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