kernel/fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <linux/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/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
  66 static int reiserfs_sync_fs(struct super_block *s, int wait)
  67 {
  68         struct reiserfs_transaction_handle th;
  69
  70         /*
  71          * Writeback quota in non-journalled quota case - journalled quota has
  72          * no dirty dquots
  73          */
  74         dquot_writeback_dquots(s, -1);
  75         reiserfs_write_lock(s);
  76         if (!journal_begin(&th, s, 1))
  77                 if (!journal_end_sync(&th))
  78                         reiserfs_flush_old_commits(s);
  79         reiserfs_write_unlock(s);
  80         return 0;
  81 }
  82
  83 static void flush_old_commits(struct work_struct *work)
  84 {
  85         struct reiserfs_sb_info *sbi;
  86         struct super_block *s;
  87
  88         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  89         s = sbi->s_journal->j_work_sb;
  90
  91         spin_lock(&sbi->old_work_lock);
  92         sbi->work_queued = 0;
  93         spin_unlock(&sbi->old_work_lock);
  94
  95         reiserfs_sync_fs(s, 1);
  96 }
  97
  98 void reiserfs_schedule_old_flush(struct super_block *s)
  99 {
 100         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 101         unsigned long delay;
 102
 103         /*
 104          * Avoid scheduling flush when sb is being shut down. It can race
 105          * with journal shutdown and free still queued delayed work.
 106          */
 107         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 108                 return;
 109
 110         spin_lock(&sbi->old_work_lock);
 111         if (!sbi->work_queued) {
 112                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 113                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 114                 sbi->work_queued = 1;
 115         }
 116         spin_unlock(&sbi->old_work_lock);
 117 }
 118
 119 static void cancel_old_flush(struct super_block *s)
 120 {
 121         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 122
 123         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 124         spin_lock(&sbi->old_work_lock);
 125         sbi->work_queued = 0;
 126         spin_unlock(&sbi->old_work_lock);
 127 }
 128
 129 static int reiserfs_freeze(struct super_block *s)
 130 {
 131         struct reiserfs_transaction_handle th;
 132
 133         cancel_old_flush(s);
 134
 135         reiserfs_write_lock(s);
 136         if (!(s->s_flags & MS_RDONLY)) {
 137                 int err = journal_begin(&th, s, 1);
 138                 if (err) {
 139                         reiserfs_block_writes(&th);
 140                 } else {
 141                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 142                                                      1);
 143                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 144                         reiserfs_block_writes(&th);
 145                         journal_end_sync(&th);
 146                 }
 147         }
 148         reiserfs_write_unlock(s);
 149         return 0;
 150 }
 151
 152 static int reiserfs_unfreeze(struct super_block *s)
 153 {
 154         reiserfs_allow_writes(s);
 155         return 0;
 156 }
 157
 158 extern const struct in_core_key MAX_IN_CORE_KEY;
 159
 160 /*
 161  * this is used to delete "save link" when there are no items of a
 162  * file it points to. It can either happen if unlink is completed but
 163  * "save unlink" removal, or if file has both unlink and truncate
 164  * pending and as unlink completes first (because key of "save link"
 165  * protecting unlink is bigger that a key lf "save link" which
 166  * protects truncate), so there left no items to make truncate
 167  * completion on
 168  */
 169 static int remove_save_link_only(struct super_block *s,
 170                                  struct reiserfs_key *key, int oid_free)
 171 {
 172         struct reiserfs_transaction_handle th;
 173         int err;
 174
 175         /* we are going to do one balancing */
 176         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 177         if (err)
 178                 return err;
 179
 180         reiserfs_delete_solid_item(&th, NULL, key);
 181         if (oid_free)
 182                 /* removals are protected by direct items */
 183                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 184
 185         return journal_end(&th);
 186 }
 187
 188 #ifdef CONFIG_QUOTA
 189 static int reiserfs_quota_on_mount(struct super_block *, int);
 190 #endif
 191
 192 /* look for uncompleted unlinks and truncates and complete them */
 193 static int finish_unfinished(struct super_block *s)
 194 {
 195         INITIALIZE_PATH(path);
 196         struct cpu_key max_cpu_key, obj_key;
 197         struct reiserfs_key save_link_key, last_inode_key;
 198         int retval = 0;
 199         struct item_head *ih;
 200         struct buffer_head *bh;
 201         int item_pos;
 202         char *item;
 203         int done;
 204         struct inode *inode;
 205         int truncate;
 206 #ifdef CONFIG_QUOTA
 207         int i;
 208         int ms_active_set;
 209         int quota_enabled[REISERFS_MAXQUOTAS];
 210 #endif
 211
 212         /* compose key to look for "save" links */
 213         max_cpu_key.version = KEY_FORMAT_3_5;
 214         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 215         max_cpu_key.on_disk_key.k_objectid = ~0U;
 216         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 217         max_cpu_key.key_length = 3;
 218
 219         memset(&last_inode_key, 0, sizeof(last_inode_key));
 220
 221 #ifdef CONFIG_QUOTA
 222         /* Needed for iput() to work correctly and not trash data */
 223         if (s->s_flags & MS_ACTIVE) {
 224                 ms_active_set = 0;
 225         } else {
 226                 ms_active_set = 1;
 227                 s->s_flags |= MS_ACTIVE;
 228         }
 229         /* Turn on quotas so that they are updated correctly */
 230         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 231                 quota_enabled[i] = 1;
 232                 if (REISERFS_SB(s)->s_qf_names[i]) {
 233                         int ret;
 234
 235                         if (sb_has_quota_active(s, i)) {
 236                                 quota_enabled[i] = 0;
 237                                 continue;
 238                         }
 239                         ret = reiserfs_quota_on_mount(s, i);
 240                         if (ret < 0)
 241                                 reiserfs_warning(s, "reiserfs-2500",
 242                                                  "cannot turn on journaled "
 243                                                  "quota: error %d", ret);
 244                 }
 245         }
 246 #endif
 247
 248         done = 0;
 249         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 250         while (!retval) {
 251                 int depth;
 252                 retval = search_item(s, &max_cpu_key, &path);
 253                 if (retval != ITEM_NOT_FOUND) {
 254                         reiserfs_error(s, "vs-2140",
 255                                        "search_by_key returned %d", retval);
 256                         break;
 257                 }
 258
 259                 bh = get_last_bh(&path);
 260                 item_pos = get_item_pos(&path);
 261                 if (item_pos != B_NR_ITEMS(bh)) {
 262                         reiserfs_warning(s, "vs-2060",
 263                                          "wrong position found");
 264                         break;
 265                 }
 266                 item_pos--;
 267                 ih = item_head(bh, item_pos);
 268
 269                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 270                         /* there are no "save" links anymore */
 271                         break;
 272
 273                 save_link_key = ih->ih_key;
 274                 if (is_indirect_le_ih(ih))
 275                         truncate = 1;
 276                 else
 277                         truncate = 0;
 278
 279                 /* reiserfs_iget needs k_dirid and k_objectid only */
 280                 item = ih_item_body(bh, ih);
 281                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 282                 obj_key.on_disk_key.k_objectid =
 283                     le32_to_cpu(ih->ih_key.k_objectid);
 284                 obj_key.on_disk_key.k_offset = 0;
 285                 obj_key.on_disk_key.k_type = 0;
 286
 287                 pathrelse(&path);
 288
 289                 inode = reiserfs_iget(s, &obj_key);
 290                 if (!inode) {
 291                         /*
 292                          * the unlink almost completed, it just did not
 293                          * manage to remove "save" link and release objectid
 294                          */
 295                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 296                                          &obj_key);
 297                         retval = remove_save_link_only(s, &save_link_key, 1);
 298                         continue;
 299                 }
 300
 301                 if (!truncate && inode->i_nlink) {
 302                         /* file is not unlinked */
 303                         reiserfs_warning(s, "vs-2185",
 304                                          "file %K is not unlinked",
 305                                          &obj_key);
 306                         retval = remove_save_link_only(s, &save_link_key, 0);
 307                         continue;
 308                 }
 309                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 310                 dquot_initialize(inode);
 311                 reiserfs_write_lock_nested(inode->i_sb, depth);
 312
 313                 if (truncate && S_ISDIR(inode->i_mode)) {
 314                         /*
 315                          * We got a truncate request for a dir which
 316                          * is impossible.  The only imaginable way is to
 317                          * execute unfinished truncate request then boot
 318                          * into old kernel, remove the file and create dir
 319                          * with the same key.
 320                          */
 321                         reiserfs_warning(s, "green-2101",
 322                                          "impossible truncate on a "
 323                                          "directory %k. Please report",
 324                                          INODE_PKEY(inode));
 325                         retval = remove_save_link_only(s, &save_link_key, 0);
 326                         truncate = 0;
 327                         iput(inode);
 328                         continue;
 329                 }
 330
 331                 if (truncate) {
 332                         REISERFS_I(inode)->i_flags |=
 333                             i_link_saved_truncate_mask;
 334                         /*
 335                          * not completed truncate found. New size was
 336                          * committed together with "save" link
 337                          */
 338                         reiserfs_info(s, "Truncating %k to %lld ..",
 339                                       INODE_PKEY(inode), inode->i_size);
 340
 341                         /* don't update modification time */
 342                         reiserfs_truncate_file(inode, 0);
 343
 344                         retval = remove_save_link(inode, truncate);
 345                 } else {
 346                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 347                         /* not completed unlink (rmdir) found */
 348                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 349                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 350                                         sizeof(last_inode_key))){
 351                                 last_inode_key = *INODE_PKEY(inode);
 352                                 /* removal gets completed in iput */
 353                                 retval = 0;
 354                         } else {
 355                                 reiserfs_warning(s, "super-2189", "Dead loop "
 356                                                  "in finish_unfinished "
 357                                                  "detected, just remove "
 358                                                  "save link\n");
 359                                 retval = remove_save_link_only(s,
 360                                                         &save_link_key, 0);
 361                         }
 362                 }
 363
 364                 iput(inode);
 365                 printk("done\n");
 366                 done++;
 367         }
 368         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 369
 370 #ifdef CONFIG_QUOTA
 371         /* Turn quotas off */
 372         reiserfs_write_unlock(s);
 373         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 374                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 375                         dquot_quota_off(s, i);
 376         }
 377         reiserfs_write_lock(s);
 378         if (ms_active_set)
 379                 /* Restore the flag back */
 380                 s->s_flags &= ~MS_ACTIVE;
 381 #endif
 382         pathrelse(&path);
 383         if (done)
 384                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 385                               "Completed\n", done);
 386         return retval;
 387 }
 388
 389 /*
 390  * to protect file being unlinked from getting lost we "safe" link files
 391  * being unlinked. This link will be deleted in the same transaction with last
 392  * item of file. mounting the filesystem we scan all these links and remove
 393  * files which almost got lost
 394  */
 395 void add_save_link(struct reiserfs_transaction_handle *th,
 396                    struct inode *inode, int truncate)
 397 {
 398         INITIALIZE_PATH(path);
 399         int retval;
 400         struct cpu_key key;
 401         struct item_head ih;
 402         __le32 link;
 403
 404         BUG_ON(!th->t_trans_id);
 405
 406         /* file can only get one "save link" of each kind */
 407         RFALSE(truncate &&
 408                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 409                "saved link already exists for truncated inode %lx",
 410                (long)inode->i_ino);
 411         RFALSE(!truncate &&
 412                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 413                "saved link already exists for unlinked inode %lx",
 414                (long)inode->i_ino);
 415
 416         /* setup key of "save" link */
 417         key.version = KEY_FORMAT_3_5;
 418         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 419         key.on_disk_key.k_objectid = inode->i_ino;
 420         if (!truncate) {
 421                 /* unlink, rmdir, rename */
 422                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 423                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 424
 425                 /* item head of "safe" link */
 426                 make_le_item_head(&ih, &key, key.version,
 427                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 428                                   4 /*length */ , 0xffff /*free space */ );
 429         } else {
 430                 /* truncate */
 431                 if (S_ISDIR(inode->i_mode))
 432                         reiserfs_warning(inode->i_sb, "green-2102",
 433                                          "Adding a truncate savelink for "
 434                                          "a directory %k! Please report",
 435                                          INODE_PKEY(inode));
 436                 set_cpu_key_k_offset(&key, 1);
 437                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 438
 439                 /* item head of "safe" link */
 440                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 441                                   4 /*length */ , 0 /*free space */ );
 442         }
 443         key.key_length = 3;
 444
 445         /* look for its place in the tree */
 446         retval = search_item(inode->i_sb, &key, &path);
 447         if (retval != ITEM_NOT_FOUND) {
 448                 if (retval != -ENOSPC)
 449                         reiserfs_error(inode->i_sb, "vs-2100",
 450                                        "search_by_key (%K) returned %d", &key,
 451                                        retval);
 452                 pathrelse(&path);
 453                 return;
 454         }
 455
 456         /* body of "save" link */
 457         link = INODE_PKEY(inode)->k_dir_id;
 458
 459         /* put "save" link into tree, don't charge quota to anyone */
 460         retval =
 461             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 462         if (retval) {
 463                 if (retval != -ENOSPC)
 464                         reiserfs_error(inode->i_sb, "vs-2120",
 465                                        "insert_item returned %d", retval);
 466         } else {
 467                 if (truncate)
 468                         REISERFS_I(inode)->i_flags |=
 469                             i_link_saved_truncate_mask;
 470                 else
 471                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 472         }
 473 }
 474
 475 /* this opens transaction unlike add_save_link */
 476 int remove_save_link(struct inode *inode, int truncate)
 477 {
 478         struct reiserfs_transaction_handle th;
 479         struct reiserfs_key key;
 480         int err;
 481
 482         /* we are going to do one balancing only */
 483         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 484         if (err)
 485                 return err;
 486
 487         /* setup key of "save" link */
 488         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 489         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 490         if (!truncate) {
 491                 /* unlink, rmdir, rename */
 492                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 493                                     1 + inode->i_sb->s_blocksize);
 494                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 495         } else {
 496                 /* truncate */
 497                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 498                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 499         }
 500
 501         if ((truncate &&
 502              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 503             (!truncate &&
 504              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 505                 /* don't take quota bytes from anywhere */
 506                 reiserfs_delete_solid_item(&th, NULL, &key);
 507         if (!truncate) {
 508                 reiserfs_release_objectid(&th, inode->i_ino);
 509                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 510         } else
 511                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 512
 513         return journal_end(&th);
 514 }
 515
 516 static void reiserfs_kill_sb(struct super_block *s)
 517 {
 518         if (REISERFS_SB(s)) {
 519                 reiserfs_proc_info_done(s);
 520                 /*
 521                  * Force any pending inode evictions to occur now. Any
 522                  * inodes to be removed that have extended attributes
 523                  * associated with them need to clean them up before
 524                  * we can release the extended attribute root dentries.
 525                  * shrink_dcache_for_umount will BUG if we don't release
 526                  * those before it's called so ->put_super is too late.
 527                  */
 528                 shrink_dcache_sb(s);
 529
 530                 dput(REISERFS_SB(s)->xattr_root);
 531                 REISERFS_SB(s)->xattr_root = NULL;
 532                 dput(REISERFS_SB(s)->priv_root);
 533                 REISERFS_SB(s)->priv_root = NULL;
 534         }
 535
 536         kill_block_super(s);
 537 }
 538
 539 static void reiserfs_put_super(struct super_block *s)
 540 {
 541         struct reiserfs_transaction_handle th;
 542         th.t_trans_id = 0;
 543
 544         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 545
 546         reiserfs_write_lock(s);
 547
 548         /*
 549          * change file system state to current state if it was mounted
 550          * with read-write permissions
 551          */
 552         if (!(s->s_flags & MS_RDONLY)) {
 553                 if (!journal_begin(&th, s, 10)) {
 554                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 555                                                      1);
 556                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 557                                             REISERFS_SB(s)->s_mount_state);
 558                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 559                 }
 560         }
 561
 562         /*
 563          * note, journal_release checks for readonly mount, and can
 564          * decide not to do a journal_end
 565          */
 566         journal_release(&th, s);
 567
 568         reiserfs_free_bitmap_cache(s);
 569
 570         brelse(SB_BUFFER_WITH_SB(s));
 571
 572         print_statistics(s);
 573
 574         if (REISERFS_SB(s)->reserved_blocks != 0) {
 575                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 576                                  REISERFS_SB(s)->reserved_blocks);
 577         }
 578
 579         reiserfs_write_unlock(s);
 580         mutex_destroy(&REISERFS_SB(s)->lock);
 581         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 582         kfree(s->s_fs_info);
 583         s->s_fs_info = NULL;
 584 }
 585
 586 static struct kmem_cache *reiserfs_inode_cachep;
 587
 588 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 589 {
 590         struct reiserfs_inode_info *ei;
 591         ei = (struct reiserfs_inode_info *)
 592             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 593         if (!ei)
 594                 return NULL;
 595         atomic_set(&ei->openers, 0);
 596         mutex_init(&ei->tailpack);
 597 #ifdef CONFIG_QUOTA
 598         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 599 #endif
 600
 601         return &ei->vfs_inode;
 602 }
 603
 604 static void reiserfs_i_callback(struct rcu_head *head)
 605 {
 606         struct inode *inode = container_of(head, struct inode, i_rcu);
 607         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 608 }
 609
 610 static void reiserfs_destroy_inode(struct inode *inode)
 611 {
 612         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 613 }
 614
 615 static void init_once(void *foo)
 616 {
 617         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 618
 619         INIT_LIST_HEAD(&ei->i_prealloc_list);
 620         inode_init_once(&ei->vfs_inode);
 621 }
 622
 623 static int __init init_inodecache(void)
 624 {
 625         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 626                                                   sizeof(struct
 627                                                          reiserfs_inode_info),
 628                                                   0, (SLAB_RECLAIM_ACCOUNT|
 629                                                         SLAB_MEM_SPREAD),
 630                                                   init_once);
 631         if (reiserfs_inode_cachep == NULL)
 632                 return -ENOMEM;
 633         return 0;
 634 }
 635
 636 static void destroy_inodecache(void)
 637 {
 638         /*
 639          * Make sure all delayed rcu free inodes are flushed before we
 640          * destroy cache.
 641          */
 642         rcu_barrier();
 643         kmem_cache_destroy(reiserfs_inode_cachep);
 644 }
 645
 646 /* we don't mark inodes dirty, we just log them */
 647 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 648 {
 649         struct reiserfs_transaction_handle th;
 650
 651         int err = 0;
 652
 653         if (inode->i_sb->s_flags & MS_RDONLY) {
 654                 reiserfs_warning(inode->i_sb, "clm-6006",
 655                                  "writing inode %lu on readonly FS",
 656                                  inode->i_ino);
 657                 return;
 658         }
 659         reiserfs_write_lock(inode->i_sb);
 660
 661         /*
 662          * this is really only used for atime updates, so they don't have
 663          * to be included in O_SYNC or fsync
 664          */
 665         err = journal_begin(&th, inode->i_sb, 1);
 666         if (err)
 667                 goto out;
 668
 669         reiserfs_update_sd(&th, inode);
 670         journal_end(&th);
 671
 672 out:
 673         reiserfs_write_unlock(inode->i_sb);
 674 }
 675
 676 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 677 {
 678         struct super_block *s = root->d_sb;
 679         struct reiserfs_journal *journal = SB_JOURNAL(s);
 680         long opts = REISERFS_SB(s)->s_mount_opt;
 681
 682         if (opts & (1 << REISERFS_LARGETAIL))
 683                 seq_puts(seq, ",tails=on");
 684         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 685                 seq_puts(seq, ",notail");
 686         /* tails=small is default so we don't show it */
 687
 688         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 689                 seq_puts(seq, ",barrier=none");
 690         /* barrier=flush is default so we don't show it */
 691
 692         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 693                 seq_puts(seq, ",errors=continue");
 694         else if (opts & (1 << REISERFS_ERROR_PANIC))
 695                 seq_puts(seq, ",errors=panic");
 696         /* errors=ro is default so we don't show it */
 697
 698         if (opts & (1 << REISERFS_DATA_LOG))
 699                 seq_puts(seq, ",data=journal");
 700         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 701                 seq_puts(seq, ",data=writeback");
 702         /* data=ordered is default so we don't show it */
 703
 704         if (opts & (1 << REISERFS_ATTRS))
 705                 seq_puts(seq, ",attrs");
 706
 707         if (opts & (1 << REISERFS_XATTRS_USER))
 708                 seq_puts(seq, ",user_xattr");
 709
 710         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 711                 seq_puts(seq, ",expose_privroot");
 712
 713         if (opts & (1 << REISERFS_POSIXACL))
 714                 seq_puts(seq, ",acl");
 715
 716         if (REISERFS_SB(s)->s_jdev)
 717                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 718
 719         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 720                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 721
 722 #ifdef CONFIG_QUOTA
 723         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 724                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 725         else if (opts & (1 << REISERFS_USRQUOTA))
 726                 seq_puts(seq, ",usrquota");
 727         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 728                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 729         else if (opts & (1 << REISERFS_GRPQUOTA))
 730                 seq_puts(seq, ",grpquota");
 731         if (REISERFS_SB(s)->s_jquota_fmt) {
 732                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 733                         seq_puts(seq, ",jqfmt=vfsold");
 734                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 735                         seq_puts(seq, ",jqfmt=vfsv0");
 736         }
 737 #endif
 738
 739         /* Block allocator options */
 740         if (opts & (1 << REISERFS_NO_BORDER))
 741                 seq_puts(seq, ",block-allocator=noborder");
 742         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 743                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 744         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 745                 seq_puts(seq, ",block-allocator=hashed_relocation");
 746         if (opts & (1 << REISERFS_TEST4))
 747                 seq_puts(seq, ",block-allocator=test4");
 748         show_alloc_options(seq, s);
 749         return 0;
 750 }
 751
 752 #ifdef CONFIG_QUOTA
 753 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 754                                     size_t, loff_t);
 755 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 756                                    loff_t);
 757
 758 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 759 {
 760         return REISERFS_I(inode)->i_dquot;
 761 }
 762 #endif
 763
 764 static const struct super_operations reiserfs_sops = {
 765         .alloc_inode = reiserfs_alloc_inode,
 766         .destroy_inode = reiserfs_destroy_inode,
 767         .write_inode = reiserfs_write_inode,
 768         .dirty_inode = reiserfs_dirty_inode,
 769         .evict_inode = reiserfs_evict_inode,
 770         .put_super = reiserfs_put_super,
 771         .sync_fs = reiserfs_sync_fs,
 772         .freeze_fs = reiserfs_freeze,
 773         .unfreeze_fs = reiserfs_unfreeze,
 774         .statfs = reiserfs_statfs,
 775         .remount_fs = reiserfs_remount,
 776         .show_options = reiserfs_show_options,
 777 #ifdef CONFIG_QUOTA
 778         .quota_read = reiserfs_quota_read,
 779         .quota_write = reiserfs_quota_write,
 780         .get_dquots = reiserfs_get_dquots,
 781 #endif
 782 };
 783
 784 #ifdef CONFIG_QUOTA
 785 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 786
 787 static int reiserfs_write_dquot(struct dquot *);
 788 static int reiserfs_acquire_dquot(struct dquot *);
 789 static int reiserfs_release_dquot(struct dquot *);
 790 static int reiserfs_mark_dquot_dirty(struct dquot *);
 791 static int reiserfs_write_info(struct super_block *, int);
 792 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 793
 794 static const struct dquot_operations reiserfs_quota_operations = {
 795         .write_dquot = reiserfs_write_dquot,
 796         .acquire_dquot = reiserfs_acquire_dquot,
 797         .release_dquot = reiserfs_release_dquot,
 798         .mark_dirty = reiserfs_mark_dquot_dirty,
 799         .write_info = reiserfs_write_info,
 800         .alloc_dquot    = dquot_alloc,
 801         .destroy_dquot  = dquot_destroy,
 802 };
 803
 804 static const struct quotactl_ops reiserfs_qctl_operations = {
 805         .quota_on = reiserfs_quota_on,
 806         .quota_off = dquot_quota_off,
 807         .quota_sync = dquot_quota_sync,
 808         .get_state = dquot_get_state,
 809         .set_info = dquot_set_dqinfo,
 810         .get_dqblk = dquot_get_dqblk,
 811         .set_dqblk = dquot_set_dqblk,
 812 };
 813 #endif
 814
 815 static const struct export_operations reiserfs_export_ops = {
 816         .encode_fh = reiserfs_encode_fh,
 817         .fh_to_dentry = reiserfs_fh_to_dentry,
 818         .fh_to_parent = reiserfs_fh_to_parent,
 819         .get_parent = reiserfs_get_parent,
 820 };
 821
 822 /*
 823  * this struct is used in reiserfs_getopt () for containing the value for
 824  * those mount options that have values rather than being toggles.
 825  */
 826 typedef struct {
 827         char *value;
 828         /*
 829          * bitmask which is to set on mount_options bitmask
 830          * when this value is found, 0 is no bits are to be changed.
 831          */
 832         int setmask;
 833         /*
 834          * bitmask which is to clear on mount_options bitmask
 835          * when this value is found, 0 is no bits are to be changed.
 836          * This is applied BEFORE setmask
 837          */
 838         int clrmask;
 839 } arg_desc_t;
 840
 841 /* Set this bit in arg_required to allow empty arguments */
 842 #define REISERFS_OPT_ALLOWEMPTY 31
 843
 844 /*
 845  * this struct is used in reiserfs_getopt() for describing the
 846  * set of reiserfs mount options
 847  */
 848 typedef struct {
 849         char *option_name;
 850
 851         /* 0 if argument is not required, not 0 otherwise */
 852         int arg_required;
 853
 854         /* list of values accepted by an option */
 855         const arg_desc_t *values;
 856
 857         /*
 858          * bitmask which is to set on mount_options bitmask
 859          * when this value is found, 0 is no bits are to be changed.
 860          */
 861         int setmask;
 862
 863         /*
 864          * bitmask which is to clear on mount_options bitmask
 865          * when this value is found, 0 is no bits are to be changed.
 866          * This is applied BEFORE setmask
 867          */
 868         int clrmask;
 869 } opt_desc_t;
 870
 871 /* possible values for -o data= */
 872 static const arg_desc_t logging_mode[] = {
 873         {"ordered", 1 << REISERFS_DATA_ORDERED,
 874          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 875         {"journal", 1 << REISERFS_DATA_LOG,
 876          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 877         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 878          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 879         {.value = NULL}
 880 };
 881
 882 /* possible values for -o barrier= */
 883 static const arg_desc_t barrier_mode[] = {
 884         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 885         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 886         {.value = NULL}
 887 };
 888
 889 /*
 890  * possible values for "-o block-allocator=" and bits which are to be set in
 891  * s_mount_opt of reiserfs specific part of in-core super block
 892  */
 893 static const arg_desc_t balloc[] = {
 894         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 895         {"border", 0, 1 << REISERFS_NO_BORDER},
 896         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 897         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 898         {"test4", 1 << REISERFS_TEST4, 0},
 899         {"notest4", 0, 1 << REISERFS_TEST4},
 900         {NULL, 0, 0}
 901 };
 902
 903 static const arg_desc_t tails[] = {
 904         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 905         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 906         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 907         {NULL, 0, 0}
 908 };
 909
 910 static const arg_desc_t error_actions[] = {
 911         {"panic", 1 << REISERFS_ERROR_PANIC,
 912          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 913         {"ro-remount", 1 << REISERFS_ERROR_RO,
 914          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 915 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 916         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 917          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 918 #endif
 919         {NULL, 0, 0},
 920 };
 921
 922 /*
 923  * proceed only one option from a list *cur - string containing of mount
 924  * options
 925  * opts - array of options which are accepted
 926  * opt_arg - if option is found and requires an argument and if it is specifed
 927  * in the input - pointer to the argument is stored here
 928  * bit_flags - if option requires to set a certain bit - it is set here
 929  * return -1 if unknown option is found, opt->arg_required otherwise
 930  */
 931 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 932                            char **opt_arg, unsigned long *bit_flags)
 933 {
 934         char *p;
 935         /*
 936          * foo=bar,
 937          * ^   ^  ^
 938          * |   |  +-- option_end
 939          * |   +-- arg_start
 940          * +-- option_start
 941          */
 942         const opt_desc_t *opt;
 943         const arg_desc_t *arg;
 944
 945         p = *cur;
 946
 947         /* assume argument cannot contain commas */
 948         *cur = strchr(p, ',');
 949         if (*cur) {
 950                 *(*cur) = '\0';
 951                 (*cur)++;
 952         }
 953
 954         if (!strncmp(p, "alloc=", 6)) {
 955                 /*
 956                  * Ugly special case, probably we should redo options
 957                  * parser so that it can understand several arguments for
 958                  * some options, also so that it can fill several bitfields
 959                  * with option values.
 960                  */
 961                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 962                         return -1;
 963                 } else {
 964                         return 0;
 965                 }
 966         }
 967
 968         /* for every option in the list */
 969         for (opt = opts; opt->option_name; opt++) {
 970                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 971                         if (bit_flags) {
 972                                 if (opt->clrmask ==
 973                                     (1 << REISERFS_UNSUPPORTED_OPT))
 974                                         reiserfs_warning(s, "super-6500",
 975                                                          "%s not supported.\n",
 976                                                          p);
 977                                 else
 978                                         *bit_flags &= ~opt->clrmask;
 979                                 if (opt->setmask ==
 980                                     (1 << REISERFS_UNSUPPORTED_OPT))
 981                                         reiserfs_warning(s, "super-6501",
 982                                                          "%s not supported.\n",
 983                                                          p);
 984                                 else
 985                                         *bit_flags |= opt->setmask;
 986                         }
 987                         break;
 988                 }
 989         }
 990         if (!opt->option_name) {
 991                 reiserfs_warning(s, "super-6502",
 992                                  "unknown mount option \"%s\"", p);
 993                 return -1;
 994         }
 995
 996         p += strlen(opt->option_name);
 997         switch (*p) {
 998         case '=':
 999                 if (!opt->arg_required) {
1000                         reiserfs_warning(s, "super-6503",
1001                                          "the option \"%s\" does not "
1002                                          "require an argument\n",
1003                                          opt->option_name);
1004                         return -1;
1005                 }
1006                 break;
1007
1008         case 0:
1009                 if (opt->arg_required) {
1010                         reiserfs_warning(s, "super-6504",
1011                                          "the option \"%s\" requires an "
1012                                          "argument\n", opt->option_name);
1013                         return -1;
1014                 }
1015                 break;
1016         default:
1017                 reiserfs_warning(s, "super-6505",
1018                                  "head of option \"%s\" is only correct\n",
1019                                  opt->option_name);
1020                 return -1;
1021         }
1022
1023         /*
1024          * move to the argument, or to next option if argument is not
1025          * required
1026          */
1027         p++;
1028
1029         if (opt->arg_required
1030             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1031             && !strlen(p)) {
1032                 /* this catches "option=," if not allowed */
1033                 reiserfs_warning(s, "super-6506",
1034                                  "empty argument for \"%s\"\n",
1035                                  opt->option_name);
1036                 return -1;
1037         }
1038
1039         if (!opt->values) {
1040                 /* *=NULLopt_arg contains pointer to argument */
1041                 *opt_arg = p;
1042                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1043         }
1044
1045         /* values possible for this option are listed in opt->values */
1046         for (arg = opt->values; arg->value; arg++) {
1047                 if (!strcmp(p, arg->value)) {
1048                         if (bit_flags) {
1049                                 *bit_flags &= ~arg->clrmask;
1050                                 *bit_flags |= arg->setmask;
1051                         }
1052                         return opt->arg_required;
1053                 }
1054         }
1055
1056         reiserfs_warning(s, "super-6506",
1057                          "bad value \"%s\" for option \"%s\"\n", p,
1058                          opt->option_name);
1059         return -1;
1060 }
1061
1062 /* returns 0 if something is wrong in option string, 1 - otherwise */
1063 static int reiserfs_parse_options(struct super_block *s,
1064
1065                                   /* string given via mount's -o */
1066                                   char *options,
1067
1068                                   /*
1069                                    * after the parsing phase, contains the
1070                                    * collection of bitflags defining what
1071                                    * mount options were selected.
1072                                    */
1073                                   unsigned long *mount_options,
1074
1075                                   /* strtol-ed from NNN of resize=NNN */
1076                                   unsigned long *blocks,
1077                                   char **jdev_name,
1078                                   unsigned int *commit_max_age,
1079                                   char **qf_names,
1080                                   unsigned int *qfmt)
1081 {
1082         int c;
1083         char *arg = NULL;
1084         char *pos;
1085         opt_desc_t opts[] = {
1086                 /*
1087                  * Compatibility stuff, so that -o notail for old
1088                  * setups still work
1089                  */
1090                 {"tails",.arg_required = 't',.values = tails},
1091                 {"notail",.clrmask =
1092                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1093                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1094                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1095                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1096                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1097 #ifdef CONFIG_REISERFS_FS_XATTR
1098                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1099                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1100 #else
1101                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1102                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1103 #endif
1104 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1105                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1106                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1107 #else
1108                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1109                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1110 #endif
1111                 {.option_name = "nolog"},
1112                 {"replayonly",.setmask = 1 << REPLAYONLY},
1113                 {"block-allocator",.arg_required = 'a',.values = balloc},
1114                 {"data",.arg_required = 'd',.values = logging_mode},
1115                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1116                 {"resize",.arg_required = 'r',.values = NULL},
1117                 {"jdev",.arg_required = 'j',.values = NULL},
1118                 {"nolargeio",.arg_required = 'w',.values = NULL},
1119                 {"commit",.arg_required = 'c',.values = NULL},
1120                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1121                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1122                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1123                 {"errors",.arg_required = 'e',.values = error_actions},
1124                 {"usrjquota",.arg_required =
1125                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1126                 {"grpjquota",.arg_required =
1127                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1128                 {"jqfmt",.arg_required = 'f',.values = NULL},
1129                 {.option_name = NULL}
1130         };
1131
1132         *blocks = 0;
1133         if (!options || !*options)
1134                 /*
1135                  * use default configuration: create tails, journaling on, no
1136                  * conversion to newest format
1137                  */
1138                 return 1;
1139
1140         for (pos = options; pos;) {
1141                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1142                 if (c == -1)
1143                         /* wrong option is given */
1144                         return 0;
1145
1146                 if (c == 'r') {
1147                         char *p;
1148
1149                         p = NULL;
1150                         /* "resize=NNN" or "resize=auto" */
1151
1152                         if (!strcmp(arg, "auto")) {
1153                                 /* From JFS code, to auto-get the size. */
1154                                 *blocks =
1155                                     s->s_bdev->bd_inode->i_size >> s->
1156                                     s_blocksize_bits;
1157                         } else {
1158                                 *blocks = simple_strtoul(arg, &p, 0);
1159                                 if (*p != '\0') {
1160                                         /* NNN does not look like a number */
1161                                         reiserfs_warning(s, "super-6507",
1162                                                          "bad value %s for "
1163                                                          "-oresize\n", arg);
1164                                         return 0;
1165                                 }
1166                         }
1167                 }
1168
1169                 if (c == 'c') {
1170                         char *p = NULL;
1171                         unsigned long val = simple_strtoul(arg, &p, 0);
1172                         /* commit=NNN (time in seconds) */
1173                         if (*p != '\0' || val >= (unsigned int)-1) {
1174                                 reiserfs_warning(s, "super-6508",
1175                                                  "bad value %s for -ocommit\n",
1176                                                  arg);
1177                                 return 0;
1178                         }
1179                         *commit_max_age = (unsigned int)val;
1180                 }
1181
1182                 if (c == 'w') {
1183                         reiserfs_warning(s, "super-6509", "nolargeio option "
1184                                          "is no longer supported");
1185                         return 0;
1186                 }
1187
1188                 if (c == 'j') {
1189                         if (arg && *arg && jdev_name) {
1190                                 /* Hm, already assigned? */
1191                                 if (*jdev_name) {
1192                                         reiserfs_warning(s, "super-6510",
1193                                                          "journal device was "
1194                                                          "already specified to "
1195                                                          "be %s", *jdev_name);
1196                                         return 0;
1197                                 }
1198                                 *jdev_name = arg;
1199                         }
1200                 }
1201 #ifdef CONFIG_QUOTA
1202                 if (c == 'u' || c == 'g') {
1203                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1204
1205                         if (sb_any_quota_loaded(s) &&
1206                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1207                                 reiserfs_warning(s, "super-6511",
1208                                                  "cannot change journaled "
1209                                                  "quota options when quota "
1210                                                  "turned on.");
1211                                 return 0;
1212                         }
1213                         if (*arg) {     /* Some filename specified? */
1214                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1215                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1216                                               arg)) {
1217                                         reiserfs_warning(s, "super-6512",
1218                                                          "%s quota file "
1219                                                          "already specified.",
1220                                                          QTYPE2NAME(qtype));
1221                                         return 0;
1222                                 }
1223                                 if (strchr(arg, '/')) {
1224                                         reiserfs_warning(s, "super-6513",
1225                                                          "quotafile must be "
1226                                                          "on filesystem root.");
1227                                         return 0;
1228                                 }
1229                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1230                                 if (!qf_names[qtype]) {
1231                                         reiserfs_warning(s, "reiserfs-2502",
1232                                                          "not enough memory "
1233                                                          "for storing "
1234                                                          "quotafile name.");
1235                                         return 0;
1236                                 }
1237                                 if (qtype == USRQUOTA)
1238                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1239                                 else
1240                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1241                         } else {
1242                                 if (qf_names[qtype] !=
1243                                     REISERFS_SB(s)->s_qf_names[qtype])
1244                                         kfree(qf_names[qtype]);
1245                                 qf_names[qtype] = NULL;
1246                                 if (qtype == USRQUOTA)
1247                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1248                                 else
1249                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1250                         }
1251                 }
1252                 if (c == 'f') {
1253                         if (!strcmp(arg, "vfsold"))
1254                                 *qfmt = QFMT_VFS_OLD;
1255                         else if (!strcmp(arg, "vfsv0"))
1256                                 *qfmt = QFMT_VFS_V0;
1257                         else {
1258                                 reiserfs_warning(s, "super-6514",
1259                                                  "unknown quota format "
1260                                                  "specified.");
1261                                 return 0;
1262                         }
1263                         if (sb_any_quota_loaded(s) &&
1264                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1265                                 reiserfs_warning(s, "super-6515",
1266                                                  "cannot change journaled "
1267                                                  "quota options when quota "
1268                                                  "turned on.");
1269                                 return 0;
1270                         }
1271                 }
1272 #else
1273                 if (c == 'u' || c == 'g' || c == 'f') {
1274                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1275                                          "quota options not supported.");
1276                         return 0;
1277                 }
1278 #endif
1279         }
1280
1281 #ifdef CONFIG_QUOTA
1282         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1283             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1284                 reiserfs_warning(s, "super-6515",
1285                                  "journaled quota format not specified.");
1286                 return 0;
1287         }
1288         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1289                sb_has_quota_loaded(s, USRQUOTA)) ||
1290             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1291                sb_has_quota_loaded(s, GRPQUOTA))) {
1292                 reiserfs_warning(s, "super-6516", "quota options must "
1293                                  "be present when quota is turned on.");
1294                 return 0;
1295         }
1296 #endif
1297
1298         return 1;
1299 }
1300
1301 static void switch_data_mode(struct super_block *s, unsigned long mode)
1302 {
1303         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1304                                          (1 << REISERFS_DATA_ORDERED) |
1305                                          (1 << REISERFS_DATA_WRITEBACK));
1306         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1307 }
1308
1309 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1310 {
1311         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1312                 if (!reiserfs_data_log(s)) {
1313                         switch_data_mode(s, REISERFS_DATA_LOG);
1314                         reiserfs_info(s, "switching to journaled data mode\n");
1315                 }
1316         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1317                 if (!reiserfs_data_ordered(s)) {
1318                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1319                         reiserfs_info(s, "switching to ordered data mode\n");
1320                 }
1321         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1322                 if (!reiserfs_data_writeback(s)) {
1323                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1324                         reiserfs_info(s, "switching to writeback data mode\n");
1325                 }
1326         }
1327 }
1328
1329 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1330 {
1331         int flush = (1 << REISERFS_BARRIER_FLUSH);
1332         int none = (1 << REISERFS_BARRIER_NONE);
1333         int all_barrier = flush | none;
1334
1335         if (bits & all_barrier) {
1336                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1337                 if (bits & flush) {
1338                         REISERFS_SB(s)->s_mount_opt |= flush;
1339                         printk("reiserfs: enabling write barrier flush mode\n");
1340                 } else if (bits & none) {
1341                         REISERFS_SB(s)->s_mount_opt |= none;
1342                         printk("reiserfs: write barriers turned off\n");
1343                 }
1344         }
1345 }
1346
1347 static void handle_attrs(struct super_block *s)
1348 {
1349         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1350
1351         if (reiserfs_attrs(s)) {
1352                 if (old_format_only(s)) {
1353                         reiserfs_warning(s, "super-6517", "cannot support "
1354                                          "attributes on 3.5.x disk format");
1355                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1356                         return;
1357                 }
1358                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1359                         reiserfs_warning(s, "super-6518", "cannot support "
1360                                          "attributes until flag is set in "
1361                                          "super-block");
1362                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1363                 }
1364         }
1365 }
1366
1367 #ifdef CONFIG_QUOTA
1368 static void handle_quota_files(struct super_block *s, char **qf_names,
1369                                unsigned int *qfmt)
1370 {
1371         int i;
1372
1373         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1374                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1375                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1376                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1377         }
1378         if (*qfmt)
1379                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1380 }
1381 #endif
1382
1383 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1384 {
1385         struct reiserfs_super_block *rs;
1386         struct reiserfs_transaction_handle th;
1387         unsigned long blocks;
1388         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1389         unsigned long safe_mask = 0;
1390         unsigned int commit_max_age = (unsigned int)-1;
1391         struct reiserfs_journal *journal = SB_JOURNAL(s);
1392         char *new_opts = kstrdup(arg, GFP_KERNEL);
1393         int err;
1394         char *qf_names[REISERFS_MAXQUOTAS];
1395         unsigned int qfmt = 0;
1396 #ifdef CONFIG_QUOTA
1397         int i;
1398 #endif
1399
1400         sync_filesystem(s);
1401         reiserfs_write_lock(s);
1402
1403 #ifdef CONFIG_QUOTA
1404         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1405 #endif
1406
1407         rs = SB_DISK_SUPER_BLOCK(s);
1408
1409         if (!reiserfs_parse_options
1410             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1411             qf_names, &qfmt)) {
1412 #ifdef CONFIG_QUOTA
1413                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1414                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1415                                 kfree(qf_names[i]);
1416 #endif
1417                 err = -EINVAL;
1418                 goto out_err_unlock;
1419         }
1420 #ifdef CONFIG_QUOTA
1421         handle_quota_files(s, qf_names, &qfmt);
1422 #endif
1423
1424         handle_attrs(s);
1425
1426         /* Add options that are safe here */
1427         safe_mask |= 1 << REISERFS_SMALLTAIL;
1428         safe_mask |= 1 << REISERFS_LARGETAIL;
1429         safe_mask |= 1 << REISERFS_NO_BORDER;
1430         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1431         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1432         safe_mask |= 1 << REISERFS_TEST4;
1433         safe_mask |= 1 << REISERFS_ATTRS;
1434         safe_mask |= 1 << REISERFS_XATTRS_USER;
1435         safe_mask |= 1 << REISERFS_POSIXACL;
1436         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1437         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1438         safe_mask |= 1 << REISERFS_ERROR_RO;
1439         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1440         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1441         safe_mask |= 1 << REISERFS_USRQUOTA;
1442         safe_mask |= 1 << REISERFS_GRPQUOTA;
1443
1444         /*
1445          * Update the bitmask, taking care to keep
1446          * the bits we're not allowed to change here
1447          */
1448         REISERFS_SB(s)->s_mount_opt =
1449             (REISERFS_SB(s)->
1450              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1451
1452         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1453                 journal->j_max_commit_age = commit_max_age;
1454                 journal->j_max_trans_age = commit_max_age;
1455         } else if (commit_max_age == 0) {
1456                 /* 0 means restore defaults. */
1457                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1458                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1459         }
1460
1461         if (blocks) {
1462                 err = reiserfs_resize(s, blocks);
1463                 if (err != 0)
1464                         goto out_err_unlock;
1465         }
1466
1467         if (*mount_flags & MS_RDONLY) {
1468                 reiserfs_write_unlock(s);
1469                 reiserfs_xattr_init(s, *mount_flags);
1470                 /* remount read-only */
1471                 if (s->s_flags & MS_RDONLY)
1472                         /* it is read-only already */
1473                         goto out_ok_unlocked;
1474
1475                 err = dquot_suspend(s, -1);
1476                 if (err < 0)
1477                         goto out_err;
1478
1479                 /* try to remount file system with read-only permissions */
1480                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1481                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1482                         goto out_ok_unlocked;
1483                 }
1484
1485                 reiserfs_write_lock(s);
1486
1487                 err = journal_begin(&th, s, 10);
1488                 if (err)
1489                         goto out_err_unlock;
1490
1491                 /* Mounting a rw partition read-only. */
1492                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1493                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1494                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1495         } else {
1496                 /* remount read-write */
1497                 if (!(s->s_flags & MS_RDONLY)) {
1498                         reiserfs_write_unlock(s);
1499                         reiserfs_xattr_init(s, *mount_flags);
1500                         goto out_ok_unlocked;   /* We are read-write already */
1501                 }
1502
1503                 if (reiserfs_is_journal_aborted(journal)) {
1504                         err = journal->j_errno;
1505                         goto out_err_unlock;
1506                 }
1507
1508                 handle_data_mode(s, mount_options);
1509                 handle_barrier_mode(s, mount_options);
1510                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1511
1512                 /* now it is safe to call journal_begin */
1513                 s->s_flags &= ~MS_RDONLY;
1514                 err = journal_begin(&th, s, 10);
1515                 if (err)
1516                         goto out_err_unlock;
1517
1518                 /* Mount a partition which is read-only, read-write */
1519                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1520                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1521                 s->s_flags &= ~MS_RDONLY;
1522                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1523                 if (!old_format_only(s))
1524                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1525                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1526                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1527                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1528         }
1529         /* this will force a full flush of all journal lists */
1530         SB_JOURNAL(s)->j_must_wait = 1;
1531         err = journal_end(&th);
1532         if (err)
1533                 goto out_err_unlock;
1534
1535         reiserfs_write_unlock(s);
1536         if (!(*mount_flags & MS_RDONLY)) {
1537                 dquot_resume(s, -1);
1538                 reiserfs_write_lock(s);
1539                 finish_unfinished(s);
1540                 reiserfs_write_unlock(s);
1541                 reiserfs_xattr_init(s, *mount_flags);
1542         }
1543
1544 out_ok_unlocked:
1545         replace_mount_options(s, new_opts);
1546         return 0;
1547
1548 out_err_unlock:
1549         reiserfs_write_unlock(s);
1550 out_err:
1551         kfree(new_opts);
1552         return err;
1553 }
1554
1555 static int read_super_block(struct super_block *s, int offset)
1556 {
1557         struct buffer_head *bh;
1558         struct reiserfs_super_block *rs;
1559         int fs_blocksize;
1560
1561         bh = sb_bread(s, offset / s->s_blocksize);
1562         if (!bh) {
1563                 reiserfs_warning(s, "sh-2006",
1564                                  "bread failed (dev %s, block %lu, size %lu)",
1565                                  s->s_id, offset / s->s_blocksize,
1566                                  s->s_blocksize);
1567                 return 1;
1568         }
1569
1570         rs = (struct reiserfs_super_block *)bh->b_data;
1571         if (!is_any_reiserfs_magic_string(rs)) {
1572                 brelse(bh);
1573                 return 1;
1574         }
1575         /*
1576          * ok, reiserfs signature (old or new) found in at the given offset
1577          */
1578         fs_blocksize = sb_blocksize(rs);
1579         brelse(bh);
1580         sb_set_blocksize(s, fs_blocksize);
1581
1582         bh = sb_bread(s, offset / s->s_blocksize);
1583         if (!bh) {
1584                 reiserfs_warning(s, "sh-2007",
1585                                  "bread failed (dev %s, block %lu, size %lu)",
1586                                  s->s_id, offset / s->s_blocksize,
1587                                  s->s_blocksize);
1588                 return 1;
1589         }
1590
1591         rs = (struct reiserfs_super_block *)bh->b_data;
1592         if (sb_blocksize(rs) != s->s_blocksize) {
1593                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1594                                  "filesystem on (dev %s, block %llu, size %lu)",
1595                                  s->s_id,
1596                                  (unsigned long long)bh->b_blocknr,
1597                                  s->s_blocksize);
1598                 brelse(bh);
1599                 return 1;
1600         }
1601
1602         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1603                 brelse(bh);
1604                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1605                                  "--rebuild-tree run detected. Please run\n"
1606                                  "reiserfsck --rebuild-tree and wait for a "
1607                                  "completion. If that fails\n"
1608                                  "get newer reiserfsprogs package");
1609                 return 1;
1610         }
1611
1612         SB_BUFFER_WITH_SB(s) = bh;
1613         SB_DISK_SUPER_BLOCK(s) = rs;
1614
1615         /*
1616          * magic is of non-standard journal filesystem, look at s_version to
1617          * find which format is in use
1618          */
1619         if (is_reiserfs_jr(rs)) {
1620                 if (sb_version(rs) == REISERFS_VERSION_2)
1621                         reiserfs_info(s, "found reiserfs format \"3.6\""
1622                                       " with non-standard journal\n");
1623                 else if (sb_version(rs) == REISERFS_VERSION_1)
1624                         reiserfs_info(s, "found reiserfs format \"3.5\""
1625                                       " with non-standard journal\n");
1626                 else {
1627                         reiserfs_warning(s, "sh-2012", "found unknown "
1628                                          "format \"%u\" of reiserfs with "
1629                                          "non-standard magic", sb_version(rs));
1630                         return 1;
1631                 }
1632         } else
1633                 /*
1634                  * s_version of standard format may contain incorrect
1635                  * information, so we just look at the magic string
1636                  */
1637                 reiserfs_info(s,
1638                               "found reiserfs format \"%s\" with standard journal\n",
1639                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1640
1641         s->s_op = &reiserfs_sops;
1642         s->s_export_op = &reiserfs_export_ops;
1643 #ifdef CONFIG_QUOTA
1644         s->s_qcop = &reiserfs_qctl_operations;
1645         s->dq_op = &reiserfs_quota_operations;
1646         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1647 #endif
1648
1649         /*
1650          * new format is limited by the 32 bit wide i_blocks field, want to
1651          * be one full block below that.
1652          */
1653         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1654         return 0;
1655 }
1656
1657 /* after journal replay, reread all bitmap and super blocks */
1658 static int reread_meta_blocks(struct super_block *s)
1659 {
1660         ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1661         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1662         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1663                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1664                 return 1;
1665         }
1666
1667         return 0;
1668 }
1669
1670 /* hash detection stuff */
1671
1672 /*
1673  * if root directory is empty - we set default - Yura's - hash and
1674  * warn about it
1675  * FIXME: we look for only one name in a directory. If tea and yura
1676  * both have the same value - we ask user to send report to the
1677  * mailing list
1678  */
1679 static __u32 find_hash_out(struct super_block *s)
1680 {
1681         int retval;
1682         struct inode *inode;
1683         struct cpu_key key;
1684         INITIALIZE_PATH(path);
1685         struct reiserfs_dir_entry de;
1686         struct reiserfs_de_head *deh;
1687         __u32 hash = DEFAULT_HASH;
1688         __u32 deh_hashval, teahash, r5hash, yurahash;
1689
1690         inode = d_inode(s->s_root);
1691
1692         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1693         retval = search_by_entry_key(s, &key, &path, &de);
1694         if (retval == IO_ERROR) {
1695                 pathrelse(&path);
1696                 return UNSET_HASH;
1697         }
1698         if (retval == NAME_NOT_FOUND)
1699                 de.de_entry_num--;
1700
1701         set_de_name_and_namelen(&de);
1702         deh = de.de_deh + de.de_entry_num;
1703
1704         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1705                 /* allow override in this case */
1706                 if (reiserfs_rupasov_hash(s))
1707                         hash = YURA_HASH;
1708                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1709                 goto out;
1710         }
1711
1712         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1713         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1714         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1715         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1716
1717         if ((teahash == r5hash && deh_hashval == r5hash) ||
1718             (teahash == yurahash && deh_hashval == yurahash) ||
1719             (r5hash == yurahash && deh_hashval == yurahash)) {
1720                 reiserfs_warning(s, "reiserfs-2506",
1721                                  "Unable to automatically detect hash "
1722                                  "function. Please mount with -o "
1723                                  "hash={tea,rupasov,r5}");
1724                 hash = UNSET_HASH;
1725                 goto out;
1726         }
1727
1728         if (deh_hashval == yurahash)
1729                 hash = YURA_HASH;
1730         else if (deh_hashval == teahash)
1731                 hash = TEA_HASH;
1732         else if (deh_hashval == r5hash)
1733                 hash = R5_HASH;
1734         else {
1735                 reiserfs_warning(s, "reiserfs-2506",
1736                                  "Unrecognised hash function");
1737                 hash = UNSET_HASH;
1738         }
1739 out:
1740         pathrelse(&path);
1741         return hash;
1742 }
1743
1744 /* finds out which hash names are sorted with */
1745 static int what_hash(struct super_block *s)
1746 {
1747         __u32 code;
1748
1749         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1750
1751         /*
1752          * reiserfs_hash_detect() == true if any of the hash mount options
1753          * were used.  We must check them to make sure the user isn't
1754          * using a bad hash value
1755          */
1756         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1757                 code = find_hash_out(s);
1758
1759         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1760                 /*
1761                  * detection has found the hash, and we must check against the
1762                  * mount options
1763                  */
1764                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1765                         reiserfs_warning(s, "reiserfs-2507",
1766                                          "Error, %s hash detected, "
1767                                          "unable to force rupasov hash",
1768                                          reiserfs_hashname(code));
1769                         code = UNSET_HASH;
1770                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1771                         reiserfs_warning(s, "reiserfs-2508",
1772                                          "Error, %s hash detected, "
1773                                          "unable to force tea hash",
1774                                          reiserfs_hashname(code));
1775                         code = UNSET_HASH;
1776                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1777                         reiserfs_warning(s, "reiserfs-2509",
1778                                          "Error, %s hash detected, "
1779                                          "unable to force r5 hash",
1780                                          reiserfs_hashname(code));
1781                         code = UNSET_HASH;
1782                 }
1783         } else {
1784                 /*
1785                  * find_hash_out was not called or
1786                  * could not determine the hash
1787                  */
1788                 if (reiserfs_rupasov_hash(s)) {
1789                         code = YURA_HASH;
1790                 } else if (reiserfs_tea_hash(s)) {
1791                         code = TEA_HASH;
1792                 } else if (reiserfs_r5_hash(s)) {
1793                         code = R5_HASH;
1794                 }
1795         }
1796
1797         /*
1798          * if we are mounted RW, and we have a new valid hash code, update
1799          * the super
1800          */
1801         if (code != UNSET_HASH &&
1802             !(s->s_flags & MS_RDONLY) &&
1803             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1804                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1805         }
1806         return code;
1807 }
1808
1809 /* return pointer to appropriate function */
1810 static hashf_t hash_function(struct super_block *s)
1811 {
1812         switch (what_hash(s)) {
1813         case TEA_HASH:
1814                 reiserfs_info(s, "Using tea hash to sort names\n");
1815                 return keyed_hash;
1816         case YURA_HASH:
1817                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1818                 return yura_hash;
1819         case R5_HASH:
1820                 reiserfs_info(s, "Using r5 hash to sort names\n");
1821                 return r5_hash;
1822         }
1823         return NULL;
1824 }
1825
1826 /* this is used to set up correct value for old partitions */
1827 static int function2code(hashf_t func)
1828 {
1829         if (func == keyed_hash)
1830                 return TEA_HASH;
1831         if (func == yura_hash)
1832                 return YURA_HASH;
1833         if (func == r5_hash)
1834                 return R5_HASH;
1835
1836         BUG();                  /* should never happen */
1837
1838         return 0;
1839 }
1840
1841 #define SWARN(silent, s, id, ...)                       \
1842         if (!(silent))                          \
1843                 reiserfs_warning(s, id, __VA_ARGS__)
1844
1845 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1846 {
1847         struct inode *root_inode;
1848         struct reiserfs_transaction_handle th;
1849         int old_format = 0;
1850         unsigned long blocks;
1851         unsigned int commit_max_age = 0;
1852         int jinit_done = 0;
1853         struct reiserfs_iget_args args;
1854         struct reiserfs_super_block *rs;
1855         char *jdev_name;
1856         struct reiserfs_sb_info *sbi;
1857         int errval = -EINVAL;
1858         char *qf_names[REISERFS_MAXQUOTAS] = {};
1859         unsigned int qfmt = 0;
1860
1861         save_mount_options(s, data);
1862
1863         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1864         if (!sbi)
1865                 return -ENOMEM;
1866         s->s_fs_info = sbi;
1867         /* Set default values for options: non-aggressive tails, RO on errors */
1868         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1869         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1870         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1871         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1872         sbi->s_alloc_options.preallocmin = 0;
1873         /* Preallocate by 16 blocks (17-1) at once */
1874         sbi->s_alloc_options.preallocsize = 17;
1875         /* setup default block allocator options */
1876         reiserfs_init_alloc_options(s);
1877
1878         spin_lock_init(&sbi->old_work_lock);
1879         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1880         mutex_init(&sbi->lock);
1881         sbi->lock_depth = -1;
1882
1883         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1884                                          s->s_id);
1885         if (!sbi->commit_wq) {
1886                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1887                 errval = -ENOMEM;
1888                 goto error_unlocked;
1889         }
1890
1891         jdev_name = NULL;
1892         if (reiserfs_parse_options
1893             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1894              &commit_max_age, qf_names, &qfmt) == 0) {
1895                 goto error_unlocked;
1896         }
1897         if (jdev_name && jdev_name[0]) {
1898                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1899                 if (!sbi->s_jdev) {
1900                         SWARN(silent, s, "", "Cannot allocate memory for "
1901                                 "journal device name");
1902                         goto error;
1903                 }
1904         }
1905 #ifdef CONFIG_QUOTA
1906         handle_quota_files(s, qf_names, &qfmt);
1907 #endif
1908
1909         if (blocks) {
1910                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1911                 goto error_unlocked;
1912         }
1913
1914         /*
1915          * try old format (undistributed bitmap, super block in 8-th 1k
1916          * block of a device)
1917          */
1918         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1919                 old_format = 1;
1920
1921         /*
1922          * try new format (64-th 1k block), which can contain reiserfs
1923          * super block
1924          */
1925         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1926                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1927                       s->s_id);
1928                 goto error_unlocked;
1929         }
1930
1931         rs = SB_DISK_SUPER_BLOCK(s);
1932         /*
1933          * Let's do basic sanity check to verify that underlying device is not
1934          * smaller than the filesystem. If the check fails then abort and
1935          * scream, because bad stuff will happen otherwise.
1936          */
1937         if (s->s_bdev && s->s_bdev->bd_inode
1938             && i_size_read(s->s_bdev->bd_inode) <
1939             sb_block_count(rs) * sb_blocksize(rs)) {
1940                 SWARN(silent, s, "", "Filesystem cannot be "
1941                       "mounted because it is bigger than the device");
1942                 SWARN(silent, s, "", "You may need to run fsck "
1943                       "or increase size of your LVM partition");
1944                 SWARN(silent, s, "", "Or may be you forgot to "
1945                       "reboot after fdisk when it told you to");
1946                 goto error_unlocked;
1947         }
1948
1949         sbi->s_mount_state = SB_REISERFS_STATE(s);
1950         sbi->s_mount_state = REISERFS_VALID_FS;
1951
1952         if ((errval = reiserfs_init_bitmap_cache(s))) {
1953                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1954                 goto error_unlocked;
1955         }
1956
1957         errval = -EINVAL;
1958 #ifdef CONFIG_REISERFS_CHECK
1959         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1960         SWARN(silent, s, "", "- it is slow mode for debugging.");
1961 #endif
1962
1963         /* make data=ordered the default */
1964         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1965             !reiserfs_data_writeback(s)) {
1966                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1967         }
1968
1969         if (reiserfs_data_log(s)) {
1970                 reiserfs_info(s, "using journaled data mode\n");
1971         } else if (reiserfs_data_ordered(s)) {
1972                 reiserfs_info(s, "using ordered data mode\n");
1973         } else {
1974                 reiserfs_info(s, "using writeback data mode\n");
1975         }
1976         if (reiserfs_barrier_flush(s)) {
1977                 printk("reiserfs: using flush barriers\n");
1978         }
1979
1980         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1981                 SWARN(silent, s, "sh-2022",
1982                       "unable to initialize journal space");
1983                 goto error_unlocked;
1984         } else {
1985                 /*
1986                  * once this is set, journal_release must be called
1987                  * if we error out of the mount
1988                  */
1989                 jinit_done = 1;
1990         }
1991
1992         if (reread_meta_blocks(s)) {
1993                 SWARN(silent, s, "jmacd-9",
1994                       "unable to reread meta blocks after journal init");
1995                 goto error_unlocked;
1996         }
1997
1998         if (replay_only(s))
1999                 goto error_unlocked;
2000
2001         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2002                 SWARN(silent, s, "clm-7000",
2003                       "Detected readonly device, marking FS readonly");
2004                 s->s_flags |= MS_RDONLY;
2005         }
2006         args.objectid = REISERFS_ROOT_OBJECTID;
2007         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2008         root_inode =
2009             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2010                          reiserfs_init_locked_inode, (void *)&args);
2011         if (!root_inode) {
2012                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2013                 goto error_unlocked;
2014         }
2015
2016         /*
2017          * This path assumed to be called with the BKL in the old times.
2018          * Now we have inherited the big reiserfs lock from it and many
2019          * reiserfs helpers called in the mount path and elsewhere require
2020          * this lock to be held even if it's not always necessary. Let's be
2021          * conservative and hold it early. The window can be reduced after
2022          * careful review of the code.
2023          */
2024         reiserfs_write_lock(s);
2025
2026         if (root_inode->i_state & I_NEW) {
2027                 reiserfs_read_locked_inode(root_inode, &args);
2028                 unlock_new_inode(root_inode);
2029         }
2030
2031         s->s_root = d_make_root(root_inode);
2032         if (!s->s_root)
2033                 goto error;
2034         /* define and initialize hash function */
2035         sbi->s_hash_function = hash_function(s);
2036         if (sbi->s_hash_function == NULL) {
2037                 dput(s->s_root);
2038                 s->s_root = NULL;
2039                 goto error;
2040         }
2041
2042         if (is_reiserfs_3_5(rs)
2043             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2044                 set_bit(REISERFS_3_5, &sbi->s_properties);
2045         else if (old_format)
2046                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2047         else
2048                 set_bit(REISERFS_3_6, &sbi->s_properties);
2049
2050         if (!(s->s_flags & MS_RDONLY)) {
2051
2052                 errval = journal_begin(&th, s, 1);
2053                 if (errval) {
2054                         dput(s->s_root);
2055                         s->s_root = NULL;
2056                         goto error;
2057                 }
2058                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2059
2060                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2061                 set_sb_fs_state(rs, 0);
2062
2063                 /*
2064                  * Clear out s_bmap_nr if it would wrap. We can handle this
2065                  * case, but older revisions can't. This will cause the
2066                  * file system to fail mount on those older implementations,
2067                  * avoiding corruption. -jeffm
2068                  */
2069                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2070                     sb_bmap_nr(rs) != 0) {
2071                         reiserfs_warning(s, "super-2030", "This file system "
2072                                         "claims to use %u bitmap blocks in "
2073                                         "its super block, but requires %u. "
2074                                         "Clearing to zero.", sb_bmap_nr(rs),
2075                                         reiserfs_bmap_count(s));
2076
2077                         set_sb_bmap_nr(rs, 0);
2078                 }
2079
2080                 if (old_format_only(s)) {
2081                         /*
2082                          * filesystem of format 3.5 either with standard
2083                          * or non-standard journal
2084                          */
2085                         if (convert_reiserfs(s)) {
2086                                 /* and -o conv is given */
2087                                 if (!silent)
2088                                         reiserfs_info(s,
2089                                                       "converting 3.5 filesystem to the 3.6 format");
2090
2091                                 if (is_reiserfs_3_5(rs))
2092                                         /*
2093                                          * put magic string of 3.6 format.
2094                                          * 2.2 will not be able to
2095                                          * mount this filesystem anymore
2096                                          */
2097                                         memcpy(rs->s_v1.s_magic,
2098                                                reiserfs_3_6_magic_string,
2099                                                sizeof
2100                                                (reiserfs_3_6_magic_string));
2101
2102                                 set_sb_version(rs, REISERFS_VERSION_2);
2103                                 reiserfs_convert_objectid_map_v1(s);
2104                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2105                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2106                         } else if (!silent) {
2107                                 reiserfs_info(s, "using 3.5.x disk format\n");
2108                         }
2109                 } else
2110                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2111
2112
2113                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2114                 errval = journal_end(&th);
2115                 if (errval) {
2116                         dput(s->s_root);
2117                         s->s_root = NULL;
2118                         goto error;
2119                 }
2120
2121                 reiserfs_write_unlock(s);
2122                 if ((errval = reiserfs_lookup_privroot(s)) ||
2123                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2124                         dput(s->s_root);
2125                         s->s_root = NULL;
2126                         goto error_unlocked;
2127                 }
2128                 reiserfs_write_lock(s);
2129
2130                 /*
2131                  * look for files which were to be removed in previous session
2132                  */
2133                 finish_unfinished(s);
2134         } else {
2135                 if (old_format_only(s) && !silent) {
2136                         reiserfs_info(s, "using 3.5.x disk format\n");
2137                 }
2138
2139                 reiserfs_write_unlock(s);
2140                 if ((errval = reiserfs_lookup_privroot(s)) ||
2141                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2142                         dput(s->s_root);
2143                         s->s_root = NULL;
2144                         goto error_unlocked;
2145                 }
2146                 reiserfs_write_lock(s);
2147         }
2148         /*
2149          * mark hash in super block: it could be unset. overwrite should be ok
2150          */
2151         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2152
2153         handle_attrs(s);
2154
2155         reiserfs_proc_info_init(s);
2156
2157         init_waitqueue_head(&(sbi->s_wait));
2158         spin_lock_init(&sbi->bitmap_lock);
2159
2160         reiserfs_write_unlock(s);
2161
2162         return (0);
2163
2164 error:
2165         reiserfs_write_unlock(s);
2166
2167 error_unlocked:
2168         /* kill the commit thread, free journal ram */
2169         if (jinit_done) {
2170                 reiserfs_write_lock(s);
2171                 journal_release_error(NULL, s);
2172                 reiserfs_write_unlock(s);
2173         }
2174
2175         if (sbi->commit_wq)
2176                 destroy_workqueue(sbi->commit_wq);
2177
2178         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2179
2180         reiserfs_free_bitmap_cache(s);
2181         if (SB_BUFFER_WITH_SB(s))
2182                 brelse(SB_BUFFER_WITH_SB(s));
2183 #ifdef CONFIG_QUOTA
2184         {
2185                 int j;
2186                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2187                         kfree(qf_names[j]);
2188         }
2189 #endif
2190         kfree(sbi);
2191
2192         s->s_fs_info = NULL;
2193         return errval;
2194 }
2195
2196 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2197 {
2198         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2199
2200         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2201         buf->f_bfree = sb_free_blocks(rs);
2202         buf->f_bavail = buf->f_bfree;
2203         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2204         buf->f_bsize = dentry->d_sb->s_blocksize;
2205         /* changed to accommodate gcc folks. */
2206         buf->f_type = REISERFS_SUPER_MAGIC;
2207         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2208         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2209                                 sizeof(rs->s_uuid)/2);
2210
2211         return 0;
2212 }
2213
2214 #ifdef CONFIG_QUOTA
2215 static int reiserfs_write_dquot(struct dquot *dquot)
2216 {
2217         struct reiserfs_transaction_handle th;
2218         int ret, err;
2219         int depth;
2220
2221         reiserfs_write_lock(dquot->dq_sb);
2222         ret =
2223             journal_begin(&th, dquot->dq_sb,
2224                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2225         if (ret)
2226                 goto out;
2227         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2228         ret = dquot_commit(dquot);
2229         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2230         err = journal_end(&th);
2231         if (!ret && err)
2232                 ret = err;
2233 out:
2234         reiserfs_write_unlock(dquot->dq_sb);
2235         return ret;
2236 }
2237
2238 static int reiserfs_acquire_dquot(struct dquot *dquot)
2239 {
2240         struct reiserfs_transaction_handle th;
2241         int ret, err;
2242         int depth;
2243
2244         reiserfs_write_lock(dquot->dq_sb);
2245         ret =
2246             journal_begin(&th, dquot->dq_sb,
2247                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2248         if (ret)
2249                 goto out;
2250         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2251         ret = dquot_acquire(dquot);
2252         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2253         err = journal_end(&th);
2254         if (!ret && err)
2255                 ret = err;
2256 out:
2257         reiserfs_write_unlock(dquot->dq_sb);
2258         return ret;
2259 }
2260
2261 static int reiserfs_release_dquot(struct dquot *dquot)
2262 {
2263         struct reiserfs_transaction_handle th;
2264         int ret, err;
2265
2266         reiserfs_write_lock(dquot->dq_sb);
2267         ret =
2268             journal_begin(&th, dquot->dq_sb,
2269                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2270         reiserfs_write_unlock(dquot->dq_sb);
2271         if (ret) {
2272                 /* Release dquot anyway to avoid endless cycle in dqput() */
2273                 dquot_release(dquot);
2274                 goto out;
2275         }
2276         ret = dquot_release(dquot);
2277         reiserfs_write_lock(dquot->dq_sb);
2278         err = journal_end(&th);
2279         if (!ret && err)
2280                 ret = err;
2281         reiserfs_write_unlock(dquot->dq_sb);
2282 out:
2283         return ret;
2284 }
2285
2286 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2287 {
2288         /* Are we journaling quotas? */
2289         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2290             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2291                 dquot_mark_dquot_dirty(dquot);
2292                 return reiserfs_write_dquot(dquot);
2293         } else
2294                 return dquot_mark_dquot_dirty(dquot);
2295 }
2296
2297 static int reiserfs_write_info(struct super_block *sb, int type)
2298 {
2299         struct reiserfs_transaction_handle th;
2300         int ret, err;
2301         int depth;
2302
2303         /* Data block + inode block */
2304         reiserfs_write_lock(sb);
2305         ret = journal_begin(&th, sb, 2);
2306         if (ret)
2307                 goto out;
2308         depth = reiserfs_write_unlock_nested(sb);
2309         ret = dquot_commit_info(sb, type);
2310         reiserfs_write_lock_nested(sb, depth);
2311         err = journal_end(&th);
2312         if (!ret && err)
2313                 ret = err;
2314 out:
2315         reiserfs_write_unlock(sb);
2316         return ret;
2317 }
2318
2319 /*
2320  * Turn on quotas during mount time - we need to find the quota file and such...
2321  */
2322 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2323 {
2324         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2325                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2326 }
2327
2328 /*
2329  * Standard function to be called on quota_on
2330  */
2331 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2332                              struct path *path)
2333 {
2334         int err;
2335         struct inode *inode;
2336         struct reiserfs_transaction_handle th;
2337         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2338
2339         reiserfs_write_lock(sb);
2340         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2341                 err = -EINVAL;
2342                 goto out;
2343         }
2344
2345         /* Quotafile not on the same filesystem? */
2346         if (path->dentry->d_sb != sb) {
2347                 err = -EXDEV;
2348                 goto out;
2349         }
2350         inode = d_inode(path->dentry);
2351         /*
2352          * We must not pack tails for quota files on reiserfs for quota
2353          * IO to work
2354          */
2355         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2356                 err = reiserfs_unpack(inode, NULL);
2357                 if (err) {
2358                         reiserfs_warning(sb, "super-6520",
2359                                 "Unpacking tail of quota file failed"
2360                                 " (%d). Cannot turn on quotas.", err);
2361                         err = -EINVAL;
2362                         goto out;
2363                 }
2364                 mark_inode_dirty(inode);
2365         }
2366         /* Journaling quota? */
2367         if (REISERFS_SB(sb)->s_qf_names[type]) {
2368                 /* Quotafile not of fs root? */
2369                 if (path->dentry->d_parent != sb->s_root)
2370                         reiserfs_warning(sb, "super-6521",
2371                                  "Quota file not on filesystem root. "
2372                                  "Journalled quota will not work.");
2373         }
2374
2375         /*
2376          * When we journal data on quota file, we have to flush journal to see
2377          * all updates to the file when we bypass pagecache...
2378          */
2379         if (reiserfs_file_data_log(inode)) {
2380                 /* Just start temporary transaction and finish it */
2381                 err = journal_begin(&th, sb, 1);
2382                 if (err)
2383                         goto out;
2384                 err = journal_end_sync(&th);
2385                 if (err)
2386                         goto out;
2387         }
2388         reiserfs_write_unlock(sb);
2389         return dquot_quota_on(sb, type, format_id, path);
2390 out:
2391         reiserfs_write_unlock(sb);
2392         return err;
2393 }
2394
2395 /*
2396  * Read data from quotafile - avoid pagecache and such because we cannot afford
2397  * acquiring the locks... As quota files are never truncated and quota code
2398  * itself serializes the operations (and no one else should touch the files)
2399  * we don't have to be afraid of races
2400  */
2401 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2402                                    size_t len, loff_t off)
2403 {
2404         struct inode *inode = sb_dqopt(sb)->files[type];
2405         unsigned long blk = off >> sb->s_blocksize_bits;
2406         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2407         size_t toread;
2408         struct buffer_head tmp_bh, *bh;
2409         loff_t i_size = i_size_read(inode);
2410
2411         if (off > i_size)
2412                 return 0;
2413         if (off + len > i_size)
2414                 len = i_size - off;
2415         toread = len;
2416         while (toread > 0) {
2417                 tocopy =
2418                     sb->s_blocksize - offset <
2419                     toread ? sb->s_blocksize - offset : toread;
2420                 tmp_bh.b_state = 0;
2421                 /*
2422                  * Quota files are without tails so we can safely
2423                  * use this function
2424                  */
2425                 reiserfs_write_lock(sb);
2426                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2427                 reiserfs_write_unlock(sb);
2428                 if (err)
2429                         return err;
2430                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2431                         memset(data, 0, tocopy);
2432                 else {
2433                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2434                         if (!bh)
2435                                 return -EIO;
2436                         memcpy(data, bh->b_data + offset, tocopy);
2437                         brelse(bh);
2438                 }
2439                 offset = 0;
2440                 toread -= tocopy;
2441                 data += tocopy;
2442                 blk++;
2443         }
2444         return len;
2445 }
2446
2447 /*
2448  * Write to quotafile (we know the transaction is already started and has
2449  * enough credits)
2450  */
2451 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2452                                     const char *data, size_t len, loff_t off)
2453 {
2454         struct inode *inode = sb_dqopt(sb)->files[type];
2455         unsigned long blk = off >> sb->s_blocksize_bits;
2456         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2457         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2458         size_t towrite = len;
2459         struct buffer_head tmp_bh, *bh;
2460
2461         if (!current->journal_info) {
2462                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2463                         (unsigned long long)off, (unsigned long long)len);
2464                 return -EIO;
2465         }
2466         while (towrite > 0) {
2467                 tocopy = sb->s_blocksize - offset < towrite ?
2468                     sb->s_blocksize - offset : towrite;
2469                 tmp_bh.b_state = 0;
2470                 reiserfs_write_lock(sb);
2471                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2472                 reiserfs_write_unlock(sb);
2473                 if (err)
2474                         goto out;
2475                 if (offset || tocopy != sb->s_blocksize)
2476                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2477                 else
2478                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2479                 if (!bh) {
2480                         err = -EIO;
2481                         goto out;
2482                 }
2483                 lock_buffer(bh);
2484                 memcpy(bh->b_data + offset, data, tocopy);
2485                 flush_dcache_page(bh->b_page);
2486                 set_buffer_uptodate(bh);
2487                 unlock_buffer(bh);
2488                 reiserfs_write_lock(sb);
2489                 reiserfs_prepare_for_journal(sb, bh, 1);
2490                 journal_mark_dirty(current->journal_info, bh);
2491                 if (!journal_quota)
2492                         reiserfs_add_ordered_list(inode, bh);
2493                 reiserfs_write_unlock(sb);
2494                 brelse(bh);
2495                 offset = 0;
2496                 towrite -= tocopy;
2497                 data += tocopy;
2498                 blk++;
2499         }
2500 out:
2501         if (len == towrite)
2502                 return err;
2503         if (inode->i_size < off + len - towrite)
2504                 i_size_write(inode, off + len - towrite);
2505         inode->i_version++;
2506         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2507         mark_inode_dirty(inode);
2508         return len - towrite;
2509 }
2510
2511 #endif
2512
2513 static struct dentry *get_super_block(struct file_system_type *fs_type,
2514                            int flags, const char *dev_name,
2515                            void *data)
2516 {
2517         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2518 }
2519
2520 static int __init init_reiserfs_fs(void)
2521 {
2522         int ret;
2523
2524         ret = init_inodecache();
2525         if (ret)
2526                 return ret;
2527
2528         reiserfs_proc_info_global_init();
2529
2530         ret = register_filesystem(&reiserfs_fs_type);
2531         if (ret)
2532                 goto out;
2533
2534         return 0;
2535 out:
2536         reiserfs_proc_info_global_done();
2537         destroy_inodecache();
2538
2539         return ret;
2540 }
2541
2542 static void __exit exit_reiserfs_fs(void)
2543 {
2544         reiserfs_proc_info_global_done();
2545         unregister_filesystem(&reiserfs_fs_type);
2546         destroy_inodecache();
2547 }
2548
2549 struct file_system_type reiserfs_fs_type = {
2550         .owner = THIS_MODULE,
2551         .name = "reiserfs",
2552         .mount = get_super_block,
2553         .kill_sb = reiserfs_kill_sb,
2554         .fs_flags = FS_REQUIRES_DEV,
2555 };
2556 MODULE_ALIAS_FS("reiserfs");
2557
2558 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2559 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2560 MODULE_LICENSE("GPL");
2561
2562 module_init(init_reiserfs_fs);
2563 module_exit(exit_reiserfs_fs);