Pileus Git - ~andy/linux/blob - 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 void show_alloc_options(struct seq_file *seq, struct super_block *s);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th, s, 1))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         sbi->work_queued = 0;
  94         spin_unlock(&sbi->old_work_lock);
  95
  96         reiserfs_sync_fs(s, 1);
  97 }
  98
  99 void reiserfs_schedule_old_flush(struct super_block *s)
 100 {
 101         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 102         unsigned long delay;
 103
 104         if (s->s_flags & MS_RDONLY)
 105                 return;
 106
 107         spin_lock(&sbi->old_work_lock);
 108         if (!sbi->work_queued) {
 109                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 110                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 111                 sbi->work_queued = 1;
 112         }
 113         spin_unlock(&sbi->old_work_lock);
 114 }
 115
 116 static void cancel_old_flush(struct super_block *s)
 117 {
 118         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 119
 120         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 121         spin_lock(&sbi->old_work_lock);
 122         sbi->work_queued = 0;
 123         spin_unlock(&sbi->old_work_lock);
 124 }
 125
 126 static int reiserfs_freeze(struct super_block *s)
 127 {
 128         struct reiserfs_transaction_handle th;
 129
 130         cancel_old_flush(s);
 131
 132         reiserfs_write_lock(s);
 133         if (!(s->s_flags & MS_RDONLY)) {
 134                 int err = journal_begin(&th, s, 1);
 135                 if (err) {
 136                         reiserfs_block_writes(&th);
 137                 } else {
 138                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 139                                                      1);
 140                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 141                         reiserfs_block_writes(&th);
 142                         journal_end_sync(&th, s, 1);
 143                 }
 144         }
 145         reiserfs_write_unlock(s);
 146         return 0;
 147 }
 148
 149 static int reiserfs_unfreeze(struct super_block *s)
 150 {
 151         reiserfs_allow_writes(s);
 152         return 0;
 153 }
 154
 155 extern const struct in_core_key MAX_IN_CORE_KEY;
 156
 157 /* this is used to delete "save link" when there are no items of a
 158    file it points to. It can either happen if unlink is completed but
 159    "save unlink" removal, or if file has both unlink and truncate
 160    pending and as unlink completes first (because key of "save link"
 161    protecting unlink is bigger that a key lf "save link" which
 162    protects truncate), so there left no items to make truncate
 163    completion on */
 164 static int remove_save_link_only(struct super_block *s,
 165                                  struct reiserfs_key *key, int oid_free)
 166 {
 167         struct reiserfs_transaction_handle th;
 168         int err;
 169
 170         /* we are going to do one balancing */
 171         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 172         if (err)
 173                 return err;
 174
 175         reiserfs_delete_solid_item(&th, NULL, key);
 176         if (oid_free)
 177                 /* removals are protected by direct items */
 178                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 179
 180         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 181 }
 182
 183 #ifdef CONFIG_QUOTA
 184 static int reiserfs_quota_on_mount(struct super_block *, int);
 185 #endif
 186
 187 /* look for uncompleted unlinks and truncates and complete them */
 188 static int finish_unfinished(struct super_block *s)
 189 {
 190         INITIALIZE_PATH(path);
 191         struct cpu_key max_cpu_key, obj_key;
 192         struct reiserfs_key save_link_key, last_inode_key;
 193         int retval = 0;
 194         struct item_head *ih;
 195         struct buffer_head *bh;
 196         int item_pos;
 197         char *item;
 198         int done;
 199         struct inode *inode;
 200         int truncate;
 201 #ifdef CONFIG_QUOTA
 202         int i;
 203         int ms_active_set;
 204         int quota_enabled[MAXQUOTAS];
 205 #endif
 206
 207         /* compose key to look for "save" links */
 208         max_cpu_key.version = KEY_FORMAT_3_5;
 209         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 210         max_cpu_key.on_disk_key.k_objectid = ~0U;
 211         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 212         max_cpu_key.key_length = 3;
 213
 214         memset(&last_inode_key, 0, sizeof(last_inode_key));
 215
 216 #ifdef CONFIG_QUOTA
 217         /* Needed for iput() to work correctly and not trash data */
 218         if (s->s_flags & MS_ACTIVE) {
 219                 ms_active_set = 0;
 220         } else {
 221                 ms_active_set = 1;
 222                 s->s_flags |= MS_ACTIVE;
 223         }
 224         /* Turn on quotas so that they are updated correctly */
 225         for (i = 0; i < MAXQUOTAS; i++) {
 226                 quota_enabled[i] = 1;
 227                 if (REISERFS_SB(s)->s_qf_names[i]) {
 228                         int ret;
 229
 230                         if (sb_has_quota_active(s, i)) {
 231                                 quota_enabled[i] = 0;
 232                                 continue;
 233                         }
 234                         ret = reiserfs_quota_on_mount(s, i);
 235                         if (ret < 0)
 236                                 reiserfs_warning(s, "reiserfs-2500",
 237                                                  "cannot turn on journaled "
 238                                                  "quota: error %d", ret);
 239                 }
 240         }
 241 #endif
 242
 243         done = 0;
 244         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 245         while (!retval) {
 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                 dquot_initialize(inode);
 302
 303                 if (truncate && S_ISDIR(inode->i_mode)) {
 304                         /* We got a truncate request for a dir which is impossible.
 305                            The only imaginable way is to execute unfinished truncate request
 306                            then boot into old kernel, remove the file and create dir with
 307                            the same key. */
 308                         reiserfs_warning(s, "green-2101",
 309                                          "impossible truncate on a "
 310                                          "directory %k. Please report",
 311                                          INODE_PKEY(inode));
 312                         retval = remove_save_link_only(s, &save_link_key, 0);
 313                         truncate = 0;
 314                         iput(inode);
 315                         continue;
 316                 }
 317
 318                 if (truncate) {
 319                         REISERFS_I(inode)->i_flags |=
 320                             i_link_saved_truncate_mask;
 321                         /* not completed truncate found. New size was committed together
 322                            with "save" link */
 323                         reiserfs_info(s, "Truncating %k to %Ld ..",
 324                                       INODE_PKEY(inode), inode->i_size);
 325                         reiserfs_truncate_file(inode,
 326                                                0
 327                                                /*don't update modification time */
 328                                                );
 329                         retval = remove_save_link(inode, truncate);
 330                 } else {
 331                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 332                         /* not completed unlink (rmdir) found */
 333                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 334                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 335                                         sizeof(last_inode_key))){
 336                                 last_inode_key = *INODE_PKEY(inode);
 337                                 /* removal gets completed in iput */
 338                                 retval = 0;
 339                         } else {
 340                                 reiserfs_warning(s, "super-2189", "Dead loop "
 341                                                  "in finish_unfinished "
 342                                                  "detected, just remove "
 343                                                  "save link\n");
 344                                 retval = remove_save_link_only(s,
 345                                                         &save_link_key, 0);
 346                         }
 347                 }
 348
 349                 iput(inode);
 350                 printk("done\n");
 351                 done++;
 352         }
 353         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 354
 355 #ifdef CONFIG_QUOTA
 356         /* Turn quotas off */
 357         for (i = 0; i < MAXQUOTAS; i++) {
 358                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 359                         dquot_quota_off(s, i);
 360         }
 361         if (ms_active_set)
 362                 /* Restore the flag back */
 363                 s->s_flags &= ~MS_ACTIVE;
 364 #endif
 365         pathrelse(&path);
 366         if (done)
 367                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 368                               "Completed\n", done);
 369         return retval;
 370 }
 371
 372 /* to protect file being unlinked from getting lost we "safe" link files
 373    being unlinked. This link will be deleted in the same transaction with last
 374    item of file. mounting the filesystem we scan all these links and remove
 375    files which almost got lost */
 376 void add_save_link(struct reiserfs_transaction_handle *th,
 377                    struct inode *inode, int truncate)
 378 {
 379         INITIALIZE_PATH(path);
 380         int retval;
 381         struct cpu_key key;
 382         struct item_head ih;
 383         __le32 link;
 384
 385         BUG_ON(!th->t_trans_id);
 386
 387         /* file can only get one "save link" of each kind */
 388         RFALSE(truncate &&
 389                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 390                "saved link already exists for truncated inode %lx",
 391                (long)inode->i_ino);
 392         RFALSE(!truncate &&
 393                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 394                "saved link already exists for unlinked inode %lx",
 395                (long)inode->i_ino);
 396
 397         /* setup key of "save" link */
 398         key.version = KEY_FORMAT_3_5;
 399         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 400         key.on_disk_key.k_objectid = inode->i_ino;
 401         if (!truncate) {
 402                 /* unlink, rmdir, rename */
 403                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 404                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 405
 406                 /* item head of "safe" link */
 407                 make_le_item_head(&ih, &key, key.version,
 408                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 409                                   4 /*length */ , 0xffff /*free space */ );
 410         } else {
 411                 /* truncate */
 412                 if (S_ISDIR(inode->i_mode))
 413                         reiserfs_warning(inode->i_sb, "green-2102",
 414                                          "Adding a truncate savelink for "
 415                                          "a directory %k! Please report",
 416                                          INODE_PKEY(inode));
 417                 set_cpu_key_k_offset(&key, 1);
 418                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 419
 420                 /* item head of "safe" link */
 421                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 422                                   4 /*length */ , 0 /*free space */ );
 423         }
 424         key.key_length = 3;
 425
 426         /* look for its place in the tree */
 427         retval = search_item(inode->i_sb, &key, &path);
 428         if (retval != ITEM_NOT_FOUND) {
 429                 if (retval != -ENOSPC)
 430                         reiserfs_error(inode->i_sb, "vs-2100",
 431                                        "search_by_key (%K) returned %d", &key,
 432                                        retval);
 433                 pathrelse(&path);
 434                 return;
 435         }
 436
 437         /* body of "save" link */
 438         link = INODE_PKEY(inode)->k_dir_id;
 439
 440         /* put "save" link into tree, don't charge quota to anyone */
 441         retval =
 442             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 443         if (retval) {
 444                 if (retval != -ENOSPC)
 445                         reiserfs_error(inode->i_sb, "vs-2120",
 446                                        "insert_item returned %d", retval);
 447         } else {
 448                 if (truncate)
 449                         REISERFS_I(inode)->i_flags |=
 450                             i_link_saved_truncate_mask;
 451                 else
 452                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 453         }
 454 }
 455
 456 /* this opens transaction unlike add_save_link */
 457 int remove_save_link(struct inode *inode, int truncate)
 458 {
 459         struct reiserfs_transaction_handle th;
 460         struct reiserfs_key key;
 461         int err;
 462
 463         /* we are going to do one balancing only */
 464         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 465         if (err)
 466                 return err;
 467
 468         /* setup key of "save" link */
 469         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 470         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 471         if (!truncate) {
 472                 /* unlink, rmdir, rename */
 473                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 474                                     1 + inode->i_sb->s_blocksize);
 475                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 476         } else {
 477                 /* truncate */
 478                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 479                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 480         }
 481
 482         if ((truncate &&
 483              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 484             (!truncate &&
 485              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 486                 /* don't take quota bytes from anywhere */
 487                 reiserfs_delete_solid_item(&th, NULL, &key);
 488         if (!truncate) {
 489                 reiserfs_release_objectid(&th, inode->i_ino);
 490                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 491         } else
 492                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 493
 494         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 495 }
 496
 497 static void reiserfs_kill_sb(struct super_block *s)
 498 {
 499         if (REISERFS_SB(s)) {
 500                 /*
 501                  * Force any pending inode evictions to occur now. Any
 502                  * inodes to be removed that have extended attributes
 503                  * associated with them need to clean them up before
 504                  * we can release the extended attribute root dentries.
 505                  * shrink_dcache_for_umount will BUG if we don't release
 506                  * those before it's called so ->put_super is too late.
 507                  */
 508                 shrink_dcache_sb(s);
 509
 510                 dput(REISERFS_SB(s)->xattr_root);
 511                 REISERFS_SB(s)->xattr_root = NULL;
 512                 dput(REISERFS_SB(s)->priv_root);
 513                 REISERFS_SB(s)->priv_root = NULL;
 514         }
 515
 516         kill_block_super(s);
 517 }
 518
 519 static void reiserfs_put_super(struct super_block *s)
 520 {
 521         struct reiserfs_transaction_handle th;
 522         th.t_trans_id = 0;
 523
 524         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 525
 526         reiserfs_write_lock(s);
 527
 528         /* change file system state to current state if it was mounted with read-write permissions */
 529         if (!(s->s_flags & MS_RDONLY)) {
 530                 if (!journal_begin(&th, s, 10)) {
 531                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 532                                                      1);
 533                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 534                                             REISERFS_SB(s)->s_mount_state);
 535                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 536                 }
 537         }
 538
 539         /* note, journal_release checks for readonly mount, and can decide not
 540          ** to do a journal_end
 541          */
 542         journal_release(&th, s);
 543
 544         reiserfs_free_bitmap_cache(s);
 545
 546         brelse(SB_BUFFER_WITH_SB(s));
 547
 548         print_statistics(s);
 549
 550         if (REISERFS_SB(s)->reserved_blocks != 0) {
 551                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 552                                  REISERFS_SB(s)->reserved_blocks);
 553         }
 554
 555         reiserfs_proc_info_done(s);
 556
 557         reiserfs_write_unlock(s);
 558         mutex_destroy(&REISERFS_SB(s)->lock);
 559         kfree(s->s_fs_info);
 560         s->s_fs_info = NULL;
 561 }
 562
 563 static struct kmem_cache *reiserfs_inode_cachep;
 564
 565 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 566 {
 567         struct reiserfs_inode_info *ei;
 568         ei = (struct reiserfs_inode_info *)
 569             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 570         if (!ei)
 571                 return NULL;
 572         atomic_set(&ei->openers, 0);
 573         mutex_init(&ei->tailpack);
 574         return &ei->vfs_inode;
 575 }
 576
 577 static void reiserfs_i_callback(struct rcu_head *head)
 578 {
 579         struct inode *inode = container_of(head, struct inode, i_rcu);
 580         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 581 }
 582
 583 static void reiserfs_destroy_inode(struct inode *inode)
 584 {
 585         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 586 }
 587
 588 static void init_once(void *foo)
 589 {
 590         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 591
 592         INIT_LIST_HEAD(&ei->i_prealloc_list);
 593         inode_init_once(&ei->vfs_inode);
 594 }
 595
 596 static int init_inodecache(void)
 597 {
 598         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 599                                                   sizeof(struct
 600                                                          reiserfs_inode_info),
 601                                                   0, (SLAB_RECLAIM_ACCOUNT|
 602                                                         SLAB_MEM_SPREAD),
 603                                                   init_once);
 604         if (reiserfs_inode_cachep == NULL)
 605                 return -ENOMEM;
 606         return 0;
 607 }
 608
 609 static void destroy_inodecache(void)
 610 {
 611         /*
 612          * Make sure all delayed rcu free inodes are flushed before we
 613          * destroy cache.
 614          */
 615         rcu_barrier();
 616         kmem_cache_destroy(reiserfs_inode_cachep);
 617 }
 618
 619 /* we don't mark inodes dirty, we just log them */
 620 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 621 {
 622         struct reiserfs_transaction_handle th;
 623
 624         int err = 0;
 625         int lock_depth;
 626
 627         if (inode->i_sb->s_flags & MS_RDONLY) {
 628                 reiserfs_warning(inode->i_sb, "clm-6006",
 629                                  "writing inode %lu on readonly FS",
 630                                  inode->i_ino);
 631                 return;
 632         }
 633         lock_depth = reiserfs_write_lock_once(inode->i_sb);
 634
 635         /* this is really only used for atime updates, so they don't have
 636          ** to be included in O_SYNC or fsync
 637          */
 638         err = journal_begin(&th, inode->i_sb, 1);
 639         if (err)
 640                 goto out;
 641
 642         reiserfs_update_sd(&th, inode);
 643         journal_end(&th, inode->i_sb, 1);
 644
 645 out:
 646         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 647 }
 648
 649 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 650 {
 651         struct super_block *s = root->d_sb;
 652         struct reiserfs_journal *journal = SB_JOURNAL(s);
 653         long opts = REISERFS_SB(s)->s_mount_opt;
 654
 655         if (opts & (1 << REISERFS_LARGETAIL))
 656                 seq_puts(seq, ",tails=on");
 657         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 658                 seq_puts(seq, ",notail");
 659         /* tails=small is default so we don't show it */
 660
 661         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 662                 seq_puts(seq, ",barrier=none");
 663         /* barrier=flush is default so we don't show it */
 664
 665         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 666                 seq_puts(seq, ",errors=continue");
 667         else if (opts & (1 << REISERFS_ERROR_PANIC))
 668                 seq_puts(seq, ",errors=panic");
 669         /* errors=ro is default so we don't show it */
 670
 671         if (opts & (1 << REISERFS_DATA_LOG))
 672                 seq_puts(seq, ",data=journal");
 673         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 674                 seq_puts(seq, ",data=writeback");
 675         /* data=ordered is default so we don't show it */
 676
 677         if (opts & (1 << REISERFS_ATTRS))
 678                 seq_puts(seq, ",attrs");
 679
 680         if (opts & (1 << REISERFS_XATTRS_USER))
 681                 seq_puts(seq, ",user_xattr");
 682
 683         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 684                 seq_puts(seq, ",expose_privroot");
 685
 686         if (opts & (1 << REISERFS_POSIXACL))
 687                 seq_puts(seq, ",acl");
 688
 689         if (REISERFS_SB(s)->s_jdev)
 690                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 691
 692         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 693                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 694
 695 #ifdef CONFIG_QUOTA
 696         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 697                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 698         else if (opts & (1 << REISERFS_USRQUOTA))
 699                 seq_puts(seq, ",usrquota");
 700         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 701                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 702         else if (opts & (1 << REISERFS_GRPQUOTA))
 703                 seq_puts(seq, ",grpquota");
 704         if (REISERFS_SB(s)->s_jquota_fmt) {
 705                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 706                         seq_puts(seq, ",jqfmt=vfsold");
 707                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 708                         seq_puts(seq, ",jqfmt=vfsv0");
 709         }
 710 #endif
 711
 712         /* Block allocator options */
 713         if (opts & (1 << REISERFS_NO_BORDER))
 714                 seq_puts(seq, ",block-allocator=noborder");
 715         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 716                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 717         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 718                 seq_puts(seq, ",block-allocator=hashed_relocation");
 719         if (opts & (1 << REISERFS_TEST4))
 720                 seq_puts(seq, ",block-allocator=test4");
 721         show_alloc_options(seq, s);
 722         return 0;
 723 }
 724
 725 #ifdef CONFIG_QUOTA
 726 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 727                                     size_t, loff_t);
 728 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 729                                    loff_t);
 730 #endif
 731
 732 static const struct super_operations reiserfs_sops = {
 733         .alloc_inode = reiserfs_alloc_inode,
 734         .destroy_inode = reiserfs_destroy_inode,
 735         .write_inode = reiserfs_write_inode,
 736         .dirty_inode = reiserfs_dirty_inode,
 737         .evict_inode = reiserfs_evict_inode,
 738         .put_super = reiserfs_put_super,
 739         .sync_fs = reiserfs_sync_fs,
 740         .freeze_fs = reiserfs_freeze,
 741         .unfreeze_fs = reiserfs_unfreeze,
 742         .statfs = reiserfs_statfs,
 743         .remount_fs = reiserfs_remount,
 744         .show_options = reiserfs_show_options,
 745 #ifdef CONFIG_QUOTA
 746         .quota_read = reiserfs_quota_read,
 747         .quota_write = reiserfs_quota_write,
 748 #endif
 749 };
 750
 751 #ifdef CONFIG_QUOTA
 752 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 753
 754 static int reiserfs_write_dquot(struct dquot *);
 755 static int reiserfs_acquire_dquot(struct dquot *);
 756 static int reiserfs_release_dquot(struct dquot *);
 757 static int reiserfs_mark_dquot_dirty(struct dquot *);
 758 static int reiserfs_write_info(struct super_block *, int);
 759 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 760
 761 static const struct dquot_operations reiserfs_quota_operations = {
 762         .write_dquot = reiserfs_write_dquot,
 763         .acquire_dquot = reiserfs_acquire_dquot,
 764         .release_dquot = reiserfs_release_dquot,
 765         .mark_dirty = reiserfs_mark_dquot_dirty,
 766         .write_info = reiserfs_write_info,
 767         .alloc_dquot    = dquot_alloc,
 768         .destroy_dquot  = dquot_destroy,
 769 };
 770
 771 static const struct quotactl_ops reiserfs_qctl_operations = {
 772         .quota_on = reiserfs_quota_on,
 773         .quota_off = dquot_quota_off,
 774         .quota_sync = dquot_quota_sync,
 775         .get_info = dquot_get_dqinfo,
 776         .set_info = dquot_set_dqinfo,
 777         .get_dqblk = dquot_get_dqblk,
 778         .set_dqblk = dquot_set_dqblk,
 779 };
 780 #endif
 781
 782 static const struct export_operations reiserfs_export_ops = {
 783         .encode_fh = reiserfs_encode_fh,
 784         .fh_to_dentry = reiserfs_fh_to_dentry,
 785         .fh_to_parent = reiserfs_fh_to_parent,
 786         .get_parent = reiserfs_get_parent,
 787 };
 788
 789 /* this struct is used in reiserfs_getopt () for containing the value for those
 790    mount options that have values rather than being toggles. */
 791 typedef struct {
 792         char *value;
 793         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 794                                    value is found, 0 is no bits are to be changed. */
 795         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 796                                    value is found, 0 is no bits are to be changed. This is
 797                                    applied BEFORE setmask */
 798 } arg_desc_t;
 799
 800 /* Set this bit in arg_required to allow empty arguments */
 801 #define REISERFS_OPT_ALLOWEMPTY 31
 802
 803 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 804    mount options */
 805 typedef struct {
 806         char *option_name;
 807         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 808         const arg_desc_t *values;       /* list of values accepted by an option */
 809         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 810                                    value is found, 0 is no bits are to be changed. */
 811         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 812                                    value is found, 0 is no bits are to be changed. This is
 813                                    applied BEFORE setmask */
 814 } opt_desc_t;
 815
 816 /* possible values for -o data= */
 817 static const arg_desc_t logging_mode[] = {
 818         {"ordered", 1 << REISERFS_DATA_ORDERED,
 819          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 820         {"journal", 1 << REISERFS_DATA_LOG,
 821          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 822         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 823          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 824         {.value = NULL}
 825 };
 826
 827 /* possible values for -o barrier= */
 828 static const arg_desc_t barrier_mode[] = {
 829         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 830         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 831         {.value = NULL}
 832 };
 833
 834 /* possible values for "-o block-allocator=" and bits which are to be set in
 835    s_mount_opt of reiserfs specific part of in-core super block */
 836 static const arg_desc_t balloc[] = {
 837         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 838         {"border", 0, 1 << REISERFS_NO_BORDER},
 839         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 840         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 841         {"test4", 1 << REISERFS_TEST4, 0},
 842         {"notest4", 0, 1 << REISERFS_TEST4},
 843         {NULL, 0, 0}
 844 };
 845
 846 static const arg_desc_t tails[] = {
 847         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 848         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 849         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 850         {NULL, 0, 0}
 851 };
 852
 853 static const arg_desc_t error_actions[] = {
 854         {"panic", 1 << REISERFS_ERROR_PANIC,
 855          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 856         {"ro-remount", 1 << REISERFS_ERROR_RO,
 857          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 858 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 859         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 860          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 861 #endif
 862         {NULL, 0, 0},
 863 };
 864
 865 /* proceed only one option from a list *cur - string containing of mount options
 866    opts - array of options which are accepted
 867    opt_arg - if option is found and requires an argument and if it is specifed
 868    in the input - pointer to the argument is stored here
 869    bit_flags - if option requires to set a certain bit - it is set here
 870    return -1 if unknown option is found, opt->arg_required otherwise */
 871 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 872                            char **opt_arg, unsigned long *bit_flags)
 873 {
 874         char *p;
 875         /* foo=bar,
 876            ^   ^  ^
 877            |   |  +-- option_end
 878            |   +-- arg_start
 879            +-- option_start
 880          */
 881         const opt_desc_t *opt;
 882         const arg_desc_t *arg;
 883
 884         p = *cur;
 885
 886         /* assume argument cannot contain commas */
 887         *cur = strchr(p, ',');
 888         if (*cur) {
 889                 *(*cur) = '\0';
 890                 (*cur)++;
 891         }
 892
 893         if (!strncmp(p, "alloc=", 6)) {
 894                 /* Ugly special case, probably we should redo options parser so that
 895                    it can understand several arguments for some options, also so that
 896                    it can fill several bitfields with option values. */
 897                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 898                         return -1;
 899                 } else {
 900                         return 0;
 901                 }
 902         }
 903
 904         /* for every option in the list */
 905         for (opt = opts; opt->option_name; opt++) {
 906                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 907                         if (bit_flags) {
 908                                 if (opt->clrmask ==
 909                                     (1 << REISERFS_UNSUPPORTED_OPT))
 910                                         reiserfs_warning(s, "super-6500",
 911                                                          "%s not supported.\n",
 912                                                          p);
 913                                 else
 914                                         *bit_flags &= ~opt->clrmask;
 915                                 if (opt->setmask ==
 916                                     (1 << REISERFS_UNSUPPORTED_OPT))
 917                                         reiserfs_warning(s, "super-6501",
 918                                                          "%s not supported.\n",
 919                                                          p);
 920                                 else
 921                                         *bit_flags |= opt->setmask;
 922                         }
 923                         break;
 924                 }
 925         }
 926         if (!opt->option_name) {
 927                 reiserfs_warning(s, "super-6502",
 928                                  "unknown mount option \"%s\"", p);
 929                 return -1;
 930         }
 931
 932         p += strlen(opt->option_name);
 933         switch (*p) {
 934         case '=':
 935                 if (!opt->arg_required) {
 936                         reiserfs_warning(s, "super-6503",
 937                                          "the option \"%s\" does not "
 938                                          "require an argument\n",
 939                                          opt->option_name);
 940                         return -1;
 941                 }
 942                 break;
 943
 944         case 0:
 945                 if (opt->arg_required) {
 946                         reiserfs_warning(s, "super-6504",
 947                                          "the option \"%s\" requires an "
 948                                          "argument\n", opt->option_name);
 949                         return -1;
 950                 }
 951                 break;
 952         default:
 953                 reiserfs_warning(s, "super-6505",
 954                                  "head of option \"%s\" is only correct\n",
 955                                  opt->option_name);
 956                 return -1;
 957         }
 958
 959         /* move to the argument, or to next option if argument is not required */
 960         p++;
 961
 962         if (opt->arg_required
 963             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 964             && !strlen(p)) {
 965                 /* this catches "option=," if not allowed */
 966                 reiserfs_warning(s, "super-6506",
 967                                  "empty argument for \"%s\"\n",
 968                                  opt->option_name);
 969                 return -1;
 970         }
 971
 972         if (!opt->values) {
 973                 /* *=NULLopt_arg contains pointer to argument */
 974                 *opt_arg = p;
 975                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 976         }
 977
 978         /* values possible for this option are listed in opt->values */
 979         for (arg = opt->values; arg->value; arg++) {
 980                 if (!strcmp(p, arg->value)) {
 981                         if (bit_flags) {
 982                                 *bit_flags &= ~arg->clrmask;
 983                                 *bit_flags |= arg->setmask;
 984                         }
 985                         return opt->arg_required;
 986                 }
 987         }
 988
 989         reiserfs_warning(s, "super-6506",
 990                          "bad value \"%s\" for option \"%s\"\n", p,
 991                          opt->option_name);
 992         return -1;
 993 }
 994
 995 /* returns 0 if something is wrong in option string, 1 - otherwise */
 996 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 997                                   unsigned long *mount_options,
 998                                   /* after the parsing phase, contains the
 999                                      collection of bitflags defining what
1000                                      mount options were selected. */
1001                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
1002                                   char **jdev_name,
1003                                   unsigned int *commit_max_age,
1004                                   char **qf_names,
1005                                   unsigned int *qfmt)
1006 {
1007         int c;
1008         char *arg = NULL;
1009         char *pos;
1010         opt_desc_t opts[] = {
1011                 /* Compatibility stuff, so that -o notail for old setups still work */
1012                 {"tails",.arg_required = 't',.values = tails},
1013                 {"notail",.clrmask =
1014                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1015                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1016                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1017                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1018                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1019 #ifdef CONFIG_REISERFS_FS_XATTR
1020                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1021                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1022 #else
1023                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1024                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1025 #endif
1026 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1027                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1028                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1029 #else
1030                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1031                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1032 #endif
1033                 {.option_name = "nolog"},
1034                 {"replayonly",.setmask = 1 << REPLAYONLY},
1035                 {"block-allocator",.arg_required = 'a',.values = balloc},
1036                 {"data",.arg_required = 'd',.values = logging_mode},
1037                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1038                 {"resize",.arg_required = 'r',.values = NULL},
1039                 {"jdev",.arg_required = 'j',.values = NULL},
1040                 {"nolargeio",.arg_required = 'w',.values = NULL},
1041                 {"commit",.arg_required = 'c',.values = NULL},
1042                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1043                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1044                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1045                 {"errors",.arg_required = 'e',.values = error_actions},
1046                 {"usrjquota",.arg_required =
1047                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1048                 {"grpjquota",.arg_required =
1049                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050                 {"jqfmt",.arg_required = 'f',.values = NULL},
1051                 {.option_name = NULL}
1052         };
1053
1054         *blocks = 0;
1055         if (!options || !*options)
1056                 /* use default configuration: create tails, journaling on, no
1057                    conversion to newest format */
1058                 return 1;
1059
1060         for (pos = options; pos;) {
1061                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1062                 if (c == -1)
1063                         /* wrong option is given */
1064                         return 0;
1065
1066                 if (c == 'r') {
1067                         char *p;
1068
1069                         p = NULL;
1070                         /* "resize=NNN" or "resize=auto" */
1071
1072                         if (!strcmp(arg, "auto")) {
1073                                 /* From JFS code, to auto-get the size. */
1074                                 *blocks =
1075                                     s->s_bdev->bd_inode->i_size >> s->
1076                                     s_blocksize_bits;
1077                         } else {
1078                                 *blocks = simple_strtoul(arg, &p, 0);
1079                                 if (*p != '\0') {
1080                                         /* NNN does not look like a number */
1081                                         reiserfs_warning(s, "super-6507",
1082                                                          "bad value %s for "
1083                                                          "-oresize\n", arg);
1084                                         return 0;
1085                                 }
1086                         }
1087                 }
1088
1089                 if (c == 'c') {
1090                         char *p = NULL;
1091                         unsigned long val = simple_strtoul(arg, &p, 0);
1092                         /* commit=NNN (time in seconds) */
1093                         if (*p != '\0' || val >= (unsigned int)-1) {
1094                                 reiserfs_warning(s, "super-6508",
1095                                                  "bad value %s for -ocommit\n",
1096                                                  arg);
1097                                 return 0;
1098                         }
1099                         *commit_max_age = (unsigned int)val;
1100                 }
1101
1102                 if (c == 'w') {
1103                         reiserfs_warning(s, "super-6509", "nolargeio option "
1104                                          "is no longer supported");
1105                         return 0;
1106                 }
1107
1108                 if (c == 'j') {
1109                         if (arg && *arg && jdev_name) {
1110                                 if (*jdev_name) {       //Hm, already assigned?
1111                                         reiserfs_warning(s, "super-6510",
1112                                                          "journal device was "
1113                                                          "already specified to "
1114                                                          "be %s", *jdev_name);
1115                                         return 0;
1116                                 }
1117                                 *jdev_name = arg;
1118                         }
1119                 }
1120 #ifdef CONFIG_QUOTA
1121                 if (c == 'u' || c == 'g') {
1122                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1123
1124                         if (sb_any_quota_loaded(s) &&
1125                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1126                                 reiserfs_warning(s, "super-6511",
1127                                                  "cannot change journaled "
1128                                                  "quota options when quota "
1129                                                  "turned on.");
1130                                 return 0;
1131                         }
1132                         if (*arg) {     /* Some filename specified? */
1133                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1134                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1135                                               arg)) {
1136                                         reiserfs_warning(s, "super-6512",
1137                                                          "%s quota file "
1138                                                          "already specified.",
1139                                                          QTYPE2NAME(qtype));
1140                                         return 0;
1141                                 }
1142                                 if (strchr(arg, '/')) {
1143                                         reiserfs_warning(s, "super-6513",
1144                                                          "quotafile must be "
1145                                                          "on filesystem root.");
1146                                         return 0;
1147                                 }
1148                                 qf_names[qtype] =
1149                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1150                                 if (!qf_names[qtype]) {
1151                                         reiserfs_warning(s, "reiserfs-2502",
1152                                                          "not enough memory "
1153                                                          "for storing "
1154                                                          "quotafile name.");
1155                                         return 0;
1156                                 }
1157                                 strcpy(qf_names[qtype], arg);
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         reiserfs_write_lock(s);
1322
1323 #ifdef CONFIG_QUOTA
1324         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1325 #endif
1326
1327         rs = SB_DISK_SUPER_BLOCK(s);
1328
1329         if (!reiserfs_parse_options
1330             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1331             qf_names, &qfmt)) {
1332 #ifdef CONFIG_QUOTA
1333                 for (i = 0; i < MAXQUOTAS; i++)
1334                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1335                                 kfree(qf_names[i]);
1336 #endif
1337                 err = -EINVAL;
1338                 goto out_unlock;
1339         }
1340 #ifdef CONFIG_QUOTA
1341         handle_quota_files(s, qf_names, &qfmt);
1342 #endif
1343
1344         handle_attrs(s);
1345
1346         /* Add options that are safe here */
1347         safe_mask |= 1 << REISERFS_SMALLTAIL;
1348         safe_mask |= 1 << REISERFS_LARGETAIL;
1349         safe_mask |= 1 << REISERFS_NO_BORDER;
1350         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1351         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1352         safe_mask |= 1 << REISERFS_TEST4;
1353         safe_mask |= 1 << REISERFS_ATTRS;
1354         safe_mask |= 1 << REISERFS_XATTRS_USER;
1355         safe_mask |= 1 << REISERFS_POSIXACL;
1356         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1357         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1358         safe_mask |= 1 << REISERFS_ERROR_RO;
1359         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1360         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1361         safe_mask |= 1 << REISERFS_USRQUOTA;
1362         safe_mask |= 1 << REISERFS_GRPQUOTA;
1363
1364         /* Update the bitmask, taking care to keep
1365          * the bits we're not allowed to change here */
1366         REISERFS_SB(s)->s_mount_opt =
1367             (REISERFS_SB(s)->
1368              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1369
1370         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1371                 journal->j_max_commit_age = commit_max_age;
1372                 journal->j_max_trans_age = commit_max_age;
1373         } else if (commit_max_age == 0) {
1374                 /* 0 means restore defaults. */
1375                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1376                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1377         }
1378
1379         if (blocks) {
1380                 err = reiserfs_resize(s, blocks);
1381                 if (err != 0)
1382                         goto out_unlock;
1383         }
1384
1385         if (*mount_flags & MS_RDONLY) {
1386                 reiserfs_xattr_init(s, *mount_flags);
1387                 /* remount read-only */
1388                 if (s->s_flags & MS_RDONLY)
1389                         /* it is read-only already */
1390                         goto out_ok;
1391
1392                 /*
1393                  * Drop write lock. Quota will retake it when needed and lock
1394                  * ordering requires calling dquot_suspend() without it.
1395                  */
1396                 reiserfs_write_unlock(s);
1397                 err = dquot_suspend(s, -1);
1398                 if (err < 0)
1399                         goto out_err;
1400                 reiserfs_write_lock(s);
1401
1402                 /* try to remount file system with read-only permissions */
1403                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1404                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1405                         goto out_ok;
1406                 }
1407
1408                 err = journal_begin(&th, s, 10);
1409                 if (err)
1410                         goto out_unlock;
1411
1412                 /* Mounting a rw partition read-only. */
1413                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1414                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1415                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1416         } else {
1417                 /* remount read-write */
1418                 if (!(s->s_flags & MS_RDONLY)) {
1419                         reiserfs_xattr_init(s, *mount_flags);
1420                         goto out_ok;    /* We are read-write already */
1421                 }
1422
1423                 if (reiserfs_is_journal_aborted(journal)) {
1424                         err = journal->j_errno;
1425                         goto out_unlock;
1426                 }
1427
1428                 handle_data_mode(s, mount_options);
1429                 handle_barrier_mode(s, mount_options);
1430                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1431                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1432                 err = journal_begin(&th, s, 10);
1433                 if (err)
1434                         goto out_unlock;
1435
1436                 /* Mount a partition which is read-only, read-write */
1437                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1438                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1439                 s->s_flags &= ~MS_RDONLY;
1440                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1441                 if (!old_format_only(s))
1442                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1443                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1444                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1445                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1446         }
1447         /* this will force a full flush of all journal lists */
1448         SB_JOURNAL(s)->j_must_wait = 1;
1449         err = journal_end(&th, s, 10);
1450         if (err)
1451                 goto out_unlock;
1452
1453         if (!(*mount_flags & MS_RDONLY)) {
1454                 /*
1455                  * Drop write lock. Quota will retake it when needed and lock
1456                  * ordering requires calling dquot_resume() without it.
1457                  */
1458                 reiserfs_write_unlock(s);
1459                 dquot_resume(s, -1);
1460                 reiserfs_write_lock(s);
1461                 finish_unfinished(s);
1462                 reiserfs_xattr_init(s, *mount_flags);
1463         }
1464
1465 out_ok:
1466         replace_mount_options(s, new_opts);
1467         reiserfs_write_unlock(s);
1468         return 0;
1469
1470 out_unlock:
1471         reiserfs_write_unlock(s);
1472 out_err:
1473         kfree(new_opts);
1474         return err;
1475 }
1476
1477 static int read_super_block(struct super_block *s, int offset)
1478 {
1479         struct buffer_head *bh;
1480         struct reiserfs_super_block *rs;
1481         int fs_blocksize;
1482
1483         bh = sb_bread(s, offset / s->s_blocksize);
1484         if (!bh) {
1485                 reiserfs_warning(s, "sh-2006",
1486                                  "bread failed (dev %s, block %lu, size %lu)",
1487                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1488                                  s->s_blocksize);
1489                 return 1;
1490         }
1491
1492         rs = (struct reiserfs_super_block *)bh->b_data;
1493         if (!is_any_reiserfs_magic_string(rs)) {
1494                 brelse(bh);
1495                 return 1;
1496         }
1497         //
1498         // ok, reiserfs signature (old or new) found in at the given offset
1499         //
1500         fs_blocksize = sb_blocksize(rs);
1501         brelse(bh);
1502         sb_set_blocksize(s, fs_blocksize);
1503
1504         bh = sb_bread(s, offset / s->s_blocksize);
1505         if (!bh) {
1506                 reiserfs_warning(s, "sh-2007",
1507                                  "bread failed (dev %s, block %lu, size %lu)",
1508                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1509                                  s->s_blocksize);
1510                 return 1;
1511         }
1512
1513         rs = (struct reiserfs_super_block *)bh->b_data;
1514         if (sb_blocksize(rs) != s->s_blocksize) {
1515                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1516                                  "filesystem on (dev %s, block %Lu, size %lu)",
1517                                  reiserfs_bdevname(s),
1518                                  (unsigned long long)bh->b_blocknr,
1519                                  s->s_blocksize);
1520                 brelse(bh);
1521                 return 1;
1522         }
1523
1524         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1525                 brelse(bh);
1526                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1527                                  "--rebuild-tree run detected. Please run\n"
1528                                  "reiserfsck --rebuild-tree and wait for a "
1529                                  "completion. If that fails\n"
1530                                  "get newer reiserfsprogs package");
1531                 return 1;
1532         }
1533
1534         SB_BUFFER_WITH_SB(s) = bh;
1535         SB_DISK_SUPER_BLOCK(s) = rs;
1536
1537         if (is_reiserfs_jr(rs)) {
1538                 /* magic is of non-standard journal filesystem, look at s_version to
1539                    find which format is in use */
1540                 if (sb_version(rs) == REISERFS_VERSION_2)
1541                         reiserfs_info(s, "found reiserfs format \"3.6\""
1542                                       " with non-standard journal\n");
1543                 else if (sb_version(rs) == REISERFS_VERSION_1)
1544                         reiserfs_info(s, "found reiserfs format \"3.5\""
1545                                       " with non-standard journal\n");
1546                 else {
1547                         reiserfs_warning(s, "sh-2012", "found unknown "
1548                                          "format \"%u\" of reiserfs with "
1549                                          "non-standard magic", sb_version(rs));
1550                         return 1;
1551                 }
1552         } else
1553                 /* s_version of standard format may contain incorrect information,
1554                    so we just look at the magic string */
1555                 reiserfs_info(s,
1556                               "found reiserfs format \"%s\" with standard journal\n",
1557                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1558
1559         s->s_op = &reiserfs_sops;
1560         s->s_export_op = &reiserfs_export_ops;
1561 #ifdef CONFIG_QUOTA
1562         s->s_qcop = &reiserfs_qctl_operations;
1563         s->dq_op = &reiserfs_quota_operations;
1564 #endif
1565
1566         /* new format is limited by the 32 bit wide i_blocks field, want to
1567          ** be one full block below that.
1568          */
1569         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1570         return 0;
1571 }
1572
1573 /* after journal replay, reread all bitmap and super blocks */
1574 static int reread_meta_blocks(struct super_block *s)
1575 {
1576         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1577         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1578         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1579                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1580                 return 1;
1581         }
1582
1583         return 0;
1584 }
1585
1586 /////////////////////////////////////////////////////
1587 // hash detection stuff
1588
1589 // if root directory is empty - we set default - Yura's - hash and
1590 // warn about it
1591 // FIXME: we look for only one name in a directory. If tea and yura
1592 // bith have the same value - we ask user to send report to the
1593 // mailing list
1594 static __u32 find_hash_out(struct super_block *s)
1595 {
1596         int retval;
1597         struct inode *inode;
1598         struct cpu_key key;
1599         INITIALIZE_PATH(path);
1600         struct reiserfs_dir_entry de;
1601         __u32 hash = DEFAULT_HASH;
1602
1603         inode = s->s_root->d_inode;
1604
1605         do {                    // Some serious "goto"-hater was there ;)
1606                 u32 teahash, r5hash, yurahash;
1607
1608                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1609                 retval = search_by_entry_key(s, &key, &path, &de);
1610                 if (retval == IO_ERROR) {
1611                         pathrelse(&path);
1612                         return UNSET_HASH;
1613                 }
1614                 if (retval == NAME_NOT_FOUND)
1615                         de.de_entry_num--;
1616                 set_de_name_and_namelen(&de);
1617                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1618                         /* allow override in this case */
1619                         if (reiserfs_rupasov_hash(s)) {
1620                                 hash = YURA_HASH;
1621                         }
1622                         reiserfs_info(s, "FS seems to be empty, autodetect "
1623                                          "is using the default hash\n");
1624                         break;
1625                 }
1626                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1627                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1628                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1629                 if (((teahash == r5hash)
1630                      &&
1631                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1632                       == r5hash)) || ((teahash == yurahash)
1633                                       && (yurahash ==
1634                                           GET_HASH_VALUE(deh_offset
1635                                                          (&
1636                                                           (de.
1637                                                            de_deh[de.
1638                                                                   de_entry_num])))))
1639                     || ((r5hash == yurahash)
1640                         && (yurahash ==
1641                             GET_HASH_VALUE(deh_offset
1642                                            (&(de.de_deh[de.de_entry_num])))))) {
1643                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1644                                          "automatically detect hash function. "
1645                                          "Please mount with -o "
1646                                          "hash={tea,rupasov,r5}");
1647                         hash = UNSET_HASH;
1648                         break;
1649                 }
1650                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1651                     yurahash)
1652                         hash = YURA_HASH;
1653                 else if (GET_HASH_VALUE
1654                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1655                         hash = TEA_HASH;
1656                 else if (GET_HASH_VALUE
1657                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1658                         hash = R5_HASH;
1659                 else {
1660                         reiserfs_warning(s, "reiserfs-2506",
1661                                          "Unrecognised hash function");
1662                         hash = UNSET_HASH;
1663                 }
1664         } while (0);
1665
1666         pathrelse(&path);
1667         return hash;
1668 }
1669
1670 // finds out which hash names are sorted with
1671 static int what_hash(struct super_block *s)
1672 {
1673         __u32 code;
1674
1675         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1676
1677         /* reiserfs_hash_detect() == true if any of the hash mount options
1678          ** were used.  We must check them to make sure the user isn't
1679          ** using a bad hash value
1680          */
1681         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1682                 code = find_hash_out(s);
1683
1684         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1685                 /* detection has found the hash, and we must check against the
1686                  ** mount options
1687                  */
1688                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1689                         reiserfs_warning(s, "reiserfs-2507",
1690                                          "Error, %s hash detected, "
1691                                          "unable to force rupasov hash",
1692                                          reiserfs_hashname(code));
1693                         code = UNSET_HASH;
1694                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1695                         reiserfs_warning(s, "reiserfs-2508",
1696                                          "Error, %s hash detected, "
1697                                          "unable to force tea hash",
1698                                          reiserfs_hashname(code));
1699                         code = UNSET_HASH;
1700                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1701                         reiserfs_warning(s, "reiserfs-2509",
1702                                          "Error, %s hash detected, "
1703                                          "unable to force r5 hash",
1704                                          reiserfs_hashname(code));
1705                         code = UNSET_HASH;
1706                 }
1707         } else {
1708                 /* find_hash_out was not called or could not determine the hash */
1709                 if (reiserfs_rupasov_hash(s)) {
1710                         code = YURA_HASH;
1711                 } else if (reiserfs_tea_hash(s)) {
1712                         code = TEA_HASH;
1713                 } else if (reiserfs_r5_hash(s)) {
1714                         code = R5_HASH;
1715                 }
1716         }
1717
1718         /* if we are mounted RW, and we have a new valid hash code, update
1719          ** the super
1720          */
1721         if (code != UNSET_HASH &&
1722             !(s->s_flags & MS_RDONLY) &&
1723             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1724                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1725         }
1726         return code;
1727 }
1728
1729 // return pointer to appropriate function
1730 static hashf_t hash_function(struct super_block *s)
1731 {
1732         switch (what_hash(s)) {
1733         case TEA_HASH:
1734                 reiserfs_info(s, "Using tea hash to sort names\n");
1735                 return keyed_hash;
1736         case YURA_HASH:
1737                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1738                 return yura_hash;
1739         case R5_HASH:
1740                 reiserfs_info(s, "Using r5 hash to sort names\n");
1741                 return r5_hash;
1742         }
1743         return NULL;
1744 }
1745
1746 // this is used to set up correct value for old partitions
1747 static int function2code(hashf_t func)
1748 {
1749         if (func == keyed_hash)
1750                 return TEA_HASH;
1751         if (func == yura_hash)
1752                 return YURA_HASH;
1753         if (func == r5_hash)
1754                 return R5_HASH;
1755
1756         BUG();                  // should never happen
1757
1758         return 0;
1759 }
1760
1761 #define SWARN(silent, s, id, ...)                       \
1762         if (!(silent))                          \
1763                 reiserfs_warning(s, id, __VA_ARGS__)
1764
1765 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1766 {
1767         struct inode *root_inode;
1768         struct reiserfs_transaction_handle th;
1769         int old_format = 0;
1770         unsigned long blocks;
1771         unsigned int commit_max_age = 0;
1772         int jinit_done = 0;
1773         struct reiserfs_iget_args args;
1774         struct reiserfs_super_block *rs;
1775         char *jdev_name;
1776         struct reiserfs_sb_info *sbi;
1777         int errval = -EINVAL;
1778         char *qf_names[MAXQUOTAS] = {};
1779         unsigned int qfmt = 0;
1780
1781         save_mount_options(s, data);
1782
1783         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1784         if (!sbi)
1785                 return -ENOMEM;
1786         s->s_fs_info = sbi;
1787         /* Set default values for options: non-aggressive tails, RO on errors */
1788         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1789         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1790         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1791         /* no preallocation minimum, be smart in
1792            reiserfs_file_write instead */
1793         sbi->s_alloc_options.preallocmin = 0;
1794         /* Preallocate by 16 blocks (17-1) at once */
1795         sbi->s_alloc_options.preallocsize = 17;
1796         /* setup default block allocator options */
1797         reiserfs_init_alloc_options(s);
1798
1799         spin_lock_init(&sbi->old_work_lock);
1800         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1801         mutex_init(&sbi->lock);
1802         sbi->lock_depth = -1;
1803
1804         jdev_name = NULL;
1805         if (reiserfs_parse_options
1806             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1807              &commit_max_age, qf_names, &qfmt) == 0) {
1808                 goto error_unlocked;
1809         }
1810         if (jdev_name && jdev_name[0]) {
1811                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1812                 if (!sbi->s_jdev) {
1813                         SWARN(silent, s, "", "Cannot allocate memory for "
1814                                 "journal device name");
1815                         goto error;
1816                 }
1817         }
1818 #ifdef CONFIG_QUOTA
1819         handle_quota_files(s, qf_names, &qfmt);
1820 #endif
1821
1822         if (blocks) {
1823                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1824                 goto error_unlocked;
1825         }
1826
1827         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1828         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1829                 old_format = 1;
1830         /* try new format (64-th 1k block), which can contain reiserfs super block */
1831         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1832                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1833                       reiserfs_bdevname(s));
1834                 goto error_unlocked;
1835         }
1836
1837         rs = SB_DISK_SUPER_BLOCK(s);
1838         /* Let's do basic sanity check to verify that underlying device is not
1839            smaller than the filesystem. If the check fails then abort and scream,
1840            because bad stuff will happen otherwise. */
1841         if (s->s_bdev && s->s_bdev->bd_inode
1842             && i_size_read(s->s_bdev->bd_inode) <
1843             sb_block_count(rs) * sb_blocksize(rs)) {
1844                 SWARN(silent, s, "", "Filesystem cannot be "
1845                       "mounted because it is bigger than the device");
1846                 SWARN(silent, s, "", "You may need to run fsck "
1847                       "or increase size of your LVM partition");
1848                 SWARN(silent, s, "", "Or may be you forgot to "
1849                       "reboot after fdisk when it told you to");
1850                 goto error_unlocked;
1851         }
1852
1853         sbi->s_mount_state = SB_REISERFS_STATE(s);
1854         sbi->s_mount_state = REISERFS_VALID_FS;
1855
1856         if ((errval = reiserfs_init_bitmap_cache(s))) {
1857                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1858                 goto error_unlocked;
1859         }
1860
1861         errval = -EINVAL;
1862 #ifdef CONFIG_REISERFS_CHECK
1863         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1864         SWARN(silent, s, "", "- it is slow mode for debugging.");
1865 #endif
1866
1867         /* make data=ordered the default */
1868         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1869             !reiserfs_data_writeback(s)) {
1870                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1871         }
1872
1873         if (reiserfs_data_log(s)) {
1874                 reiserfs_info(s, "using journaled data mode\n");
1875         } else if (reiserfs_data_ordered(s)) {
1876                 reiserfs_info(s, "using ordered data mode\n");
1877         } else {
1878                 reiserfs_info(s, "using writeback data mode\n");
1879         }
1880         if (reiserfs_barrier_flush(s)) {
1881                 printk("reiserfs: using flush barriers\n");
1882         }
1883
1884         // set_device_ro(s->s_dev, 1) ;
1885         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1886                 SWARN(silent, s, "sh-2022",
1887                       "unable to initialize journal space");
1888                 goto error_unlocked;
1889         } else {
1890                 jinit_done = 1; /* once this is set, journal_release must be called
1891                                  ** if we error out of the mount
1892                                  */
1893         }
1894
1895         if (reread_meta_blocks(s)) {
1896                 SWARN(silent, s, "jmacd-9",
1897                       "unable to reread meta blocks after journal init");
1898                 goto error_unlocked;
1899         }
1900
1901         if (replay_only(s))
1902                 goto error_unlocked;
1903
1904         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1905                 SWARN(silent, s, "clm-7000",
1906                       "Detected readonly device, marking FS readonly");
1907                 s->s_flags |= MS_RDONLY;
1908         }
1909         args.objectid = REISERFS_ROOT_OBJECTID;
1910         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1911         root_inode =
1912             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1913                          reiserfs_init_locked_inode, (void *)(&args));
1914         if (!root_inode) {
1915                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1916                 goto error_unlocked;
1917         }
1918
1919         /*
1920          * This path assumed to be called with the BKL in the old times.
1921          * Now we have inherited the big reiserfs lock from it and many
1922          * reiserfs helpers called in the mount path and elsewhere require
1923          * this lock to be held even if it's not always necessary. Let's be
1924          * conservative and hold it early. The window can be reduced after
1925          * careful review of the code.
1926          */
1927         reiserfs_write_lock(s);
1928
1929         if (root_inode->i_state & I_NEW) {
1930                 reiserfs_read_locked_inode(root_inode, &args);
1931                 unlock_new_inode(root_inode);
1932         }
1933
1934         s->s_root = d_make_root(root_inode);
1935         if (!s->s_root)
1936                 goto error;
1937         // define and initialize hash function
1938         sbi->s_hash_function = hash_function(s);
1939         if (sbi->s_hash_function == NULL) {
1940                 dput(s->s_root);
1941                 s->s_root = NULL;
1942                 goto error;
1943         }
1944
1945         if (is_reiserfs_3_5(rs)
1946             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1947                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1948         else if (old_format)
1949                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1950         else
1951                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1952
1953         if (!(s->s_flags & MS_RDONLY)) {
1954
1955                 errval = journal_begin(&th, s, 1);
1956                 if (errval) {
1957                         dput(s->s_root);
1958                         s->s_root = NULL;
1959                         goto error;
1960                 }
1961                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1962
1963                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1964                 set_sb_fs_state(rs, 0);
1965
1966                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1967                  * case, but older revisions can't. This will cause the
1968                  * file system to fail mount on those older implementations,
1969                  * avoiding corruption. -jeffm */
1970                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1971                     sb_bmap_nr(rs) != 0) {
1972                         reiserfs_warning(s, "super-2030", "This file system "
1973                                         "claims to use %u bitmap blocks in "
1974                                         "its super block, but requires %u. "
1975                                         "Clearing to zero.", sb_bmap_nr(rs),
1976                                         reiserfs_bmap_count(s));
1977
1978                         set_sb_bmap_nr(rs, 0);
1979                 }
1980
1981                 if (old_format_only(s)) {
1982                         /* filesystem of format 3.5 either with standard or non-standard
1983                            journal */
1984                         if (convert_reiserfs(s)) {
1985                                 /* and -o conv is given */
1986                                 if (!silent)
1987                                         reiserfs_info(s,
1988                                                       "converting 3.5 filesystem to the 3.6 format");
1989
1990                                 if (is_reiserfs_3_5(rs))
1991                                         /* put magic string of 3.6 format. 2.2 will not be able to
1992                                            mount this filesystem anymore */
1993                                         memcpy(rs->s_v1.s_magic,
1994                                                reiserfs_3_6_magic_string,
1995                                                sizeof
1996                                                (reiserfs_3_6_magic_string));
1997
1998                                 set_sb_version(rs, REISERFS_VERSION_2);
1999                                 reiserfs_convert_objectid_map_v1(s);
2000                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
2001                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
2002                         } else if (!silent) {
2003                                 reiserfs_info(s, "using 3.5.x disk format\n");
2004                         }
2005                 } else
2006                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2007
2008
2009                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2010                 errval = journal_end(&th, s, 1);
2011                 if (errval) {
2012                         dput(s->s_root);
2013                         s->s_root = NULL;
2014                         goto error;
2015                 }
2016
2017                 if ((errval = reiserfs_lookup_privroot(s)) ||
2018                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2019                         dput(s->s_root);
2020                         s->s_root = NULL;
2021                         goto error;
2022                 }
2023
2024                 /* look for files which were to be removed in previous session */
2025                 finish_unfinished(s);
2026         } else {
2027                 if (old_format_only(s) && !silent) {
2028                         reiserfs_info(s, "using 3.5.x disk format\n");
2029                 }
2030
2031                 if ((errval = reiserfs_lookup_privroot(s)) ||
2032                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2033                         dput(s->s_root);
2034                         s->s_root = NULL;
2035                         goto error;
2036                 }
2037         }
2038         // mark hash in super block: it could be unset. overwrite should be ok
2039         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2040
2041         handle_attrs(s);
2042
2043         reiserfs_proc_info_init(s);
2044
2045         init_waitqueue_head(&(sbi->s_wait));
2046         spin_lock_init(&sbi->bitmap_lock);
2047
2048         reiserfs_write_unlock(s);
2049
2050         return (0);
2051
2052 error:
2053         reiserfs_write_unlock(s);
2054
2055 error_unlocked:
2056         /* kill the commit thread, free journal ram */
2057         if (jinit_done) {
2058                 reiserfs_write_lock(s);
2059                 journal_release_error(NULL, s);
2060                 reiserfs_write_unlock(s);
2061         }
2062
2063         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2064
2065         reiserfs_free_bitmap_cache(s);
2066         if (SB_BUFFER_WITH_SB(s))
2067                 brelse(SB_BUFFER_WITH_SB(s));
2068 #ifdef CONFIG_QUOTA
2069         {
2070                 int j;
2071                 for (j = 0; j < MAXQUOTAS; j++)
2072                         kfree(qf_names[j]);
2073         }
2074 #endif
2075         kfree(sbi);
2076
2077         s->s_fs_info = NULL;
2078         return errval;
2079 }
2080
2081 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2082 {
2083         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2084
2085         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2086         buf->f_bfree = sb_free_blocks(rs);
2087         buf->f_bavail = buf->f_bfree;
2088         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2089         buf->f_bsize = dentry->d_sb->s_blocksize;
2090         /* changed to accommodate gcc folks. */
2091         buf->f_type = REISERFS_SUPER_MAGIC;
2092         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2093         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2094                                 sizeof(rs->s_uuid)/2);
2095
2096         return 0;
2097 }
2098
2099 #ifdef CONFIG_QUOTA
2100 static int reiserfs_write_dquot(struct dquot *dquot)
2101 {
2102         struct reiserfs_transaction_handle th;
2103         int ret, err;
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         ret = dquot_commit(dquot);
2112         err =
2113             journal_end(&th, dquot->dq_sb,
2114                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2115         if (!ret && err)
2116                 ret = err;
2117       out:
2118         reiserfs_write_unlock(dquot->dq_sb);
2119         return ret;
2120 }
2121
2122 static int reiserfs_acquire_dquot(struct dquot *dquot)
2123 {
2124         struct reiserfs_transaction_handle th;
2125         int ret, err;
2126
2127         reiserfs_write_lock(dquot->dq_sb);
2128         ret =
2129             journal_begin(&th, dquot->dq_sb,
2130                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2131         if (ret)
2132                 goto out;
2133         ret = dquot_acquire(dquot);
2134         err =
2135             journal_end(&th, dquot->dq_sb,
2136                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2137         if (!ret && err)
2138                 ret = err;
2139       out:
2140         reiserfs_write_unlock(dquot->dq_sb);
2141         return ret;
2142 }
2143
2144 static int reiserfs_release_dquot(struct dquot *dquot)
2145 {
2146         struct reiserfs_transaction_handle th;
2147         int ret, err;
2148
2149         reiserfs_write_lock(dquot->dq_sb);
2150         ret =
2151             journal_begin(&th, dquot->dq_sb,
2152                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2153         if (ret) {
2154                 /* Release dquot anyway to avoid endless cycle in dqput() */
2155                 dquot_release(dquot);
2156                 goto out;
2157         }
2158         ret = dquot_release(dquot);
2159         err =
2160             journal_end(&th, dquot->dq_sb,
2161                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2162         if (!ret && err)
2163                 ret = err;
2164       out:
2165         reiserfs_write_unlock(dquot->dq_sb);
2166         return ret;
2167 }
2168
2169 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2170 {
2171         /* Are we journaling quotas? */
2172         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2173             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2174                 dquot_mark_dquot_dirty(dquot);
2175                 return reiserfs_write_dquot(dquot);
2176         } else
2177                 return dquot_mark_dquot_dirty(dquot);
2178 }
2179
2180 static int reiserfs_write_info(struct super_block *sb, int type)
2181 {
2182         struct reiserfs_transaction_handle th;
2183         int ret, err;
2184
2185         /* Data block + inode block */
2186         reiserfs_write_lock(sb);
2187         ret = journal_begin(&th, sb, 2);
2188         if (ret)
2189                 goto out;
2190         ret = dquot_commit_info(sb, type);
2191         err = journal_end(&th, sb, 2);
2192         if (!ret && err)
2193                 ret = err;
2194       out:
2195         reiserfs_write_unlock(sb);
2196         return ret;
2197 }
2198
2199 /*
2200  * Turn on quotas during mount time - we need to find the quota file and such...
2201  */
2202 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2203 {
2204         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2205                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2206 }
2207
2208 /*
2209  * Standard function to be called on quota_on
2210  */
2211 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2212                              struct path *path)
2213 {
2214         int err;
2215         struct inode *inode;
2216         struct reiserfs_transaction_handle th;
2217         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2218
2219         reiserfs_write_lock(sb);
2220         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2221                 err = -EINVAL;
2222                 goto out;
2223         }
2224
2225         /* Quotafile not on the same filesystem? */
2226         if (path->dentry->d_sb != sb) {
2227                 err = -EXDEV;
2228                 goto out;
2229         }
2230         inode = path->dentry->d_inode;
2231         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2232         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2233                 err = reiserfs_unpack(inode, NULL);
2234                 if (err) {
2235                         reiserfs_warning(sb, "super-6520",
2236                                 "Unpacking tail of quota file failed"
2237                                 " (%d). Cannot turn on quotas.", err);
2238                         err = -EINVAL;
2239                         goto out;
2240                 }
2241                 mark_inode_dirty(inode);
2242         }
2243         /* Journaling quota? */
2244         if (REISERFS_SB(sb)->s_qf_names[type]) {
2245                 /* Quotafile not of fs root? */
2246                 if (path->dentry->d_parent != sb->s_root)
2247                         reiserfs_warning(sb, "super-6521",
2248                                  "Quota file not on filesystem root. "
2249                                  "Journalled quota will not work.");
2250         }
2251
2252         /*
2253          * When we journal data on quota file, we have to flush journal to see
2254          * all updates to the file when we bypass pagecache...
2255          */
2256         if (reiserfs_file_data_log(inode)) {
2257                 /* Just start temporary transaction and finish it */
2258                 err = journal_begin(&th, sb, 1);
2259                 if (err)
2260                         goto out;
2261                 err = journal_end_sync(&th, sb, 1);
2262                 if (err)
2263                         goto out;
2264         }
2265         reiserfs_write_unlock(sb);
2266         return dquot_quota_on(sb, type, format_id, path);
2267 out:
2268         reiserfs_write_unlock(sb);
2269         return err;
2270 }
2271
2272 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2273  * acquiring the locks... As quota files are never truncated and quota code
2274  * itself serializes the operations (and no one else should touch the files)
2275  * we don't have to be afraid of races */
2276 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2277                                    size_t len, loff_t off)
2278 {
2279         struct inode *inode = sb_dqopt(sb)->files[type];
2280         unsigned long blk = off >> sb->s_blocksize_bits;
2281         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2282         size_t toread;
2283         struct buffer_head tmp_bh, *bh;
2284         loff_t i_size = i_size_read(inode);
2285
2286         if (off > i_size)
2287                 return 0;
2288         if (off + len > i_size)
2289                 len = i_size - off;
2290         toread = len;
2291         while (toread > 0) {
2292                 tocopy =
2293                     sb->s_blocksize - offset <
2294                     toread ? sb->s_blocksize - offset : toread;
2295                 tmp_bh.b_state = 0;
2296                 /* Quota files are without tails so we can safely use this function */
2297                 reiserfs_write_lock(sb);
2298                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2299                 reiserfs_write_unlock(sb);
2300                 if (err)
2301                         return err;
2302                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2303                         memset(data, 0, tocopy);
2304                 else {
2305                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2306                         if (!bh)
2307                                 return -EIO;
2308                         memcpy(data, bh->b_data + offset, tocopy);
2309                         brelse(bh);
2310                 }
2311                 offset = 0;
2312                 toread -= tocopy;
2313                 data += tocopy;
2314                 blk++;
2315         }
2316         return len;
2317 }
2318
2319 /* Write to quotafile (we know the transaction is already started and has
2320  * enough credits) */
2321 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2322                                     const char *data, size_t len, loff_t off)
2323 {
2324         struct inode *inode = sb_dqopt(sb)->files[type];
2325         unsigned long blk = off >> sb->s_blocksize_bits;
2326         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2327         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2328         size_t towrite = len;
2329         struct buffer_head tmp_bh, *bh;
2330
2331         if (!current->journal_info) {
2332                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2333                         " cancelled because transaction is not started.\n",
2334                         (unsigned long long)off, (unsigned long long)len);
2335                 return -EIO;
2336         }
2337         while (towrite > 0) {
2338                 tocopy = sb->s_blocksize - offset < towrite ?
2339                     sb->s_blocksize - offset : towrite;
2340                 tmp_bh.b_state = 0;
2341                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2342                 if (err)
2343                         goto out;
2344                 if (offset || tocopy != sb->s_blocksize)
2345                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2346                 else
2347                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2348                 if (!bh) {
2349                         err = -EIO;
2350                         goto out;
2351                 }
2352                 lock_buffer(bh);
2353                 memcpy(bh->b_data + offset, data, tocopy);
2354                 flush_dcache_page(bh->b_page);
2355                 set_buffer_uptodate(bh);
2356                 unlock_buffer(bh);
2357                 reiserfs_prepare_for_journal(sb, bh, 1);
2358                 journal_mark_dirty(current->journal_info, sb, bh);
2359                 if (!journal_quota)
2360                         reiserfs_add_ordered_list(inode, bh);
2361                 brelse(bh);
2362                 offset = 0;
2363                 towrite -= tocopy;
2364                 data += tocopy;
2365                 blk++;
2366         }
2367 out:
2368         if (len == towrite)
2369                 return err;
2370         if (inode->i_size < off + len - towrite)
2371                 i_size_write(inode, off + len - towrite);
2372         inode->i_version++;
2373         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2374         mark_inode_dirty(inode);
2375         return len - towrite;
2376 }
2377
2378 #endif
2379
2380 static struct dentry *get_super_block(struct file_system_type *fs_type,
2381                            int flags, const char *dev_name,
2382                            void *data)
2383 {
2384         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2385 }
2386
2387 static int __init init_reiserfs_fs(void)
2388 {
2389         int ret;
2390
2391         if ((ret = init_inodecache())) {
2392                 return ret;
2393         }
2394
2395         reiserfs_proc_info_global_init();
2396
2397         ret = register_filesystem(&reiserfs_fs_type);
2398
2399         if (ret == 0) {
2400                 return 0;
2401         }
2402
2403         reiserfs_proc_info_global_done();
2404         destroy_inodecache();
2405
2406         return ret;
2407 }
2408
2409 static void __exit exit_reiserfs_fs(void)
2410 {
2411         reiserfs_proc_info_global_done();
2412         unregister_filesystem(&reiserfs_fs_type);
2413         destroy_inodecache();
2414 }
2415
2416 struct file_system_type reiserfs_fs_type = {
2417         .owner = THIS_MODULE,
2418         .name = "reiserfs",
2419         .mount = get_super_block,
2420         .kill_sb = reiserfs_kill_sb,
2421         .fs_flags = FS_REQUIRES_DEV,
2422 };
2423
2424 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2425 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2426 MODULE_LICENSE("GPL");
2427
2428 module_init(init_reiserfs_fs);
2429 module_exit(exit_reiserfs_fs);