Pileus Git - ~andy/linux/blob - fs/reiserfs/super.c

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