fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <linux/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/backing-dev.h>
  25 #include <linux/buffer_head.h>
  26 #include <linux/exportfs.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/vfs.h>
  29 #include <linux/mount.h>
  30 #include <linux/namei.h>
  31 #include <linux/crc32.h>
  32 #include <linux/seq_file.h>
  33
  34 struct file_system_type reiserfs_fs_type;
  35
  36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  39
  40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  41 {
  42         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  43                         strlen(reiserfs_3_5_magic_string));
  44 }
  45
  46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  47 {
  48         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  49                         strlen(reiserfs_3_6_magic_string));
  50 }
  51
  52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  53 {
  54         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  55                         strlen(reiserfs_jr_magic_string));
  56 }
  57
  58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  59 {
  60         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  61                 is_reiserfs_jr(rs));
  62 }
  63
  64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         /* Avoid clobbering the cancel state... */
  94         if (sbi->work_queued == 1)
  95                 sbi->work_queued = 0;
  96         spin_unlock(&sbi->old_work_lock);
  97
  98         reiserfs_sync_fs(s, 1);
  99 }
 100
 101 void reiserfs_schedule_old_flush(struct super_block *s)
 102 {
 103         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 104         unsigned long delay;
 105
 106         /*
 107          * Avoid scheduling flush when sb is being shut down. It can race
 108          * with journal shutdown and free still queued delayed work.
 109          */
 110         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 111                 return;
 112
 113         spin_lock(&sbi->old_work_lock);
 114         if (!sbi->work_queued) {
 115                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 116                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 117                 sbi->work_queued = 1;
 118         }
 119         spin_unlock(&sbi->old_work_lock);
 120 }
 121
 122 void reiserfs_cancel_old_flush(struct super_block *s)
 123 {
 124         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 125
 126         spin_lock(&sbi->old_work_lock);
 127         /* Make sure no new flushes will be queued */
 128         sbi->work_queued = 2;
 129         spin_unlock(&sbi->old_work_lock);
 130         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 131 }
 132
 133 static int reiserfs_freeze(struct super_block *s)
 134 {
 135         struct reiserfs_transaction_handle th;
 136
 137         reiserfs_cancel_old_flush(s);
 138
 139         reiserfs_write_lock(s);
 140         if (!(s->s_flags & MS_RDONLY)) {
 141                 int err = journal_begin(&th, s, 1);
 142                 if (err) {
 143                         reiserfs_block_writes(&th);
 144                 } else {
 145                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 146                                                      1);
 147                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 148                         reiserfs_block_writes(&th);
 149                         journal_end_sync(&th);
 150                 }
 151         }
 152         reiserfs_write_unlock(s);
 153         return 0;
 154 }
 155
 156 static int reiserfs_unfreeze(struct super_block *s)
 157 {
 158         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 159
 160         reiserfs_allow_writes(s);
 161         spin_lock(&sbi->old_work_lock);
 162         /* Allow old_work to run again */
 163         sbi->work_queued = 0;
 164         spin_unlock(&sbi->old_work_lock);
 165         return 0;
 166 }
 167
 168 extern const struct in_core_key MAX_IN_CORE_KEY;
 169
 170 /*
 171  * this is used to delete "save link" when there are no items of a
 172  * file it points to. It can either happen if unlink is completed but
 173  * "save unlink" removal, or if file has both unlink and truncate
 174  * pending and as unlink completes first (because key of "save link"
 175  * protecting unlink is bigger that a key lf "save link" which
 176  * protects truncate), so there left no items to make truncate
 177  * completion on
 178  */
 179 static int remove_save_link_only(struct super_block *s,
 180                                  struct reiserfs_key *key, int oid_free)
 181 {
 182         struct reiserfs_transaction_handle th;
 183         int err;
 184
 185         /* we are going to do one balancing */
 186         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 187         if (err)
 188                 return err;
 189
 190         reiserfs_delete_solid_item(&th, NULL, key);
 191         if (oid_free)
 192                 /* removals are protected by direct items */
 193                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 194
 195         return journal_end(&th);
 196 }
 197
 198 #ifdef CONFIG_QUOTA
 199 static int reiserfs_quota_on_mount(struct super_block *, int);
 200 #endif
 201
 202 /*
 203  * Look for uncompleted unlinks and truncates and complete them
 204  *
 205  * Called with superblock write locked.  If quotas are enabled, we have to
 206  * release/retake lest we call dquot_quota_on_mount(), proceed to
 207  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
 208  * cpu worklets to complete flush_async_commits() that in turn wait for the
 209  * superblock write lock.
 210  */
 211 static int finish_unfinished(struct super_block *s)
 212 {
 213         INITIALIZE_PATH(path);
 214         struct cpu_key max_cpu_key, obj_key;
 215         struct reiserfs_key save_link_key, last_inode_key;
 216         int retval = 0;
 217         struct item_head *ih;
 218         struct buffer_head *bh;
 219         int item_pos;
 220         char *item;
 221         int done;
 222         struct inode *inode;
 223         int truncate;
 224 #ifdef CONFIG_QUOTA
 225         int i;
 226         int ms_active_set;
 227         int quota_enabled[REISERFS_MAXQUOTAS];
 228 #endif
 229
 230         /* compose key to look for "save" links */
 231         max_cpu_key.version = KEY_FORMAT_3_5;
 232         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 233         max_cpu_key.on_disk_key.k_objectid = ~0U;
 234         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 235         max_cpu_key.key_length = 3;
 236
 237         memset(&last_inode_key, 0, sizeof(last_inode_key));
 238
 239 #ifdef CONFIG_QUOTA
 240         /* Needed for iput() to work correctly and not trash data */
 241         if (s->s_flags & MS_ACTIVE) {
 242                 ms_active_set = 0;
 243         } else {
 244                 ms_active_set = 1;
 245                 s->s_flags |= MS_ACTIVE;
 246         }
 247         /* Turn on quotas so that they are updated correctly */
 248         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 249                 quota_enabled[i] = 1;
 250                 if (REISERFS_SB(s)->s_qf_names[i]) {
 251                         int ret;
 252
 253                         if (sb_has_quota_active(s, i)) {
 254                                 quota_enabled[i] = 0;
 255                                 continue;
 256                         }
 257                         reiserfs_write_unlock(s);
 258                         ret = reiserfs_quota_on_mount(s, i);
 259                         reiserfs_write_lock(s);
 260                         if (ret < 0)
 261                                 reiserfs_warning(s, "reiserfs-2500",
 262                                                  "cannot turn on journaled "
 263                                                  "quota: error %d", ret);
 264                 }
 265         }
 266 #endif
 267
 268         done = 0;
 269         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 270         while (!retval) {
 271                 int depth;
 272                 retval = search_item(s, &max_cpu_key, &path);
 273                 if (retval != ITEM_NOT_FOUND) {
 274                         reiserfs_error(s, "vs-2140",
 275                                        "search_by_key returned %d", retval);
 276                         break;
 277                 }
 278
 279                 bh = get_last_bh(&path);
 280                 item_pos = get_item_pos(&path);
 281                 if (item_pos != B_NR_ITEMS(bh)) {
 282                         reiserfs_warning(s, "vs-2060",
 283                                          "wrong position found");
 284                         break;
 285                 }
 286                 item_pos--;
 287                 ih = item_head(bh, item_pos);
 288
 289                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 290                         /* there are no "save" links anymore */
 291                         break;
 292
 293                 save_link_key = ih->ih_key;
 294                 if (is_indirect_le_ih(ih))
 295                         truncate = 1;
 296                 else
 297                         truncate = 0;
 298
 299                 /* reiserfs_iget needs k_dirid and k_objectid only */
 300                 item = ih_item_body(bh, ih);
 301                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 302                 obj_key.on_disk_key.k_objectid =
 303                     le32_to_cpu(ih->ih_key.k_objectid);
 304                 obj_key.on_disk_key.k_offset = 0;
 305                 obj_key.on_disk_key.k_type = 0;
 306
 307                 pathrelse(&path);
 308
 309                 inode = reiserfs_iget(s, &obj_key);
 310                 if (!inode) {
 311                         /*
 312                          * the unlink almost completed, it just did not
 313                          * manage to remove "save" link and release objectid
 314                          */
 315                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 316                                          &obj_key);
 317                         retval = remove_save_link_only(s, &save_link_key, 1);
 318                         continue;
 319                 }
 320
 321                 if (!truncate && inode->i_nlink) {
 322                         /* file is not unlinked */
 323                         reiserfs_warning(s, "vs-2185",
 324                                          "file %K is not unlinked",
 325                                          &obj_key);
 326                         retval = remove_save_link_only(s, &save_link_key, 0);
 327                         continue;
 328                 }
 329                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 330                 dquot_initialize(inode);
 331                 reiserfs_write_lock_nested(inode->i_sb, depth);
 332
 333                 if (truncate && S_ISDIR(inode->i_mode)) {
 334                         /*
 335                          * We got a truncate request for a dir which
 336                          * is impossible.  The only imaginable way is to
 337                          * execute unfinished truncate request then boot
 338                          * into old kernel, remove the file and create dir
 339                          * with the same key.
 340                          */
 341                         reiserfs_warning(s, "green-2101",
 342                                          "impossible truncate on a "
 343                                          "directory %k. Please report",
 344                                          INODE_PKEY(inode));
 345                         retval = remove_save_link_only(s, &save_link_key, 0);
 346                         truncate = 0;
 347                         iput(inode);
 348                         continue;
 349                 }
 350
 351                 if (truncate) {
 352                         REISERFS_I(inode)->i_flags |=
 353                             i_link_saved_truncate_mask;
 354                         /*
 355                          * not completed truncate found. New size was
 356                          * committed together with "save" link
 357                          */
 358                         reiserfs_info(s, "Truncating %k to %lld ..",
 359                                       INODE_PKEY(inode), inode->i_size);
 360
 361                         /* don't update modification time */
 362                         reiserfs_truncate_file(inode, 0);
 363
 364                         retval = remove_save_link(inode, truncate);
 365                 } else {
 366                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 367                         /* not completed unlink (rmdir) found */
 368                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 369                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 370                                         sizeof(last_inode_key))){
 371                                 last_inode_key = *INODE_PKEY(inode);
 372                                 /* removal gets completed in iput */
 373                                 retval = 0;
 374                         } else {
 375                                 reiserfs_warning(s, "super-2189", "Dead loop "
 376                                                  "in finish_unfinished "
 377                                                  "detected, just remove "
 378                                                  "save link\n");
 379                                 retval = remove_save_link_only(s,
 380                                                         &save_link_key, 0);
 381                         }
 382                 }
 383
 384                 iput(inode);
 385                 printk("done\n");
 386                 done++;
 387         }
 388         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 389
 390 #ifdef CONFIG_QUOTA
 391         /* Turn quotas off */
 392         reiserfs_write_unlock(s);
 393         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 394                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 395                         dquot_quota_off(s, i);
 396         }
 397         reiserfs_write_lock(s);
 398         if (ms_active_set)
 399                 /* Restore the flag back */
 400                 s->s_flags &= ~MS_ACTIVE;
 401 #endif
 402         pathrelse(&path);
 403         if (done)
 404                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 405                               "Completed\n", done);
 406         return retval;
 407 }
 408
 409 /*
 410  * to protect file being unlinked from getting lost we "safe" link files
 411  * being unlinked. This link will be deleted in the same transaction with last
 412  * item of file. mounting the filesystem we scan all these links and remove
 413  * files which almost got lost
 414  */
 415 void add_save_link(struct reiserfs_transaction_handle *th,
 416                    struct inode *inode, int truncate)
 417 {
 418         INITIALIZE_PATH(path);
 419         int retval;
 420         struct cpu_key key;
 421         struct item_head ih;
 422         __le32 link;
 423
 424         BUG_ON(!th->t_trans_id);
 425
 426         /* file can only get one "save link" of each kind */
 427         RFALSE(truncate &&
 428                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 429                "saved link already exists for truncated inode %lx",
 430                (long)inode->i_ino);
 431         RFALSE(!truncate &&
 432                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 433                "saved link already exists for unlinked inode %lx",
 434                (long)inode->i_ino);
 435
 436         /* setup key of "save" link */
 437         key.version = KEY_FORMAT_3_5;
 438         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 439         key.on_disk_key.k_objectid = inode->i_ino;
 440         if (!truncate) {
 441                 /* unlink, rmdir, rename */
 442                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 443                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 444
 445                 /* item head of "safe" link */
 446                 make_le_item_head(&ih, &key, key.version,
 447                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 448                                   4 /*length */ , 0xffff /*free space */ );
 449         } else {
 450                 /* truncate */
 451                 if (S_ISDIR(inode->i_mode))
 452                         reiserfs_warning(inode->i_sb, "green-2102",
 453                                          "Adding a truncate savelink for "
 454                                          "a directory %k! Please report",
 455                                          INODE_PKEY(inode));
 456                 set_cpu_key_k_offset(&key, 1);
 457                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 458
 459                 /* item head of "safe" link */
 460                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 461                                   4 /*length */ , 0 /*free space */ );
 462         }
 463         key.key_length = 3;
 464
 465         /* look for its place in the tree */
 466         retval = search_item(inode->i_sb, &key, &path);
 467         if (retval != ITEM_NOT_FOUND) {
 468                 if (retval != -ENOSPC)
 469                         reiserfs_error(inode->i_sb, "vs-2100",
 470                                        "search_by_key (%K) returned %d", &key,
 471                                        retval);
 472                 pathrelse(&path);
 473                 return;
 474         }
 475
 476         /* body of "save" link */
 477         link = INODE_PKEY(inode)->k_dir_id;
 478
 479         /* put "save" link into tree, don't charge quota to anyone */
 480         retval =
 481             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 482         if (retval) {
 483                 if (retval != -ENOSPC)
 484                         reiserfs_error(inode->i_sb, "vs-2120",
 485                                        "insert_item returned %d", retval);
 486         } else {
 487                 if (truncate)
 488                         REISERFS_I(inode)->i_flags |=
 489                             i_link_saved_truncate_mask;
 490                 else
 491                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 492         }
 493 }
 494
 495 /* this opens transaction unlike add_save_link */
 496 int remove_save_link(struct inode *inode, int truncate)
 497 {
 498         struct reiserfs_transaction_handle th;
 499         struct reiserfs_key key;
 500         int err;
 501
 502         /* we are going to do one balancing only */
 503         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 504         if (err)
 505                 return err;
 506
 507         /* setup key of "save" link */
 508         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 509         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 510         if (!truncate) {
 511                 /* unlink, rmdir, rename */
 512                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 513                                     1 + inode->i_sb->s_blocksize);
 514                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 515         } else {
 516                 /* truncate */
 517                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 518                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 519         }
 520
 521         if ((truncate &&
 522              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 523             (!truncate &&
 524              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 525                 /* don't take quota bytes from anywhere */
 526                 reiserfs_delete_solid_item(&th, NULL, &key);
 527         if (!truncate) {
 528                 reiserfs_release_objectid(&th, inode->i_ino);
 529                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 530         } else
 531                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 532
 533         return journal_end(&th);
 534 }
 535
 536 static void reiserfs_kill_sb(struct super_block *s)
 537 {
 538         if (REISERFS_SB(s)) {
 539                 reiserfs_proc_info_done(s);
 540                 /*
 541                  * Force any pending inode evictions to occur now. Any
 542                  * inodes to be removed that have extended attributes
 543                  * associated with them need to clean them up before
 544                  * we can release the extended attribute root dentries.
 545                  * shrink_dcache_for_umount will BUG if we don't release
 546                  * those before it's called so ->put_super is too late.
 547                  */
 548                 shrink_dcache_sb(s);
 549
 550                 dput(REISERFS_SB(s)->xattr_root);
 551                 REISERFS_SB(s)->xattr_root = NULL;
 552                 dput(REISERFS_SB(s)->priv_root);
 553                 REISERFS_SB(s)->priv_root = NULL;
 554         }
 555
 556         kill_block_super(s);
 557 }
 558
 559 static void reiserfs_put_super(struct super_block *s)
 560 {
 561         struct reiserfs_transaction_handle th;
 562         th.t_trans_id = 0;
 563
 564         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 565
 566         reiserfs_write_lock(s);
 567
 568         /*
 569          * change file system state to current state if it was mounted
 570          * with read-write permissions
 571          */
 572         if (!(s->s_flags & MS_RDONLY)) {
 573                 if (!journal_begin(&th, s, 10)) {
 574                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 575                                                      1);
 576                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 577                                             REISERFS_SB(s)->s_mount_state);
 578                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 579                 }
 580         }
 581
 582         /*
 583          * note, journal_release checks for readonly mount, and can
 584          * decide not to do a journal_end
 585          */
 586         journal_release(&th, s);
 587
 588         reiserfs_free_bitmap_cache(s);
 589
 590         brelse(SB_BUFFER_WITH_SB(s));
 591
 592         print_statistics(s);
 593
 594         if (REISERFS_SB(s)->reserved_blocks != 0) {
 595                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 596                                  REISERFS_SB(s)->reserved_blocks);
 597         }
 598
 599         reiserfs_write_unlock(s);
 600         mutex_destroy(&REISERFS_SB(s)->lock);
 601         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 602         kfree(REISERFS_SB(s)->s_jdev);
 603         kfree(s->s_fs_info);
 604         s->s_fs_info = NULL;
 605 }
 606
 607 static struct kmem_cache *reiserfs_inode_cachep;
 608
 609 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 610 {
 611         struct reiserfs_inode_info *ei;
 612         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 613         if (!ei)
 614                 return NULL;
 615         atomic_set(&ei->openers, 0);
 616         mutex_init(&ei->tailpack);
 617 #ifdef CONFIG_QUOTA
 618         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 619 #endif
 620
 621         return &ei->vfs_inode;
 622 }
 623
 624 static void reiserfs_i_callback(struct rcu_head *head)
 625 {
 626         struct inode *inode = container_of(head, struct inode, i_rcu);
 627         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 628 }
 629
 630 static void reiserfs_destroy_inode(struct inode *inode)
 631 {
 632         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 633 }
 634
 635 static void init_once(void *foo)
 636 {
 637         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 638
 639         INIT_LIST_HEAD(&ei->i_prealloc_list);
 640         inode_init_once(&ei->vfs_inode);
 641 }
 642
 643 static int __init init_inodecache(void)
 644 {
 645         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 646                                                   sizeof(struct
 647                                                          reiserfs_inode_info),
 648                                                   0, (SLAB_RECLAIM_ACCOUNT|
 649                                                         SLAB_MEM_SPREAD),
 650                                                   init_once);
 651         if (reiserfs_inode_cachep == NULL)
 652                 return -ENOMEM;
 653         return 0;
 654 }
 655
 656 static void destroy_inodecache(void)
 657 {
 658         /*
 659          * Make sure all delayed rcu free inodes are flushed before we
 660          * destroy cache.
 661          */
 662         rcu_barrier();
 663         kmem_cache_destroy(reiserfs_inode_cachep);
 664 }
 665
 666 /* we don't mark inodes dirty, we just log them */
 667 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 668 {
 669         struct reiserfs_transaction_handle th;
 670
 671         int err = 0;
 672
 673         if (inode->i_sb->s_flags & MS_RDONLY) {
 674                 reiserfs_warning(inode->i_sb, "clm-6006",
 675                                  "writing inode %lu on readonly FS",
 676                                  inode->i_ino);
 677                 return;
 678         }
 679         reiserfs_write_lock(inode->i_sb);
 680
 681         /*
 682          * this is really only used for atime updates, so they don't have
 683          * to be included in O_SYNC or fsync
 684          */
 685         err = journal_begin(&th, inode->i_sb, 1);
 686         if (err)
 687                 goto out;
 688
 689         reiserfs_update_sd(&th, inode);
 690         journal_end(&th);
 691
 692 out:
 693         reiserfs_write_unlock(inode->i_sb);
 694 }
 695
 696 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 697 {
 698         struct super_block *s = root->d_sb;
 699         struct reiserfs_journal *journal = SB_JOURNAL(s);
 700         long opts = REISERFS_SB(s)->s_mount_opt;
 701
 702         if (opts & (1 << REISERFS_LARGETAIL))
 703                 seq_puts(seq, ",tails=on");
 704         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 705                 seq_puts(seq, ",notail");
 706         /* tails=small is default so we don't show it */
 707
 708         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 709                 seq_puts(seq, ",barrier=none");
 710         /* barrier=flush is default so we don't show it */
 711
 712         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 713                 seq_puts(seq, ",errors=continue");
 714         else if (opts & (1 << REISERFS_ERROR_PANIC))
 715                 seq_puts(seq, ",errors=panic");
 716         /* errors=ro is default so we don't show it */
 717
 718         if (opts & (1 << REISERFS_DATA_LOG))
 719                 seq_puts(seq, ",data=journal");
 720         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 721                 seq_puts(seq, ",data=writeback");
 722         /* data=ordered is default so we don't show it */
 723
 724         if (opts & (1 << REISERFS_ATTRS))
 725                 seq_puts(seq, ",attrs");
 726
 727         if (opts & (1 << REISERFS_XATTRS_USER))
 728                 seq_puts(seq, ",user_xattr");
 729
 730         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 731                 seq_puts(seq, ",expose_privroot");
 732
 733         if (opts & (1 << REISERFS_POSIXACL))
 734                 seq_puts(seq, ",acl");
 735
 736         if (REISERFS_SB(s)->s_jdev)
 737                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 738
 739         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 740                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 741
 742 #ifdef CONFIG_QUOTA
 743         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 744                 seq_show_option(seq, "usrjquota",
 745                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 746         else if (opts & (1 << REISERFS_USRQUOTA))
 747                 seq_puts(seq, ",usrquota");
 748         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 749                 seq_show_option(seq, "grpjquota",
 750                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 751         else if (opts & (1 << REISERFS_GRPQUOTA))
 752                 seq_puts(seq, ",grpquota");
 753         if (REISERFS_SB(s)->s_jquota_fmt) {
 754                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 755                         seq_puts(seq, ",jqfmt=vfsold");
 756                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 757                         seq_puts(seq, ",jqfmt=vfsv0");
 758         }
 759 #endif
 760
 761         /* Block allocator options */
 762         if (opts & (1 << REISERFS_NO_BORDER))
 763                 seq_puts(seq, ",block-allocator=noborder");
 764         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 765                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 766         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 767                 seq_puts(seq, ",block-allocator=hashed_relocation");
 768         if (opts & (1 << REISERFS_TEST4))
 769                 seq_puts(seq, ",block-allocator=test4");
 770         show_alloc_options(seq, s);
 771         return 0;
 772 }
 773
 774 #ifdef CONFIG_QUOTA
 775 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 776                                     size_t, loff_t);
 777 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 778                                    loff_t);
 779
 780 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 781 {
 782         return REISERFS_I(inode)->i_dquot;
 783 }
 784 #endif
 785
 786 static const struct super_operations reiserfs_sops = {
 787         .alloc_inode = reiserfs_alloc_inode,
 788         .destroy_inode = reiserfs_destroy_inode,
 789         .write_inode = reiserfs_write_inode,
 790         .dirty_inode = reiserfs_dirty_inode,
 791         .evict_inode = reiserfs_evict_inode,
 792         .put_super = reiserfs_put_super,
 793         .sync_fs = reiserfs_sync_fs,
 794         .freeze_fs = reiserfs_freeze,
 795         .unfreeze_fs = reiserfs_unfreeze,
 796         .statfs = reiserfs_statfs,
 797         .remount_fs = reiserfs_remount,
 798         .show_options = reiserfs_show_options,
 799 #ifdef CONFIG_QUOTA
 800         .quota_read = reiserfs_quota_read,
 801         .quota_write = reiserfs_quota_write,
 802         .get_dquots = reiserfs_get_dquots,
 803 #endif
 804 };
 805
 806 #ifdef CONFIG_QUOTA
 807 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 808
 809 static int reiserfs_write_dquot(struct dquot *);
 810 static int reiserfs_acquire_dquot(struct dquot *);
 811 static int reiserfs_release_dquot(struct dquot *);
 812 static int reiserfs_mark_dquot_dirty(struct dquot *);
 813 static int reiserfs_write_info(struct super_block *, int);
 814 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 815
 816 static const struct dquot_operations reiserfs_quota_operations = {
 817         .write_dquot = reiserfs_write_dquot,
 818         .acquire_dquot = reiserfs_acquire_dquot,
 819         .release_dquot = reiserfs_release_dquot,
 820         .mark_dirty = reiserfs_mark_dquot_dirty,
 821         .write_info = reiserfs_write_info,
 822         .alloc_dquot    = dquot_alloc,
 823         .destroy_dquot  = dquot_destroy,
 824 };
 825
 826 static const struct quotactl_ops reiserfs_qctl_operations = {
 827         .quota_on = reiserfs_quota_on,
 828         .quota_off = dquot_quota_off,
 829         .quota_sync = dquot_quota_sync,
 830         .get_state = dquot_get_state,
 831         .set_info = dquot_set_dqinfo,
 832         .get_dqblk = dquot_get_dqblk,
 833         .set_dqblk = dquot_set_dqblk,
 834 };
 835 #endif
 836
 837 static const struct export_operations reiserfs_export_ops = {
 838         .encode_fh = reiserfs_encode_fh,
 839         .fh_to_dentry = reiserfs_fh_to_dentry,
 840         .fh_to_parent = reiserfs_fh_to_parent,
 841         .get_parent = reiserfs_get_parent,
 842 };
 843
 844 /*
 845  * this struct is used in reiserfs_getopt () for containing the value for
 846  * those mount options that have values rather than being toggles.
 847  */
 848 typedef struct {
 849         char *value;
 850         /*
 851          * bitmask which is to set on mount_options bitmask
 852          * when this value is found, 0 is no bits are to be changed.
 853          */
 854         int setmask;
 855         /*
 856          * bitmask which is to clear on mount_options bitmask
 857          * when this value is found, 0 is no bits are to be changed.
 858          * This is applied BEFORE setmask
 859          */
 860         int clrmask;
 861 } arg_desc_t;
 862
 863 /* Set this bit in arg_required to allow empty arguments */
 864 #define REISERFS_OPT_ALLOWEMPTY 31
 865
 866 /*
 867  * this struct is used in reiserfs_getopt() for describing the
 868  * set of reiserfs mount options
 869  */
 870 typedef struct {
 871         char *option_name;
 872
 873         /* 0 if argument is not required, not 0 otherwise */
 874         int arg_required;
 875
 876         /* list of values accepted by an option */
 877         const arg_desc_t *values;
 878
 879         /*
 880          * bitmask which is to set on mount_options bitmask
 881          * when this value is found, 0 is no bits are to be changed.
 882          */
 883         int setmask;
 884
 885         /*
 886          * bitmask which is to clear on mount_options bitmask
 887          * when this value is found, 0 is no bits are to be changed.
 888          * This is applied BEFORE setmask
 889          */
 890         int clrmask;
 891 } opt_desc_t;
 892
 893 /* possible values for -o data= */
 894 static const arg_desc_t logging_mode[] = {
 895         {"ordered", 1 << REISERFS_DATA_ORDERED,
 896          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 897         {"journal", 1 << REISERFS_DATA_LOG,
 898          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 899         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 900          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 901         {.value = NULL}
 902 };
 903
 904 /* possible values for -o barrier= */
 905 static const arg_desc_t barrier_mode[] = {
 906         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 907         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 908         {.value = NULL}
 909 };
 910
 911 /*
 912  * possible values for "-o block-allocator=" and bits which are to be set in
 913  * s_mount_opt of reiserfs specific part of in-core super block
 914  */
 915 static const arg_desc_t balloc[] = {
 916         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 917         {"border", 0, 1 << REISERFS_NO_BORDER},
 918         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 919         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 920         {"test4", 1 << REISERFS_TEST4, 0},
 921         {"notest4", 0, 1 << REISERFS_TEST4},
 922         {NULL, 0, 0}
 923 };
 924
 925 static const arg_desc_t tails[] = {
 926         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 927         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 928         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 929         {NULL, 0, 0}
 930 };
 931
 932 static const arg_desc_t error_actions[] = {
 933         {"panic", 1 << REISERFS_ERROR_PANIC,
 934          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 935         {"ro-remount", 1 << REISERFS_ERROR_RO,
 936          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 937 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 938         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 939          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 940 #endif
 941         {NULL, 0, 0},
 942 };
 943
 944 /*
 945  * proceed only one option from a list *cur - string containing of mount
 946  * options
 947  * opts - array of options which are accepted
 948  * opt_arg - if option is found and requires an argument and if it is specifed
 949  * in the input - pointer to the argument is stored here
 950  * bit_flags - if option requires to set a certain bit - it is set here
 951  * return -1 if unknown option is found, opt->arg_required otherwise
 952  */
 953 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 954                            char **opt_arg, unsigned long *bit_flags)
 955 {
 956         char *p;
 957         /*
 958          * foo=bar,
 959          * ^   ^  ^
 960          * |   |  +-- option_end
 961          * |   +-- arg_start
 962          * +-- option_start
 963          */
 964         const opt_desc_t *opt;
 965         const arg_desc_t *arg;
 966
 967         p = *cur;
 968
 969         /* assume argument cannot contain commas */
 970         *cur = strchr(p, ',');
 971         if (*cur) {
 972                 *(*cur) = '\0';
 973                 (*cur)++;
 974         }
 975
 976         if (!strncmp(p, "alloc=", 6)) {
 977                 /*
 978                  * Ugly special case, probably we should redo options
 979                  * parser so that it can understand several arguments for
 980                  * some options, also so that it can fill several bitfields
 981                  * with option values.
 982                  */
 983                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 984                         return -1;
 985                 } else {
 986                         return 0;
 987                 }
 988         }
 989
 990         /* for every option in the list */
 991         for (opt = opts; opt->option_name; opt++) {
 992                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 993                         if (bit_flags) {
 994                                 if (opt->clrmask ==
 995                                     (1 << REISERFS_UNSUPPORTED_OPT))
 996                                         reiserfs_warning(s, "super-6500",
 997                                                          "%s not supported.\n",
 998                                                          p);
 999                                 else
1000                                         *bit_flags &= ~opt->clrmask;
1001                                 if (opt->setmask ==
1002                                     (1 << REISERFS_UNSUPPORTED_OPT))
1003                                         reiserfs_warning(s, "super-6501",
1004                                                          "%s not supported.\n",
1005                                                          p);
1006                                 else
1007                                         *bit_flags |= opt->setmask;
1008                         }
1009                         break;
1010                 }
1011         }
1012         if (!opt->option_name) {
1013                 reiserfs_warning(s, "super-6502",
1014                                  "unknown mount option \"%s\"", p);
1015                 return -1;
1016         }
1017
1018         p += strlen(opt->option_name);
1019         switch (*p) {
1020         case '=':
1021                 if (!opt->arg_required) {
1022                         reiserfs_warning(s, "super-6503",
1023                                          "the option \"%s\" does not "
1024                                          "require an argument\n",
1025                                          opt->option_name);
1026                         return -1;
1027                 }
1028                 break;
1029
1030         case 0:
1031                 if (opt->arg_required) {
1032                         reiserfs_warning(s, "super-6504",
1033                                          "the option \"%s\" requires an "
1034                                          "argument\n", opt->option_name);
1035                         return -1;
1036                 }
1037                 break;
1038         default:
1039                 reiserfs_warning(s, "super-6505",
1040                                  "head of option \"%s\" is only correct\n",
1041                                  opt->option_name);
1042                 return -1;
1043         }
1044
1045         /*
1046          * move to the argument, or to next option if argument is not
1047          * required
1048          */
1049         p++;
1050
1051         if (opt->arg_required
1052             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1053             && !strlen(p)) {
1054                 /* this catches "option=," if not allowed */
1055                 reiserfs_warning(s, "super-6506",
1056                                  "empty argument for \"%s\"\n",
1057                                  opt->option_name);
1058                 return -1;
1059         }
1060
1061         if (!opt->values) {
1062                 /* *=NULLopt_arg contains pointer to argument */
1063                 *opt_arg = p;
1064                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1065         }
1066
1067         /* values possible for this option are listed in opt->values */
1068         for (arg = opt->values; arg->value; arg++) {
1069                 if (!strcmp(p, arg->value)) {
1070                         if (bit_flags) {
1071                                 *bit_flags &= ~arg->clrmask;
1072                                 *bit_flags |= arg->setmask;
1073                         }
1074                         return opt->arg_required;
1075                 }
1076         }
1077
1078         reiserfs_warning(s, "super-6506",
1079                          "bad value \"%s\" for option \"%s\"\n", p,
1080                          opt->option_name);
1081         return -1;
1082 }
1083
1084 /* returns 0 if something is wrong in option string, 1 - otherwise */
1085 static int reiserfs_parse_options(struct super_block *s,
1086
1087                                   /* string given via mount's -o */
1088                                   char *options,
1089
1090                                   /*
1091                                    * after the parsing phase, contains the
1092                                    * collection of bitflags defining what
1093                                    * mount options were selected.
1094                                    */
1095                                   unsigned long *mount_options,
1096
1097                                   /* strtol-ed from NNN of resize=NNN */
1098                                   unsigned long *blocks,
1099                                   char **jdev_name,
1100                                   unsigned int *commit_max_age,
1101                                   char **qf_names,
1102                                   unsigned int *qfmt)
1103 {
1104         int c;
1105         char *arg = NULL;
1106         char *pos;
1107         opt_desc_t opts[] = {
1108                 /*
1109                  * Compatibility stuff, so that -o notail for old
1110                  * setups still work
1111                  */
1112                 {"tails",.arg_required = 't',.values = tails},
1113                 {"notail",.clrmask =
1114                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1115                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1116                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1117                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1118                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1119 #ifdef CONFIG_REISERFS_FS_XATTR
1120                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1121                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1122 #else
1123                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1124                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1125 #endif
1126 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1127                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1128                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1129 #else
1130                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1131                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1132 #endif
1133                 {.option_name = "nolog"},
1134                 {"replayonly",.setmask = 1 << REPLAYONLY},
1135                 {"block-allocator",.arg_required = 'a',.values = balloc},
1136                 {"data",.arg_required = 'd',.values = logging_mode},
1137                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1138                 {"resize",.arg_required = 'r',.values = NULL},
1139                 {"jdev",.arg_required = 'j',.values = NULL},
1140                 {"nolargeio",.arg_required = 'w',.values = NULL},
1141                 {"commit",.arg_required = 'c',.values = NULL},
1142                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1143                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1144                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1145                 {"errors",.arg_required = 'e',.values = error_actions},
1146                 {"usrjquota",.arg_required =
1147                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1148                 {"grpjquota",.arg_required =
1149                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1150                 {"jqfmt",.arg_required = 'f',.values = NULL},
1151                 {.option_name = NULL}
1152         };
1153
1154         *blocks = 0;
1155         if (!options || !*options)
1156                 /*
1157                  * use default configuration: create tails, journaling on, no
1158                  * conversion to newest format
1159                  */
1160                 return 1;
1161
1162         for (pos = options; pos;) {
1163                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1164                 if (c == -1)
1165                         /* wrong option is given */
1166                         return 0;
1167
1168                 if (c == 'r') {
1169                         char *p;
1170
1171                         p = NULL;
1172                         /* "resize=NNN" or "resize=auto" */
1173
1174                         if (!strcmp(arg, "auto")) {
1175                                 /* From JFS code, to auto-get the size. */
1176                                 *blocks =
1177                                     s->s_bdev->bd_inode->i_size >> s->
1178                                     s_blocksize_bits;
1179                         } else {
1180                                 *blocks = simple_strtoul(arg, &p, 0);
1181                                 if (*p != '\0') {
1182                                         /* NNN does not look like a number */
1183                                         reiserfs_warning(s, "super-6507",
1184                                                          "bad value %s for "
1185                                                          "-oresize\n", arg);
1186                                         return 0;
1187                                 }
1188                         }
1189                 }
1190
1191                 if (c == 'c') {
1192                         char *p = NULL;
1193                         unsigned long val = simple_strtoul(arg, &p, 0);
1194                         /* commit=NNN (time in seconds) */
1195                         if (*p != '\0' || val >= (unsigned int)-1) {
1196                                 reiserfs_warning(s, "super-6508",
1197                                                  "bad value %s for -ocommit\n",
1198                                                  arg);
1199                                 return 0;
1200                         }
1201                         *commit_max_age = (unsigned int)val;
1202                 }
1203
1204                 if (c == 'w') {
1205                         reiserfs_warning(s, "super-6509", "nolargeio option "
1206                                          "is no longer supported");
1207                         return 0;
1208                 }
1209
1210                 if (c == 'j') {
1211                         if (arg && *arg && jdev_name) {
1212                                 /* Hm, already assigned? */
1213                                 if (*jdev_name) {
1214                                         reiserfs_warning(s, "super-6510",
1215                                                          "journal device was "
1216                                                          "already specified to "
1217                                                          "be %s", *jdev_name);
1218                                         return 0;
1219                                 }
1220                                 *jdev_name = arg;
1221                         }
1222                 }
1223 #ifdef CONFIG_QUOTA
1224                 if (c == 'u' || c == 'g') {
1225                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1226
1227                         if (sb_any_quota_loaded(s) &&
1228                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1229                                 reiserfs_warning(s, "super-6511",
1230                                                  "cannot change journaled "
1231                                                  "quota options when quota "
1232                                                  "turned on.");
1233                                 return 0;
1234                         }
1235                         if (*arg) {     /* Some filename specified? */
1236                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1237                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1238                                               arg)) {
1239                                         reiserfs_warning(s, "super-6512",
1240                                                          "%s quota file "
1241                                                          "already specified.",
1242                                                          QTYPE2NAME(qtype));
1243                                         return 0;
1244                                 }
1245                                 if (strchr(arg, '/')) {
1246                                         reiserfs_warning(s, "super-6513",
1247                                                          "quotafile must be "
1248                                                          "on filesystem root.");
1249                                         return 0;
1250                                 }
1251                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1252                                 if (!qf_names[qtype]) {
1253                                         reiserfs_warning(s, "reiserfs-2502",
1254                                                          "not enough memory "
1255                                                          "for storing "
1256                                                          "quotafile name.");
1257                                         return 0;
1258                                 }
1259                                 if (qtype == USRQUOTA)
1260                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1261                                 else
1262                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1263                         } else {
1264                                 if (qf_names[qtype] !=
1265                                     REISERFS_SB(s)->s_qf_names[qtype])
1266                                         kfree(qf_names[qtype]);
1267                                 qf_names[qtype] = NULL;
1268                                 if (qtype == USRQUOTA)
1269                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1270                                 else
1271                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1272                         }
1273                 }
1274                 if (c == 'f') {
1275                         if (!strcmp(arg, "vfsold"))
1276                                 *qfmt = QFMT_VFS_OLD;
1277                         else if (!strcmp(arg, "vfsv0"))
1278                                 *qfmt = QFMT_VFS_V0;
1279                         else {
1280                                 reiserfs_warning(s, "super-6514",
1281                                                  "unknown quota format "
1282                                                  "specified.");
1283                                 return 0;
1284                         }
1285                         if (sb_any_quota_loaded(s) &&
1286                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1287                                 reiserfs_warning(s, "super-6515",
1288                                                  "cannot change journaled "
1289                                                  "quota options when quota "
1290                                                  "turned on.");
1291                                 return 0;
1292                         }
1293                 }
1294 #else
1295                 if (c == 'u' || c == 'g' || c == 'f') {
1296                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1297                                          "quota options not supported.");
1298                         return 0;
1299                 }
1300 #endif
1301         }
1302
1303 #ifdef CONFIG_QUOTA
1304         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1305             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1306                 reiserfs_warning(s, "super-6515",
1307                                  "journaled quota format not specified.");
1308                 return 0;
1309         }
1310         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1311                sb_has_quota_loaded(s, USRQUOTA)) ||
1312             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1313                sb_has_quota_loaded(s, GRPQUOTA))) {
1314                 reiserfs_warning(s, "super-6516", "quota options must "
1315                                  "be present when quota is turned on.");
1316                 return 0;
1317         }
1318 #endif
1319
1320         return 1;
1321 }
1322
1323 static void switch_data_mode(struct super_block *s, unsigned long mode)
1324 {
1325         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1326                                          (1 << REISERFS_DATA_ORDERED) |
1327                                          (1 << REISERFS_DATA_WRITEBACK));
1328         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1329 }
1330
1331 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1332 {
1333         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1334                 if (!reiserfs_data_log(s)) {
1335                         switch_data_mode(s, REISERFS_DATA_LOG);
1336                         reiserfs_info(s, "switching to journaled data mode\n");
1337                 }
1338         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1339                 if (!reiserfs_data_ordered(s)) {
1340                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1341                         reiserfs_info(s, "switching to ordered data mode\n");
1342                 }
1343         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1344                 if (!reiserfs_data_writeback(s)) {
1345                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1346                         reiserfs_info(s, "switching to writeback data mode\n");
1347                 }
1348         }
1349 }
1350
1351 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1352 {
1353         int flush = (1 << REISERFS_BARRIER_FLUSH);
1354         int none = (1 << REISERFS_BARRIER_NONE);
1355         int all_barrier = flush | none;
1356
1357         if (bits & all_barrier) {
1358                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1359                 if (bits & flush) {
1360                         REISERFS_SB(s)->s_mount_opt |= flush;
1361                         printk("reiserfs: enabling write barrier flush mode\n");
1362                 } else if (bits & none) {
1363                         REISERFS_SB(s)->s_mount_opt |= none;
1364                         printk("reiserfs: write barriers turned off\n");
1365                 }
1366         }
1367 }
1368
1369 static void handle_attrs(struct super_block *s)
1370 {
1371         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1372
1373         if (reiserfs_attrs(s)) {
1374                 if (old_format_only(s)) {
1375                         reiserfs_warning(s, "super-6517", "cannot support "
1376                                          "attributes on 3.5.x disk format");
1377                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1378                         return;
1379                 }
1380                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1381                         reiserfs_warning(s, "super-6518", "cannot support "
1382                                          "attributes until flag is set in "
1383                                          "super-block");
1384                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1385                 }
1386         }
1387 }
1388
1389 #ifdef CONFIG_QUOTA
1390 static void handle_quota_files(struct super_block *s, char **qf_names,
1391                                unsigned int *qfmt)
1392 {
1393         int i;
1394
1395         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1396                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1397                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1398                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1399         }
1400         if (*qfmt)
1401                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1402 }
1403 #endif
1404
1405 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1406 {
1407         struct reiserfs_super_block *rs;
1408         struct reiserfs_transaction_handle th;
1409         unsigned long blocks;
1410         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1411         unsigned long safe_mask = 0;
1412         unsigned int commit_max_age = (unsigned int)-1;
1413         struct reiserfs_journal *journal = SB_JOURNAL(s);
1414         char *new_opts = kstrdup(arg, GFP_KERNEL);
1415         int err;
1416         char *qf_names[REISERFS_MAXQUOTAS];
1417         unsigned int qfmt = 0;
1418 #ifdef CONFIG_QUOTA
1419         int i;
1420 #endif
1421
1422         sync_filesystem(s);
1423         reiserfs_write_lock(s);
1424
1425 #ifdef CONFIG_QUOTA
1426         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1427 #endif
1428
1429         rs = SB_DISK_SUPER_BLOCK(s);
1430
1431         if (!reiserfs_parse_options
1432             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1433             qf_names, &qfmt)) {
1434 #ifdef CONFIG_QUOTA
1435                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1436                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1437                                 kfree(qf_names[i]);
1438 #endif
1439                 err = -EINVAL;
1440                 goto out_err_unlock;
1441         }
1442 #ifdef CONFIG_QUOTA
1443         handle_quota_files(s, qf_names, &qfmt);
1444 #endif
1445
1446         handle_attrs(s);
1447
1448         /* Add options that are safe here */
1449         safe_mask |= 1 << REISERFS_SMALLTAIL;
1450         safe_mask |= 1 << REISERFS_LARGETAIL;
1451         safe_mask |= 1 << REISERFS_NO_BORDER;
1452         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1453         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1454         safe_mask |= 1 << REISERFS_TEST4;
1455         safe_mask |= 1 << REISERFS_ATTRS;
1456         safe_mask |= 1 << REISERFS_XATTRS_USER;
1457         safe_mask |= 1 << REISERFS_POSIXACL;
1458         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1459         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1460         safe_mask |= 1 << REISERFS_ERROR_RO;
1461         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1462         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1463         safe_mask |= 1 << REISERFS_USRQUOTA;
1464         safe_mask |= 1 << REISERFS_GRPQUOTA;
1465
1466         /*
1467          * Update the bitmask, taking care to keep
1468          * the bits we're not allowed to change here
1469          */
1470         REISERFS_SB(s)->s_mount_opt =
1471             (REISERFS_SB(s)->
1472              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1473
1474         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1475                 journal->j_max_commit_age = commit_max_age;
1476                 journal->j_max_trans_age = commit_max_age;
1477         } else if (commit_max_age == 0) {
1478                 /* 0 means restore defaults. */
1479                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1480                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1481         }
1482
1483         if (blocks) {
1484                 err = reiserfs_resize(s, blocks);
1485                 if (err != 0)
1486                         goto out_err_unlock;
1487         }
1488
1489         if (*mount_flags & MS_RDONLY) {
1490                 reiserfs_write_unlock(s);
1491                 reiserfs_xattr_init(s, *mount_flags);
1492                 /* remount read-only */
1493                 if (s->s_flags & MS_RDONLY)
1494                         /* it is read-only already */
1495                         goto out_ok_unlocked;
1496
1497                 err = dquot_suspend(s, -1);
1498                 if (err < 0)
1499                         goto out_err;
1500
1501                 /* try to remount file system with read-only permissions */
1502                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1503                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1504                         goto out_ok_unlocked;
1505                 }
1506
1507                 reiserfs_write_lock(s);
1508
1509                 err = journal_begin(&th, s, 10);
1510                 if (err)
1511                         goto out_err_unlock;
1512
1513                 /* Mounting a rw partition read-only. */
1514                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1515                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1516                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1517         } else {
1518                 /* remount read-write */
1519                 if (!(s->s_flags & MS_RDONLY)) {
1520                         reiserfs_write_unlock(s);
1521                         reiserfs_xattr_init(s, *mount_flags);
1522                         goto out_ok_unlocked;   /* We are read-write already */
1523                 }
1524
1525                 if (reiserfs_is_journal_aborted(journal)) {
1526                         err = journal->j_errno;
1527                         goto out_err_unlock;
1528                 }
1529
1530                 handle_data_mode(s, mount_options);
1531                 handle_barrier_mode(s, mount_options);
1532                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1533
1534                 /* now it is safe to call journal_begin */
1535                 s->s_flags &= ~MS_RDONLY;
1536                 err = journal_begin(&th, s, 10);
1537                 if (err)
1538                         goto out_err_unlock;
1539
1540                 /* Mount a partition which is read-only, read-write */
1541                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1542                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1543                 s->s_flags &= ~MS_RDONLY;
1544                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1545                 if (!old_format_only(s))
1546                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1547                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1548                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1549                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1550         }
1551         /* this will force a full flush of all journal lists */
1552         SB_JOURNAL(s)->j_must_wait = 1;
1553         err = journal_end(&th);
1554         if (err)
1555                 goto out_err_unlock;
1556
1557         reiserfs_write_unlock(s);
1558         if (!(*mount_flags & MS_RDONLY)) {
1559                 dquot_resume(s, -1);
1560                 reiserfs_write_lock(s);
1561                 finish_unfinished(s);
1562                 reiserfs_write_unlock(s);
1563                 reiserfs_xattr_init(s, *mount_flags);
1564         }
1565
1566 out_ok_unlocked:
1567         replace_mount_options(s, new_opts);
1568         return 0;
1569
1570 out_err_unlock:
1571         reiserfs_write_unlock(s);
1572 out_err:
1573         kfree(new_opts);
1574         return err;
1575 }
1576
1577 static int read_super_block(struct super_block *s, int offset)
1578 {
1579         struct buffer_head *bh;
1580         struct reiserfs_super_block *rs;
1581         int fs_blocksize;
1582
1583         bh = sb_bread(s, offset / s->s_blocksize);
1584         if (!bh) {
1585                 reiserfs_warning(s, "sh-2006",
1586                                  "bread failed (dev %s, block %lu, size %lu)",
1587                                  s->s_id, offset / s->s_blocksize,
1588                                  s->s_blocksize);
1589                 return 1;
1590         }
1591
1592         rs = (struct reiserfs_super_block *)bh->b_data;
1593         if (!is_any_reiserfs_magic_string(rs)) {
1594                 brelse(bh);
1595                 return 1;
1596         }
1597         /*
1598          * ok, reiserfs signature (old or new) found in at the given offset
1599          */
1600         fs_blocksize = sb_blocksize(rs);
1601         brelse(bh);
1602         sb_set_blocksize(s, fs_blocksize);
1603
1604         bh = sb_bread(s, offset / s->s_blocksize);
1605         if (!bh) {
1606                 reiserfs_warning(s, "sh-2007",
1607                                  "bread failed (dev %s, block %lu, size %lu)",
1608                                  s->s_id, offset / s->s_blocksize,
1609                                  s->s_blocksize);
1610                 return 1;
1611         }
1612
1613         rs = (struct reiserfs_super_block *)bh->b_data;
1614         if (sb_blocksize(rs) != s->s_blocksize) {
1615                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1616                                  "filesystem on (dev %s, block %llu, size %lu)",
1617                                  s->s_id,
1618                                  (unsigned long long)bh->b_blocknr,
1619                                  s->s_blocksize);
1620                 brelse(bh);
1621                 return 1;
1622         }
1623
1624         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1625                 brelse(bh);
1626                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1627                                  "--rebuild-tree run detected. Please run\n"
1628                                  "reiserfsck --rebuild-tree and wait for a "
1629                                  "completion. If that fails\n"
1630                                  "get newer reiserfsprogs package");
1631                 return 1;
1632         }
1633
1634         SB_BUFFER_WITH_SB(s) = bh;
1635         SB_DISK_SUPER_BLOCK(s) = rs;
1636
1637         /*
1638          * magic is of non-standard journal filesystem, look at s_version to
1639          * find which format is in use
1640          */
1641         if (is_reiserfs_jr(rs)) {
1642                 if (sb_version(rs) == REISERFS_VERSION_2)
1643                         reiserfs_info(s, "found reiserfs format \"3.6\""
1644                                       " with non-standard journal\n");
1645                 else if (sb_version(rs) == REISERFS_VERSION_1)
1646                         reiserfs_info(s, "found reiserfs format \"3.5\""
1647                                       " with non-standard journal\n");
1648                 else {
1649                         reiserfs_warning(s, "sh-2012", "found unknown "
1650                                          "format \"%u\" of reiserfs with "
1651                                          "non-standard magic", sb_version(rs));
1652                         return 1;
1653                 }
1654         } else
1655                 /*
1656                  * s_version of standard format may contain incorrect
1657                  * information, so we just look at the magic string
1658                  */
1659                 reiserfs_info(s,
1660                               "found reiserfs format \"%s\" with standard journal\n",
1661                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1662
1663         s->s_op = &reiserfs_sops;
1664         s->s_export_op = &reiserfs_export_ops;
1665 #ifdef CONFIG_QUOTA
1666         s->s_qcop = &reiserfs_qctl_operations;
1667         s->dq_op = &reiserfs_quota_operations;
1668         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1669 #endif
1670
1671         /*
1672          * new format is limited by the 32 bit wide i_blocks field, want to
1673          * be one full block below that.
1674          */
1675         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1676         return 0;
1677 }
1678
1679 /* after journal replay, reread all bitmap and super blocks */
1680 static int reread_meta_blocks(struct super_block *s)
1681 {
1682         ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1683         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1684         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1685                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1686                 return 1;
1687         }
1688
1689         return 0;
1690 }
1691
1692 /* hash detection stuff */
1693
1694 /*
1695  * if root directory is empty - we set default - Yura's - hash and
1696  * warn about it
1697  * FIXME: we look for only one name in a directory. If tea and yura
1698  * both have the same value - we ask user to send report to the
1699  * mailing list
1700  */
1701 static __u32 find_hash_out(struct super_block *s)
1702 {
1703         int retval;
1704         struct inode *inode;
1705         struct cpu_key key;
1706         INITIALIZE_PATH(path);
1707         struct reiserfs_dir_entry de;
1708         struct reiserfs_de_head *deh;
1709         __u32 hash = DEFAULT_HASH;
1710         __u32 deh_hashval, teahash, r5hash, yurahash;
1711
1712         inode = d_inode(s->s_root);
1713
1714         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1715         retval = search_by_entry_key(s, &key, &path, &de);
1716         if (retval == IO_ERROR) {
1717                 pathrelse(&path);
1718                 return UNSET_HASH;
1719         }
1720         if (retval == NAME_NOT_FOUND)
1721                 de.de_entry_num--;
1722
1723         set_de_name_and_namelen(&de);
1724         deh = de.de_deh + de.de_entry_num;
1725
1726         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1727                 /* allow override in this case */
1728                 if (reiserfs_rupasov_hash(s))
1729                         hash = YURA_HASH;
1730                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1731                 goto out;
1732         }
1733
1734         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1735         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1736         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1737         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1738
1739         if ((teahash == r5hash && deh_hashval == r5hash) ||
1740             (teahash == yurahash && deh_hashval == yurahash) ||
1741             (r5hash == yurahash && deh_hashval == yurahash)) {
1742                 reiserfs_warning(s, "reiserfs-2506",
1743                                  "Unable to automatically detect hash "
1744                                  "function. Please mount with -o "
1745                                  "hash={tea,rupasov,r5}");
1746                 hash = UNSET_HASH;
1747                 goto out;
1748         }
1749
1750         if (deh_hashval == yurahash)
1751                 hash = YURA_HASH;
1752         else if (deh_hashval == teahash)
1753                 hash = TEA_HASH;
1754         else if (deh_hashval == r5hash)
1755                 hash = R5_HASH;
1756         else {
1757                 reiserfs_warning(s, "reiserfs-2506",
1758                                  "Unrecognised hash function");
1759                 hash = UNSET_HASH;
1760         }
1761 out:
1762         pathrelse(&path);
1763         return hash;
1764 }
1765
1766 /* finds out which hash names are sorted with */
1767 static int what_hash(struct super_block *s)
1768 {
1769         __u32 code;
1770
1771         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1772
1773         /*
1774          * reiserfs_hash_detect() == true if any of the hash mount options
1775          * were used.  We must check them to make sure the user isn't
1776          * using a bad hash value
1777          */
1778         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1779                 code = find_hash_out(s);
1780
1781         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1782                 /*
1783                  * detection has found the hash, and we must check against the
1784                  * mount options
1785                  */
1786                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1787                         reiserfs_warning(s, "reiserfs-2507",
1788                                          "Error, %s hash detected, "
1789                                          "unable to force rupasov hash",
1790                                          reiserfs_hashname(code));
1791                         code = UNSET_HASH;
1792                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1793                         reiserfs_warning(s, "reiserfs-2508",
1794                                          "Error, %s hash detected, "
1795                                          "unable to force tea hash",
1796                                          reiserfs_hashname(code));
1797                         code = UNSET_HASH;
1798                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1799                         reiserfs_warning(s, "reiserfs-2509",
1800                                          "Error, %s hash detected, "
1801                                          "unable to force r5 hash",
1802                                          reiserfs_hashname(code));
1803                         code = UNSET_HASH;
1804                 }
1805         } else {
1806                 /*
1807                  * find_hash_out was not called or
1808                  * could not determine the hash
1809                  */
1810                 if (reiserfs_rupasov_hash(s)) {
1811                         code = YURA_HASH;
1812                 } else if (reiserfs_tea_hash(s)) {
1813                         code = TEA_HASH;
1814                 } else if (reiserfs_r5_hash(s)) {
1815                         code = R5_HASH;
1816                 }
1817         }
1818
1819         /*
1820          * if we are mounted RW, and we have a new valid hash code, update
1821          * the super
1822          */
1823         if (code != UNSET_HASH &&
1824             !(s->s_flags & MS_RDONLY) &&
1825             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1826                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1827         }
1828         return code;
1829 }
1830
1831 /* return pointer to appropriate function */
1832 static hashf_t hash_function(struct super_block *s)
1833 {
1834         switch (what_hash(s)) {
1835         case TEA_HASH:
1836                 reiserfs_info(s, "Using tea hash to sort names\n");
1837                 return keyed_hash;
1838         case YURA_HASH:
1839                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1840                 return yura_hash;
1841         case R5_HASH:
1842                 reiserfs_info(s, "Using r5 hash to sort names\n");
1843                 return r5_hash;
1844         }
1845         return NULL;
1846 }
1847
1848 /* this is used to set up correct value for old partitions */
1849 static int function2code(hashf_t func)
1850 {
1851         if (func == keyed_hash)
1852                 return TEA_HASH;
1853         if (func == yura_hash)
1854                 return YURA_HASH;
1855         if (func == r5_hash)
1856                 return R5_HASH;
1857
1858         BUG();                  /* should never happen */
1859
1860         return 0;
1861 }
1862
1863 #define SWARN(silent, s, id, ...)                       \
1864         if (!(silent))                          \
1865                 reiserfs_warning(s, id, __VA_ARGS__)
1866
1867 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1868 {
1869         struct inode *root_inode;
1870         struct reiserfs_transaction_handle th;
1871         int old_format = 0;
1872         unsigned long blocks;
1873         unsigned int commit_max_age = 0;
1874         int jinit_done = 0;
1875         struct reiserfs_iget_args args;
1876         struct reiserfs_super_block *rs;
1877         char *jdev_name;
1878         struct reiserfs_sb_info *sbi;
1879         int errval = -EINVAL;
1880         char *qf_names[REISERFS_MAXQUOTAS] = {};
1881         unsigned int qfmt = 0;
1882
1883         save_mount_options(s, data);
1884
1885         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1886         if (!sbi)
1887                 return -ENOMEM;
1888         s->s_fs_info = sbi;
1889         /* Set default values for options: non-aggressive tails, RO on errors */
1890         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1891         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1892         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1893         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1894         sbi->s_alloc_options.preallocmin = 0;
1895         /* Preallocate by 16 blocks (17-1) at once */
1896         sbi->s_alloc_options.preallocsize = 17;
1897         /* setup default block allocator options */
1898         reiserfs_init_alloc_options(s);
1899
1900         spin_lock_init(&sbi->old_work_lock);
1901         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1902         mutex_init(&sbi->lock);
1903         sbi->lock_depth = -1;
1904
1905         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1906                                          s->s_id);
1907         if (!sbi->commit_wq) {
1908                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1909                 errval = -ENOMEM;
1910                 goto error_unlocked;
1911         }
1912
1913         jdev_name = NULL;
1914         if (reiserfs_parse_options
1915             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1916              &commit_max_age, qf_names, &qfmt) == 0) {
1917                 goto error_unlocked;
1918         }
1919         if (jdev_name && jdev_name[0]) {
1920                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1921                 if (!sbi->s_jdev) {
1922                         SWARN(silent, s, "", "Cannot allocate memory for "
1923                                 "journal device name");
1924                         goto error;
1925                 }
1926         }
1927 #ifdef CONFIG_QUOTA
1928         handle_quota_files(s, qf_names, &qfmt);
1929 #endif
1930
1931         if (blocks) {
1932                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1933                 goto error_unlocked;
1934         }
1935
1936         /*
1937          * try old format (undistributed bitmap, super block in 8-th 1k
1938          * block of a device)
1939          */
1940         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1941                 old_format = 1;
1942
1943         /*
1944          * try new format (64-th 1k block), which can contain reiserfs
1945          * super block
1946          */
1947         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1948                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1949                       s->s_id);
1950                 goto error_unlocked;
1951         }
1952
1953         rs = SB_DISK_SUPER_BLOCK(s);
1954         /*
1955          * Let's do basic sanity check to verify that underlying device is not
1956          * smaller than the filesystem. If the check fails then abort and
1957          * scream, because bad stuff will happen otherwise.
1958          */
1959         if (s->s_bdev && s->s_bdev->bd_inode
1960             && i_size_read(s->s_bdev->bd_inode) <
1961             sb_block_count(rs) * sb_blocksize(rs)) {
1962                 SWARN(silent, s, "", "Filesystem cannot be "
1963                       "mounted because it is bigger than the device");
1964                 SWARN(silent, s, "", "You may need to run fsck "
1965                       "or increase size of your LVM partition");
1966                 SWARN(silent, s, "", "Or may be you forgot to "
1967                       "reboot after fdisk when it told you to");
1968                 goto error_unlocked;
1969         }
1970
1971         sbi->s_mount_state = SB_REISERFS_STATE(s);
1972         sbi->s_mount_state = REISERFS_VALID_FS;
1973
1974         if ((errval = reiserfs_init_bitmap_cache(s))) {
1975                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1976                 goto error_unlocked;
1977         }
1978
1979         errval = -EINVAL;
1980 #ifdef CONFIG_REISERFS_CHECK
1981         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1982         SWARN(silent, s, "", "- it is slow mode for debugging.");
1983 #endif
1984
1985         /* make data=ordered the default */
1986         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1987             !reiserfs_data_writeback(s)) {
1988                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1989         }
1990
1991         if (reiserfs_data_log(s)) {
1992                 reiserfs_info(s, "using journaled data mode\n");
1993         } else if (reiserfs_data_ordered(s)) {
1994                 reiserfs_info(s, "using ordered data mode\n");
1995         } else {
1996                 reiserfs_info(s, "using writeback data mode\n");
1997         }
1998         if (reiserfs_barrier_flush(s)) {
1999                 printk("reiserfs: using flush barriers\n");
2000         }
2001
2002         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2003                 SWARN(silent, s, "sh-2022",
2004                       "unable to initialize journal space");
2005                 goto error_unlocked;
2006         } else {
2007                 /*
2008                  * once this is set, journal_release must be called
2009                  * if we error out of the mount
2010                  */
2011                 jinit_done = 1;
2012         }
2013
2014         if (reread_meta_blocks(s)) {
2015                 SWARN(silent, s, "jmacd-9",
2016                       "unable to reread meta blocks after journal init");
2017                 goto error_unlocked;
2018         }
2019
2020         if (replay_only(s))
2021                 goto error_unlocked;
2022
2023         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2024                 SWARN(silent, s, "clm-7000",
2025                       "Detected readonly device, marking FS readonly");
2026                 s->s_flags |= MS_RDONLY;
2027         }
2028         args.objectid = REISERFS_ROOT_OBJECTID;
2029         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2030         root_inode =
2031             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2032                          reiserfs_init_locked_inode, (void *)&args);
2033         if (!root_inode) {
2034                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2035                 goto error_unlocked;
2036         }
2037
2038         /*
2039          * This path assumed to be called with the BKL in the old times.
2040          * Now we have inherited the big reiserfs lock from it and many
2041          * reiserfs helpers called in the mount path and elsewhere require
2042          * this lock to be held even if it's not always necessary. Let's be
2043          * conservative and hold it early. The window can be reduced after
2044          * careful review of the code.
2045          */
2046         reiserfs_write_lock(s);
2047
2048         if (root_inode->i_state & I_NEW) {
2049                 reiserfs_read_locked_inode(root_inode, &args);
2050                 unlock_new_inode(root_inode);
2051         }
2052
2053         s->s_root = d_make_root(root_inode);
2054         if (!s->s_root)
2055                 goto error;
2056         /* define and initialize hash function */
2057         sbi->s_hash_function = hash_function(s);
2058         if (sbi->s_hash_function == NULL) {
2059                 dput(s->s_root);
2060                 s->s_root = NULL;
2061                 goto error;
2062         }
2063
2064         if (is_reiserfs_3_5(rs)
2065             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2066                 set_bit(REISERFS_3_5, &sbi->s_properties);
2067         else if (old_format)
2068                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2069         else
2070                 set_bit(REISERFS_3_6, &sbi->s_properties);
2071
2072         if (!(s->s_flags & MS_RDONLY)) {
2073
2074                 errval = journal_begin(&th, s, 1);
2075                 if (errval) {
2076                         dput(s->s_root);
2077                         s->s_root = NULL;
2078                         goto error;
2079                 }
2080                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2081
2082                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2083                 set_sb_fs_state(rs, 0);
2084
2085                 /*
2086                  * Clear out s_bmap_nr if it would wrap. We can handle this
2087                  * case, but older revisions can't. This will cause the
2088                  * file system to fail mount on those older implementations,
2089                  * avoiding corruption. -jeffm
2090                  */
2091                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2092                     sb_bmap_nr(rs) != 0) {
2093                         reiserfs_warning(s, "super-2030", "This file system "
2094                                         "claims to use %u bitmap blocks in "
2095                                         "its super block, but requires %u. "
2096                                         "Clearing to zero.", sb_bmap_nr(rs),
2097                                         reiserfs_bmap_count(s));
2098
2099                         set_sb_bmap_nr(rs, 0);
2100                 }
2101
2102                 if (old_format_only(s)) {
2103                         /*
2104                          * filesystem of format 3.5 either with standard
2105                          * or non-standard journal
2106                          */
2107                         if (convert_reiserfs(s)) {
2108                                 /* and -o conv is given */
2109                                 if (!silent)
2110                                         reiserfs_info(s,
2111                                                       "converting 3.5 filesystem to the 3.6 format");
2112
2113                                 if (is_reiserfs_3_5(rs))
2114                                         /*
2115                                          * put magic string of 3.6 format.
2116                                          * 2.2 will not be able to
2117                                          * mount this filesystem anymore
2118                                          */
2119                                         memcpy(rs->s_v1.s_magic,
2120                                                reiserfs_3_6_magic_string,
2121                                                sizeof
2122                                                (reiserfs_3_6_magic_string));
2123
2124                                 set_sb_version(rs, REISERFS_VERSION_2);
2125                                 reiserfs_convert_objectid_map_v1(s);
2126                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2127                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2128                         } else if (!silent) {
2129                                 reiserfs_info(s, "using 3.5.x disk format\n");
2130                         }
2131                 } else
2132                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2133
2134
2135                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2136                 errval = journal_end(&th);
2137                 if (errval) {
2138                         dput(s->s_root);
2139                         s->s_root = NULL;
2140                         goto error;
2141                 }
2142
2143                 reiserfs_write_unlock(s);
2144                 if ((errval = reiserfs_lookup_privroot(s)) ||
2145                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2146                         dput(s->s_root);
2147                         s->s_root = NULL;
2148                         goto error_unlocked;
2149                 }
2150                 reiserfs_write_lock(s);
2151
2152                 /*
2153                  * look for files which were to be removed in previous session
2154                  */
2155                 finish_unfinished(s);
2156         } else {
2157                 if (old_format_only(s) && !silent) {
2158                         reiserfs_info(s, "using 3.5.x disk format\n");
2159                 }
2160
2161                 reiserfs_write_unlock(s);
2162                 if ((errval = reiserfs_lookup_privroot(s)) ||
2163                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2164                         dput(s->s_root);
2165                         s->s_root = NULL;
2166                         goto error_unlocked;
2167                 }
2168                 reiserfs_write_lock(s);
2169         }
2170         /*
2171          * mark hash in super block: it could be unset. overwrite should be ok
2172          */
2173         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2174
2175         handle_attrs(s);
2176
2177         reiserfs_proc_info_init(s);
2178
2179         init_waitqueue_head(&(sbi->s_wait));
2180         spin_lock_init(&sbi->bitmap_lock);
2181
2182         reiserfs_write_unlock(s);
2183
2184         return (0);
2185
2186 error:
2187         reiserfs_write_unlock(s);
2188
2189 error_unlocked:
2190         /* kill the commit thread, free journal ram */
2191         if (jinit_done) {
2192                 reiserfs_write_lock(s);
2193                 journal_release_error(NULL, s);
2194                 reiserfs_write_unlock(s);
2195         }
2196
2197         if (sbi->commit_wq)
2198                 destroy_workqueue(sbi->commit_wq);
2199
2200         reiserfs_cancel_old_flush(s);
2201
2202         reiserfs_free_bitmap_cache(s);
2203         if (SB_BUFFER_WITH_SB(s))
2204                 brelse(SB_BUFFER_WITH_SB(s));
2205 #ifdef CONFIG_QUOTA
2206         {
2207                 int j;
2208                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2209                         kfree(qf_names[j]);
2210         }
2211 #endif
2212         kfree(sbi->s_jdev);
2213         kfree(sbi);
2214
2215         s->s_fs_info = NULL;
2216         return errval;
2217 }
2218
2219 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2220 {
2221         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2222
2223         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2224         buf->f_bfree = sb_free_blocks(rs);
2225         buf->f_bavail = buf->f_bfree;
2226         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2227         buf->f_bsize = dentry->d_sb->s_blocksize;
2228         /* changed to accommodate gcc folks. */
2229         buf->f_type = REISERFS_SUPER_MAGIC;
2230         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2231         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2232                                 sizeof(rs->s_uuid)/2);
2233
2234         return 0;
2235 }
2236
2237 #ifdef CONFIG_QUOTA
2238 static int reiserfs_write_dquot(struct dquot *dquot)
2239 {
2240         struct reiserfs_transaction_handle th;
2241         int ret, err;
2242         int depth;
2243
2244         reiserfs_write_lock(dquot->dq_sb);
2245         ret =
2246             journal_begin(&th, dquot->dq_sb,
2247                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2248         if (ret)
2249                 goto out;
2250         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2251         ret = dquot_commit(dquot);
2252         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2253         err = journal_end(&th);
2254         if (!ret && err)
2255                 ret = err;
2256 out:
2257         reiserfs_write_unlock(dquot->dq_sb);
2258         return ret;
2259 }
2260
2261 static int reiserfs_acquire_dquot(struct dquot *dquot)
2262 {
2263         struct reiserfs_transaction_handle th;
2264         int ret, err;
2265         int depth;
2266
2267         reiserfs_write_lock(dquot->dq_sb);
2268         ret =
2269             journal_begin(&th, dquot->dq_sb,
2270                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2271         if (ret)
2272                 goto out;
2273         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2274         ret = dquot_acquire(dquot);
2275         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2276         err = journal_end(&th);
2277         if (!ret && err)
2278                 ret = err;
2279 out:
2280         reiserfs_write_unlock(dquot->dq_sb);
2281         return ret;
2282 }
2283
2284 static int reiserfs_release_dquot(struct dquot *dquot)
2285 {
2286         struct reiserfs_transaction_handle th;
2287         int ret, err;
2288
2289         reiserfs_write_lock(dquot->dq_sb);
2290         ret =
2291             journal_begin(&th, dquot->dq_sb,
2292                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2293         reiserfs_write_unlock(dquot->dq_sb);
2294         if (ret) {
2295                 /* Release dquot anyway to avoid endless cycle in dqput() */
2296                 dquot_release(dquot);
2297                 goto out;
2298         }
2299         ret = dquot_release(dquot);
2300         reiserfs_write_lock(dquot->dq_sb);
2301         err = journal_end(&th);
2302         if (!ret && err)
2303                 ret = err;
2304         reiserfs_write_unlock(dquot->dq_sb);
2305 out:
2306         return ret;
2307 }
2308
2309 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2310 {
2311         /* Are we journaling quotas? */
2312         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2313             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2314                 dquot_mark_dquot_dirty(dquot);
2315                 return reiserfs_write_dquot(dquot);
2316         } else
2317                 return dquot_mark_dquot_dirty(dquot);
2318 }
2319
2320 static int reiserfs_write_info(struct super_block *sb, int type)
2321 {
2322         struct reiserfs_transaction_handle th;
2323         int ret, err;
2324         int depth;
2325
2326         /* Data block + inode block */
2327         reiserfs_write_lock(sb);
2328         ret = journal_begin(&th, sb, 2);
2329         if (ret)
2330                 goto out;
2331         depth = reiserfs_write_unlock_nested(sb);
2332         ret = dquot_commit_info(sb, type);
2333         reiserfs_write_lock_nested(sb, depth);
2334         err = journal_end(&th);
2335         if (!ret && err)
2336                 ret = err;
2337 out:
2338         reiserfs_write_unlock(sb);
2339         return ret;
2340 }
2341
2342 /*
2343  * Turn on quotas during mount time - we need to find the quota file and such...
2344  */
2345 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2346 {
2347         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2348                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2349 }
2350
2351 /*
2352  * Standard function to be called on quota_on
2353  */
2354 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2355                              struct path *path)
2356 {
2357         int err;
2358         struct inode *inode;
2359         struct reiserfs_transaction_handle th;
2360         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2361
2362         reiserfs_write_lock(sb);
2363         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2364                 err = -EINVAL;
2365                 goto out;
2366         }
2367
2368         /* Quotafile not on the same filesystem? */
2369         if (path->dentry->d_sb != sb) {
2370                 err = -EXDEV;
2371                 goto out;
2372         }
2373         inode = d_inode(path->dentry);
2374         /*
2375          * We must not pack tails for quota files on reiserfs for quota
2376          * IO to work
2377          */
2378         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2379                 err = reiserfs_unpack(inode, NULL);
2380                 if (err) {
2381                         reiserfs_warning(sb, "super-6520",
2382                                 "Unpacking tail of quota file failed"
2383                                 " (%d). Cannot turn on quotas.", err);
2384                         err = -EINVAL;
2385                         goto out;
2386                 }
2387                 mark_inode_dirty(inode);
2388         }
2389         /* Journaling quota? */
2390         if (REISERFS_SB(sb)->s_qf_names[type]) {
2391                 /* Quotafile not of fs root? */
2392                 if (path->dentry->d_parent != sb->s_root)
2393                         reiserfs_warning(sb, "super-6521",
2394                                  "Quota file not on filesystem root. "
2395                                  "Journalled quota will not work.");
2396         }
2397
2398         /*
2399          * When we journal data on quota file, we have to flush journal to see
2400          * all updates to the file when we bypass pagecache...
2401          */
2402         if (reiserfs_file_data_log(inode)) {
2403                 /* Just start temporary transaction and finish it */
2404                 err = journal_begin(&th, sb, 1);
2405                 if (err)
2406                         goto out;
2407                 err = journal_end_sync(&th);
2408                 if (err)
2409                         goto out;
2410         }
2411         reiserfs_write_unlock(sb);
2412         return dquot_quota_on(sb, type, format_id, path);
2413 out:
2414         reiserfs_write_unlock(sb);
2415         return err;
2416 }
2417
2418 /*
2419  * Read data from quotafile - avoid pagecache and such because we cannot afford
2420  * acquiring the locks... As quota files are never truncated and quota code
2421  * itself serializes the operations (and no one else should touch the files)
2422  * we don't have to be afraid of races
2423  */
2424 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2425                                    size_t len, loff_t off)
2426 {
2427         struct inode *inode = sb_dqopt(sb)->files[type];
2428         unsigned long blk = off >> sb->s_blocksize_bits;
2429         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2430         size_t toread;
2431         struct buffer_head tmp_bh, *bh;
2432         loff_t i_size = i_size_read(inode);
2433
2434         if (off > i_size)
2435                 return 0;
2436         if (off + len > i_size)
2437                 len = i_size - off;
2438         toread = len;
2439         while (toread > 0) {
2440                 tocopy =
2441                     sb->s_blocksize - offset <
2442                     toread ? sb->s_blocksize - offset : toread;
2443                 tmp_bh.b_state = 0;
2444                 /*
2445                  * Quota files are without tails so we can safely
2446                  * use this function
2447                  */
2448                 reiserfs_write_lock(sb);
2449                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2450                 reiserfs_write_unlock(sb);
2451                 if (err)
2452                         return err;
2453                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2454                         memset(data, 0, tocopy);
2455                 else {
2456                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2457                         if (!bh)
2458                                 return -EIO;
2459                         memcpy(data, bh->b_data + offset, tocopy);
2460                         brelse(bh);
2461                 }
2462                 offset = 0;
2463                 toread -= tocopy;
2464                 data += tocopy;
2465                 blk++;
2466         }
2467         return len;
2468 }
2469
2470 /*
2471  * Write to quotafile (we know the transaction is already started and has
2472  * enough credits)
2473  */
2474 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2475                                     const char *data, size_t len, loff_t off)
2476 {
2477         struct inode *inode = sb_dqopt(sb)->files[type];
2478         unsigned long blk = off >> sb->s_blocksize_bits;
2479         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2480         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2481         size_t towrite = len;
2482         struct buffer_head tmp_bh, *bh;
2483
2484         if (!current->journal_info) {
2485                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2486                         (unsigned long long)off, (unsigned long long)len);
2487                 return -EIO;
2488         }
2489         while (towrite > 0) {
2490                 tocopy = sb->s_blocksize - offset < towrite ?
2491                     sb->s_blocksize - offset : towrite;
2492                 tmp_bh.b_state = 0;
2493                 reiserfs_write_lock(sb);
2494                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2495                 reiserfs_write_unlock(sb);
2496                 if (err)
2497                         goto out;
2498                 if (offset || tocopy != sb->s_blocksize)
2499                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2500                 else
2501                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2502                 if (!bh) {
2503                         err = -EIO;
2504                         goto out;
2505                 }
2506                 lock_buffer(bh);
2507                 memcpy(bh->b_data + offset, data, tocopy);
2508                 flush_dcache_page(bh->b_page);
2509                 set_buffer_uptodate(bh);
2510                 unlock_buffer(bh);
2511                 reiserfs_write_lock(sb);
2512                 reiserfs_prepare_for_journal(sb, bh, 1);
2513                 journal_mark_dirty(current->journal_info, bh);
2514                 if (!journal_quota)
2515                         reiserfs_add_ordered_list(inode, bh);
2516                 reiserfs_write_unlock(sb);
2517                 brelse(bh);
2518                 offset = 0;
2519                 towrite -= tocopy;
2520                 data += tocopy;
2521                 blk++;
2522         }
2523 out:
2524         if (len == towrite)
2525                 return err;
2526         if (inode->i_size < off + len - towrite)
2527                 i_size_write(inode, off + len - towrite);
2528         inode->i_version++;
2529         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2530         mark_inode_dirty(inode);
2531         return len - towrite;
2532 }
2533
2534 #endif
2535
2536 static struct dentry *get_super_block(struct file_system_type *fs_type,
2537                            int flags, const char *dev_name,
2538                            void *data)
2539 {
2540         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2541 }
2542
2543 static int __init init_reiserfs_fs(void)
2544 {
2545         int ret;
2546
2547         ret = init_inodecache();
2548         if (ret)
2549                 return ret;
2550
2551         reiserfs_proc_info_global_init();
2552
2553         ret = register_filesystem(&reiserfs_fs_type);
2554         if (ret)
2555                 goto out;
2556
2557         return 0;
2558 out:
2559         reiserfs_proc_info_global_done();
2560         destroy_inodecache();
2561
2562         return ret;
2563 }
2564
2565 static void __exit exit_reiserfs_fs(void)
2566 {
2567         reiserfs_proc_info_global_done();
2568         unregister_filesystem(&reiserfs_fs_type);
2569         destroy_inodecache();
2570 }
2571
2572 struct file_system_type reiserfs_fs_type = {
2573         .owner = THIS_MODULE,
2574         .name = "reiserfs",
2575         .mount = get_super_block,
2576         .kill_sb = reiserfs_kill_sb,
2577         .fs_flags = FS_REQUIRES_DEV,
2578 };
2579 MODULE_ALIAS_FS("reiserfs");
2580
2581 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2582 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2583 MODULE_LICENSE("GPL");
2584
2585 module_init(init_reiserfs_fs);
2586 module_exit(exit_reiserfs_fs);