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