kernel/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/backing-dev.h>
  25 #include <linux/buffer_head.h>
  26 #include <linux/exportfs.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/vfs.h>
  29 #include <linux/mount.h>
  30 #include <linux/namei.h>
  31 #include <linux/crc32.h>
  32 #include <linux/seq_file.h>
  33
  34 struct file_system_type reiserfs_fs_type;
  35
  36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  39
  40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  41 {
  42         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  43                         strlen(reiserfs_3_5_magic_string));
  44 }
  45
  46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  47 {
  48         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  49                         strlen(reiserfs_3_6_magic_string));
  50 }
  51
  52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  53 {
  54         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  55                         strlen(reiserfs_jr_magic_string));
  56 }
  57
  58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  59 {
  60         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  61                 is_reiserfs_jr(rs));
  62 }
  63
  64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         sbi->work_queued = 0;
  94         spin_unlock(&sbi->old_work_lock);
  95
  96         reiserfs_sync_fs(s, 1);
  97 }
  98
  99 void reiserfs_schedule_old_flush(struct super_block *s)
 100 {
 101         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 102         unsigned long delay;
 103
 104         /*
 105          * Avoid scheduling flush when sb is being shut down. It can race
 106          * with journal shutdown and free still queued delayed work.
 107          */
 108         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 109                 return;
 110
 111         spin_lock(&sbi->old_work_lock);
 112         if (!sbi->work_queued) {
 113                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 114                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 115                 sbi->work_queued = 1;
 116         }
 117         spin_unlock(&sbi->old_work_lock);
 118 }
 119
 120 static void cancel_old_flush(struct super_block *s)
 121 {
 122         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 123
 124         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 125         spin_lock(&sbi->old_work_lock);
 126         sbi->work_queued = 0;
 127         spin_unlock(&sbi->old_work_lock);
 128 }
 129
 130 static int reiserfs_freeze(struct super_block *s)
 131 {
 132         struct reiserfs_transaction_handle th;
 133
 134         cancel_old_flush(s);
 135
 136         reiserfs_write_lock(s);
 137         if (!(s->s_flags & MS_RDONLY)) {
 138                 int err = journal_begin(&th, s, 1);
 139                 if (err) {
 140                         reiserfs_block_writes(&th);
 141                 } else {
 142                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 143                                                      1);
 144                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 145                         reiserfs_block_writes(&th);
 146                         journal_end_sync(&th);
 147                 }
 148         }
 149         reiserfs_write_unlock(s);
 150         return 0;
 151 }
 152
 153 static int reiserfs_unfreeze(struct super_block *s)
 154 {
 155         reiserfs_allow_writes(s);
 156         return 0;
 157 }
 158
 159 extern const struct in_core_key MAX_IN_CORE_KEY;
 160
 161 /*
 162  * this is used to delete "save link" when there are no items of a
 163  * file it points to. It can either happen if unlink is completed but
 164  * "save unlink" removal, or if file has both unlink and truncate
 165  * pending and as unlink completes first (because key of "save link"
 166  * protecting unlink is bigger that a key lf "save link" which
 167  * protects truncate), so there left no items to make truncate
 168  * completion on
 169  */
 170 static int remove_save_link_only(struct super_block *s,
 171                                  struct reiserfs_key *key, int oid_free)
 172 {
 173         struct reiserfs_transaction_handle th;
 174         int err;
 175
 176         /* we are going to do one balancing */
 177         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 178         if (err)
 179                 return err;
 180
 181         reiserfs_delete_solid_item(&th, NULL, key);
 182         if (oid_free)
 183                 /* removals are protected by direct items */
 184                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 185
 186         return journal_end(&th);
 187 }
 188
 189 #ifdef CONFIG_QUOTA
 190 static int reiserfs_quota_on_mount(struct super_block *, int);
 191 #endif
 192
 193 /*
 194  * Look for uncompleted unlinks and truncates and complete them
 195  *
 196  * Called with superblock write locked.  If quotas are enabled, we have to
 197  * release/retake lest we call dquot_quota_on_mount(), proceed to
 198  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
 199  * cpu worklets to complete flush_async_commits() that in turn wait for the
 200  * superblock write lock.
 201  */
 202 static int finish_unfinished(struct super_block *s)
 203 {
 204         INITIALIZE_PATH(path);
 205         struct cpu_key max_cpu_key, obj_key;
 206         struct reiserfs_key save_link_key, last_inode_key;
 207         int retval = 0;
 208         struct item_head *ih;
 209         struct buffer_head *bh;
 210         int item_pos;
 211         char *item;
 212         int done;
 213         struct inode *inode;
 214         int truncate;
 215 #ifdef CONFIG_QUOTA
 216         int i;
 217         int ms_active_set;
 218         int quota_enabled[REISERFS_MAXQUOTAS];
 219 #endif
 220
 221         /* compose key to look for "save" links */
 222         max_cpu_key.version = KEY_FORMAT_3_5;
 223         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 224         max_cpu_key.on_disk_key.k_objectid = ~0U;
 225         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 226         max_cpu_key.key_length = 3;
 227
 228         memset(&last_inode_key, 0, sizeof(last_inode_key));
 229
 230 #ifdef CONFIG_QUOTA
 231         /* Needed for iput() to work correctly and not trash data */
 232         if (s->s_flags & MS_ACTIVE) {
 233                 ms_active_set = 0;
 234         } else {
 235                 ms_active_set = 1;
 236                 s->s_flags |= MS_ACTIVE;
 237         }
 238         /* Turn on quotas so that they are updated correctly */
 239         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 240                 quota_enabled[i] = 1;
 241                 if (REISERFS_SB(s)->s_qf_names[i]) {
 242                         int ret;
 243
 244                         if (sb_has_quota_active(s, i)) {
 245                                 quota_enabled[i] = 0;
 246                                 continue;
 247                         }
 248                         reiserfs_write_unlock(s);
 249                         ret = reiserfs_quota_on_mount(s, i);
 250                         reiserfs_write_lock(s);
 251                         if (ret < 0)
 252                                 reiserfs_warning(s, "reiserfs-2500",
 253                                                  "cannot turn on journaled "
 254                                                  "quota: error %d", ret);
 255                 }
 256         }
 257 #endif
 258
 259         done = 0;
 260         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 261         while (!retval) {
 262                 int depth;
 263                 retval = search_item(s, &max_cpu_key, &path);
 264                 if (retval != ITEM_NOT_FOUND) {
 265                         reiserfs_error(s, "vs-2140",
 266                                        "search_by_key returned %d", retval);
 267                         break;
 268                 }
 269
 270                 bh = get_last_bh(&path);
 271                 item_pos = get_item_pos(&path);
 272                 if (item_pos != B_NR_ITEMS(bh)) {
 273                         reiserfs_warning(s, "vs-2060",
 274                                          "wrong position found");
 275                         break;
 276                 }
 277                 item_pos--;
 278                 ih = item_head(bh, item_pos);
 279
 280                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 281                         /* there are no "save" links anymore */
 282                         break;
 283
 284                 save_link_key = ih->ih_key;
 285                 if (is_indirect_le_ih(ih))
 286                         truncate = 1;
 287                 else
 288                         truncate = 0;
 289
 290                 /* reiserfs_iget needs k_dirid and k_objectid only */
 291                 item = ih_item_body(bh, ih);
 292                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 293                 obj_key.on_disk_key.k_objectid =
 294                     le32_to_cpu(ih->ih_key.k_objectid);
 295                 obj_key.on_disk_key.k_offset = 0;
 296                 obj_key.on_disk_key.k_type = 0;
 297
 298                 pathrelse(&path);
 299
 300                 inode = reiserfs_iget(s, &obj_key);
 301                 if (!inode) {
 302                         /*
 303                          * the unlink almost completed, it just did not
 304                          * manage to remove "save" link and release objectid
 305                          */
 306                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 307                                          &obj_key);
 308                         retval = remove_save_link_only(s, &save_link_key, 1);
 309                         continue;
 310                 }
 311
 312                 if (!truncate && inode->i_nlink) {
 313                         /* file is not unlinked */
 314                         reiserfs_warning(s, "vs-2185",
 315                                          "file %K is not unlinked",
 316                                          &obj_key);
 317                         retval = remove_save_link_only(s, &save_link_key, 0);
 318                         continue;
 319                 }
 320                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 321                 dquot_initialize(inode);
 322                 reiserfs_write_lock_nested(inode->i_sb, depth);
 323
 324                 if (truncate && S_ISDIR(inode->i_mode)) {
 325                         /*
 326                          * We got a truncate request for a dir which
 327                          * is impossible.  The only imaginable way is to
 328                          * execute unfinished truncate request then boot
 329                          * into old kernel, remove the file and create dir
 330                          * with the same key.
 331                          */
 332                         reiserfs_warning(s, "green-2101",
 333                                          "impossible truncate on a "
 334                                          "directory %k. Please report",
 335                                          INODE_PKEY(inode));
 336                         retval = remove_save_link_only(s, &save_link_key, 0);
 337                         truncate = 0;
 338                         iput(inode);
 339                         continue;
 340                 }
 341
 342                 if (truncate) {
 343                         REISERFS_I(inode)->i_flags |=
 344                             i_link_saved_truncate_mask;
 345                         /*
 346                          * not completed truncate found. New size was
 347                          * committed together with "save" link
 348                          */
 349                         reiserfs_info(s, "Truncating %k to %lld ..",
 350                                       INODE_PKEY(inode), inode->i_size);
 351
 352                         /* don't update modification time */
 353                         reiserfs_truncate_file(inode, 0);
 354
 355                         retval = remove_save_link(inode, truncate);
 356                 } else {
 357                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 358                         /* not completed unlink (rmdir) found */
 359                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 360                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 361                                         sizeof(last_inode_key))){
 362                                 last_inode_key = *INODE_PKEY(inode);
 363                                 /* removal gets completed in iput */
 364                                 retval = 0;
 365                         } else {
 366                                 reiserfs_warning(s, "super-2189", "Dead loop "
 367                                                  "in finish_unfinished "
 368                                                  "detected, just remove "
 369                                                  "save link\n");
 370                                 retval = remove_save_link_only(s,
 371                                                         &save_link_key, 0);
 372                         }
 373                 }
 374
 375                 iput(inode);
 376                 printk("done\n");
 377                 done++;
 378         }
 379         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 380
 381 #ifdef CONFIG_QUOTA
 382         /* Turn quotas off */
 383         reiserfs_write_unlock(s);
 384         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 385                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 386                         dquot_quota_off(s, i);
 387         }
 388         reiserfs_write_lock(s);
 389         if (ms_active_set)
 390                 /* Restore the flag back */
 391                 s->s_flags &= ~MS_ACTIVE;
 392 #endif
 393         pathrelse(&path);
 394         if (done)
 395                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 396                               "Completed\n", done);
 397         return retval;
 398 }
 399
 400 /*
 401  * to protect file being unlinked from getting lost we "safe" link files
 402  * being unlinked. This link will be deleted in the same transaction with last
 403  * item of file. mounting the filesystem we scan all these links and remove
 404  * files which almost got lost
 405  */
 406 void add_save_link(struct reiserfs_transaction_handle *th,
 407                    struct inode *inode, int truncate)
 408 {
 409         INITIALIZE_PATH(path);
 410         int retval;
 411         struct cpu_key key;
 412         struct item_head ih;
 413         __le32 link;
 414
 415         BUG_ON(!th->t_trans_id);
 416
 417         /* file can only get one "save link" of each kind */
 418         RFALSE(truncate &&
 419                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 420                "saved link already exists for truncated inode %lx",
 421                (long)inode->i_ino);
 422         RFALSE(!truncate &&
 423                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 424                "saved link already exists for unlinked inode %lx",
 425                (long)inode->i_ino);
 426
 427         /* setup key of "save" link */
 428         key.version = KEY_FORMAT_3_5;
 429         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 430         key.on_disk_key.k_objectid = inode->i_ino;
 431         if (!truncate) {
 432                 /* unlink, rmdir, rename */
 433                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 434                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 435
 436                 /* item head of "safe" link */
 437                 make_le_item_head(&ih, &key, key.version,
 438                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 439                                   4 /*length */ , 0xffff /*free space */ );
 440         } else {
 441                 /* truncate */
 442                 if (S_ISDIR(inode->i_mode))
 443                         reiserfs_warning(inode->i_sb, "green-2102",
 444                                          "Adding a truncate savelink for "
 445                                          "a directory %k! Please report",
 446                                          INODE_PKEY(inode));
 447                 set_cpu_key_k_offset(&key, 1);
 448                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 449
 450                 /* item head of "safe" link */
 451                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 452                                   4 /*length */ , 0 /*free space */ );
 453         }
 454         key.key_length = 3;
 455
 456         /* look for its place in the tree */
 457         retval = search_item(inode->i_sb, &key, &path);
 458         if (retval != ITEM_NOT_FOUND) {
 459                 if (retval != -ENOSPC)
 460                         reiserfs_error(inode->i_sb, "vs-2100",
 461                                        "search_by_key (%K) returned %d", &key,
 462                                        retval);
 463                 pathrelse(&path);
 464                 return;
 465         }
 466
 467         /* body of "save" link */
 468         link = INODE_PKEY(inode)->k_dir_id;
 469
 470         /* put "save" link into tree, don't charge quota to anyone */
 471         retval =
 472             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 473         if (retval) {
 474                 if (retval != -ENOSPC)
 475                         reiserfs_error(inode->i_sb, "vs-2120",
 476                                        "insert_item returned %d", retval);
 477         } else {
 478                 if (truncate)
 479                         REISERFS_I(inode)->i_flags |=
 480                             i_link_saved_truncate_mask;
 481                 else
 482                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 483         }
 484 }
 485
 486 /* this opens transaction unlike add_save_link */
 487 int remove_save_link(struct inode *inode, int truncate)
 488 {
 489         struct reiserfs_transaction_handle th;
 490         struct reiserfs_key key;
 491         int err;
 492
 493         /* we are going to do one balancing only */
 494         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 495         if (err)
 496                 return err;
 497
 498         /* setup key of "save" link */
 499         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 500         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 501         if (!truncate) {
 502                 /* unlink, rmdir, rename */
 503                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 504                                     1 + inode->i_sb->s_blocksize);
 505                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 506         } else {
 507                 /* truncate */
 508                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 509                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 510         }
 511
 512         if ((truncate &&
 513              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 514             (!truncate &&
 515              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 516                 /* don't take quota bytes from anywhere */
 517                 reiserfs_delete_solid_item(&th, NULL, &key);
 518         if (!truncate) {
 519                 reiserfs_release_objectid(&th, inode->i_ino);
 520                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 521         } else
 522                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 523
 524         return journal_end(&th);
 525 }
 526
 527 static void reiserfs_kill_sb(struct super_block *s)
 528 {
 529         if (REISERFS_SB(s)) {
 530                 reiserfs_proc_info_done(s);
 531                 /*
 532                  * Force any pending inode evictions to occur now. Any
 533                  * inodes to be removed that have extended attributes
 534                  * associated with them need to clean them up before
 535                  * we can release the extended attribute root dentries.
 536                  * shrink_dcache_for_umount will BUG if we don't release
 537                  * those before it's called so ->put_super is too late.
 538                  */
 539                 shrink_dcache_sb(s);
 540
 541                 dput(REISERFS_SB(s)->xattr_root);
 542                 REISERFS_SB(s)->xattr_root = NULL;
 543                 dput(REISERFS_SB(s)->priv_root);
 544                 REISERFS_SB(s)->priv_root = NULL;
 545         }
 546
 547         kill_block_super(s);
 548 }
 549
 550 static void reiserfs_put_super(struct super_block *s)
 551 {
 552         struct reiserfs_transaction_handle th;
 553         th.t_trans_id = 0;
 554
 555         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 556
 557         reiserfs_write_lock(s);
 558
 559         /*
 560          * change file system state to current state if it was mounted
 561          * with read-write permissions
 562          */
 563         if (!(s->s_flags & MS_RDONLY)) {
 564                 if (!journal_begin(&th, s, 10)) {
 565                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 566                                                      1);
 567                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 568                                             REISERFS_SB(s)->s_mount_state);
 569                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 570                 }
 571         }
 572
 573         /*
 574          * note, journal_release checks for readonly mount, and can
 575          * decide not to do a journal_end
 576          */
 577         journal_release(&th, s);
 578
 579         reiserfs_free_bitmap_cache(s);
 580
 581         brelse(SB_BUFFER_WITH_SB(s));
 582
 583         print_statistics(s);
 584
 585         if (REISERFS_SB(s)->reserved_blocks != 0) {
 586                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 587                                  REISERFS_SB(s)->reserved_blocks);
 588         }
 589
 590         reiserfs_write_unlock(s);
 591         mutex_destroy(&REISERFS_SB(s)->lock);
 592         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 593         kfree(s->s_fs_info);
 594         s->s_fs_info = NULL;
 595 }
 596
 597 static struct kmem_cache *reiserfs_inode_cachep;
 598
 599 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 600 {
 601         struct reiserfs_inode_info *ei;
 602         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 603         if (!ei)
 604                 return NULL;
 605         atomic_set(&ei->openers, 0);
 606         mutex_init(&ei->tailpack);
 607 #ifdef CONFIG_QUOTA
 608         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 609 #endif
 610
 611         return &ei->vfs_inode;
 612 }
 613
 614 static void reiserfs_i_callback(struct rcu_head *head)
 615 {
 616         struct inode *inode = container_of(head, struct inode, i_rcu);
 617         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 618 }
 619
 620 static void reiserfs_destroy_inode(struct inode *inode)
 621 {
 622         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 623 }
 624
 625 static void init_once(void *foo)
 626 {
 627         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 628
 629         INIT_LIST_HEAD(&ei->i_prealloc_list);
 630         inode_init_once(&ei->vfs_inode);
 631 }
 632
 633 static int __init init_inodecache(void)
 634 {
 635         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 636                                                   sizeof(struct
 637                                                          reiserfs_inode_info),
 638                                                   0, (SLAB_RECLAIM_ACCOUNT|
 639                                                         SLAB_MEM_SPREAD),
 640                                                   init_once);
 641         if (reiserfs_inode_cachep == NULL)
 642                 return -ENOMEM;
 643         return 0;
 644 }
 645
 646 static void destroy_inodecache(void)
 647 {
 648         /*
 649          * Make sure all delayed rcu free inodes are flushed before we
 650          * destroy cache.
 651          */
 652         rcu_barrier();
 653         kmem_cache_destroy(reiserfs_inode_cachep);
 654 }
 655
 656 /* we don't mark inodes dirty, we just log them */
 657 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 658 {
 659         struct reiserfs_transaction_handle th;
 660
 661         int err = 0;
 662
 663         if (inode->i_sb->s_flags & MS_RDONLY) {
 664                 reiserfs_warning(inode->i_sb, "clm-6006",
 665                                  "writing inode %lu on readonly FS",
 666                                  inode->i_ino);
 667                 return;
 668         }
 669         reiserfs_write_lock(inode->i_sb);
 670
 671         /*
 672          * this is really only used for atime updates, so they don't have
 673          * to be included in O_SYNC or fsync
 674          */
 675         err = journal_begin(&th, inode->i_sb, 1);
 676         if (err)
 677                 goto out;
 678
 679         reiserfs_update_sd(&th, inode);
 680         journal_end(&th);
 681
 682 out:
 683         reiserfs_write_unlock(inode->i_sb);
 684 }
 685
 686 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 687 {
 688         struct super_block *s = root->d_sb;
 689         struct reiserfs_journal *journal = SB_JOURNAL(s);
 690         long opts = REISERFS_SB(s)->s_mount_opt;
 691
 692         if (opts & (1 << REISERFS_LARGETAIL))
 693                 seq_puts(seq, ",tails=on");
 694         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 695                 seq_puts(seq, ",notail");
 696         /* tails=small is default so we don't show it */
 697
 698         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 699                 seq_puts(seq, ",barrier=none");
 700         /* barrier=flush is default so we don't show it */
 701
 702         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 703                 seq_puts(seq, ",errors=continue");
 704         else if (opts & (1 << REISERFS_ERROR_PANIC))
 705                 seq_puts(seq, ",errors=panic");
 706         /* errors=ro is default so we don't show it */
 707
 708         if (opts & (1 << REISERFS_DATA_LOG))
 709                 seq_puts(seq, ",data=journal");
 710         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 711                 seq_puts(seq, ",data=writeback");
 712         /* data=ordered is default so we don't show it */
 713
 714         if (opts & (1 << REISERFS_ATTRS))
 715                 seq_puts(seq, ",attrs");
 716
 717         if (opts & (1 << REISERFS_XATTRS_USER))
 718                 seq_puts(seq, ",user_xattr");
 719
 720         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 721                 seq_puts(seq, ",expose_privroot");
 722
 723         if (opts & (1 << REISERFS_POSIXACL))
 724                 seq_puts(seq, ",acl");
 725
 726         if (REISERFS_SB(s)->s_jdev)
 727                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 728
 729         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 730                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 731
 732 #ifdef CONFIG_QUOTA
 733         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 734                 seq_show_option(seq, "usrjquota",
 735                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 736         else if (opts & (1 << REISERFS_USRQUOTA))
 737                 seq_puts(seq, ",usrquota");
 738         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 739                 seq_show_option(seq, "grpjquota",
 740                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 741         else if (opts & (1 << REISERFS_GRPQUOTA))
 742                 seq_puts(seq, ",grpquota");
 743         if (REISERFS_SB(s)->s_jquota_fmt) {
 744                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 745                         seq_puts(seq, ",jqfmt=vfsold");
 746                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 747                         seq_puts(seq, ",jqfmt=vfsv0");
 748         }
 749 #endif
 750
 751         /* Block allocator options */
 752         if (opts & (1 << REISERFS_NO_BORDER))
 753                 seq_puts(seq, ",block-allocator=noborder");
 754         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 755                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 756         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 757                 seq_puts(seq, ",block-allocator=hashed_relocation");
 758         if (opts & (1 << REISERFS_TEST4))
 759                 seq_puts(seq, ",block-allocator=test4");
 760         show_alloc_options(seq, s);
 761         return 0;
 762 }
 763
 764 #ifdef CONFIG_QUOTA
 765 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 766                                     size_t, loff_t);
 767 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 768                                    loff_t);
 769
 770 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 771 {
 772         return REISERFS_I(inode)->i_dquot;
 773 }
 774 #endif
 775
 776 static const struct super_operations reiserfs_sops = {
 777         .alloc_inode = reiserfs_alloc_inode,
 778         .destroy_inode = reiserfs_destroy_inode,
 779         .write_inode = reiserfs_write_inode,
 780         .dirty_inode = reiserfs_dirty_inode,
 781         .evict_inode = reiserfs_evict_inode,
 782         .put_super = reiserfs_put_super,
 783         .sync_fs = reiserfs_sync_fs,
 784         .freeze_fs = reiserfs_freeze,
 785         .unfreeze_fs = reiserfs_unfreeze,
 786         .statfs = reiserfs_statfs,
 787         .remount_fs = reiserfs_remount,
 788         .show_options = reiserfs_show_options,
 789 #ifdef CONFIG_QUOTA
 790         .quota_read = reiserfs_quota_read,
 791         .quota_write = reiserfs_quota_write,
 792         .get_dquots = reiserfs_get_dquots,
 793 #endif
 794 };
 795
 796 #ifdef CONFIG_QUOTA
 797 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 798
 799 static int reiserfs_write_dquot(struct dquot *);
 800 static int reiserfs_acquire_dquot(struct dquot *);
 801 static int reiserfs_release_dquot(struct dquot *);
 802 static int reiserfs_mark_dquot_dirty(struct dquot *);
 803 static int reiserfs_write_info(struct super_block *, int);
 804 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 805
 806 static const struct dquot_operations reiserfs_quota_operations = {
 807         .write_dquot = reiserfs_write_dquot,
 808         .acquire_dquot = reiserfs_acquire_dquot,
 809         .release_dquot = reiserfs_release_dquot,
 810         .mark_dirty = reiserfs_mark_dquot_dirty,
 811         .write_info = reiserfs_write_info,
 812         .alloc_dquot    = dquot_alloc,
 813         .destroy_dquot  = dquot_destroy,
 814 };
 815
 816 static const struct quotactl_ops reiserfs_qctl_operations = {
 817         .quota_on = reiserfs_quota_on,
 818         .quota_off = dquot_quota_off,
 819         .quota_sync = dquot_quota_sync,
 820         .get_state = dquot_get_state,
 821         .set_info = dquot_set_dqinfo,
 822         .get_dqblk = dquot_get_dqblk,
 823         .set_dqblk = dquot_set_dqblk,
 824 };
 825 #endif
 826
 827 static const struct export_operations reiserfs_export_ops = {
 828         .encode_fh = reiserfs_encode_fh,
 829         .fh_to_dentry = reiserfs_fh_to_dentry,
 830         .fh_to_parent = reiserfs_fh_to_parent,
 831         .get_parent = reiserfs_get_parent,
 832 };
 833
 834 /*
 835  * this struct is used in reiserfs_getopt () for containing the value for
 836  * those mount options that have values rather than being toggles.
 837  */
 838 typedef struct {
 839         char *value;
 840         /*
 841          * bitmask which is to set on mount_options bitmask
 842          * when this value is found, 0 is no bits are to be changed.
 843          */
 844         int setmask;
 845         /*
 846          * bitmask which is to clear on mount_options bitmask
 847          * when this value is found, 0 is no bits are to be changed.
 848          * This is applied BEFORE setmask
 849          */
 850         int clrmask;
 851 } arg_desc_t;
 852
 853 /* Set this bit in arg_required to allow empty arguments */
 854 #define REISERFS_OPT_ALLOWEMPTY 31
 855
 856 /*
 857  * this struct is used in reiserfs_getopt() for describing the
 858  * set of reiserfs mount options
 859  */
 860 typedef struct {
 861         char *option_name;
 862
 863         /* 0 if argument is not required, not 0 otherwise */
 864         int arg_required;
 865
 866         /* list of values accepted by an option */
 867         const arg_desc_t *values;
 868
 869         /*
 870          * bitmask which is to set on mount_options bitmask
 871          * when this value is found, 0 is no bits are to be changed.
 872          */
 873         int setmask;
 874
 875         /*
 876          * bitmask which is to clear on mount_options bitmask
 877          * when this value is found, 0 is no bits are to be changed.
 878          * This is applied BEFORE setmask
 879          */
 880         int clrmask;
 881 } opt_desc_t;
 882
 883 /* possible values for -o data= */
 884 static const arg_desc_t logging_mode[] = {
 885         {"ordered", 1 << REISERFS_DATA_ORDERED,
 886          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 887         {"journal", 1 << REISERFS_DATA_LOG,
 888          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 889         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 890          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 891         {.value = NULL}
 892 };
 893
 894 /* possible values for -o barrier= */
 895 static const arg_desc_t barrier_mode[] = {
 896         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 897         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 898         {.value = NULL}
 899 };
 900
 901 /*
 902  * possible values for "-o block-allocator=" and bits which are to be set in
 903  * s_mount_opt of reiserfs specific part of in-core super block
 904  */
 905 static const arg_desc_t balloc[] = {
 906         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 907         {"border", 0, 1 << REISERFS_NO_BORDER},
 908         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 909         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 910         {"test4", 1 << REISERFS_TEST4, 0},
 911         {"notest4", 0, 1 << REISERFS_TEST4},
 912         {NULL, 0, 0}
 913 };
 914
 915 static const arg_desc_t tails[] = {
 916         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 917         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 918         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 919         {NULL, 0, 0}
 920 };
 921
 922 static const arg_desc_t error_actions[] = {
 923         {"panic", 1 << REISERFS_ERROR_PANIC,
 924          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 925         {"ro-remount", 1 << REISERFS_ERROR_RO,
 926          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 927 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 928         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 929          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 930 #endif
 931         {NULL, 0, 0},
 932 };
 933
 934 /*
 935  * proceed only one option from a list *cur - string containing of mount
 936  * options
 937  * opts - array of options which are accepted
 938  * opt_arg - if option is found and requires an argument and if it is specifed
 939  * in the input - pointer to the argument is stored here
 940  * bit_flags - if option requires to set a certain bit - it is set here
 941  * return -1 if unknown option is found, opt->arg_required otherwise
 942  */
 943 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 944                            char **opt_arg, unsigned long *bit_flags)
 945 {
 946         char *p;
 947         /*
 948          * foo=bar,
 949          * ^   ^  ^
 950          * |   |  +-- option_end
 951          * |   +-- arg_start
 952          * +-- option_start
 953          */
 954         const opt_desc_t *opt;
 955         const arg_desc_t *arg;
 956
 957         p = *cur;
 958
 959         /* assume argument cannot contain commas */
 960         *cur = strchr(p, ',');
 961         if (*cur) {
 962                 *(*cur) = '\0';
 963                 (*cur)++;
 964         }
 965
 966         if (!strncmp(p, "alloc=", 6)) {
 967                 /*
 968                  * Ugly special case, probably we should redo options
 969                  * parser so that it can understand several arguments for
 970                  * some options, also so that it can fill several bitfields
 971                  * with option values.
 972                  */
 973                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 974                         return -1;
 975                 } else {
 976                         return 0;
 977                 }
 978         }
 979
 980         /* for every option in the list */
 981         for (opt = opts; opt->option_name; opt++) {
 982                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 983                         if (bit_flags) {
 984                                 if (opt->clrmask ==
 985                                     (1 << REISERFS_UNSUPPORTED_OPT))
 986                                         reiserfs_warning(s, "super-6500",
 987                                                          "%s not supported.\n",
 988                                                          p);
 989                                 else
 990                                         *bit_flags &= ~opt->clrmask;
 991                                 if (opt->setmask ==
 992                                     (1 << REISERFS_UNSUPPORTED_OPT))
 993                                         reiserfs_warning(s, "super-6501",
 994                                                          "%s not supported.\n",
 995                                                          p);
 996                                 else
 997                                         *bit_flags |= opt->setmask;
 998                         }
 999                         break;
1000                 }
1001         }
1002         if (!opt->option_name) {
1003                 reiserfs_warning(s, "super-6502",
1004                                  "unknown mount option \"%s\"", p);
1005                 return -1;
1006         }
1007
1008         p += strlen(opt->option_name);
1009         switch (*p) {
1010         case '=':
1011                 if (!opt->arg_required) {
1012                         reiserfs_warning(s, "super-6503",
1013                                          "the option \"%s\" does not "
1014                                          "require an argument\n",
1015                                          opt->option_name);
1016                         return -1;
1017                 }
1018                 break;
1019
1020         case 0:
1021                 if (opt->arg_required) {
1022                         reiserfs_warning(s, "super-6504",
1023                                          "the option \"%s\" requires an "
1024                                          "argument\n", opt->option_name);
1025                         return -1;
1026                 }
1027                 break;
1028         default:
1029                 reiserfs_warning(s, "super-6505",
1030                                  "head of option \"%s\" is only correct\n",
1031                                  opt->option_name);
1032                 return -1;
1033         }
1034
1035         /*
1036          * move to the argument, or to next option if argument is not
1037          * required
1038          */
1039         p++;
1040
1041         if (opt->arg_required
1042             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1043             && !strlen(p)) {
1044                 /* this catches "option=," if not allowed */
1045                 reiserfs_warning(s, "super-6506",
1046                                  "empty argument for \"%s\"\n",
1047                                  opt->option_name);
1048                 return -1;
1049         }
1050
1051         if (!opt->values) {
1052                 /* *=NULLopt_arg contains pointer to argument */
1053                 *opt_arg = p;
1054                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1055         }
1056
1057         /* values possible for this option are listed in opt->values */
1058         for (arg = opt->values; arg->value; arg++) {
1059                 if (!strcmp(p, arg->value)) {
1060                         if (bit_flags) {
1061                                 *bit_flags &= ~arg->clrmask;
1062                                 *bit_flags |= arg->setmask;
1063                         }
1064                         return opt->arg_required;
1065                 }
1066         }
1067
1068         reiserfs_warning(s, "super-6506",
1069                          "bad value \"%s\" for option \"%s\"\n", p,
1070                          opt->option_name);
1071         return -1;
1072 }
1073
1074 /* returns 0 if something is wrong in option string, 1 - otherwise */
1075 static int reiserfs_parse_options(struct super_block *s,
1076
1077                                   /* string given via mount's -o */
1078                                   char *options,
1079
1080                                   /*
1081                                    * after the parsing phase, contains the
1082                                    * collection of bitflags defining what
1083                                    * mount options were selected.
1084                                    */
1085                                   unsigned long *mount_options,
1086
1087                                   /* strtol-ed from NNN of resize=NNN */
1088                                   unsigned long *blocks,
1089                                   char **jdev_name,
1090                                   unsigned int *commit_max_age,
1091                                   char **qf_names,
1092                                   unsigned int *qfmt)
1093 {
1094         int c;
1095         char *arg = NULL;
1096         char *pos;
1097         opt_desc_t opts[] = {
1098                 /*
1099                  * Compatibility stuff, so that -o notail for old
1100                  * setups still work
1101                  */
1102                 {"tails",.arg_required = 't',.values = tails},
1103                 {"notail",.clrmask =
1104                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1105                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1106                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1107                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1108                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1109 #ifdef CONFIG_REISERFS_FS_XATTR
1110                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1111                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1112 #else
1113                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1114                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1115 #endif
1116 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1117                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1118                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1119 #else
1120                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1121                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1122 #endif
1123                 {.option_name = "nolog"},
1124                 {"replayonly",.setmask = 1 << REPLAYONLY},
1125                 {"block-allocator",.arg_required = 'a',.values = balloc},
1126                 {"data",.arg_required = 'd',.values = logging_mode},
1127                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1128                 {"resize",.arg_required = 'r',.values = NULL},
1129                 {"jdev",.arg_required = 'j',.values = NULL},
1130                 {"nolargeio",.arg_required = 'w',.values = NULL},
1131                 {"commit",.arg_required = 'c',.values = NULL},
1132                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1133                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1134                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1135                 {"errors",.arg_required = 'e',.values = error_actions},
1136                 {"usrjquota",.arg_required =
1137                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1138                 {"grpjquota",.arg_required =
1139                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1140                 {"jqfmt",.arg_required = 'f',.values = NULL},
1141                 {.option_name = NULL}
1142         };
1143
1144         *blocks = 0;
1145         if (!options || !*options)
1146                 /*
1147                  * use default configuration: create tails, journaling on, no
1148                  * conversion to newest format
1149                  */
1150                 return 1;
1151
1152         for (pos = options; pos;) {
1153                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1154                 if (c == -1)
1155                         /* wrong option is given */
1156                         return 0;
1157
1158                 if (c == 'r') {
1159                         char *p;
1160
1161                         p = NULL;
1162                         /* "resize=NNN" or "resize=auto" */
1163
1164                         if (!strcmp(arg, "auto")) {
1165                                 /* From JFS code, to auto-get the size. */
1166                                 *blocks =
1167                                     s->s_bdev->bd_inode->i_size >> s->
1168                                     s_blocksize_bits;
1169                         } else {
1170                                 *blocks = simple_strtoul(arg, &p, 0);
1171                                 if (*p != '\0') {
1172                                         /* NNN does not look like a number */
1173                                         reiserfs_warning(s, "super-6507",
1174                                                          "bad value %s for "
1175                                                          "-oresize\n", arg);
1176                                         return 0;
1177                                 }
1178                         }
1179                 }
1180
1181                 if (c == 'c') {
1182                         char *p = NULL;
1183                         unsigned long val = simple_strtoul(arg, &p, 0);
1184                         /* commit=NNN (time in seconds) */
1185                         if (*p != '\0' || val >= (unsigned int)-1) {
1186                                 reiserfs_warning(s, "super-6508",
1187                                                  "bad value %s for -ocommit\n",
1188                                                  arg);
1189                                 return 0;
1190                         }
1191                         *commit_max_age = (unsigned int)val;
1192                 }
1193
1194                 if (c == 'w') {
1195                         reiserfs_warning(s, "super-6509", "nolargeio option "
1196                                          "is no longer supported");
1197                         return 0;
1198                 }
1199
1200                 if (c == 'j') {
1201                         if (arg && *arg && jdev_name) {
1202                                 /* Hm, already assigned? */
1203                                 if (*jdev_name) {
1204                                         reiserfs_warning(s, "super-6510",
1205                                                          "journal device was "
1206                                                          "already specified to "
1207                                                          "be %s", *jdev_name);
1208                                         return 0;
1209                                 }
1210                                 *jdev_name = arg;
1211                         }
1212                 }
1213 #ifdef CONFIG_QUOTA
1214                 if (c == 'u' || c == 'g') {
1215                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1216
1217                         if (sb_any_quota_loaded(s) &&
1218                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1219                                 reiserfs_warning(s, "super-6511",
1220                                                  "cannot change journaled "
1221                                                  "quota options when quota "
1222                                                  "turned on.");
1223                                 return 0;
1224                         }
1225                         if (*arg) {     /* Some filename specified? */
1226                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1227                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1228                                               arg)) {
1229                                         reiserfs_warning(s, "super-6512",
1230                                                          "%s quota file "
1231                                                          "already specified.",
1232                                                          QTYPE2NAME(qtype));
1233                                         return 0;
1234                                 }
1235                                 if (strchr(arg, '/')) {
1236                                         reiserfs_warning(s, "super-6513",
1237                                                          "quotafile must be "
1238                                                          "on filesystem root.");
1239                                         return 0;
1240                                 }
1241                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1242                                 if (!qf_names[qtype]) {
1243                                         reiserfs_warning(s, "reiserfs-2502",
1244                                                          "not enough memory "
1245                                                          "for storing "
1246                                                          "quotafile name.");
1247                                         return 0;
1248                                 }
1249                                 if (qtype == USRQUOTA)
1250                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1251                                 else
1252                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1253                         } else {
1254                                 if (qf_names[qtype] !=
1255                                     REISERFS_SB(s)->s_qf_names[qtype])
1256                                         kfree(qf_names[qtype]);
1257                                 qf_names[qtype] = NULL;
1258                                 if (qtype == USRQUOTA)
1259                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1260                                 else
1261                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1262                         }
1263                 }
1264                 if (c == 'f') {
1265                         if (!strcmp(arg, "vfsold"))
1266                                 *qfmt = QFMT_VFS_OLD;
1267                         else if (!strcmp(arg, "vfsv0"))
1268                                 *qfmt = QFMT_VFS_V0;
1269                         else {
1270                                 reiserfs_warning(s, "super-6514",
1271                                                  "unknown quota format "
1272                                                  "specified.");
1273                                 return 0;
1274                         }
1275                         if (sb_any_quota_loaded(s) &&
1276                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1277                                 reiserfs_warning(s, "super-6515",
1278                                                  "cannot change journaled "
1279                                                  "quota options when quota "
1280                                                  "turned on.");
1281                                 return 0;
1282                         }
1283                 }
1284 #else
1285                 if (c == 'u' || c == 'g' || c == 'f') {
1286                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1287                                          "quota options not supported.");
1288                         return 0;
1289                 }
1290 #endif
1291         }
1292
1293 #ifdef CONFIG_QUOTA
1294         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1295             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1296                 reiserfs_warning(s, "super-6515",
1297                                  "journaled quota format not specified.");
1298                 return 0;
1299         }
1300         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1301                sb_has_quota_loaded(s, USRQUOTA)) ||
1302             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1303                sb_has_quota_loaded(s, GRPQUOTA))) {
1304                 reiserfs_warning(s, "super-6516", "quota options must "
1305                                  "be present when quota is turned on.");
1306                 return 0;
1307         }
1308 #endif
1309
1310         return 1;
1311 }
1312
1313 static void switch_data_mode(struct super_block *s, unsigned long mode)
1314 {
1315         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1316                                          (1 << REISERFS_DATA_ORDERED) |
1317                                          (1 << REISERFS_DATA_WRITEBACK));
1318         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1319 }
1320
1321 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1322 {
1323         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1324                 if (!reiserfs_data_log(s)) {
1325                         switch_data_mode(s, REISERFS_DATA_LOG);
1326                         reiserfs_info(s, "switching to journaled data mode\n");
1327                 }
1328         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1329                 if (!reiserfs_data_ordered(s)) {
1330                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1331                         reiserfs_info(s, "switching to ordered data mode\n");
1332                 }
1333         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1334                 if (!reiserfs_data_writeback(s)) {
1335                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1336                         reiserfs_info(s, "switching to writeback data mode\n");
1337                 }
1338         }
1339 }
1340
1341 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1342 {
1343         int flush = (1 << REISERFS_BARRIER_FLUSH);
1344         int none = (1 << REISERFS_BARRIER_NONE);
1345         int all_barrier = flush | none;
1346
1347         if (bits & all_barrier) {
1348                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1349                 if (bits & flush) {
1350                         REISERFS_SB(s)->s_mount_opt |= flush;
1351                         printk("reiserfs: enabling write barrier flush mode\n");
1352                 } else if (bits & none) {
1353                         REISERFS_SB(s)->s_mount_opt |= none;
1354                         printk("reiserfs: write barriers turned off\n");
1355                 }
1356         }
1357 }
1358
1359 static void handle_attrs(struct super_block *s)
1360 {
1361         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1362
1363         if (reiserfs_attrs(s)) {
1364                 if (old_format_only(s)) {
1365                         reiserfs_warning(s, "super-6517", "cannot support "
1366                                          "attributes on 3.5.x disk format");
1367                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1368                         return;
1369                 }
1370                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1371                         reiserfs_warning(s, "super-6518", "cannot support "
1372                                          "attributes until flag is set in "
1373                                          "super-block");
1374                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1375                 }
1376         }
1377 }
1378
1379 #ifdef CONFIG_QUOTA
1380 static void handle_quota_files(struct super_block *s, char **qf_names,
1381                                unsigned int *qfmt)
1382 {
1383         int i;
1384
1385         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1386                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1387                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1388                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1389         }
1390         if (*qfmt)
1391                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1392 }
1393 #endif
1394
1395 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1396 {
1397         struct reiserfs_super_block *rs;
1398         struct reiserfs_transaction_handle th;
1399         unsigned long blocks;
1400         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1401         unsigned long safe_mask = 0;
1402         unsigned int commit_max_age = (unsigned int)-1;
1403         struct reiserfs_journal *journal = SB_JOURNAL(s);
1404         char *new_opts = kstrdup(arg, GFP_KERNEL);
1405         int err;
1406         char *qf_names[REISERFS_MAXQUOTAS];
1407         unsigned int qfmt = 0;
1408 #ifdef CONFIG_QUOTA
1409         int i;
1410 #endif
1411
1412         sync_filesystem(s);
1413         reiserfs_write_lock(s);
1414
1415 #ifdef CONFIG_QUOTA
1416         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1417 #endif
1418
1419         rs = SB_DISK_SUPER_BLOCK(s);
1420
1421         if (!reiserfs_parse_options
1422             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1423             qf_names, &qfmt)) {
1424 #ifdef CONFIG_QUOTA
1425                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1426                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1427                                 kfree(qf_names[i]);
1428 #endif
1429                 err = -EINVAL;
1430                 goto out_err_unlock;
1431         }
1432 #ifdef CONFIG_QUOTA
1433         handle_quota_files(s, qf_names, &qfmt);
1434 #endif
1435
1436         handle_attrs(s);
1437
1438         /* Add options that are safe here */
1439         safe_mask |= 1 << REISERFS_SMALLTAIL;
1440         safe_mask |= 1 << REISERFS_LARGETAIL;
1441         safe_mask |= 1 << REISERFS_NO_BORDER;
1442         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1443         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1444         safe_mask |= 1 << REISERFS_TEST4;
1445         safe_mask |= 1 << REISERFS_ATTRS;
1446         safe_mask |= 1 << REISERFS_XATTRS_USER;
1447         safe_mask |= 1 << REISERFS_POSIXACL;
1448         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1449         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1450         safe_mask |= 1 << REISERFS_ERROR_RO;
1451         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1452         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1453         safe_mask |= 1 << REISERFS_USRQUOTA;
1454         safe_mask |= 1 << REISERFS_GRPQUOTA;
1455
1456         /*
1457          * Update the bitmask, taking care to keep
1458          * the bits we're not allowed to change here
1459          */
1460         REISERFS_SB(s)->s_mount_opt =
1461             (REISERFS_SB(s)->
1462              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1463
1464         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1465                 journal->j_max_commit_age = commit_max_age;
1466                 journal->j_max_trans_age = commit_max_age;
1467         } else if (commit_max_age == 0) {
1468                 /* 0 means restore defaults. */
1469                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1470                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1471         }
1472
1473         if (blocks) {
1474                 err = reiserfs_resize(s, blocks);
1475                 if (err != 0)
1476                         goto out_err_unlock;
1477         }
1478
1479         if (*mount_flags & MS_RDONLY) {
1480                 reiserfs_write_unlock(s);
1481                 reiserfs_xattr_init(s, *mount_flags);
1482                 /* remount read-only */
1483                 if (s->s_flags & MS_RDONLY)
1484                         /* it is read-only already */
1485                         goto out_ok_unlocked;
1486
1487                 err = dquot_suspend(s, -1);
1488                 if (err < 0)
1489                         goto out_err;
1490
1491                 /* try to remount file system with read-only permissions */
1492                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1493                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1494                         goto out_ok_unlocked;
1495                 }
1496
1497                 reiserfs_write_lock(s);
1498
1499                 err = journal_begin(&th, s, 10);
1500                 if (err)
1501                         goto out_err_unlock;
1502
1503                 /* Mounting a rw partition read-only. */
1504                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1505                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1506                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1507         } else {
1508                 /* remount read-write */
1509                 if (!(s->s_flags & MS_RDONLY)) {
1510                         reiserfs_write_unlock(s);
1511                         reiserfs_xattr_init(s, *mount_flags);
1512                         goto out_ok_unlocked;   /* We are read-write already */
1513                 }
1514
1515                 if (reiserfs_is_journal_aborted(journal)) {
1516                         err = journal->j_errno;
1517                         goto out_err_unlock;
1518                 }
1519
1520                 handle_data_mode(s, mount_options);
1521                 handle_barrier_mode(s, mount_options);
1522                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1523
1524                 /* now it is safe to call journal_begin */
1525                 s->s_flags &= ~MS_RDONLY;
1526                 err = journal_begin(&th, s, 10);
1527                 if (err)
1528                         goto out_err_unlock;
1529
1530                 /* Mount a partition which is read-only, read-write */
1531                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1532                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1533                 s->s_flags &= ~MS_RDONLY;
1534                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1535                 if (!old_format_only(s))
1536                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1537                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1538                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1539                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1540         }
1541         /* this will force a full flush of all journal lists */
1542         SB_JOURNAL(s)->j_must_wait = 1;
1543         err = journal_end(&th);
1544         if (err)
1545                 goto out_err_unlock;
1546
1547         reiserfs_write_unlock(s);
1548         if (!(*mount_flags & MS_RDONLY)) {
1549                 dquot_resume(s, -1);
1550                 reiserfs_write_lock(s);
1551                 finish_unfinished(s);
1552                 reiserfs_write_unlock(s);
1553                 reiserfs_xattr_init(s, *mount_flags);
1554         }
1555
1556 out_ok_unlocked:
1557         replace_mount_options(s, new_opts);
1558         return 0;
1559
1560 out_err_unlock:
1561         reiserfs_write_unlock(s);
1562 out_err:
1563         kfree(new_opts);
1564         return err;
1565 }
1566
1567 static int read_super_block(struct super_block *s, int offset)
1568 {
1569         struct buffer_head *bh;
1570         struct reiserfs_super_block *rs;
1571         int fs_blocksize;
1572
1573         bh = sb_bread(s, offset / s->s_blocksize);
1574         if (!bh) {
1575                 reiserfs_warning(s, "sh-2006",
1576                                  "bread failed (dev %s, block %lu, size %lu)",
1577                                  s->s_id, offset / s->s_blocksize,
1578                                  s->s_blocksize);
1579                 return 1;
1580         }
1581
1582         rs = (struct reiserfs_super_block *)bh->b_data;
1583         if (!is_any_reiserfs_magic_string(rs)) {
1584                 brelse(bh);
1585                 return 1;
1586         }
1587         /*
1588          * ok, reiserfs signature (old or new) found in at the given offset
1589          */
1590         fs_blocksize = sb_blocksize(rs);
1591         brelse(bh);
1592         sb_set_blocksize(s, fs_blocksize);
1593
1594         bh = sb_bread(s, offset / s->s_blocksize);
1595         if (!bh) {
1596                 reiserfs_warning(s, "sh-2007",
1597                                  "bread failed (dev %s, block %lu, size %lu)",
1598                                  s->s_id, offset / s->s_blocksize,
1599                                  s->s_blocksize);
1600                 return 1;
1601         }
1602
1603         rs = (struct reiserfs_super_block *)bh->b_data;
1604         if (sb_blocksize(rs) != s->s_blocksize) {
1605                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1606                                  "filesystem on (dev %s, block %llu, size %lu)",
1607                                  s->s_id,
1608                                  (unsigned long long)bh->b_blocknr,
1609                                  s->s_blocksize);
1610                 brelse(bh);
1611                 return 1;
1612         }
1613
1614         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1615                 brelse(bh);
1616                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1617                                  "--rebuild-tree run detected. Please run\n"
1618                                  "reiserfsck --rebuild-tree and wait for a "
1619                                  "completion. If that fails\n"
1620                                  "get newer reiserfsprogs package");
1621                 return 1;
1622         }
1623
1624         SB_BUFFER_WITH_SB(s) = bh;
1625         SB_DISK_SUPER_BLOCK(s) = rs;
1626
1627         /*
1628          * magic is of non-standard journal filesystem, look at s_version to
1629          * find which format is in use
1630          */
1631         if (is_reiserfs_jr(rs)) {
1632                 if (sb_version(rs) == REISERFS_VERSION_2)
1633                         reiserfs_info(s, "found reiserfs format \"3.6\""
1634                                       " with non-standard journal\n");
1635                 else if (sb_version(rs) == REISERFS_VERSION_1)
1636                         reiserfs_info(s, "found reiserfs format \"3.5\""
1637                                       " with non-standard journal\n");
1638                 else {
1639                         reiserfs_warning(s, "sh-2012", "found unknown "
1640                                          "format \"%u\" of reiserfs with "
1641                                          "non-standard magic", sb_version(rs));
1642                         return 1;
1643                 }
1644         } else
1645                 /*
1646                  * s_version of standard format may contain incorrect
1647                  * information, so we just look at the magic string
1648                  */
1649                 reiserfs_info(s,
1650                               "found reiserfs format \"%s\" with standard journal\n",
1651                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1652
1653         s->s_op = &reiserfs_sops;
1654         s->s_export_op = &reiserfs_export_ops;
1655 #ifdef CONFIG_QUOTA
1656         s->s_qcop = &reiserfs_qctl_operations;
1657         s->dq_op = &reiserfs_quota_operations;
1658         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1659 #endif
1660
1661         /*
1662          * new format is limited by the 32 bit wide i_blocks field, want to
1663          * be one full block below that.
1664          */
1665         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1666         return 0;
1667 }
1668
1669 /* after journal replay, reread all bitmap and super blocks */
1670 static int reread_meta_blocks(struct super_block *s)
1671 {
1672         ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1673         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1674         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1675                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1676                 return 1;
1677         }
1678
1679         return 0;
1680 }
1681
1682 /* hash detection stuff */
1683
1684 /*
1685  * if root directory is empty - we set default - Yura's - hash and
1686  * warn about it
1687  * FIXME: we look for only one name in a directory. If tea and yura
1688  * both have the same value - we ask user to send report to the
1689  * mailing list
1690  */
1691 static __u32 find_hash_out(struct super_block *s)
1692 {
1693         int retval;
1694         struct inode *inode;
1695         struct cpu_key key;
1696         INITIALIZE_PATH(path);
1697         struct reiserfs_dir_entry de;
1698         struct reiserfs_de_head *deh;
1699         __u32 hash = DEFAULT_HASH;
1700         __u32 deh_hashval, teahash, r5hash, yurahash;
1701
1702         inode = d_inode(s->s_root);
1703
1704         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1705         retval = search_by_entry_key(s, &key, &path, &de);
1706         if (retval == IO_ERROR) {
1707                 pathrelse(&path);
1708                 return UNSET_HASH;
1709         }
1710         if (retval == NAME_NOT_FOUND)
1711                 de.de_entry_num--;
1712
1713         set_de_name_and_namelen(&de);
1714         deh = de.de_deh + de.de_entry_num;
1715
1716         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1717                 /* allow override in this case */
1718                 if (reiserfs_rupasov_hash(s))
1719                         hash = YURA_HASH;
1720                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1721                 goto out;
1722         }
1723
1724         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1725         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1726         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1727         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1728
1729         if ((teahash == r5hash && deh_hashval == r5hash) ||
1730             (teahash == yurahash && deh_hashval == yurahash) ||
1731             (r5hash == yurahash && deh_hashval == yurahash)) {
1732                 reiserfs_warning(s, "reiserfs-2506",
1733                                  "Unable to automatically detect hash "
1734                                  "function. Please mount with -o "
1735                                  "hash={tea,rupasov,r5}");
1736                 hash = UNSET_HASH;
1737                 goto out;
1738         }
1739
1740         if (deh_hashval == yurahash)
1741                 hash = YURA_HASH;
1742         else if (deh_hashval == teahash)
1743                 hash = TEA_HASH;
1744         else if (deh_hashval == r5hash)
1745                 hash = R5_HASH;
1746         else {
1747                 reiserfs_warning(s, "reiserfs-2506",
1748                                  "Unrecognised hash function");
1749                 hash = UNSET_HASH;
1750         }
1751 out:
1752         pathrelse(&path);
1753         return hash;
1754 }
1755
1756 /* finds out which hash names are sorted with */
1757 static int what_hash(struct super_block *s)
1758 {
1759         __u32 code;
1760
1761         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1762
1763         /*
1764          * reiserfs_hash_detect() == true if any of the hash mount options
1765          * were used.  We must check them to make sure the user isn't
1766          * using a bad hash value
1767          */
1768         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1769                 code = find_hash_out(s);
1770
1771         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1772                 /*
1773                  * detection has found the hash, and we must check against the
1774                  * mount options
1775                  */
1776                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1777                         reiserfs_warning(s, "reiserfs-2507",
1778                                          "Error, %s hash detected, "
1779                                          "unable to force rupasov hash",
1780                                          reiserfs_hashname(code));
1781                         code = UNSET_HASH;
1782                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1783                         reiserfs_warning(s, "reiserfs-2508",
1784                                          "Error, %s hash detected, "
1785                                          "unable to force tea hash",
1786                                          reiserfs_hashname(code));
1787                         code = UNSET_HASH;
1788                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1789                         reiserfs_warning(s, "reiserfs-2509",
1790                                          "Error, %s hash detected, "
1791                                          "unable to force r5 hash",
1792                                          reiserfs_hashname(code));
1793                         code = UNSET_HASH;
1794                 }
1795         } else {
1796                 /*
1797                  * find_hash_out was not called or
1798                  * could not determine the hash
1799                  */
1800                 if (reiserfs_rupasov_hash(s)) {
1801                         code = YURA_HASH;
1802                 } else if (reiserfs_tea_hash(s)) {
1803                         code = TEA_HASH;
1804                 } else if (reiserfs_r5_hash(s)) {
1805                         code = R5_HASH;
1806                 }
1807         }
1808
1809         /*
1810          * if we are mounted RW, and we have a new valid hash code, update
1811          * the super
1812          */
1813         if (code != UNSET_HASH &&
1814             !(s->s_flags & MS_RDONLY) &&
1815             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1816                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1817         }
1818         return code;
1819 }
1820
1821 /* return pointer to appropriate function */
1822 static hashf_t hash_function(struct super_block *s)
1823 {
1824         switch (what_hash(s)) {
1825         case TEA_HASH:
1826                 reiserfs_info(s, "Using tea hash to sort names\n");
1827                 return keyed_hash;
1828         case YURA_HASH:
1829                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1830                 return yura_hash;
1831         case R5_HASH:
1832                 reiserfs_info(s, "Using r5 hash to sort names\n");
1833                 return r5_hash;
1834         }
1835         return NULL;
1836 }
1837
1838 /* this is used to set up correct value for old partitions */
1839 static int function2code(hashf_t func)
1840 {
1841         if (func == keyed_hash)
1842                 return TEA_HASH;
1843         if (func == yura_hash)
1844                 return YURA_HASH;
1845         if (func == r5_hash)
1846                 return R5_HASH;
1847
1848         BUG();                  /* should never happen */
1849
1850         return 0;
1851 }
1852
1853 #define SWARN(silent, s, id, ...)                       \
1854         if (!(silent))                          \
1855                 reiserfs_warning(s, id, __VA_ARGS__)
1856
1857 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1858 {
1859         struct inode *root_inode;
1860         struct reiserfs_transaction_handle th;
1861         int old_format = 0;
1862         unsigned long blocks;
1863         unsigned int commit_max_age = 0;
1864         int jinit_done = 0;
1865         struct reiserfs_iget_args args;
1866         struct reiserfs_super_block *rs;
1867         char *jdev_name;
1868         struct reiserfs_sb_info *sbi;
1869         int errval = -EINVAL;
1870         char *qf_names[REISERFS_MAXQUOTAS] = {};
1871         unsigned int qfmt = 0;
1872
1873         save_mount_options(s, data);
1874
1875         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1876         if (!sbi)
1877                 return -ENOMEM;
1878         s->s_fs_info = sbi;
1879         /* Set default values for options: non-aggressive tails, RO on errors */
1880         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1881         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1882         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1883         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1884         sbi->s_alloc_options.preallocmin = 0;
1885         /* Preallocate by 16 blocks (17-1) at once */
1886         sbi->s_alloc_options.preallocsize = 17;
1887         /* setup default block allocator options */
1888         reiserfs_init_alloc_options(s);
1889
1890         spin_lock_init(&sbi->old_work_lock);
1891         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1892         mutex_init(&sbi->lock);
1893         sbi->lock_depth = -1;
1894
1895         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1896                                          s->s_id);
1897         if (!sbi->commit_wq) {
1898                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1899                 errval = -ENOMEM;
1900                 goto error_unlocked;
1901         }
1902
1903         jdev_name = NULL;
1904         if (reiserfs_parse_options
1905             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1906              &commit_max_age, qf_names, &qfmt) == 0) {
1907                 goto error_unlocked;
1908         }
1909         if (jdev_name && jdev_name[0]) {
1910                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1911                 if (!sbi->s_jdev) {
1912                         SWARN(silent, s, "", "Cannot allocate memory for "
1913                                 "journal device name");
1914                         goto error;
1915                 }
1916         }
1917 #ifdef CONFIG_QUOTA
1918         handle_quota_files(s, qf_names, &qfmt);
1919 #endif
1920
1921         if (blocks) {
1922                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1923                 goto error_unlocked;
1924         }
1925
1926         /*
1927          * try old format (undistributed bitmap, super block in 8-th 1k
1928          * block of a device)
1929          */
1930         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1931                 old_format = 1;
1932
1933         /*
1934          * try new format (64-th 1k block), which can contain reiserfs
1935          * super block
1936          */
1937         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1938                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1939                       s->s_id);
1940                 goto error_unlocked;
1941         }
1942
1943         rs = SB_DISK_SUPER_BLOCK(s);
1944         /*
1945          * Let's do basic sanity check to verify that underlying device is not
1946          * smaller than the filesystem. If the check fails then abort and
1947          * scream, because bad stuff will happen otherwise.
1948          */
1949         if (s->s_bdev && s->s_bdev->bd_inode
1950             && i_size_read(s->s_bdev->bd_inode) <
1951             sb_block_count(rs) * sb_blocksize(rs)) {
1952                 SWARN(silent, s, "", "Filesystem cannot be "
1953                       "mounted because it is bigger than the device");
1954                 SWARN(silent, s, "", "You may need to run fsck "
1955                       "or increase size of your LVM partition");
1956                 SWARN(silent, s, "", "Or may be you forgot to "
1957                       "reboot after fdisk when it told you to");
1958                 goto error_unlocked;
1959         }
1960
1961         sbi->s_mount_state = SB_REISERFS_STATE(s);
1962         sbi->s_mount_state = REISERFS_VALID_FS;
1963
1964         if ((errval = reiserfs_init_bitmap_cache(s))) {
1965                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1966                 goto error_unlocked;
1967         }
1968
1969         errval = -EINVAL;
1970 #ifdef CONFIG_REISERFS_CHECK
1971         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1972         SWARN(silent, s, "", "- it is slow mode for debugging.");
1973 #endif
1974
1975         /* make data=ordered the default */
1976         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1977             !reiserfs_data_writeback(s)) {
1978                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1979         }
1980
1981         if (reiserfs_data_log(s)) {
1982                 reiserfs_info(s, "using journaled data mode\n");
1983         } else if (reiserfs_data_ordered(s)) {
1984                 reiserfs_info(s, "using ordered data mode\n");
1985         } else {
1986                 reiserfs_info(s, "using writeback data mode\n");
1987         }
1988         if (reiserfs_barrier_flush(s)) {
1989                 printk("reiserfs: using flush barriers\n");
1990         }
1991
1992         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1993                 SWARN(silent, s, "sh-2022",
1994                       "unable to initialize journal space");
1995                 goto error_unlocked;
1996         } else {
1997                 /*
1998                  * once this is set, journal_release must be called
1999                  * if we error out of the mount
2000                  */
2001                 jinit_done = 1;
2002         }
2003
2004         if (reread_meta_blocks(s)) {
2005                 SWARN(silent, s, "jmacd-9",
2006                       "unable to reread meta blocks after journal init");
2007                 goto error_unlocked;
2008         }
2009
2010         if (replay_only(s))
2011                 goto error_unlocked;
2012
2013         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2014                 SWARN(silent, s, "clm-7000",
2015                       "Detected readonly device, marking FS readonly");
2016                 s->s_flags |= MS_RDONLY;
2017         }
2018         args.objectid = REISERFS_ROOT_OBJECTID;
2019         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2020         root_inode =
2021             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2022                          reiserfs_init_locked_inode, (void *)&args);
2023         if (!root_inode) {
2024                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2025                 goto error_unlocked;
2026         }
2027
2028         /*
2029          * This path assumed to be called with the BKL in the old times.
2030          * Now we have inherited the big reiserfs lock from it and many
2031          * reiserfs helpers called in the mount path and elsewhere require
2032          * this lock to be held even if it's not always necessary. Let's be
2033          * conservative and hold it early. The window can be reduced after
2034          * careful review of the code.
2035          */
2036         reiserfs_write_lock(s);
2037
2038         if (root_inode->i_state & I_NEW) {
2039                 reiserfs_read_locked_inode(root_inode, &args);
2040                 unlock_new_inode(root_inode);
2041         }
2042
2043         s->s_root = d_make_root(root_inode);
2044         if (!s->s_root)
2045                 goto error;
2046         /* define and initialize hash function */
2047         sbi->s_hash_function = hash_function(s);
2048         if (sbi->s_hash_function == NULL) {
2049                 dput(s->s_root);
2050                 s->s_root = NULL;
2051                 goto error;
2052         }
2053
2054         if (is_reiserfs_3_5(rs)
2055             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2056                 set_bit(REISERFS_3_5, &sbi->s_properties);
2057         else if (old_format)
2058                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2059         else
2060                 set_bit(REISERFS_3_6, &sbi->s_properties);
2061
2062         if (!(s->s_flags & MS_RDONLY)) {
2063
2064                 errval = journal_begin(&th, s, 1);
2065                 if (errval) {
2066                         dput(s->s_root);
2067                         s->s_root = NULL;
2068                         goto error;
2069                 }
2070                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2071
2072                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2073                 set_sb_fs_state(rs, 0);
2074
2075                 /*
2076                  * Clear out s_bmap_nr if it would wrap. We can handle this
2077                  * case, but older revisions can't. This will cause the
2078                  * file system to fail mount on those older implementations,
2079                  * avoiding corruption. -jeffm
2080                  */
2081                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2082                     sb_bmap_nr(rs) != 0) {
2083                         reiserfs_warning(s, "super-2030", "This file system "
2084                                         "claims to use %u bitmap blocks in "
2085                                         "its super block, but requires %u. "
2086                                         "Clearing to zero.", sb_bmap_nr(rs),
2087                                         reiserfs_bmap_count(s));
2088
2089                         set_sb_bmap_nr(rs, 0);
2090                 }
2091
2092                 if (old_format_only(s)) {
2093                         /*
2094                          * filesystem of format 3.5 either with standard
2095                          * or non-standard journal
2096                          */
2097                         if (convert_reiserfs(s)) {
2098                                 /* and -o conv is given */
2099                                 if (!silent)
2100                                         reiserfs_info(s,
2101                                                       "converting 3.5 filesystem to the 3.6 format");
2102
2103                                 if (is_reiserfs_3_5(rs))
2104                                         /*
2105                                          * put magic string of 3.6 format.
2106                                          * 2.2 will not be able to
2107                                          * mount this filesystem anymore
2108                                          */
2109                                         memcpy(rs->s_v1.s_magic,
2110                                                reiserfs_3_6_magic_string,
2111                                                sizeof
2112                                                (reiserfs_3_6_magic_string));
2113
2114                                 set_sb_version(rs, REISERFS_VERSION_2);
2115                                 reiserfs_convert_objectid_map_v1(s);
2116                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2117                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2118                         } else if (!silent) {
2119                                 reiserfs_info(s, "using 3.5.x disk format\n");
2120                         }
2121                 } else
2122                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2123
2124
2125                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2126                 errval = journal_end(&th);
2127                 if (errval) {
2128                         dput(s->s_root);
2129                         s->s_root = NULL;
2130                         goto error;
2131                 }
2132
2133                 reiserfs_write_unlock(s);
2134                 if ((errval = reiserfs_lookup_privroot(s)) ||
2135                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2136                         dput(s->s_root);
2137                         s->s_root = NULL;
2138                         goto error_unlocked;
2139                 }
2140                 reiserfs_write_lock(s);
2141
2142                 /*
2143                  * look for files which were to be removed in previous session
2144                  */
2145                 finish_unfinished(s);
2146         } else {
2147                 if (old_format_only(s) && !silent) {
2148                         reiserfs_info(s, "using 3.5.x disk format\n");
2149                 }
2150
2151                 reiserfs_write_unlock(s);
2152                 if ((errval = reiserfs_lookup_privroot(s)) ||
2153                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2154                         dput(s->s_root);
2155                         s->s_root = NULL;
2156                         goto error_unlocked;
2157                 }
2158                 reiserfs_write_lock(s);
2159         }
2160         /*
2161          * mark hash in super block: it could be unset. overwrite should be ok
2162          */
2163         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2164
2165         handle_attrs(s);
2166
2167         reiserfs_proc_info_init(s);
2168
2169         init_waitqueue_head(&(sbi->s_wait));
2170         spin_lock_init(&sbi->bitmap_lock);
2171
2172         reiserfs_write_unlock(s);
2173
2174         return (0);
2175
2176 error:
2177         reiserfs_write_unlock(s);
2178
2179 error_unlocked:
2180         /* kill the commit thread, free journal ram */
2181         if (jinit_done) {
2182                 reiserfs_write_lock(s);
2183                 journal_release_error(NULL, s);
2184                 reiserfs_write_unlock(s);
2185         }
2186
2187         if (sbi->commit_wq)
2188                 destroy_workqueue(sbi->commit_wq);
2189
2190         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2191
2192         reiserfs_free_bitmap_cache(s);
2193         if (SB_BUFFER_WITH_SB(s))
2194                 brelse(SB_BUFFER_WITH_SB(s));
2195 #ifdef CONFIG_QUOTA
2196         {
2197                 int j;
2198                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2199                         kfree(qf_names[j]);
2200         }
2201 #endif
2202         kfree(sbi);
2203
2204         s->s_fs_info = NULL;
2205         return errval;
2206 }
2207
2208 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2209 {
2210         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2211
2212         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2213         buf->f_bfree = sb_free_blocks(rs);
2214         buf->f_bavail = buf->f_bfree;
2215         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2216         buf->f_bsize = dentry->d_sb->s_blocksize;
2217         /* changed to accommodate gcc folks. */
2218         buf->f_type = REISERFS_SUPER_MAGIC;
2219         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2220         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2221                                 sizeof(rs->s_uuid)/2);
2222
2223         return 0;
2224 }
2225
2226 #ifdef CONFIG_QUOTA
2227 static int reiserfs_write_dquot(struct dquot *dquot)
2228 {
2229         struct reiserfs_transaction_handle th;
2230         int ret, err;
2231         int depth;
2232
2233         reiserfs_write_lock(dquot->dq_sb);
2234         ret =
2235             journal_begin(&th, dquot->dq_sb,
2236                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2237         if (ret)
2238                 goto out;
2239         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2240         ret = dquot_commit(dquot);
2241         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2242         err = journal_end(&th);
2243         if (!ret && err)
2244                 ret = err;
2245 out:
2246         reiserfs_write_unlock(dquot->dq_sb);
2247         return ret;
2248 }
2249
2250 static int reiserfs_acquire_dquot(struct dquot *dquot)
2251 {
2252         struct reiserfs_transaction_handle th;
2253         int ret, err;
2254         int depth;
2255
2256         reiserfs_write_lock(dquot->dq_sb);
2257         ret =
2258             journal_begin(&th, dquot->dq_sb,
2259                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2260         if (ret)
2261                 goto out;
2262         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2263         ret = dquot_acquire(dquot);
2264         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2265         err = journal_end(&th);
2266         if (!ret && err)
2267                 ret = err;
2268 out:
2269         reiserfs_write_unlock(dquot->dq_sb);
2270         return ret;
2271 }
2272
2273 static int reiserfs_release_dquot(struct dquot *dquot)
2274 {
2275         struct reiserfs_transaction_handle th;
2276         int ret, err;
2277
2278         reiserfs_write_lock(dquot->dq_sb);
2279         ret =
2280             journal_begin(&th, dquot->dq_sb,
2281                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2282         reiserfs_write_unlock(dquot->dq_sb);
2283         if (ret) {
2284                 /* Release dquot anyway to avoid endless cycle in dqput() */
2285                 dquot_release(dquot);
2286                 goto out;
2287         }
2288         ret = dquot_release(dquot);
2289         reiserfs_write_lock(dquot->dq_sb);
2290         err = journal_end(&th);
2291         if (!ret && err)
2292                 ret = err;
2293         reiserfs_write_unlock(dquot->dq_sb);
2294 out:
2295         return ret;
2296 }
2297
2298 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2299 {
2300         /* Are we journaling quotas? */
2301         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2302             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2303                 dquot_mark_dquot_dirty(dquot);
2304                 return reiserfs_write_dquot(dquot);
2305         } else
2306                 return dquot_mark_dquot_dirty(dquot);
2307 }
2308
2309 static int reiserfs_write_info(struct super_block *sb, int type)
2310 {
2311         struct reiserfs_transaction_handle th;
2312         int ret, err;
2313         int depth;
2314
2315         /* Data block + inode block */
2316         reiserfs_write_lock(sb);
2317         ret = journal_begin(&th, sb, 2);
2318         if (ret)
2319                 goto out;
2320         depth = reiserfs_write_unlock_nested(sb);
2321         ret = dquot_commit_info(sb, type);
2322         reiserfs_write_lock_nested(sb, depth);
2323         err = journal_end(&th);
2324         if (!ret && err)
2325                 ret = err;
2326 out:
2327         reiserfs_write_unlock(sb);
2328         return ret;
2329 }
2330
2331 /*
2332  * Turn on quotas during mount time - we need to find the quota file and such...
2333  */
2334 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2335 {
2336         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2337                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2338 }
2339
2340 /*
2341  * Standard function to be called on quota_on
2342  */
2343 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2344                              struct path *path)
2345 {
2346         int err;
2347         struct inode *inode;
2348         struct reiserfs_transaction_handle th;
2349         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2350
2351         reiserfs_write_lock(sb);
2352         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2353                 err = -EINVAL;
2354                 goto out;
2355         }
2356
2357         /* Quotafile not on the same filesystem? */
2358         if (path->dentry->d_sb != sb) {
2359                 err = -EXDEV;
2360                 goto out;
2361         }
2362         inode = d_inode(path->dentry);
2363         /*
2364          * We must not pack tails for quota files on reiserfs for quota
2365          * IO to work
2366          */
2367         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2368                 err = reiserfs_unpack(inode, NULL);
2369                 if (err) {
2370                         reiserfs_warning(sb, "super-6520",
2371                                 "Unpacking tail of quota file failed"
2372                                 " (%d). Cannot turn on quotas.", err);
2373                         err = -EINVAL;
2374                         goto out;
2375                 }
2376                 mark_inode_dirty(inode);
2377         }
2378         /* Journaling quota? */
2379         if (REISERFS_SB(sb)->s_qf_names[type]) {
2380                 /* Quotafile not of fs root? */
2381                 if (path->dentry->d_parent != sb->s_root)
2382                         reiserfs_warning(sb, "super-6521",
2383                                  "Quota file not on filesystem root. "
2384                                  "Journalled quota will not work.");
2385         }
2386
2387         /*
2388          * When we journal data on quota file, we have to flush journal to see
2389          * all updates to the file when we bypass pagecache...
2390          */
2391         if (reiserfs_file_data_log(inode)) {
2392                 /* Just start temporary transaction and finish it */
2393                 err = journal_begin(&th, sb, 1);
2394                 if (err)
2395                         goto out;
2396                 err = journal_end_sync(&th);
2397                 if (err)
2398                         goto out;
2399         }
2400         reiserfs_write_unlock(sb);
2401         return dquot_quota_on(sb, type, format_id, path);
2402 out:
2403         reiserfs_write_unlock(sb);
2404         return err;
2405 }
2406
2407 /*
2408  * Read data from quotafile - avoid pagecache and such because we cannot afford
2409  * acquiring the locks... As quota files are never truncated and quota code
2410  * itself serializes the operations (and no one else should touch the files)
2411  * we don't have to be afraid of races
2412  */
2413 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2414                                    size_t len, loff_t off)
2415 {
2416         struct inode *inode = sb_dqopt(sb)->files[type];
2417         unsigned long blk = off >> sb->s_blocksize_bits;
2418         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2419         size_t toread;
2420         struct buffer_head tmp_bh, *bh;
2421         loff_t i_size = i_size_read(inode);
2422
2423         if (off > i_size)
2424                 return 0;
2425         if (off + len > i_size)
2426                 len = i_size - off;
2427         toread = len;
2428         while (toread > 0) {
2429                 tocopy =
2430                     sb->s_blocksize - offset <
2431                     toread ? sb->s_blocksize - offset : toread;
2432                 tmp_bh.b_state = 0;
2433                 /*
2434                  * Quota files are without tails so we can safely
2435                  * use this function
2436                  */
2437                 reiserfs_write_lock(sb);
2438                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2439                 reiserfs_write_unlock(sb);
2440                 if (err)
2441                         return err;
2442                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2443                         memset(data, 0, tocopy);
2444                 else {
2445                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2446                         if (!bh)
2447                                 return -EIO;
2448                         memcpy(data, bh->b_data + offset, tocopy);
2449                         brelse(bh);
2450                 }
2451                 offset = 0;
2452                 toread -= tocopy;
2453                 data += tocopy;
2454                 blk++;
2455         }
2456         return len;
2457 }
2458
2459 /*
2460  * Write to quotafile (we know the transaction is already started and has
2461  * enough credits)
2462  */
2463 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2464                                     const char *data, size_t len, loff_t off)
2465 {
2466         struct inode *inode = sb_dqopt(sb)->files[type];
2467         unsigned long blk = off >> sb->s_blocksize_bits;
2468         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2469         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2470         size_t towrite = len;
2471         struct buffer_head tmp_bh, *bh;
2472
2473         if (!current->journal_info) {
2474                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2475                         (unsigned long long)off, (unsigned long long)len);
2476                 return -EIO;
2477         }
2478         while (towrite > 0) {
2479                 tocopy = sb->s_blocksize - offset < towrite ?
2480                     sb->s_blocksize - offset : towrite;
2481                 tmp_bh.b_state = 0;
2482                 reiserfs_write_lock(sb);
2483                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2484                 reiserfs_write_unlock(sb);
2485                 if (err)
2486                         goto out;
2487                 if (offset || tocopy != sb->s_blocksize)
2488                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2489                 else
2490                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2491                 if (!bh) {
2492                         err = -EIO;
2493                         goto out;
2494                 }
2495                 lock_buffer(bh);
2496                 memcpy(bh->b_data + offset, data, tocopy);
2497                 flush_dcache_page(bh->b_page);
2498                 set_buffer_uptodate(bh);
2499                 unlock_buffer(bh);
2500                 reiserfs_write_lock(sb);
2501                 reiserfs_prepare_for_journal(sb, bh, 1);
2502                 journal_mark_dirty(current->journal_info, bh);
2503                 if (!journal_quota)
2504                         reiserfs_add_ordered_list(inode, bh);
2505                 reiserfs_write_unlock(sb);
2506                 brelse(bh);
2507                 offset = 0;
2508                 towrite -= tocopy;
2509                 data += tocopy;
2510                 blk++;
2511         }
2512 out:
2513         if (len == towrite)
2514                 return err;
2515         if (inode->i_size < off + len - towrite)
2516                 i_size_write(inode, off + len - towrite);
2517         inode->i_version++;
2518         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2519         mark_inode_dirty(inode);
2520         return len - towrite;
2521 }
2522
2523 #endif
2524
2525 static struct dentry *get_super_block(struct file_system_type *fs_type,
2526                            int flags, const char *dev_name,
2527                            void *data)
2528 {
2529         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2530 }
2531
2532 static int __init init_reiserfs_fs(void)
2533 {
2534         int ret;
2535
2536         ret = init_inodecache();
2537         if (ret)
2538                 return ret;
2539
2540         reiserfs_proc_info_global_init();
2541
2542         ret = register_filesystem(&reiserfs_fs_type);
2543         if (ret)
2544                 goto out;
2545
2546         return 0;
2547 out:
2548         reiserfs_proc_info_global_done();
2549         destroy_inodecache();
2550
2551         return ret;
2552 }
2553
2554 static void __exit exit_reiserfs_fs(void)
2555 {
2556         reiserfs_proc_info_global_done();
2557         unregister_filesystem(&reiserfs_fs_type);
2558         destroy_inodecache();
2559 }
2560
2561 struct file_system_type reiserfs_fs_type = {
2562         .owner = THIS_MODULE,
2563         .name = "reiserfs",
2564         .mount = get_super_block,
2565         .kill_sb = reiserfs_kill_sb,
2566         .fs_flags = FS_REQUIRES_DEV,
2567 };
2568 MODULE_ALIAS_FS("reiserfs");
2569
2570 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2571 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2572 MODULE_LICENSE("GPL");
2573
2574 module_init(init_reiserfs_fs);
2575 module_exit(exit_reiserfs_fs);