fs/reiserfs/super.c

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