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