fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <asm/uaccess.h>
  19 #include <linux/reiserfs_fs.h>
  20 #include <linux/reiserfs_acl.h>
  21 #include <linux/reiserfs_xattr.h>
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/buffer_head.h>
  25 #include <linux/exportfs.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/vfs.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.h>
  31
  32 struct file_system_type reiserfs_fs_type;
  33
  34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  37
  38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  39 {
  40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  41                         strlen(reiserfs_3_5_magic_string));
  42 }
  43
  44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  45 {
  46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  47                         strlen(reiserfs_3_6_magic_string));
  48 }
  49
  50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  51 {
  52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  53                         strlen(reiserfs_jr_magic_string));
  54 }
  55
  56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  57 {
  58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  59                 is_reiserfs_jr(rs));
  60 }
  61
  62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  64
  65 static int reiserfs_sync_fs(struct super_block *s, int wait)
  66 {
  67         struct reiserfs_transaction_handle th;
  68
  69         reiserfs_write_lock(s);
  70         if (!journal_begin(&th, s, 1))
  71                 if (!journal_end_sync(&th, s, 1))
  72                         reiserfs_flush_old_commits(s);
  73         s->s_dirt = 0;  /* Even if it's not true.
  74                          * We'll loop forever in sync_supers otherwise */
  75         reiserfs_write_unlock(s);
  76         return 0;
  77 }
  78
  79 static void reiserfs_write_super(struct super_block *s)
  80 {
  81         reiserfs_sync_fs(s, 1);
  82 }
  83
  84 static int reiserfs_freeze(struct super_block *s)
  85 {
  86         struct reiserfs_transaction_handle th;
  87         reiserfs_write_lock(s);
  88         if (!(s->s_flags & MS_RDONLY)) {
  89                 int err = journal_begin(&th, s, 1);
  90                 if (err) {
  91                         reiserfs_block_writes(&th);
  92                 } else {
  93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
  94                                                      1);
  95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
  96                         reiserfs_block_writes(&th);
  97                         journal_end_sync(&th, s, 1);
  98                 }
  99         }
 100         s->s_dirt = 0;
 101         reiserfs_write_unlock(s);
 102         return 0;
 103 }
 104
 105 static int reiserfs_unfreeze(struct super_block *s)
 106 {
 107         reiserfs_allow_writes(s);
 108         return 0;
 109 }
 110
 111 extern const struct in_core_key MAX_IN_CORE_KEY;
 112
 113 /* this is used to delete "save link" when there are no items of a
 114    file it points to. It can either happen if unlink is completed but
 115    "save unlink" removal, or if file has both unlink and truncate
 116    pending and as unlink completes first (because key of "save link"
 117    protecting unlink is bigger that a key lf "save link" which
 118    protects truncate), so there left no items to make truncate
 119    completion on */
 120 static int remove_save_link_only(struct super_block *s,
 121                                  struct reiserfs_key *key, int oid_free)
 122 {
 123         struct reiserfs_transaction_handle th;
 124         int err;
 125
 126         /* we are going to do one balancing */
 127         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 128         if (err)
 129                 return err;
 130
 131         reiserfs_delete_solid_item(&th, NULL, key);
 132         if (oid_free)
 133                 /* removals are protected by direct items */
 134                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 135
 136         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 137 }
 138
 139 #ifdef CONFIG_QUOTA
 140 static int reiserfs_quota_on_mount(struct super_block *, int);
 141 #endif
 142
 143 /* look for uncompleted unlinks and truncates and complete them */
 144 static int finish_unfinished(struct super_block *s)
 145 {
 146         INITIALIZE_PATH(path);
 147         struct cpu_key max_cpu_key, obj_key;
 148         struct reiserfs_key save_link_key, last_inode_key;
 149         int retval = 0;
 150         struct item_head *ih;
 151         struct buffer_head *bh;
 152         int item_pos;
 153         char *item;
 154         int done;
 155         struct inode *inode;
 156         int truncate;
 157 #ifdef CONFIG_QUOTA
 158         int i;
 159         int ms_active_set;
 160         int quota_enabled[MAXQUOTAS];
 161 #endif
 162
 163         /* compose key to look for "save" links */
 164         max_cpu_key.version = KEY_FORMAT_3_5;
 165         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 166         max_cpu_key.on_disk_key.k_objectid = ~0U;
 167         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 168         max_cpu_key.key_length = 3;
 169
 170         memset(&last_inode_key, 0, sizeof(last_inode_key));
 171
 172 #ifdef CONFIG_QUOTA
 173         /* Needed for iput() to work correctly and not trash data */
 174         if (s->s_flags & MS_ACTIVE) {
 175                 ms_active_set = 0;
 176         } else {
 177                 ms_active_set = 1;
 178                 s->s_flags |= MS_ACTIVE;
 179         }
 180         /* Turn on quotas so that they are updated correctly */
 181         for (i = 0; i < MAXQUOTAS; i++) {
 182                 quota_enabled[i] = 1;
 183                 if (REISERFS_SB(s)->s_qf_names[i]) {
 184                         int ret;
 185
 186                         if (sb_has_quota_active(s, i)) {
 187                                 quota_enabled[i] = 0;
 188                                 continue;
 189                         }
 190                         ret = reiserfs_quota_on_mount(s, i);
 191                         if (ret < 0)
 192                                 reiserfs_warning(s, "reiserfs-2500",
 193                                                  "cannot turn on journaled "
 194                                                  "quota: error %d", ret);
 195                 }
 196         }
 197 #endif
 198
 199         done = 0;
 200         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 201         while (!retval) {
 202                 retval = search_item(s, &max_cpu_key, &path);
 203                 if (retval != ITEM_NOT_FOUND) {
 204                         reiserfs_error(s, "vs-2140",
 205                                        "search_by_key returned %d", retval);
 206                         break;
 207                 }
 208
 209                 bh = get_last_bh(&path);
 210                 item_pos = get_item_pos(&path);
 211                 if (item_pos != B_NR_ITEMS(bh)) {
 212                         reiserfs_warning(s, "vs-2060",
 213                                          "wrong position found");
 214                         break;
 215                 }
 216                 item_pos--;
 217                 ih = B_N_PITEM_HEAD(bh, item_pos);
 218
 219                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 220                         /* there are no "save" links anymore */
 221                         break;
 222
 223                 save_link_key = ih->ih_key;
 224                 if (is_indirect_le_ih(ih))
 225                         truncate = 1;
 226                 else
 227                         truncate = 0;
 228
 229                 /* reiserfs_iget needs k_dirid and k_objectid only */
 230                 item = B_I_PITEM(bh, ih);
 231                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 232                 obj_key.on_disk_key.k_objectid =
 233                     le32_to_cpu(ih->ih_key.k_objectid);
 234                 obj_key.on_disk_key.k_offset = 0;
 235                 obj_key.on_disk_key.k_type = 0;
 236
 237                 pathrelse(&path);
 238
 239                 inode = reiserfs_iget(s, &obj_key);
 240                 if (!inode) {
 241                         /* the unlink almost completed, it just did not manage to remove
 242                            "save" link and release objectid */
 243                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 244                                          &obj_key);
 245                         retval = remove_save_link_only(s, &save_link_key, 1);
 246                         continue;
 247                 }
 248
 249                 if (!truncate && inode->i_nlink) {
 250                         /* file is not unlinked */
 251                         reiserfs_warning(s, "vs-2185",
 252                                          "file %K is not unlinked",
 253                                          &obj_key);
 254                         retval = remove_save_link_only(s, &save_link_key, 0);
 255                         continue;
 256                 }
 257                 dquot_initialize(inode);
 258
 259                 if (truncate && S_ISDIR(inode->i_mode)) {
 260                         /* We got a truncate request for a dir which is impossible.
 261                            The only imaginable way is to execute unfinished truncate request
 262                            then boot into old kernel, remove the file and create dir with
 263                            the same key. */
 264                         reiserfs_warning(s, "green-2101",
 265                                          "impossible truncate on a "
 266                                          "directory %k. Please report",
 267                                          INODE_PKEY(inode));
 268                         retval = remove_save_link_only(s, &save_link_key, 0);
 269                         truncate = 0;
 270                         iput(inode);
 271                         continue;
 272                 }
 273
 274                 if (truncate) {
 275                         REISERFS_I(inode)->i_flags |=
 276                             i_link_saved_truncate_mask;
 277                         /* not completed truncate found. New size was committed together
 278                            with "save" link */
 279                         reiserfs_info(s, "Truncating %k to %Ld ..",
 280                                       INODE_PKEY(inode), inode->i_size);
 281                         reiserfs_truncate_file(inode,
 282                                                0
 283                                                /*don't update modification time */
 284                                                );
 285                         retval = remove_save_link(inode, truncate);
 286                 } else {
 287                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 288                         /* not completed unlink (rmdir) found */
 289                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 290                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 291                                         sizeof(last_inode_key))){
 292                                 last_inode_key = *INODE_PKEY(inode);
 293                                 /* removal gets completed in iput */
 294                                 retval = 0;
 295                         } else {
 296                                 reiserfs_warning(s, "super-2189", "Dead loop "
 297                                                  "in finish_unfinished "
 298                                                  "detected, just remove "
 299                                                  "save link\n");
 300                                 retval = remove_save_link_only(s,
 301                                                         &save_link_key, 0);
 302                         }
 303                 }
 304
 305                 iput(inode);
 306                 printk("done\n");
 307                 done++;
 308         }
 309         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 310
 311 #ifdef CONFIG_QUOTA
 312         /* Turn quotas off */
 313         for (i = 0; i < MAXQUOTAS; i++) {
 314                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 315                         dquot_quota_off(s, i);
 316         }
 317         if (ms_active_set)
 318                 /* Restore the flag back */
 319                 s->s_flags &= ~MS_ACTIVE;
 320 #endif
 321         pathrelse(&path);
 322         if (done)
 323                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 324                               "Completed\n", done);
 325         return retval;
 326 }
 327
 328 /* to protect file being unlinked from getting lost we "safe" link files
 329    being unlinked. This link will be deleted in the same transaction with last
 330    item of file. mounting the filesystem we scan all these links and remove
 331    files which almost got lost */
 332 void add_save_link(struct reiserfs_transaction_handle *th,
 333                    struct inode *inode, int truncate)
 334 {
 335         INITIALIZE_PATH(path);
 336         int retval;
 337         struct cpu_key key;
 338         struct item_head ih;
 339         __le32 link;
 340
 341         BUG_ON(!th->t_trans_id);
 342
 343         /* file can only get one "save link" of each kind */
 344         RFALSE(truncate &&
 345                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 346                "saved link already exists for truncated inode %lx",
 347                (long)inode->i_ino);
 348         RFALSE(!truncate &&
 349                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 350                "saved link already exists for unlinked inode %lx",
 351                (long)inode->i_ino);
 352
 353         /* setup key of "save" link */
 354         key.version = KEY_FORMAT_3_5;
 355         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 356         key.on_disk_key.k_objectid = inode->i_ino;
 357         if (!truncate) {
 358                 /* unlink, rmdir, rename */
 359                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 360                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 361
 362                 /* item head of "safe" link */
 363                 make_le_item_head(&ih, &key, key.version,
 364                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 365                                   4 /*length */ , 0xffff /*free space */ );
 366         } else {
 367                 /* truncate */
 368                 if (S_ISDIR(inode->i_mode))
 369                         reiserfs_warning(inode->i_sb, "green-2102",
 370                                          "Adding a truncate savelink for "
 371                                          "a directory %k! Please report",
 372                                          INODE_PKEY(inode));
 373                 set_cpu_key_k_offset(&key, 1);
 374                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 375
 376                 /* item head of "safe" link */
 377                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 378                                   4 /*length */ , 0 /*free space */ );
 379         }
 380         key.key_length = 3;
 381
 382         /* look for its place in the tree */
 383         retval = search_item(inode->i_sb, &key, &path);
 384         if (retval != ITEM_NOT_FOUND) {
 385                 if (retval != -ENOSPC)
 386                         reiserfs_error(inode->i_sb, "vs-2100",
 387                                        "search_by_key (%K) returned %d", &key,
 388                                        retval);
 389                 pathrelse(&path);
 390                 return;
 391         }
 392
 393         /* body of "save" link */
 394         link = INODE_PKEY(inode)->k_dir_id;
 395
 396         /* put "save" link into tree, don't charge quota to anyone */
 397         retval =
 398             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 399         if (retval) {
 400                 if (retval != -ENOSPC)
 401                         reiserfs_error(inode->i_sb, "vs-2120",
 402                                        "insert_item returned %d", retval);
 403         } else {
 404                 if (truncate)
 405                         REISERFS_I(inode)->i_flags |=
 406                             i_link_saved_truncate_mask;
 407                 else
 408                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 409         }
 410 }
 411
 412 /* this opens transaction unlike add_save_link */
 413 int remove_save_link(struct inode *inode, int truncate)
 414 {
 415         struct reiserfs_transaction_handle th;
 416         struct reiserfs_key key;
 417         int err;
 418
 419         /* we are going to do one balancing only */
 420         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 421         if (err)
 422                 return err;
 423
 424         /* setup key of "save" link */
 425         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 426         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 427         if (!truncate) {
 428                 /* unlink, rmdir, rename */
 429                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 430                                     1 + inode->i_sb->s_blocksize);
 431                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 432         } else {
 433                 /* truncate */
 434                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 435                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 436         }
 437
 438         if ((truncate &&
 439              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 440             (!truncate &&
 441              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 442                 /* don't take quota bytes from anywhere */
 443                 reiserfs_delete_solid_item(&th, NULL, &key);
 444         if (!truncate) {
 445                 reiserfs_release_objectid(&th, inode->i_ino);
 446                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 447         } else
 448                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 449
 450         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 451 }
 452
 453 static void reiserfs_kill_sb(struct super_block *s)
 454 {
 455         if (REISERFS_SB(s)) {
 456                 if (REISERFS_SB(s)->xattr_root) {
 457                         d_invalidate(REISERFS_SB(s)->xattr_root);
 458                         dput(REISERFS_SB(s)->xattr_root);
 459                         REISERFS_SB(s)->xattr_root = NULL;
 460                 }
 461                 if (REISERFS_SB(s)->priv_root) {
 462                         d_invalidate(REISERFS_SB(s)->priv_root);
 463                         dput(REISERFS_SB(s)->priv_root);
 464                         REISERFS_SB(s)->priv_root = NULL;
 465                 }
 466         }
 467
 468         kill_block_super(s);
 469 }
 470
 471 static void reiserfs_put_super(struct super_block *s)
 472 {
 473         struct reiserfs_transaction_handle th;
 474         th.t_trans_id = 0;
 475
 476         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 477
 478         reiserfs_write_lock(s);
 479
 480         if (s->s_dirt)
 481                 reiserfs_write_super(s);
 482
 483         /* change file system state to current state if it was mounted with read-write permissions */
 484         if (!(s->s_flags & MS_RDONLY)) {
 485                 if (!journal_begin(&th, s, 10)) {
 486                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 487                                                      1);
 488                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 489                                             REISERFS_SB(s)->s_mount_state);
 490                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 491                 }
 492         }
 493
 494         /* note, journal_release checks for readonly mount, and can decide not
 495          ** to do a journal_end
 496          */
 497         journal_release(&th, s);
 498
 499         reiserfs_free_bitmap_cache(s);
 500
 501         brelse(SB_BUFFER_WITH_SB(s));
 502
 503         print_statistics(s);
 504
 505         if (REISERFS_SB(s)->reserved_blocks != 0) {
 506                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 507                                  REISERFS_SB(s)->reserved_blocks);
 508         }
 509
 510         reiserfs_proc_info_done(s);
 511
 512         reiserfs_write_unlock(s);
 513         mutex_destroy(&REISERFS_SB(s)->lock);
 514         kfree(s->s_fs_info);
 515         s->s_fs_info = NULL;
 516 }
 517
 518 static struct kmem_cache *reiserfs_inode_cachep;
 519
 520 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 521 {
 522         struct reiserfs_inode_info *ei;
 523         ei = (struct reiserfs_inode_info *)
 524             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 525         if (!ei)
 526                 return NULL;
 527         atomic_set(&ei->openers, 0);
 528         mutex_init(&ei->tailpack);
 529         return &ei->vfs_inode;
 530 }
 531
 532 static void reiserfs_i_callback(struct rcu_head *head)
 533 {
 534         struct inode *inode = container_of(head, struct inode, i_rcu);
 535         INIT_LIST_HEAD(&inode->i_dentry);
 536         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 537 }
 538
 539 static void reiserfs_destroy_inode(struct inode *inode)
 540 {
 541         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 542 }
 543
 544 static void init_once(void *foo)
 545 {
 546         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 547
 548         INIT_LIST_HEAD(&ei->i_prealloc_list);
 549         inode_init_once(&ei->vfs_inode);
 550 }
 551
 552 static int init_inodecache(void)
 553 {
 554         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 555                                                   sizeof(struct
 556                                                          reiserfs_inode_info),
 557                                                   0, (SLAB_RECLAIM_ACCOUNT|
 558                                                         SLAB_MEM_SPREAD),
 559                                                   init_once);
 560         if (reiserfs_inode_cachep == NULL)
 561                 return -ENOMEM;
 562         return 0;
 563 }
 564
 565 static void destroy_inodecache(void)
 566 {
 567         kmem_cache_destroy(reiserfs_inode_cachep);
 568 }
 569
 570 /* we don't mark inodes dirty, we just log them */
 571 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 572 {
 573         struct reiserfs_transaction_handle th;
 574
 575         int err = 0;
 576         int lock_depth;
 577
 578         if (inode->i_sb->s_flags & MS_RDONLY) {
 579                 reiserfs_warning(inode->i_sb, "clm-6006",
 580                                  "writing inode %lu on readonly FS",
 581                                  inode->i_ino);
 582                 return;
 583         }
 584         lock_depth = reiserfs_write_lock_once(inode->i_sb);
 585
 586         /* this is really only used for atime updates, so they don't have
 587          ** to be included in O_SYNC or fsync
 588          */
 589         err = journal_begin(&th, inode->i_sb, 1);
 590         if (err)
 591                 goto out;
 592
 593         reiserfs_update_sd(&th, inode);
 594         journal_end(&th, inode->i_sb, 1);
 595
 596 out:
 597         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 598 }
 599
 600 #ifdef CONFIG_QUOTA
 601 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 602                                     size_t, loff_t);
 603 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 604                                    loff_t);
 605 #endif
 606
 607 static const struct super_operations reiserfs_sops = {
 608         .alloc_inode = reiserfs_alloc_inode,
 609         .destroy_inode = reiserfs_destroy_inode,
 610         .write_inode = reiserfs_write_inode,
 611         .dirty_inode = reiserfs_dirty_inode,
 612         .evict_inode = reiserfs_evict_inode,
 613         .put_super = reiserfs_put_super,
 614         .write_super = reiserfs_write_super,
 615         .sync_fs = reiserfs_sync_fs,
 616         .freeze_fs = reiserfs_freeze,
 617         .unfreeze_fs = reiserfs_unfreeze,
 618         .statfs = reiserfs_statfs,
 619         .remount_fs = reiserfs_remount,
 620         .show_options = generic_show_options,
 621 #ifdef CONFIG_QUOTA
 622         .quota_read = reiserfs_quota_read,
 623         .quota_write = reiserfs_quota_write,
 624 #endif
 625 };
 626
 627 #ifdef CONFIG_QUOTA
 628 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 629
 630 static int reiserfs_write_dquot(struct dquot *);
 631 static int reiserfs_acquire_dquot(struct dquot *);
 632 static int reiserfs_release_dquot(struct dquot *);
 633 static int reiserfs_mark_dquot_dirty(struct dquot *);
 634 static int reiserfs_write_info(struct super_block *, int);
 635 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 636
 637 static const struct dquot_operations reiserfs_quota_operations = {
 638         .write_dquot = reiserfs_write_dquot,
 639         .acquire_dquot = reiserfs_acquire_dquot,
 640         .release_dquot = reiserfs_release_dquot,
 641         .mark_dirty = reiserfs_mark_dquot_dirty,
 642         .write_info = reiserfs_write_info,
 643         .alloc_dquot    = dquot_alloc,
 644         .destroy_dquot  = dquot_destroy,
 645 };
 646
 647 static const struct quotactl_ops reiserfs_qctl_operations = {
 648         .quota_on = reiserfs_quota_on,
 649         .quota_off = dquot_quota_off,
 650         .quota_sync = dquot_quota_sync,
 651         .get_info = dquot_get_dqinfo,
 652         .set_info = dquot_set_dqinfo,
 653         .get_dqblk = dquot_get_dqblk,
 654         .set_dqblk = dquot_set_dqblk,
 655 };
 656 #endif
 657
 658 static const struct export_operations reiserfs_export_ops = {
 659         .encode_fh = reiserfs_encode_fh,
 660         .fh_to_dentry = reiserfs_fh_to_dentry,
 661         .fh_to_parent = reiserfs_fh_to_parent,
 662         .get_parent = reiserfs_get_parent,
 663 };
 664
 665 /* this struct is used in reiserfs_getopt () for containing the value for those
 666    mount options that have values rather than being toggles. */
 667 typedef struct {
 668         char *value;
 669         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 670                                    value is found, 0 is no bits are to be changed. */
 671         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 672                                    value is found, 0 is no bits are to be changed. This is
 673                                    applied BEFORE setmask */
 674 } arg_desc_t;
 675
 676 /* Set this bit in arg_required to allow empty arguments */
 677 #define REISERFS_OPT_ALLOWEMPTY 31
 678
 679 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 680    mount options */
 681 typedef struct {
 682         char *option_name;
 683         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 684         const arg_desc_t *values;       /* list of values accepted by an option */
 685         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 686                                    value is found, 0 is no bits are to be changed. */
 687         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 688                                    value is found, 0 is no bits are to be changed. This is
 689                                    applied BEFORE setmask */
 690 } opt_desc_t;
 691
 692 /* possible values for -o data= */
 693 static const arg_desc_t logging_mode[] = {
 694         {"ordered", 1 << REISERFS_DATA_ORDERED,
 695          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 696         {"journal", 1 << REISERFS_DATA_LOG,
 697          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 698         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 699          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 700         {.value = NULL}
 701 };
 702
 703 /* possible values for -o barrier= */
 704 static const arg_desc_t barrier_mode[] = {
 705         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 706         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 707         {.value = NULL}
 708 };
 709
 710 /* possible values for "-o block-allocator=" and bits which are to be set in
 711    s_mount_opt of reiserfs specific part of in-core super block */
 712 static const arg_desc_t balloc[] = {
 713         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 714         {"border", 0, 1 << REISERFS_NO_BORDER},
 715         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 716         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 717         {"test4", 1 << REISERFS_TEST4, 0},
 718         {"notest4", 0, 1 << REISERFS_TEST4},
 719         {NULL, 0, 0}
 720 };
 721
 722 static const arg_desc_t tails[] = {
 723         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 724         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 725         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 726         {NULL, 0, 0}
 727 };
 728
 729 static const arg_desc_t error_actions[] = {
 730         {"panic", 1 << REISERFS_ERROR_PANIC,
 731          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 732         {"ro-remount", 1 << REISERFS_ERROR_RO,
 733          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 734 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 735         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 736          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 737 #endif
 738         {NULL, 0, 0},
 739 };
 740
 741 /* proceed only one option from a list *cur - string containing of mount options
 742    opts - array of options which are accepted
 743    opt_arg - if option is found and requires an argument and if it is specifed
 744    in the input - pointer to the argument is stored here
 745    bit_flags - if option requires to set a certain bit - it is set here
 746    return -1 if unknown option is found, opt->arg_required otherwise */
 747 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 748                            char **opt_arg, unsigned long *bit_flags)
 749 {
 750         char *p;
 751         /* foo=bar,
 752            ^   ^  ^
 753            |   |  +-- option_end
 754            |   +-- arg_start
 755            +-- option_start
 756          */
 757         const opt_desc_t *opt;
 758         const arg_desc_t *arg;
 759
 760         p = *cur;
 761
 762         /* assume argument cannot contain commas */
 763         *cur = strchr(p, ',');
 764         if (*cur) {
 765                 *(*cur) = '\0';
 766                 (*cur)++;
 767         }
 768
 769         if (!strncmp(p, "alloc=", 6)) {
 770                 /* Ugly special case, probably we should redo options parser so that
 771                    it can understand several arguments for some options, also so that
 772                    it can fill several bitfields with option values. */
 773                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 774                         return -1;
 775                 } else {
 776                         return 0;
 777                 }
 778         }
 779
 780         /* for every option in the list */
 781         for (opt = opts; opt->option_name; opt++) {
 782                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 783                         if (bit_flags) {
 784                                 if (opt->clrmask ==
 785                                     (1 << REISERFS_UNSUPPORTED_OPT))
 786                                         reiserfs_warning(s, "super-6500",
 787                                                          "%s not supported.\n",
 788                                                          p);
 789                                 else
 790                                         *bit_flags &= ~opt->clrmask;
 791                                 if (opt->setmask ==
 792                                     (1 << REISERFS_UNSUPPORTED_OPT))
 793                                         reiserfs_warning(s, "super-6501",
 794                                                          "%s not supported.\n",
 795                                                          p);
 796                                 else
 797                                         *bit_flags |= opt->setmask;
 798                         }
 799                         break;
 800                 }
 801         }
 802         if (!opt->option_name) {
 803                 reiserfs_warning(s, "super-6502",
 804                                  "unknown mount option \"%s\"", p);
 805                 return -1;
 806         }
 807
 808         p += strlen(opt->option_name);
 809         switch (*p) {
 810         case '=':
 811                 if (!opt->arg_required) {
 812                         reiserfs_warning(s, "super-6503",
 813                                          "the option \"%s\" does not "
 814                                          "require an argument\n",
 815                                          opt->option_name);
 816                         return -1;
 817                 }
 818                 break;
 819
 820         case 0:
 821                 if (opt->arg_required) {
 822                         reiserfs_warning(s, "super-6504",
 823                                          "the option \"%s\" requires an "
 824                                          "argument\n", opt->option_name);
 825                         return -1;
 826                 }
 827                 break;
 828         default:
 829                 reiserfs_warning(s, "super-6505",
 830                                  "head of option \"%s\" is only correct\n",
 831                                  opt->option_name);
 832                 return -1;
 833         }
 834
 835         /* move to the argument, or to next option if argument is not required */
 836         p++;
 837
 838         if (opt->arg_required
 839             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 840             && !strlen(p)) {
 841                 /* this catches "option=," if not allowed */
 842                 reiserfs_warning(s, "super-6506",
 843                                  "empty argument for \"%s\"\n",
 844                                  opt->option_name);
 845                 return -1;
 846         }
 847
 848         if (!opt->values) {
 849                 /* *=NULLopt_arg contains pointer to argument */
 850                 *opt_arg = p;
 851                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 852         }
 853
 854         /* values possible for this option are listed in opt->values */
 855         for (arg = opt->values; arg->value; arg++) {
 856                 if (!strcmp(p, arg->value)) {
 857                         if (bit_flags) {
 858                                 *bit_flags &= ~arg->clrmask;
 859                                 *bit_flags |= arg->setmask;
 860                         }
 861                         return opt->arg_required;
 862                 }
 863         }
 864
 865         reiserfs_warning(s, "super-6506",
 866                          "bad value \"%s\" for option \"%s\"\n", p,
 867                          opt->option_name);
 868         return -1;
 869 }
 870
 871 /* returns 0 if something is wrong in option string, 1 - otherwise */
 872 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 873                                   unsigned long *mount_options,
 874                                   /* after the parsing phase, contains the
 875                                      collection of bitflags defining what
 876                                      mount options were selected. */
 877                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
 878                                   char **jdev_name,
 879                                   unsigned int *commit_max_age,
 880                                   char **qf_names,
 881                                   unsigned int *qfmt)
 882 {
 883         int c;
 884         char *arg = NULL;
 885         char *pos;
 886         opt_desc_t opts[] = {
 887                 /* Compatibility stuff, so that -o notail for old setups still work */
 888                 {"tails",.arg_required = 't',.values = tails},
 889                 {"notail",.clrmask =
 890                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 891                 {"conv",.setmask = 1 << REISERFS_CONVERT},
 892                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
 893                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
 894                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 895 #ifdef CONFIG_REISERFS_FS_XATTR
 896                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 897                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 898 #else
 899                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 900                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 901 #endif
 902 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 903                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
 904                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 905 #else
 906                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
 907                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 908 #endif
 909                 {.option_name = "nolog"},
 910                 {"replayonly",.setmask = 1 << REPLAYONLY},
 911                 {"block-allocator",.arg_required = 'a',.values = balloc},
 912                 {"data",.arg_required = 'd',.values = logging_mode},
 913                 {"barrier",.arg_required = 'b',.values = barrier_mode},
 914                 {"resize",.arg_required = 'r',.values = NULL},
 915                 {"jdev",.arg_required = 'j',.values = NULL},
 916                 {"nolargeio",.arg_required = 'w',.values = NULL},
 917                 {"commit",.arg_required = 'c',.values = NULL},
 918                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
 919                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
 920                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
 921                 {"errors",.arg_required = 'e',.values = error_actions},
 922                 {"usrjquota",.arg_required =
 923                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 924                 {"grpjquota",.arg_required =
 925                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
 926                 {"jqfmt",.arg_required = 'f',.values = NULL},
 927                 {.option_name = NULL}
 928         };
 929
 930         *blocks = 0;
 931         if (!options || !*options)
 932                 /* use default configuration: create tails, journaling on, no
 933                    conversion to newest format */
 934                 return 1;
 935
 936         for (pos = options; pos;) {
 937                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
 938                 if (c == -1)
 939                         /* wrong option is given */
 940                         return 0;
 941
 942                 if (c == 'r') {
 943                         char *p;
 944
 945                         p = NULL;
 946                         /* "resize=NNN" or "resize=auto" */
 947
 948                         if (!strcmp(arg, "auto")) {
 949                                 /* From JFS code, to auto-get the size. */
 950                                 *blocks =
 951                                     s->s_bdev->bd_inode->i_size >> s->
 952                                     s_blocksize_bits;
 953                         } else {
 954                                 *blocks = simple_strtoul(arg, &p, 0);
 955                                 if (*p != '\0') {
 956                                         /* NNN does not look like a number */
 957                                         reiserfs_warning(s, "super-6507",
 958                                                          "bad value %s for "
 959                                                          "-oresize\n", arg);
 960                                         return 0;
 961                                 }
 962                         }
 963                 }
 964
 965                 if (c == 'c') {
 966                         char *p = NULL;
 967                         unsigned long val = simple_strtoul(arg, &p, 0);
 968                         /* commit=NNN (time in seconds) */
 969                         if (*p != '\0' || val >= (unsigned int)-1) {
 970                                 reiserfs_warning(s, "super-6508",
 971                                                  "bad value %s for -ocommit\n",
 972                                                  arg);
 973                                 return 0;
 974                         }
 975                         *commit_max_age = (unsigned int)val;
 976                 }
 977
 978                 if (c == 'w') {
 979                         reiserfs_warning(s, "super-6509", "nolargeio option "
 980                                          "is no longer supported");
 981                         return 0;
 982                 }
 983
 984                 if (c == 'j') {
 985                         if (arg && *arg && jdev_name) {
 986                                 if (*jdev_name) {       //Hm, already assigned?
 987                                         reiserfs_warning(s, "super-6510",
 988                                                          "journal device was "
 989                                                          "already specified to "
 990                                                          "be %s", *jdev_name);
 991                                         return 0;
 992                                 }
 993                                 *jdev_name = arg;
 994                         }
 995                 }
 996 #ifdef CONFIG_QUOTA
 997                 if (c == 'u' || c == 'g') {
 998                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
 999
1000                         if (sb_any_quota_loaded(s) &&
1001                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1002                                 reiserfs_warning(s, "super-6511",
1003                                                  "cannot change journaled "
1004                                                  "quota options when quota "
1005                                                  "turned on.");
1006                                 return 0;
1007                         }
1008                         if (*arg) {     /* Some filename specified? */
1009                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1010                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1011                                               arg)) {
1012                                         reiserfs_warning(s, "super-6512",
1013                                                          "%s quota file "
1014                                                          "already specified.",
1015                                                          QTYPE2NAME(qtype));
1016                                         return 0;
1017                                 }
1018                                 if (strchr(arg, '/')) {
1019                                         reiserfs_warning(s, "super-6513",
1020                                                          "quotafile must be "
1021                                                          "on filesystem root.");
1022                                         return 0;
1023                                 }
1024                                 qf_names[qtype] =
1025                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1026                                 if (!qf_names[qtype]) {
1027                                         reiserfs_warning(s, "reiserfs-2502",
1028                                                          "not enough memory "
1029                                                          "for storing "
1030                                                          "quotafile name.");
1031                                         return 0;
1032                                 }
1033                                 strcpy(qf_names[qtype], arg);
1034                                 *mount_options |= 1 << REISERFS_QUOTA;
1035                         } else {
1036                                 if (qf_names[qtype] !=
1037                                     REISERFS_SB(s)->s_qf_names[qtype])
1038                                         kfree(qf_names[qtype]);
1039                                 qf_names[qtype] = NULL;
1040                         }
1041                 }
1042                 if (c == 'f') {
1043                         if (!strcmp(arg, "vfsold"))
1044                                 *qfmt = QFMT_VFS_OLD;
1045                         else if (!strcmp(arg, "vfsv0"))
1046                                 *qfmt = QFMT_VFS_V0;
1047                         else {
1048                                 reiserfs_warning(s, "super-6514",
1049                                                  "unknown quota format "
1050                                                  "specified.");
1051                                 return 0;
1052                         }
1053                         if (sb_any_quota_loaded(s) &&
1054                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1055                                 reiserfs_warning(s, "super-6515",
1056                                                  "cannot change journaled "
1057                                                  "quota options when quota "
1058                                                  "turned on.");
1059                                 return 0;
1060                         }
1061                 }
1062 #else
1063                 if (c == 'u' || c == 'g' || c == 'f') {
1064                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1065                                          "quota options not supported.");
1066                         return 0;
1067                 }
1068 #endif
1069         }
1070
1071 #ifdef CONFIG_QUOTA
1072         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1073             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1074                 reiserfs_warning(s, "super-6515",
1075                                  "journaled quota format not specified.");
1076                 return 0;
1077         }
1078         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1079         if (!(*mount_options & (1 << REISERFS_QUOTA))
1080             && sb_any_quota_loaded(s)) {
1081                 reiserfs_warning(s, "super-6516", "quota options must "
1082                                  "be present when quota is turned on.");
1083                 return 0;
1084         }
1085 #endif
1086
1087         return 1;
1088 }
1089
1090 static void switch_data_mode(struct super_block *s, unsigned long mode)
1091 {
1092         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1093                                          (1 << REISERFS_DATA_ORDERED) |
1094                                          (1 << REISERFS_DATA_WRITEBACK));
1095         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1096 }
1097
1098 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1099 {
1100         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1101                 if (!reiserfs_data_log(s)) {
1102                         switch_data_mode(s, REISERFS_DATA_LOG);
1103                         reiserfs_info(s, "switching to journaled data mode\n");
1104                 }
1105         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1106                 if (!reiserfs_data_ordered(s)) {
1107                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1108                         reiserfs_info(s, "switching to ordered data mode\n");
1109                 }
1110         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1111                 if (!reiserfs_data_writeback(s)) {
1112                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1113                         reiserfs_info(s, "switching to writeback data mode\n");
1114                 }
1115         }
1116 }
1117
1118 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1119 {
1120         int flush = (1 << REISERFS_BARRIER_FLUSH);
1121         int none = (1 << REISERFS_BARRIER_NONE);
1122         int all_barrier = flush | none;
1123
1124         if (bits & all_barrier) {
1125                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1126                 if (bits & flush) {
1127                         REISERFS_SB(s)->s_mount_opt |= flush;
1128                         printk("reiserfs: enabling write barrier flush mode\n");
1129                 } else if (bits & none) {
1130                         REISERFS_SB(s)->s_mount_opt |= none;
1131                         printk("reiserfs: write barriers turned off\n");
1132                 }
1133         }
1134 }
1135
1136 static void handle_attrs(struct super_block *s)
1137 {
1138         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1139
1140         if (reiserfs_attrs(s)) {
1141                 if (old_format_only(s)) {
1142                         reiserfs_warning(s, "super-6517", "cannot support "
1143                                          "attributes on 3.5.x disk format");
1144                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1145                         return;
1146                 }
1147                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1148                         reiserfs_warning(s, "super-6518", "cannot support "
1149                                          "attributes until flag is set in "
1150                                          "super-block");
1151                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1152                 }
1153         }
1154 }
1155
1156 #ifdef CONFIG_QUOTA
1157 static void handle_quota_files(struct super_block *s, char **qf_names,
1158                                unsigned int *qfmt)
1159 {
1160         int i;
1161
1162         for (i = 0; i < MAXQUOTAS; i++) {
1163                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1164                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1165                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1166         }
1167         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1168 }
1169 #endif
1170
1171 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1172 {
1173         struct reiserfs_super_block *rs;
1174         struct reiserfs_transaction_handle th;
1175         unsigned long blocks;
1176         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1177         unsigned long safe_mask = 0;
1178         unsigned int commit_max_age = (unsigned int)-1;
1179         struct reiserfs_journal *journal = SB_JOURNAL(s);
1180         char *new_opts = kstrdup(arg, GFP_KERNEL);
1181         int err;
1182         char *qf_names[MAXQUOTAS];
1183         unsigned int qfmt = 0;
1184 #ifdef CONFIG_QUOTA
1185         int i;
1186 #endif
1187
1188         reiserfs_write_lock(s);
1189
1190 #ifdef CONFIG_QUOTA
1191         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1192 #endif
1193
1194         rs = SB_DISK_SUPER_BLOCK(s);
1195
1196         if (!reiserfs_parse_options
1197             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1198             qf_names, &qfmt)) {
1199 #ifdef CONFIG_QUOTA
1200                 for (i = 0; i < MAXQUOTAS; i++)
1201                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1202                                 kfree(qf_names[i]);
1203 #endif
1204                 err = -EINVAL;
1205                 goto out_err;
1206         }
1207 #ifdef CONFIG_QUOTA
1208         handle_quota_files(s, qf_names, &qfmt);
1209 #endif
1210
1211         handle_attrs(s);
1212
1213         /* Add options that are safe here */
1214         safe_mask |= 1 << REISERFS_SMALLTAIL;
1215         safe_mask |= 1 << REISERFS_LARGETAIL;
1216         safe_mask |= 1 << REISERFS_NO_BORDER;
1217         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1218         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1219         safe_mask |= 1 << REISERFS_TEST4;
1220         safe_mask |= 1 << REISERFS_ATTRS;
1221         safe_mask |= 1 << REISERFS_XATTRS_USER;
1222         safe_mask |= 1 << REISERFS_POSIXACL;
1223         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1224         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1225         safe_mask |= 1 << REISERFS_ERROR_RO;
1226         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1227         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1228         safe_mask |= 1 << REISERFS_QUOTA;
1229
1230         /* Update the bitmask, taking care to keep
1231          * the bits we're not allowed to change here */
1232         REISERFS_SB(s)->s_mount_opt =
1233             (REISERFS_SB(s)->
1234              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1235
1236         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1237                 journal->j_max_commit_age = commit_max_age;
1238                 journal->j_max_trans_age = commit_max_age;
1239         } else if (commit_max_age == 0) {
1240                 /* 0 means restore defaults. */
1241                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1242                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1243         }
1244
1245         if (blocks) {
1246                 err = reiserfs_resize(s, blocks);
1247                 if (err != 0)
1248                         goto out_err;
1249         }
1250
1251         if (*mount_flags & MS_RDONLY) {
1252                 reiserfs_xattr_init(s, *mount_flags);
1253                 /* remount read-only */
1254                 if (s->s_flags & MS_RDONLY)
1255                         /* it is read-only already */
1256                         goto out_ok;
1257
1258                 err = dquot_suspend(s, -1);
1259                 if (err < 0)
1260                         goto out_err;
1261
1262                 /* try to remount file system with read-only permissions */
1263                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1264                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1265                         goto out_ok;
1266                 }
1267
1268                 err = journal_begin(&th, s, 10);
1269                 if (err)
1270                         goto out_err;
1271
1272                 /* Mounting a rw partition read-only. */
1273                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1274                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1275                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1276         } else {
1277                 /* remount read-write */
1278                 if (!(s->s_flags & MS_RDONLY)) {
1279                         reiserfs_xattr_init(s, *mount_flags);
1280                         goto out_ok;    /* We are read-write already */
1281                 }
1282
1283                 if (reiserfs_is_journal_aborted(journal)) {
1284                         err = journal->j_errno;
1285                         goto out_err;
1286                 }
1287
1288                 handle_data_mode(s, mount_options);
1289                 handle_barrier_mode(s, mount_options);
1290                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1291                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1292                 err = journal_begin(&th, s, 10);
1293                 if (err)
1294                         goto out_err;
1295
1296                 /* Mount a partition which is read-only, read-write */
1297                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1298                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1299                 s->s_flags &= ~MS_RDONLY;
1300                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1301                 if (!old_format_only(s))
1302                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1303                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1304                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1305                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1306         }
1307         /* this will force a full flush of all journal lists */
1308         SB_JOURNAL(s)->j_must_wait = 1;
1309         err = journal_end(&th, s, 10);
1310         if (err)
1311                 goto out_err;
1312         s->s_dirt = 0;
1313
1314         if (!(*mount_flags & MS_RDONLY)) {
1315                 dquot_resume(s, -1);
1316                 finish_unfinished(s);
1317                 reiserfs_xattr_init(s, *mount_flags);
1318         }
1319
1320 out_ok:
1321         replace_mount_options(s, new_opts);
1322         reiserfs_write_unlock(s);
1323         return 0;
1324
1325 out_err:
1326         kfree(new_opts);
1327         reiserfs_write_unlock(s);
1328         return err;
1329 }
1330
1331 static int read_super_block(struct super_block *s, int offset)
1332 {
1333         struct buffer_head *bh;
1334         struct reiserfs_super_block *rs;
1335         int fs_blocksize;
1336
1337         bh = sb_bread(s, offset / s->s_blocksize);
1338         if (!bh) {
1339                 reiserfs_warning(s, "sh-2006",
1340                                  "bread failed (dev %s, block %lu, size %lu)",
1341                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1342                                  s->s_blocksize);
1343                 return 1;
1344         }
1345
1346         rs = (struct reiserfs_super_block *)bh->b_data;
1347         if (!is_any_reiserfs_magic_string(rs)) {
1348                 brelse(bh);
1349                 return 1;
1350         }
1351         //
1352         // ok, reiserfs signature (old or new) found in at the given offset
1353         //
1354         fs_blocksize = sb_blocksize(rs);
1355         brelse(bh);
1356         sb_set_blocksize(s, fs_blocksize);
1357
1358         bh = sb_bread(s, offset / s->s_blocksize);
1359         if (!bh) {
1360                 reiserfs_warning(s, "sh-2007",
1361                                  "bread failed (dev %s, block %lu, size %lu)",
1362                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1363                                  s->s_blocksize);
1364                 return 1;
1365         }
1366
1367         rs = (struct reiserfs_super_block *)bh->b_data;
1368         if (sb_blocksize(rs) != s->s_blocksize) {
1369                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1370                                  "filesystem on (dev %s, block %Lu, size %lu)",
1371                                  reiserfs_bdevname(s),
1372                                  (unsigned long long)bh->b_blocknr,
1373                                  s->s_blocksize);
1374                 brelse(bh);
1375                 return 1;
1376         }
1377
1378         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1379                 brelse(bh);
1380                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1381                                  "--rebuild-tree run detected. Please run\n"
1382                                  "reiserfsck --rebuild-tree and wait for a "
1383                                  "completion. If that fails\n"
1384                                  "get newer reiserfsprogs package");
1385                 return 1;
1386         }
1387
1388         SB_BUFFER_WITH_SB(s) = bh;
1389         SB_DISK_SUPER_BLOCK(s) = rs;
1390
1391         if (is_reiserfs_jr(rs)) {
1392                 /* magic is of non-standard journal filesystem, look at s_version to
1393                    find which format is in use */
1394                 if (sb_version(rs) == REISERFS_VERSION_2)
1395                         reiserfs_info(s, "found reiserfs format \"3.6\""
1396                                       " with non-standard journal\n");
1397                 else if (sb_version(rs) == REISERFS_VERSION_1)
1398                         reiserfs_info(s, "found reiserfs format \"3.5\""
1399                                       " with non-standard journal\n");
1400                 else {
1401                         reiserfs_warning(s, "sh-2012", "found unknown "
1402                                          "format \"%u\" of reiserfs with "
1403                                          "non-standard magic", sb_version(rs));
1404                         return 1;
1405                 }
1406         } else
1407                 /* s_version of standard format may contain incorrect information,
1408                    so we just look at the magic string */
1409                 reiserfs_info(s,
1410                               "found reiserfs format \"%s\" with standard journal\n",
1411                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1412
1413         s->s_op = &reiserfs_sops;
1414         s->s_export_op = &reiserfs_export_ops;
1415 #ifdef CONFIG_QUOTA
1416         s->s_qcop = &reiserfs_qctl_operations;
1417         s->dq_op = &reiserfs_quota_operations;
1418 #endif
1419
1420         /* new format is limited by the 32 bit wide i_blocks field, want to
1421          ** be one full block below that.
1422          */
1423         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1424         return 0;
1425 }
1426
1427 /* after journal replay, reread all bitmap and super blocks */
1428 static int reread_meta_blocks(struct super_block *s)
1429 {
1430         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1431         reiserfs_write_unlock(s);
1432         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1433         reiserfs_write_lock(s);
1434         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1435                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1436                 return 1;
1437         }
1438
1439         return 0;
1440 }
1441
1442 /////////////////////////////////////////////////////
1443 // hash detection stuff
1444
1445 // if root directory is empty - we set default - Yura's - hash and
1446 // warn about it
1447 // FIXME: we look for only one name in a directory. If tea and yura
1448 // bith have the same value - we ask user to send report to the
1449 // mailing list
1450 static __u32 find_hash_out(struct super_block *s)
1451 {
1452         int retval;
1453         struct inode *inode;
1454         struct cpu_key key;
1455         INITIALIZE_PATH(path);
1456         struct reiserfs_dir_entry de;
1457         __u32 hash = DEFAULT_HASH;
1458
1459         inode = s->s_root->d_inode;
1460
1461         do {                    // Some serious "goto"-hater was there ;)
1462                 u32 teahash, r5hash, yurahash;
1463
1464                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1465                 retval = search_by_entry_key(s, &key, &path, &de);
1466                 if (retval == IO_ERROR) {
1467                         pathrelse(&path);
1468                         return UNSET_HASH;
1469                 }
1470                 if (retval == NAME_NOT_FOUND)
1471                         de.de_entry_num--;
1472                 set_de_name_and_namelen(&de);
1473                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1474                         /* allow override in this case */
1475                         if (reiserfs_rupasov_hash(s)) {
1476                                 hash = YURA_HASH;
1477                         }
1478                         reiserfs_info(s, "FS seems to be empty, autodetect "
1479                                          "is using the default hash\n");
1480                         break;
1481                 }
1482                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1483                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1484                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1485                 if (((teahash == r5hash)
1486                      &&
1487                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1488                       == r5hash)) || ((teahash == yurahash)
1489                                       && (yurahash ==
1490                                           GET_HASH_VALUE(deh_offset
1491                                                          (&
1492                                                           (de.
1493                                                            de_deh[de.
1494                                                                   de_entry_num])))))
1495                     || ((r5hash == yurahash)
1496                         && (yurahash ==
1497                             GET_HASH_VALUE(deh_offset
1498                                            (&(de.de_deh[de.de_entry_num])))))) {
1499                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1500                                          "automatically detect hash function. "
1501                                          "Please mount with -o "
1502                                          "hash={tea,rupasov,r5}");
1503                         hash = UNSET_HASH;
1504                         break;
1505                 }
1506                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1507                     yurahash)
1508                         hash = YURA_HASH;
1509                 else if (GET_HASH_VALUE
1510                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1511                         hash = TEA_HASH;
1512                 else if (GET_HASH_VALUE
1513                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1514                         hash = R5_HASH;
1515                 else {
1516                         reiserfs_warning(s, "reiserfs-2506",
1517                                          "Unrecognised hash function");
1518                         hash = UNSET_HASH;
1519                 }
1520         } while (0);
1521
1522         pathrelse(&path);
1523         return hash;
1524 }
1525
1526 // finds out which hash names are sorted with
1527 static int what_hash(struct super_block *s)
1528 {
1529         __u32 code;
1530
1531         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1532
1533         /* reiserfs_hash_detect() == true if any of the hash mount options
1534          ** were used.  We must check them to make sure the user isn't
1535          ** using a bad hash value
1536          */
1537         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1538                 code = find_hash_out(s);
1539
1540         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1541                 /* detection has found the hash, and we must check against the
1542                  ** mount options
1543                  */
1544                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1545                         reiserfs_warning(s, "reiserfs-2507",
1546                                          "Error, %s hash detected, "
1547                                          "unable to force rupasov hash",
1548                                          reiserfs_hashname(code));
1549                         code = UNSET_HASH;
1550                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1551                         reiserfs_warning(s, "reiserfs-2508",
1552                                          "Error, %s hash detected, "
1553                                          "unable to force tea hash",
1554                                          reiserfs_hashname(code));
1555                         code = UNSET_HASH;
1556                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1557                         reiserfs_warning(s, "reiserfs-2509",
1558                                          "Error, %s hash detected, "
1559                                          "unable to force r5 hash",
1560                                          reiserfs_hashname(code));
1561                         code = UNSET_HASH;
1562                 }
1563         } else {
1564                 /* find_hash_out was not called or could not determine the hash */
1565                 if (reiserfs_rupasov_hash(s)) {
1566                         code = YURA_HASH;
1567                 } else if (reiserfs_tea_hash(s)) {
1568                         code = TEA_HASH;
1569                 } else if (reiserfs_r5_hash(s)) {
1570                         code = R5_HASH;
1571                 }
1572         }
1573
1574         /* if we are mounted RW, and we have a new valid hash code, update
1575          ** the super
1576          */
1577         if (code != UNSET_HASH &&
1578             !(s->s_flags & MS_RDONLY) &&
1579             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1580                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1581         }
1582         return code;
1583 }
1584
1585 // return pointer to appropriate function
1586 static hashf_t hash_function(struct super_block *s)
1587 {
1588         switch (what_hash(s)) {
1589         case TEA_HASH:
1590                 reiserfs_info(s, "Using tea hash to sort names\n");
1591                 return keyed_hash;
1592         case YURA_HASH:
1593                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1594                 return yura_hash;
1595         case R5_HASH:
1596                 reiserfs_info(s, "Using r5 hash to sort names\n");
1597                 return r5_hash;
1598         }
1599         return NULL;
1600 }
1601
1602 // this is used to set up correct value for old partitions
1603 static int function2code(hashf_t func)
1604 {
1605         if (func == keyed_hash)
1606                 return TEA_HASH;
1607         if (func == yura_hash)
1608                 return YURA_HASH;
1609         if (func == r5_hash)
1610                 return R5_HASH;
1611
1612         BUG();                  // should never happen
1613
1614         return 0;
1615 }
1616
1617 #define SWARN(silent, s, id, ...)                       \
1618         if (!(silent))                          \
1619                 reiserfs_warning(s, id, __VA_ARGS__)
1620
1621 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1622 {
1623         struct inode *root_inode;
1624         struct reiserfs_transaction_handle th;
1625         int old_format = 0;
1626         unsigned long blocks;
1627         unsigned int commit_max_age = 0;
1628         int jinit_done = 0;
1629         struct reiserfs_iget_args args;
1630         struct reiserfs_super_block *rs;
1631         char *jdev_name;
1632         struct reiserfs_sb_info *sbi;
1633         int errval = -EINVAL;
1634         char *qf_names[MAXQUOTAS] = {};
1635         unsigned int qfmt = 0;
1636
1637         save_mount_options(s, data);
1638
1639         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1640         if (!sbi)
1641                 return -ENOMEM;
1642         s->s_fs_info = sbi;
1643         /* Set default values for options: non-aggressive tails, RO on errors */
1644         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1645         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1646         /* no preallocation minimum, be smart in
1647            reiserfs_file_write instead */
1648         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1649         /* Preallocate by 16 blocks (17-1) at once */
1650         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1651         /* setup default block allocator options */
1652         reiserfs_init_alloc_options(s);
1653
1654         mutex_init(&REISERFS_SB(s)->lock);
1655         REISERFS_SB(s)->lock_depth = -1;
1656
1657         /*
1658          * This function is called with the bkl, which also was the old
1659          * locking used here.
1660          * do_journal_begin() will soon check if we hold the lock (ie: was the
1661          * bkl). This is likely because do_journal_begin() has several another
1662          * callers because at this time, it doesn't seem to be necessary to
1663          * protect against anything.
1664          * Anyway, let's be conservative and lock for now.
1665          */
1666         reiserfs_write_lock(s);
1667
1668         jdev_name = NULL;
1669         if (reiserfs_parse_options
1670             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1671              &commit_max_age, qf_names, &qfmt) == 0) {
1672                 goto error;
1673         }
1674 #ifdef CONFIG_QUOTA
1675         handle_quota_files(s, qf_names, &qfmt);
1676 #endif
1677
1678         if (blocks) {
1679                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1680                 goto error;
1681         }
1682
1683         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1684         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1685                 old_format = 1;
1686         /* try new format (64-th 1k block), which can contain reiserfs super block */
1687         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1688                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1689                       reiserfs_bdevname(s));
1690                 goto error;
1691         }
1692
1693         rs = SB_DISK_SUPER_BLOCK(s);
1694         /* Let's do basic sanity check to verify that underlying device is not
1695            smaller than the filesystem. If the check fails then abort and scream,
1696            because bad stuff will happen otherwise. */
1697         if (s->s_bdev && s->s_bdev->bd_inode
1698             && i_size_read(s->s_bdev->bd_inode) <
1699             sb_block_count(rs) * sb_blocksize(rs)) {
1700                 SWARN(silent, s, "", "Filesystem cannot be "
1701                       "mounted because it is bigger than the device");
1702                 SWARN(silent, s, "", "You may need to run fsck "
1703                       "or increase size of your LVM partition");
1704                 SWARN(silent, s, "", "Or may be you forgot to "
1705                       "reboot after fdisk when it told you to");
1706                 goto error;
1707         }
1708
1709         sbi->s_mount_state = SB_REISERFS_STATE(s);
1710         sbi->s_mount_state = REISERFS_VALID_FS;
1711
1712         if ((errval = reiserfs_init_bitmap_cache(s))) {
1713                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1714                 goto error;
1715         }
1716         errval = -EINVAL;
1717 #ifdef CONFIG_REISERFS_CHECK
1718         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1719         SWARN(silent, s, "", "- it is slow mode for debugging.");
1720 #endif
1721
1722         /* make data=ordered the default */
1723         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1724             !reiserfs_data_writeback(s)) {
1725                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1726         }
1727
1728         if (reiserfs_data_log(s)) {
1729                 reiserfs_info(s, "using journaled data mode\n");
1730         } else if (reiserfs_data_ordered(s)) {
1731                 reiserfs_info(s, "using ordered data mode\n");
1732         } else {
1733                 reiserfs_info(s, "using writeback data mode\n");
1734         }
1735         if (reiserfs_barrier_flush(s)) {
1736                 printk("reiserfs: using flush barriers\n");
1737         }
1738         // set_device_ro(s->s_dev, 1) ;
1739         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1740                 SWARN(silent, s, "sh-2022",
1741                       "unable to initialize journal space");
1742                 goto error;
1743         } else {
1744                 jinit_done = 1; /* once this is set, journal_release must be called
1745                                  ** if we error out of the mount
1746                                  */
1747         }
1748         if (reread_meta_blocks(s)) {
1749                 SWARN(silent, s, "jmacd-9",
1750                       "unable to reread meta blocks after journal init");
1751                 goto error;
1752         }
1753
1754         if (replay_only(s))
1755                 goto error;
1756
1757         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1758                 SWARN(silent, s, "clm-7000",
1759                       "Detected readonly device, marking FS readonly");
1760                 s->s_flags |= MS_RDONLY;
1761         }
1762         args.objectid = REISERFS_ROOT_OBJECTID;
1763         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1764         root_inode =
1765             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1766                          reiserfs_init_locked_inode, (void *)(&args));
1767         if (!root_inode) {
1768                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1769                 goto error;
1770         }
1771
1772         if (root_inode->i_state & I_NEW) {
1773                 reiserfs_read_locked_inode(root_inode, &args);
1774                 unlock_new_inode(root_inode);
1775         }
1776
1777         s->s_root = d_alloc_root(root_inode);
1778         if (!s->s_root) {
1779                 iput(root_inode);
1780                 goto error;
1781         }
1782         // define and initialize hash function
1783         sbi->s_hash_function = hash_function(s);
1784         if (sbi->s_hash_function == NULL) {
1785                 dput(s->s_root);
1786                 s->s_root = NULL;
1787                 goto error;
1788         }
1789
1790         if (is_reiserfs_3_5(rs)
1791             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1792                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1793         else if (old_format)
1794                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1795         else
1796                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1797
1798         if (!(s->s_flags & MS_RDONLY)) {
1799
1800                 errval = journal_begin(&th, s, 1);
1801                 if (errval) {
1802                         dput(s->s_root);
1803                         s->s_root = NULL;
1804                         goto error;
1805                 }
1806                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1807
1808                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1809                 set_sb_fs_state(rs, 0);
1810
1811                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1812                  * case, but older revisions can't. This will cause the
1813                  * file system to fail mount on those older implementations,
1814                  * avoiding corruption. -jeffm */
1815                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1816                     sb_bmap_nr(rs) != 0) {
1817                         reiserfs_warning(s, "super-2030", "This file system "
1818                                         "claims to use %u bitmap blocks in "
1819                                         "its super block, but requires %u. "
1820                                         "Clearing to zero.", sb_bmap_nr(rs),
1821                                         reiserfs_bmap_count(s));
1822
1823                         set_sb_bmap_nr(rs, 0);
1824                 }
1825
1826                 if (old_format_only(s)) {
1827                         /* filesystem of format 3.5 either with standard or non-standard
1828                            journal */
1829                         if (convert_reiserfs(s)) {
1830                                 /* and -o conv is given */
1831                                 if (!silent)
1832                                         reiserfs_info(s,
1833                                                       "converting 3.5 filesystem to the 3.6 format");
1834
1835                                 if (is_reiserfs_3_5(rs))
1836                                         /* put magic string of 3.6 format. 2.2 will not be able to
1837                                            mount this filesystem anymore */
1838                                         memcpy(rs->s_v1.s_magic,
1839                                                reiserfs_3_6_magic_string,
1840                                                sizeof
1841                                                (reiserfs_3_6_magic_string));
1842
1843                                 set_sb_version(rs, REISERFS_VERSION_2);
1844                                 reiserfs_convert_objectid_map_v1(s);
1845                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1846                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1847                         } else if (!silent) {
1848                                 reiserfs_info(s, "using 3.5.x disk format\n");
1849                         }
1850                 } else
1851                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1852
1853
1854                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1855                 errval = journal_end(&th, s, 1);
1856                 if (errval) {
1857                         dput(s->s_root);
1858                         s->s_root = NULL;
1859                         goto error;
1860                 }
1861
1862                 if ((errval = reiserfs_lookup_privroot(s)) ||
1863                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1864                         dput(s->s_root);
1865                         s->s_root = NULL;
1866                         goto error;
1867                 }
1868
1869                 /* look for files which were to be removed in previous session */
1870                 finish_unfinished(s);
1871         } else {
1872                 if (old_format_only(s) && !silent) {
1873                         reiserfs_info(s, "using 3.5.x disk format\n");
1874                 }
1875
1876                 if ((errval = reiserfs_lookup_privroot(s)) ||
1877                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1878                         dput(s->s_root);
1879                         s->s_root = NULL;
1880                         goto error;
1881                 }
1882         }
1883         // mark hash in super block: it could be unset. overwrite should be ok
1884         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1885
1886         handle_attrs(s);
1887
1888         reiserfs_proc_info_init(s);
1889
1890         init_waitqueue_head(&(sbi->s_wait));
1891         spin_lock_init(&sbi->bitmap_lock);
1892
1893         reiserfs_write_unlock(s);
1894
1895         return (0);
1896
1897 error:
1898         if (jinit_done) {       /* kill the commit thread, free journal ram */
1899                 journal_release_error(NULL, s);
1900         }
1901
1902         reiserfs_write_unlock(s);
1903
1904         reiserfs_free_bitmap_cache(s);
1905         if (SB_BUFFER_WITH_SB(s))
1906                 brelse(SB_BUFFER_WITH_SB(s));
1907 #ifdef CONFIG_QUOTA
1908         {
1909                 int j;
1910                 for (j = 0; j < MAXQUOTAS; j++)
1911                         kfree(qf_names[j]);
1912         }
1913 #endif
1914         kfree(sbi);
1915
1916         s->s_fs_info = NULL;
1917         return errval;
1918 }
1919
1920 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1921 {
1922         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1923
1924         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1925         buf->f_bfree = sb_free_blocks(rs);
1926         buf->f_bavail = buf->f_bfree;
1927         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1928         buf->f_bsize = dentry->d_sb->s_blocksize;
1929         /* changed to accommodate gcc folks. */
1930         buf->f_type = REISERFS_SUPER_MAGIC;
1931         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1932         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1933                                 sizeof(rs->s_uuid)/2);
1934
1935         return 0;
1936 }
1937
1938 #ifdef CONFIG_QUOTA
1939 static int reiserfs_write_dquot(struct dquot *dquot)
1940 {
1941         struct reiserfs_transaction_handle th;
1942         int ret, err;
1943
1944         reiserfs_write_lock(dquot->dq_sb);
1945         ret =
1946             journal_begin(&th, dquot->dq_sb,
1947                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1948         if (ret)
1949                 goto out;
1950         ret = dquot_commit(dquot);
1951         err =
1952             journal_end(&th, dquot->dq_sb,
1953                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1954         if (!ret && err)
1955                 ret = err;
1956       out:
1957         reiserfs_write_unlock(dquot->dq_sb);
1958         return ret;
1959 }
1960
1961 static int reiserfs_acquire_dquot(struct dquot *dquot)
1962 {
1963         struct reiserfs_transaction_handle th;
1964         int ret, err;
1965
1966         reiserfs_write_lock(dquot->dq_sb);
1967         ret =
1968             journal_begin(&th, dquot->dq_sb,
1969                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1970         if (ret)
1971                 goto out;
1972         ret = dquot_acquire(dquot);
1973         err =
1974             journal_end(&th, dquot->dq_sb,
1975                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1976         if (!ret && err)
1977                 ret = err;
1978       out:
1979         reiserfs_write_unlock(dquot->dq_sb);
1980         return ret;
1981 }
1982
1983 static int reiserfs_release_dquot(struct dquot *dquot)
1984 {
1985         struct reiserfs_transaction_handle th;
1986         int ret, err;
1987
1988         reiserfs_write_lock(dquot->dq_sb);
1989         ret =
1990             journal_begin(&th, dquot->dq_sb,
1991                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1992         if (ret) {
1993                 /* Release dquot anyway to avoid endless cycle in dqput() */
1994                 dquot_release(dquot);
1995                 goto out;
1996         }
1997         ret = dquot_release(dquot);
1998         err =
1999             journal_end(&th, dquot->dq_sb,
2000                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2001         if (!ret && err)
2002                 ret = err;
2003       out:
2004         reiserfs_write_unlock(dquot->dq_sb);
2005         return ret;
2006 }
2007
2008 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2009 {
2010         /* Are we journaling quotas? */
2011         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2012             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2013                 dquot_mark_dquot_dirty(dquot);
2014                 return reiserfs_write_dquot(dquot);
2015         } else
2016                 return dquot_mark_dquot_dirty(dquot);
2017 }
2018
2019 static int reiserfs_write_info(struct super_block *sb, int type)
2020 {
2021         struct reiserfs_transaction_handle th;
2022         int ret, err;
2023
2024         /* Data block + inode block */
2025         reiserfs_write_lock(sb);
2026         ret = journal_begin(&th, sb, 2);
2027         if (ret)
2028                 goto out;
2029         ret = dquot_commit_info(sb, type);
2030         err = journal_end(&th, sb, 2);
2031         if (!ret && err)
2032                 ret = err;
2033       out:
2034         reiserfs_write_unlock(sb);
2035         return ret;
2036 }
2037
2038 /*
2039  * Turn on quotas during mount time - we need to find the quota file and such...
2040  */
2041 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2042 {
2043         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2044                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2045 }
2046
2047 /*
2048  * Standard function to be called on quota_on
2049  */
2050 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2051                              struct path *path)
2052 {
2053         int err;
2054         struct inode *inode;
2055         struct reiserfs_transaction_handle th;
2056
2057         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2058                 return -EINVAL;
2059
2060         /* Quotafile not on the same filesystem? */
2061         if (path->mnt->mnt_sb != sb) {
2062                 err = -EXDEV;
2063                 goto out;
2064         }
2065         inode = path->dentry->d_inode;
2066         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2067         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2068                 err = reiserfs_unpack(inode, NULL);
2069                 if (err) {
2070                         reiserfs_warning(sb, "super-6520",
2071                                 "Unpacking tail of quota file failed"
2072                                 " (%d). Cannot turn on quotas.", err);
2073                         err = -EINVAL;
2074                         goto out;
2075                 }
2076                 mark_inode_dirty(inode);
2077         }
2078         /* Journaling quota? */
2079         if (REISERFS_SB(sb)->s_qf_names[type]) {
2080                 /* Quotafile not of fs root? */
2081                 if (path->dentry->d_parent != sb->s_root)
2082                         reiserfs_warning(sb, "super-6521",
2083                                  "Quota file not on filesystem root. "
2084                                  "Journalled quota will not work.");
2085         }
2086
2087         /*
2088          * When we journal data on quota file, we have to flush journal to see
2089          * all updates to the file when we bypass pagecache...
2090          */
2091         if (reiserfs_file_data_log(inode)) {
2092                 /* Just start temporary transaction and finish it */
2093                 err = journal_begin(&th, sb, 1);
2094                 if (err)
2095                         goto out;
2096                 err = journal_end_sync(&th, sb, 1);
2097                 if (err)
2098                         goto out;
2099         }
2100         err = dquot_quota_on(sb, type, format_id, path);
2101 out:
2102         return err;
2103 }
2104
2105 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2106  * acquiring the locks... As quota files are never truncated and quota code
2107  * itself serializes the operations (and no one else should touch the files)
2108  * we don't have to be afraid of races */
2109 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2110                                    size_t len, loff_t off)
2111 {
2112         struct inode *inode = sb_dqopt(sb)->files[type];
2113         unsigned long blk = off >> sb->s_blocksize_bits;
2114         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2115         size_t toread;
2116         struct buffer_head tmp_bh, *bh;
2117         loff_t i_size = i_size_read(inode);
2118
2119         if (off > i_size)
2120                 return 0;
2121         if (off + len > i_size)
2122                 len = i_size - off;
2123         toread = len;
2124         while (toread > 0) {
2125                 tocopy =
2126                     sb->s_blocksize - offset <
2127                     toread ? sb->s_blocksize - offset : toread;
2128                 tmp_bh.b_state = 0;
2129                 /* Quota files are without tails so we can safely use this function */
2130                 reiserfs_write_lock(sb);
2131                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2132                 reiserfs_write_unlock(sb);
2133                 if (err)
2134                         return err;
2135                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2136                         memset(data, 0, tocopy);
2137                 else {
2138                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2139                         if (!bh)
2140                                 return -EIO;
2141                         memcpy(data, bh->b_data + offset, tocopy);
2142                         brelse(bh);
2143                 }
2144                 offset = 0;
2145                 toread -= tocopy;
2146                 data += tocopy;
2147                 blk++;
2148         }
2149         return len;
2150 }
2151
2152 /* Write to quotafile (we know the transaction is already started and has
2153  * enough credits) */
2154 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2155                                     const char *data, size_t len, loff_t off)
2156 {
2157         struct inode *inode = sb_dqopt(sb)->files[type];
2158         unsigned long blk = off >> sb->s_blocksize_bits;
2159         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2160         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2161         size_t towrite = len;
2162         struct buffer_head tmp_bh, *bh;
2163
2164         if (!current->journal_info) {
2165                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2166                         " cancelled because transaction is not started.\n",
2167                         (unsigned long long)off, (unsigned long long)len);
2168                 return -EIO;
2169         }
2170         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2171         while (towrite > 0) {
2172                 tocopy = sb->s_blocksize - offset < towrite ?
2173                     sb->s_blocksize - offset : towrite;
2174                 tmp_bh.b_state = 0;
2175                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2176                 if (err)
2177                         goto out;
2178                 if (offset || tocopy != sb->s_blocksize)
2179                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2180                 else
2181                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2182                 if (!bh) {
2183                         err = -EIO;
2184                         goto out;
2185                 }
2186                 lock_buffer(bh);
2187                 memcpy(bh->b_data + offset, data, tocopy);
2188                 flush_dcache_page(bh->b_page);
2189                 set_buffer_uptodate(bh);
2190                 unlock_buffer(bh);
2191                 reiserfs_prepare_for_journal(sb, bh, 1);
2192                 journal_mark_dirty(current->journal_info, sb, bh);
2193                 if (!journal_quota)
2194                         reiserfs_add_ordered_list(inode, bh);
2195                 brelse(bh);
2196                 offset = 0;
2197                 towrite -= tocopy;
2198                 data += tocopy;
2199                 blk++;
2200         }
2201 out:
2202         if (len == towrite) {
2203                 mutex_unlock(&inode->i_mutex);
2204                 return err;
2205         }
2206         if (inode->i_size < off + len - towrite)
2207                 i_size_write(inode, off + len - towrite);
2208         inode->i_version++;
2209         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2210         mark_inode_dirty(inode);
2211         mutex_unlock(&inode->i_mutex);
2212         return len - towrite;
2213 }
2214
2215 #endif
2216
2217 static struct dentry *get_super_block(struct file_system_type *fs_type,
2218                            int flags, const char *dev_name,
2219                            void *data)
2220 {
2221         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2222 }
2223
2224 static int __init init_reiserfs_fs(void)
2225 {
2226         int ret;
2227
2228         if ((ret = init_inodecache())) {
2229                 return ret;
2230         }
2231
2232         reiserfs_proc_info_global_init();
2233
2234         ret = register_filesystem(&reiserfs_fs_type);
2235
2236         if (ret == 0) {
2237                 return 0;
2238         }
2239
2240         reiserfs_proc_info_global_done();
2241         destroy_inodecache();
2242
2243         return ret;
2244 }
2245
2246 static void __exit exit_reiserfs_fs(void)
2247 {
2248         reiserfs_proc_info_global_done();
2249         unregister_filesystem(&reiserfs_fs_type);
2250         destroy_inodecache();
2251 }
2252
2253 struct file_system_type reiserfs_fs_type = {
2254         .owner = THIS_MODULE,
2255         .name = "reiserfs",
2256         .mount = get_super_block,
2257         .kill_sb = reiserfs_kill_sb,
2258         .fs_flags = FS_REQUIRES_DEV,
2259 };
2260
2261 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2262 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2263 MODULE_LICENSE("GPL");
2264
2265 module_init(init_reiserfs_fs);
2266 module_exit(exit_reiserfs_fs);