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