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