fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <asm/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/buffer_head.h>
  25 #include <linux/exportfs.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/vfs.h>
  28 #include <linux/mount.h>
  29 #include <linux/namei.h>
  30 #include <linux/crc32.h>
  31 #include <linux/seq_file.h>
  32
  33 struct file_system_type reiserfs_fs_type;
  34
  35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  38
  39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  40 {
  41         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  42                         strlen(reiserfs_3_5_magic_string));
  43 }
  44
  45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  46 {
  47         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  48                         strlen(reiserfs_3_6_magic_string));
  49 }
  50
  51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  52 {
  53         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  54                         strlen(reiserfs_jr_magic_string));
  55 }
  56
  57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  58 {
  59         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  60                 is_reiserfs_jr(rs));
  61 }
  62
  63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  65 void show_alloc_options(struct seq_file *seq, struct super_block *s);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th, s, 1))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         sbi->work_queued = 0;
  94         spin_unlock(&sbi->old_work_lock);
  95
  96         reiserfs_sync_fs(s, 1);
  97 }
  98
  99 void reiserfs_schedule_old_flush(struct super_block *s)
 100 {
 101         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 102         unsigned long delay;
 103
 104         if (s->s_flags & MS_RDONLY)
 105                 return;
 106
 107         spin_lock(&sbi->old_work_lock);
 108         if (!sbi->work_queued) {
 109                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 110                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 111                 sbi->work_queued = 1;
 112         }
 113         spin_unlock(&sbi->old_work_lock);
 114 }
 115
 116 static void cancel_old_flush(struct super_block *s)
 117 {
 118         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 119
 120         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 121         spin_lock(&sbi->old_work_lock);
 122         sbi->work_queued = 0;
 123         spin_unlock(&sbi->old_work_lock);
 124 }
 125
 126 static int reiserfs_freeze(struct super_block *s)
 127 {
 128         struct reiserfs_transaction_handle th;
 129
 130         cancel_old_flush(s);
 131
 132         reiserfs_write_lock(s);
 133         if (!(s->s_flags & MS_RDONLY)) {
 134                 int err = journal_begin(&th, s, 1);
 135                 if (err) {
 136                         reiserfs_block_writes(&th);
 137                 } else {
 138                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 139                                                      1);
 140                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 141                         reiserfs_block_writes(&th);
 142                         journal_end_sync(&th, s, 1);
 143                 }
 144         }
 145         reiserfs_write_unlock(s);
 146         return 0;
 147 }
 148
 149 static int reiserfs_unfreeze(struct super_block *s)
 150 {
 151         reiserfs_allow_writes(s);
 152         return 0;
 153 }
 154
 155 extern const struct in_core_key MAX_IN_CORE_KEY;
 156
 157 /* this is used to delete "save link" when there are no items of a
 158    file it points to. It can either happen if unlink is completed but
 159    "save unlink" removal, or if file has both unlink and truncate
 160    pending and as unlink completes first (because key of "save link"
 161    protecting unlink is bigger that a key lf "save link" which
 162    protects truncate), so there left no items to make truncate
 163    completion on */
 164 static int remove_save_link_only(struct super_block *s,
 165                                  struct reiserfs_key *key, int oid_free)
 166 {
 167         struct reiserfs_transaction_handle th;
 168         int err;
 169
 170         /* we are going to do one balancing */
 171         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 172         if (err)
 173                 return err;
 174
 175         reiserfs_delete_solid_item(&th, NULL, key);
 176         if (oid_free)
 177                 /* removals are protected by direct items */
 178                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 179
 180         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 181 }
 182
 183 #ifdef CONFIG_QUOTA
 184 static int reiserfs_quota_on_mount(struct super_block *, int);
 185 #endif
 186
 187 /* look for uncompleted unlinks and truncates and complete them */
 188 static int finish_unfinished(struct super_block *s)
 189 {
 190         INITIALIZE_PATH(path);
 191         struct cpu_key max_cpu_key, obj_key;
 192         struct reiserfs_key save_link_key, last_inode_key;
 193         int retval = 0;
 194         struct item_head *ih;
 195         struct buffer_head *bh;
 196         int item_pos;
 197         char *item;
 198         int done;
 199         struct inode *inode;
 200         int truncate;
 201 #ifdef CONFIG_QUOTA
 202         int i;
 203         int ms_active_set;
 204         int quota_enabled[MAXQUOTAS];
 205 #endif
 206
 207         /* compose key to look for "save" links */
 208         max_cpu_key.version = KEY_FORMAT_3_5;
 209         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 210         max_cpu_key.on_disk_key.k_objectid = ~0U;
 211         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 212         max_cpu_key.key_length = 3;
 213
 214         memset(&last_inode_key, 0, sizeof(last_inode_key));
 215
 216 #ifdef CONFIG_QUOTA
 217         /* Needed for iput() to work correctly and not trash data */
 218         if (s->s_flags & MS_ACTIVE) {
 219                 ms_active_set = 0;
 220         } else {
 221                 ms_active_set = 1;
 222                 s->s_flags |= MS_ACTIVE;
 223         }
 224         /* Turn on quotas so that they are updated correctly */
 225         for (i = 0; i < MAXQUOTAS; i++) {
 226                 quota_enabled[i] = 1;
 227                 if (REISERFS_SB(s)->s_qf_names[i]) {
 228                         int ret;
 229
 230                         if (sb_has_quota_active(s, i)) {
 231                                 quota_enabled[i] = 0;
 232                                 continue;
 233                         }
 234                         ret = reiserfs_quota_on_mount(s, i);
 235                         if (ret < 0)
 236                                 reiserfs_warning(s, "reiserfs-2500",
 237                                                  "cannot turn on journaled "
 238                                                  "quota: error %d", ret);
 239                 }
 240         }
 241 #endif
 242
 243         done = 0;
 244         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 245         while (!retval) {
 246                 retval = search_item(s, &max_cpu_key, &path);
 247                 if (retval != ITEM_NOT_FOUND) {
 248                         reiserfs_error(s, "vs-2140",
 249                                        "search_by_key returned %d", retval);
 250                         break;
 251                 }
 252
 253                 bh = get_last_bh(&path);
 254                 item_pos = get_item_pos(&path);
 255                 if (item_pos != B_NR_ITEMS(bh)) {
 256                         reiserfs_warning(s, "vs-2060",
 257                                          "wrong position found");
 258                         break;
 259                 }
 260                 item_pos--;
 261                 ih = B_N_PITEM_HEAD(bh, item_pos);
 262
 263                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 264                         /* there are no "save" links anymore */
 265                         break;
 266
 267                 save_link_key = ih->ih_key;
 268                 if (is_indirect_le_ih(ih))
 269                         truncate = 1;
 270                 else
 271                         truncate = 0;
 272
 273                 /* reiserfs_iget needs k_dirid and k_objectid only */
 274                 item = B_I_PITEM(bh, ih);
 275                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 276                 obj_key.on_disk_key.k_objectid =
 277                     le32_to_cpu(ih->ih_key.k_objectid);
 278                 obj_key.on_disk_key.k_offset = 0;
 279                 obj_key.on_disk_key.k_type = 0;
 280
 281                 pathrelse(&path);
 282
 283                 inode = reiserfs_iget(s, &obj_key);
 284                 if (!inode) {
 285                         /* the unlink almost completed, it just did not manage to remove
 286                            "save" link and release objectid */
 287                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 288                                          &obj_key);
 289                         retval = remove_save_link_only(s, &save_link_key, 1);
 290                         continue;
 291                 }
 292
 293                 if (!truncate && inode->i_nlink) {
 294                         /* file is not unlinked */
 295                         reiserfs_warning(s, "vs-2185",
 296                                          "file %K is not unlinked",
 297                                          &obj_key);
 298                         retval = remove_save_link_only(s, &save_link_key, 0);
 299                         continue;
 300                 }
 301                 reiserfs_write_unlock(s);
 302                 dquot_initialize(inode);
 303                 reiserfs_write_lock(s);
 304
 305                 if (truncate && S_ISDIR(inode->i_mode)) {
 306                         /* We got a truncate request for a dir which is impossible.
 307                            The only imaginable way is to execute unfinished truncate request
 308                            then boot into old kernel, remove the file and create dir with
 309                            the same key. */
 310                         reiserfs_warning(s, "green-2101",
 311                                          "impossible truncate on a "
 312                                          "directory %k. Please report",
 313                                          INODE_PKEY(inode));
 314                         retval = remove_save_link_only(s, &save_link_key, 0);
 315                         truncate = 0;
 316                         iput(inode);
 317                         continue;
 318                 }
 319
 320                 if (truncate) {
 321                         REISERFS_I(inode)->i_flags |=
 322                             i_link_saved_truncate_mask;
 323                         /* not completed truncate found. New size was committed together
 324                            with "save" link */
 325                         reiserfs_info(s, "Truncating %k to %Ld ..",
 326                                       INODE_PKEY(inode), inode->i_size);
 327                         reiserfs_truncate_file(inode,
 328                                                0
 329                                                /*don't update modification time */
 330                                                );
 331                         retval = remove_save_link(inode, truncate);
 332                 } else {
 333                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 334                         /* not completed unlink (rmdir) found */
 335                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 336                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 337                                         sizeof(last_inode_key))){
 338                                 last_inode_key = *INODE_PKEY(inode);
 339                                 /* removal gets completed in iput */
 340                                 retval = 0;
 341                         } else {
 342                                 reiserfs_warning(s, "super-2189", "Dead loop "
 343                                                  "in finish_unfinished "
 344                                                  "detected, just remove "
 345                                                  "save link\n");
 346                                 retval = remove_save_link_only(s,
 347                                                         &save_link_key, 0);
 348                         }
 349                 }
 350
 351                 iput(inode);
 352                 printk("done\n");
 353                 done++;
 354         }
 355         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 356
 357 #ifdef CONFIG_QUOTA
 358         /* Turn quotas off */
 359         for (i = 0; i < MAXQUOTAS; i++) {
 360                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 361                         dquot_quota_off(s, i);
 362         }
 363         if (ms_active_set)
 364                 /* Restore the flag back */
 365                 s->s_flags &= ~MS_ACTIVE;
 366 #endif
 367         pathrelse(&path);
 368         if (done)
 369                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 370                               "Completed\n", done);
 371         return retval;
 372 }
 373
 374 /* to protect file being unlinked from getting lost we "safe" link files
 375    being unlinked. This link will be deleted in the same transaction with last
 376    item of file. mounting the filesystem we scan all these links and remove
 377    files which almost got lost */
 378 void add_save_link(struct reiserfs_transaction_handle *th,
 379                    struct inode *inode, int truncate)
 380 {
 381         INITIALIZE_PATH(path);
 382         int retval;
 383         struct cpu_key key;
 384         struct item_head ih;
 385         __le32 link;
 386
 387         BUG_ON(!th->t_trans_id);
 388
 389         /* file can only get one "save link" of each kind */
 390         RFALSE(truncate &&
 391                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 392                "saved link already exists for truncated inode %lx",
 393                (long)inode->i_ino);
 394         RFALSE(!truncate &&
 395                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 396                "saved link already exists for unlinked inode %lx",
 397                (long)inode->i_ino);
 398
 399         /* setup key of "save" link */
 400         key.version = KEY_FORMAT_3_5;
 401         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 402         key.on_disk_key.k_objectid = inode->i_ino;
 403         if (!truncate) {
 404                 /* unlink, rmdir, rename */
 405                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 406                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 407
 408                 /* item head of "safe" link */
 409                 make_le_item_head(&ih, &key, key.version,
 410                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 411                                   4 /*length */ , 0xffff /*free space */ );
 412         } else {
 413                 /* truncate */
 414                 if (S_ISDIR(inode->i_mode))
 415                         reiserfs_warning(inode->i_sb, "green-2102",
 416                                          "Adding a truncate savelink for "
 417                                          "a directory %k! Please report",
 418                                          INODE_PKEY(inode));
 419                 set_cpu_key_k_offset(&key, 1);
 420                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 421
 422                 /* item head of "safe" link */
 423                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 424                                   4 /*length */ , 0 /*free space */ );
 425         }
 426         key.key_length = 3;
 427
 428         /* look for its place in the tree */
 429         retval = search_item(inode->i_sb, &key, &path);
 430         if (retval != ITEM_NOT_FOUND) {
 431                 if (retval != -ENOSPC)
 432                         reiserfs_error(inode->i_sb, "vs-2100",
 433                                        "search_by_key (%K) returned %d", &key,
 434                                        retval);
 435                 pathrelse(&path);
 436                 return;
 437         }
 438
 439         /* body of "save" link */
 440         link = INODE_PKEY(inode)->k_dir_id;
 441
 442         /* put "save" link into tree, don't charge quota to anyone */
 443         retval =
 444             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 445         if (retval) {
 446                 if (retval != -ENOSPC)
 447                         reiserfs_error(inode->i_sb, "vs-2120",
 448                                        "insert_item returned %d", retval);
 449         } else {
 450                 if (truncate)
 451                         REISERFS_I(inode)->i_flags |=
 452                             i_link_saved_truncate_mask;
 453                 else
 454                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 455         }
 456 }
 457
 458 /* this opens transaction unlike add_save_link */
 459 int remove_save_link(struct inode *inode, int truncate)
 460 {
 461         struct reiserfs_transaction_handle th;
 462         struct reiserfs_key key;
 463         int err;
 464
 465         /* we are going to do one balancing only */
 466         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 467         if (err)
 468                 return err;
 469
 470         /* setup key of "save" link */
 471         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 472         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 473         if (!truncate) {
 474                 /* unlink, rmdir, rename */
 475                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 476                                     1 + inode->i_sb->s_blocksize);
 477                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 478         } else {
 479                 /* truncate */
 480                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 481                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 482         }
 483
 484         if ((truncate &&
 485              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 486             (!truncate &&
 487              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 488                 /* don't take quota bytes from anywhere */
 489                 reiserfs_delete_solid_item(&th, NULL, &key);
 490         if (!truncate) {
 491                 reiserfs_release_objectid(&th, inode->i_ino);
 492                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 493         } else
 494                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 495
 496         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 497 }
 498
 499 static void reiserfs_kill_sb(struct super_block *s)
 500 {
 501         if (REISERFS_SB(s)) {
 502                 /*
 503                  * Force any pending inode evictions to occur now. Any
 504                  * inodes to be removed that have extended attributes
 505                  * associated with them need to clean them up before
 506                  * we can release the extended attribute root dentries.
 507                  * shrink_dcache_for_umount will BUG if we don't release
 508                  * those before it's called so ->put_super is too late.
 509                  */
 510                 shrink_dcache_sb(s);
 511
 512                 dput(REISERFS_SB(s)->xattr_root);
 513                 REISERFS_SB(s)->xattr_root = NULL;
 514                 dput(REISERFS_SB(s)->priv_root);
 515                 REISERFS_SB(s)->priv_root = NULL;
 516         }
 517
 518         kill_block_super(s);
 519 }
 520
 521 static void reiserfs_put_super(struct super_block *s)
 522 {
 523         struct reiserfs_transaction_handle th;
 524         th.t_trans_id = 0;
 525
 526         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 527
 528         reiserfs_write_lock(s);
 529
 530         /* change file system state to current state if it was mounted with read-write permissions */
 531         if (!(s->s_flags & MS_RDONLY)) {
 532                 if (!journal_begin(&th, s, 10)) {
 533                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 534                                                      1);
 535                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 536                                             REISERFS_SB(s)->s_mount_state);
 537                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 538                 }
 539         }
 540
 541         /* note, journal_release checks for readonly mount, and can decide not
 542          ** to do a journal_end
 543          */
 544         journal_release(&th, s);
 545
 546         reiserfs_free_bitmap_cache(s);
 547
 548         brelse(SB_BUFFER_WITH_SB(s));
 549
 550         print_statistics(s);
 551
 552         if (REISERFS_SB(s)->reserved_blocks != 0) {
 553                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 554                                  REISERFS_SB(s)->reserved_blocks);
 555         }
 556
 557         reiserfs_proc_info_done(s);
 558
 559         reiserfs_write_unlock(s);
 560         mutex_destroy(&REISERFS_SB(s)->lock);
 561         kfree(s->s_fs_info);
 562         s->s_fs_info = NULL;
 563 }
 564
 565 static struct kmem_cache *reiserfs_inode_cachep;
 566
 567 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 568 {
 569         struct reiserfs_inode_info *ei;
 570         ei = (struct reiserfs_inode_info *)
 571             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 572         if (!ei)
 573                 return NULL;
 574         atomic_set(&ei->openers, 0);
 575         mutex_init(&ei->tailpack);
 576         return &ei->vfs_inode;
 577 }
 578
 579 static void reiserfs_i_callback(struct rcu_head *head)
 580 {
 581         struct inode *inode = container_of(head, struct inode, i_rcu);
 582         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 583 }
 584
 585 static void reiserfs_destroy_inode(struct inode *inode)
 586 {
 587         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 588 }
 589
 590 static void init_once(void *foo)
 591 {
 592         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 593
 594         INIT_LIST_HEAD(&ei->i_prealloc_list);
 595         inode_init_once(&ei->vfs_inode);
 596 }
 597
 598 static int init_inodecache(void)
 599 {
 600         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 601                                                   sizeof(struct
 602                                                          reiserfs_inode_info),
 603                                                   0, (SLAB_RECLAIM_ACCOUNT|
 604                                                         SLAB_MEM_SPREAD),
 605                                                   init_once);
 606         if (reiserfs_inode_cachep == NULL)
 607                 return -ENOMEM;
 608         return 0;
 609 }
 610
 611 static void destroy_inodecache(void)
 612 {
 613         /*
 614          * Make sure all delayed rcu free inodes are flushed before we
 615          * destroy cache.
 616          */
 617         rcu_barrier();
 618         kmem_cache_destroy(reiserfs_inode_cachep);
 619 }
 620
 621 /* we don't mark inodes dirty, we just log them */
 622 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 623 {
 624         struct reiserfs_transaction_handle th;
 625
 626         int err = 0;
 627         int lock_depth;
 628
 629         if (inode->i_sb->s_flags & MS_RDONLY) {
 630                 reiserfs_warning(inode->i_sb, "clm-6006",
 631                                  "writing inode %lu on readonly FS",
 632                                  inode->i_ino);
 633                 return;
 634         }
 635         lock_depth = reiserfs_write_lock_once(inode->i_sb);
 636
 637         /* this is really only used for atime updates, so they don't have
 638          ** to be included in O_SYNC or fsync
 639          */
 640         err = journal_begin(&th, inode->i_sb, 1);
 641         if (err)
 642                 goto out;
 643
 644         reiserfs_update_sd(&th, inode);
 645         journal_end(&th, inode->i_sb, 1);
 646
 647 out:
 648         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 649 }
 650
 651 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 652 {
 653         struct super_block *s = root->d_sb;
 654         struct reiserfs_journal *journal = SB_JOURNAL(s);
 655         long opts = REISERFS_SB(s)->s_mount_opt;
 656
 657         if (opts & (1 << REISERFS_LARGETAIL))
 658                 seq_puts(seq, ",tails=on");
 659         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 660                 seq_puts(seq, ",notail");
 661         /* tails=small is default so we don't show it */
 662
 663         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 664                 seq_puts(seq, ",barrier=none");
 665         /* barrier=flush is default so we don't show it */
 666
 667         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 668                 seq_puts(seq, ",errors=continue");
 669         else if (opts & (1 << REISERFS_ERROR_PANIC))
 670                 seq_puts(seq, ",errors=panic");
 671         /* errors=ro is default so we don't show it */
 672
 673         if (opts & (1 << REISERFS_DATA_LOG))
 674                 seq_puts(seq, ",data=journal");
 675         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 676                 seq_puts(seq, ",data=writeback");
 677         /* data=ordered is default so we don't show it */
 678
 679         if (opts & (1 << REISERFS_ATTRS))
 680                 seq_puts(seq, ",attrs");
 681
 682         if (opts & (1 << REISERFS_XATTRS_USER))
 683                 seq_puts(seq, ",user_xattr");
 684
 685         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 686                 seq_puts(seq, ",expose_privroot");
 687
 688         if (opts & (1 << REISERFS_POSIXACL))
 689                 seq_puts(seq, ",acl");
 690
 691         if (REISERFS_SB(s)->s_jdev)
 692                 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 693
 694         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 695                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 696
 697 #ifdef CONFIG_QUOTA
 698         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 699                 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 700         else if (opts & (1 << REISERFS_USRQUOTA))
 701                 seq_puts(seq, ",usrquota");
 702         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 703                 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 704         else if (opts & (1 << REISERFS_GRPQUOTA))
 705                 seq_puts(seq, ",grpquota");
 706         if (REISERFS_SB(s)->s_jquota_fmt) {
 707                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 708                         seq_puts(seq, ",jqfmt=vfsold");
 709                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 710                         seq_puts(seq, ",jqfmt=vfsv0");
 711         }
 712 #endif
 713
 714         /* Block allocator options */
 715         if (opts & (1 << REISERFS_NO_BORDER))
 716                 seq_puts(seq, ",block-allocator=noborder");
 717         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 718                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 719         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 720                 seq_puts(seq, ",block-allocator=hashed_relocation");
 721         if (opts & (1 << REISERFS_TEST4))
 722                 seq_puts(seq, ",block-allocator=test4");
 723         show_alloc_options(seq, s);
 724         return 0;
 725 }
 726
 727 #ifdef CONFIG_QUOTA
 728 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 729                                     size_t, loff_t);
 730 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 731                                    loff_t);
 732 #endif
 733
 734 static const struct super_operations reiserfs_sops = {
 735         .alloc_inode = reiserfs_alloc_inode,
 736         .destroy_inode = reiserfs_destroy_inode,
 737         .write_inode = reiserfs_write_inode,
 738         .dirty_inode = reiserfs_dirty_inode,
 739         .evict_inode = reiserfs_evict_inode,
 740         .put_super = reiserfs_put_super,
 741         .sync_fs = reiserfs_sync_fs,
 742         .freeze_fs = reiserfs_freeze,
 743         .unfreeze_fs = reiserfs_unfreeze,
 744         .statfs = reiserfs_statfs,
 745         .remount_fs = reiserfs_remount,
 746         .show_options = reiserfs_show_options,
 747 #ifdef CONFIG_QUOTA
 748         .quota_read = reiserfs_quota_read,
 749         .quota_write = reiserfs_quota_write,
 750 #endif
 751 };
 752
 753 #ifdef CONFIG_QUOTA
 754 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 755
 756 static int reiserfs_write_dquot(struct dquot *);
 757 static int reiserfs_acquire_dquot(struct dquot *);
 758 static int reiserfs_release_dquot(struct dquot *);
 759 static int reiserfs_mark_dquot_dirty(struct dquot *);
 760 static int reiserfs_write_info(struct super_block *, int);
 761 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 762
 763 static const struct dquot_operations reiserfs_quota_operations = {
 764         .write_dquot = reiserfs_write_dquot,
 765         .acquire_dquot = reiserfs_acquire_dquot,
 766         .release_dquot = reiserfs_release_dquot,
 767         .mark_dirty = reiserfs_mark_dquot_dirty,
 768         .write_info = reiserfs_write_info,
 769         .alloc_dquot    = dquot_alloc,
 770         .destroy_dquot  = dquot_destroy,
 771 };
 772
 773 static const struct quotactl_ops reiserfs_qctl_operations = {
 774         .quota_on = reiserfs_quota_on,
 775         .quota_off = dquot_quota_off,
 776         .quota_sync = dquot_quota_sync,
 777         .get_info = dquot_get_dqinfo,
 778         .set_info = dquot_set_dqinfo,
 779         .get_dqblk = dquot_get_dqblk,
 780         .set_dqblk = dquot_set_dqblk,
 781 };
 782 #endif
 783
 784 static const struct export_operations reiserfs_export_ops = {
 785         .encode_fh = reiserfs_encode_fh,
 786         .fh_to_dentry = reiserfs_fh_to_dentry,
 787         .fh_to_parent = reiserfs_fh_to_parent,
 788         .get_parent = reiserfs_get_parent,
 789 };
 790
 791 /* this struct is used in reiserfs_getopt () for containing the value for those
 792    mount options that have values rather than being toggles. */
 793 typedef struct {
 794         char *value;
 795         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 796                                    value is found, 0 is no bits are to be changed. */
 797         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 798                                    value is found, 0 is no bits are to be changed. This is
 799                                    applied BEFORE setmask */
 800 } arg_desc_t;
 801
 802 /* Set this bit in arg_required to allow empty arguments */
 803 #define REISERFS_OPT_ALLOWEMPTY 31
 804
 805 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 806    mount options */
 807 typedef struct {
 808         char *option_name;
 809         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 810         const arg_desc_t *values;       /* list of values accepted by an option */
 811         int setmask;            /* bitmask which is to set on mount_options bitmask when this
 812                                    value is found, 0 is no bits are to be changed. */
 813         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 814                                    value is found, 0 is no bits are to be changed. This is
 815                                    applied BEFORE setmask */
 816 } opt_desc_t;
 817
 818 /* possible values for -o data= */
 819 static const arg_desc_t logging_mode[] = {
 820         {"ordered", 1 << REISERFS_DATA_ORDERED,
 821          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 822         {"journal", 1 << REISERFS_DATA_LOG,
 823          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 824         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 825          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 826         {.value = NULL}
 827 };
 828
 829 /* possible values for -o barrier= */
 830 static const arg_desc_t barrier_mode[] = {
 831         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 832         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 833         {.value = NULL}
 834 };
 835
 836 /* possible values for "-o block-allocator=" and bits which are to be set in
 837    s_mount_opt of reiserfs specific part of in-core super block */
 838 static const arg_desc_t balloc[] = {
 839         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 840         {"border", 0, 1 << REISERFS_NO_BORDER},
 841         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 842         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 843         {"test4", 1 << REISERFS_TEST4, 0},
 844         {"notest4", 0, 1 << REISERFS_TEST4},
 845         {NULL, 0, 0}
 846 };
 847
 848 static const arg_desc_t tails[] = {
 849         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 850         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 851         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 852         {NULL, 0, 0}
 853 };
 854
 855 static const arg_desc_t error_actions[] = {
 856         {"panic", 1 << REISERFS_ERROR_PANIC,
 857          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 858         {"ro-remount", 1 << REISERFS_ERROR_RO,
 859          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 860 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 861         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 862          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 863 #endif
 864         {NULL, 0, 0},
 865 };
 866
 867 /* proceed only one option from a list *cur - string containing of mount options
 868    opts - array of options which are accepted
 869    opt_arg - if option is found and requires an argument and if it is specifed
 870    in the input - pointer to the argument is stored here
 871    bit_flags - if option requires to set a certain bit - it is set here
 872    return -1 if unknown option is found, opt->arg_required otherwise */
 873 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 874                            char **opt_arg, unsigned long *bit_flags)
 875 {
 876         char *p;
 877         /* foo=bar,
 878            ^   ^  ^
 879            |   |  +-- option_end
 880            |   +-- arg_start
 881            +-- option_start
 882          */
 883         const opt_desc_t *opt;
 884         const arg_desc_t *arg;
 885
 886         p = *cur;
 887
 888         /* assume argument cannot contain commas */
 889         *cur = strchr(p, ',');
 890         if (*cur) {
 891                 *(*cur) = '\0';
 892                 (*cur)++;
 893         }
 894
 895         if (!strncmp(p, "alloc=", 6)) {
 896                 /* Ugly special case, probably we should redo options parser so that
 897                    it can understand several arguments for some options, also so that
 898                    it can fill several bitfields with option values. */
 899                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 900                         return -1;
 901                 } else {
 902                         return 0;
 903                 }
 904         }
 905
 906         /* for every option in the list */
 907         for (opt = opts; opt->option_name; opt++) {
 908                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 909                         if (bit_flags) {
 910                                 if (opt->clrmask ==
 911                                     (1 << REISERFS_UNSUPPORTED_OPT))
 912                                         reiserfs_warning(s, "super-6500",
 913                                                          "%s not supported.\n",
 914                                                          p);
 915                                 else
 916                                         *bit_flags &= ~opt->clrmask;
 917                                 if (opt->setmask ==
 918                                     (1 << REISERFS_UNSUPPORTED_OPT))
 919                                         reiserfs_warning(s, "super-6501",
 920                                                          "%s not supported.\n",
 921                                                          p);
 922                                 else
 923                                         *bit_flags |= opt->setmask;
 924                         }
 925                         break;
 926                 }
 927         }
 928         if (!opt->option_name) {
 929                 reiserfs_warning(s, "super-6502",
 930                                  "unknown mount option \"%s\"", p);
 931                 return -1;
 932         }
 933
 934         p += strlen(opt->option_name);
 935         switch (*p) {
 936         case '=':
 937                 if (!opt->arg_required) {
 938                         reiserfs_warning(s, "super-6503",
 939                                          "the option \"%s\" does not "
 940                                          "require an argument\n",
 941                                          opt->option_name);
 942                         return -1;
 943                 }
 944                 break;
 945
 946         case 0:
 947                 if (opt->arg_required) {
 948                         reiserfs_warning(s, "super-6504",
 949                                          "the option \"%s\" requires an "
 950                                          "argument\n", opt->option_name);
 951                         return -1;
 952                 }
 953                 break;
 954         default:
 955                 reiserfs_warning(s, "super-6505",
 956                                  "head of option \"%s\" is only correct\n",
 957                                  opt->option_name);
 958                 return -1;
 959         }
 960
 961         /* move to the argument, or to next option if argument is not required */
 962         p++;
 963
 964         if (opt->arg_required
 965             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 966             && !strlen(p)) {
 967                 /* this catches "option=," if not allowed */
 968                 reiserfs_warning(s, "super-6506",
 969                                  "empty argument for \"%s\"\n",
 970                                  opt->option_name);
 971                 return -1;
 972         }
 973
 974         if (!opt->values) {
 975                 /* *=NULLopt_arg contains pointer to argument */
 976                 *opt_arg = p;
 977                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 978         }
 979
 980         /* values possible for this option are listed in opt->values */
 981         for (arg = opt->values; arg->value; arg++) {
 982                 if (!strcmp(p, arg->value)) {
 983                         if (bit_flags) {
 984                                 *bit_flags &= ~arg->clrmask;
 985                                 *bit_flags |= arg->setmask;
 986                         }
 987                         return opt->arg_required;
 988                 }
 989         }
 990
 991         reiserfs_warning(s, "super-6506",
 992                          "bad value \"%s\" for option \"%s\"\n", p,
 993                          opt->option_name);
 994         return -1;
 995 }
 996
 997 /* returns 0 if something is wrong in option string, 1 - otherwise */
 998 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 999                                   unsigned long *mount_options,
1000                                   /* after the parsing phase, contains the
1001                                      collection of bitflags defining what
1002                                      mount options were selected. */
1003                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
1004                                   char **jdev_name,
1005                                   unsigned int *commit_max_age,
1006                                   char **qf_names,
1007                                   unsigned int *qfmt)
1008 {
1009         int c;
1010         char *arg = NULL;
1011         char *pos;
1012         opt_desc_t opts[] = {
1013                 /* Compatibility stuff, so that -o notail for old setups still work */
1014                 {"tails",.arg_required = 't',.values = tails},
1015                 {"notail",.clrmask =
1016                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1017                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1018                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1019                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1020                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1021 #ifdef CONFIG_REISERFS_FS_XATTR
1022                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1023                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1024 #else
1025                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027 #endif
1028 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1029                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1030                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1031 #else
1032                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034 #endif
1035                 {.option_name = "nolog"},
1036                 {"replayonly",.setmask = 1 << REPLAYONLY},
1037                 {"block-allocator",.arg_required = 'a',.values = balloc},
1038                 {"data",.arg_required = 'd',.values = logging_mode},
1039                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1040                 {"resize",.arg_required = 'r',.values = NULL},
1041                 {"jdev",.arg_required = 'j',.values = NULL},
1042                 {"nolargeio",.arg_required = 'w',.values = NULL},
1043                 {"commit",.arg_required = 'c',.values = NULL},
1044                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1045                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1046                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1047                 {"errors",.arg_required = 'e',.values = error_actions},
1048                 {"usrjquota",.arg_required =
1049                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050                 {"grpjquota",.arg_required =
1051                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1052                 {"jqfmt",.arg_required = 'f',.values = NULL},
1053                 {.option_name = NULL}
1054         };
1055
1056         *blocks = 0;
1057         if (!options || !*options)
1058                 /* use default configuration: create tails, journaling on, no
1059                    conversion to newest format */
1060                 return 1;
1061
1062         for (pos = options; pos;) {
1063                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1064                 if (c == -1)
1065                         /* wrong option is given */
1066                         return 0;
1067
1068                 if (c == 'r') {
1069                         char *p;
1070
1071                         p = NULL;
1072                         /* "resize=NNN" or "resize=auto" */
1073
1074                         if (!strcmp(arg, "auto")) {
1075                                 /* From JFS code, to auto-get the size. */
1076                                 *blocks =
1077                                     s->s_bdev->bd_inode->i_size >> s->
1078                                     s_blocksize_bits;
1079                         } else {
1080                                 *blocks = simple_strtoul(arg, &p, 0);
1081                                 if (*p != '\0') {
1082                                         /* NNN does not look like a number */
1083                                         reiserfs_warning(s, "super-6507",
1084                                                          "bad value %s for "
1085                                                          "-oresize\n", arg);
1086                                         return 0;
1087                                 }
1088                         }
1089                 }
1090
1091                 if (c == 'c') {
1092                         char *p = NULL;
1093                         unsigned long val = simple_strtoul(arg, &p, 0);
1094                         /* commit=NNN (time in seconds) */
1095                         if (*p != '\0' || val >= (unsigned int)-1) {
1096                                 reiserfs_warning(s, "super-6508",
1097                                                  "bad value %s for -ocommit\n",
1098                                                  arg);
1099                                 return 0;
1100                         }
1101                         *commit_max_age = (unsigned int)val;
1102                 }
1103
1104                 if (c == 'w') {
1105                         reiserfs_warning(s, "super-6509", "nolargeio option "
1106                                          "is no longer supported");
1107                         return 0;
1108                 }
1109
1110                 if (c == 'j') {
1111                         if (arg && *arg && jdev_name) {
1112                                 if (*jdev_name) {       //Hm, already assigned?
1113                                         reiserfs_warning(s, "super-6510",
1114                                                          "journal device was "
1115                                                          "already specified to "
1116                                                          "be %s", *jdev_name);
1117                                         return 0;
1118                                 }
1119                                 *jdev_name = arg;
1120                         }
1121                 }
1122 #ifdef CONFIG_QUOTA
1123                 if (c == 'u' || c == 'g') {
1124                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1125
1126                         if (sb_any_quota_loaded(s) &&
1127                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1128                                 reiserfs_warning(s, "super-6511",
1129                                                  "cannot change journaled "
1130                                                  "quota options when quota "
1131                                                  "turned on.");
1132                                 return 0;
1133                         }
1134                         if (*arg) {     /* Some filename specified? */
1135                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1136                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1137                                               arg)) {
1138                                         reiserfs_warning(s, "super-6512",
1139                                                          "%s quota file "
1140                                                          "already specified.",
1141                                                          QTYPE2NAME(qtype));
1142                                         return 0;
1143                                 }
1144                                 if (strchr(arg, '/')) {
1145                                         reiserfs_warning(s, "super-6513",
1146                                                          "quotafile must be "
1147                                                          "on filesystem root.");
1148                                         return 0;
1149                                 }
1150                                 qf_names[qtype] =
1151                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1152                                 if (!qf_names[qtype]) {
1153                                         reiserfs_warning(s, "reiserfs-2502",
1154                                                          "not enough memory "
1155                                                          "for storing "
1156                                                          "quotafile name.");
1157                                         return 0;
1158                                 }
1159                                 strcpy(qf_names[qtype], arg);
1160                                 if (qtype == USRQUOTA)
1161                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1162                                 else
1163                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1164                         } else {
1165                                 if (qf_names[qtype] !=
1166                                     REISERFS_SB(s)->s_qf_names[qtype])
1167                                         kfree(qf_names[qtype]);
1168                                 qf_names[qtype] = NULL;
1169                                 if (qtype == USRQUOTA)
1170                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1171                                 else
1172                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1173                         }
1174                 }
1175                 if (c == 'f') {
1176                         if (!strcmp(arg, "vfsold"))
1177                                 *qfmt = QFMT_VFS_OLD;
1178                         else if (!strcmp(arg, "vfsv0"))
1179                                 *qfmt = QFMT_VFS_V0;
1180                         else {
1181                                 reiserfs_warning(s, "super-6514",
1182                                                  "unknown quota format "
1183                                                  "specified.");
1184                                 return 0;
1185                         }
1186                         if (sb_any_quota_loaded(s) &&
1187                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1188                                 reiserfs_warning(s, "super-6515",
1189                                                  "cannot change journaled "
1190                                                  "quota options when quota "
1191                                                  "turned on.");
1192                                 return 0;
1193                         }
1194                 }
1195 #else
1196                 if (c == 'u' || c == 'g' || c == 'f') {
1197                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1198                                          "quota options not supported.");
1199                         return 0;
1200                 }
1201 #endif
1202         }
1203
1204 #ifdef CONFIG_QUOTA
1205         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1206             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1207                 reiserfs_warning(s, "super-6515",
1208                                  "journaled quota format not specified.");
1209                 return 0;
1210         }
1211         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1212                sb_has_quota_loaded(s, USRQUOTA)) ||
1213             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1214                sb_has_quota_loaded(s, GRPQUOTA))) {
1215                 reiserfs_warning(s, "super-6516", "quota options must "
1216                                  "be present when quota is turned on.");
1217                 return 0;
1218         }
1219 #endif
1220
1221         return 1;
1222 }
1223
1224 static void switch_data_mode(struct super_block *s, unsigned long mode)
1225 {
1226         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1227                                          (1 << REISERFS_DATA_ORDERED) |
1228                                          (1 << REISERFS_DATA_WRITEBACK));
1229         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1230 }
1231
1232 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1233 {
1234         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1235                 if (!reiserfs_data_log(s)) {
1236                         switch_data_mode(s, REISERFS_DATA_LOG);
1237                         reiserfs_info(s, "switching to journaled data mode\n");
1238                 }
1239         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1240                 if (!reiserfs_data_ordered(s)) {
1241                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1242                         reiserfs_info(s, "switching to ordered data mode\n");
1243                 }
1244         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1245                 if (!reiserfs_data_writeback(s)) {
1246                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1247                         reiserfs_info(s, "switching to writeback data mode\n");
1248                 }
1249         }
1250 }
1251
1252 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1253 {
1254         int flush = (1 << REISERFS_BARRIER_FLUSH);
1255         int none = (1 << REISERFS_BARRIER_NONE);
1256         int all_barrier = flush | none;
1257
1258         if (bits & all_barrier) {
1259                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1260                 if (bits & flush) {
1261                         REISERFS_SB(s)->s_mount_opt |= flush;
1262                         printk("reiserfs: enabling write barrier flush mode\n");
1263                 } else if (bits & none) {
1264                         REISERFS_SB(s)->s_mount_opt |= none;
1265                         printk("reiserfs: write barriers turned off\n");
1266                 }
1267         }
1268 }
1269
1270 static void handle_attrs(struct super_block *s)
1271 {
1272         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1273
1274         if (reiserfs_attrs(s)) {
1275                 if (old_format_only(s)) {
1276                         reiserfs_warning(s, "super-6517", "cannot support "
1277                                          "attributes on 3.5.x disk format");
1278                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1279                         return;
1280                 }
1281                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1282                         reiserfs_warning(s, "super-6518", "cannot support "
1283                                          "attributes until flag is set in "
1284                                          "super-block");
1285                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1286                 }
1287         }
1288 }
1289
1290 #ifdef CONFIG_QUOTA
1291 static void handle_quota_files(struct super_block *s, char **qf_names,
1292                                unsigned int *qfmt)
1293 {
1294         int i;
1295
1296         for (i = 0; i < MAXQUOTAS; i++) {
1297                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1298                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1299                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1300         }
1301         if (*qfmt)
1302                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1303 }
1304 #endif
1305
1306 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1307 {
1308         struct reiserfs_super_block *rs;
1309         struct reiserfs_transaction_handle th;
1310         unsigned long blocks;
1311         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1312         unsigned long safe_mask = 0;
1313         unsigned int commit_max_age = (unsigned int)-1;
1314         struct reiserfs_journal *journal = SB_JOURNAL(s);
1315         char *new_opts = kstrdup(arg, GFP_KERNEL);
1316         int err;
1317         char *qf_names[MAXQUOTAS];
1318         unsigned int qfmt = 0;
1319 #ifdef CONFIG_QUOTA
1320         int i;
1321 #endif
1322
1323         reiserfs_write_lock(s);
1324
1325 #ifdef CONFIG_QUOTA
1326         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1327 #endif
1328
1329         rs = SB_DISK_SUPER_BLOCK(s);
1330
1331         if (!reiserfs_parse_options
1332             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1333             qf_names, &qfmt)) {
1334 #ifdef CONFIG_QUOTA
1335                 for (i = 0; i < MAXQUOTAS; i++)
1336                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1337                                 kfree(qf_names[i]);
1338 #endif
1339                 err = -EINVAL;
1340                 goto out_unlock;
1341         }
1342 #ifdef CONFIG_QUOTA
1343         handle_quota_files(s, qf_names, &qfmt);
1344 #endif
1345
1346         handle_attrs(s);
1347
1348         /* Add options that are safe here */
1349         safe_mask |= 1 << REISERFS_SMALLTAIL;
1350         safe_mask |= 1 << REISERFS_LARGETAIL;
1351         safe_mask |= 1 << REISERFS_NO_BORDER;
1352         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1353         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1354         safe_mask |= 1 << REISERFS_TEST4;
1355         safe_mask |= 1 << REISERFS_ATTRS;
1356         safe_mask |= 1 << REISERFS_XATTRS_USER;
1357         safe_mask |= 1 << REISERFS_POSIXACL;
1358         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1359         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1360         safe_mask |= 1 << REISERFS_ERROR_RO;
1361         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1362         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1363         safe_mask |= 1 << REISERFS_USRQUOTA;
1364         safe_mask |= 1 << REISERFS_GRPQUOTA;
1365
1366         /* Update the bitmask, taking care to keep
1367          * the bits we're not allowed to change here */
1368         REISERFS_SB(s)->s_mount_opt =
1369             (REISERFS_SB(s)->
1370              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1371
1372         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1373                 journal->j_max_commit_age = commit_max_age;
1374                 journal->j_max_trans_age = commit_max_age;
1375         } else if (commit_max_age == 0) {
1376                 /* 0 means restore defaults. */
1377                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1378                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1379         }
1380
1381         if (blocks) {
1382                 err = reiserfs_resize(s, blocks);
1383                 if (err != 0)
1384                         goto out_unlock;
1385         }
1386
1387         if (*mount_flags & MS_RDONLY) {
1388                 reiserfs_xattr_init(s, *mount_flags);
1389                 /* remount read-only */
1390                 if (s->s_flags & MS_RDONLY)
1391                         /* it is read-only already */
1392                         goto out_ok;
1393
1394                 /*
1395                  * Drop write lock. Quota will retake it when needed and lock
1396                  * ordering requires calling dquot_suspend() without it.
1397                  */
1398                 reiserfs_write_unlock(s);
1399                 err = dquot_suspend(s, -1);
1400                 if (err < 0)
1401                         goto out_err;
1402                 reiserfs_write_lock(s);
1403
1404                 /* try to remount file system with read-only permissions */
1405                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1406                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1407                         goto out_ok;
1408                 }
1409
1410                 err = journal_begin(&th, s, 10);
1411                 if (err)
1412                         goto out_unlock;
1413
1414                 /* Mounting a rw partition read-only. */
1415                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1416                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1417                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1418         } else {
1419                 /* remount read-write */
1420                 if (!(s->s_flags & MS_RDONLY)) {
1421                         reiserfs_xattr_init(s, *mount_flags);
1422                         goto out_ok;    /* We are read-write already */
1423                 }
1424
1425                 if (reiserfs_is_journal_aborted(journal)) {
1426                         err = journal->j_errno;
1427                         goto out_unlock;
1428                 }
1429
1430                 handle_data_mode(s, mount_options);
1431                 handle_barrier_mode(s, mount_options);
1432                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1433                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1434                 err = journal_begin(&th, s, 10);
1435                 if (err)
1436                         goto out_unlock;
1437
1438                 /* Mount a partition which is read-only, read-write */
1439                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1440                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1441                 s->s_flags &= ~MS_RDONLY;
1442                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1443                 if (!old_format_only(s))
1444                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1445                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1446                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1447                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1448         }
1449         /* this will force a full flush of all journal lists */
1450         SB_JOURNAL(s)->j_must_wait = 1;
1451         err = journal_end(&th, s, 10);
1452         if (err)
1453                 goto out_unlock;
1454
1455         if (!(*mount_flags & MS_RDONLY)) {
1456                 /*
1457                  * Drop write lock. Quota will retake it when needed and lock
1458                  * ordering requires calling dquot_resume() without it.
1459                  */
1460                 reiserfs_write_unlock(s);
1461                 dquot_resume(s, -1);
1462                 reiserfs_write_lock(s);
1463                 finish_unfinished(s);
1464                 reiserfs_xattr_init(s, *mount_flags);
1465         }
1466
1467 out_ok:
1468         replace_mount_options(s, new_opts);
1469         reiserfs_write_unlock(s);
1470         return 0;
1471
1472 out_unlock:
1473         reiserfs_write_unlock(s);
1474 out_err:
1475         kfree(new_opts);
1476         return err;
1477 }
1478
1479 static int read_super_block(struct super_block *s, int offset)
1480 {
1481         struct buffer_head *bh;
1482         struct reiserfs_super_block *rs;
1483         int fs_blocksize;
1484
1485         bh = sb_bread(s, offset / s->s_blocksize);
1486         if (!bh) {
1487                 reiserfs_warning(s, "sh-2006",
1488                                  "bread failed (dev %s, block %lu, size %lu)",
1489                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1490                                  s->s_blocksize);
1491                 return 1;
1492         }
1493
1494         rs = (struct reiserfs_super_block *)bh->b_data;
1495         if (!is_any_reiserfs_magic_string(rs)) {
1496                 brelse(bh);
1497                 return 1;
1498         }
1499         //
1500         // ok, reiserfs signature (old or new) found in at the given offset
1501         //
1502         fs_blocksize = sb_blocksize(rs);
1503         brelse(bh);
1504         sb_set_blocksize(s, fs_blocksize);
1505
1506         bh = sb_bread(s, offset / s->s_blocksize);
1507         if (!bh) {
1508                 reiserfs_warning(s, "sh-2007",
1509                                  "bread failed (dev %s, block %lu, size %lu)",
1510                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1511                                  s->s_blocksize);
1512                 return 1;
1513         }
1514
1515         rs = (struct reiserfs_super_block *)bh->b_data;
1516         if (sb_blocksize(rs) != s->s_blocksize) {
1517                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1518                                  "filesystem on (dev %s, block %Lu, size %lu)",
1519                                  reiserfs_bdevname(s),
1520                                  (unsigned long long)bh->b_blocknr,
1521                                  s->s_blocksize);
1522                 brelse(bh);
1523                 return 1;
1524         }
1525
1526         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1527                 brelse(bh);
1528                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1529                                  "--rebuild-tree run detected. Please run\n"
1530                                  "reiserfsck --rebuild-tree and wait for a "
1531                                  "completion. If that fails\n"
1532                                  "get newer reiserfsprogs package");
1533                 return 1;
1534         }
1535
1536         SB_BUFFER_WITH_SB(s) = bh;
1537         SB_DISK_SUPER_BLOCK(s) = rs;
1538
1539         if (is_reiserfs_jr(rs)) {
1540                 /* magic is of non-standard journal filesystem, look at s_version to
1541                    find which format is in use */
1542                 if (sb_version(rs) == REISERFS_VERSION_2)
1543                         reiserfs_info(s, "found reiserfs format \"3.6\""
1544                                       " with non-standard journal\n");
1545                 else if (sb_version(rs) == REISERFS_VERSION_1)
1546                         reiserfs_info(s, "found reiserfs format \"3.5\""
1547                                       " with non-standard journal\n");
1548                 else {
1549                         reiserfs_warning(s, "sh-2012", "found unknown "
1550                                          "format \"%u\" of reiserfs with "
1551                                          "non-standard magic", sb_version(rs));
1552                         return 1;
1553                 }
1554         } else
1555                 /* s_version of standard format may contain incorrect information,
1556                    so we just look at the magic string */
1557                 reiserfs_info(s,
1558                               "found reiserfs format \"%s\" with standard journal\n",
1559                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1560
1561         s->s_op = &reiserfs_sops;
1562         s->s_export_op = &reiserfs_export_ops;
1563 #ifdef CONFIG_QUOTA
1564         s->s_qcop = &reiserfs_qctl_operations;
1565         s->dq_op = &reiserfs_quota_operations;
1566 #endif
1567
1568         /* new format is limited by the 32 bit wide i_blocks field, want to
1569          ** be one full block below that.
1570          */
1571         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1572         return 0;
1573 }
1574
1575 /* after journal replay, reread all bitmap and super blocks */
1576 static int reread_meta_blocks(struct super_block *s)
1577 {
1578         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1579         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1580         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1581                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1582                 return 1;
1583         }
1584
1585         return 0;
1586 }
1587
1588 /////////////////////////////////////////////////////
1589 // hash detection stuff
1590
1591 // if root directory is empty - we set default - Yura's - hash and
1592 // warn about it
1593 // FIXME: we look for only one name in a directory. If tea and yura
1594 // bith have the same value - we ask user to send report to the
1595 // mailing list
1596 static __u32 find_hash_out(struct super_block *s)
1597 {
1598         int retval;
1599         struct inode *inode;
1600         struct cpu_key key;
1601         INITIALIZE_PATH(path);
1602         struct reiserfs_dir_entry de;
1603         __u32 hash = DEFAULT_HASH;
1604
1605         inode = s->s_root->d_inode;
1606
1607         do {                    // Some serious "goto"-hater was there ;)
1608                 u32 teahash, r5hash, yurahash;
1609
1610                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1611                 retval = search_by_entry_key(s, &key, &path, &de);
1612                 if (retval == IO_ERROR) {
1613                         pathrelse(&path);
1614                         return UNSET_HASH;
1615                 }
1616                 if (retval == NAME_NOT_FOUND)
1617                         de.de_entry_num--;
1618                 set_de_name_and_namelen(&de);
1619                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1620                         /* allow override in this case */
1621                         if (reiserfs_rupasov_hash(s)) {
1622                                 hash = YURA_HASH;
1623                         }
1624                         reiserfs_info(s, "FS seems to be empty, autodetect "
1625                                          "is using the default hash\n");
1626                         break;
1627                 }
1628                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1629                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1630                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1631                 if (((teahash == r5hash)
1632                      &&
1633                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1634                       == r5hash)) || ((teahash == yurahash)
1635                                       && (yurahash ==
1636                                           GET_HASH_VALUE(deh_offset
1637                                                          (&
1638                                                           (de.
1639                                                            de_deh[de.
1640                                                                   de_entry_num])))))
1641                     || ((r5hash == yurahash)
1642                         && (yurahash ==
1643                             GET_HASH_VALUE(deh_offset
1644                                            (&(de.de_deh[de.de_entry_num])))))) {
1645                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1646                                          "automatically detect hash function. "
1647                                          "Please mount with -o "
1648                                          "hash={tea,rupasov,r5}");
1649                         hash = UNSET_HASH;
1650                         break;
1651                 }
1652                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1653                     yurahash)
1654                         hash = YURA_HASH;
1655                 else if (GET_HASH_VALUE
1656                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1657                         hash = TEA_HASH;
1658                 else if (GET_HASH_VALUE
1659                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1660                         hash = R5_HASH;
1661                 else {
1662                         reiserfs_warning(s, "reiserfs-2506",
1663                                          "Unrecognised hash function");
1664                         hash = UNSET_HASH;
1665                 }
1666         } while (0);
1667
1668         pathrelse(&path);
1669         return hash;
1670 }
1671
1672 // finds out which hash names are sorted with
1673 static int what_hash(struct super_block *s)
1674 {
1675         __u32 code;
1676
1677         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1678
1679         /* reiserfs_hash_detect() == true if any of the hash mount options
1680          ** were used.  We must check them to make sure the user isn't
1681          ** using a bad hash value
1682          */
1683         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1684                 code = find_hash_out(s);
1685
1686         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1687                 /* detection has found the hash, and we must check against the
1688                  ** mount options
1689                  */
1690                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1691                         reiserfs_warning(s, "reiserfs-2507",
1692                                          "Error, %s hash detected, "
1693                                          "unable to force rupasov hash",
1694                                          reiserfs_hashname(code));
1695                         code = UNSET_HASH;
1696                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1697                         reiserfs_warning(s, "reiserfs-2508",
1698                                          "Error, %s hash detected, "
1699                                          "unable to force tea hash",
1700                                          reiserfs_hashname(code));
1701                         code = UNSET_HASH;
1702                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1703                         reiserfs_warning(s, "reiserfs-2509",
1704                                          "Error, %s hash detected, "
1705                                          "unable to force r5 hash",
1706                                          reiserfs_hashname(code));
1707                         code = UNSET_HASH;
1708                 }
1709         } else {
1710                 /* find_hash_out was not called or could not determine the hash */
1711                 if (reiserfs_rupasov_hash(s)) {
1712                         code = YURA_HASH;
1713                 } else if (reiserfs_tea_hash(s)) {
1714                         code = TEA_HASH;
1715                 } else if (reiserfs_r5_hash(s)) {
1716                         code = R5_HASH;
1717                 }
1718         }
1719
1720         /* if we are mounted RW, and we have a new valid hash code, update
1721          ** the super
1722          */
1723         if (code != UNSET_HASH &&
1724             !(s->s_flags & MS_RDONLY) &&
1725             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1726                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1727         }
1728         return code;
1729 }
1730
1731 // return pointer to appropriate function
1732 static hashf_t hash_function(struct super_block *s)
1733 {
1734         switch (what_hash(s)) {
1735         case TEA_HASH:
1736                 reiserfs_info(s, "Using tea hash to sort names\n");
1737                 return keyed_hash;
1738         case YURA_HASH:
1739                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1740                 return yura_hash;
1741         case R5_HASH:
1742                 reiserfs_info(s, "Using r5 hash to sort names\n");
1743                 return r5_hash;
1744         }
1745         return NULL;
1746 }
1747
1748 // this is used to set up correct value for old partitions
1749 static int function2code(hashf_t func)
1750 {
1751         if (func == keyed_hash)
1752                 return TEA_HASH;
1753         if (func == yura_hash)
1754                 return YURA_HASH;
1755         if (func == r5_hash)
1756                 return R5_HASH;
1757
1758         BUG();                  // should never happen
1759
1760         return 0;
1761 }
1762
1763 #define SWARN(silent, s, id, ...)                       \
1764         if (!(silent))                          \
1765                 reiserfs_warning(s, id, __VA_ARGS__)
1766
1767 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1768 {
1769         struct inode *root_inode;
1770         struct reiserfs_transaction_handle th;
1771         int old_format = 0;
1772         unsigned long blocks;
1773         unsigned int commit_max_age = 0;
1774         int jinit_done = 0;
1775         struct reiserfs_iget_args args;
1776         struct reiserfs_super_block *rs;
1777         char *jdev_name;
1778         struct reiserfs_sb_info *sbi;
1779         int errval = -EINVAL;
1780         char *qf_names[MAXQUOTAS] = {};
1781         unsigned int qfmt = 0;
1782
1783         save_mount_options(s, data);
1784
1785         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1786         if (!sbi)
1787                 return -ENOMEM;
1788         s->s_fs_info = sbi;
1789         /* Set default values for options: non-aggressive tails, RO on errors */
1790         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1791         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1792         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1793         /* no preallocation minimum, be smart in
1794            reiserfs_file_write instead */
1795         sbi->s_alloc_options.preallocmin = 0;
1796         /* Preallocate by 16 blocks (17-1) at once */
1797         sbi->s_alloc_options.preallocsize = 17;
1798         /* setup default block allocator options */
1799         reiserfs_init_alloc_options(s);
1800
1801         spin_lock_init(&sbi->old_work_lock);
1802         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1803         mutex_init(&sbi->lock);
1804         sbi->lock_depth = -1;
1805
1806         jdev_name = NULL;
1807         if (reiserfs_parse_options
1808             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1809              &commit_max_age, qf_names, &qfmt) == 0) {
1810                 goto error_unlocked;
1811         }
1812         if (jdev_name && jdev_name[0]) {
1813                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1814                 if (!sbi->s_jdev) {
1815                         SWARN(silent, s, "", "Cannot allocate memory for "
1816                                 "journal device name");
1817                         goto error;
1818                 }
1819         }
1820 #ifdef CONFIG_QUOTA
1821         handle_quota_files(s, qf_names, &qfmt);
1822 #endif
1823
1824         if (blocks) {
1825                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1826                 goto error_unlocked;
1827         }
1828
1829         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1830         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1831                 old_format = 1;
1832         /* try new format (64-th 1k block), which can contain reiserfs super block */
1833         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1834                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1835                       reiserfs_bdevname(s));
1836                 goto error_unlocked;
1837         }
1838
1839         rs = SB_DISK_SUPER_BLOCK(s);
1840         /* Let's do basic sanity check to verify that underlying device is not
1841            smaller than the filesystem. If the check fails then abort and scream,
1842            because bad stuff will happen otherwise. */
1843         if (s->s_bdev && s->s_bdev->bd_inode
1844             && i_size_read(s->s_bdev->bd_inode) <
1845             sb_block_count(rs) * sb_blocksize(rs)) {
1846                 SWARN(silent, s, "", "Filesystem cannot be "
1847                       "mounted because it is bigger than the device");
1848                 SWARN(silent, s, "", "You may need to run fsck "
1849                       "or increase size of your LVM partition");
1850                 SWARN(silent, s, "", "Or may be you forgot to "
1851                       "reboot after fdisk when it told you to");
1852                 goto error_unlocked;
1853         }
1854
1855         sbi->s_mount_state = SB_REISERFS_STATE(s);
1856         sbi->s_mount_state = REISERFS_VALID_FS;
1857
1858         if ((errval = reiserfs_init_bitmap_cache(s))) {
1859                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1860                 goto error_unlocked;
1861         }
1862
1863         errval = -EINVAL;
1864 #ifdef CONFIG_REISERFS_CHECK
1865         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1866         SWARN(silent, s, "", "- it is slow mode for debugging.");
1867 #endif
1868
1869         /* make data=ordered the default */
1870         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1871             !reiserfs_data_writeback(s)) {
1872                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1873         }
1874
1875         if (reiserfs_data_log(s)) {
1876                 reiserfs_info(s, "using journaled data mode\n");
1877         } else if (reiserfs_data_ordered(s)) {
1878                 reiserfs_info(s, "using ordered data mode\n");
1879         } else {
1880                 reiserfs_info(s, "using writeback data mode\n");
1881         }
1882         if (reiserfs_barrier_flush(s)) {
1883                 printk("reiserfs: using flush barriers\n");
1884         }
1885
1886         // set_device_ro(s->s_dev, 1) ;
1887         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1888                 SWARN(silent, s, "sh-2022",
1889                       "unable to initialize journal space");
1890                 goto error_unlocked;
1891         } else {
1892                 jinit_done = 1; /* once this is set, journal_release must be called
1893                                  ** if we error out of the mount
1894                                  */
1895         }
1896
1897         if (reread_meta_blocks(s)) {
1898                 SWARN(silent, s, "jmacd-9",
1899                       "unable to reread meta blocks after journal init");
1900                 goto error_unlocked;
1901         }
1902
1903         if (replay_only(s))
1904                 goto error_unlocked;
1905
1906         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1907                 SWARN(silent, s, "clm-7000",
1908                       "Detected readonly device, marking FS readonly");
1909                 s->s_flags |= MS_RDONLY;
1910         }
1911         args.objectid = REISERFS_ROOT_OBJECTID;
1912         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1913         root_inode =
1914             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1915                          reiserfs_init_locked_inode, (void *)(&args));
1916         if (!root_inode) {
1917                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1918                 goto error_unlocked;
1919         }
1920
1921         /*
1922          * This path assumed to be called with the BKL in the old times.
1923          * Now we have inherited the big reiserfs lock from it and many
1924          * reiserfs helpers called in the mount path and elsewhere require
1925          * this lock to be held even if it's not always necessary. Let's be
1926          * conservative and hold it early. The window can be reduced after
1927          * careful review of the code.
1928          */
1929         reiserfs_write_lock(s);
1930
1931         if (root_inode->i_state & I_NEW) {
1932                 reiserfs_read_locked_inode(root_inode, &args);
1933                 unlock_new_inode(root_inode);
1934         }
1935
1936         s->s_root = d_make_root(root_inode);
1937         if (!s->s_root)
1938                 goto error;
1939         // define and initialize hash function
1940         sbi->s_hash_function = hash_function(s);
1941         if (sbi->s_hash_function == NULL) {
1942                 dput(s->s_root);
1943                 s->s_root = NULL;
1944                 goto error;
1945         }
1946
1947         if (is_reiserfs_3_5(rs)
1948             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1949                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1950         else if (old_format)
1951                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1952         else
1953                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1954
1955         if (!(s->s_flags & MS_RDONLY)) {
1956
1957                 errval = journal_begin(&th, s, 1);
1958                 if (errval) {
1959                         dput(s->s_root);
1960                         s->s_root = NULL;
1961                         goto error;
1962                 }
1963                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1964
1965                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1966                 set_sb_fs_state(rs, 0);
1967
1968                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1969                  * case, but older revisions can't. This will cause the
1970                  * file system to fail mount on those older implementations,
1971                  * avoiding corruption. -jeffm */
1972                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1973                     sb_bmap_nr(rs) != 0) {
1974                         reiserfs_warning(s, "super-2030", "This file system "
1975                                         "claims to use %u bitmap blocks in "
1976                                         "its super block, but requires %u. "
1977                                         "Clearing to zero.", sb_bmap_nr(rs),
1978                                         reiserfs_bmap_count(s));
1979
1980                         set_sb_bmap_nr(rs, 0);
1981                 }
1982
1983                 if (old_format_only(s)) {
1984                         /* filesystem of format 3.5 either with standard or non-standard
1985                            journal */
1986                         if (convert_reiserfs(s)) {
1987                                 /* and -o conv is given */
1988                                 if (!silent)
1989                                         reiserfs_info(s,
1990                                                       "converting 3.5 filesystem to the 3.6 format");
1991
1992                                 if (is_reiserfs_3_5(rs))
1993                                         /* put magic string of 3.6 format. 2.2 will not be able to
1994                                            mount this filesystem anymore */
1995                                         memcpy(rs->s_v1.s_magic,
1996                                                reiserfs_3_6_magic_string,
1997                                                sizeof
1998                                                (reiserfs_3_6_magic_string));
1999
2000                                 set_sb_version(rs, REISERFS_VERSION_2);
2001                                 reiserfs_convert_objectid_map_v1(s);
2002                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
2003                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
2004                         } else if (!silent) {
2005                                 reiserfs_info(s, "using 3.5.x disk format\n");
2006                         }
2007                 } else
2008                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2009
2010
2011                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2012                 errval = journal_end(&th, s, 1);
2013                 if (errval) {
2014                         dput(s->s_root);
2015                         s->s_root = NULL;
2016                         goto error;
2017                 }
2018
2019                 if ((errval = reiserfs_lookup_privroot(s)) ||
2020                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2021                         dput(s->s_root);
2022                         s->s_root = NULL;
2023                         goto error;
2024                 }
2025
2026                 /* look for files which were to be removed in previous session */
2027                 finish_unfinished(s);
2028         } else {
2029                 if (old_format_only(s) && !silent) {
2030                         reiserfs_info(s, "using 3.5.x disk format\n");
2031                 }
2032
2033                 if ((errval = reiserfs_lookup_privroot(s)) ||
2034                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2035                         dput(s->s_root);
2036                         s->s_root = NULL;
2037                         goto error;
2038                 }
2039         }
2040         // mark hash in super block: it could be unset. overwrite should be ok
2041         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2042
2043         handle_attrs(s);
2044
2045         reiserfs_proc_info_init(s);
2046
2047         init_waitqueue_head(&(sbi->s_wait));
2048         spin_lock_init(&sbi->bitmap_lock);
2049
2050         reiserfs_write_unlock(s);
2051
2052         return (0);
2053
2054 error:
2055         reiserfs_write_unlock(s);
2056
2057 error_unlocked:
2058         /* kill the commit thread, free journal ram */
2059         if (jinit_done) {
2060                 reiserfs_write_lock(s);
2061                 journal_release_error(NULL, s);
2062                 reiserfs_write_unlock(s);
2063         }
2064
2065         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2066
2067         reiserfs_free_bitmap_cache(s);
2068         if (SB_BUFFER_WITH_SB(s))
2069                 brelse(SB_BUFFER_WITH_SB(s));
2070 #ifdef CONFIG_QUOTA
2071         {
2072                 int j;
2073                 for (j = 0; j < MAXQUOTAS; j++)
2074                         kfree(qf_names[j]);
2075         }
2076 #endif
2077         kfree(sbi);
2078
2079         s->s_fs_info = NULL;
2080         return errval;
2081 }
2082
2083 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2084 {
2085         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2086
2087         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2088         buf->f_bfree = sb_free_blocks(rs);
2089         buf->f_bavail = buf->f_bfree;
2090         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2091         buf->f_bsize = dentry->d_sb->s_blocksize;
2092         /* changed to accommodate gcc folks. */
2093         buf->f_type = REISERFS_SUPER_MAGIC;
2094         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2095         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2096                                 sizeof(rs->s_uuid)/2);
2097
2098         return 0;
2099 }
2100
2101 #ifdef CONFIG_QUOTA
2102 static int reiserfs_write_dquot(struct dquot *dquot)
2103 {
2104         struct reiserfs_transaction_handle th;
2105         int ret, err;
2106
2107         reiserfs_write_lock(dquot->dq_sb);
2108         ret =
2109             journal_begin(&th, dquot->dq_sb,
2110                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2111         if (ret)
2112                 goto out;
2113         reiserfs_write_unlock(dquot->dq_sb);
2114         ret = dquot_commit(dquot);
2115         reiserfs_write_lock(dquot->dq_sb);
2116         err =
2117             journal_end(&th, dquot->dq_sb,
2118                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2119         if (!ret && err)
2120                 ret = err;
2121 out:
2122         reiserfs_write_unlock(dquot->dq_sb);
2123         return ret;
2124 }
2125
2126 static int reiserfs_acquire_dquot(struct dquot *dquot)
2127 {
2128         struct reiserfs_transaction_handle th;
2129         int ret, err;
2130
2131         reiserfs_write_lock(dquot->dq_sb);
2132         ret =
2133             journal_begin(&th, dquot->dq_sb,
2134                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2135         if (ret)
2136                 goto out;
2137         reiserfs_write_unlock(dquot->dq_sb);
2138         ret = dquot_acquire(dquot);
2139         reiserfs_write_lock(dquot->dq_sb);
2140         err =
2141             journal_end(&th, dquot->dq_sb,
2142                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2143         if (!ret && err)
2144                 ret = err;
2145 out:
2146         reiserfs_write_unlock(dquot->dq_sb);
2147         return ret;
2148 }
2149
2150 static int reiserfs_release_dquot(struct dquot *dquot)
2151 {
2152         struct reiserfs_transaction_handle th;
2153         int ret, err;
2154
2155         reiserfs_write_lock(dquot->dq_sb);
2156         ret =
2157             journal_begin(&th, dquot->dq_sb,
2158                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2159         reiserfs_write_unlock(dquot->dq_sb);
2160         if (ret) {
2161                 /* Release dquot anyway to avoid endless cycle in dqput() */
2162                 dquot_release(dquot);
2163                 goto out;
2164         }
2165         ret = dquot_release(dquot);
2166         reiserfs_write_lock(dquot->dq_sb);
2167         err =
2168             journal_end(&th, dquot->dq_sb,
2169                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2170         if (!ret && err)
2171                 ret = err;
2172         reiserfs_write_unlock(dquot->dq_sb);
2173 out:
2174         return ret;
2175 }
2176
2177 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2178 {
2179         /* Are we journaling quotas? */
2180         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2181             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2182                 dquot_mark_dquot_dirty(dquot);
2183                 return reiserfs_write_dquot(dquot);
2184         } else
2185                 return dquot_mark_dquot_dirty(dquot);
2186 }
2187
2188 static int reiserfs_write_info(struct super_block *sb, int type)
2189 {
2190         struct reiserfs_transaction_handle th;
2191         int ret, err;
2192
2193         /* Data block + inode block */
2194         reiserfs_write_lock(sb);
2195         ret = journal_begin(&th, sb, 2);
2196         if (ret)
2197                 goto out;
2198         reiserfs_write_unlock(sb);
2199         ret = dquot_commit_info(sb, type);
2200         reiserfs_write_lock(sb);
2201         err = journal_end(&th, sb, 2);
2202         if (!ret && err)
2203                 ret = err;
2204 out:
2205         reiserfs_write_unlock(sb);
2206         return ret;
2207 }
2208
2209 /*
2210  * Turn on quotas during mount time - we need to find the quota file and such...
2211  */
2212 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2213 {
2214         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2215                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2216 }
2217
2218 /*
2219  * Standard function to be called on quota_on
2220  */
2221 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2222                              struct path *path)
2223 {
2224         int err;
2225         struct inode *inode;
2226         struct reiserfs_transaction_handle th;
2227         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2228
2229         reiserfs_write_lock(sb);
2230         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2231                 err = -EINVAL;
2232                 goto out;
2233         }
2234
2235         /* Quotafile not on the same filesystem? */
2236         if (path->dentry->d_sb != sb) {
2237                 err = -EXDEV;
2238                 goto out;
2239         }
2240         inode = path->dentry->d_inode;
2241         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2242         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2243                 err = reiserfs_unpack(inode, NULL);
2244                 if (err) {
2245                         reiserfs_warning(sb, "super-6520",
2246                                 "Unpacking tail of quota file failed"
2247                                 " (%d). Cannot turn on quotas.", err);
2248                         err = -EINVAL;
2249                         goto out;
2250                 }
2251                 mark_inode_dirty(inode);
2252         }
2253         /* Journaling quota? */
2254         if (REISERFS_SB(sb)->s_qf_names[type]) {
2255                 /* Quotafile not of fs root? */
2256                 if (path->dentry->d_parent != sb->s_root)
2257                         reiserfs_warning(sb, "super-6521",
2258                                  "Quota file not on filesystem root. "
2259                                  "Journalled quota will not work.");
2260         }
2261
2262         /*
2263          * When we journal data on quota file, we have to flush journal to see
2264          * all updates to the file when we bypass pagecache...
2265          */
2266         if (reiserfs_file_data_log(inode)) {
2267                 /* Just start temporary transaction and finish it */
2268                 err = journal_begin(&th, sb, 1);
2269                 if (err)
2270                         goto out;
2271                 err = journal_end_sync(&th, sb, 1);
2272                 if (err)
2273                         goto out;
2274         }
2275         reiserfs_write_unlock(sb);
2276         return dquot_quota_on(sb, type, format_id, path);
2277 out:
2278         reiserfs_write_unlock(sb);
2279         return err;
2280 }
2281
2282 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2283  * acquiring the locks... As quota files are never truncated and quota code
2284  * itself serializes the operations (and no one else should touch the files)
2285  * we don't have to be afraid of races */
2286 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2287                                    size_t len, loff_t off)
2288 {
2289         struct inode *inode = sb_dqopt(sb)->files[type];
2290         unsigned long blk = off >> sb->s_blocksize_bits;
2291         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2292         size_t toread;
2293         struct buffer_head tmp_bh, *bh;
2294         loff_t i_size = i_size_read(inode);
2295
2296         if (off > i_size)
2297                 return 0;
2298         if (off + len > i_size)
2299                 len = i_size - off;
2300         toread = len;
2301         while (toread > 0) {
2302                 tocopy =
2303                     sb->s_blocksize - offset <
2304                     toread ? sb->s_blocksize - offset : toread;
2305                 tmp_bh.b_state = 0;
2306                 /* Quota files are without tails so we can safely use this function */
2307                 reiserfs_write_lock(sb);
2308                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2309                 reiserfs_write_unlock(sb);
2310                 if (err)
2311                         return err;
2312                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2313                         memset(data, 0, tocopy);
2314                 else {
2315                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2316                         if (!bh)
2317                                 return -EIO;
2318                         memcpy(data, bh->b_data + offset, tocopy);
2319                         brelse(bh);
2320                 }
2321                 offset = 0;
2322                 toread -= tocopy;
2323                 data += tocopy;
2324                 blk++;
2325         }
2326         return len;
2327 }
2328
2329 /* Write to quotafile (we know the transaction is already started and has
2330  * enough credits) */
2331 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2332                                     const char *data, size_t len, loff_t off)
2333 {
2334         struct inode *inode = sb_dqopt(sb)->files[type];
2335         unsigned long blk = off >> sb->s_blocksize_bits;
2336         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2337         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2338         size_t towrite = len;
2339         struct buffer_head tmp_bh, *bh;
2340
2341         if (!current->journal_info) {
2342                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2343                         " cancelled because transaction is not started.\n",
2344                         (unsigned long long)off, (unsigned long long)len);
2345                 return -EIO;
2346         }
2347         while (towrite > 0) {
2348                 tocopy = sb->s_blocksize - offset < towrite ?
2349                     sb->s_blocksize - offset : towrite;
2350                 tmp_bh.b_state = 0;
2351                 reiserfs_write_lock(sb);
2352                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2353                 reiserfs_write_unlock(sb);
2354                 if (err)
2355                         goto out;
2356                 if (offset || tocopy != sb->s_blocksize)
2357                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2358                 else
2359                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2360                 if (!bh) {
2361                         err = -EIO;
2362                         goto out;
2363                 }
2364                 lock_buffer(bh);
2365                 memcpy(bh->b_data + offset, data, tocopy);
2366                 flush_dcache_page(bh->b_page);
2367                 set_buffer_uptodate(bh);
2368                 unlock_buffer(bh);
2369                 reiserfs_write_lock(sb);
2370                 reiserfs_prepare_for_journal(sb, bh, 1);
2371                 journal_mark_dirty(current->journal_info, sb, bh);
2372                 if (!journal_quota)
2373                         reiserfs_add_ordered_list(inode, bh);
2374                 reiserfs_write_unlock(sb);
2375                 brelse(bh);
2376                 offset = 0;
2377                 towrite -= tocopy;
2378                 data += tocopy;
2379                 blk++;
2380         }
2381 out:
2382         if (len == towrite)
2383                 return err;
2384         if (inode->i_size < off + len - towrite)
2385                 i_size_write(inode, off + len - towrite);
2386         inode->i_version++;
2387         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2388         mark_inode_dirty(inode);
2389         return len - towrite;
2390 }
2391
2392 #endif
2393
2394 static struct dentry *get_super_block(struct file_system_type *fs_type,
2395                            int flags, const char *dev_name,
2396                            void *data)
2397 {
2398         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2399 }
2400
2401 static int __init init_reiserfs_fs(void)
2402 {
2403         int ret;
2404
2405         if ((ret = init_inodecache())) {
2406                 return ret;
2407         }
2408
2409         reiserfs_proc_info_global_init();
2410
2411         ret = register_filesystem(&reiserfs_fs_type);
2412
2413         if (ret == 0) {
2414                 return 0;
2415         }
2416
2417         reiserfs_proc_info_global_done();
2418         destroy_inodecache();
2419
2420         return ret;
2421 }
2422
2423 static void __exit exit_reiserfs_fs(void)
2424 {
2425         reiserfs_proc_info_global_done();
2426         unregister_filesystem(&reiserfs_fs_type);
2427         destroy_inodecache();
2428 }
2429
2430 struct file_system_type reiserfs_fs_type = {
2431         .owner = THIS_MODULE,
2432         .name = "reiserfs",
2433         .mount = get_super_block,
2434         .kill_sb = reiserfs_kill_sb,
2435         .fs_flags = FS_REQUIRES_DEV,
2436 };
2437
2438 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2439 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2440 MODULE_LICENSE("GPL");
2441
2442 module_init(init_reiserfs_fs);
2443 module_exit(exit_reiserfs_fs);