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