                 if (truncate)
 479                         REISERFS_I(inode)->i_flags |=
 480                             i_link_saved_truncate_mask;
 481                 else
 482                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 483         }
 484 }
 485
 486 /* this opens transaction unlike add_save_link */
 487 int remove_save_link(struct inode *inode, int truncate)
 488 {
 489         struct reiserfs_transaction_handle th;
 490         struct reiserfs_key key;
 491         int err;
 492
 493         /* we are going to do one balancing only */
 494         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 495         if (err)
 496                 return err;
 497
 498         /* setup key of "save" link */
 499         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 500         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 501         if (!truncate) {
 502                 /* unlink, rmdir, rename */
 503                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 504                                     1 + inode->i_sb->s_blocksize);
 505                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 506         } else {
 507                 /* truncate */
 508                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 509                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 510         }
 511
 512         if ((truncate &&
 513              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 514             (!truncate &&
 515              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 516                 /* don't take quota bytes from anywhere */
 517                 reiserfs_delete_solid_item(&th, NULL, &key);
 518         if (!truncate) {
 519                 reiserfs_release_objectid(&th, inode->i_ino);
 520                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 521         } else
 522                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 523
 524         return journal_end(&th);
 525 }
 526
 527 static void reiserfs_kill_sb(struct super_block *s)
 528 {
 529         if (REISERFS_SB(s)) {
 530                 reiserfs_proc_info_done(s);
 531                 /*
 532                  * Force any pending inode evictions to occur now. Any
 533                  * inodes to be removed that have extended attributes
 534                  * associated with them need to clean them up before
 535                  * we can release the extended attribute root dentries.
 536                  * shrink_dcache_for_umount will BUG if we don't release
 537                  * those before it's called so ->put_super is too late.
 538                  */
 539                 shrink_dcache_sb(s);
 540
 541                 dput(REISERFS_SB(s)->xattr_root);
 542                 REISERFS_SB(s)->xattr_root = NULL;
 543                 dput(REISERFS_SB(s)->priv_root);
 544                 REISERFS_SB(s)->priv_root = NULL;
 545         }
 546
 547         kill_block_super(s);
 548 }
 549
 550 static void reiserfs_put_super(struct super_block *s)
 551 {
 552         struct reiserfs_transaction_handle th;
 553         th.t_trans_id = 0;
 554
 555         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 556
 557         reiserfs_write_lock(s);
 558
 559         /*
 560          * change file system state to current state if it was mounted
 561          * with read-write permissions
 562          */
 563         if (!(s->s_flags & MS_RDONLY)) {
 564                 if (!journal_begin(&th, s, 10)) {
 565                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 566                                                      1);
 567                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 568                                             REISERFS_SB(s)->s_mount_state);
 569                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 570                 }
 571         }
 572
 573         /*
 574          * note, journal_release checks for readonly mount, and can
 575          * decide not to do a journal_end
 576          */
 577         journal_release(&th, s);
 578
 579         reiserfs_free_bitmap_cache(s);
 580
 581         brelse(SB_BUFFER_WITH_SB(s));
 582
 583         print_statistics(s);
 584
 585         if (REISERFS_SB(s)->reserved_blocks != 0) {
 586                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 587                                  REISERFS_SB(s)->reserved_blocks);
 588         }
 589
 590         reiserfs_write_unlock(s);
 591         mutex_destroy(&REISERFS_SB(s)->lock);
 592         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 593         kfree(s->s_fs_info);
 594         s->s_fs_info = NULL;
 595 }
 596
 597 static struct kmem_cache *reiserfs_inode_cachep;
 598
 599 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 600 {
 601         struct reiserfs_inode_info *ei;
 602         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 603         if (!ei)
 604                 return NULL;
 605         atomic_set(&ei->openers, 0);
 606         mutex_init(&ei->tailpack);
 607 #ifdef CONFIG_QUOTA
 608         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 609 #endif
 610
 611         return &ei->vfs_inode;
 612 }
 613
 614 static void reiserfs_i_callback(struct rcu_head *head)
 615 {
 616         struct inode *inode = container_of(head, struct inode, i_rcu);
 617         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 618 }
 619
 620 static void reiserfs_destroy_inode(struct inode *inode)
 621 {
 622         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 623 }
 624
 625 static void init_once(void *foo)
 626 {
 627         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 628
 629         INIT_LIST_HEAD(&ei->i_prealloc_list);
 630         inode_init_once(&ei->vfs_inode);
 631 }
 632
 633 static int __init init_inodecache(void)
 634 {
 635         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 636                                                   sizeof(struct
 637                                                          reiserfs_inode_info),
 638                                                   0, (SLAB_RECLAIM_ACCOUNT|
 639                                                       SLAB_MEM_SPREAD|
 640                                                       SLAB_ACCOUNT),
 641                                                   init_once);
 642         if (reiserfs_inode_cachep == NULL)
 643                 return -ENOMEM;
 644         return 0;
 645 }
 646
 647 static void destroy_inodecache(void)
 648 {
 649         /*
 650          * Make sure all delayed rcu free inodes are flushed before we
 651          * destroy cache.
 652          */
 653         rcu_barrier();
 654         kmem_cache_destroy(reiserfs_inode_cachep);
 655 }
 656
 657 /* we don't mark inodes dirty, we just log them */
 658 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 659 {
 660         struct reiserfs_transaction_handle th;
 661
 662         int err = 0;
 663
 664         if (inode->i_sb->s_flags & MS_RDONLY) {
 665                 reiserfs_warning(inode->i_sb, "clm-6006",
 666                                  "writing inode %lu on readonly FS",
 667                                  inode->i_ino);
 668                 return;
 669         }
 670         reiserfs_write_lock(inode->i_sb);
 671
 672         /*
 673          * this is really only used for atime updates, so they don't have
 674          * to be included in O_SYNC or fsync
 675          */
 676         err = journal_begin(&th, inode->i_sb, 1);
 677         if (err)
 678                 goto out;
 679
 680         reiserfs_update_sd(&th, inode);
 681         journal_end(&th);
 682
 683 out:
 684         reiserfs_write_unlock(inode->i_sb);
 685 }
 686
 687 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 688 {
 689         struct super_block *s = root->d_sb;
 690         struct reiserfs_journal *journal = SB_JOURNAL(s);
 691         long opts = REISERFS_SB(s)->s_mount_opt;
 692
 693         if (opts & (1 << REISERFS_LARGETAIL))
 694                 seq_puts(seq, ",tails=on");
 695         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 696                 seq_puts(seq, ",notail");
 697         /* tails=small is default so we don't show it */
 698
 699         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 700                 seq_puts(seq, ",barrier=none");
 701         /* barrier=flush is default so we don't show it */
 702
 703         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 704                 seq_puts(seq, ",errors=continue");
 705         else if (opts & (1 << REISERFS_ERROR_PANIC))
 706                 seq_puts(seq, ",errors=panic");
 707         /* errors=ro is default so we don't show it */
 708
 709         if (opts & (1 << REISERFS_DATA_LOG))
 710                 seq_puts(seq, ",data=journal");
 711         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 712                 seq_puts(seq, ",data=writeback");
 713         /* data=ordered is default so we don't show it */
 714
 715         if (opts & (1 << REISERFS_ATTRS))
 716                 seq_puts(seq, ",attrs");
 717
 718         if (opts & (1 << REISERFS_XATTRS_USER))
 719                 seq_puts(seq, ",user_xattr");
 720
 721         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 722                 seq_puts(seq, ",expose_privroot");
 723
 724         if (opts & (1 << REISERFS_POSIXACL))
 725                 seq_puts(seq, ",acl");
 726
 727         if (REISERFS_SB(s)->s_jdev)
 728                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 729
 730         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 731                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 732
 733 #ifdef CONFIG_QUOTA
 734         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 735                 seq_show_option(seq, "usrjquota",
 736                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 737         else if (opts & (1 << REISERFS_USRQUOTA))
 738                 seq_puts(seq, ",usrquota");
 739         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 740                 seq_show_option(seq, "grpjquota",
 741                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 742         else if (opts & (1 << REISERFS_GRPQUOTA))
 743                 seq_puts(seq, ",grpquota");
 744         if (REISERFS_SB(s)->s_jquota_fmt) {
 745                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 746                         seq_puts(seq, ",jqfmt=vfsold");
 747                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 748                         seq_puts(seq, ",jqfmt=vfsv0");
 749         }
 750 #endif
 751
 752         /* Block allocator options */
 753         if (opts & (1 << REISERFS_NO_BORDER))
 754                 seq_puts(seq, ",block-allocator=noborder");
 755         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 756                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 757         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 758                 seq_puts(seq, ",block-allocator=hashed_relocation");
 759         if (opts & (1 << REISERFS_TEST4))
 760                 seq_puts(seq, ",block-allocator=test4");
 761         show_alloc_options(seq, s);
 762         return 0;
 763 }
 764
 765 #ifdef CONFIG_QUOTA
 766 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 767                                     size_t, loff_t);
 768 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 769                                    loff_t);
 770
 771 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 772 {
 773         return REISERFS_I(inode)->i_dquot;
 774 }
 775 #endif
 776
 777 static const struct super_operations reiserfs_sops = {
 778         .alloc_inode = reiserfs_alloc_inode,
 779         .destroy_inode = reiserfs_destroy_inode,
 780         .write_inode = reiserfs_write_inode,
 781         .dirty_inode = reiserfs_dirty_inode,
 782         .evict_inode = reiserfs_evict_inode,
 783         .put_super = reiserfs_put_super,
 784         .sync_fs = reiserfs_sync_fs,
 785         .freeze_fs = reiserfs_freeze,
 786         .unfreeze_fs = reiserfs_unfreeze,
 787         .statfs = reiserfs_statfs,
 788         .remount_fs = reiserfs_remount,
 789         .show_options = reiserfs_show_options,
 790 #ifdef CONFIG_QUOTA
 791         .quota_read = reiserfs_quota_read,
 792         .quota_write = reiserfs_quota_write,
 793         .get_dquots = reiserfs_get_dquots,
 794 #endif
 795 };
 796
 797 #ifdef CONFIG_QUOTA
 798 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 799
 800 static int reiserfs_write_dquot(struct dquot *);
 801 static int reiserfs_acquire_dquot(struct dquot *);
 802 static int reiserfs_release_dquot(struct dquot *);
 803 static int reiserfs_mark_dquot_dirty(struct dquot *);
 804 static int reiserfs_write_info(struct super_block *, int);
 805 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 806
 807 static const struct dquot_operations reiserfs_quota_operations = {
 808         .write_dquot = reiserfs_write_dquot,
 809         .acquire_dquot = reiserfs_acquire_dquot,
 810         .release_dquot = reiserfs_release_dquot,
 811         .mark_dirty = reiserfs_mark_dquot_dirty,
 812         .write_info = reiserfs_write_info,
 813         .alloc_dquot    = dquot_alloc,
 814         .destroy_dquot  = dquot_destroy,
 815         .get_next_id    = dquot_get_next_id,
 816 };
 817
 818 static const struct quotactl_ops reiserfs_qctl_operations = {
 819         .quota_on = reiserfs_quota_on,
 820         .quota_off = dquot_quota_off,
 821         .quota_sync = dquot_quota_sync,
 822         .get_state = dquot_get_state,
 823         .set_info = dquot_set_dqinfo,
 824         .get_dqblk = dquot_get_dqblk,
 825         .set_dqblk = dquot_set_dqblk,
 826 };
 827 #endif
 828
 829 static const struct export_operations reiserfs_export_ops = {
 830         .encode_fh = reiserfs_encode_fh,
 831         .fh_to_dentry = reiserfs_fh_to_dentry,
 832         .fh_to_parent = reiserfs_fh_to_parent,
 833         .get_parent = reiserfs_get_parent,
 834 };
 835
 836 /*
 837  * this struct is used in reiserfs_getopt () for containing the value for
 838  * those mount options that have values rather than being toggles.
 839  */
 840 typedef struct {
 841         char *value;
 842         /*
 843          * bitmask which is to set on mount_options bitmask
 844          * when this value is found, 0 is no bits are to be changed.
 845          */
 846         int setmask;
 847         /*
 848          * bitmask which is to clear on mount_options bitmask
 849          * when this value is found, 0 is no bits are to be changed.
 850          * This is applied BEFORE setmask
 851          */
 852         int clrmask;
 853 } arg_desc_t;
 854
 855 /* Set this bit in arg_required to allow empty arguments */
 856 #define REISERFS_OPT_ALLOWEMPTY 31
 857
 858 /*
 859  * this struct is used in reiserfs_getopt() for describing the
 860  * set of reiserfs mount options
 861  */
 862 typedef struct {
 863         char *option_name;
 864
 865         /* 0 if argument is not required, not 0 otherwise */
 866         int arg_required;
 867
 868         /* list of values accepted by an option */
 869         const arg_desc_t *values;
 870
 871         /*
 872          * bitmask which is to set on mount_options bitmask
 873          * when this value is found, 0 is no bits are to be changed.
 874          */
 875         int setmask;
 876
 877         /*
 878          * bitmask which is to clear on mount_options bitmask
 879          * when this value is found, 0 is no bits are to be changed.
 880          * This is applied BEFORE setmask
 881          */
 882         int clrmask;
 883 } opt_desc_t;
 884
 885 /* possible values for -o data= */
 886 static const arg_desc_t logging_mode[] = {
 887         {"ordered", 1 << REISERFS_DATA_ORDERED,
 888          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 889         {"journal", 1 << REISERFS_DATA_LOG,
 890          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 891         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 892          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 893         {.value = NULL}
 894 };
 895
 896 /* possible values for -o barrier= */
 897 static const arg_desc_t barrier_mode[] = {
 898         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 899         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 900         {.value = NULL}
 901 };
 902
 903 /*
 904  * possible values for "-o block-allocator=" and bits which are to be set in
 905  * s_mount_opt of reiserfs specific part of in-core super block
 906  */
 907 static const arg_desc_t balloc[] = {
 908         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 909         {"border", 0, 1 << REISERFS_NO_BORDER},
 910         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 911         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 912         {"test4", 1 << REISERFS_TEST4, 0},
 913         {"notest4", 0, 1 << REISERFS_TEST4},
 914         {NULL, 0, 0}
 915 };
 916
 917 static const arg_desc_t tails[] = {
 918         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 919         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 920         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 921         {NULL, 0, 0}
 922 };
 923
 924 static const arg_desc_t error_actions[] = {
 925         {"panic", 1 << REISERFS_ERROR_PANIC,
 926          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 927         {"ro-remount", 1 << REISERFS_ERROR_RO,
 928          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 929 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 930         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 931          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 932 #endif
 933         {NULL, 0, 0},
 934 };
 935
 936 /*
 937  * proceed only one option from a list *cur - string containing of mount
 938  * options
 939  * opts - array of options which are accepted
 940  * opt_arg - if option is found and requires an argument and if it is specifed
 941  * in the input - pointer to the argument is stored here
 942  * bit_flags - if option requires to set a certain bit - it is set here
 943  * return -1 if unknown option is found, opt->arg_required otherwise
 944  */
 945 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 946                            char **opt_arg, unsigned long *bit_flags)
 947 {
 948         char *p;
 949         /*
 950          * foo=bar,
 951          * ^   ^  ^
 952          * |   |  +-- option_end
 953          * |   +-- arg_start
 954          * +-- option_start
 955          */
 956         const opt_desc_t *opt;
 957         const arg_desc_t *arg;
 958
 959         p = *cur;
 960
 961         /* assume argument cannot contain commas */
 962         *cur = strchr(p, ',');
 963         if (*cur) {
 964                 *(*cur) = '\0';
 965                 (*cur)++;
 966         }
 967
 968         if (!strncmp(p, "alloc=", 6)) {
 969                 /*
 970                  * Ugly special case, probably we should redo options
 971                  * parser so that it can understand several arguments for
 972                  * some options, also so that it can fill several bitfields
 973                  * with option values.
 974                  */
 975                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 976                         return -1;
 977                 } else {
 978                         return 0;
 979                 }
 980         }
 981
 982         /* for every option in the list */
 983         for (opt = opts; opt->option_name; opt++) {
 984                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 985                         if (bit_flags) {
 986                                 if (opt->clrmask ==
 987                                     (1 << REISERFS_UNSUPPORTED_OPT))
 988                                         reiserfs_warning(s, "super-6500",
 989                                                          "%s not supported.\n",
 990                                                          p);
 991                                 else
 992                                         *bit_flags &= ~opt->clrmask;
 993                                 if (opt->setmask ==
 994                                     (1 << REISERFS_UNSUPPORTED_OPT))
 995                                         reiserfs_warning(s, "super-6501",
 996                                                          "%s not supported.\n",
 997                                                          p);
 998                                 else
 999                                         *bit_flags |= opt->setmask;
1000                         }
1001                         break;
1002                 }
1003         }
1004         if (!opt->option_name) {
1005                 reiserfs_warning(s, "super-6502",
1006                                  "unknown mount option \"%s\"", p);
1007                 return -1;
1008         }
1009
1010         p += strlen(opt->option_name);
1011         switch (*p) {
1012         case '=':
1013                 if (!opt->arg_required) {
1014                         reiserfs_warning(s, "super-6503",
1015                                          "the option \"%s\" does not "
1016                                          "require an argument\n",
1017                                          opt->option_name);
1018                         return -1;
1019                 }
1020                 break;
1021
1022         case 0:
1023                 if (opt->arg_required) {
1024                         reiserfs_warning(s, "super-6504",
1025                                          "the option \"%s\" requires an "
1026                                          "argument\n", opt->option_name);
1027                         return -1;
1028                 }
1029                 break;
1030         default:
1031                 reiserfs_warning(s, "super-6505",
1032                                  "head of option \"%s\" is only correct\n",
1033                                  opt->option_name);
1034                 return -1;
1035         }
1036
1037         /*
1038          * move to the argument, or to next option if argument is not
1039          * required
1040          */
1041         p++;
1042
1043         if (opt->arg_required
1044             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1045             && !strlen(p)) {
1046                 /* this catches "option=," if not allowed */
1047                 reiserfs_warning(s, "super-6506",
1048                                  "empty argument for \"%s\"\n",
1049                                  opt->option_name);
1050                 return -1;
1051         }
1052
1053         if (!opt->values) {
1054                 /* *=NULLopt_arg contains pointer to argument */
1055                 *opt_arg = p;
1056                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1057         }
1058
1059         /* values possible for this option are listed in opt->values */
1060         for (arg = opt->values; arg->value; arg++) {
1061                 if (!strcmp(p, arg->value)) {
1062                         if (bit_flags) {
1063                                 *bit_flags &= ~arg->clrmask;
1064                                 *bit_flags |= arg->setmask;
1065                         }
1066                         return opt->arg_required;
1067                 }
1068         }
1069
1070         reiserfs_warning(s, "super-6506",
1071                          "bad value \"%s\" for option \"%s\"\n", p,
1072                          opt->option_name);
1073         return -1;
1074 }
1075
1076 /* returns 0 if something is wrong in option string, 1 - otherwise */
1077 static int reiserfs_parse_options(struct super_block *s,
1078
1079                                   /* string given via mount's -o */
1080                                   char *options,
1081
1082                                   /*
1083                                    * after the parsing phase, contains the
1084                                    * collection of bitflags defining what
1085                                    * mount options were selected.
1086                                    */
1087                                   unsigned long *mount_options,
1088
1089                                   /* strtol-ed from NNN of resize=NNN */
1090                                   unsigned long *blocks,
1091                                   char **jdev_name,
1092                                   unsigned int *commit_max_age,
1093                                   char **qf_names,
1094                                   unsigned int *qfmt)
1095 {
1096         int c;
1097         char *arg = NULL;
1098         char *pos;
1099         opt_desc_t opts[] = {
1100                 /*
1101                  * Compatibility stuff, so that -o notail for old
1102                  * setups still work
1103                  */
1104                 {"tails",.arg_required = 't',.values = tails},
1105                 {"notail",.clrmask =
1106                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1107                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1108                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1109                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1110                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1111 #ifdef CONFIG_REISERFS_FS_XATTR
1112                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1113                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1114 #else
1115                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1116                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1117 #endif
1118 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1119                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1120                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1121 #else
1122                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1123                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1124 #endif
1125                 {.option_name = "nolog"},
1126                 {"replayonly",.setmask = 1 << REPLAYONLY},
1127                 {"block-allocator",.arg_required = 'a',.values = balloc},
1128                 {"data",.arg_required = 'd',.values = logging_mode},
1129                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1130                 {"resize",.arg_required = 'r',.values = NULL},
1131                 {"jdev",.arg_required = 'j',.values = NULL},
1132                 {"nolargeio",.arg_required = 'w',.values = NULL},
1133                 {"commit",.arg_required = 'c',.values = NULL},
1134                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1135                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1136                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1137                 {"errors",.arg_required = 'e',.values = error_actions},
1138                 {"usrjquota",.arg_required =
1139                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1140                 {"grpjquota",.arg_required =
1141                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1142                 {"jqfmt",.arg_required = 'f',.values = NULL},
1143                 {.option_name = NULL}
1144         };
1145
1146         *blocks = 0;
1147         if (!options || !*options)
1148                 /*
1149                  * use default configuration: create tails, journaling on, no
1150                  * conversion to newest format
1151                  */
1152                 return 1;
1153
1154         for (pos = options; pos;) {
1155                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1156                 if (c == -1)
1157                         /* wrong option is given */
1158                         return 0;
1159
1160                 if (c == 'r') {
1161                         char *p;
1162
1163                         p = NULL;
1164                         /* "resize=NNN" or "resize=auto" */
1165
1166                         if (!strcmp(arg, "auto")) {
1167                                 /* From JFS code, to auto-get the size. */
1168                                 *blocks =
1169                                     s->s_bdev->bd_inode->i_size >> s->
1170                                     s_blocksize_bits;
1171                         } else {
1172                                 *blocks = simple_strtoul(arg, &p, 0);
1173                                 if (*p != '\0') {
1174                                         /* NNN does not look like a number */
1175                                         reiserfs_warning(s, "super-6507",
1176                                                          "bad value %s for "
1177                                                          "-oresize\n", arg);
1178                                         return 0;
1179                                 }
1180                         }
1181                 }
1182
1183                 if (c == 'c') {
1184                         char *p = NULL;
1185                         unsigned long val = simple_strtoul(arg, &p, 0);
1186                         /* commit=NNN (time in seconds) */
1187                         if (*p != '\0' || val >= (unsigned int)-1) {
1188                                 reiserfs_warning(s, "super-6508",
1189                                                  "bad value %s for -ocommit\n",
1190                                                  arg);
1191                                 return 0;
1192                         }
1193                         *commit_max_age = (unsigned int)val;
1194                 }
1195
1196                 if (c == 'w') {
1197                         reiserfs_warning(s, "super-6509", "nolargeio option "
1198                                          "is no longer supported");
1199                         return 0;
1200                 }
1201
1202                 if (c == 'j') {
1203                         if (arg && *arg && jdev_name) {
1204                                 /* Hm, already assigned? */
1205                                 if (*jdev_name) {
1206                                         reiserfs_warning(s, "super-6510",
1207                                                          "journal device was "
1208                                                          "already specified to "
1209                                                          "be %s", *jdev_name);
1210                                         return 0;
1211                                 }
1212                                 *jdev_name = arg;
1213                         }
1214                 }
1215 #ifdef CONFIG_QUOTA
1216                 if (c == 'u' || c == 'g') {
1217                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1218
1219                         if (sb_any_quota_loaded(s) &&
1220                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1221                                 reiserfs_warning(s, "super-6511",
1222                                                  "cannot change journaled "
1223                                                  "quota options when quota "
1224                                                  "turned on.");
1225                                 return 0;
1226                         }
1227                         if (*arg) {     /* Some filename specified? */
1228                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1229                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1230                                               arg)) {
1231                                         reiserfs_warning(s, "super-6512",
1232                                                          "%s quota file "
1233                                                          "already specified.",
1234                                                          QTYPE2NAME(qtype));
1235                                         return 0;
1236                                 }
1237                                 if (strchr(arg, '/')) {
1238                                         reiserfs_warning(s, "super-6513",
1239                                                          "quotafile must be "
1240                                                          "on filesystem root.");
1241                                         return 0;
1242                                 }
1243                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1244                                 if (!qf_names[qtype]) {
1245                                         reiserfs_warning(s, "reiserfs-2502",
1246                                                          "not enough memory "
1247                                                          "for storing "
1248                                                          "quotafile name.");
1249                                         return 0;
1250                                 }
1251                                 if (qtype == USRQUOTA)
1252                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1253                                 else
1254                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1255                         } else {
1256                                 if (qf_names[qtype] !=
1257                                     REISERFS_SB(s)->s_qf_names[qtype])
1258                                         kfree(qf_names[qtype]);
1259                                 qf_names[qtype] = NULL;
1260                                 if (qtype == USRQUOTA)
1261                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1262                                 else
1263                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1264                         }
1265                 }
1266                 if (c == 'f') {
1267                         if (!strcmp(arg, "vfsold"))
1268                                 *qfmt = QFMT_VFS_OLD;
1269                         else if (!strcmp(arg, "vfsv0"))
1270                                 *qfmt = QFMT_VFS_V0;
1271                         else {
1272                                 reiserfs_warning(s, "super-6514",
1273                                                  "unknown quota format "
1274                                                  "specified.");
1275                                 return 0;
1276                         }
1277                         if (sb_any_quota_loaded(s) &&
1278                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1279                                 reiserfs_warning(s, "super-6515",
1280                                                  "cannot change journaled "
1281                                                  "quota options when quota "
1282                                                  "turned on.");
1283                                 return 0;
1284                         }
1285                 }
1286 #else
1287                 if (c == 'u' || c == 'g' || c == 'f') {
1288                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1289                                          "quota options not supported.");
1290                         return 0;
1291                 }
1292 #endif
1293         }
1294
1295 #ifdef CONFIG_QUOTA
1296         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1297             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1298                 reiserfs_warning(s, "super-6515",
1299                                  "journaled quota format not specified.");
1300                 return 0;
1301         }
1302         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1303                sb_has_quota_loaded(s, USRQUOTA)) ||
1304             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1305                sb_has_quota_loaded(s, GRPQUOTA))) {
1306                 reiserfs_warning(s, "super-6516", "quota options must "
1307                                  "be present when quota is turned on.");
1308                 return 0;
1309         }
1310 #endif
1311
1312         return 1;
1313 }
1314
1315 static void switch_data_mode(struct super_block *s, unsigned long mode)
1316 {
1317         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1318                                          (1 << REISERFS_DATA_ORDERED) |
1319                                          (1 << REISERFS_DATA_WRITEBACK));
1320         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1321 }
1322
1323 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1324 {
1325         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1326                 if (!reiserfs_data_log(s)) {
1327                         switch_data_mode(s, REISERFS_DATA_LOG);
1328                         reiserfs_info(s, "switching to journaled data mode\n");
1329                 }
1330         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1331                 if (!reiserfs_data_ordered(s)) {
1332                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1333                         reiserfs_info(s, "switching to ordered data mode\n");
1334                 }
1335         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1336                 if (!reiserfs_data_writeback(s)) {
1337                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1338                         reiserfs_info(s, "switching to writeback data mode\n");
1339                 }
1340         }
1341 }
1342
1343 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1344 {
1345         int flush = (1 << REISERFS_BARRIER_FLUSH);
1346         int none = (1 << REISERFS_BARRIER_NONE);
1347         int all_barrier = flush | none;
1348
1349         if (bits & all_barrier) {
1350                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1351                 if (bits & flush) {
1352                         REISERFS_SB(s)->s_mount_opt |= flush;
1353                         printk("reiserfs: enabling write barrier flush mode\n");
1354                 } else if (bits & none) {
1355                         REISERFS_SB(s)->s_mount_opt |= none;
1356                         printk("reiserfs: write barriers turned off\n");
1357                 }
1358         }
1359 }
1360
1361 static void handle_attrs(struct super_block *s)
1362 {
1363         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1364
1365         if (reiserfs_attrs(s)) {
1366                 if (old_format_only(s)) {
1367                         reiserfs_warning(s, "super-6517", "cannot support "
1368                                          "attributes on 3.5.x disk format");
1369                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1370                         return;
1371                 }
1372                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1373                         reiserfs_warning(s, "super-6518", "cannot support "
1374                                          "attributes until flag is set in "
1375                                          "super-block");
1376                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1377                 }
1378         }
1379 }
1380
1381 #ifdef CONFIG_QUOTA
1382 static void handle_quota_files(struct super_block *s, char **qf_names,
1383                                unsigned int *qfmt)
1384 {
1385         int i;
1386
1387         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1388                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1389                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1390                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1391         }
1392         if (*qfmt)
1393                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1394 }
1395 #endif
1396
1397 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1398 {
1399         struct reiserfs_super_block *rs;
1400         struct reiserfs_transaction_handle th;
1401         unsigned long blocks;
1402         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1403         unsigned long safe_mask = 0;
1404         unsigned int commit_max_age = (unsigned int)-1;
1405         struct reiserfs_journal *journal = SB_JOURNAL(s);
1406         char *new_opts;
1407         int err;
1408         char *qf_names[REISERFS_MAXQUOTAS];
1409         unsigned int qfmt = 0;
1410 #ifdef CONFIG_QUOTA
1411         int i;
1412 #endif
1413
1414         new_opts = kstrdup(arg, GFP_KERNEL);
1415         if (arg && !new_opts)
1416                 return -ENOMEM;
1417
1418         sync_filesystem(s);
1419         reiserfs_write_lock(s);
1420
1421 #ifdef CONFIG_QUOTA
1422         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1423 #endif
1424
1425         rs = SB_DISK_SUPER_BLOCK(s);
1426
1427         if (!reiserfs_parse_options
1428             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1429             qf_names, &qfmt)) {
1430 #ifdef CONFIG_QUOTA
1431                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1432                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1433                                 kfree(qf_names[i]);
1434 #endif
1435                 err = -EINVAL;
1436                 goto out_err_unlock;
1437         }
1438 #ifdef CONFIG_QUOTA
1439         handle_quota_files(s, qf_names, &qfmt);
1440 #endif
1441
1442         handle_attrs(s);
1443
1444         /* Add options that are safe here */
1445         safe_mask |= 1 << REISERFS_SMALLTAIL;
1446         safe_mask |= 1 << REISERFS_LARGETAIL;
1447         safe_mask |= 1 << REISERFS_NO_BORDER;
1448         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1449         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1450         safe_mask |= 1 << REISERFS_TEST4;
1451         safe_mask |= 1 << REISERFS_ATTRS;
1452         safe_mask |= 1 << REISERFS_XATTRS_USER;
1453         safe_mask |= 1 << REISERFS_POSIXACL;
1454         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1455         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1456         safe_mask |= 1 << REISERFS_ERROR_RO;
1457         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1458         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1459         safe_mask |= 1 << REISERFS_USRQUOTA;
1460         safe_mask |= 1 << REISERFS_GRPQUOTA;
1461
1462         /*
1463          * Update the bitmask, taking care to keep
1464          * the bits we're not allowed to change here
1465          */
1466         REISERFS_SB(s)->s_mount_opt =
1467             (REISERFS_SB(s)->
1468              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1469
1470         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1471                 journal->j_max_commit_age = commit_max_age;
1472                 journal->j_max_trans_age = commit_max_age;
1473         } else if (commit_max_age == 0) {
1474                 /* 0 means restore defaults. */
1475                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1476                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1477         }
1478
1479         if (blocks) {
1480                 err = reiserfs_resize(s, blocks);
1481                 if (err != 0)
1482                         goto out_err_unlock;
1483         }
1484
1485         if (*mount_flags & MS_RDONLY) {
1486                 reiserfs_write_unlock(s);
1487                 reiserfs_xattr_init(s, *mount_flags);
1488                 /* remount read-only */
1489                 if (s->s_flags & MS_RDONLY)
1490                         /* it is read-only already */
1491                         goto out_ok_unlocked;
1492
1493                 err = dquot_suspend(s, -1);
1494                 if (err < 0)
1495                         goto out_err;
1496
1497                 /* try to remount file system with read-only permissions */
1498                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1499                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1500                         goto out_ok_unlocked;
1501                 }
1502
1503                 reiserfs_write_lock(s);
1504
1505                 err = journal_begin(&th, s, 10);
1506                 if (err)
1507                         goto out_err_unlock;
1508
1509                 /* Mounting a rw partition read-only. */
1510                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1511                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1512                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1513         } else {
1514                 /* remount read-write */
1515                 if (!(s->s_flags & MS_RDONLY)) {
1516                         reiserfs_write_unlock(s);
1517                         reiserfs_xattr_init(s, *mount_flags);
1518                         goto out_ok_unlocked;   /* We are read-write already */
1519                 }
1520
1521                 if (reiserfs_is_journal_aborted(journal)) {
1522                         err = journal->j_errno;
1523                         goto out_err_unlock;
1524                 }
1525
1526                 handle_data_mode(s, mount_options);
1527                 handle_barrier_mode(s, mount_options);
1528                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1529
1530                 /* now it is safe to call journal_begin */
1531                 s->s_flags &= ~MS_RDONLY;
1532                 err = journal_begin(&th, s, 10);
1533                 if (err)
1534                         goto out_err_unlock;
1535
1536                 /* Mount a partition which is read-only, read-write */
1537                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1538                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1539                 s->s_flags &= ~MS_RDONLY;
1540                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1541                 if (!old_format_only(s))
1542                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1543                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1544                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1545                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1546         }
1547         /* this will force a full flush of all journal lists */
1548         SB_JOURNAL(s)->j_must_wait = 1;
1549         err = journal_end(&th);
1550         if (err)
1551                 goto out_err_unlock;
1552
1553         reiserfs_write_unlock(s);
1554         if (!(*mount_flags & MS_RDONLY)) {
1555                 dquot_resume(s, -1);
1556                 reiserfs_write_lock(s);
1557                 finish_unfinished(s);
1558                 reiserfs_write_unlock(s);
1559                 reiserfs_xattr_init(s, *mount_flags);
1560         }
1561
1562 out_ok_unlocked:
1563         if (new_opts)
1564                 replace_mount_options(s, new_opts);
1565         return 0;
1566
1567 out_err_unlock:
1568         reiserfs_write_unlock(s);
1569 out_err:
1570         kfree(new_opts);
1571         return err;
1572 }
1573
1574 static int read_super_block(struct super_block *s, int offset)
1575 {
1576         struct buffer_head *bh;
1577         struct reiserfs_super_block *rs;
1578         int fs_blocksize;
1579
1580         bh = sb_bread(s, offset / s->s_blocksize);
1581         if (!bh) {
1582                 reiserfs_warning(s, "sh-2006",
1583                                  "bread failed (dev %s, block %lu, size %lu)",
1584                                  s->s_id, offset / s->s_blocksize,
1585                                  s->s_blocksize);
1586                 return 1;
1587         }
1588
1589         rs = (struct reiserfs_super_block *)bh->b_data;
1590         if (!is_any_reiserfs_magic_string(rs)) {
1591                 brelse(bh);
1592                 return 1;
1593         }
1594         /*
1595          * ok, reiserfs signature (old or new) found in at the given offset
1596          */
1597         fs_blocksize = sb_blocksize(rs);
1598         brelse(bh);
1599         sb_set_blocksize(s, fs_blocksize);
1600
1601         bh = sb_bread(s, offset / s->s_blocksize);
1602         if (!bh) {
1603                 reiserfs_warning(s, "sh-2007",
1604                                  "bread failed (dev %s, block %lu, size %lu)",
1605                                  s->s_id, offset / s->s_blocksize,
1606                                  s->s_blocksize);
1607                 return 1;
1608         }
1609
1610         rs = (struct reiserfs_super_block *)bh->b_data;
1611         if (sb_blocksize(rs) != s->s_blocksize) {
1612                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1613                                  "filesystem on (dev %s, block %llu, size %lu)",
1614                                  s->s_id,
1615                                  (unsigned long long)bh->b_blocknr,
1616                                  s->s_blocksize);
1617                 brelse(bh);
1618                 return 1;
1619         }
1620
1621         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1622                 brelse(bh);
1623                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1624                                  "--rebuild-tree run detected. Please run\n"
1625                                  "reiserfsck --rebuild-tree and wait for a "
1626                                  "completion. If that fails\n"
1627                                  "get newer reiserfsprogs package");
1628                 return 1;
1629         }
1630
1631         SB_BUFFER_WITH_SB(s) = bh;
1632         SB_DISK_SUPER_BLOCK(s) = rs;
1633
1634         /*
1635          * magic is of non-standard journal filesystem, look at s_version to
1636          * find which format is in use
1637          */
1638         if (is_reiserfs_jr(rs)) {
1639                 if (sb_version(rs) == REISERFS_VERSION_2)
1640                         reiserfs_info(s, "found reiserfs format \"3.6\""
1641                                       " with non-standard journal\n");
1642                 else if (sb_version(rs) == REISERFS_VERSION_1)
1643                         reiserfs_info(s, "found reiserfs format \"3.5\""
1644                                       " with non-standard journal\n");
1645                 else {
1646                         reiserfs_warning(s, "sh-2012", "found unknown "
1647                                          "format \"%u\" of reiserfs with "
1648                                          "non-standard magic", sb_version(rs));
1649                         return 1;
1650                 }
1651         } else
1652                 /*
1653                  * s_version of standard format may contain incorrect
1654                  * information, so we just look at the magic string
1655                  */
1656                 reiserfs_info(s,
1657                               "found reiserfs format \"%s\" with standard journal\n",
1658                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1659
1660         s->s_op = &reiserfs_sops;
1661         s->s_export_op = &reiserfs_export_ops;
1662 #ifdef CONFIG_QUOTA
1663         s->s_qcop = &reiserfs_qctl_operations;
1664         s->dq_op = &reiserfs_quota_operations;
1665         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1666 #endif
1667
1668         /*
1669          * new format is limited by the 32 bit wide i_blocks field, want to
1670          * be one full block below that.
1671          */
1672         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1673         return 0;
1674 }
1675
1676 /* after journal replay, reread all bitmap and super blocks */
1677 static int reread_meta_blocks(struct super_block *s)
1678 {
1679         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1680         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1681         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1682                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1683                 return 1;
1684         }
1685
1686         return 0;
1687 }
1688
1689 /* hash detection stuff */
1690
1691 /*
1692  * if root directory is empty - we set default - Yura's - hash and
1693  * warn about it
1694  * FIXME: we look for only one name in a directory. If tea and yura
1695  * both have the same value - we ask user to send report to the
1696  * mailing list
1697  */
1698 static __u32 find_hash_out(struct super_block *s)
1699 {
1700         int retval;
1701         struct inode *inode;
1702         struct cpu_key key;
1703         INITIALIZE_PATH(path);
1704         struct reiserfs_dir_entry de;
1705         struct reiserfs_de_head *deh;
1706         __u32 hash = DEFAULT_HASH;
1707         __u32 deh_hashval, teahash, r5hash, yurahash;
1708
1709         inode = d_inode(s->s_root);
1710
1711         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1712         retval = search_by_entry_key(s, &key, &path, &de);
1713         if (retval == IO_ERROR) {
1714                 pathrelse(&path);
1715                 return UNSET_HASH;
1716         }
1717         if (retval == NAME_NOT_FOUND)
1718                 de.de_entry_num--;
1719
1720         set_de_name_and_namelen(&de);
1721         deh = de.de_deh + de.de_entry_num;
1722
1723         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1724                 /* allow override in this case */
1725                 if (reiserfs_rupasov_hash(s))
1726                         hash = YURA_HASH;
1727                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1728                 goto out;
1729         }
1730
1731         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1732         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1733         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1734         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1735
1736         if ((teahash == r5hash && deh_hashval == r5hash) ||
1737             (teahash == yurahash && deh_hashval == yurahash) ||
1738             (r5hash == yurahash && deh_hashval == yurahash)) {
1739                 reiserfs_warning(s, "reiserfs-2506",
1740                                  "Unable to automatically detect hash "
1741                                  "function. Please mount with -o "
1742                                  "hash={tea,rupasov,r5}");
1743                 hash = UNSET_HASH;
1744                 goto out;
1745         }
1746
1747         if (deh_hashval == yurahash)
1748                 hash = YURA_HASH;
1749         else if (deh_hashval == teahash)
1750                 hash = TEA_HASH;
1751         else if (deh_hashval == r5hash)
1752                 hash = R5_HASH;
1753         else {
1754                 reiserfs_warning(s, "reiserfs-2506",
1755                                  "Unrecognised hash function");
1756                 hash = UNSET_HASH;
1757         }
1758 out:
1759         pathrelse(&path);
1760         return hash;
1761 }
1762
1763 /* finds out which hash names are sorted with */
1764 static int what_hash(struct super_block *s)
1765 {
1766         __u32 code;
1767
1768         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1769
1770         /*
1771          * reiserfs_hash_detect() == true if any of the hash mount options
1772          * were used.  We must check them to make sure the user isn't
1773          * using a bad hash value
1774          */
1775         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1776                 code = find_hash_out(s);
1777
1778         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1779                 /*
1780                  * detection has found the hash, and we must check against the
1781                  * mount options
1782                  */
1783                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1784                         reiserfs_warning(s, "reiserfs-2507",
1785                                          "Error, %s hash detected, "
1786                                          "unable to force rupasov hash",
1787                                          reiserfs_hashname(code));
1788                         code = UNSET_HASH;
1789                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1790                         reiserfs_warning(s, "reiserfs-2508",
1791                                          "Error, %s hash detected, "
1792                                          "unable to force tea hash",
1793                                          reiserfs_hashname(code));
1794                         code = UNSET_HASH;
1795                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1796                         reiserfs_warning(s, "reiserfs-2509",
1797                                          "Error, %s hash detected, "
1798                                          "unable to force r5 hash",
1799                                          reiserfs_hashname(code));
1800                         code = UNSET_HASH;
1801                 }
1802         } else {
1803                 /*
1804                  * find_hash_out was not called or
1805                  * could not determine the hash
1806                  */
1807                 if (reiserfs_rupasov_hash(s)) {
1808                         code = YURA_HASH;
1809                 } else if (reiserfs_tea_hash(s)) {
1810                         code = TEA_HASH;
1811                 } else if (reiserfs_r5_hash(s)) {
1812                         code = R5_HASH;
1813                 }
1814         }
1815
1816         /*
1817          * if we are mounted RW, and we have a new valid hash code, update
1818          * the super
1819          */
1820         if (code != UNSET_HASH &&
1821             !(s->s_flags & MS_RDONLY) &&
1822             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1823                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1824         }
1825         return code;
1826 }
1827
1828 /* return pointer to appropriate function */
1829 static hashf_t hash_function(struct super_block *s)
1830 {
1831         switch (what_hash(s)) {
1832         case TEA_HASH:
1833                 reiserfs_info(s, "Using tea hash to sort names\n");
1834                 return keyed_hash;
1835         case YURA_HASH:
1836                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1837                 return yura_hash;
1838         case R5_HASH:
1839                 reiserfs_info(s, "Using r5 hash to sort names\n");
1840                 return r5_hash;
1841         }
1842         return NULL;
1843 }
1844
1845 /* this is used to set up correct value for old partitions */
1846 static int function2code(hashf_t func)
1847 {
1848         if (func == keyed_hash)
1849                 return TEA_HASH;
1850         if (func == yura_hash)
1851                 return YURA_HASH;
1852         if (func == r5_hash)
1853                 return R5_HASH;
1854
1855         BUG();                  /* should never happen */
1856
1857         return 0;
1858 }
1859
1860 #define SWARN(silent, s, id, ...)                       \
1861         if (!(silent))                          \
1862                 reiserfs_warning(s, id, __VA_ARGS__)
1863
1864 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1865 {
1866         struct inode *root_inode;
1867         struct reiserfs_transaction_handle th;
1868         int old_format = 0;
1869         unsigned long blocks;
1870         unsigned int commit_max_age = 0;
1871         int jinit_done = 0;
1872         struct reiserfs_iget_args args;
1873         struct reiserfs_super_block *rs;
1874         char *jdev_name;
1875         struct reiserfs_sb_info *sbi;
1876         int errval = -EINVAL;
1877         char *qf_names[REISERFS_MAXQUOTAS] = {};
1878         unsigned int qfmt = 0;
1879
1880         save_mount_options(s, data);
1881
1882         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1883         if (!sbi)
1884                 return -ENOMEM;
1885         s->s_fs_info = sbi;
1886         /* Set default values for options: non-aggressive tails, RO on errors */
1887         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1888         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1889         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1890         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1891         sbi->s_alloc_options.preallocmin = 0;
1892         /* Preallocate by 16 blocks (17-1) at once */
1893         sbi->s_alloc_options.preallocsize = 17;
1894         /* setup default block allocator options */
1895         reiserfs_init_alloc_options(s);
1896
1897         spin_lock_init(&sbi->old_work_lock);
1898         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1899         mutex_init(&sbi->lock);
1900         sbi->lock_depth = -1;
1901
1902         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1903                                          s->s_id);
1904         if (!sbi->commit_wq) {
1905                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1906                 errval = -ENOMEM;
1907                 goto error_unlocked;
1908         }
1909
1910         jdev_name = NULL;
1911         if (reiserfs_parse_options
1912             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1913              &commit_max_age, qf_names, &qfmt) == 0) {
1914                 goto error_unlocked;
1915         }
1916         if (jdev_name && jdev_name[0]) {
1917                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1918                 if (!sbi->s_jdev) {
1919                         SWARN(silent, s, "", "Cannot allocate memory for "
1920                                 "journal device name");
1921                         goto error;
1922                 }
1923         }
1924 #ifdef CONFIG_QUOTA
1925         handle_quota_files(s, qf_names, &qfmt);
1926 #endif
1927
1928         if (blocks) {
1929                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1930                 goto error_unlocked;
1931         }
1932
1933         /*
1934          * try old format (undistributed bitmap, super block in 8-th 1k
1935          * block of a device)
1936          */
1937         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1938                 old_format = 1;
1939
1940         /*
1941          * try new format (64-th 1k block), which can contain reiserfs
1942          * super block
1943          */
1944         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1945                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1946                       s->s_id);
1947                 goto error_unlocked;
1948         }
1949
1950         rs = SB_DISK_SUPER_BLOCK(s);
1951         /*
1952          * Let's do basic sanity check to verify that underlying device is not
1953          * smaller than the filesystem. If the check fails then abort and
1954          * scream, because bad stuff will happen otherwise.
1955          */
1956         if (s->s_bdev && s->s_bdev->bd_inode
1957             && i_size_read(s->s_bdev->bd_inode) <
1958             sb_block_count(rs) * sb_blocksize(rs)) {
1959                 SWARN(silent, s, "", "Filesystem cannot be "
1960                       "mounted because it is bigger than the device");
1961                 SWARN(silent, s, "", "You may need to run fsck "
1962                       "or increase size of your LVM partition");
1963                 SWARN(silent, s, "", "Or may be you forgot to "
1964                       "reboot after fdisk when it told you to");
1965                 goto error_unlocked;
1966         }
1967
1968         sbi->s_mount_state = SB_REISERFS_STATE(s);
1969         sbi->s_mount_state = REISERFS_VALID_FS;
1970
1971         if ((errval = reiserfs_init_bitmap_cache(s))) {
1972                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1973                 goto error_unlocked;
1974         }
1975
1976         errval = -EINVAL;
1977 #ifdef CONFIG_REISERFS_CHECK
1978         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1979         SWARN(silent, s, "", "- it is slow mode for debugging.");
1980 #endif
1981
1982         /* make data=ordered the default */
1983         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1984             !reiserfs_data_writeback(s)) {
1985                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1986         }
1987
1988         if (reiserfs_data_log(s)) {
1989                 reiserfs_info(s, "using journaled data mode\n");
1990         } else if (reiserfs_data_ordered(s)) {
1991                 reiserfs_info(s, "using ordered data mode\n");
1992         } else {
1993                 reiserfs_info(s, "using writeback data mode\n");
1994         }
1995         if (reiserfs_barrier_flush(s)) {
1996                 printk("reiserfs: using flush barriers\n");
1997         }
1998
1999         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2000                 SWARN(silent, s, "sh-2022",
2001                       "unable to initialize journal space");
2002                 goto error_unlocked;
2003         } else {
2004                 /*
2005                  * once this is set, journal_release must be called
2006                  * if we error out of the mount
2007                  */
2008                 jinit_done = 1;
2009         }
2010
2011         if (reread_meta_blocks(s)) {
2012                 SWARN(silent, s, "jmacd-9",
2013                       "unable to reread meta blocks after journal init");
2014                 goto error_unlocked;
2015         }
2016
2017         if (replay_only(s))
2018                 goto error_unlocked;
2019
2020         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2021                 SWARN(silent, s, "clm-7000",
2022                       "Detected readonly device, marking FS readonly");
2023                 s->s_flags |= MS_RDONLY;
2024         }
2025         args.objectid = REISERFS_ROOT_OBJECTID;
2026         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2027         root_inode =
2028             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2029                          reiserfs_init_locked_inode, (void *)&args);
2030         if (!root_inode) {
2031                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2032                 goto error_unlocked;
2033         }
2034
2035         /*
2036          * This path assumed to be called with the BKL in the old times.
2037          * Now we have inherited the big reiserfs lock from it and many
2038          * reiserfs helpers called in the mount path and elsewhere require
2039          * this lock to be held even if it's not always necessary. Let's be
2040          * conservative and hold it early. The window can be reduced after
2041          * careful review of the code.
2042          */
2043         reiserfs_write_lock(s);
2044
2045         if (root_inode->i_state & I_NEW) {
2046                 reiserfs_read_locked_inode(root_inode, &args);
2047                 unlock_new_inode(root_inode);
2048         }
2049
2050         s->s_root = d_make_root(root_inode);
2051         if (!s->s_root)
2052                 goto error;
2053         /* define and initialize hash function */
2054         sbi->s_hash_function = hash_function(s);
2055         if (sbi->s_hash_function == NULL) {
2056                 dput(s->s_root);
2057                 s->s_root = NULL;
2058                 goto error;
2059         }
2060
2061         if (is_reiserfs_3_5(rs)
2062             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2063                 set_bit(REISERFS_3_5, &sbi->s_properties);
2064         else if (old_format)
2065                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2066         else
2067                 set_bit(REISERFS_3_6, &sbi->s_properties);
2068
2069         if (!(s->s_flags & MS_RDONLY)) {
2070
2071                 errval = journal_begin(&th, s, 1);
2072                 if (errval) {
2073                         dput(s->s_root);
2074                         s->s_root = NULL;
2075                         goto error;
2076                 }
2077                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2078
2079                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2080                 set_sb_fs_state(rs, 0);
2081
2082                 /*
2083                  * Clear out s_bmap_nr if it would wrap. We can handle this
2084                  * case, but older revisions can't. This will cause the
2085                  * file system to fail mount on those older implementations,
2086                  * avoiding corruption. -jeffm
2087                  */
2088                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2089                     sb_bmap_nr(rs) != 0) {
2090                         reiserfs_warning(s, "super-2030", "This file system "
2091                                         "claims to use %u bitmap blocks in "
2092                                         "its super block, but requires %u. "
2093                                         "Clearing to zero.", sb_bmap_nr(rs),
2094                                         reiserfs_bmap_count(s));
2095
2096                         set_sb_bmap_nr(rs, 0);
2097                 }
2098
2099                 if (old_format_only(s)) {
2100                         /*
2101                          * filesystem of format 3.5 either with standard
2102                          * or non-standard journal
2103                          */
2104                         if (convert_reiserfs(s)) {
2105                                 /* and -o conv is given */
2106                                 if (!silent)
2107                                         reiserfs_info(s,
2108                                                       "converting 3.5 filesystem to the 3.6 format");
2109
2110                                 if (is_reiserfs_3_5(rs))
2111                                         /*
2112                                          * put magic string of 3.6 format.
2113                                          * 2.2 will not be able to
2114                                          * mount this filesystem anymore
2115                                          */
2116                                         memcpy(rs->s_v1.s_magic,
2117                                                reiserfs_3_6_magic_string,
2118                                                sizeof
2119                                                (reiserfs_3_6_magic_string));
2120
2121                                 set_sb_version(rs, REISERFS_VERSION_2);
2122                                 reiserfs_convert_objectid_map_v1(s);
2123                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2124                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2125                         } else if (!silent) {
2126                                 reiserfs_info(s, "using 3.5.x disk format\n");
2127                         }
2128                 } else
2129                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2130
2131
2132                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2133                 errval = journal_end(&th);
2134                 if (errval) {
2135                         dput(s->s_root);
2136                         s->s_root = NULL;
2137                         goto error;
2138                 }
2139
2140                 reiserfs_write_unlock(s);
2141                 if ((errval = reiserfs_lookup_privroot(s)) ||
2142                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2143                         dput(s->s_root);
2144                         s->s_root = NULL;
2145                         goto error_unlocked;
2146                 }
2147                 reiserfs_write_lock(s);
2148
2149                 /*
2150                  * look for files which were to be removed in previous session
2151                  */
2152                 finish_unfinished(s);
2153         } else {
2154                 if (old_format_only(s) && !silent) {
2155                         reiserfs_info(s, "using 3.5.x disk format\n");
2156                 }
2157
2158                 reiserfs_write_unlock(s);
2159                 if ((errval = reiserfs_lookup_privroot(s)) ||
2160                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2161                         dput(s->s_root);
2162                         s->s_root = NULL;
2163                         goto error_unlocked;
2164                 }
2165                 reiserfs_write_lock(s);
2166         }
2167         /*
2168          * mark hash in super block: it could be unset. overwrite should be ok
2169          */
2170         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2171
2172         handle_attrs(s);
2173
2174         reiserfs_proc_info_init(s);
2175
2176         init_waitqueue_head(&(sbi->s_wait));
2177         spin_lock_init(&sbi->bitmap_lock);
2178
2179         reiserfs_write_unlock(s);
2180
2181         return (0);
2182
2183 error:
2184         reiserfs_write_unlock(s);
2185
2186 error_unlocked:
2187         /* kill the commit thread, free journal ram */
2188         if (jinit_done) {
2189                 reiserfs_write_lock(s);
2190                 journal_release_error(NULL, s);
2191                 reiserfs_write_unlock(s);
2192         }
2193
2194         if (sbi->commit_wq)
2195                 destroy_workqueue(sbi->commit_wq);
2196
2197         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2198
2199         reiserfs_free_bitmap_cache(s);
2200         if (SB_BUFFER_WITH_SB(s))
2201                 brelse(SB_BUFFER_WITH_SB(s));
2202 #ifdef CONFIG_QUOTA
2203         {
2204                 int j;
2205                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2206                         kfree(qf_names[j]);
2207         }
2208 #endif
2209         kfree(sbi);
2210
2211         s->s_fs_info = NULL;
2212         return errval;
2213 }
2214
2215 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2216 {
2217         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2218
2219         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2220         buf->f_bfree = sb_free_blocks(rs);
2221         buf->f_bavail = buf->f_bfree;
2222         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2223         buf->f_bsize = dentry->d_sb->s_blocksize;
2224         /* changed to accommodate gcc folks. */
2225         buf->f_type = REISERFS_SUPER_MAGIC;
2226         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2227         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2228                                 sizeof(rs->s_uuid)/2);
2229
2230         return 0;
2231 }
2232
2233 #ifdef CONFIG_QUOTA
2234 static int reiserfs_write_dquot(struct dquot *dquot)
2235 {
2236         struct reiserfs_transaction_handle th;
2237         int ret, err;
2238         int depth;
2239
2240         reiserfs_write_lock(dquot->dq_sb);
2241         ret =
2242             journal_begin(&th, dquot->dq_sb,
2243                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2244         if (ret)
2245                 goto out;
2246         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2247         ret = dquot_commit(dquot);
2248         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2249         err = journal_end(&th);
2250         if (!ret && err)
2251                 ret = err;
2252 out:
2253         reiserfs_write_unlock(dquot->dq_sb);
2254         return ret;
2255 }
2256
2257 static int reiserfs_acquire_dquot(struct dquot *dquot)
2258 {
2259         struct reiserfs_transaction_handle th;
2260         int ret, err;
2261         int depth;
2262
2263         reiserfs_write_lock(dquot->dq_sb);
2264         ret =
2265             journal_begin(&th, dquot->dq_sb,
2266                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2267         if (ret)
2268                 goto out;
2269         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2270         ret = dquot_acquire(dquot);
2271         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2272         err = journal_end(&th);
2273         if (!ret && err)
2274                 ret = err;
2275 out:
2276         reiserfs_write_unlock(dquot->dq_sb);
2277         return ret;
2278 }
2279
2280 static int reiserfs_release_dquot(struct dquot *dquot)
2281 {
2282         struct reiserfs_transaction_handle th;
2283         int ret, err;
2284
2285         reiserfs_write_lock(dquot->dq_sb);
2286         ret =
2287             journal_begin(&th, dquot->dq_sb,
2288                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2289         reiserfs_write_unlock(dquot->dq_sb);
2290         if (ret) {
2291                 /* Release dquot anyway to avoid endless cycle in dqput() */
2292                 dquot_release(dquot);
2293                 goto out;
2294         }
2295         ret = dquot_release(dquot);
2296         reiserfs_write_lock(dquot->dq_sb);
2297         err = journal_end(&th);
2298         if (!ret && err)
2299                 ret = err;
2300         reiserfs_write_unlock(dquot->dq_sb);
2301 out:
2302         return ret;
2303 }
2304
2305 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2306 {
2307         /* Are we journaling quotas? */
2308         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2309             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2310                 dquot_mark_dquot_dirty(dquot);
2311                 return reiserfs_write_dquot(dquot);
2312         } else
2313                 return dquot_mark_dquot_dirty(dquot);
2314 }
2315
2316 static int reiserfs_write_info(struct super_block *sb, int type)
2317 {
2318         struct reiserfs_transaction_handle th;
2319         int ret, err;
2320         int depth;
2321
2322         /* Data block + inode block */
2323         reiserfs_write_lock(sb);
2324         ret = journal_begin(&th, sb, 2);
2325         if (ret)
2326                 goto out;
2327         depth = reiserfs_write_unlock_nested(sb);
2328         ret = dquot_commit_info(sb, type);
2329         reiserfs_write_lock_nested(sb, depth);
2330         err = journal_end(&th);
2331         if (!ret && err)
2332                 ret = err;
2333 out:
2334         reiserfs_write_unlock(sb);
2335         return ret;
2336 }
2337
2338 /*
2339  * Turn on quotas during mount time - we need to find the quota file and such...
2340  */
2341 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2342 {
2343         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2344                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2345 }
2346
2347 /*
2348  * Standard function to be called on quota_on
2349  */
2350 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2351                              struct path *path)
2352 {
2353         int err;
2354         struct inode *inode;
2355         struct reiserfs_transaction_handle th;
2356         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2357
2358         reiserfs_write_lock(sb);
2359         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2360                 err = -EINVAL;
2361                 goto out;
2362         }
2363
2364         /* Quotafile not on the same filesystem? */
2365         if (path->dentry->d_sb != sb) {
2366                 err = -EXDEV;
2367                 goto out;
2368         }
2369         inode = d_inode(path->dentry);
2370         /*
2371          * We must not pack tails for quota files on reiserfs for quota
2372          * IO to work
2373          */
2374         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2375                 err = reiserfs_unpack(inode, NULL);
2376                 if (err) {
2377                         reiserfs_warning(sb, "super-6520",
2378                                 "Unpacking tail of quota file failed"
2379                                 " (%d). Cannot turn on quotas.", err);
2380                         err = -EINVAL;
2381                         goto out;
2382                 }
2383                 mark_inode_dirty(inode);
2384         }
2385         /* Journaling quota? */
2386         if (REISERFS_SB(sb)->s_qf_names[type]) {
2387                 /* Quotafile not of fs root? */
2388                 if (path->dentry->d_parent != sb->s_root)
2389                         reiserfs_warning(sb, "super-6521",
2390                                  "Quota file not on filesystem root. "
2391                                  "Journalled quota will not work.");
2392         }
2393
2394         /*
2395          * When we journal data on quota file, we have to flush journal to see
2396          * all updates to the file when we bypass pagecache...
2397          */
2398         if (reiserfs_file_data_log(inode)) {
2399                 /* Just start temporary transaction and finish it */
2400                 err = journal_begin(&th, sb, 1);
2401                 if (err)
2402                         goto out;
2403                 err = journal_end_sync(&th);
2404                 if (err)
2405                         goto out;
2406         }
2407         reiserfs_write_unlock(sb);
2408         return dquot_quota_on(sb, type, format_id, path);
2409 out:
2410         reiserfs_write_unlock(sb);
2411         return err;
2412 }
2413
2414 /*
2415  * Read data from quotafile - avoid pagecache and such because we cannot afford
2416  * acquiring the locks... As quota files are never truncated and quota code
2417  * itself serializes the operations (and no one else should touch the files)
2418  * we don't have to be afraid of races
2419  */
2420 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2421                                    size_t len, loff_t off)
2422 {
2423         struct inode *inode = sb_dqopt(sb)->files[type];
2424         unsigned long blk = off >> sb->s_blocksize_bits;
2425         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2426         size_t toread;
2427         struct buffer_head tmp_bh, *bh;
2428         loff_t i_size = i_size_read(inode);
2429
2430         if (off > i_size)
2431                 return 0;
2432         if (off + len > i_size)
2433                 len = i_size - off;
2434         toread = len;
2435         while (toread > 0) {
2436                 tocopy =
2437                     sb->s_blocksize - offset <
2438                     toread ? sb->s_blocksize - offset : toread;
2439                 tmp_bh.b_state = 0;
2440                 /*
2441                  * Quota files are without tails so we can safely
2442                  * use this function
2443                  */
2444                 reiserfs_write_lock(sb);
2445                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2446                 reiserfs_write_unlock(sb);
2447                 if (err)
2448                         return err;
2449                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2450                         memset(data, 0, tocopy);
2451                 else {
2452                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2453                         if (!bh)
2454                                 return -EIO;
2455                         memcpy(data, bh->b_data + offset, tocopy);
2456                         brelse(bh);
2457                 }
2458                 offset = 0;
2459                 toread -= tocopy;
2460                 data += tocopy;
2461                 blk++;
2462         }
2463         return len;
2464 }
2465
2466 /*
2467  * Write to quotafile (we know the transaction is already started and has
2468  * enough credits)
2469  */
2470 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2471                                     const char *data, size_t len, loff_t off)
2472 {
2473         struct inode *inode = sb_dqopt(sb)->files[type];
2474         unsigned long blk = off >> sb->s_blocksize_bits;
2475         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2476         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2477         size_t towrite = len;
2478         struct buffer_head tmp_bh, *bh;
2479
2480         if (!current->journal_info) {
2481                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2482                         (unsigned long long)off, (unsigned long long)len);
2483                 return -EIO;
2484         }
2485         while (towrite > 0) {
2486                 tocopy = sb->s_blocksize - offset < towrite ?
2487                     sb->s_blocksize - offset : towrite;
2488                 tmp_bh.b_state = 0;
2489                 reiserfs_write_lock(sb);
2490                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2491                 reiserfs_write_unlock(sb);
2492                 if (err)
2493                         goto out;
2494                 if (offset || tocopy != sb->s_blocksize)
2495                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2496                 else
2497                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2498                 if (!bh) {
2499                         err = -EIO;
2500                         goto out;
2501                 }
2502                 lock_buffer(bh);
2503                 memcpy(bh->b_data + offset, data, tocopy);
2504                 flush_dcache_page(bh->b_page);
2505                 set_buffer_uptodate(bh);
2506                 unlock_buffer(bh);
2507                 reiserfs_write_lock(sb);
2508                 reiserfs_prepare_for_journal(sb, bh, 1);
2509                 journal_mark_dirty(current->journal_info, bh);
2510                 if (!journal_quota)
2511                         reiserfs_add_ordered_list(inode, bh);
2512                 reiserfs_write_unlock(sb);
2513                 brelse(bh);
2514                 offset = 0;
2515                 towrite -= tocopy;
2516                 data += tocopy;
2517                 blk++;
2518         }
2519 out:
2520         if (len == towrite)
2521                 return err;
2522         if (inode->i_size < off + len - towrite)
2523                 i_size_write(inode, off + len - towrite);
2524         inode->i_version++;
2525         inode->i_mtime = inode->i_ctime = current_time(inode);
2526         mark_inode_dirty(inode);
2527         return len - towrite;
2528 }
2529
2530 #endif
2531
2532 static struct dentry *get_super_block(struct file_system_type *fs_type,
2533                            int flags, const char *dev_name,
2534                            void *data)
2535 {
2536         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2537 }
2538
2539 static int __init init_reiserfs_fs(void)
2540 {
2541         int ret;
2542
2543         ret = init_inodecache();
2544         if (ret)
2545                 return ret;
2546
2547         reiserfs_proc_info_global_init();
2548
2549         ret = register_filesystem(&reiserfs_fs_type);
2550         if (ret)
2551                 goto out;
2552
2553         return 0;
2554 out:
2555         reiserfs_proc_info_global_done();
2556         destroy_inodecache();
2557
2558         return ret;
2559 }
2560
2561 static void __exit exit_reiserfs_fs(void)
2562 {
2563         reiserfs_proc_info_global_done();
2564         unregister_filesystem(&reiserfs_fs_type);
2565         destroy_inodecache();
2566 }
2567
2568 struct file_system_type reiserfs_fs_type = {
2569         .owner = THIS_MODULE,
2570         .name = "reiserfs",
2571         .mount = get_super_block,
2572         .kill_sb = reiserfs_kill_sb,
2573         .fs_flags = FS_REQUIRES_DEV,
2574 };
2575 MODULE_ALIAS_FS("reiserfs");
2576
2577 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2578 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2579 MODULE_LICENSE("GPL");
2580
2581 module_init(init_reiserfs_fs);
2582 module_exit(exit_reiserfs_fs);