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         /* Avoid clobbering the cancel state... */
  94         if (sbi->work_queued == 1)
  95                 sbi->work_queued = 0;
  96         spin_unlock(&sbi->old_work_lock);
  97
  98         reiserfs_sync_fs(s, 1);
  99 }
 100
 101 void reiserfs_schedule_old_flush(struct super_block *s)
 102 {
 103         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 104         unsigned long delay;
 105
 106         /*
 107          * Avoid scheduling flush when sb is being shut down. It can race
 108          * with journal shutdown and free still queued delayed work.
 109          */
 110         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 111                 return;
 112
 113         spin_lock(&sbi->old_work_lock);
 114         if (!sbi->work_queued) {
 115                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 116                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 117                 sbi->work_queued = 1;
 118         }
 119         spin_unlock(&sbi->old_work_lock);
 120 }
 121
 122 void reiserfs_cancel_old_flush(struct super_block *s)
 123 {
 124         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 125
 126         spin_lock(&sbi->old_work_lock);
 127         /* Make sure no new flushes will be queued */
 128         sbi->work_queued = 2;
 129         spin_unlock(&sbi->old_work_lock);
 130         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 131 }
 132
 133 static int reiserfs_freeze(struct super_block *s)
 134 {
 135         struct reiserfs_transaction_handle th;
 136
 137         reiserfs_cancel_old_flush(s);
 138
 139         reiserfs_write_lock(s);
 140         if (!(s->s_flags & MS_RDONLY)) {
 141                 int err = journal_begin(&th, s, 1);
 142                 if (err) {
 143                         reiserfs_block_writes(&th);
 144                 } else {
 145                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 146                                                      1);
 147                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 148                         reiserfs_block_writes(&th);
 149                         journal_end_sync(&th);
 150                 }
 151         }
 152         reiserfs_write_unlock(s);
 153         return 0;
 154 }
 155
 156 static int reiserfs_unfreeze(struct super_block *s)
 157 {
 158         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 159
 160         reiserfs_allow_writes(s);
 161         spin_lock(&sbi->old_work_lock);
 162         /* Allow old_work to run again */
 163         sbi->work_queued = 0;
 164         spin_unlock(&sbi->old_work_lock);
 165         return 0;
 166 }
 167
 168 extern const struct in_core_key MAX_IN_CORE_KEY;
 169
 170 /*
 171  * this is used to delete "save link" when there are no items of a
 172  * file it points to. It can either happen if unlink is completed but
 173  * "save unlink" removal, or if file has both unlink and truncate
 174  * pending and as unlink completes first (because key of "save link"
 175  * protecting unlink is bigger that a key lf "save link" which
 176  * protects truncate), so there left no items to make truncate
 177  * completion on
 178  */
 179 static int remove_save_link_only(struct super_block *s,
 180                                  struct reiserfs_key *key, int oid_free)
 181 {
 182         struct reiserfs_transaction_handle th;
 183         int err;
 184
 185         /* we are going to do one balancing */
 186         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 187         if (err)
 188                 return err;
 189
 190         reiserfs_delete_solid_item(&th, NULL, key);
 191         if (oid_free)
 192                 /* removals are protected by direct items */
 193                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 194
 195         return journal_end(&th);
 196 }
 197
 198 #ifdef CONFIG_QUOTA
 199 static int reiserfs_quota_on_mount(struct super_block *, int);
 200 #endif
 201
 202 /*
 203  * Look for uncompleted unlinks and truncates and complete them
 204  *
 205  * Called with superblock write locked.  If quotas are enabled, we have to
 206  * release/retake lest we call dquot_quota_on_mount(), proceed to
 207  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
 208  * cpu worklets to complete flush_async_commits() that in turn wait for the
 209  * superblock write lock.
 210  */
 211 static int finish_unfinished(struct super_block *s)
 212 {
 213         INITIALIZE_PATH(path);
 214         struct cpu_key max_cpu_key, obj_key;
 215         struct reiserfs_key save_link_key, last_inode_key;
 216         int retval = 0;
 217         struct item_head *ih;
 218         struct buffer_head *bh;
 219         int item_pos;
 220         char *item;
 221         int done;
 222         struct inode *inode;
 223         int truncate;
 224 #ifdef CONFIG_QUOTA
 225         int i;
 226         int ms_active_set;
 227         int quota_enabled[REISERFS_MAXQUOTAS];
 228 #endif
 229
 230         /* compose key to look for "save" links */
 231         max_cpu_key.version = KEY_FORMAT_3_5;
 232         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 233         max_cpu_key.on_disk_key.k_objectid = ~0U;
 234         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 235         max_cpu_key.key_length = 3;
 236
 237         memset(&last_inode_key, 0, sizeof(last_inode_key));
 238
 239 #ifdef CONFIG_QUOTA
 240         /* Needed for iput() to work correctly and not trash data */
 241         if (s->s_flags & MS_ACTIVE) {
 242                 ms_active_set = 0;
 243         } else {
 244                 ms_active_set = 1;
 245                 s->s_flags |= MS_ACTIVE;
 246         }
 247         /* Turn on quotas so that they are updated correctly */
 248         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 249                 quota_enabled[i] = 1;
 250                 if (REISERFS_SB(s)->s_qf_names[i]) {
 251                         int ret;
 252
 253                         if (sb_has_quota_active(s, i)) {
 254                                 quota_enabled[i] = 0;
 255                                 continue;
 256                         }
 257                         reiserfs_write_unlock(s);
 258                         ret = reiserfs_quota_on_mount(s, i);
 259                         reiserfs_write_lock(s);
 260                         if (ret < 0)
 261                                 reiserfs_warning(s, "reiserfs-2500",
 262                                                  "cannot turn on journaled "
 263                                                  "quota: error %d", ret);
 264                 }
 265         }
 266 #endif
 267
 268         done = 0;
 269         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 270         while (!retval) {
 271                 int depth;
 272                 retval = search_item(s, &max_cpu_key, &path);
 273                 if (retval != ITEM_NOT_FOUND) {
 274                         reiserfs_error(s, "vs-2140",
 275                                        "search_by_key returned %d", retval);
 276                         break;
 277                 }
 278
 279                 bh = get_last_bh(&path);
 280                 item_pos = get_item_pos(&path);
 281                 if (item_pos != B_NR_ITEMS(bh)) {
 282                         reiserfs_warning(s, "vs-2060",
 283                                          "wrong position found");
 284                         break;
 285                 }
 286                 item_pos--;
 287                 ih = item_head(bh, item_pos);
 288
 289                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 290                         /* there are no "save" links anymore */
 291                         break;
 292
 293                 save_link_key = ih->ih_key;
 294                 if (is_indirect_le_ih(ih))
 295                         truncate = 1;
 296                 else
 297                         truncate = 0;
 298
 299                 /* reiserfs_iget needs k_dirid and k_objectid only */
 300                 item = ih_item_body(bh, ih);
 301                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 302                 obj_key.on_disk_key.k_objectid =
 303                     le32_to_cpu(ih->ih_key.k_objectid);
 304                 obj_key.on_disk_key.k_offset = 0;
 305                 obj_key.on_disk_key.k_type = 0;
 306
 307                 pathrelse(&path);
 308
 309                 inode = reiserfs_iget(s, &obj_key);
 310                 if (IS_ERR_OR_NULL(inode)) {
 311                         /*
 312                          * the unlink almost completed, it just did not
 313                          * manage to remove "save" link and release objectid
 314                          */
 315                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 316                                          &obj_key);
 317                         retval = remove_save_link_only(s, &save_link_key, 1);
 318                         continue;
 319                 }
 320
 321                 if (!truncate && inode->i_nlink) {
 322                         /* file is not unlinked */
 323                         reiserfs_warning(s, "vs-2185",
 324                                          "file %K is not unlinked",
 325                                          &obj_key);
 326                         retval = remove_save_link_only(s, &save_link_key, 0);
 327                         continue;
 328                 }
 329                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 330                 dquot_initialize(inode);
 331                 reiserfs_write_lock_nested(inode->i_sb, depth);
 332
 333                 if (truncate && S_ISDIR(inode->i_mode)) {
 334                         /*
 335                          * We got a truncate request for a dir which
 336                          * is impossible.  The only imaginable way is to
 337                          * execute unfinished truncate request then boot
 338                          * into old kernel, remove the file and create dir
 339                          * with the same key.
 340                          */
 341                         reiserfs_warning(s, "green-2101",
 342                                          "impossible truncate on a "
 343                                          "directory %k. Please report",
 344                                          INODE_PKEY(inode));
 345                         retval = remove_save_link_only(s, &save_link_key, 0);
 346                         truncate = 0;
 347                         iput(inode);
 348                         continue;
 349                 }
 350
 351                 if (truncate) {
 352                         REISERFS_I(inode)->i_flags |=
 353                             i_link_saved_truncate_mask;
 354                         /*
 355                          * not completed truncate found. New size was
 356                          * committed together with "save" link
 357                          */
 358                         reiserfs_info(s, "Truncating %k to %lld ..",
 359                                       INODE_PKEY(inode), inode->i_size);
 360
 361                         /* don't update modification time */
 362                         reiserfs_truncate_file(inode, 0);
 363
 364                         retval = remove_save_link(inode, truncate);
 365                 } else {
 366                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 367                         /* not completed unlink (rmdir) found */
 368                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 369                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 370                                         sizeof(last_inode_key))){
 371                                 last_inode_key = *INODE_PKEY(inode);
 372                                 /* removal gets completed in iput */
 373                                 retval = 0;
 374                         } else {
 375                                 reiserfs_warning(s, "super-2189", "Dead loop "
 376                                                  "in finish_unfinished "
 377                                                  "detected, just remove "
 378                                                  "save link\n");
 379                                 retval = remove_save_link_only(s,
 380                                                         &save_link_key, 0);
 381                         }
 382                 }
 383
 384                 iput(inode);
 385                 printk("done\n");
 386                 done++;
 387         }
 388         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 389
 390 #ifdef CONFIG_QUOTA
 391         /* Turn quotas off */
 392         reiserfs_write_unlock(s);
 393         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 394                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 395                         dquot_quota_off(s, i);
 396         }
 397         reiserfs_write_lock(s);
 398         if (ms_active_set)
 399                 /* Restore the flag back */
 400                 s->s_flags &= ~MS_ACTIVE;
 401 #endif
 402         pathrelse(&path);
 403         if (done)
 404                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 405                               "Completed\n", done);
 406         return retval;
 407 }
 408
 409 /*
 410  * to protect file being unlinked from getting lost we "safe" link files
 411  * being unlinked. This link will be deleted in the same transaction with last
 412  * item of file. mounting the filesystem we scan all these links and remove
 413  * files which almost got lost
 414  */
 415 void add_save_link(struct reiserfs_transaction_handle *th,
 416                    struct inode *inode, int truncate)
 417 {
 418         INITIALIZE_PATH(path);
 419         int retval;
 420         struct cpu_key key;
 421         struct item_head ih;
 422         __le32 link;
 423
 424         BUG_ON(!th->t_trans_id);
 425
 426         /* file can only get one "save link" of each kind */
 427         RFALSE(truncate &&
 428                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 429                "saved link already exists for truncated inode %lx",
 430                (long)inode->i_ino);
 431         RFALSE(!truncate &&
 432                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 433                "saved link already exists for unlinked inode %lx",
 434                (long)inode->i_ino);
 435
 436         /* setup key of "save" link */
 437         key.version = KEY_FORMAT_3_5;
 438         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 439         key.on_disk_key.k_objectid = inode->i_ino;
 440         if (!truncate) {
 441                 /* unlink, rmdir, rename */
 442                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 443                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 444
 445                 /* item head of "safe" link */
 446                 make_le_item_head(&ih, &key, key.version,
 447                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 448                                   4 /*length */ , 0xffff /*free space */ );
 449         } else {
 450                 /* truncate */
 451                 if (S_ISDIR(inode->i_mode))
 452                         reiserfs_warning(inode->i_sb, "green-2102",
 453                                          "Adding a truncate savelink for "
 454                                          "a directory %k! Please report",
 455                                          INODE_PKEY(inode));
 456                 set_cpu_key_k_offset(&key, 1);
 457                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 458
 459                 /* item head of "safe" link */
 460                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 461                                   4 /*length */ , 0 /*free space */ );
 462         }
 463         key.key_length = 3;
 464
 465         /* look for its place in the tree */
 466         retval = search_item(inode->i_sb, &key, &path);
 467         if (retval != ITEM_NOT_FOUND) {
 468                 if (retval != -ENOSPC)
 469                         reiserfs_error(inode->i_sb, "vs-2100",
 470                                        "search_by_key (%K) returned %d", &key,
 471                                        retval);
 472                 pathrelse(&path);
 473                 return;
 474         }
 475
 476         /* body of "save" link */
 477         link = INODE_PKEY(inode)->k_dir_id;
 478
 479         /* put "save" link into tree, don't charge quota to anyone */
 480         retval =
 481             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 482         if (retval) {
 483                 if (retval != -ENOSPC)
 484                         reiserfs_error(inode->i_sb, "vs-2120",
 485                                        "insert_item returned %d", retval);
 486         } else {
 487                 if (truncate)
 488                         REISERFS_I(inode)->i_flags |=
 489                             i_link_saved_truncate_mask;
 490                 else
 491                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 492         }
 493 }
 494
 495 /* this opens transaction unlike add_save_link */
 496 int remove_save_link(struct inode *inode, int truncate)
 497 {
 498         struct reiserfs_transaction_handle th;
 499         struct reiserfs_key key;
 500         int err;
 501
 502         /* we are going to do one balancing only */
 503         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 504         if (err)
 505                 return err;
 506
 507         /* setup key of "save" link */
 508         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 509         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 510         if (!truncate) {
 511                 /* unlink, rmdir, rename */
 512                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 513                                     1 + inode->i_sb->s_blocksize);
 514                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 515         } else {
 516                 /* truncate */
 517                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 518                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 519         }
 520
 521         if ((truncate &&
 522              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 523             (!truncate &&
 524              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 525                 /* don't take quota bytes from anywhere */
 526                 reiserfs_delete_solid_item(&th, NULL, &key);
 527         if (!truncate) {
 528                 reiserfs_release_objectid(&th, inode->i_ino);
 529                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 530         } else
 531                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 532
 533         return journal_end(&th);
 534 }
 535
 536 static void reiserfs_kill_sb(struct super_block *s)
 537 {
 538         if (REISERFS_SB(s)) {
 539                 reiserfs_proc_info_done(s);
 540                 /*
 541                  * Force any pending inode evictions to occur now. Any
 542                  * inodes to be removed that have extended attributes
 543                  * associated with them need to clean them up before
 544                  * we can release the extended attribute root dentries.
 545                  * shrink_dcache_for_umount will BUG if we don't release
 546                  * those before it's called so ->put_super is too late.
 547                  */
 548                 shrink_dcache_sb(s);
 549
 550                 dput(REISERFS_SB(s)->xattr_root);
 551                 REISERFS_SB(s)->xattr_root = NULL;
 552                 dput(REISERFS_SB(s)->priv_root);
 553                 REISERFS_SB(s)->priv_root = NULL;
 554         }
 555
 556         kill_block_super(s);
 557 }
 558
 559 static void reiserfs_put_super(struct super_block *s)
 560 {
 561         struct reiserfs_transaction_handle th;
 562         th.t_trans_id = 0;
 563
 564         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 565
 566         reiserfs_write_lock(s);
 567
 568         /*
 569          * change file system state to current state if it was mounted
 570          * with read-write permissions
 571          */
 572         if (!(s->s_flags & MS_RDONLY)) {
 573                 if (!journal_begin(&th, s, 10)) {
 574                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 575                                                      1);
 576                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 577                                             REISERFS_SB(s)->s_mount_state);
 578                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 579                 }
 580         }
 581
 582         /*
 583          * note, journal_release checks for readonly mount, and can
 584          * decide not to do a journal_end
 585          */
 586         journal_release(&th, s);
 587
 588         reiserfs_free_bitmap_cache(s);
 589
 590         brelse(SB_BUFFER_WITH_SB(s));
 591
 592         print_statistics(s);
 593
 594         if (REISERFS_SB(s)->reserved_blocks != 0) {
 595                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 596                                  REISERFS_SB(s)->reserved_blocks);
 597         }
 598
 599         reiserfs_write_unlock(s);
 600         mutex_destroy(&REISERFS_SB(s)->lock);
 601         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 602         kfree(s->s_fs_info);
 603         s->s_fs_info = NULL;
 604 }
 605
 606 static struct kmem_cache *reiserfs_inode_cachep;
 607
 608 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 609 {
 610         struct reiserfs_inode_info *ei;
 611         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 612         if (!ei)
 613                 return NULL;
 614         atomic_set(&ei->openers, 0);
 615         mutex_init(&ei->tailpack);
 616 #ifdef CONFIG_QUOTA
 617         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 618 #endif
 619
 620         return &ei->vfs_inode;
 621 }
 622
 623 static void reiserfs_i_callback(struct rcu_head *head)
 624 {
 625         struct inode *inode = container_of(head, struct inode, i_rcu);
 626         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 627 }
 628
 629 static void reiserfs_destroy_inode(struct inode *inode)
 630 {
 631         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 632 }
 633
 634 static void init_once(void *foo)
 635 {
 636         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 637
 638         INIT_LIST_HEAD(&ei->i_prealloc_list);
 639         inode_init_once(&ei->vfs_inode);
 640 }
 641
 642 static int __init init_inodecache(void)
 643 {
 644         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 645                                                   sizeof(struct
 646                                                          reiserfs_inode_info),
 647                                                   0, (SLAB_RECLAIM_ACCOUNT|
 648                                                       SLAB_MEM_SPREAD|
 649                                                       SLAB_ACCOUNT),
 650                                                   init_once);
 651         if (reiserfs_inode_cachep == NULL)
 652                 return -ENOMEM;
 653         return 0;
 654 }
 655
 656 static void destroy_inodecache(void)
 657 {
 658         /*
 659          * Make sure all delayed rcu free inodes are flushed before we
 660          * destroy cache.
 661          */
 662         rcu_barrier();
 663         kmem_cache_destroy(reiserfs_inode_cachep);
 664 }
 665
 666 /* we don't mark inodes dirty, we just log them */
 667 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 668 {
 669         struct reiserfs_transaction_handle th;
 670
 671         int err = 0;
 672
 673         if (inode->i_sb->s_flags & MS_RDONLY) {
 674                 reiserfs_warning(inode->i_sb, "clm-6006",
 675                                  "writing inode %lu on readonly FS",
 676                                  inode->i_ino);
 677                 return;
 678         }
 679         reiserfs_write_lock(inode->i_sb);
 680
 681         /*
 682          * this is really only used for atime updates, so they don't have
 683          * to be included in O_SYNC or fsync
 684          */
 685         err = journal_begin(&th, inode->i_sb, 1);
 686         if (err)
 687                 goto out;
 688
 689         reiserfs_update_sd(&th, inode);
 690         journal_end(&th);
 691
 692 out:
 693         reiserfs_write_unlock(inode->i_sb);
 694 }
 695
 696 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 697 {
 698         struct super_block *s = root->d_sb;
 699         struct reiserfs_journal *journal = SB_JOURNAL(s);
 700         long opts = REISERFS_SB(s)->s_mount_opt;
 701
 702         if (opts & (1 << REISERFS_LARGETAIL))
 703                 seq_puts(seq, ",tails=on");
 704         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 705                 seq_puts(seq, ",notail");
 706         /* tails=small is default so we don't show it */
 707
 708         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 709                 seq_puts(seq, ",barrier=none");
 710         /* barrier=flush is default so we don't show it */
 711
 712         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 713                 seq_puts(seq, ",errors=continue");
 714         else if (opts & (1 << REISERFS_ERROR_PANIC))
 715                 seq_puts(seq, ",errors=panic");
 716         /* errors=ro is default so we don't show it */
 717
 718         if (opts & (1 << REISERFS_DATA_LOG))
 719                 seq_puts(seq, ",data=journal");
 720         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 721                 seq_puts(seq, ",data=writeback");
 722         /* data=ordered is default so we don't show it */
 723
 724         if (opts & (1 << REISERFS_ATTRS))
 725                 seq_puts(seq, ",attrs");
 726
 727         if (opts & (1 << REISERFS_XATTRS_USER))
 728                 seq_puts(seq, ",user_xattr");
 729
 730         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 731                 seq_puts(seq, ",expose_privroot");
 732
 733         if (opts & (1 << REISERFS_POSIXACL))
 734                 seq_puts(seq, ",acl");
 735
 736         if (REISERFS_SB(s)->s_jdev)
 737                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 738
 739         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 740                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 741
 742 #ifdef CONFIG_QUOTA
 743         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 744                 seq_show_option(seq, "usrjquota",
 745                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 746         else if (opts & (1 << REISERFS_USRQUOTA))
 747                 seq_puts(seq, ",usrquota");
 748         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 749                 seq_show_option(seq, "grpjquota",
 750                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 751         else if (opts & (1 << REISERFS_GRPQUOTA))
 752                 seq_puts(seq, ",grpquota");
 753         if (REISERFS_SB(s)->s_jquota_fmt) {
 754                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 755                         seq_puts(seq, ",jqfmt=vfsold");
 756                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 757                         seq_puts(seq, ",jqfmt=vfsv0");
 758         }
 759 #endif
 760
 761         /* Block allocator options */
 762         if (opts & (1 << REISERFS_NO_BORDER))
 763                 seq_puts(seq, ",block-allocator=noborder");
 764         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 765                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 766         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 767                 seq_puts(seq, ",block-allocator=hashed_relocation");
 768         if (opts & (1 << REISERFS_TEST4))
 769                 seq_puts(seq, ",block-allocator=test4");
 770         show_alloc_options(seq, s);
 771         return 0;
 772 }
 773
 774 #ifdef CONFIG_QUOTA
 775 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 776                                     size_t, loff_t);
 777 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 778                                    loff_t);
 779
 780 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 781 {
 782         return REISERFS_I(inode)->i_dquot;
 783 }
 784 #endif
 785
 786 static const struct super_operations reiserfs_sops = {
 787         .alloc_inode = reiserfs_alloc_inode,
 788         .destroy_inode = reiserfs_destroy_inode,
 789         .write_inode = reiserfs_write_inode,
 790         .dirty_inode = reiserfs_dirty_inode,
 791         .evict_inode = reiserfs_evict_inode,
 792         .put_super = reiserfs_put_super,
 793         .sync_fs = reiserfs_sync_fs,
 794         .freeze_fs = reiserfs_freeze,
 795         .unfreeze_fs = reiserfs_unfreeze,
 796         .statfs = reiserfs_statfs,
 797         .remount_fs = reiserfs_remount,
 798         .show_options = reiserfs_show_options,
 799 #ifdef CONFIG_QUOTA
 800         .quota_read = reiserfs_quota_read,
 801         .quota_write = reiserfs_quota_write,
 802         .get_dquots = reiserfs_get_dquots,
 803 #endif
 804 };
 805
 806 #ifdef CONFIG_QUOTA
 807 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 808
 809 static int reiserfs_write_dquot(struct dquot *);
 810 static int reiserfs_acquire_dquot(struct dquot *);
 811 static int reiserfs_release_dquot(struct dquot *);
 812 static int reiserfs_mark_dquot_dirty(struct dquot *);
 813 static int reiserfs_write_info(struct super_block *, int);
 814 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 815
 816 static const struct dquot_operations reiserfs_quota_operations = {
 817         .write_dquot = reiserfs_write_dquot,
 818         .acquire_dquot = reiserfs_acquire_dquot,
 819         .release_dquot = reiserfs_release_dquot,
 820         .mark_dirty = reiserfs_mark_dquot_dirty,
 821         .write_info = reiserfs_write_info,
 822         .alloc_dquot    = dquot_alloc,
 823         .destroy_dquot  = dquot_destroy,
 824         .get_next_id    = dquot_get_next_id,
 825 };
 826
 827 static const struct quotactl_ops reiserfs_qctl_operations = {
 828         .quota_on = reiserfs_quota_on,
 829         .quota_off = dquot_quota_off,
 830         .quota_sync = dquot_quota_sync,
 831         .get_state = dquot_get_state,
 832         .set_info = dquot_set_dqinfo,
 833         .get_dqblk = dquot_get_dqblk,
 834         .set_dqblk = dquot_set_dqblk,
 835 };
 836 #endif
 837
 838 static const struct export_operations reiserfs_export_ops = {
 839         .encode_fh = reiserfs_encode_fh,
 840         .fh_to_dentry = reiserfs_fh_to_dentry,
 841         .fh_to_parent = reiserfs_fh_to_parent,
 842         .get_parent = reiserfs_get_parent,
 843 };
 844
 845 /*
 846  * this struct is used in reiserfs_getopt () for containing the value for
 847  * those mount options that have values rather than being toggles.
 848  */
 849 typedef struct {
 850         char *value;
 851         /*
 852          * bitmask which is to set on mount_options bitmask
 853          * when this value is found, 0 is no bits are to be changed.
 854          */
 855         int setmask;
 856         /*
 857          * bitmask which is to clear on mount_options bitmask
 858          * when this value is found, 0 is no bits are to be changed.
 859          * This is applied BEFORE setmask
 860          */
 861         int clrmask;
 862 } arg_desc_t;
 863
 864 /* Set this bit in arg_required to allow empty arguments */
 865 #define REISERFS_OPT_ALLOWEMPTY 31
 866
 867 /*
 868  * this struct is used in reiserfs_getopt() for describing the
 869  * set of reiserfs mount options
 870  */
 871 typedef struct {
 872         char *option_name;
 873
 874         /* 0 if argument is not required, not 0 otherwise */
 875         int arg_required;
 876
 877         /* list of values accepted by an option */
 878         const arg_desc_t *values;
 879
 880         /*
 881          * bitmask which is to set on mount_options bitmask
 882          * when this value is found, 0 is no bits are to be changed.
 883          */
 884         int setmask;
 885
 886         /*
 887          * bitmask which is to clear on mount_options bitmask
 888          * when this value is found, 0 is no bits are to be changed.
 889          * This is applied BEFORE setmask
 890          */
 891         int clrmask;
 892 } opt_desc_t;
 893
 894 /* possible values for -o data= */
 895 static const arg_desc_t logging_mode[] = {
 896         {"ordered", 1 << REISERFS_DATA_ORDERED,
 897          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 898         {"journal", 1 << REISERFS_DATA_LOG,
 899          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 900         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 901          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 902         {.value = NULL}
 903 };
 904
 905 /* possible values for -o barrier= */
 906 static const arg_desc_t barrier_mode[] = {
 907         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 908         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 909         {.value = NULL}
 910 };
 911
 912 /*
 913  * possible values for "-o block-allocator=" and bits which are to be set in
 914  * s_mount_opt of reiserfs specific part of in-core super block
 915  */
 916 static const arg_desc_t balloc[] = {
 917         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 918         {"border", 0, 1 << REISERFS_NO_BORDER},
 919         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 920         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 921         {"test4", 1 << REISERFS_TEST4, 0},
 922         {"notest4", 0, 1 << REISERFS_TEST4},
 923         {NULL, 0, 0}
 924 };
 925
 926 static const arg_desc_t tails[] = {
 927         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 928         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 929         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 930         {NULL, 0, 0}
 931 };
 932
 933 static const arg_desc_t error_actions[] = {
 934         {"panic", 1 << REISERFS_ERROR_PANIC,
 935          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 936         {"ro-remount", 1 << REISERFS_ERROR_RO,
 937          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 938 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 939         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 940          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 941 #endif
 942         {NULL, 0, 0},
 943 };
 944
 945 /*
 946  * proceed only one option from a list *cur - string containing of mount
 947  * options
 948  * opts - array of options which are accepted
 949  * opt_arg - if option is found and requires an argument and if it is specifed
 950  * in the input - pointer to the argument is stored here
 951  * bit_flags - if option requires to set a certain bit - it is set here
 952  * return -1 if unknown option is found, opt->arg_required otherwise
 953  */
 954 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 955                            char **opt_arg, unsigned long *bit_flags)
 956 {
 957         char *p;
 958         /*
 959          * foo=bar,
 960          * ^   ^  ^
 961          * |   |  +-- option_end
 962          * |   +-- arg_start
 963          * +-- option_start
 964          */
 965         const opt_desc_t *opt;
 966         const arg_desc_t *arg;
 967
 968         p = *cur;
 969
 970         /* assume argument cannot contain commas */
 971         *cur = strchr(p, ',');
 972         if (*cur) {
 973                 *(*cur) = '\0';
 974                 (*cur)++;
 975         }
 976
 977         if (!strncmp(p, "alloc=", 6)) {
 978                 /*
 979                  * Ugly special case, probably we should redo options
 980                  * parser so that it can understand several arguments for
 981                  * some options, also so that it can fill several bitfields
 982                  * with option values.
 983                  */
 984                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 985                         return -1;
 986                 } else {
 987                         return 0;
 988                 }
 989         }
 990
 991         /* for every option in the list */
 992         for (opt = opts; opt->option_name; opt++) {
 993                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 994                         if (bit_flags) {
 995                                 if (opt->clrmask ==
 996                                     (1 << REISERFS_UNSUPPORTED_OPT))
 997                                         reiserfs_warning(s, "super-6500",
 998                                                          "%s not supported.\n",
 999                                                          p);
1000                                 else
1001                                         *bit_flags &= ~opt->clrmask;
1002                                 if (opt->setmask ==
1003                                     (1 << REISERFS_UNSUPPORTED_OPT))
1004                                         reiserfs_warning(s, "super-6501",
1005                                                          "%s not supported.\n",
1006                                                          p);
1007                                 else
1008                                         *bit_flags |= opt->setmask;
1009                         }
1010                         break;
1011                 }
1012         }
1013         if (!opt->option_name) {
1014                 reiserfs_warning(s, "super-6502",
1015                                  "unknown mount option \"%s\"", p);
1016                 return -1;
1017         }
1018
1019         p += strlen(opt->option_name);
1020         switch (*p) {
1021         case '=':
1022                 if (!opt->arg_required) {
1023                         reiserfs_warning(s, "super-6503",
1024                                          "the option \"%s\" does not "
1025                                          "require an argument\n",
1026                                          opt->option_name);
1027                         return -1;
1028                 }
1029                 break;
1030
1031         case 0:
1032                 if (opt->arg_required) {
1033                         reiserfs_warning(s, "super-6504",
1034                                          "the option \"%s\" requires an "
1035                                          "argument\n", opt->option_name);
1036                         return -1;
1037                 }
1038                 break;
1039         default:
1040                 reiserfs_warning(s, "super-6505",
1041                                  "head of option \"%s\" is only correct\n",
1042                                  opt->option_name);
1043                 return -1;
1044         }
1045
1046         /*
1047          * move to the argument, or to next option if argument is not
1048          * required
1049          */
1050         p++;
1051
1052         if (opt->arg_required
1053             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1054             && !strlen(p)) {
1055                 /* this catches "option=," if not allowed */
1056                 reiserfs_warning(s, "super-6506",
1057                                  "empty argument for \"%s\"\n",
1058                                  opt->option_name);
1059                 return -1;
1060         }
1061
1062         if (!opt->values) {
1063                 /* *=NULLopt_arg contains pointer to argument */
1064                 *opt_arg = p;
1065                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1066         }
1067
1068         /* values possible for this option are listed in opt->values */
1069         for (arg = opt->values; arg->value; arg++) {
1070                 if (!strcmp(p, arg->value)) {
1071                         if (bit_flags) {
1072                                 *bit_flags &= ~arg->clrmask;
1073                                 *bit_flags |= arg->setmask;
1074                         }
1075                         return opt->arg_required;
1076                 }
1077         }
1078
1079         reiserfs_warning(s, "super-6506",
1080                          "bad value \"%s\" for option \"%s\"\n", p,
1081                          opt->option_name);
1082         return -1;
1083 }
1084
1085 /* returns 0 if something is wrong in option string, 1 - otherwise */
1086 static int reiserfs_parse_options(struct super_block *s,
1087
1088                                   /* string given via mount's -o */
1089                                   char *options,
1090
1091                                   /*
1092                                    * after the parsing phase, contains the
1093                                    * collection of bitflags defining what
1094                                    * mount options were selected.
1095                                    */
1096                                   unsigned long *mount_options,
1097
1098                                   /* strtol-ed from NNN of resize=NNN */
1099                                   unsigned long *blocks,
1100                                   char **jdev_name,
1101                                   unsigned int *commit_max_age,
1102                                   char **qf_names,
1103                                   unsigned int *qfmt)
1104 {
1105         int c;
1106         char *arg = NULL;
1107         char *pos;
1108         opt_desc_t opts[] = {
1109                 /*
1110                  * Compatibility stuff, so that -o notail for old
1111                  * setups still work
1112                  */
1113                 {"tails",.arg_required = 't',.values = tails},
1114                 {"notail",.clrmask =
1115                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1116                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1117                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1118                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1119                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1120 #ifdef CONFIG_REISERFS_FS_XATTR
1121                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1122                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1123 #else
1124                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1125                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1126 #endif
1127 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1128                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1129                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1130 #else
1131                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1132                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1133 #endif
1134                 {.option_name = "nolog"},
1135                 {"replayonly",.setmask = 1 << REPLAYONLY},
1136                 {"block-allocator",.arg_required = 'a',.values = balloc},
1137                 {"data",.arg_required = 'd',.values = logging_mode},
1138                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1139                 {"resize",.arg_required = 'r',.values = NULL},
1140                 {"jdev",.arg_required = 'j',.values = NULL},
1141                 {"nolargeio",.arg_required = 'w',.values = NULL},
1142                 {"commit",.arg_required = 'c',.values = NULL},
1143                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1144                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1145                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1146                 {"errors",.arg_required = 'e',.values = error_actions},
1147                 {"usrjquota",.arg_required =
1148                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1149                 {"grpjquota",.arg_required =
1150                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1151                 {"jqfmt",.arg_required = 'f',.values = NULL},
1152                 {.option_name = NULL}
1153         };
1154
1155         *blocks = 0;
1156         if (!options || !*options)
1157                 /*
1158                  * use default configuration: create tails, journaling on, no
1159                  * conversion to newest format
1160                  */
1161                 return 1;
1162
1163         for (pos = options; pos;) {
1164                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1165                 if (c == -1)
1166                         /* wrong option is given */
1167                         return 0;
1168
1169                 if (c == 'r') {
1170                         char *p;
1171
1172                         p = NULL;
1173                         /* "resize=NNN" or "resize=auto" */
1174
1175                         if (!strcmp(arg, "auto")) {
1176                                 /* From JFS code, to auto-get the size. */
1177                                 *blocks =
1178                                     s->s_bdev->bd_inode->i_size >> s->
1179                                     s_blocksize_bits;
1180                         } else {
1181                                 *blocks = simple_strtoul(arg, &p, 0);
1182                                 if (*p != '\0') {
1183                                         /* NNN does not look like a number */
1184                                         reiserfs_warning(s, "super-6507",
1185                                                          "bad value %s for "
1186                                                          "-oresize\n", arg);
1187                                         return 0;
1188                                 }
1189                         }
1190                 }
1191
1192                 if (c == 'c') {
1193                         char *p = NULL;
1194                         unsigned long val = simple_strtoul(arg, &p, 0);
1195                         /* commit=NNN (time in seconds) */
1196                         if (*p != '\0' || val >= (unsigned int)-1) {
1197                                 reiserfs_warning(s, "super-6508",
1198                                                  "bad value %s for -ocommit\n",
1199                                                  arg);
1200                                 return 0;
1201                         }
1202                         *commit_max_age = (unsigned int)val;
1203                 }
1204
1205                 if (c == 'w') {
1206                         reiserfs_warning(s, "super-6509", "nolargeio option "
1207                                          "is no longer supported");
1208                         return 0;
1209                 }
1210
1211                 if (c == 'j') {
1212                         if (arg && *arg && jdev_name) {
1213                                 /* Hm, already assigned? */
1214                                 if (*jdev_name) {
1215                                         reiserfs_warning(s, "super-6510",
1216                                                          "journal device was "
1217                                                          "already specified to "
1218                                                          "be %s", *jdev_name);
1219                                         return 0;
1220                                 }
1221                                 *jdev_name = arg;
1222                         }
1223                 }
1224 #ifdef CONFIG_QUOTA
1225                 if (c == 'u' || c == 'g') {
1226                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1227
1228                         if (sb_any_quota_loaded(s) &&
1229                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1230                                 reiserfs_warning(s, "super-6511",
1231                                                  "cannot change journaled "
1232                                                  "quota options when quota "
1233                                                  "turned on.");
1234                                 return 0;
1235                         }
1236                         if (*arg) {     /* Some filename specified? */
1237                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1238                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1239                                               arg)) {
1240                                         reiserfs_warning(s, "super-6512",
1241                                                          "%s quota file "
1242                                                          "already specified.",
1243                                                          QTYPE2NAME(qtype));
1244                                         return 0;
1245                                 }
1246                                 if (strchr(arg, '/')) {
1247                                         reiserfs_warning(s, "super-6513",
1248                                                          "quotafile must be "
1249                                                          "on filesystem root.");
1250                                         return 0;
1251                                 }
1252                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1253                                 if (!qf_names[qtype]) {
1254                                         reiserfs_warning(s, "reiserfs-2502",
1255                                                          "not enough memory "
1256                                                          "for storing "
1257                                                          "quotafile name.");
1258                                         return 0;
1259                                 }
1260                                 if (qtype == USRQUOTA)
1261                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1262                                 else
1263                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1264                         } else {
1265                                 if (qf_names[qtype] !=
1266                                     REISERFS_SB(s)->s_qf_names[qtype])
1267                                         kfree(qf_names[qtype]);
1268                                 qf_names[qtype] = NULL;
1269                                 if (qtype == USRQUOTA)
1270                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1271                                 else
1272                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1273                         }
1274                 }
1275                 if (c == 'f') {
1276                         if (!strcmp(arg, "vfsold"))
1277                                 *qfmt = QFMT_VFS_OLD;
1278                         else if (!strcmp(arg, "vfsv0"))
1279                                 *qfmt = QFMT_VFS_V0;
1280                         else {
1281                                 reiserfs_warning(s, "super-6514",
1282                                                  "unknown quota format "
1283                                                  "specified.");
1284                                 return 0;
1285                         }
1286                         if (sb_any_quota_loaded(s) &&
1287                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1288                                 reiserfs_warning(s, "super-6515",
1289                                                  "cannot change journaled "
1290                                                  "quota options when quota "
1291                                                  "turned on.");
1292                                 return 0;
1293                         }
1294                 }
1295 #else
1296                 if (c == 'u' || c == 'g' || c == 'f') {
1297                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1298                                          "quota options not supported.");
1299                         return 0;
1300                 }
1301 #endif
1302         }
1303
1304 #ifdef CONFIG_QUOTA
1305         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1306             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1307                 reiserfs_warning(s, "super-6515",
1308                                  "journaled quota format not specified.");
1309                 return 0;
1310         }
1311         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1312                sb_has_quota_loaded(s, USRQUOTA)) ||
1313             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1314                sb_has_quota_loaded(s, GRPQUOTA))) {
1315                 reiserfs_warning(s, "super-6516", "quota options must "
1316                                  "be present when quota is turned on.");
1317                 return 0;
1318         }
1319 #endif
1320
1321         return 1;
1322 }
1323
1324 static void switch_data_mode(struct super_block *s, unsigned long mode)
1325 {
1326         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1327                                          (1 << REISERFS_DATA_ORDERED) |
1328                                          (1 << REISERFS_DATA_WRITEBACK));
1329         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1330 }
1331
1332 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1333 {
1334         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1335                 if (!reiserfs_data_log(s)) {
1336                         switch_data_mode(s, REISERFS_DATA_LOG);
1337                         reiserfs_info(s, "switching to journaled data mode\n");
1338                 }
1339         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1340                 if (!reiserfs_data_ordered(s)) {
1341                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1342                         reiserfs_info(s, "switching to ordered data mode\n");
1343                 }
1344         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1345                 if (!reiserfs_data_writeback(s)) {
1346                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1347                         reiserfs_info(s, "switching to writeback data mode\n");
1348                 }
1349         }
1350 }
1351
1352 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1353 {
1354         int flush = (1 << REISERFS_BARRIER_FLUSH);
1355         int none = (1 << REISERFS_BARRIER_NONE);
1356         int all_barrier = flush | none;
1357
1358         if (bits & all_barrier) {
1359                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1360                 if (bits & flush) {
1361                         REISERFS_SB(s)->s_mount_opt |= flush;
1362                         printk("reiserfs: enabling write barrier flush mode\n");
1363                 } else if (bits & none) {
1364                         REISERFS_SB(s)->s_mount_opt |= none;
1365                         printk("reiserfs: write barriers turned off\n");
1366                 }
1367         }
1368 }
1369
1370 static void handle_attrs(struct super_block *s)
1371 {
1372         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1373
1374         if (reiserfs_attrs(s)) {
1375                 if (old_format_only(s)) {
1376                         reiserfs_warning(s, "super-6517", "cannot support "
1377                                          "attributes on 3.5.x disk format");
1378                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1379                         return;
1380                 }
1381                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1382                         reiserfs_warning(s, "super-6518", "cannot support "
1383                                          "attributes until flag is set in "
1384                                          "super-block");
1385                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1386                 }
1387         }
1388 }
1389
1390 #ifdef CONFIG_QUOTA
1391 static void handle_quota_files(struct super_block *s, char **qf_names,
1392                                unsigned int *qfmt)
1393 {
1394         int i;
1395
1396         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1397                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1398                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1399                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1400         }
1401         if (*qfmt)
1402                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1403 }
1404 #endif
1405
1406 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1407 {
1408         struct reiserfs_super_block *rs;
1409         struct reiserfs_transaction_handle th;
1410         unsigned long blocks;
1411         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1412         unsigned long safe_mask = 0;
1413         unsigned int commit_max_age = (unsigned int)-1;
1414         struct reiserfs_journal *journal = SB_JOURNAL(s);
1415         char *new_opts;
1416         int err;
1417         char *qf_names[REISERFS_MAXQUOTAS];
1418         unsigned int qfmt = 0;
1419 #ifdef CONFIG_QUOTA
1420         int i;
1421 #endif
1422
1423         new_opts = kstrdup(arg, GFP_KERNEL);
1424         if (arg && !new_opts)
1425                 return -ENOMEM;
1426
1427         sync_filesystem(s);
1428         reiserfs_write_lock(s);
1429
1430 #ifdef CONFIG_QUOTA
1431         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1432 #endif
1433
1434         rs = SB_DISK_SUPER_BLOCK(s);
1435
1436         if (!reiserfs_parse_options
1437             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1438             qf_names, &qfmt)) {
1439 #ifdef CONFIG_QUOTA
1440                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1441                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1442                                 kfree(qf_names[i]);
1443 #endif
1444                 err = -EINVAL;
1445                 goto out_err_unlock;
1446         }
1447 #ifdef CONFIG_QUOTA
1448         handle_quota_files(s, qf_names, &qfmt);
1449 #endif
1450
1451         handle_attrs(s);
1452
1453         /* Add options that are safe here */
1454         safe_mask |= 1 << REISERFS_SMALLTAIL;
1455         safe_mask |= 1 << REISERFS_LARGETAIL;
1456         safe_mask |= 1 << REISERFS_NO_BORDER;
1457         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1458         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1459         safe_mask |= 1 << REISERFS_TEST4;
1460         safe_mask |= 1 << REISERFS_ATTRS;
1461         safe_mask |= 1 << REISERFS_XATTRS_USER;
1462         safe_mask |= 1 << REISERFS_POSIXACL;
1463         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1464         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1465         safe_mask |= 1 << REISERFS_ERROR_RO;
1466         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1467         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1468         safe_mask |= 1 << REISERFS_USRQUOTA;
1469         safe_mask |= 1 << REISERFS_GRPQUOTA;
1470
1471         /*
1472          * Update the bitmask, taking care to keep
1473          * the bits we're not allowed to change here
1474          */
1475         REISERFS_SB(s)->s_mount_opt =
1476             (REISERFS_SB(s)->
1477              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1478
1479         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1480                 journal->j_max_commit_age = commit_max_age;
1481                 journal->j_max_trans_age = commit_max_age;
1482         } else if (commit_max_age == 0) {
1483                 /* 0 means restore defaults. */
1484                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1485                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1486         }
1487
1488         if (blocks) {
1489                 err = reiserfs_resize(s, blocks);
1490                 if (err != 0)
1491                         goto out_err_unlock;
1492         }
1493
1494         if (*mount_flags & MS_RDONLY) {
1495                 reiserfs_write_unlock(s);
1496                 reiserfs_xattr_init(s, *mount_flags);
1497                 /* remount read-only */
1498                 if (s->s_flags & MS_RDONLY)
1499                         /* it is read-only already */
1500                         goto out_ok_unlocked;
1501
1502                 err = dquot_suspend(s, -1);
1503                 if (err < 0)
1504                         goto out_err;
1505
1506                 /* try to remount file system with read-only permissions */
1507                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1508                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1509                         goto out_ok_unlocked;
1510                 }
1511
1512                 reiserfs_write_lock(s);
1513
1514                 err = journal_begin(&th, s, 10);
1515                 if (err)
1516                         goto out_err_unlock;
1517
1518                 /* Mounting a rw partition read-only. */
1519                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1520                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1521                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1522         } else {
1523                 /* remount read-write */
1524                 if (!(s->s_flags & MS_RDONLY)) {
1525                         reiserfs_write_unlock(s);
1526                         reiserfs_xattr_init(s, *mount_flags);
1527                         goto out_ok_unlocked;   /* We are read-write already */
1528                 }
1529
1530                 if (reiserfs_is_journal_aborted(journal)) {
1531                         err = journal->j_errno;
1532                         goto out_err_unlock;
1533                 }
1534
1535                 handle_data_mode(s, mount_options);
1536                 handle_barrier_mode(s, mount_options);
1537                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1538
1539                 /* now it is safe to call journal_begin */
1540                 s->s_flags &= ~MS_RDONLY;
1541                 err = journal_begin(&th, s, 10);
1542                 if (err)
1543                         goto out_err_unlock;
1544
1545                 /* Mount a partition which is read-only, read-write */
1546                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1547                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1548                 s->s_flags &= ~MS_RDONLY;
1549                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1550                 if (!old_format_only(s))
1551                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1552                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1553                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1554                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1555         }
1556         /* this will force a full flush of all journal lists */
1557         SB_JOURNAL(s)->j_must_wait = 1;
1558         err = journal_end(&th);
1559         if (err)
1560                 goto out_err_unlock;
1561
1562         reiserfs_write_unlock(s);
1563         if (!(*mount_flags & MS_RDONLY)) {
1564                 dquot_resume(s, -1);
1565                 reiserfs_write_lock(s);
1566                 finish_unfinished(s);
1567                 reiserfs_write_unlock(s);
1568                 reiserfs_xattr_init(s, *mount_flags);
1569         }
1570
1571 out_ok_unlocked:
1572         if (new_opts)
1573                 replace_mount_options(s, new_opts);
1574         return 0;
1575
1576 out_err_unlock:
1577         reiserfs_write_unlock(s);
1578 out_err:
1579         kfree(new_opts);
1580         return err;
1581 }
1582
1583 static int read_super_block(struct super_block *s, int offset)
1584 {
1585         struct buffer_head *bh;
1586         struct reiserfs_super_block *rs;
1587         int fs_blocksize;
1588
1589         bh = sb_bread(s, offset / s->s_blocksize);
1590         if (!bh) {
1591                 reiserfs_warning(s, "sh-2006",
1592                                  "bread failed (dev %s, block %lu, size %lu)",
1593                                  s->s_id, offset / s->s_blocksize,
1594                                  s->s_blocksize);
1595                 return 1;
1596         }
1597
1598         rs = (struct reiserfs_super_block *)bh->b_data;
1599         if (!is_any_reiserfs_magic_string(rs)) {
1600                 brelse(bh);
1601                 return 1;
1602         }
1603         /*
1604          * ok, reiserfs signature (old or new) found in at the given offset
1605          */
1606         fs_blocksize = sb_blocksize(rs);
1607         brelse(bh);
1608         sb_set_blocksize(s, fs_blocksize);
1609
1610         bh = sb_bread(s, offset / s->s_blocksize);
1611         if (!bh) {
1612                 reiserfs_warning(s, "sh-2007",
1613                                  "bread failed (dev %s, block %lu, size %lu)",
1614                                  s->s_id, offset / s->s_blocksize,
1615                                  s->s_blocksize);
1616                 return 1;
1617         }
1618
1619         rs = (struct reiserfs_super_block *)bh->b_data;
1620         if (sb_blocksize(rs) != s->s_blocksize) {
1621                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1622                                  "filesystem on (dev %s, block %llu, size %lu)",
1623                                  s->s_id,
1624                                  (unsigned long long)bh->b_blocknr,
1625                                  s->s_blocksize);
1626                 brelse(bh);
1627                 return 1;
1628         }
1629
1630         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1631                 brelse(bh);
1632                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1633                                  "--rebuild-tree run detected. Please run\n"
1634                                  "reiserfsck --rebuild-tree and wait for a "
1635                                  "completion. If that fails\n"
1636                                  "get newer reiserfsprogs package");
1637                 return 1;
1638         }
1639
1640         SB_BUFFER_WITH_SB(s) = bh;
1641         SB_DISK_SUPER_BLOCK(s) = rs;
1642
1643         /*
1644          * magic is of non-standard journal filesystem, look at s_version to
1645          * find which format is in use
1646          */
1647         if (is_reiserfs_jr(rs)) {
1648                 if (sb_version(rs) == REISERFS_VERSION_2)
1649                         reiserfs_info(s, "found reiserfs format \"3.6\""
1650                                       " with non-standard journal\n");
1651                 else if (sb_version(rs) == REISERFS_VERSION_1)
1652                         reiserfs_info(s, "found reiserfs format \"3.5\""
1653                                       " with non-standard journal\n");
1654                 else {
1655                         reiserfs_warning(s, "sh-2012", "found unknown "
1656                                          "format \"%u\" of reiserfs with "
1657                                          "non-standard magic", sb_version(rs));
1658                         return 1;
1659                 }
1660         } else
1661                 /*
1662                  * s_version of standard format may contain incorrect
1663                  * information, so we just look at the magic string
1664                  */
1665                 reiserfs_info(s,
1666                               "found reiserfs format \"%s\" with standard journal\n",
1667                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1668
1669         s->s_op = &reiserfs_sops;
1670         s->s_export_op = &reiserfs_export_ops;
1671 #ifdef CONFIG_QUOTA
1672         s->s_qcop = &reiserfs_qctl_operations;
1673         s->dq_op = &reiserfs_quota_operations;
1674         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1675 #endif
1676
1677         /*
1678          * new format is limited by the 32 bit wide i_blocks field, want to
1679          * be one full block below that.
1680          */
1681         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1682         return 0;
1683 }
1684
1685 /* after journal replay, reread all bitmap and super blocks */
1686 static int reread_meta_blocks(struct super_block *s)
1687 {
1688         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1689         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1690         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1691                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1692                 return 1;
1693         }
1694
1695         return 0;
1696 }
1697
1698 /* hash detection stuff */
1699
1700 /*
1701  * if root directory is empty - we set default - Yura's - hash and
1702  * warn about it
1703  * FIXME: we look for only one name in a directory. If tea and yura
1704  * both have the same value - we ask user to send report to the
1705  * mailing list
1706  */
1707 static __u32 find_hash_out(struct super_block *s)
1708 {
1709         int retval;
1710         struct inode *inode;
1711         struct cpu_key key;
1712         INITIALIZE_PATH(path);
1713         struct reiserfs_dir_entry de;
1714         struct reiserfs_de_head *deh;
1715         __u32 hash = DEFAULT_HASH;
1716         __u32 deh_hashval, teahash, r5hash, yurahash;
1717
1718         inode = d_inode(s->s_root);
1719
1720         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1721         retval = search_by_entry_key(s, &key, &path, &de);
1722         if (retval == IO_ERROR) {
1723                 pathrelse(&path);
1724                 return UNSET_HASH;
1725         }
1726         if (retval == NAME_NOT_FOUND)
1727                 de.de_entry_num--;
1728
1729         set_de_name_and_namelen(&de);
1730         deh = de.de_deh + de.de_entry_num;
1731
1732         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1733                 /* allow override in this case */
1734                 if (reiserfs_rupasov_hash(s))
1735                         hash = YURA_HASH;
1736                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1737                 goto out;
1738         }
1739
1740         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1741         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1742         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1743         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1744
1745         if ((teahash == r5hash && deh_hashval == r5hash) ||
1746             (teahash == yurahash && deh_hashval == yurahash) ||
1747             (r5hash == yurahash && deh_hashval == yurahash)) {
1748                 reiserfs_warning(s, "reiserfs-2506",
1749                                  "Unable to automatically detect hash "
1750                                  "function. Please mount with -o "
1751                                  "hash={tea,rupasov,r5}");
1752                 hash = UNSET_HASH;
1753                 goto out;
1754         }
1755
1756         if (deh_hashval == yurahash)
1757                 hash = YURA_HASH;
1758         else if (deh_hashval == teahash)
1759                 hash = TEA_HASH;
1760         else if (deh_hashval == r5hash)
1761                 hash = R5_HASH;
1762         else {
1763                 reiserfs_warning(s, "reiserfs-2506",
1764                                  "Unrecognised hash function");
1765                 hash = UNSET_HASH;
1766         }
1767 out:
1768         pathrelse(&path);
1769         return hash;
1770 }
1771
1772 /* finds out which hash names are sorted with */
1773 static int what_hash(struct super_block *s)
1774 {
1775         __u32 code;
1776
1777         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1778
1779         /*
1780          * reiserfs_hash_detect() == true if any of the hash mount options
1781          * were used.  We must check them to make sure the user isn't
1782          * using a bad hash value
1783          */
1784         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1785                 code = find_hash_out(s);
1786
1787         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1788                 /*
1789                  * detection has found the hash, and we must check against the
1790                  * mount options
1791                  */
1792                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1793                         reiserfs_warning(s, "reiserfs-2507",
1794                                          "Error, %s hash detected, "
1795                                          "unable to force rupasov hash",
1796                                          reiserfs_hashname(code));
1797                         code = UNSET_HASH;
1798                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1799                         reiserfs_warning(s, "reiserfs-2508",
1800                                          "Error, %s hash detected, "
1801                                          "unable to force tea hash",
1802                                          reiserfs_hashname(code));
1803                         code = UNSET_HASH;
1804                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1805                         reiserfs_warning(s, "reiserfs-2509",
1806                                          "Error, %s hash detected, "
1807                                          "unable to force r5 hash",
1808                                          reiserfs_hashname(code));
1809                         code = UNSET_HASH;
1810                 }
1811         } else {
1812                 /*
1813                  * find_hash_out was not called or
1814                  * could not determine the hash
1815                  */
1816                 if (reiserfs_rupasov_hash(s)) {
1817                         code = YURA_HASH;
1818                 } else if (reiserfs_tea_hash(s)) {
1819                         code = TEA_HASH;
1820                 } else if (reiserfs_r5_hash(s)) {
1821                         code = R5_HASH;
1822                 }
1823         }
1824
1825         /*
1826          * if we are mounted RW, and we have a new valid hash code, update
1827          * the super
1828          */
1829         if (code != UNSET_HASH &&
1830             !(s->s_flags & MS_RDONLY) &&
1831             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1832                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1833         }
1834         return code;
1835 }
1836
1837 /* return pointer to appropriate function */
1838 static hashf_t hash_function(struct super_block *s)
1839 {
1840         switch (what_hash(s)) {
1841         case TEA_HASH:
1842                 reiserfs_info(s, "Using tea hash to sort names\n");
1843                 return keyed_hash;
1844         case YURA_HASH:
1845                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1846                 return yura_hash;
1847         case R5_HASH:
1848                 reiserfs_info(s, "Using r5 hash to sort names\n");
1849                 return r5_hash;
1850         }
1851         return NULL;
1852 }
1853
1854 /* this is used to set up correct value for old partitions */
1855 static int function2code(hashf_t func)
1856 {
1857         if (func == keyed_hash)
1858                 return TEA_HASH;
1859         if (func == yura_hash)
1860                 return YURA_HASH;
1861         if (func == r5_hash)
1862                 return R5_HASH;
1863
1864         BUG();                  /* should never happen */
1865
1866         return 0;
1867 }
1868
1869 #define SWARN(silent, s, id, ...)                       \
1870         if (!(silent))                          \
1871                 reiserfs_warning(s, id, __VA_ARGS__)
1872
1873 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1874 {
1875         struct inode *root_inode;
1876         struct reiserfs_transaction_handle th;
1877         int old_format = 0;
1878         unsigned long blocks;
1879         unsigned int commit_max_age = 0;
1880         int jinit_done = 0;
1881         struct reiserfs_iget_args args;
1882         struct reiserfs_super_block *rs;
1883         char *jdev_name;
1884         struct reiserfs_sb_info *sbi;
1885         int errval = -EINVAL;
1886         char *qf_names[REISERFS_MAXQUOTAS] = {};
1887         unsigned int qfmt = 0;
1888
1889         save_mount_options(s, data);
1890
1891         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1892         if (!sbi)
1893                 return -ENOMEM;
1894         s->s_fs_info = sbi;
1895         /* Set default values for options: non-aggressive tails, RO on errors */
1896         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1897         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1898         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1899         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1900         sbi->s_alloc_options.preallocmin = 0;
1901         /* Preallocate by 16 blocks (17-1) at once */
1902         sbi->s_alloc_options.preallocsize = 17;
1903         /* setup default block allocator options */
1904         reiserfs_init_alloc_options(s);
1905
1906         spin_lock_init(&sbi->old_work_lock);
1907         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1908         mutex_init(&sbi->lock);
1909         sbi->lock_depth = -1;
1910
1911         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1912                                          s->s_id);
1913         if (!sbi->commit_wq) {
1914                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1915                 errval = -ENOMEM;
1916                 goto error_unlocked;
1917         }
1918
1919         jdev_name = NULL;
1920         if (reiserfs_parse_options
1921             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1922              &commit_max_age, qf_names, &qfmt) == 0) {
1923                 goto error_unlocked;
1924         }
1925         if (jdev_name && jdev_name[0]) {
1926                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1927                 if (!sbi->s_jdev) {
1928                         SWARN(silent, s, "", "Cannot allocate memory for "
1929                                 "journal device name");
1930                         goto error;
1931                 }
1932         }
1933 #ifdef CONFIG_QUOTA
1934         handle_quota_files(s, qf_names, &qfmt);
1935 #endif
1936
1937         if (blocks) {
1938                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1939                 goto error_unlocked;
1940         }
1941
1942         /*
1943          * try old format (undistributed bitmap, super block in 8-th 1k
1944          * block of a device)
1945          */
1946         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1947                 old_format = 1;
1948
1949         /*
1950          * try new format (64-th 1k block), which can contain reiserfs
1951          * super block
1952          */
1953         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1954                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1955                       s->s_id);
1956                 goto error_unlocked;
1957         }
1958
1959         rs = SB_DISK_SUPER_BLOCK(s);
1960         /*
1961          * Let's do basic sanity check to verify that underlying device is not
1962          * smaller than the filesystem. If the check fails then abort and
1963          * scream, because bad stuff will happen otherwise.
1964          */
1965         if (s->s_bdev && s->s_bdev->bd_inode
1966             && i_size_read(s->s_bdev->bd_inode) <
1967             sb_block_count(rs) * sb_blocksize(rs)) {
1968                 SWARN(silent, s, "", "Filesystem cannot be "
1969                       "mounted because it is bigger than the device");
1970                 SWARN(silent, s, "", "You may need to run fsck "
1971                       "or increase size of your LVM partition");
1972                 SWARN(silent, s, "", "Or may be you forgot to "
1973                       "reboot after fdisk when it told you to");
1974                 goto error_unlocked;
1975         }
1976
1977         sbi->s_mount_state = SB_REISERFS_STATE(s);
1978         sbi->s_mount_state = REISERFS_VALID_FS;
1979
1980         if ((errval = reiserfs_init_bitmap_cache(s))) {
1981                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1982                 goto error_unlocked;
1983         }
1984
1985         errval = -EINVAL;
1986 #ifdef CONFIG_REISERFS_CHECK
1987         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1988         SWARN(silent, s, "", "- it is slow mode for debugging.");
1989 #endif
1990
1991         /* make data=ordered the default */
1992         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1993             !reiserfs_data_writeback(s)) {
1994                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1995         }
1996
1997         if (reiserfs_data_log(s)) {
1998                 reiserfs_info(s, "using journaled data mode\n");
1999         } else if (reiserfs_data_ordered(s)) {
2000                 reiserfs_info(s, "using ordered data mode\n");
2001         } else {
2002                 reiserfs_info(s, "using writeback data mode\n");
2003         }
2004         if (reiserfs_barrier_flush(s)) {
2005                 printk("reiserfs: using flush barriers\n");
2006         }
2007
2008         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2009                 SWARN(silent, s, "sh-2022",
2010                       "unable to initialize journal space");
2011                 goto error_unlocked;
2012         } else {
2013                 /*
2014                  * once this is set, journal_release must be called
2015                  * if we error out of the mount
2016                  */
2017                 jinit_done = 1;
2018         }
2019
2020         if (reread_meta_blocks(s)) {
2021                 SWARN(silent, s, "jmacd-9",
2022                       "unable to reread meta blocks after journal init");
2023                 goto error_unlocked;
2024         }
2025
2026         if (replay_only(s))
2027                 goto error_unlocked;
2028
2029         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2030                 SWARN(silent, s, "clm-7000",
2031                       "Detected readonly device, marking FS readonly");
2032                 s->s_flags |= MS_RDONLY;
2033         }
2034         args.objectid = REISERFS_ROOT_OBJECTID;
2035         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2036         root_inode =
2037             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2038                          reiserfs_init_locked_inode, (void *)&args);
2039         if (!root_inode) {
2040                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2041                 goto error_unlocked;
2042         }
2043
2044         /*
2045          * This path assumed to be called with the BKL in the old times.
2046          * Now we have inherited the big reiserfs lock from it and many
2047          * reiserfs helpers called in the mount path and elsewhere require
2048          * this lock to be held even if it's not always necessary. Let's be
2049          * conservative and hold it early. The window can be reduced after
2050          * careful review of the code.
2051          */
2052         reiserfs_write_lock(s);
2053
2054         if (root_inode->i_state & I_NEW) {
2055                 reiserfs_read_locked_inode(root_inode, &args);
2056                 unlock_new_inode(root_inode);
2057         }
2058
2059         s->s_root = d_make_root(root_inode);
2060         if (!s->s_root)
2061                 goto error;
2062         /* define and initialize hash function */
2063         sbi->s_hash_function = hash_function(s);
2064         if (sbi->s_hash_function == NULL) {
2065                 dput(s->s_root);
2066                 s->s_root = NULL;
2067                 goto error;
2068         }
2069
2070         if (is_reiserfs_3_5(rs)
2071             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2072                 set_bit(REISERFS_3_5, &sbi->s_properties);
2073         else if (old_format)
2074                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2075         else
2076                 set_bit(REISERFS_3_6, &sbi->s_properties);
2077
2078         if (!(s->s_flags & MS_RDONLY)) {
2079
2080                 errval = journal_begin(&th, s, 1);
2081                 if (errval) {
2082                         dput(s->s_root);
2083                         s->s_root = NULL;
2084                         goto error;
2085                 }
2086                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2087
2088                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2089                 set_sb_fs_state(rs, 0);
2090
2091                 /*
2092                  * Clear out s_bmap_nr if it would wrap. We can handle this
2093                  * case, but older revisions can't. This will cause the
2094                  * file system to fail mount on those older implementations,
2095                  * avoiding corruption. -jeffm
2096                  */
2097                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2098                     sb_bmap_nr(rs) != 0) {
2099                         reiserfs_warning(s, "super-2030", "This file system "
2100                                         "claims to use %u bitmap blocks in "
2101                                         "its super block, but requires %u. "
2102                                         "Clearing to zero.", sb_bmap_nr(rs),
2103                                         reiserfs_bmap_count(s));
2104
2105                         set_sb_bmap_nr(rs, 0);
2106                 }
2107
2108                 if (old_format_only(s)) {
2109                         /*
2110                          * filesystem of format 3.5 either with standard
2111                          * or non-standard journal
2112                          */
2113                         if (convert_reiserfs(s)) {
2114                                 /* and -o conv is given */
2115                                 if (!silent)
2116                                         reiserfs_info(s,
2117                                                       "converting 3.5 filesystem to the 3.6 format");
2118
2119                                 if (is_reiserfs_3_5(rs))
2120                                         /*
2121                                          * put magic string of 3.6 format.
2122                                          * 2.2 will not be able to
2123                                          * mount this filesystem anymore
2124                                          */
2125                                         memcpy(rs->s_v1.s_magic,
2126                                                reiserfs_3_6_magic_string,
2127                                                sizeof
2128                                                (reiserfs_3_6_magic_string));
2129
2130                                 set_sb_version(rs, REISERFS_VERSION_2);
2131                                 reiserfs_convert_objectid_map_v1(s);
2132                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2133                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2134                         } else if (!silent) {
2135                                 reiserfs_info(s, "using 3.5.x disk format\n");
2136                         }
2137                 } else
2138                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2139
2140
2141                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2142                 errval = journal_end(&th);
2143                 if (errval) {
2144                         dput(s->s_root);
2145                         s->s_root = NULL;
2146                         goto error;
2147                 }
2148
2149                 reiserfs_write_unlock(s);
2150                 if ((errval = reiserfs_lookup_privroot(s)) ||
2151                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2152                         dput(s->s_root);
2153                         s->s_root = NULL;
2154                         goto error_unlocked;
2155                 }
2156                 reiserfs_write_lock(s);
2157
2158                 /*
2159                  * look for files which were to be removed in previous session
2160                  */
2161                 finish_unfinished(s);
2162         } else {
2163                 if (old_format_only(s) && !silent) {
2164                         reiserfs_info(s, "using 3.5.x disk format\n");
2165                 }
2166
2167                 reiserfs_write_unlock(s);
2168                 if ((errval = reiserfs_lookup_privroot(s)) ||
2169                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2170                         dput(s->s_root);
2171                         s->s_root = NULL;
2172                         goto error_unlocked;
2173                 }
2174                 reiserfs_write_lock(s);
2175         }
2176         /*
2177          * mark hash in super block: it could be unset. overwrite should be ok
2178          */
2179         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2180
2181         handle_attrs(s);
2182
2183         reiserfs_proc_info_init(s);
2184
2185         init_waitqueue_head(&(sbi->s_wait));
2186         spin_lock_init(&sbi->bitmap_lock);
2187
2188         reiserfs_write_unlock(s);
2189
2190         return (0);
2191
2192 error:
2193         reiserfs_write_unlock(s);
2194
2195 error_unlocked:
2196         /* kill the commit thread, free journal ram */
2197         if (jinit_done) {
2198                 reiserfs_write_lock(s);
2199                 journal_release_error(NULL, s);
2200                 reiserfs_write_unlock(s);
2201         }
2202
2203         if (sbi->commit_wq)
2204                 destroy_workqueue(sbi->commit_wq);
2205
2206         reiserfs_cancel_old_flush(s);
2207
2208         reiserfs_free_bitmap_cache(s);
2209         if (SB_BUFFER_WITH_SB(s))
2210                 brelse(SB_BUFFER_WITH_SB(s));
2211 #ifdef CONFIG_QUOTA
2212         {
2213                 int j;
2214                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2215                         kfree(qf_names[j]);
2216         }
2217 #endif
2218         kfree(sbi);
2219
2220         s->s_fs_info = NULL;
2221         return errval;
2222 }
2223
2224 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2225 {
2226         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2227
2228         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2229         buf->f_bfree = sb_free_blocks(rs);
2230         buf->f_bavail = buf->f_bfree;
2231         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2232         buf->f_bsize = dentry->d_sb->s_blocksize;
2233         /* changed to accommodate gcc folks. */
2234         buf->f_type = REISERFS_SUPER_MAGIC;
2235         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2236         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2237                                 sizeof(rs->s_uuid)/2);
2238
2239         return 0;
2240 }
2241
2242 #ifdef CONFIG_QUOTA
2243 static int reiserfs_write_dquot(struct dquot *dquot)
2244 {
2245         struct reiserfs_transaction_handle th;
2246         int ret, err;
2247         int depth;
2248
2249         reiserfs_write_lock(dquot->dq_sb);
2250         ret =
2251             journal_begin(&th, dquot->dq_sb,
2252                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2253         if (ret)
2254                 goto out;
2255         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2256         ret = dquot_commit(dquot);
2257         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2258         err = journal_end(&th);
2259         if (!ret && err)
2260                 ret = err;
2261 out:
2262         reiserfs_write_unlock(dquot->dq_sb);
2263         return ret;
2264 }
2265
2266 static int reiserfs_acquire_dquot(struct dquot *dquot)
2267 {
2268         struct reiserfs_transaction_handle th;
2269         int ret, err;
2270         int depth;
2271
2272         reiserfs_write_lock(dquot->dq_sb);
2273         ret =
2274             journal_begin(&th, dquot->dq_sb,
2275                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2276         if (ret)
2277                 goto out;
2278         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2279         ret = dquot_acquire(dquot);
2280         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2281         err = journal_end(&th);
2282         if (!ret && err)
2283                 ret = err;
2284 out:
2285         reiserfs_write_unlock(dquot->dq_sb);
2286         return ret;
2287 }
2288
2289 static int reiserfs_release_dquot(struct dquot *dquot)
2290 {
2291         struct reiserfs_transaction_handle th;
2292         int ret, err;
2293
2294         reiserfs_write_lock(dquot->dq_sb);
2295         ret =
2296             journal_begin(&th, dquot->dq_sb,
2297                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2298         reiserfs_write_unlock(dquot->dq_sb);
2299         if (ret) {
2300                 /* Release dquot anyway to avoid endless cycle in dqput() */
2301                 dquot_release(dquot);
2302                 goto out;
2303         }
2304         ret = dquot_release(dquot);
2305         reiserfs_write_lock(dquot->dq_sb);
2306         err = journal_end(&th);
2307         if (!ret && err)
2308                 ret = err;
2309         reiserfs_write_unlock(dquot->dq_sb);
2310 out:
2311         return ret;
2312 }
2313
2314 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2315 {
2316         /* Are we journaling quotas? */
2317         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2318             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2319                 dquot_mark_dquot_dirty(dquot);
2320                 return reiserfs_write_dquot(dquot);
2321         } else
2322                 return dquot_mark_dquot_dirty(dquot);
2323 }
2324
2325 static int reiserfs_write_info(struct super_block *sb, int type)
2326 {
2327         struct reiserfs_transaction_handle th;
2328         int ret, err;
2329         int depth;
2330
2331         /* Data block + inode block */
2332         reiserfs_write_lock(sb);
2333         ret = journal_begin(&th, sb, 2);
2334         if (ret)
2335                 goto out;
2336         depth = reiserfs_write_unlock_nested(sb);
2337         ret = dquot_commit_info(sb, type);
2338         reiserfs_write_lock_nested(sb, depth);
2339         err = journal_end(&th);
2340         if (!ret && err)
2341                 ret = err;
2342 out:
2343         reiserfs_write_unlock(sb);
2344         return ret;
2345 }
2346
2347 /*
2348  * Turn on quotas during mount time - we need to find the quota file and such...
2349  */
2350 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2351 {
2352         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2353                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2354 }
2355
2356 /*
2357  * Standard function to be called on quota_on
2358  */
2359 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2360                              struct path *path)
2361 {
2362         int err;
2363         struct inode *inode;
2364         struct reiserfs_transaction_handle th;
2365         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2366
2367         reiserfs_write_lock(sb);
2368         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2369                 err = -EINVAL;
2370                 goto out;
2371         }
2372
2373         /* Quotafile not on the same filesystem? */
2374         if (path->dentry->d_sb != sb) {
2375                 err = -EXDEV;
2376                 goto out;
2377         }
2378         inode = d_inode(path->dentry);
2379         /*
2380          * We must not pack tails for quota files on reiserfs for quota
2381          * IO to work
2382          */
2383         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2384                 err = reiserfs_unpack(inode, NULL);
2385                 if (err) {
2386                         reiserfs_warning(sb, "super-6520",
2387                                 "Unpacking tail of quota file failed"
2388                                 " (%d). Cannot turn on quotas.", err);
2389                         err = -EINVAL;
2390                         goto out;
2391                 }
2392                 mark_inode_dirty(inode);
2393         }
2394         /* Journaling quota? */
2395         if (REISERFS_SB(sb)->s_qf_names[type]) {
2396                 /* Quotafile not of fs root? */
2397                 if (path->dentry->d_parent != sb->s_root)
2398                         reiserfs_warning(sb, "super-6521",
2399                                  "Quota file not on filesystem root. "
2400                                  "Journalled quota will not work.");
2401         }
2402
2403         /*
2404          * When we journal data on quota file, we have to flush journal to see
2405          * all updates to the file when we bypass pagecache...
2406          */
2407         if (reiserfs_file_data_log(inode)) {
2408                 /* Just start temporary transaction and finish it */
2409                 err = journal_begin(&th, sb, 1);
2410                 if (err)
2411                         goto out;
2412                 err = journal_end_sync(&th);
2413                 if (err)
2414                         goto out;
2415         }
2416         reiserfs_write_unlock(sb);
2417         return dquot_quota_on(sb, type, format_id, path);
2418 out:
2419         reiserfs_write_unlock(sb);
2420         return err;
2421 }
2422
2423 /*
2424  * Read data from quotafile - avoid pagecache and such because we cannot afford
2425  * acquiring the locks... As quota files are never truncated and quota code
2426  * itself serializes the operations (and no one else should touch the files)
2427  * we don't have to be afraid of races
2428  */
2429 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2430                                    size_t len, loff_t off)
2431 {
2432         struct inode *inode = sb_dqopt(sb)->files[type];
2433         unsigned long blk = off >> sb->s_blocksize_bits;
2434         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2435         size_t toread;
2436         struct buffer_head tmp_bh, *bh;
2437         loff_t i_size = i_size_read(inode);
2438
2439         if (off > i_size)
2440                 return 0;
2441         if (off + len > i_size)
2442                 len = i_size - off;
2443         toread = len;
2444         while (toread > 0) {
2445                 tocopy =
2446                     sb->s_blocksize - offset <
2447                     toread ? sb->s_blocksize - offset : toread;
2448                 tmp_bh.b_state = 0;
2449                 /*
2450                  * Quota files are without tails so we can safely
2451                  * use this function
2452                  */
2453                 reiserfs_write_lock(sb);
2454                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2455                 reiserfs_write_unlock(sb);
2456                 if (err)
2457                         return err;
2458                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2459                         memset(data, 0, tocopy);
2460                 else {
2461                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2462                         if (!bh)
2463                                 return -EIO;
2464                         memcpy(data, bh->b_data + offset, tocopy);
2465                         brelse(bh);
2466                 }
2467                 offset = 0;
2468                 toread -= tocopy;
2469                 data += tocopy;
2470                 blk++;
2471         }
2472         return len;
2473 }
2474
2475 /*
2476  * Write to quotafile (we know the transaction is already started and has
2477  * enough credits)
2478  */
2479 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2480                                     const char *data, size_t len, loff_t off)
2481 {
2482         struct inode *inode = sb_dqopt(sb)->files[type];
2483         unsigned long blk = off >> sb->s_blocksize_bits;
2484         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2485         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2486         size_t towrite = len;
2487         struct buffer_head tmp_bh, *bh;
2488
2489         if (!current->journal_info) {
2490                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2491                         (unsigned long long)off, (unsigned long long)len);
2492                 return -EIO;
2493         }
2494         while (towrite > 0) {
2495                 tocopy = sb->s_blocksize - offset < towrite ?
2496                     sb->s_blocksize - offset : towrite;
2497                 tmp_bh.b_state = 0;
2498                 reiserfs_write_lock(sb);
2499                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2500                 reiserfs_write_unlock(sb);
2501                 if (err)
2502                         goto out;
2503                 if (offset || tocopy != sb->s_blocksize)
2504                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2505                 else
2506                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2507                 if (!bh) {
2508                         err = -EIO;
2509                         goto out;
2510                 }
2511                 lock_buffer(bh);
2512                 memcpy(bh->b_data + offset, data, tocopy);
2513                 flush_dcache_page(bh->b_page);
2514                 set_buffer_uptodate(bh);
2515                 unlock_buffer(bh);
2516                 reiserfs_write_lock(sb);
2517                 reiserfs_prepare_for_journal(sb, bh, 1);
2518                 journal_mark_dirty(current->journal_info, bh);
2519                 if (!journal_quota)
2520                         reiserfs_add_ordered_list(inode, bh);
2521                 reiserfs_write_unlock(sb);
2522                 brelse(bh);
2523                 offset = 0;
2524                 towrite -= tocopy;
2525                 data += tocopy;
2526                 blk++;
2527         }
2528 out:
2529         if (len == towrite)
2530                 return err;
2531         if (inode->i_size < off + len - towrite)
2532                 i_size_write(inode, off + len - towrite);
2533         inode->i_mtime = inode->i_ctime = current_time(inode);
2534         mark_inode_dirty(inode);
2535         return len - towrite;
2536 }
2537
2538 #endif
2539
2540 static struct dentry *get_super_block(struct file_system_type *fs_type,
2541                            int flags, const char *dev_name,
2542                            void *data)
2543 {
2544         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2545 }
2546
2547 static int __init init_reiserfs_fs(void)
2548 {
2549         int ret;
2550
2551         ret = init_inodecache();
2552         if (ret)
2553                 return ret;
2554
2555         reiserfs_proc_info_global_init();
2556
2557         ret = register_filesystem(&reiserfs_fs_type);
2558         if (ret)
2559                 goto out;
2560
2561         return 0;
2562 out:
2563         reiserfs_proc_info_global_done();
2564         destroy_inodecache();
2565
2566         return ret;
2567 }
2568
2569 static void __exit exit_reiserfs_fs(void)
2570 {
2571         reiserfs_proc_info_global_done();
2572         unregister_filesystem(&reiserfs_fs_type);
2573         destroy_inodecache();
2574 }
2575
2576 struct file_system_type reiserfs_fs_type = {
2577         .owner = THIS_MODULE,
2578         .name = "reiserfs",
2579         .mount = get_super_block,
2580         .kill_sb = reiserfs_kill_sb,
2581         .fs_flags = FS_REQUIRES_DEV,
2582 };
2583 MODULE_ALIAS_FS("reiserfs");
2584
2585 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2586 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2587 MODULE_LICENSE("GPL");
2588
2589 module_init(init_reiserfs_fs);
2590 module_exit(exit_reiserfs_fs);