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 "reiserfs.h"
  20 #include "acl.h"
  21 #include "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/seq_file.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         /*
  71          * Writeback quota in non-journalled quota case - journalled quota has
  72          * no dirty dquots
  73          */
  74         dquot_writeback_dquots(s, -1);
  75         reiserfs_write_lock(s);
  76         if (!journal_begin(&th, s, 1))
  77                 if (!journal_end_sync(&th, s, 1))
  78                         reiserfs_flush_old_commits(s);
  79         reiserfs_write_unlock(s);
  80         return 0;
  81 }
  82
  83 static void flush_old_commits(struct work_struct *work)
  84 {
  85         struct reiserfs_sb_info *sbi;
  86         struct super_block *s;
  87
  88         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  89         s = sbi->s_journal->j_work_sb;
  90
  91         spin_lock(&sbi->old_work_lock);
  92         sbi->work_queued = 0;
  93         spin_unlock(&sbi->old_work_lock);
  94
  95         reiserfs_sync_fs(s, 1);
  96 }
  97
  98 void reiserfs_schedule_old_flush(struct super_block *s)
  99 {
 100         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 101         unsigned long delay;
 102
 103         if (s->s_flags & MS_RDONLY)
 104                 return;
 105
 106         spin_lock(&sbi->old_work_lock);
 107         if (!sbi->work_queued) {
 108                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 109                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 110                 sbi->work_queued = 1;
 111         }
 112         spin_unlock(&sbi->old_work_lock);
 113 }
 114
 115 static void cancel_old_flush(struct super_block *s)
 116 {
 117         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 118
 119         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 120         spin_lock(&sbi->old_work_lock);
 121         sbi->work_queued = 0;
 122         spin_unlock(&sbi->old_work_lock);
 123 }
 124
 125 static int reiserfs_freeze(struct super_block *s)
 126 {
 127         struct reiserfs_transaction_handle th;
 128
 129         cancel_old_flush(s);
 130
 131         reiserfs_write_lock(s);
 132         if (!(s->s_flags & MS_RDONLY)) {
 133                 int err = journal_begin(&th, s, 1);
 134                 if (err) {
 135                         reiserfs_block_writes(&th);
 136                 } else {
 137                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 138                                                      1);
 139                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 140                         reiserfs_block_writes(&th);
 141                         journal_end_sync(&th, s, 1);
 142                 }
 143         }
 144         reiserfs_write_unlock(s);
 145         return 0;
 146 }
 147
 148 static int reiserfs_unfreeze(struct super_block *s)
 149 {
 150         reiserfs_allow_writes(s);
 151         return 0;
 152 }
 153
 154 extern const struct in_core_key MAX_IN_CORE_KEY;
 155
 156 /* this is used to delete "save link" when there are no items of a
 157    file it points to. It can either happen if unlink is completed but
 158    "save unlink" removal, or if file has both unlink and truncate
 159    pending and as unlink completes first (because key of "save link"
 160    protecting unlink is bigger that a key lf "save link" which
 161    protects truncate), so there left no items to make truncate
 162    completion on */
 163 static int remove_save_link_only(struct super_block *s,
 164                                  struct reiserfs_key *key, int oid_free)
 165 {
 166         struct reiserfs_transaction_handle th;
 167         int err;
 168
 169         /* we are going to do one balancing */
 170         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 171         if (err)
 172                 return err;
 173
 174         reiserfs_delete_solid_item(&th, NULL, key);
 175         if (oid_free)
 176                 /* removals are protected by direct items */
 177                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 178
 179         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 180 }
 181
 182 #ifdef CONFIG_QUOTA
 183 static int reiserfs_quota_on_mount(struct super_block *, int);
 184 #endif
 185
 186 /* look for uncompleted unlinks and truncates and complete them */
 187 static int finish_unfinished(struct super_block *s)
 188 {
 189         INITIALIZE_PATH(path);
 190         struct cpu_key max_cpu_key, obj_key;
 191         struct reiserfs_key save_link_key, last_inode_key;
 192         int retval = 0;
 193         struct item_head *ih;
 194         struct buffer_head *bh;
 195         int item_pos;
 196         char *item;
 197         int done;
 198         struct inode *inode;
 199         int truncate;
 200 #ifdef CONFIG_QUOTA
 201         int i;
 202         int ms_active_set;
 203         int quota_enabled[MAXQUOTAS];
 204 #endif
 205
 206         /* compose key to look for "save" links */
 207         max_cpu_key.version = KEY_FORMAT_3_5;
 208         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 209         max_cpu_key.on_disk_key.k_objectid = ~0U;
 210         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 211         max_cpu_key.key_length = 3;
 212
 213         memset(&last_inode_key, 0, sizeof(last_inode_key));
 214
 215 #ifdef CONFIG_QUOTA
 216         /* Needed for iput() to work correctly and not trash data */
 217         if (s->s_flags & MS_ACTIVE) {
 218                 ms_active_set = 0;
 219         } else {
 220                 ms_active_set = 1;
 221                 s->s_flags |= MS_ACTIVE;
 222         }
 223         /* Turn on quotas so that they are updated correctly */
 224         for (i = 0; i < MAXQUOTAS; i++) {
 225                 quota_enabled[i] = 1;
 226                 if (REISERFS_SB(s)->s_qf_names[i]) {
 227                         int ret;
 228
 229                         if (sb_has_quota_active(s, i)) {
 230                                 quota_enabled[i] = 0;
 231                                 continue;
 232                         }
 233                         ret = reiserfs_quota_on_mount(s, i);
 234                         if (ret < 0)
 235                                 reiserfs_warning(s, "reiserfs-2500",
 236                                                  "cannot turn on journaled "
 237                                                  "quota: error %d", ret);
 238                 }
 239         }
 240 #endif
 241
 242         done = 0;
 243         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 244         while (!retval) {
 245                 int depth;
 246                 retval = search_item(s, &max_cpu_key, &path);
 247                 if (retval != ITEM_NOT_FOUND) {
 248                         reiserfs_error(s, "vs-2140",
 249                                        "search_by_key returned %d", retval);
 250                         break;
 251                 }
 252
 253                 bh = get_last_bh(&path);
 254                 item_pos = get_item_pos(&path);
 255                 if (item_pos != B_NR_ITEMS(bh)) {
 256                         reiserfs_warning(s, "vs-2060",
 257                                          "wrong position found");
 258                         break;
 259                 }
 260                 item_pos--;
 261                 ih = B_N_PITEM_HEAD(bh, item_pos);
 262
 263                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 264                         /* there are no "save" links anymore */
 265                         break;
 266
 267                 save_link_key = ih->ih_key;
 268                 if (is_indirect_le_ih(ih))
 269                         truncate = 1;
 270                 else
 271                         truncate = 0;
 272
 273                 /* reiserfs_iget needs k_dirid and k_objectid only */
 274                 item = B_I_PITEM(bh, ih);
 275                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 276                 obj_key.on_disk_key.k_objectid =
 277                     le32_to_cpu(ih->ih_key.k_objectid);
 278                 obj_key.on_disk_key.k_offset = 0;
 279                 obj_key.on_disk_key.k_type = 0;
 280
 281                 pathrelse(&path);
 282
 283                 inode = reiserfs_iget(s, &obj_key);
 284                 if (!inode) {
 285                         /* the unlink almost completed, it just did not manage to remove
 286                            "save" link and release objectid */
 287                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 288                                          &obj_key);
 289                         retval = remove_save_link_only(s, &save_link_key, 1);
 290                         continue;
 291                 }
 292
 293                 if (!truncate && inode->i_nlink) {
 294                         /* file is not unlinked */
 295                         reiserfs_warning(s, "vs-2185",
 296                                          "file %K is not unlinked",
 297                                          &obj_key);
 298                         retval = remove_save_link_only(s, &save_link_key, 0);
 299                         continue;
 300                 }
 301                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 302                 dquot_initialize(inode);
 303                 reiserfs_write_lock_nested(inode->i_sb, depth);
 304
 305                 if (truncate && S_ISDIR(inode->i_mode)) {
 306                         /* We got a truncate request for a dir which is impossible.
 307                            The only imaginable way is to execute unfinished truncate request
 308                            then boot into old kernel, remove the file and create dir with
 309                            the same key. */
 310                         reiserfs_warning(s, "green-2101",
 311                                          "impossible truncate on a "
 312                                          "directory %k. Please report",
 313                                          INODE_PKEY(inode));
 314                         retval = remove_save_link_only(s, &save_link_key, 0);
 315                         truncate = 0;
 316                         iput(inode);
 317                         continue;
 318                 }
 319
 320                 if (truncate) {
 321                         REISERFS_I(inode)->i_flags |=
 322                             i_link_saved_truncate_mask;
 323                         /* not completed truncate found. New size was committed together
 324                            with "save" link */
 325                         reiserfs_info(s, "Truncating %k to %Ld ..",
 326                                       INODE_PKEY(inode), inode->i_size);
 327                         reiserfs_truncate_file(inode,
 328                                                0
 329                                                /*don't update modification time */
 330                                                );
 331                         retval = remove_save_link(inode, truncate);
 332                 } else {
 333                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 334                         /* not completed unlink (rmdir) found */
 335                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 336                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 337                                         sizeof(last_inode_key))){
 338                                 last_inode_key = *INODE_PKEY(inode);
 339                                 /* removal gets completed in iput */
 340                                 retval = 0;
 341                         } else {
 342                                 reiserfs_warning(s, "super-2189", "Dead loop "
 343                                                  "in finish_unfinished "
 344                                                  "detected, just remove "
 345                                                  "save link\n");
 346                                 retval = remove_save_link_only(s,
 347                                                         &save_link_key, 0);
 348                         }
 349                 }
 350
 351                 iput(inode);
 352                 printk("done\n");
 353                 done++;
 354         }
 355         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 356
 357 #ifdef CONFIG_QUOTA
 358         /* Turn quotas off */
 359         reiserfs_write_unlock(s);
 360         for (i = 0; i < MAXQUOTAS; i++) {
 361                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 362                         dquot_quota_off(s, i);
 363         }
 364         reiserfs_write_lock(s);
 365         if (ms_active_set)
 366                 /* Restore the flag back */
 367                 s->s_flags &= ~MS_ACTIVE;
 368 #endif
 369         pathrelse(&path);
 370         if (done)
 371                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 372                               "Completed\n", done);
 373         return retval;
 374 }
 375
 376 /* to protect file being unlinked from getting lost we "safe" link files
 377    being unlinked. This link will be deleted in the same transaction with last
 378    item of file. mounting the filesystem we scan all these links and remove
 379    files which almost got lost */
 380 void add_save_link(struct reiserfs_transaction_handle *th,
 381                    struct inode *inode, int truncate)
 382 {
 383         INITIALIZE_PATH(path);
 384         int retval;
 385         struct cpu_key key;
 386         struct item_head ih;
 387         __le32 link;
 388
 389         BUG_ON(!th->t_trans_id);
 390
 391         /* file can only get one "save link" of each kind */
 392         RFALSE(truncate &&
 393                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 394                "saved link already exists for truncated inode %lx",
 395                (long)inode->i_ino);
 396         RFALSE(!truncate &&
 397                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 398                "saved link already exists for unlinked inode %lx",
 399                (long)inode->i_ino);
 400
 401         /* setup key of "save" link */
 402         key.version = KEY_FORMAT_3_5;
 403         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 404         key.on_disk_key.k_objectid = inode->i_ino;
 405         if (!truncate) {
 406                 /* unlink, rmdir, rename */
 407                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 408                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 409
 410                 /* item head of "safe" link */
 411                 make_le_item_head(&ih, &key, key.version,
 412                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 413                                   4 /*length */ , 0xffff /*free space */ );
 414         } else {
 415                 /* truncate */
 416                 if (S_ISDIR(inode->i_mode))
 417                         reiserfs_warning(inode->i_sb, "green-2102",
 418                                          "Adding a truncate savelink for "
 419                                          "a directory %k! Please report",
 420                                          INODE_PKEY(inode));
 421                 set_cpu_key_k_offset(&key, 1);
 422                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 423
 424                 /* item head of "safe" link */
 425                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 426                                   4 /*length */ , 0 /*free space */ );
 427         }
 428         key.key_length = 3;
 429
 430         /* look for its place in the tree */
 431         retval = search_item(inode->i_sb, &key, &path);
 432         if (retval != ITEM_NOT_FOUND) {
 433                 if (retval != -ENOSPC)
 434                         reiserfs_error(inode->i_sb, "vs-2100",
 435                                        "search_by_key (%K) returned %d", &key,
 436                                        retval);
 437                 pathrelse(&path);
 438                 return;
 439         }
 440
 441         /* body of "save" link */
 442         link = INODE_PKEY(inode)->k_dir_id;
 443
 444         /* put "save" link into tree, don't charge quota to anyone */
 445         retval =
 446             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 447         if (retval) {
 448                 if (retval != -ENOSPC)
 449                         reiserfs_error(inode->i_sb, "vs-2120",
 450                                        "insert_item returned %d", retval);
 451         } else {
 452                 if (truncate)
 453                         REISERFS_I(inode)->i_flags |=
 454                             i_link_saved_truncate_mask;
 455                 else
 456                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 457         }
 458 }
 459
 460 /* this opens transaction unlike add_save_link */
 461 int remove_save_link(struct inode *inode, int truncate)
 462 {
 463         struct reiserfs_transaction_handle th;
 464         struct reiserfs_key key;
 465         int err;
 466
 467         /* we are going to do one balancing only */
 468         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 469         if (err)
 470                 return err;
 471
 472         /* setup key of "save" link */
 473         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 474         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 475         if (!truncate) {
 476                 /* unlink, rmdir, rename */
 477                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 478                                     1 + inode->i_sb->s_blocksize);
 479                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 480         } else {
 481                 /* truncate */
 482                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 483                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 484         }
 485
 486         if ((truncate &&
 487              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 488             (!truncate &&
 489              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 490                 /* don't take quota bytes from anywhere */
 491                 reiserfs_delete_solid_item(&th, NULL, &key);
 492         if (!truncate) {
 493                 reiserfs_release_objectid(&th, inode->i_ino);
 494                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 495         } else
 496                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 497
 498         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 499 }
 500
 501 static void reiserfs_kill_sb(struct super_block *s)
 502 {
 503         if (REISERFS_SB(s)) {
 504                 reiserfs_proc_info_done(s);
 505                 /*
 506                  * Force any pending inode evictions to occur now. Any
 507                  * inodes to be removed that have extended attributes
 508                  * associated with them need to clean them up before
 509                  * we can release the extended attribute root dentries.
 510                  * shrink_dcache_for_umount will BUG if we don't release
 511                  * those before it's called so ->put_super is too late.
 512                  */
 513                 shrink_dcache_sb(s);
 514
 515                 dput(REISERFS_SB(s)->xattr_root);
 516                 REISERFS_SB(s)->xattr_root = NULL;
 517                 dput(REISERFS_SB(s)->priv_root);
 518                 REISERFS_SB(s)->priv_root = NULL;
 519         }
 520
 521         kill_block_super(s);
 522 }
 523
 524 static void reiserfs_put_super(struct super_block *s)
 525 {
 526         struct reiserfs_transaction_handle th;
 527         th.t_trans_id = 0;
 528
 529         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 530
 531         reiserfs_write_lock(s);
 532
 533         /* change file system state to current state if it was mounted with read-write permissions */
 534         if (!(s->s_flags & MS_RDONLY)) {
 535                 if (!journal_begin(&th, s, 10)) {
 536                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 537                                                      1);
 538                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 539                                             REISERFS_SB(s)->s_mount_state);
 540                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 541                 }
 542         }
 543
 544         /* note, journal_release checks for readonly mount, and can decide not
 545          ** to do a journal_end
 546          */
 547         journal_release(&th, s);
 548
 549         reiserfs_free_bitmap_cache(s);
 550
 551         brelse(SB_BUFFER_WITH_SB(s));
 552
 553         print_statistics(s);
 554
 555         if (REISERFS_SB(s)->reserved_blocks != 0) {
 556                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 557                                  REISERFS_SB(s)->reserved_blocks);
 558         }
 559
 560         reiserfs_write_unlock(s);
 561         mutex_destroy(&REISERFS_SB(s)->lock);
 562         kfree(s->s_fs_info);
 563         s->s_fs_info = NULL;
 564 }
 565
 566 static struct kmem_cache *reiserfs_inode_cachep;
 567
 568 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 569 {
 570         struct reiserfs_inode_info *ei;
 571         ei = (struct reiserfs_inode_info *)
 572             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 573         if (!ei)
 574                 return NULL;
 575         atomic_set(&ei->openers, 0);
 576         mutex_init(&ei->tailpack);
 577         return &ei->vfs_inode;
 578 }
 579
 580 static void reiserfs_i_callback(struct rcu_head *head)
 581 {
 582         struct inode *inode = container_of(head, struct inode, i_rcu);
 583         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 584 }
 585
 586 static void reiserfs_destroy_inode(struct inode *inode)
 587 {
 588         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 589 }
 590
 591 static void init_once(void *foo)
 592 {
 593         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 594
 595         INIT_LIST_HEAD(&ei->i_prealloc_list);
 596         inode_init_once(&ei->vfs_inode);
 597 }
 598
 599 static int __init init_inodecache(void)
 600 {
 601         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 602                                                   sizeof(struct
 603                                                          reiserfs_inode_info),
 604                                                   0, (SLAB_RECLAIM_ACCOUNT|
 605                                                         SLAB_MEM_SPREAD),
 606                                                   init_once);
 607         if (reiserfs_inode_cachep == NULL)
 608                 return -ENOMEM;
 609         return 0;
 610 }
 611
 612 static void destroy_inodecache(void)
 613 {
 614         /*
 615          * Make sure all delayed rcu free inodes are flushed before we
 616          * destroy cache.
 617          */
 618         rcu_barrier();
 619         kmem_cache_destroy(reiserfs_inode_cachep);
 620 }
 621
 622 /* we don't mark inodes dirty, we just log them */
 623 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 624 {
 625         struct reiserfs_transaction_handle th;
 626
 627         int err = 0;
 628
 629         if (inode->i_sb->s_flags & MS_RDONLY) {
 630                 reiserfs_warning(inode->i_sb, "clm-6006",
 631                                  "writing inode %lu on readonly FS",
 632                                  inode->i_ino);
 633                 return;
 634         }
 635         reiserfs_write_lock(inode->i_sb);
 636
 637         /* this is really only used for atime updates, so they don't have
 638          ** to be included in O_SYNC or fsync
 639          */
 640         err = journal_begin(&th, inode->i_sb, 1);
 641         if (err)
 642                 goto out;
 643
 644         reiserfs_update_sd(&th, inode);
 645         journal_end(&th, inode->i_sb, 1);
 646
 647 out:
 648         reiserfs_write_unlock(inode->i_sb);
 649 }
 650
 651 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 652 {
 653         struct super_block *s = root->d_sb;
 654         struct reiserfs_journal *journal = SB_JOURNAL(s);
 655         long opts = REISERFS_SB(s)->s_mount_opt;
 656
 657         if (opts & (1 << REISERFS_LARGETAIL))
 658                 seq_puts(seq, ",tails=on");
 659         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 660                 seq_puts(seq, ",notail");
 661         /* tails=small is default so we don't show it */
 662
 663         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 664                 seq_puts(seq, ",barrier=none");
 665         /* barrier=flush is default so we don't show it */
 666
 667         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 668                 seq_puts(seq, ",errors=continue");
 669         else if (opts & (1 << REISERFS_ERROR_PANIC))
 670                 seq_puts(seq, ",errors=panic");
 671         /* errors=ro is default so we don't show it */
 672
 673         if (opts & (1 << REISERFS_DATA_LOG))
 674                 seq_puts(seq, ",data=journal");
 675         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 676                 seq_puts(seq, ",data=writeback");
 677         /* data=ordered is default so we don't show it */
 678
 679         if (opts & (1 << REISERFS_ATTRS))
 680                 seq_puts(seq, ",attrs");
 681
 682         if (opts & (1 << REISERFS_XATTRS_USER))
 683                 seq_puts(seq, ",user_xattr");
 684
 685         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 686                 seq_puts(seq, ",expose_privroot");
 687
 688         if (opts & (1 << REISERFS_POSIXACL))
 689                 seq_puts(seq, ",acl");
 690
 691         if (REISERFS_SB(s)->s_jdev)
 692                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 693
 694         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 695                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 696
 697 #ifdef CONFIG_QUOTA
 698         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 699                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 700         else if (opts & (1 << REISERFS_USRQUOTA))
 701                 seq_puts(seq, ",usrquota");
 702         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 703                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 704         else if (opts & (1 << REISERFS_GRPQUOTA))
 705                 seq_puts(seq, ",grpquota");
 706         if (REISERFS_SB(s)->s_jquota_fmt) {
 707                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 708                         seq_puts(seq, ",jqfmt=vfsold");
 709                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 710                         seq_puts(seq, ",jqfmt=vfsv0");
 711         }
 712 #endif
 713
 714         /* Block allocator options */
 715         if (opts & (1 << REISERFS_NO_BORDER))
 716                 seq_puts(seq, ",block-allocator=noborder");
 717         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 718                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 719         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 720                 seq_puts(seq, ",block-allocator=hashed_relocation");
 721         if (opts & (1 << REISERFS_TEST4))
 722                 seq_puts(seq, ",block-allocator=test4");
 723         show_alloc_options(seq, s);
 724         return 0;
 725 }
 726
 727 #ifdef CONFIG_QUOTA
 728 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 729                                     size_t, loff_t);
 730 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 731                                    loff_t);
 732 #endif
 733
 734 static const struct super_operations reiserfs_sops = {
 735         .alloc_inode = reiserfs_alloc_inode,
 736         .destroy_inode = reiserfs_destroy_inode,
 737         .write_inode = reiserfs_write_inode,
 738         .dirty_inode = reiserfs_dirty_inode,
 739         .evict_inode = reiserfs_evict_inode,
 740         .put_super = reiserfs_put_super,
 741         .sync_fs = reiserfs_sync_fs,
 742         .freeze_fs = reiserfs_freeze,
 743         .unfreeze_fs = reiserfs_unfreeze,
 744         .statfs = reiserfs_statfs,
 745         .remount_fs = reiserfs_remount,
 746         .show_options = reiserfs_show_options,
 747 #ifdef CONFIG_QUOTA
 748         .quota_read = reiserfs_quota_read,
 749         .quota_write = reiserfs_quota_write,
 750 #endif
 751 };
 752
 753 #ifdef CONFIG_QUOTA
 754 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 755
 756 static int reiserfs_write_dquot(struct dquot *);
 757 static int reiserfs_acquire_dquot(struct dquot *);
 758 static int reiserfs_release_dquot(struct dquot *);
 759 static int reiserfs_mark_dquot_dirty(struct dquot *);
 760 static int reiserfs_write_info(struct super_block *, int);
 761 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 762
 763 static const struct dquot_operations reiserfs_quota_operations = {
 764         .write_dquot = reiserfs_write_dquot,
 765         .acquire_dquot = reiserfs_acquire_dquot,
 766         .release_dquot = reiserfs_release_dquot,
 767         .mark_dirty = reiserfs_mark_dquot_dirty,
 768         .write_info = reiserfs_write_info,
 769         .alloc_dquot    = dquot_alloc,
 770         .destroy_dquot  = dquot_destroy,
 771 };
 772
 773 static const struct quotactl_ops reiserfs_qctl_operations = {
 774         .quota_on = reiserfs_quota_on,
 775         .quota_off = dquot_quota_off,
 776         .quota_sync = dquot_quota_sync,
 777         .get_info = dquot_get_dqinfo,
 778         .set_info = dquot_set_dqinfo,
 779         .get_dqblk = dquot_get_dqblk,
 780         .set_dqblk = dquot_set_dqblk,
 781 };
 782 #endif
 783
 784 static const struct export_operations reiserfs_export_ops = {
 785         .encode_fh = reiserfs_encode_fh,
 786         .fh_to_dentry = reiserfs_fh_to_dentry,
 787         .fh_to_parent = reiserfs_fh_to_parent,
 788         .get_parent = reiserfs_get_parent,
 789 };
 790
 791 /* this struct is used in reiserfs_getopt () for containing the value for those
 792    mount options that have values rather than being toggles. */
 793 typedef struct {
 794         char *value;
 795         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 796                                    value is found, 0 is no bits are to be changed. */
 797         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 798                                    value is found, 0 is no bits are to be changed. This is
 799                                    applied BEFORE setmask */
 800 } arg_desc_t;
 801
 802 /* Set this bit in arg_required to allow empty arguments */
 803 #define REISERFS_OPT_ALLOWEMPTY 31
 804
 805 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 806    mount options */
 807 typedef struct {
 808         char *option_name;
 809         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 810         const arg_desc_t *values;       /* list of values accepted by an option */
 811         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 812                                    value is found, 0 is no bits are to be changed. */
 813         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 814                                    value is found, 0 is no bits are to be changed. This is
 815                                    applied BEFORE setmask */
 816 } opt_desc_t;
 817
 818 /* possible values for -o data= */
 819 static const arg_desc_t logging_mode[] = {
 820         {"ordered", 1 << REISERFS_DATA_ORDERED,
 821          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 822         {"journal", 1 << REISERFS_DATA_LOG,
 823          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 824         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 825          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 826         {.value = NULL}
 827 };
 828
 829 /* possible values for -o barrier= */
 830 static const arg_desc_t barrier_mode[] = {
 831         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 832         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 833         {.value = NULL}
 834 };
 835
 836 /* possible values for "-o block-allocator=" and bits which are to be set in
 837    s_mount_opt of reiserfs specific part of in-core super block */
 838 static const arg_desc_t balloc[] = {
 839         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 840         {"border", 0, 1 << REISERFS_NO_BORDER},
 841         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 842         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 843         {"test4", 1 << REISERFS_TEST4, 0},
 844         {"notest4", 0, 1 << REISERFS_TEST4},
 845         {NULL, 0, 0}
 846 };
 847
 848 static const arg_desc_t tails[] = {
 849         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 850         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 851         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 852         {NULL, 0, 0}
 853 };
 854
 855 static const arg_desc_t error_actions[] = {
 856         {"panic", 1 << REISERFS_ERROR_PANIC,
 857          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 858         {"ro-remount", 1 << REISERFS_ERROR_RO,
 859          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 860 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 861         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 862          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 863 #endif
 864         {NULL, 0, 0},
 865 };
 866
 867 /* proceed only one option from a list *cur - string containing of mount options
 868    opts - array of options which are accepted
 869    opt_arg - if option is found and requires an argument and if it is specifed
 870    in the input - pointer to the argument is stored here
 871    bit_flags - if option requires to set a certain bit - it is set here
 872    return -1 if unknown option is found, opt->arg_required otherwise */
 873 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 874                            char **opt_arg, unsigned long *bit_flags)
 875 {
 876         char *p;
 877         /* foo=bar,
 878            ^   ^  ^
 879            |   |  +-- option_end
 880            |   +-- arg_start
 881            +-- option_start
 882          */
 883         const opt_desc_t *opt;
 884         const arg_desc_t *arg;
 885
 886         p = *cur;
 887
 888         /* assume argument cannot contain commas */
 889         *cur = strchr(p, ',');
 890         if (*cur) {
 891                 *(*cur) = '\0';
 892                 (*cur)++;
 893         }
 894
 895         if (!strncmp(p, "alloc=", 6)) {
 896                 /* Ugly special case, probably we should redo options parser so that
 897                    it can understand several arguments for some options, also so that
 898                    it can fill several bitfields with option values. */
 899                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 900                         return -1;
 901                 } else {
 902                         return 0;
 903                 }
 904         }
 905
 906         /* for every option in the list */
 907         for (opt = opts; opt->option_name; opt++) {
 908                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 909                         if (bit_flags) {
 910                                 if (opt->clrmask ==
 911                                     (1 << REISERFS_UNSUPPORTED_OPT))
 912                                         reiserfs_warning(s, "super-6500",
 913                                                          "%s not supported.\n",
 914                                                          p);
 915                                 else
 916                                         *bit_flags &= ~opt->clrmask;
 917                                 if (opt->setmask ==
 918                                     (1 << REISERFS_UNSUPPORTED_OPT))
 919                                         reiserfs_warning(s, "super-6501",
 920                                                          "%s not supported.\n",
 921                                                          p);
 922                                 else
 923                                         *bit_flags |= opt->setmask;
 924                         }
 925                         break;
 926                 }
 927         }
 928         if (!opt->option_name) {
 929                 reiserfs_warning(s, "super-6502",
 930                                  "unknown mount option \"%s\"", p);
 931                 return -1;
 932         }
 933
 934         p += strlen(opt->option_name);
 935         switch (*p) {
 936         case '=':
 937                 if (!opt->arg_required) {
 938                         reiserfs_warning(s, "super-6503",
 939                                          "the option \"%s\" does not "
 940                                          "require an argument\n",
 941                                          opt->option_name);
 942                         return -1;
 943                 }
 944                 break;
 945
 946         case 0:
 947                 if (opt->arg_required) {
 948                         reiserfs_warning(s, "super-6504",
 949                                          "the option \"%s\" requires an "
 950                                          "argument\n", opt->option_name);
 951                         return -1;
 952                 }
 953                 break;
 954         default:
 955                 reiserfs_warning(s, "super-6505",
 956                                  "head of option \"%s\" is only correct\n",
 957                                  opt->option_name);
 958                 return -1;
 959         }
 960
 961         /* move to the argument, or to next option if argument is not required */
 962         p++;
 963
 964         if (opt->arg_required
 965             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 966             && !strlen(p)) {
 967                 /* this catches "option=," if not allowed */
 968                 reiserfs_warning(s, "super-6506",
 969                                  "empty argument for \"%s\"\n",
 970                                  opt->option_name);
 971                 return -1;
 972         }
 973
 974         if (!opt->values) {
 975                 /* *=NULLopt_arg contains pointer to argument */
 976                 *opt_arg = p;
 977                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 978         }
 979
 980         /* values possible for this option are listed in opt->values */
 981         for (arg = opt->values; arg->value; arg++) {
 982                 if (!strcmp(p, arg->value)) {
 983                         if (bit_flags) {
 984                                 *bit_flags &= ~arg->clrmask;
 985                                 *bit_flags |= arg->setmask;
 986                         }
 987                         return opt->arg_required;
 988                 }
 989         }
 990
 991         reiserfs_warning(s, "super-6506",
 992                          "bad value \"%s\" for option \"%s\"\n", p,
 993                          opt->option_name);
 994         return -1;
 995 }
 996
 997 /* returns 0 if something is wrong in option string, 1 - otherwise */
 998 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 999                                   unsigned long *mount_options,
1000                                   /* after the parsing phase, contains the
1001                                      collection of bitflags defining what
1002                                      mount options were selected. */
1003                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
1004                                   char **jdev_name,
1005                                   unsigned int *commit_max_age,
1006                                   char **qf_names,
1007                                   unsigned int *qfmt)
1008 {
1009         int c;
1010         char *arg = NULL;
1011         char *pos;
1012         opt_desc_t opts[] = {
1013                 /* Compatibility stuff, so that -o notail for old setups still work */
1014                 {"tails",.arg_required = 't',.values = tails},
1015                 {"notail",.clrmask =
1016                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1017                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1018                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1019                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1020                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1021 #ifdef CONFIG_REISERFS_FS_XATTR
1022                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1023                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1024 #else
1025                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027 #endif
1028 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1029                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1030                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1031 #else
1032                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034 #endif
1035                 {.option_name = "nolog"},
1036                 {"replayonly",.setmask = 1 << REPLAYONLY},
1037                 {"block-allocator",.arg_required = 'a',.values = balloc},
1038                 {"data",.arg_required = 'd',.values = logging_mode},
1039                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1040                 {"resize",.arg_required = 'r',.values = NULL},
1041                 {"jdev",.arg_required = 'j',.values = NULL},
1042                 {"nolargeio",.arg_required = 'w',.values = NULL},
1043                 {"commit",.arg_required = 'c',.values = NULL},
1044                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1045                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1046                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1047                 {"errors",.arg_required = 'e',.values = error_actions},
1048                 {"usrjquota",.arg_required =
1049                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050                 {"grpjquota",.arg_required =
1051                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1052                 {"jqfmt",.arg_required = 'f',.values = NULL},
1053                 {.option_name = NULL}
1054         };
1055
1056         *blocks = 0;
1057         if (!options || !*options)
1058                 /* use default configuration: create tails, journaling on, no
1059                    conversion to newest format */
1060                 return 1;
1061
1062         for (pos = options; pos;) {
1063                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1064                 if (c == -1)
1065                         /* wrong option is given */
1066                         return 0;
1067
1068                 if (c == 'r') {
1069                         char *p;
1070
1071                         p = NULL;
1072                         /* "resize=NNN" or "resize=auto" */
1073
1074                         if (!strcmp(arg, "auto")) {
1075                                 /* From JFS code, to auto-get the size. */
1076                                 *blocks =
1077                                     s->s_bdev->bd_inode->i_size >> s->
1078                                     s_blocksize_bits;
1079                         } else {
1080                                 *blocks = simple_strtoul(arg, &p, 0);
1081                                 if (*p != '\0') {
1082                                         /* NNN does not look like a number */
1083                                         reiserfs_warning(s, "super-6507",
1084                                                          "bad value %s for "
1085                                                          "-oresize\n", arg);
1086                                         return 0;
1087                                 }
1088                         }
1089                 }
1090
1091                 if (c == 'c') {
1092                         char *p = NULL;
1093                         unsigned long val = simple_strtoul(arg, &p, 0);
1094                         /* commit=NNN (time in seconds) */
1095                         if (*p != '\0' || val >= (unsigned int)-1) {
1096                                 reiserfs_warning(s, "super-6508",
1097                                                  "bad value %s for -ocommit\n",
1098                                                  arg);
1099                                 return 0;
1100                         }
1101                         *commit_max_age = (unsigned int)val;
1102                 }
1103
1104                 if (c == 'w') {
1105                         reiserfs_warning(s, "super-6509", "nolargeio option "
1106                                          "is no longer supported");
1107                         return 0;
1108                 }
1109
1110                 if (c == 'j') {
1111                         if (arg && *arg && jdev_name) {
1112                                 if (*jdev_name) {       //Hm, already assigned?
1113                                         reiserfs_warning(s, "super-6510",
1114                                                          "journal device was "
1115                                                          "already specified to "
1116                                                          "be %s", *jdev_name);
1117                                         return 0;
1118                                 }
1119                                 *jdev_name = arg;
1120                         }
1121                 }
1122 #ifdef CONFIG_QUOTA
1123                 if (c == 'u' || c == 'g') {
1124                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1125
1126                         if (sb_any_quota_loaded(s) &&
1127                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1128                                 reiserfs_warning(s, "super-6511",
1129                                                  "cannot change journaled "
1130                                                  "quota options when quota "
1131                                                  "turned on.");
1132                                 return 0;
1133                         }
1134                         if (*arg) {     /* Some filename specified? */
1135                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1136                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1137                                               arg)) {
1138                                         reiserfs_warning(s, "super-6512",
1139                                                          "%s quota file "
1140                                                          "already specified.",
1141                                                          QTYPE2NAME(qtype));
1142                                         return 0;
1143                                 }
1144                                 if (strchr(arg, '/')) {
1145                                         reiserfs_warning(s, "super-6513",
1146                                                          "quotafile must be "
1147                                                          "on filesystem root.");
1148                                         return 0;
1149                                 }
1150                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1151                                 if (!qf_names[qtype]) {
1152                                         reiserfs_warning(s, "reiserfs-2502",
1153                                                          "not enough memory "
1154                                                          "for storing "
1155                                                          "quotafile name.");
1156                                         return 0;
1157                                 }
1158                                 if (qtype == USRQUOTA)
1159                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1160                                 else
1161                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1162                         } else {
1163                                 if (qf_names[qtype] !=
1164                                     REISERFS_SB(s)->s_qf_names[qtype])
1165                                         kfree(qf_names[qtype]);
1166                                 qf_names[qtype] = NULL;
1167                                 if (qtype == USRQUOTA)
1168                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1169                                 else
1170                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1171                         }
1172                 }
1173                 if (c == 'f') {
1174                         if (!strcmp(arg, "vfsold"))
1175                                 *qfmt = QFMT_VFS_OLD;
1176                         else if (!strcmp(arg, "vfsv0"))
1177                                 *qfmt = QFMT_VFS_V0;
1178                         else {
1179                                 reiserfs_warning(s, "super-6514",
1180                                                  "unknown quota format "
1181                                                  "specified.");
1182                                 return 0;
1183                         }
1184                         if (sb_any_quota_loaded(s) &&
1185                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1186                                 reiserfs_warning(s, "super-6515",
1187                                                  "cannot change journaled "
1188                                                  "quota options when quota "
1189                                                  "turned on.");
1190                                 return 0;
1191                         }
1192                 }
1193 #else
1194                 if (c == 'u' || c == 'g' || c == 'f') {
1195                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1196                                          "quota options not supported.");
1197                         return 0;
1198                 }
1199 #endif
1200         }
1201
1202 #ifdef CONFIG_QUOTA
1203         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1204             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1205                 reiserfs_warning(s, "super-6515",
1206                                  "journaled quota format not specified.");
1207                 return 0;
1208         }
1209         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1210                sb_has_quota_loaded(s, USRQUOTA)) ||
1211             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1212                sb_has_quota_loaded(s, GRPQUOTA))) {
1213                 reiserfs_warning(s, "super-6516", "quota options must "
1214                                  "be present when quota is turned on.");
1215                 return 0;
1216         }
1217 #endif
1218
1219         return 1;
1220 }
1221
1222 static void switch_data_mode(struct super_block *s, unsigned long mode)
1223 {
1224         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1225                                          (1 << REISERFS_DATA_ORDERED) |
1226                                          (1 << REISERFS_DATA_WRITEBACK));
1227         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1228 }
1229
1230 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1231 {
1232         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1233                 if (!reiserfs_data_log(s)) {
1234                         switch_data_mode(s, REISERFS_DATA_LOG);
1235                         reiserfs_info(s, "switching to journaled data mode\n");
1236                 }
1237         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1238                 if (!reiserfs_data_ordered(s)) {
1239                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1240                         reiserfs_info(s, "switching to ordered data mode\n");
1241                 }
1242         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1243                 if (!reiserfs_data_writeback(s)) {
1244                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1245                         reiserfs_info(s, "switching to writeback data mode\n");
1246                 }
1247         }
1248 }
1249
1250 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1251 {
1252         int flush = (1 << REISERFS_BARRIER_FLUSH);
1253         int none = (1 << REISERFS_BARRIER_NONE);
1254         int all_barrier = flush | none;
1255
1256         if (bits & all_barrier) {
1257                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1258                 if (bits & flush) {
1259                         REISERFS_SB(s)->s_mount_opt |= flush;
1260                         printk("reiserfs: enabling write barrier flush mode\n");
1261                 } else if (bits & none) {
1262                         REISERFS_SB(s)->s_mount_opt |= none;
1263                         printk("reiserfs: write barriers turned off\n");
1264                 }
1265         }
1266 }
1267
1268 static void handle_attrs(struct super_block *s)
1269 {
1270         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1271
1272         if (reiserfs_attrs(s)) {
1273                 if (old_format_only(s)) {
1274                         reiserfs_warning(s, "super-6517", "cannot support "
1275                                          "attributes on 3.5.x disk format");
1276                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1277                         return;
1278                 }
1279                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1280                         reiserfs_warning(s, "super-6518", "cannot support "
1281                                          "attributes until flag is set in "
1282                                          "super-block");
1283                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1284                 }
1285         }
1286 }
1287
1288 #ifdef CONFIG_QUOTA
1289 static void handle_quota_files(struct super_block *s, char **qf_names,
1290                                unsigned int *qfmt)
1291 {
1292         int i;
1293
1294         for (i = 0; i < MAXQUOTAS; i++) {
1295                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1296                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1297                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1298         }
1299         if (*qfmt)
1300                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1301 }
1302 #endif
1303
1304 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1305 {
1306         struct reiserfs_super_block *rs;
1307         struct reiserfs_transaction_handle th;
1308         unsigned long blocks;
1309         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1310         unsigned long safe_mask = 0;
1311         unsigned int commit_max_age = (unsigned int)-1;
1312         struct reiserfs_journal *journal = SB_JOURNAL(s);
1313         char *new_opts = kstrdup(arg, GFP_KERNEL);
1314         int err;
1315         char *qf_names[MAXQUOTAS];
1316         unsigned int qfmt = 0;
1317 #ifdef CONFIG_QUOTA
1318         int i;
1319 #endif
1320
1321         sync_filesystem(s);
1322         reiserfs_write_lock(s);
1323
1324 #ifdef CONFIG_QUOTA
1325         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1326 #endif
1327
1328         rs = SB_DISK_SUPER_BLOCK(s);
1329
1330         if (!reiserfs_parse_options
1331             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1332             qf_names, &qfmt)) {
1333 #ifdef CONFIG_QUOTA
1334                 for (i = 0; i < MAXQUOTAS; i++)
1335                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1336                                 kfree(qf_names[i]);
1337 #endif
1338                 err = -EINVAL;
1339                 goto out_err_unlock;
1340         }
1341 #ifdef CONFIG_QUOTA
1342         handle_quota_files(s, qf_names, &qfmt);
1343 #endif
1344
1345         handle_attrs(s);
1346
1347         /* Add options that are safe here */
1348         safe_mask |= 1 << REISERFS_SMALLTAIL;
1349         safe_mask |= 1 << REISERFS_LARGETAIL;
1350         safe_mask |= 1 << REISERFS_NO_BORDER;
1351         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1352         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1353         safe_mask |= 1 << REISERFS_TEST4;
1354         safe_mask |= 1 << REISERFS_ATTRS;
1355         safe_mask |= 1 << REISERFS_XATTRS_USER;
1356         safe_mask |= 1 << REISERFS_POSIXACL;
1357         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1358         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1359         safe_mask |= 1 << REISERFS_ERROR_RO;
1360         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1361         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1362         safe_mask |= 1 << REISERFS_USRQUOTA;
1363         safe_mask |= 1 << REISERFS_GRPQUOTA;
1364
1365         /* Update the bitmask, taking care to keep
1366          * the bits we're not allowed to change here */
1367         REISERFS_SB(s)->s_mount_opt =
1368             (REISERFS_SB(s)->
1369              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1370
1371         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1372                 journal->j_max_commit_age = commit_max_age;
1373                 journal->j_max_trans_age = commit_max_age;
1374         } else if (commit_max_age == 0) {
1375                 /* 0 means restore defaults. */
1376                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1377                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1378         }
1379
1380         if (blocks) {
1381                 err = reiserfs_resize(s, blocks);
1382                 if (err != 0)
1383                         goto out_err_unlock;
1384         }
1385
1386         if (*mount_flags & MS_RDONLY) {
1387                 reiserfs_write_unlock(s);
1388                 reiserfs_xattr_init(s, *mount_flags);
1389                 /* remount read-only */
1390                 if (s->s_flags & MS_RDONLY)
1391                         /* it is read-only already */
1392                         goto out_ok_unlocked;
1393
1394                 err = dquot_suspend(s, -1);
1395                 if (err < 0)
1396                         goto out_err;
1397
1398                 /* try to remount file system with read-only permissions */
1399                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1400                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1401                         goto out_ok_unlocked;
1402                 }
1403
1404                 reiserfs_write_lock(s);
1405
1406                 err = journal_begin(&th, s, 10);
1407                 if (err)
1408                         goto out_err_unlock;
1409
1410                 /* Mounting a rw partition read-only. */
1411                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1412                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1413                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1414         } else {
1415                 /* remount read-write */
1416                 if (!(s->s_flags & MS_RDONLY)) {
1417                         reiserfs_write_unlock(s);
1418                         reiserfs_xattr_init(s, *mount_flags);
1419                         goto out_ok_unlocked;   /* We are read-write already */
1420                 }
1421
1422                 if (reiserfs_is_journal_aborted(journal)) {
1423                         err = journal->j_errno;
1424                         goto out_err_unlock;
1425                 }
1426
1427                 handle_data_mode(s, mount_options);
1428                 handle_barrier_mode(s, mount_options);
1429                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1430                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1431                 err = journal_begin(&th, s, 10);
1432                 if (err)
1433                         goto out_err_unlock;
1434
1435                 /* Mount a partition which is read-only, read-write */
1436                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1437                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1438                 s->s_flags &= ~MS_RDONLY;
1439                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1440                 if (!old_format_only(s))
1441                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1442                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1443                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1444                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1445         }
1446         /* this will force a full flush of all journal lists */
1447         SB_JOURNAL(s)->j_must_wait = 1;
1448         err = journal_end(&th, s, 10);
1449         if (err)
1450                 goto out_err_unlock;
1451
1452         reiserfs_write_unlock(s);
1453         if (!(*mount_flags & MS_RDONLY)) {
1454                 dquot_resume(s, -1);
1455                 reiserfs_write_lock(s);
1456                 finish_unfinished(s);
1457                 reiserfs_write_unlock(s);
1458                 reiserfs_xattr_init(s, *mount_flags);
1459         }
1460
1461 out_ok_unlocked:
1462         replace_mount_options(s, new_opts);
1463         return 0;
1464
1465 out_err_unlock:
1466         reiserfs_write_unlock(s);
1467 out_err:
1468         kfree(new_opts);
1469         return err;
1470 }
1471
1472 static int read_super_block(struct super_block *s, int offset)
1473 {
1474         struct buffer_head *bh;
1475         struct reiserfs_super_block *rs;
1476         int fs_blocksize;
1477
1478         bh = sb_bread(s, offset / s->s_blocksize);
1479         if (!bh) {
1480                 reiserfs_warning(s, "sh-2006",
1481                                  "bread failed (dev %s, block %lu, size %lu)",
1482                                  s->s_id, offset / s->s_blocksize,
1483                                  s->s_blocksize);
1484                 return 1;
1485         }
1486
1487         rs = (struct reiserfs_super_block *)bh->b_data;
1488         if (!is_any_reiserfs_magic_string(rs)) {
1489                 brelse(bh);
1490                 return 1;
1491         }
1492         //
1493         // ok, reiserfs signature (old or new) found in at the given offset
1494         //
1495         fs_blocksize = sb_blocksize(rs);
1496         brelse(bh);
1497         sb_set_blocksize(s, fs_blocksize);
1498
1499         bh = sb_bread(s, offset / s->s_blocksize);
1500         if (!bh) {
1501                 reiserfs_warning(s, "sh-2007",
1502                                  "bread failed (dev %s, block %lu, size %lu)",
1503                                  s->s_id, offset / s->s_blocksize,
1504                                  s->s_blocksize);
1505                 return 1;
1506         }
1507
1508         rs = (struct reiserfs_super_block *)bh->b_data;
1509         if (sb_blocksize(rs) != s->s_blocksize) {
1510                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1511                                  "filesystem on (dev %s, block %Lu, size %lu)",
1512                                  s->s_id,
1513                                  (unsigned long long)bh->b_blocknr,
1514                                  s->s_blocksize);
1515                 brelse(bh);
1516                 return 1;
1517         }
1518
1519         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1520                 brelse(bh);
1521                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1522                                  "--rebuild-tree run detected. Please run\n"
1523                                  "reiserfsck --rebuild-tree and wait for a "
1524                                  "completion. If that fails\n"
1525                                  "get newer reiserfsprogs package");
1526                 return 1;
1527         }
1528
1529         SB_BUFFER_WITH_SB(s) = bh;
1530         SB_DISK_SUPER_BLOCK(s) = rs;
1531
1532         if (is_reiserfs_jr(rs)) {
1533                 /* magic is of non-standard journal filesystem, look at s_version to
1534                    find which format is in use */
1535                 if (sb_version(rs) == REISERFS_VERSION_2)
1536                         reiserfs_info(s, "found reiserfs format \"3.6\""
1537                                       " with non-standard journal\n");
1538                 else if (sb_version(rs) == REISERFS_VERSION_1)
1539                         reiserfs_info(s, "found reiserfs format \"3.5\""
1540                                       " with non-standard journal\n");
1541                 else {
1542                         reiserfs_warning(s, "sh-2012", "found unknown "
1543                                          "format \"%u\" of reiserfs with "
1544                                          "non-standard magic", sb_version(rs));
1545                         return 1;
1546                 }
1547         } else
1548                 /* s_version of standard format may contain incorrect information,
1549                    so we just look at the magic string */
1550                 reiserfs_info(s,
1551                               "found reiserfs format \"%s\" with standard journal\n",
1552                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1553
1554         s->s_op = &reiserfs_sops;
1555         s->s_export_op = &reiserfs_export_ops;
1556 #ifdef CONFIG_QUOTA
1557         s->s_qcop = &reiserfs_qctl_operations;
1558         s->dq_op = &reiserfs_quota_operations;
1559 #endif
1560
1561         /* new format is limited by the 32 bit wide i_blocks field, want to
1562          ** be one full block below that.
1563          */
1564         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1565         return 0;
1566 }
1567
1568 /* after journal replay, reread all bitmap and super blocks */
1569 static int reread_meta_blocks(struct super_block *s)
1570 {
1571         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1572         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1573         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1574                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1575                 return 1;
1576         }
1577
1578         return 0;
1579 }
1580
1581 /////////////////////////////////////////////////////
1582 // hash detection stuff
1583
1584 // if root directory is empty - we set default - Yura's - hash and
1585 // warn about it
1586 // FIXME: we look for only one name in a directory. If tea and yura
1587 // bith have the same value - we ask user to send report to the
1588 // mailing list
1589 static __u32 find_hash_out(struct super_block *s)
1590 {
1591         int retval;
1592         struct inode *inode;
1593         struct cpu_key key;
1594         INITIALIZE_PATH(path);
1595         struct reiserfs_dir_entry de;
1596         __u32 hash = DEFAULT_HASH;
1597
1598         inode = s->s_root->d_inode;
1599
1600         do {                    // Some serious "goto"-hater was there ;)
1601                 u32 teahash, r5hash, yurahash;
1602
1603                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1604                 retval = search_by_entry_key(s, &key, &path, &de);
1605                 if (retval == IO_ERROR) {
1606                         pathrelse(&path);
1607                         return UNSET_HASH;
1608                 }
1609                 if (retval == NAME_NOT_FOUND)
1610                         de.de_entry_num--;
1611                 set_de_name_and_namelen(&de);
1612                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1613                         /* allow override in this case */
1614                         if (reiserfs_rupasov_hash(s)) {
1615                                 hash = YURA_HASH;
1616                         }
1617                         reiserfs_info(s, "FS seems to be empty, autodetect "
1618                                          "is using the default hash\n");
1619                         break;
1620                 }
1621                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1622                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1623                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1624                 if (((teahash == r5hash)
1625                      &&
1626                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1627                       == r5hash)) || ((teahash == yurahash)
1628                                       && (yurahash ==
1629                                           GET_HASH_VALUE(deh_offset
1630                                                          (&
1631                                                           (de.
1632                                                            de_deh[de.
1633                                                                   de_entry_num])))))
1634                     || ((r5hash == yurahash)
1635                         && (yurahash ==
1636                             GET_HASH_VALUE(deh_offset
1637                                            (&(de.de_deh[de.de_entry_num])))))) {
1638                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1639                                          "automatically detect hash function. "
1640                                          "Please mount with -o "
1641                                          "hash={tea,rupasov,r5}");
1642                         hash = UNSET_HASH;
1643                         break;
1644                 }
1645                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1646                     yurahash)
1647                         hash = YURA_HASH;
1648                 else if (GET_HASH_VALUE
1649                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1650                         hash = TEA_HASH;
1651                 else if (GET_HASH_VALUE
1652                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1653                         hash = R5_HASH;
1654                 else {
1655                         reiserfs_warning(s, "reiserfs-2506",
1656                                          "Unrecognised hash function");
1657                         hash = UNSET_HASH;
1658                 }
1659         } while (0);
1660
1661         pathrelse(&path);
1662         return hash;
1663 }
1664
1665 // finds out which hash names are sorted with
1666 static int what_hash(struct super_block *s)
1667 {
1668         __u32 code;
1669
1670         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1671
1672         /* reiserfs_hash_detect() == true if any of the hash mount options
1673          ** were used.  We must check them to make sure the user isn't
1674          ** using a bad hash value
1675          */
1676         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1677                 code = find_hash_out(s);
1678
1679         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1680                 /* detection has found the hash, and we must check against the
1681                  ** mount options
1682                  */
1683                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1684                         reiserfs_warning(s, "reiserfs-2507",
1685                                          "Error, %s hash detected, "
1686                                          "unable to force rupasov hash",
1687                                          reiserfs_hashname(code));
1688                         code = UNSET_HASH;
1689                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1690                         reiserfs_warning(s, "reiserfs-2508",
1691                                          "Error, %s hash detected, "
1692                                          "unable to force tea hash",
1693                                          reiserfs_hashname(code));
1694                         code = UNSET_HASH;
1695                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1696                         reiserfs_warning(s, "reiserfs-2509",
1697                                          "Error, %s hash detected, "
1698                                          "unable to force r5 hash",
1699                                          reiserfs_hashname(code));
1700                         code = UNSET_HASH;
1701                 }
1702         } else {
1703                 /* find_hash_out was not called or could not determine the hash */
1704                 if (reiserfs_rupasov_hash(s)) {
1705                         code = YURA_HASH;
1706                 } else if (reiserfs_tea_hash(s)) {
1707                         code = TEA_HASH;
1708                 } else if (reiserfs_r5_hash(s)) {
1709                         code = R5_HASH;
1710                 }
1711         }
1712
1713         /* if we are mounted RW, and we have a new valid hash code, update
1714          ** the super
1715          */
1716         if (code != UNSET_HASH &&
1717             !(s->s_flags & MS_RDONLY) &&
1718             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1719                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1720         }
1721         return code;
1722 }
1723
1724 // return pointer to appropriate function
1725 static hashf_t hash_function(struct super_block *s)
1726 {
1727         switch (what_hash(s)) {
1728         case TEA_HASH:
1729                 reiserfs_info(s, "Using tea hash to sort names\n");
1730                 return keyed_hash;
1731         case YURA_HASH:
1732                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1733                 return yura_hash;
1734         case R5_HASH:
1735                 reiserfs_info(s, "Using r5 hash to sort names\n");
1736                 return r5_hash;
1737         }
1738         return NULL;
1739 }
1740
1741 // this is used to set up correct value for old partitions
1742 static int function2code(hashf_t func)
1743 {
1744         if (func == keyed_hash)
1745                 return TEA_HASH;
1746         if (func == yura_hash)
1747                 return YURA_HASH;
1748         if (func == r5_hash)
1749                 return R5_HASH;
1750
1751         BUG();                  // should never happen
1752
1753         return 0;
1754 }
1755
1756 #define SWARN(silent, s, id, ...)                       \
1757         if (!(silent))                          \
1758                 reiserfs_warning(s, id, __VA_ARGS__)
1759
1760 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1761 {
1762         struct inode *root_inode;
1763         struct reiserfs_transaction_handle th;
1764         int old_format = 0;
1765         unsigned long blocks;
1766         unsigned int commit_max_age = 0;
1767         int jinit_done = 0;
1768         struct reiserfs_iget_args args;
1769         struct reiserfs_super_block *rs;
1770         char *jdev_name;
1771         struct reiserfs_sb_info *sbi;
1772         int errval = -EINVAL;
1773         char *qf_names[MAXQUOTAS] = {};
1774         unsigned int qfmt = 0;
1775
1776         save_mount_options(s, data);
1777
1778         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1779         if (!sbi)
1780                 return -ENOMEM;
1781         s->s_fs_info = sbi;
1782         /* Set default values for options: non-aggressive tails, RO on errors */
1783         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1784         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1785         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1786         /* no preallocation minimum, be smart in
1787            reiserfs_file_write instead */
1788         sbi->s_alloc_options.preallocmin = 0;
1789         /* Preallocate by 16 blocks (17-1) at once */
1790         sbi->s_alloc_options.preallocsize = 17;
1791         /* setup default block allocator options */
1792         reiserfs_init_alloc_options(s);
1793
1794         spin_lock_init(&sbi->old_work_lock);
1795         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1796         mutex_init(&sbi->lock);
1797         sbi->lock_depth = -1;
1798
1799         jdev_name = NULL;
1800         if (reiserfs_parse_options
1801             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1802              &commit_max_age, qf_names, &qfmt) == 0) {
1803                 goto error_unlocked;
1804         }
1805         if (jdev_name && jdev_name[0]) {
1806                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1807                 if (!sbi->s_jdev) {
1808                         SWARN(silent, s, "", "Cannot allocate memory for "
1809                                 "journal device name");
1810                         goto error;
1811                 }
1812         }
1813 #ifdef CONFIG_QUOTA
1814         handle_quota_files(s, qf_names, &qfmt);
1815 #endif
1816
1817         if (blocks) {
1818                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1819                 goto error_unlocked;
1820         }
1821
1822         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1823         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1824                 old_format = 1;
1825         /* try new format (64-th 1k block), which can contain reiserfs super block */
1826         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1827                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1828                       s->s_id);
1829                 goto error_unlocked;
1830         }
1831
1832         rs = SB_DISK_SUPER_BLOCK(s);
1833         /* Let's do basic sanity check to verify that underlying device is not
1834            smaller than the filesystem. If the check fails then abort and scream,
1835            because bad stuff will happen otherwise. */
1836         if (s->s_bdev && s->s_bdev->bd_inode
1837             && i_size_read(s->s_bdev->bd_inode) <
1838             sb_block_count(rs) * sb_blocksize(rs)) {
1839                 SWARN(silent, s, "", "Filesystem cannot be "
1840                       "mounted because it is bigger than the device");
1841                 SWARN(silent, s, "", "You may need to run fsck "
1842                       "or increase size of your LVM partition");
1843                 SWARN(silent, s, "", "Or may be you forgot to "
1844                       "reboot after fdisk when it told you to");
1845                 goto error_unlocked;
1846         }
1847
1848         sbi->s_mount_state = SB_REISERFS_STATE(s);
1849         sbi->s_mount_state = REISERFS_VALID_FS;
1850
1851         if ((errval = reiserfs_init_bitmap_cache(s))) {
1852                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1853                 goto error_unlocked;
1854         }
1855
1856         errval = -EINVAL;
1857 #ifdef CONFIG_REISERFS_CHECK
1858         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1859         SWARN(silent, s, "", "- it is slow mode for debugging.");
1860 #endif
1861
1862         /* make data=ordered the default */
1863         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1864             !reiserfs_data_writeback(s)) {
1865                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1866         }
1867
1868         if (reiserfs_data_log(s)) {
1869                 reiserfs_info(s, "using journaled data mode\n");
1870         } else if (reiserfs_data_ordered(s)) {
1871                 reiserfs_info(s, "using ordered data mode\n");
1872         } else {
1873                 reiserfs_info(s, "using writeback data mode\n");
1874         }
1875         if (reiserfs_barrier_flush(s)) {
1876                 printk("reiserfs: using flush barriers\n");
1877         }
1878
1879         // set_device_ro(s->s_dev, 1) ;
1880         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1881                 SWARN(silent, s, "sh-2022",
1882                       "unable to initialize journal space");
1883                 goto error_unlocked;
1884         } else {
1885                 jinit_done = 1; /* once this is set, journal_release must be called
1886                                  ** if we error out of the mount
1887                                  */
1888         }
1889
1890         if (reread_meta_blocks(s)) {
1891                 SWARN(silent, s, "jmacd-9",
1892                       "unable to reread meta blocks after journal init");
1893                 goto error_unlocked;
1894         }
1895
1896         if (replay_only(s))
1897                 goto error_unlocked;
1898
1899         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1900                 SWARN(silent, s, "clm-7000",
1901                       "Detected readonly device, marking FS readonly");
1902                 s->s_flags |= MS_RDONLY;
1903         }
1904         args.objectid = REISERFS_ROOT_OBJECTID;
1905         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1906         root_inode =
1907             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1908                          reiserfs_init_locked_inode, (void *)(&args));
1909         if (!root_inode) {
1910                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1911                 goto error_unlocked;
1912         }
1913
1914         /*
1915          * This path assumed to be called with the BKL in the old times.
1916          * Now we have inherited the big reiserfs lock from it and many
1917          * reiserfs helpers called in the mount path and elsewhere require
1918          * this lock to be held even if it's not always necessary. Let's be
1919          * conservative and hold it early. The window can be reduced after
1920          * careful review of the code.
1921          */
1922         reiserfs_write_lock(s);
1923
1924         if (root_inode->i_state & I_NEW) {
1925                 reiserfs_read_locked_inode(root_inode, &args);
1926                 unlock_new_inode(root_inode);
1927         }
1928
1929         s->s_root = d_make_root(root_inode);
1930         if (!s->s_root)
1931                 goto error;
1932         // define and initialize hash function
1933         sbi->s_hash_function = hash_function(s);
1934         if (sbi->s_hash_function == NULL) {
1935                 dput(s->s_root);
1936                 s->s_root = NULL;
1937                 goto error;
1938         }
1939
1940         if (is_reiserfs_3_5(rs)
1941             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1942                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1943         else if (old_format)
1944                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1945         else
1946                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1947
1948         if (!(s->s_flags & MS_RDONLY)) {
1949
1950                 errval = journal_begin(&th, s, 1);
1951                 if (errval) {
1952                         dput(s->s_root);
1953                         s->s_root = NULL;
1954                         goto error;
1955                 }
1956                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1957
1958                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1959                 set_sb_fs_state(rs, 0);
1960
1961                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1962                  * case, but older revisions can't. This will cause the
1963                  * file system to fail mount on those older implementations,
1964                  * avoiding corruption. -jeffm */
1965                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1966                     sb_bmap_nr(rs) != 0) {
1967                         reiserfs_warning(s, "super-2030", "This file system "
1968                                         "claims to use %u bitmap blocks in "
1969                                         "its super block, but requires %u. "
1970                                         "Clearing to zero.", sb_bmap_nr(rs),
1971                                         reiserfs_bmap_count(s));
1972
1973                         set_sb_bmap_nr(rs, 0);
1974                 }
1975
1976                 if (old_format_only(s)) {
1977                         /* filesystem of format 3.5 either with standard or non-standard
1978                            journal */
1979                         if (convert_reiserfs(s)) {
1980                                 /* and -o conv is given */
1981                                 if (!silent)
1982                                         reiserfs_info(s,
1983                                                       "converting 3.5 filesystem to the 3.6 format");
1984
1985                                 if (is_reiserfs_3_5(rs))
1986                                         /* put magic string of 3.6 format. 2.2 will not be able to
1987                                            mount this filesystem anymore */
1988                                         memcpy(rs->s_v1.s_magic,
1989                                                reiserfs_3_6_magic_string,
1990                                                sizeof
1991                                                (reiserfs_3_6_magic_string));
1992
1993                                 set_sb_version(rs, REISERFS_VERSION_2);
1994                                 reiserfs_convert_objectid_map_v1(s);
1995                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1996                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1997                         } else if (!silent) {
1998                                 reiserfs_info(s, "using 3.5.x disk format\n");
1999                         }
2000                 } else
2001                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2002
2003
2004                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2005                 errval = journal_end(&th, s, 1);
2006                 if (errval) {
2007                         dput(s->s_root);
2008                         s->s_root = NULL;
2009                         goto error;
2010                 }
2011
2012                 reiserfs_write_unlock(s);
2013                 if ((errval = reiserfs_lookup_privroot(s)) ||
2014                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2015                         dput(s->s_root);
2016                         s->s_root = NULL;
2017                         goto error_unlocked;
2018                 }
2019                 reiserfs_write_lock(s);
2020
2021                 /* look for files which were to be removed in previous session */
2022                 finish_unfinished(s);
2023         } else {
2024                 if (old_format_only(s) && !silent) {
2025                         reiserfs_info(s, "using 3.5.x disk format\n");
2026                 }
2027
2028                 reiserfs_write_unlock(s);
2029                 if ((errval = reiserfs_lookup_privroot(s)) ||
2030                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2031                         dput(s->s_root);
2032                         s->s_root = NULL;
2033                         goto error_unlocked;
2034                 }
2035                 reiserfs_write_lock(s);
2036         }
2037         // mark hash in super block: it could be unset. overwrite should be ok
2038         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2039
2040         handle_attrs(s);
2041
2042         reiserfs_proc_info_init(s);
2043
2044         init_waitqueue_head(&(sbi->s_wait));
2045         spin_lock_init(&sbi->bitmap_lock);
2046
2047         reiserfs_write_unlock(s);
2048
2049         return (0);
2050
2051 error:
2052         reiserfs_write_unlock(s);
2053
2054 error_unlocked:
2055         /* kill the commit thread, free journal ram */
2056         if (jinit_done) {
2057                 reiserfs_write_lock(s);
2058                 journal_release_error(NULL, s);
2059                 reiserfs_write_unlock(s);
2060         }
2061
2062         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2063
2064         reiserfs_free_bitmap_cache(s);
2065         if (SB_BUFFER_WITH_SB(s))
2066                 brelse(SB_BUFFER_WITH_SB(s));
2067 #ifdef CONFIG_QUOTA
2068         {
2069                 int j;
2070                 for (j = 0; j < MAXQUOTAS; j++)
2071                         kfree(qf_names[j]);
2072         }
2073 #endif
2074         kfree(sbi);
2075
2076         s->s_fs_info = NULL;
2077         return errval;
2078 }
2079
2080 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2081 {
2082         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2083
2084         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2085         buf->f_bfree = sb_free_blocks(rs);
2086         buf->f_bavail = buf->f_bfree;
2087         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2088         buf->f_bsize = dentry->d_sb->s_blocksize;
2089         /* changed to accommodate gcc folks. */
2090         buf->f_type = REISERFS_SUPER_MAGIC;
2091         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2092         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2093                                 sizeof(rs->s_uuid)/2);
2094
2095         return 0;
2096 }
2097
2098 #ifdef CONFIG_QUOTA
2099 static int reiserfs_write_dquot(struct dquot *dquot)
2100 {
2101         struct reiserfs_transaction_handle th;
2102         int ret, err;
2103         int depth;
2104
2105         reiserfs_write_lock(dquot->dq_sb);
2106         ret =
2107             journal_begin(&th, dquot->dq_sb,
2108                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2109         if (ret)
2110                 goto out;
2111         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2112         ret = dquot_commit(dquot);
2113         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2114         err =
2115             journal_end(&th, dquot->dq_sb,
2116                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2117         if (!ret && err)
2118                 ret = err;
2119 out:
2120         reiserfs_write_unlock(dquot->dq_sb);
2121         return ret;
2122 }
2123
2124 static int reiserfs_acquire_dquot(struct dquot *dquot)
2125 {
2126         struct reiserfs_transaction_handle th;
2127         int ret, err;
2128         int depth;
2129
2130         reiserfs_write_lock(dquot->dq_sb);
2131         ret =
2132             journal_begin(&th, dquot->dq_sb,
2133                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2134         if (ret)
2135                 goto out;
2136         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2137         ret = dquot_acquire(dquot);
2138         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2139         err =
2140             journal_end(&th, dquot->dq_sb,
2141                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2142         if (!ret && err)
2143                 ret = err;
2144 out:
2145         reiserfs_write_unlock(dquot->dq_sb);
2146         return ret;
2147 }
2148
2149 static int reiserfs_release_dquot(struct dquot *dquot)
2150 {
2151         struct reiserfs_transaction_handle th;
2152         int ret, err;
2153
2154         reiserfs_write_lock(dquot->dq_sb);
2155         ret =
2156             journal_begin(&th, dquot->dq_sb,
2157                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2158         reiserfs_write_unlock(dquot->dq_sb);
2159         if (ret) {
2160                 /* Release dquot anyway to avoid endless cycle in dqput() */
2161                 dquot_release(dquot);
2162                 goto out;
2163         }
2164         ret = dquot_release(dquot);
2165         reiserfs_write_lock(dquot->dq_sb);
2166         err =
2167             journal_end(&th, dquot->dq_sb,
2168                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2169         if (!ret && err)
2170                 ret = err;
2171         reiserfs_write_unlock(dquot->dq_sb);
2172 out:
2173         return ret;
2174 }
2175
2176 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2177 {
2178         /* Are we journaling quotas? */
2179         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2180             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2181                 dquot_mark_dquot_dirty(dquot);
2182                 return reiserfs_write_dquot(dquot);
2183         } else
2184                 return dquot_mark_dquot_dirty(dquot);
2185 }
2186
2187 static int reiserfs_write_info(struct super_block *sb, int type)
2188 {
2189         struct reiserfs_transaction_handle th;
2190         int ret, err;
2191         int depth;
2192
2193         /* Data block + inode block */
2194         reiserfs_write_lock(sb);
2195         ret = journal_begin(&th, sb, 2);
2196         if (ret)
2197                 goto out;
2198         depth = reiserfs_write_unlock_nested(sb);
2199         ret = dquot_commit_info(sb, type);
2200         reiserfs_write_lock_nested(sb, depth);
2201         err = journal_end(&th, sb, 2);
2202         if (!ret && err)
2203                 ret = err;
2204 out:
2205         reiserfs_write_unlock(sb);
2206         return ret;
2207 }
2208
2209 /*
2210  * Turn on quotas during mount time - we need to find the quota file and such...
2211  */
2212 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2213 {
2214         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2215                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2216 }
2217
2218 /*
2219  * Standard function to be called on quota_on
2220  */
2221 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2222                              struct path *path)
2223 {
2224         int err;
2225         struct inode *inode;
2226         struct reiserfs_transaction_handle th;
2227         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2228
2229         reiserfs_write_lock(sb);
2230         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2231                 err = -EINVAL;
2232                 goto out;
2233         }
2234
2235         /* Quotafile not on the same filesystem? */
2236         if (path->dentry->d_sb != sb) {
2237                 err = -EXDEV;
2238                 goto out;
2239         }
2240         inode = path->dentry->d_inode;
2241         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2242         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2243                 err = reiserfs_unpack(inode, NULL);
2244                 if (err) {
2245                         reiserfs_warning(sb, "super-6520",
2246                                 "Unpacking tail of quota file failed"
2247                                 " (%d). Cannot turn on quotas.", err);
2248                         err = -EINVAL;
2249                         goto out;
2250                 }
2251                 mark_inode_dirty(inode);
2252         }
2253         /* Journaling quota? */
2254         if (REISERFS_SB(sb)->s_qf_names[type]) {
2255                 /* Quotafile not of fs root? */
2256                 if (path->dentry->d_parent != sb->s_root)
2257                         reiserfs_warning(sb, "super-6521",
2258                                  "Quota file not on filesystem root. "
2259                                  "Journalled quota will not work.");
2260         }
2261
2262         /*
2263          * When we journal data on quota file, we have to flush journal to see
2264          * all updates to the file when we bypass pagecache...
2265          */
2266         if (reiserfs_file_data_log(inode)) {
2267                 /* Just start temporary transaction and finish it */
2268                 err = journal_begin(&th, sb, 1);
2269                 if (err)
2270                         goto out;
2271                 err = journal_end_sync(&th, sb, 1);
2272                 if (err)
2273                         goto out;
2274         }
2275         reiserfs_write_unlock(sb);
2276         return dquot_quota_on(sb, type, format_id, path);
2277 out:
2278         reiserfs_write_unlock(sb);
2279         return err;
2280 }
2281
2282 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2283  * acquiring the locks... As quota files are never truncated and quota code
2284  * itself serializes the operations (and no one else should touch the files)
2285  * we don't have to be afraid of races */
2286 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2287                                    size_t len, loff_t off)
2288 {
2289         struct inode *inode = sb_dqopt(sb)->files[type];
2290         unsigned long blk = off >> sb->s_blocksize_bits;
2291         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2292         size_t toread;
2293         struct buffer_head tmp_bh, *bh;
2294         loff_t i_size = i_size_read(inode);
2295
2296         if (off > i_size)
2297                 return 0;
2298         if (off + len > i_size)
2299                 len = i_size - off;
2300         toread = len;
2301         while (toread > 0) {
2302                 tocopy =
2303                     sb->s_blocksize - offset <
2304                     toread ? sb->s_blocksize - offset : toread;
2305                 tmp_bh.b_state = 0;
2306                 /* Quota files are without tails so we can safely use this function */
2307                 reiserfs_write_lock(sb);
2308                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2309                 reiserfs_write_unlock(sb);
2310                 if (err)
2311                         return err;
2312                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2313                         memset(data, 0, tocopy);
2314                 else {
2315                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2316                         if (!bh)
2317                                 return -EIO;
2318                         memcpy(data, bh->b_data + offset, tocopy);
2319                         brelse(bh);
2320                 }
2321                 offset = 0;
2322                 toread -= tocopy;
2323                 data += tocopy;
2324                 blk++;
2325         }
2326         return len;
2327 }
2328
2329 /* Write to quotafile (we know the transaction is already started and has
2330  * enough credits) */
2331 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2332                                     const char *data, size_t len, loff_t off)
2333 {
2334         struct inode *inode = sb_dqopt(sb)->files[type];
2335         unsigned long blk = off >> sb->s_blocksize_bits;
2336         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2337         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2338         size_t towrite = len;
2339         struct buffer_head tmp_bh, *bh;
2340
2341         if (!current->journal_info) {
2342                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2343                         " cancelled because transaction is not started.\n",
2344                         (unsigned long long)off, (unsigned long long)len);
2345                 return -EIO;
2346         }
2347         while (towrite > 0) {
2348                 tocopy = sb->s_blocksize - offset < towrite ?
2349                     sb->s_blocksize - offset : towrite;
2350                 tmp_bh.b_state = 0;
2351                 reiserfs_write_lock(sb);
2352                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2353                 reiserfs_write_unlock(sb);
2354                 if (err)
2355                         goto out;
2356                 if (offset || tocopy != sb->s_blocksize)
2357                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2358                 else
2359                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2360                 if (!bh) {
2361                         err = -EIO;
2362                         goto out;
2363                 }
2364                 lock_buffer(bh);
2365                 memcpy(bh->b_data + offset, data, tocopy);
2366                 flush_dcache_page(bh->b_page);
2367                 set_buffer_uptodate(bh);
2368                 unlock_buffer(bh);
2369                 reiserfs_write_lock(sb);
2370                 reiserfs_prepare_for_journal(sb, bh, 1);
2371                 journal_mark_dirty(current->journal_info, sb, bh);
2372                 if (!journal_quota)
2373                         reiserfs_add_ordered_list(inode, bh);
2374                 reiserfs_write_unlock(sb);
2375                 brelse(bh);
2376                 offset = 0;
2377                 towrite -= tocopy;
2378                 data += tocopy;
2379                 blk++;
2380         }
2381 out:
2382         if (len == towrite)
2383                 return err;
2384         if (inode->i_size < off + len - towrite)
2385                 i_size_write(inode, off + len - towrite);
2386         inode->i_version++;
2387         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2388         mark_inode_dirty(inode);
2389         return len - towrite;
2390 }
2391
2392 #endif
2393
2394 static struct dentry *get_super_block(struct file_system_type *fs_type,
2395                            int flags, const char *dev_name,
2396                            void *data)
2397 {
2398         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2399 }
2400
2401 static int __init init_reiserfs_fs(void)
2402 {
2403         int ret;
2404
2405         if ((ret = init_inodecache())) {
2406                 return ret;
2407         }
2408
2409         reiserfs_proc_info_global_init();
2410
2411         ret = register_filesystem(&reiserfs_fs_type);
2412
2413         if (ret == 0) {
2414                 return 0;
2415         }
2416
2417         reiserfs_proc_info_global_done();
2418         destroy_inodecache();
2419
2420         return ret;
2421 }
2422
2423 static void __exit exit_reiserfs_fs(void)
2424 {
2425         reiserfs_proc_info_global_done();
2426         unregister_filesystem(&reiserfs_fs_type);
2427         destroy_inodecache();
2428 }
2429
2430 struct file_system_type reiserfs_fs_type = {
2431         .owner = THIS_MODULE,
2432         .name = "reiserfs",
2433         .mount = get_super_block,
2434         .kill_sb = reiserfs_kill_sb,
2435         .fs_flags = FS_REQUIRES_DEV,
2436 };
2437 MODULE_ALIAS_FS("reiserfs");
2438
2439 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2440 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2441 MODULE_LICENSE("GPL");
2442
2443 module_init(init_reiserfs_fs);
2444 module_exit(exit_reiserfs_fs);