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 <linux/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/buffer_head.h>
  25 #include <linux/exportfs.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/vfs.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.h>
  31 #include <linux/seq_file.h>
  32
  33 struct file_system_type reiserfs_fs_type;
  34
  35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  38
  39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  40 {
  41         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  42                         strlen(reiserfs_3_5_magic_string));
  43 }
  44
  45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  46 {
  47         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  48                         strlen(reiserfs_3_6_magic_string));
  49 }
  50
  51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  52 {
  53         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  54                         strlen(reiserfs_jr_magic_string));
  55 }
  56
  57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  58 {
  59         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  60                 is_reiserfs_jr(rs));
  61 }
  62
  63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  65
  66 static int reiserfs_sync_fs(struct super_block *s, int wait)
  67 {
  68         struct reiserfs_transaction_handle th;
  69
  70         /*
  71          * Writeback quota in non-journalled quota case - journalled quota has
  72          * no dirty dquots
  73          */
  74         dquot_writeback_dquots(s, -1);
  75         reiserfs_write_lock(s);
  76         if (!journal_begin(&th, s, 1))
  77                 if (!journal_end_sync(&th))
  78                         reiserfs_flush_old_commits(s);
  79         reiserfs_write_unlock(s);
  80         return 0;
  81 }
  82
  83 static void flush_old_commits(struct work_struct *work)
  84 {
  85         struct reiserfs_sb_info *sbi;
  86         struct super_block *s;
  87
  88         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  89         s = sbi->s_journal->j_work_sb;
  90
  91         spin_lock(&sbi->old_work_lock);
  92         sbi->work_queued = 0;
  93         spin_unlock(&sbi->old_work_lock);
  94
  95         reiserfs_sync_fs(s, 1);
  96 }
  97
  98 void reiserfs_schedule_old_flush(struct super_block *s)
  99 {
 100         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 101         unsigned long delay;
 102
 103         /*
 104          * Avoid scheduling flush when sb is being shut down. It can race
 105          * with journal shutdown and free still queued delayed work.
 106          */
 107         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 108                 return;
 109
 110         spin_lock(&sbi->old_work_lock);
 111         if (!sbi->work_queued) {
 112                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 113                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 114                 sbi->work_queued = 1;
 115         }
 116         spin_unlock(&sbi->old_work_lock);
 117 }
 118
 119 static void cancel_old_flush(struct super_block *s)
 120 {
 121         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 122
 123         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 124         spin_lock(&sbi->old_work_lock);
 125         sbi->work_queued = 0;
 126         spin_unlock(&sbi->old_work_lock);
 127 }
 128
 129 static int reiserfs_freeze(struct super_block *s)
 130 {
 131         struct reiserfs_transaction_handle th;
 132
 133         cancel_old_flush(s);
 134
 135         reiserfs_write_lock(s);
 136         if (!(s->s_flags & MS_RDONLY)) {
 137                 int err = journal_begin(&th, s, 1);
 138                 if (err) {
 139                         reiserfs_block_writes(&th);
 140                 } else {
 141                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 142                                                      1);
 143                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 144                         reiserfs_block_writes(&th);
 145                         journal_end_sync(&th);
 146                 }
 147         }
 148         reiserfs_write_unlock(s);
 149         return 0;
 150 }
 151
 152 static int reiserfs_unfreeze(struct super_block *s)
 153 {
 154         reiserfs_allow_writes(s);
 155         return 0;
 156 }
 157
 158 extern const struct in_core_key MAX_IN_CORE_KEY;
 159
 160 /*
 161  * this is used to delete "save link" when there are no items of a
 162  * file it points to. It can either happen if unlink is completed but
 163  * "save unlink" removal, or if file has both unlink and truncate
 164  * pending and as unlink completes first (because key of "save link"
 165  * protecting unlink is bigger that a key lf "save link" which
 166  * protects truncate), so there left no items to make truncate
 167  * completion on
 168  */
 169 static int remove_save_link_only(struct super_block *s,
 170                                  struct reiserfs_key *key, int oid_free)
 171 {
 172         struct reiserfs_transaction_handle th;
 173         int err;
 174
 175         /* we are going to do one balancing */
 176         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 177         if (err)
 178                 return err;
 179
 180         reiserfs_delete_solid_item(&th, NULL, key);
 181         if (oid_free)
 182                 /* removals are protected by direct items */
 183                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 184
 185         return journal_end(&th);
 186 }
 187
 188 #ifdef CONFIG_QUOTA
 189 static int reiserfs_quota_on_mount(struct super_block *, int);
 190 #endif
 191
 192 /* look for uncompleted unlinks and truncates and complete them */
 193 static int finish_unfinished(struct super_block *s)
 194 {
 195         INITIALIZE_PATH(path);
 196         struct cpu_key max_cpu_key, obj_key;
 197         struct reiserfs_key save_link_key, last_inode_key;
 198         int retval = 0;
 199         struct item_head *ih;
 200         struct buffer_head *bh;
 201         int item_pos;
 202         char *item;
 203         int done;
 204         struct inode *inode;
 205         int truncate;
 206 #ifdef CONFIG_QUOTA
 207         int i;
 208         int ms_active_set;
 209         int quota_enabled[MAXQUOTAS];
 210 #endif
 211
 212         /* compose key to look for "save" links */
 213         max_cpu_key.version = KEY_FORMAT_3_5;
 214         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 215         max_cpu_key.on_disk_key.k_objectid = ~0U;
 216         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 217         max_cpu_key.key_length = 3;
 218
 219         memset(&last_inode_key, 0, sizeof(last_inode_key));
 220
 221 #ifdef CONFIG_QUOTA
 222         /* Needed for iput() to work correctly and not trash data */
 223         if (s->s_flags & MS_ACTIVE) {
 224                 ms_active_set = 0;
 225         } else {
 226                 ms_active_set = 1;
 227                 s->s_flags |= MS_ACTIVE;
 228         }
 229         /* Turn on quotas so that they are updated correctly */
 230         for (i = 0; i < MAXQUOTAS; i++) {
 231                 quota_enabled[i] = 1;
 232                 if (REISERFS_SB(s)->s_qf_names[i]) {
 233                         int ret;
 234
 235                         if (sb_has_quota_active(s, i)) {
 236                                 quota_enabled[i] = 0;
 237                                 continue;
 238                         }
 239                         ret = reiserfs_quota_on_mount(s, i);
 240                         if (ret < 0)
 241                                 reiserfs_warning(s, "reiserfs-2500",
 242                                                  "cannot turn on journaled "
 243                                                  "quota: error %d", ret);
 244                 }
 245         }
 246 #endif
 247
 248         done = 0;
 249         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 250         while (!retval) {
 251                 int depth;
 252                 retval = search_item(s, &max_cpu_key, &path);
 253                 if (retval != ITEM_NOT_FOUND) {
 254                         reiserfs_error(s, "vs-2140",
 255                                        "search_by_key returned %d", retval);
 256                         break;
 257                 }
 258
 259                 bh = get_last_bh(&path);
 260                 item_pos = get_item_pos(&path);
 261                 if (item_pos != B_NR_ITEMS(bh)) {
 262                         reiserfs_warning(s, "vs-2060",
 263                                          "wrong position found");
 264                         break;
 265                 }
 266                 item_pos--;
 267                 ih = item_head(bh, item_pos);
 268
 269                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 270                         /* there are no "save" links anymore */
 271                         break;
 272
 273                 save_link_key = ih->ih_key;
 274                 if (is_indirect_le_ih(ih))
 275                         truncate = 1;
 276                 else
 277                         truncate = 0;
 278
 279                 /* reiserfs_iget needs k_dirid and k_objectid only */
 280                 item = ih_item_body(bh, ih);
 281                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 282                 obj_key.on_disk_key.k_objectid =
 283                     le32_to_cpu(ih->ih_key.k_objectid);
 284                 obj_key.on_disk_key.k_offset = 0;
 285                 obj_key.on_disk_key.k_type = 0;
 286
 287                 pathrelse(&path);
 288
 289                 inode = reiserfs_iget(s, &obj_key);
 290                 if (!inode) {
 291                         /*
 292                          * the unlink almost completed, it just did not
 293                          * manage to remove "save" link and release objectid
 294                          */
 295                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 296                                          &obj_key);
 297                         retval = remove_save_link_only(s, &save_link_key, 1);
 298                         continue;
 299                 }
 300
 301                 if (!truncate && inode->i_nlink) {
 302                         /* file is not unlinked */
 303                         reiserfs_warning(s, "vs-2185",
 304                                          "file %K is not unlinked",
 305                                          &obj_key);
 306                         retval = remove_save_link_only(s, &save_link_key, 0);
 307                         continue;
 308                 }
 309                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 310                 dquot_initialize(inode);
 311                 reiserfs_write_lock_nested(inode->i_sb, depth);
 312
 313                 if (truncate && S_ISDIR(inode->i_mode)) {
 314                         /*
 315                          * We got a truncate request for a dir which
 316                          * is impossible.  The only imaginable way is to
 317                          * execute unfinished truncate request then boot
 318                          * into old kernel, remove the file and create dir
 319                          * with the same key.
 320                          */
 321                         reiserfs_warning(s, "green-2101",
 322                                          "impossible truncate on a "
 323                                          "directory %k. Please report",
 324                                          INODE_PKEY(inode));
 325                         retval = remove_save_link_only(s, &save_link_key, 0);
 326                         truncate = 0;
 327                         iput(inode);
 328                         continue;
 329                 }
 330
 331                 if (truncate) {
 332                         REISERFS_I(inode)->i_flags |=
 333                             i_link_saved_truncate_mask;
 334                         /*
 335                          * not completed truncate found. New size was
 336                          * committed together with "save" link
 337                          */
 338                         reiserfs_info(s, "Truncating %k to %lld ..",
 339                                       INODE_PKEY(inode), inode->i_size);
 340
 341                         /* don't update modification time */
 342                         reiserfs_truncate_file(inode, 0);
 343
 344                         retval = remove_save_link(inode, truncate);
 345                 } else {
 346                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 347                         /* not completed unlink (rmdir) found */
 348                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 349                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 350                                         sizeof(last_inode_key))){
 351                                 last_inode_key = *INODE_PKEY(inode);
 352                                 /* removal gets completed in iput */
 353                                 retval = 0;
 354                         } else {
 355                                 reiserfs_warning(s, "super-2189", "Dead loop "
 356                                                  "in finish_unfinished "
 357                                                  "detected, just remove "
 358                                                  "save link\n");
 359                                 retval = remove_save_link_only(s,
 360                                                         &save_link_key, 0);
 361                         }
 362                 }
 363
 364                 iput(inode);
 365                 printk("done\n");
 366                 done++;
 367         }
 368         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 369
 370 #ifdef CONFIG_QUOTA
 371         /* Turn quotas off */
 372         reiserfs_write_unlock(s);
 373         for (i = 0; i < MAXQUOTAS; i++) {
 374                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 375                         dquot_quota_off(s, i);
 376         }
 377         reiserfs_write_lock(s);
 378         if (ms_active_set)
 379                 /* Restore the flag back */
 380                 s->s_flags &= ~MS_ACTIVE;
 381 #endif
 382         pathrelse(&path);
 383         if (done)
 384                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 385                               "Completed\n", done);
 386         return retval;
 387 }
 388
 389 /*
 390  * to protect file being unlinked from getting lost we "safe" link files
 391  * being unlinked. This link will be deleted in the same transaction with last
 392  * item of file. mounting the filesystem we scan all these links and remove
 393  * files which almost got lost
 394  */
 395 void add_save_link(struct reiserfs_transaction_handle *th,
 396                    struct inode *inode, int truncate)
 397 {
 398         INITIALIZE_PATH(path);
 399         int retval;
 400         struct cpu_key key;
 401         struct item_head ih;
 402         __le32 link;
 403
 404         BUG_ON(!th->t_trans_id);
 405
 406         /* file can only get one "save link" of each kind */
 407         RFALSE(truncate &&
 408                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 409                "saved link already exists for truncated inode %lx",
 410                (long)inode->i_ino);
 411         RFALSE(!truncate &&
 412                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 413                "saved link already exists for unlinked inode %lx",
 414                (long)inode->i_ino);
 415
 416         /* setup key of "save" link */
 417         key.version = KEY_FORMAT_3_5;
 418         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 419         key.on_disk_key.k_objectid = inode->i_ino;
 420         if (!truncate) {
 421                 /* unlink, rmdir, rename */
 422                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 423                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 424
 425                 /* item head of "safe" link */
 426                 make_le_item_head(&ih, &key, key.version,
 427                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 428                                   4 /*length */ , 0xffff /*free space */ );
 429         } else {
 430                 /* truncate */
 431                 if (S_ISDIR(inode->i_mode))
 432                         reiserfs_warning(inode->i_sb, "green-2102",
 433                                          "Adding a truncate savelink for "
 434                                          "a directory %k! Please report",
 435                                          INODE_PKEY(inode));
 436                 set_cpu_key_k_offset(&key, 1);
 437                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 438
 439                 /* item head of "safe" link */
 440                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 441                                   4 /*length */ , 0 /*free space */ );
 442         }
 443         key.key_length = 3;
 444
 445         /* look for its place in the tree */
 446         retval = search_item(inode->i_sb, &key, &path);
 447         if (retval != ITEM_NOT_FOUND) {
 448                 if (retval != -ENOSPC)
 449                         reiserfs_error(inode->i_sb, "vs-2100",
 450                                        "search_by_key (%K) returned %d", &key,
 451                                        retval);
 452                 pathrelse(&path);
 453                 return;
 454         }
 455
 456         /* body of "save" link */
 457         link = INODE_PKEY(inode)->k_dir_id;
 458
 459         /* put "save" link into tree, don't charge quota to anyone */
 460         retval =
 461             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 462         if (retval) {
 463                 if (retval != -ENOSPC)
 464                         reiserfs_error(inode->i_sb, "vs-2120",
 465                                        "insert_item returned %d", retval);
 466         } else {
 467                 if (truncate)
 468                         REISERFS_I(inode)->i_flags |=
 469                             i_link_saved_truncate_mask;
 470                 else
 471                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 472         }
 473 }
 474
 475 /* this opens transaction unlike add_save_link */
 476 int remove_save_link(struct inode *inode, int truncate)
 477 {
 478         struct reiserfs_transaction_handle th;
 479         struct reiserfs_key key;
 480         int err;
 481
 482         /* we are going to do one balancing only */
 483         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 484         if (err)
 485                 return err;
 486
 487         /* setup key of "save" link */
 488         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 489         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 490         if (!truncate) {
 491                 /* unlink, rmdir, rename */
 492                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 493                                     1 + inode->i_sb->s_blocksize);
 494                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 495         } else {
 496                 /* truncate */
 497                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 498                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 499         }
 500
 501         if ((truncate &&
 502              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 503             (!truncate &&
 504              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 505                 /* don't take quota bytes from anywhere */
 506                 reiserfs_delete_solid_item(&th, NULL, &key);
 507         if (!truncate) {
 508                 reiserfs_release_objectid(&th, inode->i_ino);
 509                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 510         } else
 511                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 512
 513         return journal_end(&th);
 514 }
 515
 516 static void reiserfs_kill_sb(struct super_block *s)
 517 {
 518         if (REISERFS_SB(s)) {
 519                 reiserfs_proc_info_done(s);
 520                 /*
 521                  * Force any pending inode evictions to occur now. Any
 522                  * inodes to be removed that have extended attributes
 523                  * associated with them need to clean them up before
 524                  * we can release the extended attribute root dentries.
 525                  * shrink_dcache_for_umount will BUG if we don't release
 526                  * those before it's called so ->put_super is too late.
 527                  */
 528                 shrink_dcache_sb(s);
 529
 530                 dput(REISERFS_SB(s)->xattr_root);
 531                 REISERFS_SB(s)->xattr_root = NULL;
 532                 dput(REISERFS_SB(s)->priv_root);
 533                 REISERFS_SB(s)->priv_root = NULL;
 534         }
 535
 536         kill_block_super(s);
 537 }
 538
 539 static void reiserfs_put_super(struct super_block *s)
 540 {
 541         struct reiserfs_transaction_handle th;
 542         th.t_trans_id = 0;
 543
 544         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 545
 546         reiserfs_write_lock(s);
 547
 548         /*
 549          * change file system state to current state if it was mounted
 550          * with read-write permissions
 551          */
 552         if (!(s->s_flags & MS_RDONLY)) {
 553                 if (!journal_begin(&th, s, 10)) {
 554                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 555                                                      1);
 556                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 557                                             REISERFS_SB(s)->s_mount_state);
 558                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 559                 }
 560         }
 561
 562         /*
 563          * note, journal_release checks for readonly mount, and can
 564          * decide not to do a journal_end
 565          */
 566         journal_release(&th, s);
 567
 568         reiserfs_free_bitmap_cache(s);
 569
 570         brelse(SB_BUFFER_WITH_SB(s));
 571
 572         print_statistics(s);
 573
 574         if (REISERFS_SB(s)->reserved_blocks != 0) {
 575                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 576                                  REISERFS_SB(s)->reserved_blocks);
 577         }
 578
 579         reiserfs_write_unlock(s);
 580         mutex_destroy(&REISERFS_SB(s)->lock);
 581         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 582         kfree(s->s_fs_info);
 583         s->s_fs_info = NULL;
 584 }
 585
 586 static struct kmem_cache *reiserfs_inode_cachep;
 587
 588 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 589 {
 590         struct reiserfs_inode_info *ei;
 591         ei = (struct reiserfs_inode_info *)
 592             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 593         if (!ei)
 594                 return NULL;
 595         atomic_set(&ei->openers, 0);
 596         mutex_init(&ei->tailpack);
 597         return &ei->vfs_inode;
 598 }
 599
 600 static void reiserfs_i_callback(struct rcu_head *head)
 601 {
 602         struct inode *inode = container_of(head, struct inode, i_rcu);
 603         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 604 }
 605
 606 static void reiserfs_destroy_inode(struct inode *inode)
 607 {
 608         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 609 }
 610
 611 static void init_once(void *foo)
 612 {
 613         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 614
 615         INIT_LIST_HEAD(&ei->i_prealloc_list);
 616         inode_init_once(&ei->vfs_inode);
 617 }
 618
 619 static int __init init_inodecache(void)
 620 {
 621         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 622                                                   sizeof(struct
 623                                                          reiserfs_inode_info),
 624                                                   0, (SLAB_RECLAIM_ACCOUNT|
 625                                                         SLAB_MEM_SPREAD),
 626                                                   init_once);
 627         if (reiserfs_inode_cachep == NULL)
 628                 return -ENOMEM;
 629         return 0;
 630 }
 631
 632 static void destroy_inodecache(void)
 633 {
 634         /*
 635          * Make sure all delayed rcu free inodes are flushed before we
 636          * destroy cache.
 637          */
 638         rcu_barrier();
 639         kmem_cache_destroy(reiserfs_inode_cachep);
 640 }
 641
 642 /* we don't mark inodes dirty, we just log them */
 643 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 644 {
 645         struct reiserfs_transaction_handle th;
 646
 647         int err = 0;
 648
 649         if (inode->i_sb->s_flags & MS_RDONLY) {
 650                 reiserfs_warning(inode->i_sb, "clm-6006",
 651                                  "writing inode %lu on readonly FS",
 652                                  inode->i_ino);
 653                 return;
 654         }
 655         reiserfs_write_lock(inode->i_sb);
 656
 657         /*
 658          * this is really only used for atime updates, so they don't have
 659          * to be included in O_SYNC or fsync
 660          */
 661         err = journal_begin(&th, inode->i_sb, 1);
 662         if (err)
 663                 goto out;
 664
 665         reiserfs_update_sd(&th, inode);
 666         journal_end(&th);
 667
 668 out:
 669         reiserfs_write_unlock(inode->i_sb);
 670 }
 671
 672 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 673 {
 674         struct super_block *s = root->d_sb;
 675         struct reiserfs_journal *journal = SB_JOURNAL(s);
 676         long opts = REISERFS_SB(s)->s_mount_opt;
 677
 678         if (opts & (1 << REISERFS_LARGETAIL))
 679                 seq_puts(seq, ",tails=on");
 680         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 681                 seq_puts(seq, ",notail");
 682         /* tails=small is default so we don't show it */
 683
 684         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 685                 seq_puts(seq, ",barrier=none");
 686         /* barrier=flush is default so we don't show it */
 687
 688         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 689                 seq_puts(seq, ",errors=continue");
 690         else if (opts & (1 << REISERFS_ERROR_PANIC))
 691                 seq_puts(seq, ",errors=panic");
 692         /* errors=ro is default so we don't show it */
 693
 694         if (opts & (1 << REISERFS_DATA_LOG))
 695                 seq_puts(seq, ",data=journal");
 696         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 697                 seq_puts(seq, ",data=writeback");
 698         /* data=ordered is default so we don't show it */
 699
 700         if (opts & (1 << REISERFS_ATTRS))
 701                 seq_puts(seq, ",attrs");
 702
 703         if (opts & (1 << REISERFS_XATTRS_USER))
 704                 seq_puts(seq, ",user_xattr");
 705
 706         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 707                 seq_puts(seq, ",expose_privroot");
 708
 709         if (opts & (1 << REISERFS_POSIXACL))
 710                 seq_puts(seq, ",acl");
 711
 712         if (REISERFS_SB(s)->s_jdev)
 713                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 714
 715         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 716                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 717
 718 #ifdef CONFIG_QUOTA
 719         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 720                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 721         else if (opts & (1 << REISERFS_USRQUOTA))
 722                 seq_puts(seq, ",usrquota");
 723         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 724                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 725         else if (opts & (1 << REISERFS_GRPQUOTA))
 726                 seq_puts(seq, ",grpquota");
 727         if (REISERFS_SB(s)->s_jquota_fmt) {
 728                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 729                         seq_puts(seq, ",jqfmt=vfsold");
 730                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 731                         seq_puts(seq, ",jqfmt=vfsv0");
 732         }
 733 #endif
 734
 735         /* Block allocator options */
 736         if (opts & (1 << REISERFS_NO_BORDER))
 737                 seq_puts(seq, ",block-allocator=noborder");
 738         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 739                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 740         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 741                 seq_puts(seq, ",block-allocator=hashed_relocation");
 742         if (opts & (1 << REISERFS_TEST4))
 743                 seq_puts(seq, ",block-allocator=test4");
 744         show_alloc_options(seq, s);
 745         return 0;
 746 }
 747
 748 #ifdef CONFIG_QUOTA
 749 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 750                                     size_t, loff_t);
 751 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 752                                    loff_t);
 753 #endif
 754
 755 static const struct super_operations reiserfs_sops = {
 756         .alloc_inode = reiserfs_alloc_inode,
 757         .destroy_inode = reiserfs_destroy_inode,
 758         .write_inode = reiserfs_write_inode,
 759         .dirty_inode = reiserfs_dirty_inode,
 760         .evict_inode = reiserfs_evict_inode,
 761         .put_super = reiserfs_put_super,
 762         .sync_fs = reiserfs_sync_fs,
 763         .freeze_fs = reiserfs_freeze,
 764         .unfreeze_fs = reiserfs_unfreeze,
 765         .statfs = reiserfs_statfs,
 766         .remount_fs = reiserfs_remount,
 767         .show_options = reiserfs_show_options,
 768 #ifdef CONFIG_QUOTA
 769         .quota_read = reiserfs_quota_read,
 770         .quota_write = reiserfs_quota_write,
 771 #endif
 772 };
 773
 774 #ifdef CONFIG_QUOTA
 775 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 776
 777 static int reiserfs_write_dquot(struct dquot *);
 778 static int reiserfs_acquire_dquot(struct dquot *);
 779 static int reiserfs_release_dquot(struct dquot *);
 780 static int reiserfs_mark_dquot_dirty(struct dquot *);
 781 static int reiserfs_write_info(struct super_block *, int);
 782 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 783
 784 static const struct dquot_operations reiserfs_quota_operations = {
 785         .write_dquot = reiserfs_write_dquot,
 786         .acquire_dquot = reiserfs_acquire_dquot,
 787         .release_dquot = reiserfs_release_dquot,
 788         .mark_dirty = reiserfs_mark_dquot_dirty,
 789         .write_info = reiserfs_write_info,
 790         .alloc_dquot    = dquot_alloc,
 791         .destroy_dquot  = dquot_destroy,
 792 };
 793
 794 static const struct quotactl_ops reiserfs_qctl_operations = {
 795         .quota_on = reiserfs_quota_on,
 796         .quota_off = dquot_quota_off,
 797         .quota_sync = dquot_quota_sync,
 798         .get_info = dquot_get_dqinfo,
 799         .set_info = dquot_set_dqinfo,
 800         .get_dqblk = dquot_get_dqblk,
 801         .set_dqblk = dquot_set_dqblk,
 802 };
 803 #endif
 804
 805 static const struct export_operations reiserfs_export_ops = {
 806         .encode_fh = reiserfs_encode_fh,
 807         .fh_to_dentry = reiserfs_fh_to_dentry,
 808         .fh_to_parent = reiserfs_fh_to_parent,
 809         .get_parent = reiserfs_get_parent,
 810 };
 811
 812 /*
 813  * this struct is used in reiserfs_getopt () for containing the value for
 814  * those mount options that have values rather than being toggles.
 815  */
 816 typedef struct {
 817         char *value;
 818         /*
 819          * bitmask which is to set on mount_options bitmask
 820          * when this value is found, 0 is no bits are to be changed.
 821          */
 822         int setmask;
 823         /*
 824          * bitmask which is to clear on mount_options bitmask
 825          * when this value is found, 0 is no bits are to be changed.
 826          * This is applied BEFORE setmask
 827          */
 828         int clrmask;
 829 } arg_desc_t;
 830
 831 /* Set this bit in arg_required to allow empty arguments */
 832 #define REISERFS_OPT_ALLOWEMPTY 31
 833
 834 /*
 835  * this struct is used in reiserfs_getopt() for describing the
 836  * set of reiserfs mount options
 837  */
 838 typedef struct {
 839         char *option_name;
 840
 841         /* 0 if argument is not required, not 0 otherwise */
 842         int arg_required;
 843
 844         /* list of values accepted by an option */
 845         const arg_desc_t *values;
 846
 847         /*
 848          * bitmask which is to set on mount_options bitmask
 849          * when this value is found, 0 is no bits are to be changed.
 850          */
 851         int setmask;
 852
 853         /*
 854          * bitmask which is to clear on mount_options bitmask
 855          * when this value is found, 0 is no bits are to be changed.
 856          * This is applied BEFORE setmask
 857          */
 858         int clrmask;
 859 } opt_desc_t;
 860
 861 /* possible values for -o data= */
 862 static const arg_desc_t logging_mode[] = {
 863         {"ordered", 1 << REISERFS_DATA_ORDERED,
 864          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 865         {"journal", 1 << REISERFS_DATA_LOG,
 866          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 867         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 868          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 869         {.value = NULL}
 870 };
 871
 872 /* possible values for -o barrier= */
 873 static const arg_desc_t barrier_mode[] = {
 874         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 875         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 876         {.value = NULL}
 877 };
 878
 879 /*
 880  * possible values for "-o block-allocator=" and bits which are to be set in
 881  * s_mount_opt of reiserfs specific part of in-core super block
 882  */
 883 static const arg_desc_t balloc[] = {
 884         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 885         {"border", 0, 1 << REISERFS_NO_BORDER},
 886         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 887         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 888         {"test4", 1 << REISERFS_TEST4, 0},
 889         {"notest4", 0, 1 << REISERFS_TEST4},
 890         {NULL, 0, 0}
 891 };
 892
 893 static const arg_desc_t tails[] = {
 894         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 895         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 896         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 897         {NULL, 0, 0}
 898 };
 899
 900 static const arg_desc_t error_actions[] = {
 901         {"panic", 1 << REISERFS_ERROR_PANIC,
 902          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 903         {"ro-remount", 1 << REISERFS_ERROR_RO,
 904          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 905 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 906         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 907          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 908 #endif
 909         {NULL, 0, 0},
 910 };
 911
 912 /*
 913  * proceed only one option from a list *cur - string containing of mount
 914  * options
 915  * opts - array of options which are accepted
 916  * opt_arg - if option is found and requires an argument and if it is specifed
 917  * in the input - pointer to the argument is stored here
 918  * bit_flags - if option requires to set a certain bit - it is set here
 919  * return -1 if unknown option is found, opt->arg_required otherwise
 920  */
 921 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 922                            char **opt_arg, unsigned long *bit_flags)
 923 {
 924         char *p;
 925         /*
 926          * foo=bar,
 927          * ^   ^  ^
 928          * |   |  +-- option_end
 929          * |   +-- arg_start
 930          * +-- option_start
 931          */
 932         const opt_desc_t *opt;
 933         const arg_desc_t *arg;
 934
 935         p = *cur;
 936
 937         /* assume argument cannot contain commas */
 938         *cur = strchr(p, ',');
 939         if (*cur) {
 940                 *(*cur) = '\0';
 941                 (*cur)++;
 942         }
 943
 944         if (!strncmp(p, "alloc=", 6)) {
 945                 /*
 946                  * Ugly special case, probably we should redo options
 947                  * parser so that it can understand several arguments for
 948                  * some options, also so that it can fill several bitfields
 949                  * with option values.
 950                  */
 951                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 952                         return -1;
 953                 } else {
 954                         return 0;
 955                 }
 956         }
 957
 958         /* for every option in the list */
 959         for (opt = opts; opt->option_name; opt++) {
 960                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 961                         if (bit_flags) {
 962                                 if (opt->clrmask ==
 963                                     (1 << REISERFS_UNSUPPORTED_OPT))
 964                                         reiserfs_warning(s, "super-6500",
 965                                                          "%s not supported.\n",
 966                                                          p);
 967                                 else
 968                                         *bit_flags &= ~opt->clrmask;
 969                                 if (opt->setmask ==
 970                                     (1 << REISERFS_UNSUPPORTED_OPT))
 971                                         reiserfs_warning(s, "super-6501",
 972                                                          "%s not supported.\n",
 973                                                          p);
 974                                 else
 975                                         *bit_flags |= opt->setmask;
 976                         }
 977                         break;
 978                 }
 979         }
 980         if (!opt->option_name) {
 981                 reiserfs_warning(s, "super-6502",
 982                                  "unknown mount option \"%s\"", p);
 983                 return -1;
 984         }
 985
 986         p += strlen(opt->option_name);
 987         switch (*p) {
 988         case '=':
 989                 if (!opt->arg_required) {
 990                         reiserfs_warning(s, "super-6503",
 991                                          "the option \"%s\" does not "
 992                                          "require an argument\n",
 993                                          opt->option_name);
 994                         return -1;
 995                 }
 996                 break;
 997
 998         case 0:
 999                 if (opt->arg_required) {
1000                         reiserfs_warning(s, "super-6504",
1001                                          "the option \"%s\" requires an "
1002                                          "argument\n", opt->option_name);
1003                         return -1;
1004                 }
1005                 break;
1006         default:
1007                 reiserfs_warning(s, "super-6505",
1008                                  "head of option \"%s\" is only correct\n",
1009                                  opt->option_name);
1010                 return -1;
1011         }
1012
1013         /*
1014          * move to the argument, or to next option if argument is not
1015          * required
1016          */
1017         p++;
1018
1019         if (opt->arg_required
1020             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1021             && !strlen(p)) {
1022                 /* this catches "option=," if not allowed */
1023                 reiserfs_warning(s, "super-6506",
1024                                  "empty argument for \"%s\"\n",
1025                                  opt->option_name);
1026                 return -1;
1027         }
1028
1029         if (!opt->values) {
1030                 /* *=NULLopt_arg contains pointer to argument */
1031                 *opt_arg = p;
1032                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1033         }
1034
1035         /* values possible for this option are listed in opt->values */
1036         for (arg = opt->values; arg->value; arg++) {
1037                 if (!strcmp(p, arg->value)) {
1038                         if (bit_flags) {
1039                                 *bit_flags &= ~arg->clrmask;
1040                                 *bit_flags |= arg->setmask;
1041                         }
1042                         return opt->arg_required;
1043                 }
1044         }
1045
1046         reiserfs_warning(s, "super-6506",
1047                          "bad value \"%s\" for option \"%s\"\n", p,
1048                          opt->option_name);
1049         return -1;
1050 }
1051
1052 /* returns 0 if something is wrong in option string, 1 - otherwise */
1053 static int reiserfs_parse_options(struct super_block *s,
1054
1055                                   /* string given via mount's -o */
1056                                   char *options,
1057
1058                                   /*
1059                                    * after the parsing phase, contains the
1060                                    * collection of bitflags defining what
1061                                    * mount options were selected.
1062                                    */
1063                                   unsigned long *mount_options,
1064
1065                                   /* strtol-ed from NNN of resize=NNN */
1066                                   unsigned long *blocks,
1067                                   char **jdev_name,
1068                                   unsigned int *commit_max_age,
1069                                   char **qf_names,
1070                                   unsigned int *qfmt)
1071 {
1072         int c;
1073         char *arg = NULL;
1074         char *pos;
1075         opt_desc_t opts[] = {
1076                 /*
1077                  * Compatibility stuff, so that -o notail for old
1078                  * setups still work
1079                  */
1080                 {"tails",.arg_required = 't',.values = tails},
1081                 {"notail",.clrmask =
1082                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1083                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1084                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1085                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1086                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1087 #ifdef CONFIG_REISERFS_FS_XATTR
1088                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1089                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1090 #else
1091                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1092                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1093 #endif
1094 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1095                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1096                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1097 #else
1098                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1099                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1100 #endif
1101                 {.option_name = "nolog"},
1102                 {"replayonly",.setmask = 1 << REPLAYONLY},
1103                 {"block-allocator",.arg_required = 'a',.values = balloc},
1104                 {"data",.arg_required = 'd',.values = logging_mode},
1105                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1106                 {"resize",.arg_required = 'r',.values = NULL},
1107                 {"jdev",.arg_required = 'j',.values = NULL},
1108                 {"nolargeio",.arg_required = 'w',.values = NULL},
1109                 {"commit",.arg_required = 'c',.values = NULL},
1110                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1111                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1112                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1113                 {"errors",.arg_required = 'e',.values = error_actions},
1114                 {"usrjquota",.arg_required =
1115                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1116                 {"grpjquota",.arg_required =
1117                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1118                 {"jqfmt",.arg_required = 'f',.values = NULL},
1119                 {.option_name = NULL}
1120         };
1121
1122         *blocks = 0;
1123         if (!options || !*options)
1124                 /*
1125                  * use default configuration: create tails, journaling on, no
1126                  * conversion to newest format
1127                  */
1128                 return 1;
1129
1130         for (pos = options; pos;) {
1131                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1132                 if (c == -1)
1133                         /* wrong option is given */
1134                         return 0;
1135
1136                 if (c == 'r') {
1137                         char *p;
1138
1139                         p = NULL;
1140                         /* "resize=NNN" or "resize=auto" */
1141
1142                         if (!strcmp(arg, "auto")) {
1143                                 /* From JFS code, to auto-get the size. */
1144                                 *blocks =
1145                                     s->s_bdev->bd_inode->i_size >> s->
1146                                     s_blocksize_bits;
1147                         } else {
1148                                 *blocks = simple_strtoul(arg, &p, 0);
1149                                 if (*p != '\0') {
1150                                         /* NNN does not look like a number */
1151                                         reiserfs_warning(s, "super-6507",
1152                                                          "bad value %s for "
1153                                                          "-oresize\n", arg);
1154                                         return 0;
1155                                 }
1156                         }
1157                 }
1158
1159                 if (c == 'c') {
1160                         char *p = NULL;
1161                         unsigned long val = simple_strtoul(arg, &p, 0);
1162                         /* commit=NNN (time in seconds) */
1163                         if (*p != '\0' || val >= (unsigned int)-1) {
1164                                 reiserfs_warning(s, "super-6508",
1165                                                  "bad value %s for -ocommit\n",
1166                                                  arg);
1167                                 return 0;
1168                         }
1169                         *commit_max_age = (unsigned int)val;
1170                 }
1171
1172                 if (c == 'w') {
1173                         reiserfs_warning(s, "super-6509", "nolargeio option "
1174                                          "is no longer supported");
1175                         return 0;
1176                 }
1177
1178                 if (c == 'j') {
1179                         if (arg && *arg && jdev_name) {
1180                                 /* Hm, already assigned? */
1181                                 if (*jdev_name) {
1182                                         reiserfs_warning(s, "super-6510",
1183                                                          "journal device was "
1184                                                          "already specified to "
1185                                                          "be %s", *jdev_name);
1186                                         return 0;
1187                                 }
1188                                 *jdev_name = arg;
1189                         }
1190                 }
1191 #ifdef CONFIG_QUOTA
1192                 if (c == 'u' || c == 'g') {
1193                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1194
1195                         if (sb_any_quota_loaded(s) &&
1196                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1197                                 reiserfs_warning(s, "super-6511",
1198                                                  "cannot change journaled "
1199                                                  "quota options when quota "
1200                                                  "turned on.");
1201                                 return 0;
1202                         }
1203                         if (*arg) {     /* Some filename specified? */
1204                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1205                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1206                                               arg)) {
1207                                         reiserfs_warning(s, "super-6512",
1208                                                          "%s quota file "
1209                                                          "already specified.",
1210                                                          QTYPE2NAME(qtype));
1211                                         return 0;
1212                                 }
1213                                 if (strchr(arg, '/')) {
1214                                         reiserfs_warning(s, "super-6513",
1215                                                          "quotafile must be "
1216                                                          "on filesystem root.");
1217                                         return 0;
1218                                 }
1219                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1220                                 if (!qf_names[qtype]) {
1221                                         reiserfs_warning(s, "reiserfs-2502",
1222                                                          "not enough memory "
1223                                                          "for storing "
1224                                                          "quotafile name.");
1225                                         return 0;
1226                                 }
1227                                 if (qtype == USRQUOTA)
1228                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1229                                 else
1230                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1231                         } else {
1232                                 if (qf_names[qtype] !=
1233                                     REISERFS_SB(s)->s_qf_names[qtype])
1234                                         kfree(qf_names[qtype]);
1235                                 qf_names[qtype] = NULL;
1236                                 if (qtype == USRQUOTA)
1237                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1238                                 else
1239                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1240                         }
1241                 }
1242                 if (c == 'f') {
1243                         if (!strcmp(arg, "vfsold"))
1244                                 *qfmt = QFMT_VFS_OLD;
1245                         else if (!strcmp(arg, "vfsv0"))
1246                                 *qfmt = QFMT_VFS_V0;
1247                         else {
1248                                 reiserfs_warning(s, "super-6514",
1249                                                  "unknown quota format "
1250                                                  "specified.");
1251                                 return 0;
1252                         }
1253                         if (sb_any_quota_loaded(s) &&
1254                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1255                                 reiserfs_warning(s, "super-6515",
1256                                                  "cannot change journaled "
1257                                                  "quota options when quota "
1258                                                  "turned on.");
1259                                 return 0;
1260                         }
1261                 }
1262 #else
1263                 if (c == 'u' || c == 'g' || c == 'f') {
1264                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1265                                          "quota options not supported.");
1266                         return 0;
1267                 }
1268 #endif
1269         }
1270
1271 #ifdef CONFIG_QUOTA
1272         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1273             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1274                 reiserfs_warning(s, "super-6515",
1275                                  "journaled quota format not specified.");
1276                 return 0;
1277         }
1278         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1279                sb_has_quota_loaded(s, USRQUOTA)) ||
1280             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1281                sb_has_quota_loaded(s, GRPQUOTA))) {
1282                 reiserfs_warning(s, "super-6516", "quota options must "
1283                                  "be present when quota is turned on.");
1284                 return 0;
1285         }
1286 #endif
1287
1288         return 1;
1289 }
1290
1291 static void switch_data_mode(struct super_block *s, unsigned long mode)
1292 {
1293         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1294                                          (1 << REISERFS_DATA_ORDERED) |
1295                                          (1 << REISERFS_DATA_WRITEBACK));
1296         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1297 }
1298
1299 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1300 {
1301         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1302                 if (!reiserfs_data_log(s)) {
1303                         switch_data_mode(s, REISERFS_DATA_LOG);
1304                         reiserfs_info(s, "switching to journaled data mode\n");
1305                 }
1306         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1307                 if (!reiserfs_data_ordered(s)) {
1308                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1309                         reiserfs_info(s, "switching to ordered data mode\n");
1310                 }
1311         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1312                 if (!reiserfs_data_writeback(s)) {
1313                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1314                         reiserfs_info(s, "switching to writeback data mode\n");
1315                 }
1316         }
1317 }
1318
1319 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1320 {
1321         int flush = (1 << REISERFS_BARRIER_FLUSH);
1322         int none = (1 << REISERFS_BARRIER_NONE);
1323         int all_barrier = flush | none;
1324
1325         if (bits & all_barrier) {
1326                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1327                 if (bits & flush) {
1328                         REISERFS_SB(s)->s_mount_opt |= flush;
1329                         printk("reiserfs: enabling write barrier flush mode\n");
1330                 } else if (bits & none) {
1331                         REISERFS_SB(s)->s_mount_opt |= none;
1332                         printk("reiserfs: write barriers turned off\n");
1333                 }
1334         }
1335 }
1336
1337 static void handle_attrs(struct super_block *s)
1338 {
1339         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1340
1341         if (reiserfs_attrs(s)) {
1342                 if (old_format_only(s)) {
1343                         reiserfs_warning(s, "super-6517", "cannot support "
1344                                          "attributes on 3.5.x disk format");
1345                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1346                         return;
1347                 }
1348                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1349                         reiserfs_warning(s, "super-6518", "cannot support "
1350                                          "attributes until flag is set in "
1351                                          "super-block");
1352                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1353                 }
1354         }
1355 }
1356
1357 #ifdef CONFIG_QUOTA
1358 static void handle_quota_files(struct super_block *s, char **qf_names,
1359                                unsigned int *qfmt)
1360 {
1361         int i;
1362
1363         for (i = 0; i < MAXQUOTAS; i++) {
1364                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1365                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1366                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1367         }
1368         if (*qfmt)
1369                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1370 }
1371 #endif
1372
1373 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1374 {
1375         struct reiserfs_super_block *rs;
1376         struct reiserfs_transaction_handle th;
1377         unsigned long blocks;
1378         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1379         unsigned long safe_mask = 0;
1380         unsigned int commit_max_age = (unsigned int)-1;
1381         struct reiserfs_journal *journal = SB_JOURNAL(s);
1382         char *new_opts = kstrdup(arg, GFP_KERNEL);
1383         int err;
1384         char *qf_names[MAXQUOTAS];
1385         unsigned int qfmt = 0;
1386 #ifdef CONFIG_QUOTA
1387         int i;
1388 #endif
1389
1390         sync_filesystem(s);
1391         reiserfs_write_lock(s);
1392
1393 #ifdef CONFIG_QUOTA
1394         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1395 #endif
1396
1397         rs = SB_DISK_SUPER_BLOCK(s);
1398
1399         if (!reiserfs_parse_options
1400             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1401             qf_names, &qfmt)) {
1402 #ifdef CONFIG_QUOTA
1403                 for (i = 0; i < MAXQUOTAS; i++)
1404                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1405                                 kfree(qf_names[i]);
1406 #endif
1407                 err = -EINVAL;
1408                 goto out_err_unlock;
1409         }
1410 #ifdef CONFIG_QUOTA
1411         handle_quota_files(s, qf_names, &qfmt);
1412 #endif
1413
1414         handle_attrs(s);
1415
1416         /* Add options that are safe here */
1417         safe_mask |= 1 << REISERFS_SMALLTAIL;
1418         safe_mask |= 1 << REISERFS_LARGETAIL;
1419         safe_mask |= 1 << REISERFS_NO_BORDER;
1420         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1421         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1422         safe_mask |= 1 << REISERFS_TEST4;
1423         safe_mask |= 1 << REISERFS_ATTRS;
1424         safe_mask |= 1 << REISERFS_XATTRS_USER;
1425         safe_mask |= 1 << REISERFS_POSIXACL;
1426         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1427         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1428         safe_mask |= 1 << REISERFS_ERROR_RO;
1429         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1430         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1431         safe_mask |= 1 << REISERFS_USRQUOTA;
1432         safe_mask |= 1 << REISERFS_GRPQUOTA;
1433
1434         /*
1435          * Update the bitmask, taking care to keep
1436          * the bits we're not allowed to change here
1437          */
1438         REISERFS_SB(s)->s_mount_opt =
1439             (REISERFS_SB(s)->
1440              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1441
1442         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1443                 journal->j_max_commit_age = commit_max_age;
1444                 journal->j_max_trans_age = commit_max_age;
1445         } else if (commit_max_age == 0) {
1446                 /* 0 means restore defaults. */
1447                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1448                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1449         }
1450
1451         if (blocks) {
1452                 err = reiserfs_resize(s, blocks);
1453                 if (err != 0)
1454                         goto out_err_unlock;
1455         }
1456
1457         if (*mount_flags & MS_RDONLY) {
1458                 reiserfs_write_unlock(s);
1459                 reiserfs_xattr_init(s, *mount_flags);
1460                 /* remount read-only */
1461                 if (s->s_flags & MS_RDONLY)
1462                         /* it is read-only already */
1463                         goto out_ok_unlocked;
1464
1465                 err = dquot_suspend(s, -1);
1466                 if (err < 0)
1467                         goto out_err;
1468
1469                 /* try to remount file system with read-only permissions */
1470                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1471                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1472                         goto out_ok_unlocked;
1473                 }
1474
1475                 reiserfs_write_lock(s);
1476
1477                 err = journal_begin(&th, s, 10);
1478                 if (err)
1479                         goto out_err_unlock;
1480
1481                 /* Mounting a rw partition read-only. */
1482                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1483                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1484                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1485         } else {
1486                 /* remount read-write */
1487                 if (!(s->s_flags & MS_RDONLY)) {
1488                         reiserfs_write_unlock(s);
1489                         reiserfs_xattr_init(s, *mount_flags);
1490                         goto out_ok_unlocked;   /* We are read-write already */
1491                 }
1492
1493                 if (reiserfs_is_journal_aborted(journal)) {
1494                         err = journal->j_errno;
1495                         goto out_err_unlock;
1496                 }
1497
1498                 handle_data_mode(s, mount_options);
1499                 handle_barrier_mode(s, mount_options);
1500                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1501
1502                 /* now it is safe to call journal_begin */
1503                 s->s_flags &= ~MS_RDONLY;
1504                 err = journal_begin(&th, s, 10);
1505                 if (err)
1506                         goto out_err_unlock;
1507
1508                 /* Mount a partition which is read-only, read-write */
1509                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1510                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1511                 s->s_flags &= ~MS_RDONLY;
1512                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1513                 if (!old_format_only(s))
1514                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1515                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1516                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1517                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1518         }
1519         /* this will force a full flush of all journal lists */
1520         SB_JOURNAL(s)->j_must_wait = 1;
1521         err = journal_end(&th);
1522         if (err)
1523                 goto out_err_unlock;
1524
1525         reiserfs_write_unlock(s);
1526         if (!(*mount_flags & MS_RDONLY)) {
1527                 dquot_resume(s, -1);
1528                 reiserfs_write_lock(s);
1529                 finish_unfinished(s);
1530                 reiserfs_write_unlock(s);
1531                 reiserfs_xattr_init(s, *mount_flags);
1532         }
1533
1534 out_ok_unlocked:
1535         replace_mount_options(s, new_opts);
1536         return 0;
1537
1538 out_err_unlock:
1539         reiserfs_write_unlock(s);
1540 out_err:
1541         kfree(new_opts);
1542         return err;
1543 }
1544
1545 static int read_super_block(struct super_block *s, int offset)
1546 {
1547         struct buffer_head *bh;
1548         struct reiserfs_super_block *rs;
1549         int fs_blocksize;
1550
1551         bh = sb_bread(s, offset / s->s_blocksize);
1552         if (!bh) {
1553                 reiserfs_warning(s, "sh-2006",
1554                                  "bread failed (dev %s, block %lu, size %lu)",
1555                                  s->s_id, offset / s->s_blocksize,
1556                                  s->s_blocksize);
1557                 return 1;
1558         }
1559
1560         rs = (struct reiserfs_super_block *)bh->b_data;
1561         if (!is_any_reiserfs_magic_string(rs)) {
1562                 brelse(bh);
1563                 return 1;
1564         }
1565         /*
1566          * ok, reiserfs signature (old or new) found in at the given offset
1567          */
1568         fs_blocksize = sb_blocksize(rs);
1569         brelse(bh);
1570         sb_set_blocksize(s, fs_blocksize);
1571
1572         bh = sb_bread(s, offset / s->s_blocksize);
1573         if (!bh) {
1574                 reiserfs_warning(s, "sh-2007",
1575                                  "bread failed (dev %s, block %lu, size %lu)",
1576                                  s->s_id, offset / s->s_blocksize,
1577                                  s->s_blocksize);
1578                 return 1;
1579         }
1580
1581         rs = (struct reiserfs_super_block *)bh->b_data;
1582         if (sb_blocksize(rs) != s->s_blocksize) {
1583                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1584                                  "filesystem on (dev %s, block %llu, size %lu)",
1585                                  s->s_id,
1586                                  (unsigned long long)bh->b_blocknr,
1587                                  s->s_blocksize);
1588                 brelse(bh);
1589                 return 1;
1590         }
1591
1592         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1593                 brelse(bh);
1594                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1595                                  "--rebuild-tree run detected. Please run\n"
1596                                  "reiserfsck --rebuild-tree and wait for a "
1597                                  "completion. If that fails\n"
1598                                  "get newer reiserfsprogs package");
1599                 return 1;
1600         }
1601
1602         SB_BUFFER_WITH_SB(s) = bh;
1603         SB_DISK_SUPER_BLOCK(s) = rs;
1604
1605         /*
1606          * magic is of non-standard journal filesystem, look at s_version to
1607          * find which format is in use
1608          */
1609         if (is_reiserfs_jr(rs)) {
1610                 if (sb_version(rs) == REISERFS_VERSION_2)
1611                         reiserfs_info(s, "found reiserfs format \"3.6\""
1612                                       " with non-standard journal\n");
1613                 else if (sb_version(rs) == REISERFS_VERSION_1)
1614                         reiserfs_info(s, "found reiserfs format \"3.5\""
1615                                       " with non-standard journal\n");
1616                 else {
1617                         reiserfs_warning(s, "sh-2012", "found unknown "
1618                                          "format \"%u\" of reiserfs with "
1619                                          "non-standard magic", sb_version(rs));
1620                         return 1;
1621                 }
1622         } else
1623                 /*
1624                  * s_version of standard format may contain incorrect
1625                  * information, so we just look at the magic string
1626                  */
1627                 reiserfs_info(s,
1628                               "found reiserfs format \"%s\" with standard journal\n",
1629                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1630
1631         s->s_op = &reiserfs_sops;
1632         s->s_export_op = &reiserfs_export_ops;
1633 #ifdef CONFIG_QUOTA
1634         s->s_qcop = &reiserfs_qctl_operations;
1635         s->dq_op = &reiserfs_quota_operations;
1636 #endif
1637
1638         /*
1639          * new format is limited by the 32 bit wide i_blocks field, want to
1640          * be one full block below that.
1641          */
1642         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1643         return 0;
1644 }
1645
1646 /* after journal replay, reread all bitmap and super blocks */
1647 static int reread_meta_blocks(struct super_block *s)
1648 {
1649         ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1650         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1651         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1652                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1653                 return 1;
1654         }
1655
1656         return 0;
1657 }
1658
1659 /* hash detection stuff */
1660
1661 /*
1662  * if root directory is empty - we set default - Yura's - hash and
1663  * warn about it
1664  * FIXME: we look for only one name in a directory. If tea and yura
1665  * both have the same value - we ask user to send report to the
1666  * mailing list
1667  */
1668 static __u32 find_hash_out(struct super_block *s)
1669 {
1670         int retval;
1671         struct inode *inode;
1672         struct cpu_key key;
1673         INITIALIZE_PATH(path);
1674         struct reiserfs_dir_entry de;
1675         struct reiserfs_de_head *deh;
1676         __u32 hash = DEFAULT_HASH;
1677         __u32 deh_hashval, teahash, r5hash, yurahash;
1678
1679         inode = s->s_root->d_inode;
1680
1681         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1682         retval = search_by_entry_key(s, &key, &path, &de);
1683         if (retval == IO_ERROR) {
1684                 pathrelse(&path);
1685                 return UNSET_HASH;
1686         }
1687         if (retval == NAME_NOT_FOUND)
1688                 de.de_entry_num--;
1689
1690         set_de_name_and_namelen(&de);
1691         deh = de.de_deh + de.de_entry_num;
1692
1693         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1694                 /* allow override in this case */
1695                 if (reiserfs_rupasov_hash(s))
1696                         hash = YURA_HASH;
1697                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1698                 goto out;
1699         }
1700
1701         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1702         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1703         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1704         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1705
1706         if ((teahash == r5hash && deh_hashval == r5hash) ||
1707             (teahash == yurahash && deh_hashval == yurahash) ||
1708             (r5hash == yurahash && deh_hashval == yurahash)) {
1709                 reiserfs_warning(s, "reiserfs-2506",
1710                                  "Unable to automatically detect hash "
1711                                  "function. Please mount with -o "
1712                                  "hash={tea,rupasov,r5}");
1713                 hash = UNSET_HASH;
1714                 goto out;
1715         }
1716
1717         if (deh_hashval == yurahash)
1718                 hash = YURA_HASH;
1719         else if (deh_hashval == teahash)
1720                 hash = TEA_HASH;
1721         else if (deh_hashval == r5hash)
1722                 hash = R5_HASH;
1723         else {
1724                 reiserfs_warning(s, "reiserfs-2506",
1725                                  "Unrecognised hash function");
1726                 hash = UNSET_HASH;
1727         }
1728 out:
1729         pathrelse(&path);
1730         return hash;
1731 }
1732
1733 /* finds out which hash names are sorted with */
1734 static int what_hash(struct super_block *s)
1735 {
1736         __u32 code;
1737
1738         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1739
1740         /*
1741          * reiserfs_hash_detect() == true if any of the hash mount options
1742          * were used.  We must check them to make sure the user isn't
1743          * using a bad hash value
1744          */
1745         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1746                 code = find_hash_out(s);
1747
1748         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1749                 /*
1750                  * detection has found the hash, and we must check against the
1751                  * mount options
1752                  */
1753                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1754                         reiserfs_warning(s, "reiserfs-2507",
1755                                          "Error, %s hash detected, "
1756                                          "unable to force rupasov hash",
1757                                          reiserfs_hashname(code));
1758                         code = UNSET_HASH;
1759                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1760                         reiserfs_warning(s, "reiserfs-2508",
1761                                          "Error, %s hash detected, "
1762                                          "unable to force tea hash",
1763                                          reiserfs_hashname(code));
1764                         code = UNSET_HASH;
1765                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1766                         reiserfs_warning(s, "reiserfs-2509",
1767                                          "Error, %s hash detected, "
1768                                          "unable to force r5 hash",
1769                                          reiserfs_hashname(code));
1770                         code = UNSET_HASH;
1771                 }
1772         } else {
1773                 /*
1774                  * find_hash_out was not called or
1775                  * could not determine the hash
1776                  */
1777                 if (reiserfs_rupasov_hash(s)) {
1778                         code = YURA_HASH;
1779                 } else if (reiserfs_tea_hash(s)) {
1780                         code = TEA_HASH;
1781                 } else if (reiserfs_r5_hash(s)) {
1782                         code = R5_HASH;
1783                 }
1784         }
1785
1786         /*
1787          * if we are mounted RW, and we have a new valid hash code, update
1788          * the super
1789          */
1790         if (code != UNSET_HASH &&
1791             !(s->s_flags & MS_RDONLY) &&
1792             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1793                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1794         }
1795         return code;
1796 }
1797
1798 /* return pointer to appropriate function */
1799 static hashf_t hash_function(struct super_block *s)
1800 {
1801         switch (what_hash(s)) {
1802         case TEA_HASH:
1803                 reiserfs_info(s, "Using tea hash to sort names\n");
1804                 return keyed_hash;
1805         case YURA_HASH:
1806                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1807                 return yura_hash;
1808         case R5_HASH:
1809                 reiserfs_info(s, "Using r5 hash to sort names\n");
1810                 return r5_hash;
1811         }
1812         return NULL;
1813 }
1814
1815 /* this is used to set up correct value for old partitions */
1816 static int function2code(hashf_t func)
1817 {
1818         if (func == keyed_hash)
1819                 return TEA_HASH;
1820         if (func == yura_hash)
1821                 return YURA_HASH;
1822         if (func == r5_hash)
1823                 return R5_HASH;
1824
1825         BUG();                  /* should never happen */
1826
1827         return 0;
1828 }
1829
1830 #define SWARN(silent, s, id, ...)                       \
1831         if (!(silent))                          \
1832                 reiserfs_warning(s, id, __VA_ARGS__)
1833
1834 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1835 {
1836         struct inode *root_inode;
1837         struct reiserfs_transaction_handle th;
1838         int old_format = 0;
1839         unsigned long blocks;
1840         unsigned int commit_max_age = 0;
1841         int jinit_done = 0;
1842         struct reiserfs_iget_args args;
1843         struct reiserfs_super_block *rs;
1844         char *jdev_name;
1845         struct reiserfs_sb_info *sbi;
1846         int errval = -EINVAL;
1847         char *qf_names[MAXQUOTAS] = {};
1848         unsigned int qfmt = 0;
1849
1850         save_mount_options(s, data);
1851
1852         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1853         if (!sbi)
1854                 return -ENOMEM;
1855         s->s_fs_info = sbi;
1856         /* Set default values for options: non-aggressive tails, RO on errors */
1857         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1858         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1859         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1860         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1861         sbi->s_alloc_options.preallocmin = 0;
1862         /* Preallocate by 16 blocks (17-1) at once */
1863         sbi->s_alloc_options.preallocsize = 17;
1864         /* setup default block allocator options */
1865         reiserfs_init_alloc_options(s);
1866
1867         spin_lock_init(&sbi->old_work_lock);
1868         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1869         mutex_init(&sbi->lock);
1870         sbi->lock_depth = -1;
1871
1872         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1873                                          s->s_id);
1874         if (!sbi->commit_wq) {
1875                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1876                 errval = -ENOMEM;
1877                 goto error_unlocked;
1878         }
1879
1880         jdev_name = NULL;
1881         if (reiserfs_parse_options
1882             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1883              &commit_max_age, qf_names, &qfmt) == 0) {
1884                 goto error_unlocked;
1885         }
1886         if (jdev_name && jdev_name[0]) {
1887                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1888                 if (!sbi->s_jdev) {
1889                         SWARN(silent, s, "", "Cannot allocate memory for "
1890                                 "journal device name");
1891                         goto error;
1892                 }
1893         }
1894 #ifdef CONFIG_QUOTA
1895         handle_quota_files(s, qf_names, &qfmt);
1896 #endif
1897
1898         if (blocks) {
1899                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1900                 goto error_unlocked;
1901         }
1902
1903         /*
1904          * try old format (undistributed bitmap, super block in 8-th 1k
1905          * block of a device)
1906          */
1907         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1908                 old_format = 1;
1909
1910         /*
1911          * try new format (64-th 1k block), which can contain reiserfs
1912          * super block
1913          */
1914         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1915                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1916                       s->s_id);
1917                 goto error_unlocked;
1918         }
1919
1920         rs = SB_DISK_SUPER_BLOCK(s);
1921         /*
1922          * Let's do basic sanity check to verify that underlying device is not
1923          * smaller than the filesystem. If the check fails then abort and
1924          * scream, because bad stuff will happen otherwise.
1925          */
1926         if (s->s_bdev && s->s_bdev->bd_inode
1927             && i_size_read(s->s_bdev->bd_inode) <
1928             sb_block_count(rs) * sb_blocksize(rs)) {
1929                 SWARN(silent, s, "", "Filesystem cannot be "
1930                       "mounted because it is bigger than the device");
1931                 SWARN(silent, s, "", "You may need to run fsck "
1932                       "or increase size of your LVM partition");
1933                 SWARN(silent, s, "", "Or may be you forgot to "
1934                       "reboot after fdisk when it told you to");
1935                 goto error_unlocked;
1936         }
1937
1938         sbi->s_mount_state = SB_REISERFS_STATE(s);
1939         sbi->s_mount_state = REISERFS_VALID_FS;
1940
1941         if ((errval = reiserfs_init_bitmap_cache(s))) {
1942                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1943                 goto error_unlocked;
1944         }
1945
1946         errval = -EINVAL;
1947 #ifdef CONFIG_REISERFS_CHECK
1948         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1949         SWARN(silent, s, "", "- it is slow mode for debugging.");
1950 #endif
1951
1952         /* make data=ordered the default */
1953         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1954             !reiserfs_data_writeback(s)) {
1955                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1956         }
1957
1958         if (reiserfs_data_log(s)) {
1959                 reiserfs_info(s, "using journaled data mode\n");
1960         } else if (reiserfs_data_ordered(s)) {
1961                 reiserfs_info(s, "using ordered data mode\n");
1962         } else {
1963                 reiserfs_info(s, "using writeback data mode\n");
1964         }
1965         if (reiserfs_barrier_flush(s)) {
1966                 printk("reiserfs: using flush barriers\n");
1967         }
1968
1969         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1970                 SWARN(silent, s, "sh-2022",
1971                       "unable to initialize journal space");
1972                 goto error_unlocked;
1973         } else {
1974                 /*
1975                  * once this is set, journal_release must be called
1976                  * if we error out of the mount
1977                  */
1978                 jinit_done = 1;
1979         }
1980
1981         if (reread_meta_blocks(s)) {
1982                 SWARN(silent, s, "jmacd-9",
1983                       "unable to reread meta blocks after journal init");
1984                 goto error_unlocked;
1985         }
1986
1987         if (replay_only(s))
1988                 goto error_unlocked;
1989
1990         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1991                 SWARN(silent, s, "clm-7000",
1992                       "Detected readonly device, marking FS readonly");
1993                 s->s_flags |= MS_RDONLY;
1994         }
1995         args.objectid = REISERFS_ROOT_OBJECTID;
1996         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1997         root_inode =
1998             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1999                          reiserfs_init_locked_inode, (void *)&args);
2000         if (!root_inode) {
2001                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2002                 goto error_unlocked;
2003         }
2004
2005         /*
2006          * This path assumed to be called with the BKL in the old times.
2007          * Now we have inherited the big reiserfs lock from it and many
2008          * reiserfs helpers called in the mount path and elsewhere require
2009          * this lock to be held even if it's not always necessary. Let's be
2010          * conservative and hold it early. The window can be reduced after
2011          * careful review of the code.
2012          */
2013         reiserfs_write_lock(s);
2014
2015         if (root_inode->i_state & I_NEW) {
2016                 reiserfs_read_locked_inode(root_inode, &args);
2017                 unlock_new_inode(root_inode);
2018         }
2019
2020         s->s_root = d_make_root(root_inode);
2021         if (!s->s_root)
2022                 goto error;
2023         /* define and initialize hash function */
2024         sbi->s_hash_function = hash_function(s);
2025         if (sbi->s_hash_function == NULL) {
2026                 dput(s->s_root);
2027                 s->s_root = NULL;
2028                 goto error;
2029         }
2030
2031         if (is_reiserfs_3_5(rs)
2032             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2033                 set_bit(REISERFS_3_5, &sbi->s_properties);
2034         else if (old_format)
2035                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2036         else
2037                 set_bit(REISERFS_3_6, &sbi->s_properties);
2038
2039         if (!(s->s_flags & MS_RDONLY)) {
2040
2041                 errval = journal_begin(&th, s, 1);
2042                 if (errval) {
2043                         dput(s->s_root);
2044                         s->s_root = NULL;
2045                         goto error;
2046                 }
2047                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2048
2049                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2050                 set_sb_fs_state(rs, 0);
2051
2052                 /*
2053                  * Clear out s_bmap_nr if it would wrap. We can handle this
2054                  * case, but older revisions can't. This will cause the
2055                  * file system to fail mount on those older implementations,
2056                  * avoiding corruption. -jeffm
2057                  */
2058                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2059                     sb_bmap_nr(rs) != 0) {
2060                         reiserfs_warning(s, "super-2030", "This file system "
2061                                         "claims to use %u bitmap blocks in "
2062                                         "its super block, but requires %u. "
2063                                         "Clearing to zero.", sb_bmap_nr(rs),
2064                                         reiserfs_bmap_count(s));
2065
2066                         set_sb_bmap_nr(rs, 0);
2067                 }
2068
2069                 if (old_format_only(s)) {
2070                         /*
2071                          * filesystem of format 3.5 either with standard
2072                          * or non-standard journal
2073                          */
2074                         if (convert_reiserfs(s)) {
2075                                 /* and -o conv is given */
2076                                 if (!silent)
2077                                         reiserfs_info(s,
2078                                                       "converting 3.5 filesystem to the 3.6 format");
2079
2080                                 if (is_reiserfs_3_5(rs))
2081                                         /*
2082                                          * put magic string of 3.6 format.
2083                                          * 2.2 will not be able to
2084                                          * mount this filesystem anymore
2085                                          */
2086                                         memcpy(rs->s_v1.s_magic,
2087                                                reiserfs_3_6_magic_string,
2088                                                sizeof
2089                                                (reiserfs_3_6_magic_string));
2090
2091                                 set_sb_version(rs, REISERFS_VERSION_2);
2092                                 reiserfs_convert_objectid_map_v1(s);
2093                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2094                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2095                         } else if (!silent) {
2096                                 reiserfs_info(s, "using 3.5.x disk format\n");
2097                         }
2098                 } else
2099                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2100
2101
2102                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2103                 errval = journal_end(&th);
2104                 if (errval) {
2105                         dput(s->s_root);
2106                         s->s_root = NULL;
2107                         goto error;
2108                 }
2109
2110                 reiserfs_write_unlock(s);
2111                 if ((errval = reiserfs_lookup_privroot(s)) ||
2112                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2113                         dput(s->s_root);
2114                         s->s_root = NULL;
2115                         goto error_unlocked;
2116                 }
2117                 reiserfs_write_lock(s);
2118
2119                 /*
2120                  * look for files which were to be removed in previous session
2121                  */
2122                 finish_unfinished(s);
2123         } else {
2124                 if (old_format_only(s) && !silent) {
2125                         reiserfs_info(s, "using 3.5.x disk format\n");
2126                 }
2127
2128                 reiserfs_write_unlock(s);
2129                 if ((errval = reiserfs_lookup_privroot(s)) ||
2130                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2131                         dput(s->s_root);
2132                         s->s_root = NULL;
2133                         goto error_unlocked;
2134                 }
2135                 reiserfs_write_lock(s);
2136         }
2137         /*
2138          * mark hash in super block: it could be unset. overwrite should be ok
2139          */
2140         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2141
2142         handle_attrs(s);
2143
2144         reiserfs_proc_info_init(s);
2145
2146         init_waitqueue_head(&(sbi->s_wait));
2147         spin_lock_init(&sbi->bitmap_lock);
2148
2149         reiserfs_write_unlock(s);
2150
2151         return (0);
2152
2153 error:
2154         reiserfs_write_unlock(s);
2155
2156 error_unlocked:
2157         /* kill the commit thread, free journal ram */
2158         if (jinit_done) {
2159                 reiserfs_write_lock(s);
2160                 journal_release_error(NULL, s);
2161                 reiserfs_write_unlock(s);
2162         }
2163
2164         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2165
2166         reiserfs_free_bitmap_cache(s);
2167         if (SB_BUFFER_WITH_SB(s))
2168                 brelse(SB_BUFFER_WITH_SB(s));
2169 #ifdef CONFIG_QUOTA
2170         {
2171                 int j;
2172                 for (j = 0; j < MAXQUOTAS; j++)
2173                         kfree(qf_names[j]);
2174         }
2175 #endif
2176         kfree(sbi);
2177
2178         s->s_fs_info = NULL;
2179         return errval;
2180 }
2181
2182 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2183 {
2184         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2185
2186         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2187         buf->f_bfree = sb_free_blocks(rs);
2188         buf->f_bavail = buf->f_bfree;
2189         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2190         buf->f_bsize = dentry->d_sb->s_blocksize;
2191         /* changed to accommodate gcc folks. */
2192         buf->f_type = REISERFS_SUPER_MAGIC;
2193         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2194         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2195                                 sizeof(rs->s_uuid)/2);
2196
2197         return 0;
2198 }
2199
2200 #ifdef CONFIG_QUOTA
2201 static int reiserfs_write_dquot(struct dquot *dquot)
2202 {
2203         struct reiserfs_transaction_handle th;
2204         int ret, err;
2205         int depth;
2206
2207         reiserfs_write_lock(dquot->dq_sb);
2208         ret =
2209             journal_begin(&th, dquot->dq_sb,
2210                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2211         if (ret)
2212                 goto out;
2213         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2214         ret = dquot_commit(dquot);
2215         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2216         err = journal_end(&th);
2217         if (!ret && err)
2218                 ret = err;
2219 out:
2220         reiserfs_write_unlock(dquot->dq_sb);
2221         return ret;
2222 }
2223
2224 static int reiserfs_acquire_dquot(struct dquot *dquot)
2225 {
2226         struct reiserfs_transaction_handle th;
2227         int ret, err;
2228         int depth;
2229
2230         reiserfs_write_lock(dquot->dq_sb);
2231         ret =
2232             journal_begin(&th, dquot->dq_sb,
2233                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2234         if (ret)
2235                 goto out;
2236         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2237         ret = dquot_acquire(dquot);
2238         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2239         err = journal_end(&th);
2240         if (!ret && err)
2241                 ret = err;
2242 out:
2243         reiserfs_write_unlock(dquot->dq_sb);
2244         return ret;
2245 }
2246
2247 static int reiserfs_release_dquot(struct dquot *dquot)
2248 {
2249         struct reiserfs_transaction_handle th;
2250         int ret, err;
2251
2252         reiserfs_write_lock(dquot->dq_sb);
2253         ret =
2254             journal_begin(&th, dquot->dq_sb,
2255                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2256         reiserfs_write_unlock(dquot->dq_sb);
2257         if (ret) {
2258                 /* Release dquot anyway to avoid endless cycle in dqput() */
2259                 dquot_release(dquot);
2260                 goto out;
2261         }
2262         ret = dquot_release(dquot);
2263         reiserfs_write_lock(dquot->dq_sb);
2264         err = journal_end(&th);
2265         if (!ret && err)
2266                 ret = err;
2267         reiserfs_write_unlock(dquot->dq_sb);
2268 out:
2269         return ret;
2270 }
2271
2272 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2273 {
2274         /* Are we journaling quotas? */
2275         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2276             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2277                 dquot_mark_dquot_dirty(dquot);
2278                 return reiserfs_write_dquot(dquot);
2279         } else
2280                 return dquot_mark_dquot_dirty(dquot);
2281 }
2282
2283 static int reiserfs_write_info(struct super_block *sb, int type)
2284 {
2285         struct reiserfs_transaction_handle th;
2286         int ret, err;
2287         int depth;
2288
2289         /* Data block + inode block */
2290         reiserfs_write_lock(sb);
2291         ret = journal_begin(&th, sb, 2);
2292         if (ret)
2293                 goto out;
2294         depth = reiserfs_write_unlock_nested(sb);
2295         ret = dquot_commit_info(sb, type);
2296         reiserfs_write_lock_nested(sb, depth);
2297         err = journal_end(&th);
2298         if (!ret && err)
2299                 ret = err;
2300 out:
2301         reiserfs_write_unlock(sb);
2302         return ret;
2303 }
2304
2305 /*
2306  * Turn on quotas during mount time - we need to find the quota file and such...
2307  */
2308 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2309 {
2310         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2311                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2312 }
2313
2314 /*
2315  * Standard function to be called on quota_on
2316  */
2317 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2318                              struct path *path)
2319 {
2320         int err;
2321         struct inode *inode;
2322         struct reiserfs_transaction_handle th;
2323         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2324
2325         reiserfs_write_lock(sb);
2326         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2327                 err = -EINVAL;
2328                 goto out;
2329         }
2330
2331         /* Quotafile not on the same filesystem? */
2332         if (path->dentry->d_sb != sb) {
2333                 err = -EXDEV;
2334                 goto out;
2335         }
2336         inode = path->dentry->d_inode;
2337         /*
2338          * We must not pack tails for quota files on reiserfs for quota
2339          * IO to work
2340          */
2341         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2342                 err = reiserfs_unpack(inode, NULL);
2343                 if (err) {
2344                         reiserfs_warning(sb, "super-6520",
2345                                 "Unpacking tail of quota file failed"
2346                                 " (%d). Cannot turn on quotas.", err);
2347                         err = -EINVAL;
2348                         goto out;
2349                 }
2350                 mark_inode_dirty(inode);
2351         }
2352         /* Journaling quota? */
2353         if (REISERFS_SB(sb)->s_qf_names[type]) {
2354                 /* Quotafile not of fs root? */
2355                 if (path->dentry->d_parent != sb->s_root)
2356                         reiserfs_warning(sb, "super-6521",
2357                                  "Quota file not on filesystem root. "
2358                                  "Journalled quota will not work.");
2359         }
2360
2361         /*
2362          * When we journal data on quota file, we have to flush journal to see
2363          * all updates to the file when we bypass pagecache...
2364          */
2365         if (reiserfs_file_data_log(inode)) {
2366                 /* Just start temporary transaction and finish it */
2367                 err = journal_begin(&th, sb, 1);
2368                 if (err)
2369                         goto out;
2370                 err = journal_end_sync(&th);
2371                 if (err)
2372                         goto out;
2373         }
2374         reiserfs_write_unlock(sb);
2375         return dquot_quota_on(sb, type, format_id, path);
2376 out:
2377         reiserfs_write_unlock(sb);
2378         return err;
2379 }
2380
2381 /*
2382  * Read data from quotafile - avoid pagecache and such because we cannot afford
2383  * acquiring the locks... As quota files are never truncated and quota code
2384  * itself serializes the operations (and no one else should touch the files)
2385  * we don't have to be afraid of races
2386  */
2387 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2388                                    size_t len, loff_t off)
2389 {
2390         struct inode *inode = sb_dqopt(sb)->files[type];
2391         unsigned long blk = off >> sb->s_blocksize_bits;
2392         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2393         size_t toread;
2394         struct buffer_head tmp_bh, *bh;
2395         loff_t i_size = i_size_read(inode);
2396
2397         if (off > i_size)
2398                 return 0;
2399         if (off + len > i_size)
2400                 len = i_size - off;
2401         toread = len;
2402         while (toread > 0) {
2403                 tocopy =
2404                     sb->s_blocksize - offset <
2405                     toread ? sb->s_blocksize - offset : toread;
2406                 tmp_bh.b_state = 0;
2407                 /*
2408                  * Quota files are without tails so we can safely
2409                  * use this function
2410                  */
2411                 reiserfs_write_lock(sb);
2412                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2413                 reiserfs_write_unlock(sb);
2414                 if (err)
2415                         return err;
2416                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2417                         memset(data, 0, tocopy);
2418                 else {
2419                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2420                         if (!bh)
2421                                 return -EIO;
2422                         memcpy(data, bh->b_data + offset, tocopy);
2423                         brelse(bh);
2424                 }
2425                 offset = 0;
2426                 toread -= tocopy;
2427                 data += tocopy;
2428                 blk++;
2429         }
2430         return len;
2431 }
2432
2433 /*
2434  * Write to quotafile (we know the transaction is already started and has
2435  * enough credits)
2436  */
2437 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2438                                     const char *data, size_t len, loff_t off)
2439 {
2440         struct inode *inode = sb_dqopt(sb)->files[type];
2441         unsigned long blk = off >> sb->s_blocksize_bits;
2442         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2443         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2444         size_t towrite = len;
2445         struct buffer_head tmp_bh, *bh;
2446
2447         if (!current->journal_info) {
2448                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2449                         (unsigned long long)off, (unsigned long long)len);
2450                 return -EIO;
2451         }
2452         while (towrite > 0) {
2453                 tocopy = sb->s_blocksize - offset < towrite ?
2454                     sb->s_blocksize - offset : towrite;
2455                 tmp_bh.b_state = 0;
2456                 reiserfs_write_lock(sb);
2457                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2458                 reiserfs_write_unlock(sb);
2459                 if (err)
2460                         goto out;
2461                 if (offset || tocopy != sb->s_blocksize)
2462                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2463                 else
2464                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2465                 if (!bh) {
2466                         err = -EIO;
2467                         goto out;
2468                 }
2469                 lock_buffer(bh);
2470                 memcpy(bh->b_data + offset, data, tocopy);
2471                 flush_dcache_page(bh->b_page);
2472                 set_buffer_uptodate(bh);
2473                 unlock_buffer(bh);
2474                 reiserfs_write_lock(sb);
2475                 reiserfs_prepare_for_journal(sb, bh, 1);
2476                 journal_mark_dirty(current->journal_info, bh);
2477                 if (!journal_quota)
2478                         reiserfs_add_ordered_list(inode, bh);
2479                 reiserfs_write_unlock(sb);
2480                 brelse(bh);
2481                 offset = 0;
2482                 towrite -= tocopy;
2483                 data += tocopy;
2484                 blk++;
2485         }
2486 out:
2487         if (len == towrite)
2488                 return err;
2489         if (inode->i_size < off + len - towrite)
2490                 i_size_write(inode, off + len - towrite);
2491         inode->i_version++;
2492         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2493         mark_inode_dirty(inode);
2494         return len - towrite;
2495 }
2496
2497 #endif
2498
2499 static struct dentry *get_super_block(struct file_system_type *fs_type,
2500                            int flags, const char *dev_name,
2501                            void *data)
2502 {
2503         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2504 }
2505
2506 static int __init init_reiserfs_fs(void)
2507 {
2508         int ret;
2509
2510         ret = init_inodecache();
2511         if (ret)
2512                 return ret;
2513
2514         reiserfs_proc_info_global_init();
2515
2516         ret = register_filesystem(&reiserfs_fs_type);
2517         if (ret)
2518                 goto out;
2519
2520         return 0;
2521 out:
2522         reiserfs_proc_info_global_done();
2523         destroy_inodecache();
2524
2525         return ret;
2526 }
2527
2528 static void __exit exit_reiserfs_fs(void)
2529 {
2530         reiserfs_proc_info_global_done();
2531         unregister_filesystem(&reiserfs_fs_type);
2532         destroy_inodecache();
2533 }
2534
2535 struct file_system_type reiserfs_fs_type = {
2536         .owner = THIS_MODULE,
2537         .name = "reiserfs",
2538         .mount = get_super_block,
2539         .kill_sb = reiserfs_kill_sb,
2540         .fs_flags = FS_REQUIRES_DEV,
2541 };
2542 MODULE_ALIAS_FS("reiserfs");
2543
2544 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2545 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2546 MODULE_LICENSE("GPL");
2547
2548 module_init(init_reiserfs_fs);
2549 module_exit(exit_reiserfs_fs);