fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <linux/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/backing-dev.h>
  25 #include <linux/buffer_head.h>
  26 #include <linux/exportfs.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/vfs.h>
  29 #include <linux/mount.h>
  30 #include <linux/namei.h>
  31 #include <linux/crc32.h>
  32 #include <linux/seq_file.h>
  33
  34 struct file_system_type reiserfs_fs_type;
  35
  36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  39
  40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  41 {
  42         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  43                         strlen(reiserfs_3_5_magic_string));
  44 }
  45
  46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  47 {
  48         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  49                         strlen(reiserfs_3_6_magic_string));
  50 }
  51
  52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  53 {
  54         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  55                         strlen(reiserfs_jr_magic_string));
  56 }
  57
  58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  59 {
  60         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  61                 is_reiserfs_jr(rs));
  62 }
  63
  64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         sbi->work_queued = 0;
  94         spin_unlock(&sbi->old_work_lock);
  95
  96         reiserfs_sync_fs(s, 1);
  97 }
  98
  99 void reiserfs_schedule_old_flush(struct super_block *s)
 100 {
 101         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 102         unsigned long delay;
 103
 104         /*
 105          * Avoid scheduling flush when sb is being shut down. It can race
 106          * with journal shutdown and free still queued delayed work.
 107          */
 108         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 109                 return;
 110
 111         spin_lock(&sbi->old_work_lock);
 112         if (!sbi->work_queued) {
 113                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 114                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 115                 sbi->work_queued = 1;
 116         }
 117         spin_unlock(&sbi->old_work_lock);
 118 }
 119
 120 static void cancel_old_flush(struct super_block *s)
 121 {
 122         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 123
 124         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 125         spin_lock(&sbi->old_work_lock);
 126         sbi->work_queued = 0;
 127         spin_unlock(&sbi->old_work_lock);
 128 }
 129
 130 static int reiserfs_freeze(struct super_block *s)
 131 {
 132         struct reiserfs_transaction_handle th;
 133
 134         cancel_old_flush(s);
 135
 136         reiserfs_write_lock(s);
 137         if (!(s->s_flags & MS_RDONLY)) {
 138                 int err = journal_begin(&th, s, 1);
 139                 if (err) {
 140                         reiserfs_block_writes(&th);
 141                 } else {
 142                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 143                                                      1);
 144                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 145                         reiserfs_block_writes(&th);
 146                         journal_end_sync(&th);
 147                 }
 148         }
 149         reiserfs_write_unlock(s);
 150         return 0;
 151 }
 152
 153 static int reiserfs_unfreeze(struct super_block *s)
 154 {
 155         reiserfs_allow_writes(s);
 156         return 0;
 157 }
 158
 159 extern const struct in_core_key MAX_IN_CORE_KEY;
 160
 161 /*
 162  * this is used to delete "save link" when there are no items of a
 163  * file it points to. It can either happen if unlink is completed but
 164  * "save unlink" removal, or if file has both unlink and truncate
 165  * pending and as unlink completes first (because key of "save link"
 166  * protecting unlink is bigger that a key lf "save link" which
 167  * protects truncate), so there left no items to make truncate
 168  * completion on
 169  */
 170 static int remove_save_link_only(struct super_block *s,
 171                                  struct reiserfs_key *key, int oid_free)
 172 {
 173         struct reiserfs_transaction_handle th;
 174         int err;
 175
 176         /* we are going to do one balancing */
 177         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 178         if (err)
 179                 return err;
 180
 181         reiserfs_delete_solid_item(&th, NULL, key);
 182         if (oid_free)
 183                 /* removals are protected by direct items */
 184                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 185
 186         return journal_end(&th);
 187 }
 188
 189 #ifdef CONFIG_QUOTA
 190 static int reiserfs_quota_on_mount(struct super_block *, int);
 191 #endif
 192
 193 /* look for uncompleted unlinks and truncates and complete them */
 194 static int finish_unfinished(struct super_block *s)
 195 {
 196         INITIALIZE_PATH(path);
 197         struct cpu_key max_cpu_key, obj_key;
 198         struct reiserfs_key save_link_key, last_inode_key;
 199         int retval = 0;
 200         struct item_head *ih;
 201         struct buffer_head *bh;
 202         int item_pos;
 203         char *item;
 204         int done;
 205         struct inode *inode;
 206         int truncate;
 207 #ifdef CONFIG_QUOTA
 208         int i;
 209         int ms_active_set;
 210         int quota_enabled[REISERFS_MAXQUOTAS];
 211 #endif
 212
 213         /* compose key to look for "save" links */
 214         max_cpu_key.version = KEY_FORMAT_3_5;
 215         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 216         max_cpu_key.on_disk_key.k_objectid = ~0U;
 217         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 218         max_cpu_key.key_length = 3;
 219
 220         memset(&last_inode_key, 0, sizeof(last_inode_key));
 221
 222 #ifdef CONFIG_QUOTA
 223         /* Needed for iput() to work correctly and not trash data */
 224         if (s->s_flags & MS_ACTIVE) {
 225                 ms_active_set = 0;
 226         } else {
 227                 ms_active_set = 1;
 228                 s->s_flags |= MS_ACTIVE;
 229         }
 230         /* Turn on quotas so that they are updated correctly */
 231         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 232                 quota_enabled[i] = 1;
 233                 if (REISERFS_SB(s)->s_qf_names[i]) {
 234                         int ret;
 235
 236                         if (sb_has_quota_active(s, i)) {
 237                                 quota_enabled[i] = 0;
 238                                 continue;
 239                         }
 240                         ret = reiserfs_quota_on_mount(s, i);
 241                         if (ret < 0)
 242                                 reiserfs_warning(s, "reiserfs-2500",
 243                                                  "cannot turn on journaled "
 244                                                  "quota: error %d", ret);
 245                 }
 246         }
 247 #endif
 248
 249         done = 0;
 250         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 251         while (!retval) {
 252                 int depth;
 253                 retval = search_item(s, &max_cpu_key, &path);
 254                 if (retval != ITEM_NOT_FOUND) {
 255                         reiserfs_error(s, "vs-2140",
 256                                        "search_by_key returned %d", retval);
 257                         break;
 258                 }
 259
 260                 bh = get_last_bh(&path);
 261                 item_pos = get_item_pos(&path);
 262                 if (item_pos != B_NR_ITEMS(bh)) {
 263                         reiserfs_warning(s, "vs-2060",
 264                                          "wrong position found");
 265                         break;
 266                 }
 267                 item_pos--;
 268                 ih = item_head(bh, item_pos);
 269
 270                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 271                         /* there are no "save" links anymore */
 272                         break;
 273
 274                 save_link_key = ih->ih_key;
 275                 if (is_indirect_le_ih(ih))
 276                         truncate = 1;
 277                 else
 278                         truncate = 0;
 279
 280                 /* reiserfs_iget needs k_dirid and k_objectid only */
 281                 item = ih_item_body(bh, ih);
 282                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 283                 obj_key.on_disk_key.k_objectid =
 284                     le32_to_cpu(ih->ih_key.k_objectid);
 285                 obj_key.on_disk_key.k_offset = 0;
 286                 obj_key.on_disk_key.k_type = 0;
 287
 288                 pathrelse(&path);
 289
 290                 inode = reiserfs_iget(s, &obj_key);
 291                 if (!inode) {
 292                         /*
 293                          * the unlink almost completed, it just did not
 294                          * manage to remove "save" link and release objectid
 295                          */
 296                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 297                                          &obj_key);
 298                         retval = remove_save_link_only(s, &save_link_key, 1);
 299                         continue;
 300                 }
 301
 302                 if (!truncate && inode->i_nlink) {
 303                         /* file is not unlinked */
 304                         reiserfs_warning(s, "vs-2185",
 305                                          "file %K is not unlinked",
 306                                          &obj_key);
 307                         retval = remove_save_link_only(s, &save_link_key, 0);
 308                         continue;
 309                 }
 310                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 311                 dquot_initialize(inode);
 312                 reiserfs_write_lock_nested(inode->i_sb, depth);
 313
 314                 if (truncate && S_ISDIR(inode->i_mode)) {
 315                         /*
 316                          * We got a truncate request for a dir which
 317                          * is impossible.  The only imaginable way is to
 318                          * execute unfinished truncate request then boot
 319                          * into old kernel, remove the file and create dir
 320                          * with the same key.
 321                          */
 322                         reiserfs_warning(s, "green-2101",
 323                                          "impossible truncate on a "
 324                                          "directory %k. Please report",
 325                                          INODE_PKEY(inode));
 326                         retval = remove_save_link_only(s, &save_link_key, 0);
 327                         truncate = 0;
 328                         iput(inode);
 329                         continue;
 330                 }
 331
 332                 if (truncate) {
 333                         REISERFS_I(inode)->i_flags |=
 334                             i_link_saved_truncate_mask;
 335                         /*
 336                          * not completed truncate found. New size was
 337                          * committed together with "save" link
 338                          */
 339                         reiserfs_info(s, "Truncating %k to %lld ..",
 340                                       INODE_PKEY(inode), inode->i_size);
 341
 342                         /* don't update modification time */
 343                         reiserfs_truncate_file(inode, 0);
 344
 345                         retval = remove_save_link(inode, truncate);
 346                 } else {
 347                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 348                         /* not completed unlink (rmdir) found */
 349                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 350                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 351                                         sizeof(last_inode_key))){
 352                                 last_inode_key = *INODE_PKEY(inode);
 353                                 /* removal gets completed in iput */
 354                                 retval = 0;
 355                         } else {
 356                                 reiserfs_warning(s, "super-2189", "Dead loop "
 357                                                  "in finish_unfinished "
 358                                                  "detected, just remove "
 359                                                  "save link\n");
 360                                 retval = remove_save_link_only(s,
 361                                                         &save_link_key, 0);
 362                         }
 363                 }
 364
 365                 iput(inode);
 366                 printk("done\n");
 367                 done++;
 368         }
 369         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 370
 371 #ifdef CONFIG_QUOTA
 372         /* Turn quotas off */
 373         reiserfs_write_unlock(s);
 374         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 375                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 376                         dquot_quota_off(s, i);
 377         }
 378         reiserfs_write_lock(s);
 379         if (ms_active_set)
 380                 /* Restore the flag back */
 381                 s->s_flags &= ~MS_ACTIVE;
 382 #endif
 383         pathrelse(&path);
 384         if (done)
 385                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 386                               "Completed\n", done);
 387         return retval;
 388 }
 389
 390 /*
 391  * to protect file being unlinked from getting lost we "safe" link files
 392  * being unlinked. This link will be deleted in the same transaction with last
 393  * item of file. mounting the filesystem we scan all these links and remove
 394  * files which almost got lost
 395  */
 396 void add_save_link(struct reiserfs_transaction_handle *th,
 397                    struct inode *inode, int truncate)
 398 {
 399         INITIALIZE_PATH(path);
 400         int retval;
 401         struct cpu_key key;
 402         struct item_head ih;
 403         __le32 link;
 404
 405         BUG_ON(!th->t_trans_id);
 406
 407         /* file can only get one "save link" of each kind */
 408         RFALSE(truncate &&
 409                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 410                "saved link already exists for truncated inode %lx",
 411                (long)inode->i_ino);
 412         RFALSE(!truncate &&
 413                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 414                "saved link already exists for unlinked inode %lx",
 415                (long)inode->i_ino);
 416
 417         /* setup key of "save" link */
 418         key.version = KEY_FORMAT_3_5;
 419         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 420         key.on_disk_key.k_objectid = inode->i_ino;
 421         if (!truncate) {
 422                 /* unlink, rmdir, rename */
 423                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 424                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 425
 426                 /* item head of "safe" link */
 427                 make_le_item_head(&ih, &key, key.version,
 428                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 429                                   4 /*length */ , 0xffff /*free space */ );
 430         } else {
 431                 /* truncate */
 432                 if (S_ISDIR(inode->i_mode))
 433                         reiserfs_warning(inode->i_sb, "green-2102",
 434                                          "Adding a truncate savelink for "
 435                                          "a directory %k! Please report",
 436                                          INODE_PKEY(inode));
 437                 set_cpu_key_k_offset(&key, 1);
 438                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 439
 440                 /* item head of "safe" link */
 441                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 442                                   4 /*length */ , 0 /*free space */ );
 443         }
 444         key.key_length = 3;
 445
 446         /* look for its place in the tree */
 447         retval = search_item(inode->i_sb, &key, &path);
 448         if (retval != ITEM_NOT_FOUND) {
 449                 if (retval != -ENOSPC)
 450                         reiserfs_error(inode->i_sb, "vs-2100",
 451                                        "search_by_key (%K) returned %d", &key,
 452                                        retval);
 453                 pathrelse(&path);
 454                 return;
 455         }
 456
 457         /* body of "save" link */
 458         link = INODE_PKEY(inode)->k_dir_id;
 459
 460         /* put "save" link into tree, don't charge quota to anyone */
 461         retval =
 462             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 463         if (retval) {
 464                 if (retval != -ENOSPC)
 465                         reiserfs_error(inode->i_sb, "vs-2120",
 466                                        "insert_item returned %d", retval);
 467         } else {
 468                 if (truncate)
 469                         REISERFS_I(inode)->i_flags |=
 470                             i_link_saved_truncate_mask;
 471                 else
 472                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 473         }
 474 }
 475
 476 /* this opens transaction unlike add_save_link */
 477 int remove_save_link(struct inode *inode, int truncate)
 478 {
 479         struct reiserfs_transaction_handle th;
 480         struct reiserfs_key key;
 481         int err;
 482
 483         /* we are going to do one balancing only */
 484         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 485         if (err)
 486                 return err;
 487
 488         /* setup key of "save" link */
 489         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 490         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 491         if (!truncate) {
 492                 /* unlink, rmdir, rename */
 493                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 494                                     1 + inode->i_sb->s_blocksize);
 495                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 496         } else {
 497                 /* truncate */
 498                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 499                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 500         }
 501
 502         if ((truncate &&
 503              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 504             (!truncate &&
 505              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 506                 /* don't take quota bytes from anywhere */
 507                 reiserfs_delete_solid_item(&th, NULL, &key);
 508         if (!truncate) {
 509                 reiserfs_release_objectid(&th, inode->i_ino);
 510                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 511         } else
 512                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 513
 514         return journal_end(&th);
 515 }
 516
 517 static void reiserfs_kill_sb(struct super_block *s)
 518 {
 519         if (REISERFS_SB(s)) {
 520                 reiserfs_proc_info_done(s);
 521                 /*
 522                  * Force any pending inode evictions to occur now. Any
 523                  * inodes to be removed that have extended attributes
 524                  * associated with them need to clean them up before
 525                  * we can release the extended attribute root dentries.
 526                  * shrink_dcache_for_umount will BUG if we don't release
 527                  * those before it's called so ->put_super is too late.
 528                  */
 529                 shrink_dcache_sb(s);
 530
 531                 dput(REISERFS_SB(s)->xattr_root);
 532                 REISERFS_SB(s)->xattr_root = NULL;
 533                 dput(REISERFS_SB(s)->priv_root);
 534                 REISERFS_SB(s)->priv_root = NULL;
 535         }
 536
 537         kill_block_super(s);
 538 }
 539
 540 static void reiserfs_put_super(struct super_block *s)
 541 {
 542         struct reiserfs_transaction_handle th;
 543         th.t_trans_id = 0;
 544
 545         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 546
 547         reiserfs_write_lock(s);
 548
 549         /*
 550          * change file system state to current state if it was mounted
 551          * with read-write permissions
 552          */
 553         if (!(s->s_flags & MS_RDONLY)) {
 554                 if (!journal_begin(&th, s, 10)) {
 555                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 556                                                      1);
 557                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 558                                             REISERFS_SB(s)->s_mount_state);
 559                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 560                 }
 561         }
 562
 563         /*
 564          * note, journal_release checks for readonly mount, and can
 565          * decide not to do a journal_end
 566          */
 567         journal_release(&th, s);
 568
 569         reiserfs_free_bitmap_cache(s);
 570
 571         brelse(SB_BUFFER_WITH_SB(s));
 572
 573         print_statistics(s);
 574
 575         if (REISERFS_SB(s)->reserved_blocks != 0) {
 576                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 577                                  REISERFS_SB(s)->reserved_blocks);
 578         }
 579
 580         reiserfs_write_unlock(s);
 581         mutex_destroy(&REISERFS_SB(s)->lock);
 582         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 583         kfree(s->s_fs_info);
 584         s->s_fs_info = NULL;
 585 }
 586
 587 static struct kmem_cache *reiserfs_inode_cachep;
 588
 589 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 590 {
 591         struct reiserfs_inode_info *ei;
 592         ei = 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                                                       SLAB_ACCOUNT),
 631                                                   init_once);
 632         if (reiserfs_inode_cachep == NULL)
 633                 return -ENOMEM;
 634         return 0;
 635 }
 636
 637 static void destroy_inodecache(void)
 638 {
 639         /*
 640          * Make sure all delayed rcu free inodes are flushed before we
 641          * destroy cache.
 642          */
 643         rcu_barrier();
 644         kmem_cache_destroy(reiserfs_inode_cachep);
 645 }
 646
 647 /* we don't mark inodes dirty, we just log them */
 648 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 649 {
 650         struct reiserfs_transaction_handle th;
 651
 652         int err = 0;
 653
 654         if (inode->i_sb->s_flags & MS_RDONLY) {
 655                 reiserfs_warning(inode->i_sb, "clm-6006",
 656                                  "writing inode %lu on readonly FS",
 657                                  inode->i_ino);
 658                 return;
 659         }
 660         reiserfs_write_lock(inode->i_sb);
 661
 662         /*
 663          * this is really only used for atime updates, so they don't have
 664          * to be included in O_SYNC or fsync
 665          */
 666         err = journal_begin(&th, inode->i_sb, 1);
 667         if (err)
 668                 goto out;
 669
 670         reiserfs_update_sd(&th, inode);
 671         journal_end(&th);
 672
 673 out:
 674         reiserfs_write_unlock(inode->i_sb);
 675 }
 676
 677 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 678 {
 679         struct super_block *s = root->d_sb;
 680         struct reiserfs_journal *journal = SB_JOURNAL(s);
 681         long opts = REISERFS_SB(s)->s_mount_opt;
 682
 683         if (opts & (1 << REISERFS_LARGETAIL))
 684                 seq_puts(seq, ",tails=on");
 685         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 686                 seq_puts(seq, ",notail");
 687         /* tails=small is default so we don't show it */
 688
 689         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 690                 seq_puts(seq, ",barrier=none");
 691         /* barrier=flush is default so we don't show it */
 692
 693         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 694                 seq_puts(seq, ",errors=continue");
 695         else if (opts & (1 << REISERFS_ERROR_PANIC))
 696                 seq_puts(seq, ",errors=panic");
 697         /* errors=ro is default so we don't show it */
 698
 699         if (opts & (1 << REISERFS_DATA_LOG))
 700                 seq_puts(seq, ",data=journal");
 701         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 702                 seq_puts(seq, ",data=writeback");
 703         /* data=ordered is default so we don't show it */
 704
 705         if (opts & (1 << REISERFS_ATTRS))
 706                 seq_puts(seq, ",attrs");
 707
 708         if (opts & (1 << REISERFS_XATTRS_USER))
 709                 seq_puts(seq, ",user_xattr");
 710
 711         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 712                 seq_puts(seq, ",expose_privroot");
 713
 714         if (opts & (1 << REISERFS_POSIXACL))
 715                 seq_puts(seq, ",acl");
 716
 717         if (REISERFS_SB(s)->s_jdev)
 718                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 719
 720         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 721                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 722
 723 #ifdef CONFIG_QUOTA
 724         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 725                 seq_show_option(seq, "usrjquota",
 726                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 727         else if (opts & (1 << REISERFS_USRQUOTA))
 728                 seq_puts(seq, ",usrquota");
 729         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 730                 seq_show_option(seq, "grpjquota",
 731                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 732         else if (opts & (1 << REISERFS_GRPQUOTA))
 733                 seq_puts(seq, ",grpquota");
 734         if (REISERFS_SB(s)->s_jquota_fmt) {
 735                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 736                         seq_puts(seq, ",jqfmt=vfsold");
 737                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 738                         seq_puts(seq, ",jqfmt=vfsv0");
 739         }
 740 #endif
 741
 742         /* Block allocator options */
 743         if (opts & (1 << REISERFS_NO_BORDER))
 744                 seq_puts(seq, ",block-allocator=noborder");
 745         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 746                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 747         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 748                 seq_puts(seq, ",block-allocator=hashed_relocation");
 749         if (opts & (1 << REISERFS_TEST4))
 750                 seq_puts(seq, ",block-allocator=test4");
 751         show_alloc_options(seq, s);
 752         return 0;
 753 }
 754
 755 #ifdef CONFIG_QUOTA
 756 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 757                                     size_t, loff_t);
 758 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 759                                    loff_t);
 760
 761 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 762 {
 763         return REISERFS_I(inode)->i_dquot;
 764 }
 765 #endif
 766
 767 static const struct super_operations reiserfs_sops = {
 768         .alloc_inode = reiserfs_alloc_inode,
 769         .destroy_inode = reiserfs_destroy_inode,
 770         .write_inode = reiserfs_write_inode,
 771         .dirty_inode = reiserfs_dirty_inode,
 772         .evict_inode = reiserfs_evict_inode,
 773         .put_super = reiserfs_put_super,
 774         .sync_fs = reiserfs_sync_fs,
 775         .freeze_fs = reiserfs_freeze,
 776         .unfreeze_fs = reiserfs_unfreeze,
 777         .statfs = reiserfs_statfs,
 778         .remount_fs = reiserfs_remount,
 779         .show_options = reiserfs_show_options,
 780 #ifdef CONFIG_QUOTA
 781         .quota_read = reiserfs_quota_read,
 782         .quota_write = reiserfs_quota_write,
 783         .get_dquots = reiserfs_get_dquots,
 784 #endif
 785 };
 786
 787 #ifdef CONFIG_QUOTA
 788 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 789
 790 static int reiserfs_write_dquot(struct dquot *);
 791 static int reiserfs_acquire_dquot(struct dquot *);
 792 static int reiserfs_release_dquot(struct dquot *);
 793 static int reiserfs_mark_dquot_dirty(struct dquot *);
 794 static int reiserfs_write_info(struct super_block *, int);
 795 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 796
 797 static const struct dquot_operations reiserfs_quota_operations = {
 798         .write_dquot = reiserfs_write_dquot,
 799         .acquire_dquot = reiserfs_acquire_dquot,
 800         .release_dquot = reiserfs_release_dquot,
 801         .mark_dirty = reiserfs_mark_dquot_dirty,
 802         .write_info = reiserfs_write_info,
 803         .alloc_dquot    = dquot_alloc,
 804         .destroy_dquot  = dquot_destroy,
 805 };
 806
 807 static const struct quotactl_ops reiserfs_qctl_operations = {
 808         .quota_on = reiserfs_quota_on,
 809         .quota_off = dquot_quota_off,
 810         .quota_sync = dquot_quota_sync,
 811         .get_state = dquot_get_state,
 812         .set_info = dquot_set_dqinfo,
 813         .get_dqblk = dquot_get_dqblk,
 814         .set_dqblk = dquot_set_dqblk,
 815 };
 816 #endif
 817
 818 static const struct export_operations reiserfs_export_ops = {
 819         .encode_fh = reiserfs_encode_fh,
 820         .fh_to_dentry = reiserfs_fh_to_dentry,
 821         .fh_to_parent = reiserfs_fh_to_parent,
 822         .get_parent = reiserfs_get_parent,
 823 };
 824
 825 /*
 826  * this struct is used in reiserfs_getopt () for containing the value for
 827  * those mount options that have values rather than being toggles.
 828  */
 829 typedef struct {
 830         char *value;
 831         /*
 832          * bitmask which is to set on mount_options bitmask
 833          * when this value is found, 0 is no bits are to be changed.
 834          */
 835         int setmask;
 836         /*
 837          * bitmask which is to clear on mount_options bitmask
 838          * when this value is found, 0 is no bits are to be changed.
 839          * This is applied BEFORE setmask
 840          */
 841         int clrmask;
 842 } arg_desc_t;
 843
 844 /* Set this bit in arg_required to allow empty arguments */
 845 #define REISERFS_OPT_ALLOWEMPTY 31
 846
 847 /*
 848  * this struct is used in reiserfs_getopt() for describing the
 849  * set of reiserfs mount options
 850  */
 851 typedef struct {
 852         char *option_name;
 853
 854         /* 0 if argument is not required, not 0 otherwise */
 855         int arg_required;
 856
 857         /* list of values accepted by an option */
 858         const arg_desc_t *values;
 859
 860         /*
 861          * bitmask which is to set on mount_options bitmask
 862          * when this value is found, 0 is no bits are to be changed.
 863          */
 864         int setmask;
 865
 866         /*
 867          * bitmask which is to clear on mount_options bitmask
 868          * when this value is found, 0 is no bits are to be changed.
 869          * This is applied BEFORE setmask
 870          */
 871         int clrmask;
 872 } opt_desc_t;
 873
 874 /* possible values for -o data= */
 875 static const arg_desc_t logging_mode[] = {
 876         {"ordered", 1 << REISERFS_DATA_ORDERED,
 877          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 878         {"journal", 1 << REISERFS_DATA_LOG,
 879          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 880         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 881          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 882         {.value = NULL}
 883 };
 884
 885 /* possible values for -o barrier= */
 886 static const arg_desc_t barrier_mode[] = {
 887         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 888         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 889         {.value = NULL}
 890 };
 891
 892 /*
 893  * possible values for "-o block-allocator=" and bits which are to be set in
 894  * s_mount_opt of reiserfs specific part of in-core super block
 895  */
 896 static const arg_desc_t balloc[] = {
 897         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 898         {"border", 0, 1 << REISERFS_NO_BORDER},
 899         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 900         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 901         {"test4", 1 << REISERFS_TEST4, 0},
 902         {"notest4", 0, 1 << REISERFS_TEST4},
 903         {NULL, 0, 0}
 904 };
 905
 906 static const arg_desc_t tails[] = {
 907         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 908         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 909         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 910         {NULL, 0, 0}
 911 };
 912
 913 static const arg_desc_t error_actions[] = {
 914         {"panic", 1 << REISERFS_ERROR_PANIC,
 915          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 916         {"ro-remount", 1 << REISERFS_ERROR_RO,
 917          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 918 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 919         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 920          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 921 #endif
 922         {NULL, 0, 0},
 923 };
 924
 925 /*
 926  * proceed only one option from a list *cur - string containing of mount
 927  * options
 928  * opts - array of options which are accepted
 929  * opt_arg - if option is found and requires an argument and if it is specifed
 930  * in the input - pointer to the argument is stored here
 931  * bit_flags - if option requires to set a certain bit - it is set here
 932  * return -1 if unknown option is found, opt->arg_required otherwise
 933  */
 934 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 935                            char **opt_arg, unsigned long *bit_flags)
 936 {
 937         char *p;
 938         /*
 939          * foo=bar,
 940          * ^   ^  ^
 941          * |   |  +-- option_end
 942          * |   +-- arg_start
 943          * +-- option_start
 944          */
 945         const opt_desc_t *opt;
 946         const arg_desc_t *arg;
 947
 948         p = *cur;
 949
 950         /* assume argument cannot contain commas */
 951         *cur = strchr(p, ',');
 952         if (*cur) {
 953                 *(*cur) = '\0';
 954                 (*cur)++;
 955         }
 956
 957         if (!strncmp(p, "alloc=", 6)) {
 958                 /*
 959                  * Ugly special case, probably we should redo options
 960                  * parser so that it can understand several arguments for
 961                  * some options, also so that it can fill several bitfields
 962                  * with option values.
 963                  */
 964                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 965                         return -1;
 966                 } else {
 967                         return 0;
 968                 }
 969         }
 970
 971         /* for every option in the list */
 972         for (opt = opts; opt->option_name; opt++) {
 973                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 974                         if (bit_flags) {
 975                                 if (opt->clrmask ==
 976                                     (1 << REISERFS_UNSUPPORTED_OPT))
 977                                         reiserfs_warning(s, "super-6500",
 978                                                          "%s not supported.\n",
 979                                                          p);
 980                                 else
 981                                         *bit_flags &= ~opt->clrmask;
 982                                 if (opt->setmask ==
 983                                     (1 << REISERFS_UNSUPPORTED_OPT))
 984                                         reiserfs_warning(s, "super-6501",
 985                                                          "%s not supported.\n",
 986                                                          p);
 987                                 else
 988                                         *bit_flags |= opt->setmask;
 989                         }
 990                         break;
 991                 }
 992         }
 993         if (!opt->option_name) {
 994                 reiserfs_warning(s, "super-6502",
 995                                  "unknown mount option \"%s\"", p);
 996                 return -1;
 997         }
 998
 999         p += strlen(opt->option_name);
1000         switch (*p) {
1001         case '=':
1002                 if (!opt->arg_required) {
1003                         reiserfs_warning(s, "super-6503",
1004                                          "the option \"%s\" does not "
1005                                          "require an argument\n",
1006                                          opt->option_name);
1007                         return -1;
1008                 }
1009                 break;
1010
1011         case 0:
1012                 if (opt->arg_required) {
1013                         reiserfs_warning(s, "super-6504",
1014                                          "the option \"%s\" requires an "
1015                                          "argument\n", opt->option_name);
1016                         return -1;
1017                 }
1018                 break;
1019         default:
1020                 reiserfs_warning(s, "super-6505",
1021                                  "head of option \"%s\" is only correct\n",
1022                                  opt->option_name);
1023                 return -1;
1024         }
1025
1026         /*
1027          * move to the argument, or to next option if argument is not
1028          * required
1029          */
1030         p++;
1031
1032         if (opt->arg_required
1033             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1034             && !strlen(p)) {
1035                 /* this catches "option=," if not allowed */
1036                 reiserfs_warning(s, "super-6506",
1037                                  "empty argument for \"%s\"\n",
1038                                  opt->option_name);
1039                 return -1;
1040         }
1041
1042         if (!opt->values) {
1043                 /* *=NULLopt_arg contains pointer to argument */
1044                 *opt_arg = p;
1045                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1046         }
1047
1048         /* values possible for this option are listed in opt->values */
1049         for (arg = opt->values; arg->value; arg++) {
1050                 if (!strcmp(p, arg->value)) {
1051                         if (bit_flags) {
1052                                 *bit_flags &= ~arg->clrmask;
1053                                 *bit_flags |= arg->setmask;
1054                         }
1055                         return opt->arg_required;
1056                 }
1057         }
1058
1059         reiserfs_warning(s, "super-6506",
1060                          "bad value \"%s\" for option \"%s\"\n", p,
1061                          opt->option_name);
1062         return -1;
1063 }
1064
1065 /* returns 0 if something is wrong in option string, 1 - otherwise */
1066 static int reiserfs_parse_options(struct super_block *s,
1067
1068                                   /* string given via mount's -o */
1069                                   char *options,
1070
1071                                   /*
1072                                    * after the parsing phase, contains the
1073                                    * collection of bitflags defining what
1074                                    * mount options were selected.
1075                                    */
1076                                   unsigned long *mount_options,
1077
1078                                   /* strtol-ed from NNN of resize=NNN */
1079                                   unsigned long *blocks,
1080                                   char **jdev_name,
1081                                   unsigned int *commit_max_age,
1082                                   char **qf_names,
1083                                   unsigned int *qfmt)
1084 {
1085         int c;
1086         char *arg = NULL;
1087         char *pos;
1088         opt_desc_t opts[] = {
1089                 /*
1090                  * Compatibility stuff, so that -o notail for old
1091                  * setups still work
1092                  */
1093                 {"tails",.arg_required = 't',.values = tails},
1094                 {"notail",.clrmask =
1095                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1096                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1097                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1098                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1099                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1100 #ifdef CONFIG_REISERFS_FS_XATTR
1101                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1102                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1103 #else
1104                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1105                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1106 #endif
1107 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1108                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1109                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1110 #else
1111                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1112                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1113 #endif
1114                 {.option_name = "nolog"},
1115                 {"replayonly",.setmask = 1 << REPLAYONLY},
1116                 {"block-allocator",.arg_required = 'a',.values = balloc},
1117                 {"data",.arg_required = 'd',.values = logging_mode},
1118                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1119                 {"resize",.arg_required = 'r',.values = NULL},
1120                 {"jdev",.arg_required = 'j',.values = NULL},
1121                 {"nolargeio",.arg_required = 'w',.values = NULL},
1122                 {"commit",.arg_required = 'c',.values = NULL},
1123                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1124                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1125                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1126                 {"errors",.arg_required = 'e',.values = error_actions},
1127                 {"usrjquota",.arg_required =
1128                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1129                 {"grpjquota",.arg_required =
1130                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1131                 {"jqfmt",.arg_required = 'f',.values = NULL},
1132                 {.option_name = NULL}
1133         };
1134
1135         *blocks = 0;
1136         if (!options || !*options)
1137                 /*
1138                  * use default configuration: create tails, journaling on, no
1139                  * conversion to newest format
1140                  */
1141                 return 1;
1142
1143         for (pos = options; pos;) {
1144                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1145                 if (c == -1)
1146                         /* wrong option is given */
1147                         return 0;
1148
1149                 if (c == 'r') {
1150                         char *p;
1151
1152                         p = NULL;
1153                         /* "resize=NNN" or "resize=auto" */
1154
1155                         if (!strcmp(arg, "auto")) {
1156                                 /* From JFS code, to auto-get the size. */
1157                                 *blocks =
1158                                     s->s_bdev->bd_inode->i_size >> s->
1159                                     s_blocksize_bits;
1160                         } else {
1161                                 *blocks = simple_strtoul(arg, &p, 0);
1162                                 if (*p != '\0') {
1163                                         /* NNN does not look like a number */
1164                                         reiserfs_warning(s, "super-6507",
1165                                                          "bad value %s for "
1166                                                          "-oresize\n", arg);
1167                                         return 0;
1168                                 }
1169                         }
1170                 }
1171
1172                 if (c == 'c') {
1173                         char *p = NULL;
1174                         unsigned long val = simple_strtoul(arg, &p, 0);
1175                         /* commit=NNN (time in seconds) */
1176                         if (*p != '\0' || val >= (unsigned int)-1) {
1177                                 reiserfs_warning(s, "super-6508",
1178                                                  "bad value %s for -ocommit\n",
1179                                                  arg);
1180                                 return 0;
1181                         }
1182                         *commit_max_age = (unsigned int)val;
1183                 }
1184
1185                 if (c == 'w') {
1186                         reiserfs_warning(s, "super-6509", "nolargeio option "
1187                                          "is no longer supported");
1188                         return 0;
1189                 }
1190
1191                 if (c == 'j') {
1192                         if (arg && *arg && jdev_name) {
1193                                 /* Hm, already assigned? */
1194                                 if (*jdev_name) {
1195                                         reiserfs_warning(s, "super-6510",
1196                                                          "journal device was "
1197                                                          "already specified to "
1198                                                          "be %s", *jdev_name);
1199                                         return 0;
1200                                 }
1201                                 *jdev_name = arg;
1202                         }
1203                 }
1204 #ifdef CONFIG_QUOTA
1205                 if (c == 'u' || c == 'g') {
1206                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1207
1208                         if (sb_any_quota_loaded(s) &&
1209                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1210                                 reiserfs_warning(s, "super-6511",
1211                                                  "cannot change journaled "
1212                                                  "quota options when quota "
1213                                                  "turned on.");
1214                                 return 0;
1215                         }
1216                         if (*arg) {     /* Some filename specified? */
1217                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1218                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1219                                               arg)) {
1220                                         reiserfs_warning(s, "super-6512",
1221                                                          "%s quota file "
1222                                                          "already specified.",
1223                                                          QTYPE2NAME(qtype));
1224                                         return 0;
1225                                 }
1226                                 if (strchr(arg, '/')) {
1227                                         reiserfs_warning(s, "super-6513",
1228                                                          "quotafile must be "
1229                                                          "on filesystem root.");
1230                                         return 0;
1231                                 }
1232                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1233                                 if (!qf_names[qtype]) {
1234                                         reiserfs_warning(s, "reiserfs-2502",
1235                                                          "not enough memory "
1236                                                          "for storing "
1237                                                          "quotafile name.");
1238                                         return 0;
1239                                 }
1240                                 if (qtype == USRQUOTA)
1241                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1242                                 else
1243                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1244                         } else {
1245                                 if (qf_names[qtype] !=
1246                                     REISERFS_SB(s)->s_qf_names[qtype])
1247                                         kfree(qf_names[qtype]);
1248                                 qf_names[qtype] = NULL;
1249                                 if (qtype == USRQUOTA)
1250                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1251                                 else
1252                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1253                         }
1254                 }
1255                 if (c == 'f') {
1256                         if (!strcmp(arg, "vfsold"))
1257                                 *qfmt = QFMT_VFS_OLD;
1258                         else if (!strcmp(arg, "vfsv0"))
1259                                 *qfmt = QFMT_VFS_V0;
1260                         else {
1261                                 reiserfs_warning(s, "super-6514",
1262                                                  "unknown quota format "
1263                                                  "specified.");
1264                                 return 0;
1265                         }
1266                         if (sb_any_quota_loaded(s) &&
1267                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1268                                 reiserfs_warning(s, "super-6515",
1269                                                  "cannot change journaled "
1270                                                  "quota options when quota "
1271                                                  "turned on.");
1272                                 return 0;
1273                         }
1274                 }
1275 #else
1276                 if (c == 'u' || c == 'g' || c == 'f') {
1277                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1278                                          "quota options not supported.");
1279                         return 0;
1280                 }
1281 #endif
1282         }
1283
1284 #ifdef CONFIG_QUOTA
1285         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1286             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1287                 reiserfs_warning(s, "super-6515",
1288                                  "journaled quota format not specified.");
1289                 return 0;
1290         }
1291         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1292                sb_has_quota_loaded(s, USRQUOTA)) ||
1293             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1294                sb_has_quota_loaded(s, GRPQUOTA))) {
1295                 reiserfs_warning(s, "super-6516", "quota options must "
1296                                  "be present when quota is turned on.");
1297                 return 0;
1298         }
1299 #endif
1300
1301         return 1;
1302 }
1303
1304 static void switch_data_mode(struct super_block *s, unsigned long mode)
1305 {
1306         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1307                                          (1 << REISERFS_DATA_ORDERED) |
1308                                          (1 << REISERFS_DATA_WRITEBACK));
1309         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1310 }
1311
1312 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1313 {
1314         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1315                 if (!reiserfs_data_log(s)) {
1316                         switch_data_mode(s, REISERFS_DATA_LOG);
1317                         reiserfs_info(s, "switching to journaled data mode\n");
1318                 }
1319         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1320                 if (!reiserfs_data_ordered(s)) {
1321                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1322                         reiserfs_info(s, "switching to ordered data mode\n");
1323                 }
1324         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1325                 if (!reiserfs_data_writeback(s)) {
1326                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1327                         reiserfs_info(s, "switching to writeback data mode\n");
1328                 }
1329         }
1330 }
1331
1332 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1333 {
1334         int flush = (1 << REISERFS_BARRIER_FLUSH);
1335         int none = (1 << REISERFS_BARRIER_NONE);
1336         int all_barrier = flush | none;
1337
1338         if (bits & all_barrier) {
1339                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1340                 if (bits & flush) {
1341                         REISERFS_SB(s)->s_mount_opt |= flush;
1342                         printk("reiserfs: enabling write barrier flush mode\n");
1343                 } else if (bits & none) {
1344                         REISERFS_SB(s)->s_mount_opt |= none;
1345                         printk("reiserfs: write barriers turned off\n");
1346                 }
1347         }
1348 }
1349
1350 static void handle_attrs(struct super_block *s)
1351 {
1352         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1353
1354         if (reiserfs_attrs(s)) {
1355                 if (old_format_only(s)) {
1356                         reiserfs_warning(s, "super-6517", "cannot support "
1357                                          "attributes on 3.5.x disk format");
1358                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1359                         return;
1360                 }
1361                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1362                         reiserfs_warning(s, "super-6518", "cannot support "
1363                                          "attributes until flag is set in "
1364                                          "super-block");
1365                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1366                 }
1367         }
1368 }
1369
1370 #ifdef CONFIG_QUOTA
1371 static void handle_quota_files(struct super_block *s, char **qf_names,
1372                                unsigned int *qfmt)
1373 {
1374         int i;
1375
1376         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1377                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1378                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1379                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1380         }
1381         if (*qfmt)
1382                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1383 }
1384 #endif
1385
1386 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1387 {
1388         struct reiserfs_super_block *rs;
1389         struct reiserfs_transaction_handle th;
1390         unsigned long blocks;
1391         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1392         unsigned long safe_mask = 0;
1393         unsigned int commit_max_age = (unsigned int)-1;
1394         struct reiserfs_journal *journal = SB_JOURNAL(s);
1395         char *new_opts = kstrdup(arg, GFP_KERNEL);
1396         int err;
1397         char *qf_names[REISERFS_MAXQUOTAS];
1398         unsigned int qfmt = 0;
1399 #ifdef CONFIG_QUOTA
1400         int i;
1401 #endif
1402
1403         sync_filesystem(s);
1404         reiserfs_write_lock(s);
1405
1406 #ifdef CONFIG_QUOTA
1407         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1408 #endif
1409
1410         rs = SB_DISK_SUPER_BLOCK(s);
1411
1412         if (!reiserfs_parse_options
1413             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1414             qf_names, &qfmt)) {
1415 #ifdef CONFIG_QUOTA
1416                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1417                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1418                                 kfree(qf_names[i]);
1419 #endif
1420                 err = -EINVAL;
1421                 goto out_err_unlock;
1422         }
1423 #ifdef CONFIG_QUOTA
1424         handle_quota_files(s, qf_names, &qfmt);
1425 #endif
1426
1427         handle_attrs(s);
1428
1429         /* Add options that are safe here */
1430         safe_mask |= 1 << REISERFS_SMALLTAIL;
1431         safe_mask |= 1 << REISERFS_LARGETAIL;
1432         safe_mask |= 1 << REISERFS_NO_BORDER;
1433         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1434         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1435         safe_mask |= 1 << REISERFS_TEST4;
1436         safe_mask |= 1 << REISERFS_ATTRS;
1437         safe_mask |= 1 << REISERFS_XATTRS_USER;
1438         safe_mask |= 1 << REISERFS_POSIXACL;
1439         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1440         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1441         safe_mask |= 1 << REISERFS_ERROR_RO;
1442         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1443         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1444         safe_mask |= 1 << REISERFS_USRQUOTA;
1445         safe_mask |= 1 << REISERFS_GRPQUOTA;
1446
1447         /*
1448          * Update the bitmask, taking care to keep
1449          * the bits we're not allowed to change here
1450          */
1451         REISERFS_SB(s)->s_mount_opt =
1452             (REISERFS_SB(s)->
1453              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1454
1455         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1456                 journal->j_max_commit_age = commit_max_age;
1457                 journal->j_max_trans_age = commit_max_age;
1458         } else if (commit_max_age == 0) {
1459                 /* 0 means restore defaults. */
1460                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1461                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1462         }
1463
1464         if (blocks) {
1465                 err = reiserfs_resize(s, blocks);
1466                 if (err != 0)
1467                         goto out_err_unlock;
1468         }
1469
1470         if (*mount_flags & MS_RDONLY) {
1471                 reiserfs_write_unlock(s);
1472                 reiserfs_xattr_init(s, *mount_flags);
1473                 /* remount read-only */
1474                 if (s->s_flags & MS_RDONLY)
1475                         /* it is read-only already */
1476                         goto out_ok_unlocked;
1477
1478                 err = dquot_suspend(s, -1);
1479                 if (err < 0)
1480                         goto out_err;
1481
1482                 /* try to remount file system with read-only permissions */
1483                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1484                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1485                         goto out_ok_unlocked;
1486                 }
1487
1488                 reiserfs_write_lock(s);
1489
1490                 err = journal_begin(&th, s, 10);
1491                 if (err)
1492                         goto out_err_unlock;
1493
1494                 /* Mounting a rw partition read-only. */
1495                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1496                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1497                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1498         } else {
1499                 /* remount read-write */
1500                 if (!(s->s_flags & MS_RDONLY)) {
1501                         reiserfs_write_unlock(s);
1502                         reiserfs_xattr_init(s, *mount_flags);
1503                         goto out_ok_unlocked;   /* We are read-write already */
1504                 }
1505
1506                 if (reiserfs_is_journal_aborted(journal)) {
1507                         err = journal->j_errno;
1508                         goto out_err_unlock;
1509                 }
1510
1511                 handle_data_mode(s, mount_options);
1512                 handle_barrier_mode(s, mount_options);
1513                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1514
1515                 /* now it is safe to call journal_begin */
1516                 s->s_flags &= ~MS_RDONLY;
1517                 err = journal_begin(&th, s, 10);
1518                 if (err)
1519                         goto out_err_unlock;
1520
1521                 /* Mount a partition which is read-only, read-write */
1522                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1523                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1524                 s->s_flags &= ~MS_RDONLY;
1525                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1526                 if (!old_format_only(s))
1527                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1528                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1529                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1530                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1531         }
1532         /* this will force a full flush of all journal lists */
1533         SB_JOURNAL(s)->j_must_wait = 1;
1534         err = journal_end(&th);
1535         if (err)
1536                 goto out_err_unlock;
1537
1538         reiserfs_write_unlock(s);
1539         if (!(*mount_flags & MS_RDONLY)) {
1540                 dquot_resume(s, -1);
1541                 reiserfs_write_lock(s);
1542                 finish_unfinished(s);
1543                 reiserfs_write_unlock(s);
1544                 reiserfs_xattr_init(s, *mount_flags);
1545         }
1546
1547 out_ok_unlocked:
1548         replace_mount_options(s, new_opts);
1549         return 0;
1550
1551 out_err_unlock:
1552         reiserfs_write_unlock(s);
1553 out_err:
1554         kfree(new_opts);
1555         return err;
1556 }
1557
1558 static int read_super_block(struct super_block *s, int offset)
1559 {
1560         struct buffer_head *bh;
1561         struct reiserfs_super_block *rs;
1562         int fs_blocksize;
1563
1564         bh = sb_bread(s, offset / s->s_blocksize);
1565         if (!bh) {
1566                 reiserfs_warning(s, "sh-2006",
1567                                  "bread failed (dev %s, block %lu, size %lu)",
1568                                  s->s_id, offset / s->s_blocksize,
1569                                  s->s_blocksize);
1570                 return 1;
1571         }
1572
1573         rs = (struct reiserfs_super_block *)bh->b_data;
1574         if (!is_any_reiserfs_magic_string(rs)) {
1575                 brelse(bh);
1576                 return 1;
1577         }
1578         /*
1579          * ok, reiserfs signature (old or new) found in at the given offset
1580          */
1581         fs_blocksize = sb_blocksize(rs);
1582         brelse(bh);
1583         sb_set_blocksize(s, fs_blocksize);
1584
1585         bh = sb_bread(s, offset / s->s_blocksize);
1586         if (!bh) {
1587                 reiserfs_warning(s, "sh-2007",
1588                                  "bread failed (dev %s, block %lu, size %lu)",
1589                                  s->s_id, offset / s->s_blocksize,
1590                                  s->s_blocksize);
1591                 return 1;
1592         }
1593
1594         rs = (struct reiserfs_super_block *)bh->b_data;
1595         if (sb_blocksize(rs) != s->s_blocksize) {
1596                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1597                                  "filesystem on (dev %s, block %llu, size %lu)",
1598                                  s->s_id,
1599                                  (unsigned long long)bh->b_blocknr,
1600                                  s->s_blocksize);
1601                 brelse(bh);
1602                 return 1;
1603         }
1604
1605         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1606                 brelse(bh);
1607                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1608                                  "--rebuild-tree run detected. Please run\n"
1609                                  "reiserfsck --rebuild-tree and wait for a "
1610                                  "completion. If that fails\n"
1611                                  "get newer reiserfsprogs package");
1612                 return 1;
1613         }
1614
1615         SB_BUFFER_WITH_SB(s) = bh;
1616         SB_DISK_SUPER_BLOCK(s) = rs;
1617
1618         /*
1619          * magic is of non-standard journal filesystem, look at s_version to
1620          * find which format is in use
1621          */
1622         if (is_reiserfs_jr(rs)) {
1623                 if (sb_version(rs) == REISERFS_VERSION_2)
1624                         reiserfs_info(s, "found reiserfs format \"3.6\""
1625                                       " with non-standard journal\n");
1626                 else if (sb_version(rs) == REISERFS_VERSION_1)
1627                         reiserfs_info(s, "found reiserfs format \"3.5\""
1628                                       " with non-standard journal\n");
1629                 else {
1630                         reiserfs_warning(s, "sh-2012", "found unknown "
1631                                          "format \"%u\" of reiserfs with "
1632                                          "non-standard magic", sb_version(rs));
1633                         return 1;
1634                 }
1635         } else
1636                 /*
1637                  * s_version of standard format may contain incorrect
1638                  * information, so we just look at the magic string
1639                  */
1640                 reiserfs_info(s,
1641                               "found reiserfs format \"%s\" with standard journal\n",
1642                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1643
1644         s->s_op = &reiserfs_sops;
1645         s->s_export_op = &reiserfs_export_ops;
1646 #ifdef CONFIG_QUOTA
1647         s->s_qcop = &reiserfs_qctl_operations;
1648         s->dq_op = &reiserfs_quota_operations;
1649         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1650 #endif
1651
1652         /*
1653          * new format is limited by the 32 bit wide i_blocks field, want to
1654          * be one full block below that.
1655          */
1656         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1657         return 0;
1658 }
1659
1660 /* after journal replay, reread all bitmap and super blocks */
1661 static int reread_meta_blocks(struct super_block *s)
1662 {
1663         ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1664         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1665         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1666                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1667                 return 1;
1668         }
1669
1670         return 0;
1671 }
1672
1673 /* hash detection stuff */
1674
1675 /*
1676  * if root directory is empty - we set default - Yura's - hash and
1677  * warn about it
1678  * FIXME: we look for only one name in a directory. If tea and yura
1679  * both have the same value - we ask user to send report to the
1680  * mailing list
1681  */
1682 static __u32 find_hash_out(struct super_block *s)
1683 {
1684         int retval;
1685         struct inode *inode;
1686         struct cpu_key key;
1687         INITIALIZE_PATH(path);
1688         struct reiserfs_dir_entry de;
1689         struct reiserfs_de_head *deh;
1690         __u32 hash = DEFAULT_HASH;
1691         __u32 deh_hashval, teahash, r5hash, yurahash;
1692
1693         inode = d_inode(s->s_root);
1694
1695         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1696         retval = search_by_entry_key(s, &key, &path, &de);
1697         if (retval == IO_ERROR) {
1698                 pathrelse(&path);
1699                 return UNSET_HASH;
1700         }
1701         if (retval == NAME_NOT_FOUND)
1702                 de.de_entry_num--;
1703
1704         set_de_name_and_namelen(&de);
1705         deh = de.de_deh + de.de_entry_num;
1706
1707         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1708                 /* allow override in this case */
1709                 if (reiserfs_rupasov_hash(s))
1710                         hash = YURA_HASH;
1711                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1712                 goto out;
1713         }
1714
1715         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1716         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1717         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1718         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1719
1720         if ((teahash == r5hash && deh_hashval == r5hash) ||
1721             (teahash == yurahash && deh_hashval == yurahash) ||
1722             (r5hash == yurahash && deh_hashval == yurahash)) {
1723                 reiserfs_warning(s, "reiserfs-2506",
1724                                  "Unable to automatically detect hash "
1725                                  "function. Please mount with -o "
1726                                  "hash={tea,rupasov,r5}");
1727                 hash = UNSET_HASH;
1728                 goto out;
1729         }
1730
1731         if (deh_hashval == yurahash)
1732                 hash = YURA_HASH;
1733         else if (deh_hashval == teahash)
1734                 hash = TEA_HASH;
1735         else if (deh_hashval == r5hash)
1736                 hash = R5_HASH;
1737         else {
1738                 reiserfs_warning(s, "reiserfs-2506",
1739                                  "Unrecognised hash function");
1740                 hash = UNSET_HASH;
1741         }
1742 out:
1743         pathrelse(&path);
1744         return hash;
1745 }
1746
1747 /* finds out which hash names are sorted with */
1748 static int what_hash(struct super_block *s)
1749 {
1750         __u32 code;
1751
1752         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1753
1754         /*
1755          * reiserfs_hash_detect() == true if any of the hash mount options
1756          * were used.  We must check them to make sure the user isn't
1757          * using a bad hash value
1758          */
1759         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1760                 code = find_hash_out(s);
1761
1762         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1763                 /*
1764                  * detection has found the hash, and we must check against the
1765                  * mount options
1766                  */
1767                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1768                         reiserfs_warning(s, "reiserfs-2507",
1769                                          "Error, %s hash detected, "
1770                                          "unable to force rupasov hash",
1771                                          reiserfs_hashname(code));
1772                         code = UNSET_HASH;
1773                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1774                         reiserfs_warning(s, "reiserfs-2508",
1775                                          "Error, %s hash detected, "
1776                                          "unable to force tea hash",
1777                                          reiserfs_hashname(code));
1778                         code = UNSET_HASH;
1779                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1780                         reiserfs_warning(s, "reiserfs-2509",
1781                                          "Error, %s hash detected, "
1782                                          "unable to force r5 hash",
1783                                          reiserfs_hashname(code));
1784                         code = UNSET_HASH;
1785                 }
1786         } else {
1787                 /*
1788                  * find_hash_out was not called or
1789                  * could not determine the hash
1790                  */
1791                 if (reiserfs_rupasov_hash(s)) {
1792                         code = YURA_HASH;
1793                 } else if (reiserfs_tea_hash(s)) {
1794                         code = TEA_HASH;
1795                 } else if (reiserfs_r5_hash(s)) {
1796                         code = R5_HASH;
1797                 }
1798         }
1799
1800         /*
1801          * if we are mounted RW, and we have a new valid hash code, update
1802          * the super
1803          */
1804         if (code != UNSET_HASH &&
1805             !(s->s_flags & MS_RDONLY) &&
1806             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1807                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1808         }
1809         return code;
1810 }
1811
1812 /* return pointer to appropriate function */
1813 static hashf_t hash_function(struct super_block *s)
1814 {
1815         switch (what_hash(s)) {
1816         case TEA_HASH:
1817                 reiserfs_info(s, "Using tea hash to sort names\n");
1818                 return keyed_hash;
1819         case YURA_HASH:
1820                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1821                 return yura_hash;
1822         case R5_HASH:
1823                 reiserfs_info(s, "Using r5 hash to sort names\n");
1824                 return r5_hash;
1825         }
1826         return NULL;
1827 }
1828
1829 /* this is used to set up correct value for old partitions */
1830 static int function2code(hashf_t func)
1831 {
1832         if (func == keyed_hash)
1833                 return TEA_HASH;
1834         if (func == yura_hash)
1835                 return YURA_HASH;
1836         if (func == r5_hash)
1837                 return R5_HASH;
1838
1839         BUG();                  /* should never happen */
1840
1841         return 0;
1842 }
1843
1844 #define SWARN(silent, s, id, ...)                       \
1845         if (!(silent))                          \
1846                 reiserfs_warning(s, id, __VA_ARGS__)
1847
1848 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1849 {
1850         struct inode *root_inode;
1851         struct reiserfs_transaction_handle th;
1852         int old_format = 0;
1853         unsigned long blocks;
1854         unsigned int commit_max_age = 0;
1855         int jinit_done = 0;
1856         struct reiserfs_iget_args args;
1857         struct reiserfs_super_block *rs;
1858         char *jdev_name;
1859         struct reiserfs_sb_info *sbi;
1860         int errval = -EINVAL;
1861         char *qf_names[REISERFS_MAXQUOTAS] = {};
1862         unsigned int qfmt = 0;
1863
1864         save_mount_options(s, data);
1865
1866         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1867         if (!sbi)
1868                 return -ENOMEM;
1869         s->s_fs_info = sbi;
1870         /* Set default values for options: non-aggressive tails, RO on errors */
1871         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1872         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1873         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1874         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1875         sbi->s_alloc_options.preallocmin = 0;
1876         /* Preallocate by 16 blocks (17-1) at once */
1877         sbi->s_alloc_options.preallocsize = 17;
1878         /* setup default block allocator options */
1879         reiserfs_init_alloc_options(s);
1880
1881         spin_lock_init(&sbi->old_work_lock);
1882         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1883         mutex_init(&sbi->lock);
1884         sbi->lock_depth = -1;
1885
1886         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1887                                          s->s_id);
1888         if (!sbi->commit_wq) {
1889                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1890                 errval = -ENOMEM;
1891                 goto error_unlocked;
1892         }
1893
1894         jdev_name = NULL;
1895         if (reiserfs_parse_options
1896             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1897              &commit_max_age, qf_names, &qfmt) == 0) {
1898                 goto error_unlocked;
1899         }
1900         if (jdev_name && jdev_name[0]) {
1901                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1902                 if (!sbi->s_jdev) {
1903                         SWARN(silent, s, "", "Cannot allocate memory for "
1904                                 "journal device name");
1905                         goto error;
1906                 }
1907         }
1908 #ifdef CONFIG_QUOTA
1909         handle_quota_files(s, qf_names, &qfmt);
1910 #endif
1911
1912         if (blocks) {
1913                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1914                 goto error_unlocked;
1915         }
1916
1917         /*
1918          * try old format (undistributed bitmap, super block in 8-th 1k
1919          * block of a device)
1920          */
1921         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1922                 old_format = 1;
1923
1924         /*
1925          * try new format (64-th 1k block), which can contain reiserfs
1926          * super block
1927          */
1928         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1929                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1930                       s->s_id);
1931                 goto error_unlocked;
1932         }
1933
1934         rs = SB_DISK_SUPER_BLOCK(s);
1935         /*
1936          * Let's do basic sanity check to verify that underlying device is not
1937          * smaller than the filesystem. If the check fails then abort and
1938          * scream, because bad stuff will happen otherwise.
1939          */
1940         if (s->s_bdev && s->s_bdev->bd_inode
1941             && i_size_read(s->s_bdev->bd_inode) <
1942             sb_block_count(rs) * sb_blocksize(rs)) {
1943                 SWARN(silent, s, "", "Filesystem cannot be "
1944                       "mounted because it is bigger than the device");
1945                 SWARN(silent, s, "", "You may need to run fsck "
1946                       "or increase size of your LVM partition");
1947                 SWARN(silent, s, "", "Or may be you forgot to "
1948                       "reboot after fdisk when it told you to");
1949                 goto error_unlocked;
1950         }
1951
1952         sbi->s_mount_state = SB_REISERFS_STATE(s);
1953         sbi->s_mount_state = REISERFS_VALID_FS;
1954
1955         if ((errval = reiserfs_init_bitmap_cache(s))) {
1956                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1957                 goto error_unlocked;
1958         }
1959
1960         errval = -EINVAL;
1961 #ifdef CONFIG_REISERFS_CHECK
1962         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1963         SWARN(silent, s, "", "- it is slow mode for debugging.");
1964 #endif
1965
1966         /* make data=ordered the default */
1967         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1968             !reiserfs_data_writeback(s)) {
1969                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1970         }
1971
1972         if (reiserfs_data_log(s)) {
1973                 reiserfs_info(s, "using journaled data mode\n");
1974         } else if (reiserfs_data_ordered(s)) {
1975                 reiserfs_info(s, "using ordered data mode\n");
1976         } else {
1977                 reiserfs_info(s, "using writeback data mode\n");
1978         }
1979         if (reiserfs_barrier_flush(s)) {
1980                 printk("reiserfs: using flush barriers\n");
1981         }
1982
1983         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1984                 SWARN(silent, s, "sh-2022",
1985                       "unable to initialize journal space");
1986                 goto error_unlocked;
1987         } else {
1988                 /*
1989                  * once this is set, journal_release must be called
1990                  * if we error out of the mount
1991                  */
1992                 jinit_done = 1;
1993         }
1994
1995         if (reread_meta_blocks(s)) {
1996                 SWARN(silent, s, "jmacd-9",
1997                       "unable to reread meta blocks after journal init");
1998                 goto error_unlocked;
1999         }
2000
2001         if (replay_only(s))
2002                 goto error_unlocked;
2003
2004         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2005                 SWARN(silent, s, "clm-7000",
2006                       "Detected readonly device, marking FS readonly");
2007                 s->s_flags |= MS_RDONLY;
2008         }
2009         args.objectid = REISERFS_ROOT_OBJECTID;
2010         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2011         root_inode =
2012             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2013                          reiserfs_init_locked_inode, (void *)&args);
2014         if (!root_inode) {
2015                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2016                 goto error_unlocked;
2017         }
2018
2019         /*
2020          * This path assumed to be called with the BKL in the old times.
2021          * Now we have inherited the big reiserfs lock from it and many
2022          * reiserfs helpers called in the mount path and elsewhere require
2023          * this lock to be held even if it's not always necessary. Let's be
2024          * conservative and hold it early. The window can be reduced after
2025          * careful review of the code.
2026          */
2027         reiserfs_write_lock(s);
2028
2029         if (root_inode->i_state & I_NEW) {
2030                 reiserfs_read_locked_inode(root_inode, &args);
2031                 unlock_new_inode(root_inode);
2032         }
2033
2034         s->s_root = d_make_root(root_inode);
2035         if (!s->s_root)
2036                 goto error;
2037         /* define and initialize hash function */
2038         sbi->s_hash_function = hash_function(s);
2039         if (sbi->s_hash_function == NULL) {
2040                 dput(s->s_root);
2041                 s->s_root = NULL;
2042                 goto error;
2043         }
2044
2045         if (is_reiserfs_3_5(rs)
2046             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2047                 set_bit(REISERFS_3_5, &sbi->s_properties);
2048         else if (old_format)
2049                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2050         else
2051                 set_bit(REISERFS_3_6, &sbi->s_properties);
2052
2053         if (!(s->s_flags & MS_RDONLY)) {
2054
2055                 errval = journal_begin(&th, s, 1);
2056                 if (errval) {
2057                         dput(s->s_root);
2058                         s->s_root = NULL;
2059                         goto error;
2060                 }
2061                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2062
2063                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2064                 set_sb_fs_state(rs, 0);
2065
2066                 /*
2067                  * Clear out s_bmap_nr if it would wrap. We can handle this
2068                  * case, but older revisions can't. This will cause the
2069                  * file system to fail mount on those older implementations,
2070                  * avoiding corruption. -jeffm
2071                  */
2072                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2073                     sb_bmap_nr(rs) != 0) {
2074                         reiserfs_warning(s, "super-2030", "This file system "
2075                                         "claims to use %u bitmap blocks in "
2076                                         "its super block, but requires %u. "
2077                                         "Clearing to zero.", sb_bmap_nr(rs),
2078                                         reiserfs_bmap_count(s));
2079
2080                         set_sb_bmap_nr(rs, 0);
2081                 }
2082
2083                 if (old_format_only(s)) {
2084                         /*
2085                          * filesystem of format 3.5 either with standard
2086                          * or non-standard journal
2087                          */
2088                         if (convert_reiserfs(s)) {
2089                                 /* and -o conv is given */
2090                                 if (!silent)
2091                                         reiserfs_info(s,
2092                                                       "converting 3.5 filesystem to the 3.6 format");
2093
2094                                 if (is_reiserfs_3_5(rs))
2095                                         /*
2096                                          * put magic string of 3.6 format.
2097                                          * 2.2 will not be able to
2098                                          * mount this filesystem anymore
2099                                          */
2100                                         memcpy(rs->s_v1.s_magic,
2101                                                reiserfs_3_6_magic_string,
2102                                                sizeof
2103                                                (reiserfs_3_6_magic_string));
2104
2105                                 set_sb_version(rs, REISERFS_VERSION_2);
2106                                 reiserfs_convert_objectid_map_v1(s);
2107                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2108                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2109                         } else if (!silent) {
2110                                 reiserfs_info(s, "using 3.5.x disk format\n");
2111                         }
2112                 } else
2113                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2114
2115
2116                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2117                 errval = journal_end(&th);
2118                 if (errval) {
2119                         dput(s->s_root);
2120                         s->s_root = NULL;
2121                         goto error;
2122                 }
2123
2124                 reiserfs_write_unlock(s);
2125                 if ((errval = reiserfs_lookup_privroot(s)) ||
2126                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2127                         dput(s->s_root);
2128                         s->s_root = NULL;
2129                         goto error_unlocked;
2130                 }
2131                 reiserfs_write_lock(s);
2132
2133                 /*
2134                  * look for files which were to be removed in previous session
2135                  */
2136                 finish_unfinished(s);
2137         } else {
2138                 if (old_format_only(s) && !silent) {
2139                         reiserfs_info(s, "using 3.5.x disk format\n");
2140                 }
2141
2142                 reiserfs_write_unlock(s);
2143                 if ((errval = reiserfs_lookup_privroot(s)) ||
2144                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2145                         dput(s->s_root);
2146                         s->s_root = NULL;
2147                         goto error_unlocked;
2148                 }
2149                 reiserfs_write_lock(s);
2150         }
2151         /*
2152          * mark hash in super block: it could be unset. overwrite should be ok
2153          */
2154         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2155
2156         handle_attrs(s);
2157
2158         reiserfs_proc_info_init(s);
2159
2160         init_waitqueue_head(&(sbi->s_wait));
2161         spin_lock_init(&sbi->bitmap_lock);
2162
2163         reiserfs_write_unlock(s);
2164
2165         return (0);
2166
2167 error:
2168         reiserfs_write_unlock(s);
2169
2170 error_unlocked:
2171         /* kill the commit thread, free journal ram */
2172         if (jinit_done) {
2173                 reiserfs_write_lock(s);
2174                 journal_release_error(NULL, s);
2175                 reiserfs_write_unlock(s);
2176         }
2177
2178         if (sbi->commit_wq)
2179                 destroy_workqueue(sbi->commit_wq);
2180
2181         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2182
2183         reiserfs_free_bitmap_cache(s);
2184         if (SB_BUFFER_WITH_SB(s))
2185                 brelse(SB_BUFFER_WITH_SB(s));
2186 #ifdef CONFIG_QUOTA
2187         {
2188                 int j;
2189                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2190                         kfree(qf_names[j]);
2191         }
2192 #endif
2193         kfree(sbi);
2194
2195         s->s_fs_info = NULL;
2196         return errval;
2197 }
2198
2199 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2200 {
2201         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2202
2203         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2204         buf->f_bfree = sb_free_blocks(rs);
2205         buf->f_bavail = buf->f_bfree;
2206         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2207         buf->f_bsize = dentry->d_sb->s_blocksize;
2208         /* changed to accommodate gcc folks. */
2209         buf->f_type = REISERFS_SUPER_MAGIC;
2210         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2211         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2212                                 sizeof(rs->s_uuid)/2);
2213
2214         return 0;
2215 }
2216
2217 #ifdef CONFIG_QUOTA
2218 static int reiserfs_write_dquot(struct dquot *dquot)
2219 {
2220         struct reiserfs_transaction_handle th;
2221         int ret, err;
2222         int depth;
2223
2224         reiserfs_write_lock(dquot->dq_sb);
2225         ret =
2226             journal_begin(&th, dquot->dq_sb,
2227                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2228         if (ret)
2229                 goto out;
2230         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2231         ret = dquot_commit(dquot);
2232         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2233         err = journal_end(&th);
2234         if (!ret && err)
2235                 ret = err;
2236 out:
2237         reiserfs_write_unlock(dquot->dq_sb);
2238         return ret;
2239 }
2240
2241 static int reiserfs_acquire_dquot(struct dquot *dquot)
2242 {
2243         struct reiserfs_transaction_handle th;
2244         int ret, err;
2245         int depth;
2246
2247         reiserfs_write_lock(dquot->dq_sb);
2248         ret =
2249             journal_begin(&th, dquot->dq_sb,
2250                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2251         if (ret)
2252                 goto out;
2253         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2254         ret = dquot_acquire(dquot);
2255         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2256         err = journal_end(&th);
2257         if (!ret && err)
2258                 ret = err;
2259 out:
2260         reiserfs_write_unlock(dquot->dq_sb);
2261         return ret;
2262 }
2263
2264 static int reiserfs_release_dquot(struct dquot *dquot)
2265 {
2266         struct reiserfs_transaction_handle th;
2267         int ret, err;
2268
2269         reiserfs_write_lock(dquot->dq_sb);
2270         ret =
2271             journal_begin(&th, dquot->dq_sb,
2272                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2273         reiserfs_write_unlock(dquot->dq_sb);
2274         if (ret) {
2275                 /* Release dquot anyway to avoid endless cycle in dqput() */
2276                 dquot_release(dquot);
2277                 goto out;
2278         }
2279         ret = dquot_release(dquot);
2280         reiserfs_write_lock(dquot->dq_sb);
2281         err = journal_end(&th);
2282         if (!ret && err)
2283                 ret = err;
2284         reiserfs_write_unlock(dquot->dq_sb);
2285 out:
2286         return ret;
2287 }
2288
2289 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2290 {
2291         /* Are we journaling quotas? */
2292         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2293             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2294                 dquot_mark_dquot_dirty(dquot);
2295                 return reiserfs_write_dquot(dquot);
2296         } else
2297                 return dquot_mark_dquot_dirty(dquot);
2298 }
2299
2300 static int reiserfs_write_info(struct super_block *sb, int type)
2301 {
2302         struct reiserfs_transaction_handle th;
2303         int ret, err;
2304         int depth;
2305
2306         /* Data block + inode block */
2307         reiserfs_write_lock(sb);
2308         ret = journal_begin(&th, sb, 2);
2309         if (ret)
2310                 goto out;
2311         depth = reiserfs_write_unlock_nested(sb);
2312         ret = dquot_commit_info(sb, type);
2313         reiserfs_write_lock_nested(sb, depth);
2314         err = journal_end(&th);
2315         if (!ret && err)
2316                 ret = err;
2317 out:
2318         reiserfs_write_unlock(sb);
2319         return ret;
2320 }
2321
2322 /*
2323  * Turn on quotas during mount time - we need to find the quota file and such...
2324  */
2325 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2326 {
2327         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2328                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2329 }
2330
2331 /*
2332  * Standard function to be called on quota_on
2333  */
2334 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2335                              struct path *path)
2336 {
2337         int err;
2338         struct inode *inode;
2339         struct reiserfs_transaction_handle th;
2340         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2341
2342         reiserfs_write_lock(sb);
2343         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2344                 err = -EINVAL;
2345                 goto out;
2346         }
2347
2348         /* Quotafile not on the same filesystem? */
2349         if (path->dentry->d_sb != sb) {
2350                 err = -EXDEV;
2351                 goto out;
2352         }
2353         inode = d_inode(path->dentry);
2354         /*
2355          * We must not pack tails for quota files on reiserfs for quota
2356          * IO to work
2357          */
2358         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2359                 err = reiserfs_unpack(inode, NULL);
2360                 if (err) {
2361                         reiserfs_warning(sb, "super-6520",
2362                                 "Unpacking tail of quota file failed"
2363                                 " (%d). Cannot turn on quotas.", err);
2364                         err = -EINVAL;
2365                         goto out;
2366                 }
2367                 mark_inode_dirty(inode);
2368         }
2369         /* Journaling quota? */
2370         if (REISERFS_SB(sb)->s_qf_names[type]) {
2371                 /* Quotafile not of fs root? */
2372                 if (path->dentry->d_parent != sb->s_root)
2373                         reiserfs_warning(sb, "super-6521",
2374                                  "Quota file not on filesystem root. "
2375                                  "Journalled quota will not work.");
2376         }
2377
2378         /*
2379          * When we journal data on quota file, we have to flush journal to see
2380          * all updates to the file when we bypass pagecache...
2381          */
2382         if (reiserfs_file_data_log(inode)) {
2383                 /* Just start temporary transaction and finish it */
2384                 err = journal_begin(&th, sb, 1);
2385                 if (err)
2386                         goto out;
2387                 err = journal_end_sync(&th);
2388                 if (err)
2389                         goto out;
2390         }
2391         reiserfs_write_unlock(sb);
2392         return dquot_quota_on(sb, type, format_id, path);
2393 out:
2394         reiserfs_write_unlock(sb);
2395         return err;
2396 }
2397
2398 /*
2399  * Read data from quotafile - avoid pagecache and such because we cannot afford
2400  * acquiring the locks... As quota files are never truncated and quota code
2401  * itself serializes the operations (and no one else should touch the files)
2402  * we don't have to be afraid of races
2403  */
2404 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2405                                    size_t len, loff_t off)
2406 {
2407         struct inode *inode = sb_dqopt(sb)->files[type];
2408         unsigned long blk = off >> sb->s_blocksize_bits;
2409         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2410         size_t toread;
2411         struct buffer_head tmp_bh, *bh;
2412         loff_t i_size = i_size_read(inode);
2413
2414         if (off > i_size)
2415                 return 0;
2416         if (off + len > i_size)
2417                 len = i_size - off;
2418         toread = len;
2419         while (toread > 0) {
2420                 tocopy =
2421                     sb->s_blocksize - offset <
2422                     toread ? sb->s_blocksize - offset : toread;
2423                 tmp_bh.b_state = 0;
2424                 /*
2425                  * Quota files are without tails so we can safely
2426                  * use this function
2427                  */
2428                 reiserfs_write_lock(sb);
2429                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2430                 reiserfs_write_unlock(sb);
2431                 if (err)
2432                         return err;
2433                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2434                         memset(data, 0, tocopy);
2435                 else {
2436                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2437                         if (!bh)
2438                                 return -EIO;
2439                         memcpy(data, bh->b_data + offset, tocopy);
2440                         brelse(bh);
2441                 }
2442                 offset = 0;
2443                 toread -= tocopy;
2444                 data += tocopy;
2445                 blk++;
2446         }
2447         return len;
2448 }
2449
2450 /*
2451  * Write to quotafile (we know the transaction is already started and has
2452  * enough credits)
2453  */
2454 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2455                                     const char *data, size_t len, loff_t off)
2456 {
2457         struct inode *inode = sb_dqopt(sb)->files[type];
2458         unsigned long blk = off >> sb->s_blocksize_bits;
2459         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2460         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2461         size_t towrite = len;
2462         struct buffer_head tmp_bh, *bh;
2463
2464         if (!current->journal_info) {
2465                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2466                         (unsigned long long)off, (unsigned long long)len);
2467                 return -EIO;
2468         }
2469         while (towrite > 0) {
2470                 tocopy = sb->s_blocksize - offset < towrite ?
2471                     sb->s_blocksize - offset : towrite;
2472                 tmp_bh.b_state = 0;
2473                 reiserfs_write_lock(sb);
2474                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2475                 reiserfs_write_unlock(sb);
2476                 if (err)
2477                         goto out;
2478                 if (offset || tocopy != sb->s_blocksize)
2479                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2480                 else
2481                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2482                 if (!bh) {
2483                         err = -EIO;
2484                         goto out;
2485                 }
2486                 lock_buffer(bh);
2487                 memcpy(bh->b_data + offset, data, tocopy);
2488                 flush_dcache_page(bh->b_page);
2489                 set_buffer_uptodate(bh);
2490                 unlock_buffer(bh);
2491                 reiserfs_write_lock(sb);
2492                 reiserfs_prepare_for_journal(sb, bh, 1);
2493                 journal_mark_dirty(current->journal_info, bh);
2494                 if (!journal_quota)
2495                         reiserfs_add_ordered_list(inode, bh);
2496                 reiserfs_write_unlock(sb);
2497                 brelse(bh);
2498                 offset = 0;
2499                 towrite -= tocopy;
2500                 data += tocopy;
2501                 blk++;
2502         }
2503 out:
2504         if (len == towrite)
2505                 return err;
2506         if (inode->i_size < off + len - towrite)
2507                 i_size_write(inode, off + len - towrite);
2508         inode->i_version++;
2509         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2510         mark_inode_dirty(inode);
2511         return len - towrite;
2512 }
2513
2514 #endif
2515
2516 static struct dentry *get_super_block(struct file_system_type *fs_type,
2517                            int flags, const char *dev_name,
2518                            void *data)
2519 {
2520         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2521 }
2522
2523 static int __init init_reiserfs_fs(void)
2524 {
2525         int ret;
2526
2527         ret = init_inodecache();
2528         if (ret)
2529                 return ret;
2530
2531         reiserfs_proc_info_global_init();
2532
2533         ret = register_filesystem(&reiserfs_fs_type);
2534         if (ret)
2535                 goto out;
2536
2537         return 0;
2538 out:
2539         reiserfs_proc_info_global_done();
2540         destroy_inodecache();
2541
2542         return ret;
2543 }
2544
2545 static void __exit exit_reiserfs_fs(void)
2546 {
2547         reiserfs_proc_info_global_done();
2548         unregister_filesystem(&reiserfs_fs_type);
2549         destroy_inodecache();
2550 }
2551
2552 struct file_system_type reiserfs_fs_type = {
2553         .owner = THIS_MODULE,
2554         .name = "reiserfs",
2555         .mount = get_super_block,
2556         .kill_sb = reiserfs_kill_sb,
2557         .fs_flags = FS_REQUIRES_DEV,
2558 };
2559 MODULE_ALIAS_FS("reiserfs");
2560
2561 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2562 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2563 MODULE_LICENSE("GPL");
2564
2565 module_init(init_reiserfs_fs);
2566 module_exit(exit_reiserfs_fs);