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