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         /*
  93          * We need s_umount for protecting quota writeback. We have to use
  94          * trylock as reiserfs_cancel_old_flush() may be waiting for this work
  95          * to complete with s_umount held.
  96          */
  97         if (!down_read_trylock(&s->s_umount)) {
  98                 /* Requeue work if we are not cancelling it */
  99                 spin_lock(&sbi->old_work_lock);
 100                 if (sbi->work_queued == 1)
 101                         queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
 102                 spin_unlock(&sbi->old_work_lock);
 103                 return;
 104         }
 105         spin_lock(&sbi->old_work_lock);
 106         /* Avoid clobbering the cancel state... */
 107         if (sbi->work_queued == 1)
 108                 sbi->work_queued = 0;
 109         spin_unlock(&sbi->old_work_lock);
 110
 111         reiserfs_sync_fs(s, 1);
 112         up_read(&s->s_umount);
 113 }
 114
 115 void reiserfs_schedule_old_flush(struct super_block *s)
 116 {
 117         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 118         unsigned long delay;
 119
 120         /*
 121          * Avoid scheduling flush when sb is being shut down. It can race
 122          * with journal shutdown and free still queued delayed work.
 123          */
 124         if (sb_rdonly(s) || !(s->s_flags & SB_ACTIVE))
 125                 return;
 126
 127         spin_lock(&sbi->old_work_lock);
 128         if (!sbi->work_queued) {
 129                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 130                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 131                 sbi->work_queued = 1;
 132         }
 133         spin_unlock(&sbi->old_work_lock);
 134 }
 135
 136 void reiserfs_cancel_old_flush(struct super_block *s)
 137 {
 138         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 139
 140         spin_lock(&sbi->old_work_lock);
 141         /* Make sure no new flushes will be queued */
 142         sbi->work_queued = 2;
 143         spin_unlock(&sbi->old_work_lock);
 144         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 145 }
 146
 147 static int reiserfs_freeze(struct super_block *s)
 148 {
 149         struct reiserfs_transaction_handle th;
 150
 151         reiserfs_cancel_old_flush(s);
 152
 153         reiserfs_write_lock(s);
 154         if (!sb_rdonly(s)) {
 155                 int err = journal_begin(&th, s, 1);
 156                 if (err) {
 157                         reiserfs_block_writes(&th);
 158                 } else {
 159                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 160                                                      1);
 161                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 162                         reiserfs_block_writes(&th);
 163                         journal_end_sync(&th);
 164                 }
 165         }
 166         reiserfs_write_unlock(s);
 167         return 0;
 168 }
 169
 170 static int reiserfs_unfreeze(struct super_block *s)
 171 {
 172         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 173
 174         reiserfs_allow_writes(s);
 175         spin_lock(&sbi->old_work_lock);
 176         /* Allow old_work to run again */
 177         sbi->work_queued = 0;
 178         spin_unlock(&sbi->old_work_lock);
 179         return 0;
 180 }
 181
 182 extern const struct in_core_key MAX_IN_CORE_KEY;
 183
 184 /*
 185  * this is used to delete "save link" when there are no items of a
 186  * file it points to. It can either happen if unlink is completed but
 187  * "save unlink" removal, or if file has both unlink and truncate
 188  * pending and as unlink completes first (because key of "save link"
 189  * protecting unlink is bigger that a key lf "save link" which
 190  * protects truncate), so there left no items to make truncate
 191  * completion on
 192  */
 193 static int remove_save_link_only(struct super_block *s,
 194                                  struct reiserfs_key *key, int oid_free)
 195 {
 196         struct reiserfs_transaction_handle th;
 197         int err;
 198
 199         /* we are going to do one balancing */
 200         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 201         if (err)
 202                 return err;
 203
 204         reiserfs_delete_solid_item(&th, NULL, key);
 205         if (oid_free)
 206                 /* removals are protected by direct items */
 207                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 208
 209         return journal_end(&th);
 210 }
 211
 212 #ifdef CONFIG_QUOTA
 213 static int reiserfs_quota_on_mount(struct super_block *, int);
 214 #endif
 215
 216 /*
 217  * Look for uncompleted unlinks and truncates and complete them
 218  *
 219  * Called with superblock write locked.  If quotas are enabled, we have to
 220  * release/retake lest we call dquot_quota_on_mount(), proceed to
 221  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
 222  * cpu worklets to complete flush_async_commits() that in turn wait for the
 223  * superblock write lock.
 224  */
 225 static int finish_unfinished(struct super_block *s)
 226 {
 227         INITIALIZE_PATH(path);
 228         struct cpu_key max_cpu_key, obj_key;
 229         struct reiserfs_key save_link_key, last_inode_key;
 230         int retval = 0;
 231         struct item_head *ih;
 232         struct buffer_head *bh;
 233         int item_pos;
 234         char *item;
 235         int done;
 236         struct inode *inode;
 237         int truncate;
 238 #ifdef CONFIG_QUOTA
 239         int i;
 240         int ms_active_set;
 241         int quota_enabled[REISERFS_MAXQUOTAS];
 242 #endif
 243
 244         /* compose key to look for "save" links */
 245         max_cpu_key.version = KEY_FORMAT_3_5;
 246         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 247         max_cpu_key.on_disk_key.k_objectid = ~0U;
 248         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 249         max_cpu_key.key_length = 3;
 250
 251         memset(&last_inode_key, 0, sizeof(last_inode_key));
 252
 253 #ifdef CONFIG_QUOTA
 254         /* Needed for iput() to work correctly and not trash data */
 255         if (s->s_flags & SB_ACTIVE) {
 256                 ms_active_set = 0;
 257         } else {
 258                 ms_active_set = 1;
 259                 s->s_flags |= SB_ACTIVE;
 260         }
 261         /* Turn on quotas so that they are updated correctly */
 262         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 263                 quota_enabled[i] = 1;
 264                 if (REISERFS_SB(s)->s_qf_names[i]) {
 265                         int ret;
 266
 267                         if (sb_has_quota_active(s, i)) {
 268                                 quota_enabled[i] = 0;
 269                                 continue;
 270                         }
 271                         reiserfs_write_unlock(s);
 272                         ret = reiserfs_quota_on_mount(s, i);
 273                         reiserfs_write_lock(s);
 274                         if (ret < 0)
 275                                 reiserfs_warning(s, "reiserfs-2500",
 276                                                  "cannot turn on journaled "
 277                                                  "quota: error %d", ret);
 278                 }
 279         }
 280 #endif
 281
 282         done = 0;
 283         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 284         while (!retval) {
 285                 int depth;
 286                 retval = search_item(s, &max_cpu_key, &path);
 287                 if (retval != ITEM_NOT_FOUND) {
 288                         reiserfs_error(s, "vs-2140",
 289                                        "search_by_key returned %d", retval);
 290                         break;
 291                 }
 292
 293                 bh = get_last_bh(&path);
 294                 item_pos = get_item_pos(&path);
 295                 if (item_pos != B_NR_ITEMS(bh)) {
 296                         reiserfs_warning(s, "vs-2060",
 297                                          "wrong position found");
 298                         break;
 299                 }
 300                 item_pos--;
 301                 ih = item_head(bh, item_pos);
 302
 303                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 304                         /* there are no "save" links anymore */
 305                         break;
 306
 307                 save_link_key = ih->ih_key;
 308                 if (is_indirect_le_ih(ih))
 309                         truncate = 1;
 310                 else
 311                         truncate = 0;
 312
 313                 /* reiserfs_iget needs k_dirid and k_objectid only */
 314                 item = ih_item_body(bh, ih);
 315                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 316                 obj_key.on_disk_key.k_objectid =
 317                     le32_to_cpu(ih->ih_key.k_objectid);
 318                 obj_key.on_disk_key.k_offset = 0;
 319                 obj_key.on_disk_key.k_type = 0;
 320
 321                 pathrelse(&path);
 322
 323                 inode = reiserfs_iget(s, &obj_key);
 324                 if (IS_ERR_OR_NULL(inode)) {
 325                         /*
 326                          * the unlink almost completed, it just did not
 327                          * manage to remove "save" link and release objectid
 328                          */
 329                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 330                                          &obj_key);
 331                         retval = remove_save_link_only(s, &save_link_key, 1);
 332                         continue;
 333                 }
 334
 335                 if (!truncate && inode->i_nlink) {
 336                         /* file is not unlinked */
 337                         reiserfs_warning(s, "vs-2185",
 338                                          "file %K is not unlinked",
 339                                          &obj_key);
 340                         retval = remove_save_link_only(s, &save_link_key, 0);
 341                         continue;
 342                 }
 343                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 344                 dquot_initialize(inode);
 345                 reiserfs_write_lock_nested(inode->i_sb, depth);
 346
 347                 if (truncate && S_ISDIR(inode->i_mode)) {
 348                         /*
 349                          * We got a truncate request for a dir which
 350                          * is impossible.  The only imaginable way is to
 351                          * execute unfinished truncate request then boot
 352                          * into old kernel, remove the file and create dir
 353                          * with the same key.
 354                          */
 355                         reiserfs_warning(s, "green-2101",
 356                                          "impossible truncate on a "
 357                                          "directory %k. Please report",
 358                                          INODE_PKEY(inode));
 359                         retval = remove_save_link_only(s, &save_link_key, 0);
 360                         truncate = 0;
 361                         iput(inode);
 362                         continue;
 363                 }
 364
 365                 if (truncate) {
 366                         REISERFS_I(inode)->i_flags |=
 367                             i_link_saved_truncate_mask;
 368                         /*
 369                          * not completed truncate found. New size was
 370                          * committed together with "save" link
 371                          */
 372                         reiserfs_info(s, "Truncating %k to %lld ..",
 373                                       INODE_PKEY(inode), inode->i_size);
 374
 375                         /* don't update modification time */
 376                         reiserfs_truncate_file(inode, 0);
 377
 378                         retval = remove_save_link(inode, truncate);
 379                 } else {
 380                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 381                         /* not completed unlink (rmdir) found */
 382                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 383                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 384                                         sizeof(last_inode_key))){
 385                                 last_inode_key = *INODE_PKEY(inode);
 386                                 /* removal gets completed in iput */
 387                                 retval = 0;
 388                         } else {
 389                                 reiserfs_warning(s, "super-2189", "Dead loop "
 390                                                  "in finish_unfinished "
 391                                                  "detected, just remove "
 392                                                  "save link\n");
 393                                 retval = remove_save_link_only(s,
 394                                                         &save_link_key, 0);
 395                         }
 396                 }
 397
 398                 iput(inode);
 399                 printk("done\n");
 400                 done++;
 401         }
 402         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 403
 404 #ifdef CONFIG_QUOTA
 405         /* Turn quotas off */
 406         reiserfs_write_unlock(s);
 407         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 408                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 409                         dquot_quota_off(s, i);
 410         }
 411         reiserfs_write_lock(s);
 412         if (ms_active_set)
 413                 /* Restore the flag back */
 414                 s->s_flags &= ~SB_ACTIVE;
 415 #endif
 416         pathrelse(&path);
 417         if (done)
 418                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 419                               "Completed\n", done);
 420         return retval;
 421 }
 422
 423 /*
 424  * to protect file being unlinked from getting lost we "safe" link files
 425  * being unlinked. This link will be deleted in the same transaction with last
 426  * item of file. mounting the filesystem we scan all these links and remove
 427  * files which almost got lost
 428  */
 429 void add_save_link(struct reiserfs_transaction_handle *th,
 430                    struct inode *inode, int truncate)
 431 {
 432         INITIALIZE_PATH(path);
 433         int retval;
 434         struct cpu_key key;
 435         struct item_head ih;
 436         __le32 link;
 437
 438         BUG_ON(!th->t_trans_id);
 439
 440         /* file can only get one "save link" of each kind */
 441         RFALSE(truncate &&
 442                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 443                "saved link already exists for truncated inode %lx",
 444                (long)inode->i_ino);
 445         RFALSE(!truncate &&
 446                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 447                "saved link already exists for unlinked inode %lx",
 448                (long)inode->i_ino);
 449
 450         /* setup key of "save" link */
 451         key.version = KEY_FORMAT_3_5;
 452         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 453         key.on_disk_key.k_objectid = inode->i_ino;
 454         if (!truncate) {
 455                 /* unlink, rmdir, rename */
 456                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 457                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 458
 459                 /* item head of "safe" link */
 460                 make_le_item_head(&ih, &key, key.version,
 461                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 462                                   4 /*length */ , 0xffff /*free space */ );
 463         } else {
 464                 /* truncate */
 465                 if (S_ISDIR(inode->i_mode))
 466                         reiserfs_warning(inode->i_sb, "green-2102",
 467                                          "Adding a truncate savelink for "
 468                                          "a directory %k! Please report",
 469                                          INODE_PKEY(inode));
 470                 set_cpu_key_k_offset(&key, 1);
 471                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 472
 473                 /* item head of "safe" link */
 474                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 475                                   4 /*length */ , 0 /*free space */ );
 476         }
 477         key.key_length = 3;
 478
 479         /* look for its place in the tree */
 480         retval = search_item(inode->i_sb, &key, &path);
 481         if (retval != ITEM_NOT_FOUND) {
 482                 if (retval != -ENOSPC)
 483                         reiserfs_error(inode->i_sb, "vs-2100",
 484                                        "search_by_key (%K) returned %d", &key,
 485                                        retval);
 486                 pathrelse(&path);
 487                 return;
 488         }
 489
 490         /* body of "save" link */
 491         link = INODE_PKEY(inode)->k_dir_id;
 492
 493         /* put "save" link into tree, don't charge quota to anyone */
 494         retval =
 495             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 496         if (retval) {
 497                 if (retval != -ENOSPC)
 498                         reiserfs_error(inode->i_sb, "vs-2120",
 499                                        "insert_item returned %d", retval);
 500         } else {
 501                 if (truncate)
 502                         REISERFS_I(inode)->i_flags |=
 503                             i_link_saved_truncate_mask;
 504                 else
 505                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 506         }
 507 }
 508
 509 /* this opens transaction unlike add_save_link */
 510 int remove_save_link(struct inode *inode, int truncate)
 511 {
 512         struct reiserfs_transaction_handle th;
 513         struct reiserfs_key key;
 514         int err;
 515
 516         /* we are going to do one balancing only */
 517         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 518         if (err)
 519                 return err;
 520
 521         /* setup key of "save" link */
 522         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 523         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 524         if (!truncate) {
 525                 /* unlink, rmdir, rename */
 526                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 527                                     1 + inode->i_sb->s_blocksize);
 528                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 529         } else {
 530                 /* truncate */
 531                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 532                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 533         }
 534
 535         if ((truncate &&
 536              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 537             (!truncate &&
 538              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 539                 /* don't take quota bytes from anywhere */
 540                 reiserfs_delete_solid_item(&th, NULL, &key);
 541         if (!truncate) {
 542                 reiserfs_release_objectid(&th, inode->i_ino);
 543                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 544         } else
 545                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 546
 547         return journal_end(&th);
 548 }
 549
 550 static void reiserfs_kill_sb(struct super_block *s)
 551 {
 552         if (REISERFS_SB(s)) {
 553                 reiserfs_proc_info_done(s);
 554                 /*
 555                  * Force any pending inode evictions to occur now. Any
 556                  * inodes to be removed that have extended attributes
 557                  * associated with them need to clean them up before
 558                  * we can release the extended attribute root dentries.
 559                  * shrink_dcache_for_umount will BUG if we don't release
 560                  * those before it's called so ->put_super is too late.
 561                  */
 562                 shrink_dcache_sb(s);
 563
 564                 dput(REISERFS_SB(s)->xattr_root);
 565                 REISERFS_SB(s)->xattr_root = NULL;
 566                 dput(REISERFS_SB(s)->priv_root);
 567                 REISERFS_SB(s)->priv_root = NULL;
 568         }
 569
 570         kill_block_super(s);
 571 }
 572
 573 #ifdef CONFIG_QUOTA
 574 static int reiserfs_quota_off(struct super_block *sb, int type);
 575
 576 static void reiserfs_quota_off_umount(struct super_block *s)
 577 {
 578         int type;
 579
 580         for (type = 0; type < REISERFS_MAXQUOTAS; type++)
 581                 reiserfs_quota_off(s, type);
 582 }
 583 #else
 584 static inline void reiserfs_quota_off_umount(struct super_block *s)
 585 {
 586 }
 587 #endif
 588
 589 static void reiserfs_put_super(struct super_block *s)
 590 {
 591         struct reiserfs_transaction_handle th;
 592         th.t_trans_id = 0;
 593
 594         reiserfs_quota_off_umount(s);
 595
 596         reiserfs_write_lock(s);
 597
 598         /*
 599          * change file system state to current state if it was mounted
 600          * with read-write permissions
 601          */
 602         if (!sb_rdonly(s)) {
 603                 if (!journal_begin(&th, s, 10)) {
 604                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 605                                                      1);
 606                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 607                                             REISERFS_SB(s)->s_mount_state);
 608                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 609                 }
 610         }
 611
 612         /*
 613          * note, journal_release checks for readonly mount, and can
 614          * decide not to do a journal_end
 615          */
 616         journal_release(&th, s);
 617
 618         reiserfs_free_bitmap_cache(s);
 619
 620         brelse(SB_BUFFER_WITH_SB(s));
 621
 622         print_statistics(s);
 623
 624         if (REISERFS_SB(s)->reserved_blocks != 0) {
 625                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 626                                  REISERFS_SB(s)->reserved_blocks);
 627         }
 628
 629         reiserfs_write_unlock(s);
 630         mutex_destroy(&REISERFS_SB(s)->lock);
 631         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 632         kfree(REISERFS_SB(s)->s_jdev);
 633         kfree(s->s_fs_info);
 634         s->s_fs_info = NULL;
 635 }
 636
 637 static struct kmem_cache *reiserfs_inode_cachep;
 638
 639 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 640 {
 641         struct reiserfs_inode_info *ei;
 642         ei = alloc_inode_sb(sb, reiserfs_inode_cachep, GFP_KERNEL);
 643         if (!ei)
 644                 return NULL;
 645         atomic_set(&ei->openers, 0);
 646         mutex_init(&ei->tailpack);
 647 #ifdef CONFIG_QUOTA
 648         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 649 #endif
 650
 651         return &ei->vfs_inode;
 652 }
 653
 654 static void reiserfs_free_inode(struct inode *inode)
 655 {
 656         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 657 }
 658
 659 static void init_once(void *foo)
 660 {
 661         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 662
 663         INIT_LIST_HEAD(&ei->i_prealloc_list);
 664         inode_init_once(&ei->vfs_inode);
 665 }
 666
 667 static int __init init_inodecache(void)
 668 {
 669         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 670                                                   sizeof(struct
 671                                                          reiserfs_inode_info),
 672                                                   0, (SLAB_RECLAIM_ACCOUNT|
 673                                                       SLAB_ACCOUNT),
 674                                                   init_once);
 675         if (reiserfs_inode_cachep == NULL)
 676                 return -ENOMEM;
 677         return 0;
 678 }
 679
 680 static void destroy_inodecache(void)
 681 {
 682         /*
 683          * Make sure all delayed rcu free inodes are flushed before we
 684          * destroy cache.
 685          */
 686         rcu_barrier();
 687         kmem_cache_destroy(reiserfs_inode_cachep);
 688 }
 689
 690 /* we don't mark inodes dirty, we just log them */
 691 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 692 {
 693         struct reiserfs_transaction_handle th;
 694
 695         int err = 0;
 696
 697         if (sb_rdonly(inode->i_sb)) {
 698                 reiserfs_warning(inode->i_sb, "clm-6006",
 699                                  "writing inode %lu on readonly FS",
 700                                  inode->i_ino);
 701                 return;
 702         }
 703         reiserfs_write_lock(inode->i_sb);
 704
 705         /*
 706          * this is really only used for atime updates, so they don't have
 707          * to be included in O_SYNC or fsync
 708          */
 709         err = journal_begin(&th, inode->i_sb, 1);
 710         if (err)
 711                 goto out;
 712
 713         reiserfs_update_sd(&th, inode);
 714         journal_end(&th);
 715
 716 out:
 717         reiserfs_write_unlock(inode->i_sb);
 718 }
 719
 720 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 721 {
 722         struct super_block *s = root->d_sb;
 723         struct reiserfs_journal *journal = SB_JOURNAL(s);
 724         long opts = REISERFS_SB(s)->s_mount_opt;
 725
 726         if (opts & (1 << REISERFS_LARGETAIL))
 727                 seq_puts(seq, ",tails=on");
 728         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 729                 seq_puts(seq, ",notail");
 730         /* tails=small is default so we don't show it */
 731
 732         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 733                 seq_puts(seq, ",barrier=none");
 734         /* barrier=flush is default so we don't show it */
 735
 736         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 737                 seq_puts(seq, ",errors=continue");
 738         else if (opts & (1 << REISERFS_ERROR_PANIC))
 739                 seq_puts(seq, ",errors=panic");
 740         /* errors=ro is default so we don't show it */
 741
 742         if (opts & (1 << REISERFS_DATA_LOG))
 743                 seq_puts(seq, ",data=journal");
 744         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 745                 seq_puts(seq, ",data=writeback");
 746         /* data=ordered is default so we don't show it */
 747
 748         if (opts & (1 << REISERFS_ATTRS))
 749                 seq_puts(seq, ",attrs");
 750
 751         if (opts & (1 << REISERFS_XATTRS_USER))
 752                 seq_puts(seq, ",user_xattr");
 753
 754         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 755                 seq_puts(seq, ",expose_privroot");
 756
 757         if (opts & (1 << REISERFS_POSIXACL))
 758                 seq_puts(seq, ",acl");
 759
 760         if (REISERFS_SB(s)->s_jdev)
 761                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 762
 763         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 764                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 765
 766 #ifdef CONFIG_QUOTA
 767         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 768                 seq_show_option(seq, "usrjquota",
 769                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 770         else if (opts & (1 << REISERFS_USRQUOTA))
 771                 seq_puts(seq, ",usrquota");
 772         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 773                 seq_show_option(seq, "grpjquota",
 774                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 775         else if (opts & (1 << REISERFS_GRPQUOTA))
 776                 seq_puts(seq, ",grpquota");
 777         if (REISERFS_SB(s)->s_jquota_fmt) {
 778                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 779                         seq_puts(seq, ",jqfmt=vfsold");
 780                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 781                         seq_puts(seq, ",jqfmt=vfsv0");
 782         }
 783 #endif
 784
 785         /* Block allocator options */
 786         if (opts & (1 << REISERFS_NO_BORDER))
 787                 seq_puts(seq, ",block-allocator=noborder");
 788         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 789                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 790         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 791                 seq_puts(seq, ",block-allocator=hashed_relocation");
 792         if (opts & (1 << REISERFS_TEST4))
 793                 seq_puts(seq, ",block-allocator=test4");
 794         show_alloc_options(seq, s);
 795         return 0;
 796 }
 797
 798 #ifdef CONFIG_QUOTA
 799 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 800                                     size_t, loff_t);
 801 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 802                                    loff_t);
 803
 804 static struct dquot __rcu **reiserfs_get_dquots(struct inode *inode)
 805 {
 806         return REISERFS_I(inode)->i_dquot;
 807 }
 808 #endif
 809
 810 static const struct super_operations reiserfs_sops = {
 811         .alloc_inode = reiserfs_alloc_inode,
 812         .free_inode = reiserfs_free_inode,
 813         .write_inode = reiserfs_write_inode,
 814         .dirty_inode = reiserfs_dirty_inode,
 815         .evict_inode = reiserfs_evict_inode,
 816         .put_super = reiserfs_put_super,
 817         .sync_fs = reiserfs_sync_fs,
 818         .freeze_fs = reiserfs_freeze,
 819         .unfreeze_fs = reiserfs_unfreeze,
 820         .statfs = reiserfs_statfs,
 821         .remount_fs = reiserfs_remount,
 822         .show_options = reiserfs_show_options,
 823 #ifdef CONFIG_QUOTA
 824         .quota_read = reiserfs_quota_read,
 825         .quota_write = reiserfs_quota_write,
 826         .get_dquots = reiserfs_get_dquots,
 827 #endif
 828 };
 829
 830 #ifdef CONFIG_QUOTA
 831 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 832
 833 static int reiserfs_write_dquot(struct dquot *);
 834 static int reiserfs_acquire_dquot(struct dquot *);
 835 static int reiserfs_release_dquot(struct dquot *);
 836 static int reiserfs_mark_dquot_dirty(struct dquot *);
 837 static int reiserfs_write_info(struct super_block *, int);
 838 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
 839
 840 static const struct dquot_operations reiserfs_quota_operations = {
 841         .write_dquot = reiserfs_write_dquot,
 842         .acquire_dquot = reiserfs_acquire_dquot,
 843         .release_dquot = reiserfs_release_dquot,
 844         .mark_dirty = reiserfs_mark_dquot_dirty,
 845         .write_info = reiserfs_write_info,
 846         .alloc_dquot    = dquot_alloc,
 847         .destroy_dquot  = dquot_destroy,
 848         .get_next_id    = dquot_get_next_id,
 849 };
 850
 851 static const struct quotactl_ops reiserfs_qctl_operations = {
 852         .quota_on = reiserfs_quota_on,
 853         .quota_off = reiserfs_quota_off,
 854         .quota_sync = dquot_quota_sync,
 855         .get_state = dquot_get_state,
 856         .set_info = dquot_set_dqinfo,
 857         .get_dqblk = dquot_get_dqblk,
 858         .set_dqblk = dquot_set_dqblk,
 859 };
 860 #endif
 861
 862 static const struct export_operations reiserfs_export_ops = {
 863         .encode_fh = reiserfs_encode_fh,
 864         .fh_to_dentry = reiserfs_fh_to_dentry,
 865         .fh_to_parent = reiserfs_fh_to_parent,
 866         .get_parent = reiserfs_get_parent,
 867 };
 868
 869 /*
 870  * this struct is used in reiserfs_getopt () for containing the value for
 871  * those mount options that have values rather than being toggles.
 872  */
 873 typedef struct {
 874         char *value;
 875         /*
 876          * bitmask which is to set on mount_options bitmask
 877          * when this value is found, 0 is no bits are to be changed.
 878          */
 879         int setmask;
 880         /*
 881          * bitmask which is to clear on mount_options bitmask
 882          * when this value is found, 0 is no bits are to be changed.
 883          * This is applied BEFORE setmask
 884          */
 885         int clrmask;
 886 } arg_desc_t;
 887
 888 /* Set this bit in arg_required to allow empty arguments */
 889 #define REISERFS_OPT_ALLOWEMPTY 31
 890
 891 /*
 892  * this struct is used in reiserfs_getopt() for describing the
 893  * set of reiserfs mount options
 894  */
 895 typedef struct {
 896         char *option_name;
 897
 898         /* 0 if argument is not required, not 0 otherwise */
 899         int arg_required;
 900
 901         /* list of values accepted by an option */
 902         const arg_desc_t *values;
 903
 904         /*
 905          * bitmask which is to set on mount_options bitmask
 906          * when this value is found, 0 is no bits are to be changed.
 907          */
 908         int setmask;
 909
 910         /*
 911          * bitmask which is to clear on mount_options bitmask
 912          * when this value is found, 0 is no bits are to be changed.
 913          * This is applied BEFORE setmask
 914          */
 915         int clrmask;
 916 } opt_desc_t;
 917
 918 /* possible values for -o data= */
 919 static const arg_desc_t logging_mode[] = {
 920         {"ordered", 1 << REISERFS_DATA_ORDERED,
 921          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 922         {"journal", 1 << REISERFS_DATA_LOG,
 923          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 924         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 925          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 926         {.value = NULL}
 927 };
 928
 929 /* possible values for -o barrier= */
 930 static const arg_desc_t barrier_mode[] = {
 931         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 932         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 933         {.value = NULL}
 934 };
 935
 936 /*
 937  * possible values for "-o block-allocator=" and bits which are to be set in
 938  * s_mount_opt of reiserfs specific part of in-core super block
 939  */
 940 static const arg_desc_t balloc[] = {
 941         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 942         {"border", 0, 1 << REISERFS_NO_BORDER},
 943         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 944         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 945         {"test4", 1 << REISERFS_TEST4, 0},
 946         {"notest4", 0, 1 << REISERFS_TEST4},
 947         {NULL, 0, 0}
 948 };
 949
 950 static const arg_desc_t tails[] = {
 951         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 952         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 953         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 954         {NULL, 0, 0}
 955 };
 956
 957 static const arg_desc_t error_actions[] = {
 958         {"panic", 1 << REISERFS_ERROR_PANIC,
 959          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 960         {"ro-remount", 1 << REISERFS_ERROR_RO,
 961          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 962 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 963         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 964          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 965 #endif
 966         {NULL, 0, 0},
 967 };
 968
 969 /*
 970  * proceed only one option from a list *cur - string containing of mount
 971  * options
 972  * opts - array of options which are accepted
 973  * opt_arg - if option is found and requires an argument and if it is specifed
 974  * in the input - pointer to the argument is stored here
 975  * bit_flags - if option requires to set a certain bit - it is set here
 976  * return -1 if unknown option is found, opt->arg_required otherwise
 977  */
 978 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 979                            char **opt_arg, unsigned long *bit_flags)
 980 {
 981         char *p;
 982         /*
 983          * foo=bar,
 984          * ^   ^  ^
 985          * |   |  +-- option_end
 986          * |   +-- arg_start
 987          * +-- option_start
 988          */
 989         const opt_desc_t *opt;
 990         const arg_desc_t *arg;
 991
 992         p = *cur;
 993
 994         /* assume argument cannot contain commas */
 995         *cur = strchr(p, ',');
 996         if (*cur) {
 997                 *(*cur) = '\0';
 998                 (*cur)++;
 999         }
1000
1001         if (!strncmp(p, "alloc=", 6)) {
1002                 /*
1003                  * Ugly special case, probably we should redo options
1004                  * parser so that it can understand several arguments for
1005                  * some options, also so that it can fill several bitfields
1006                  * with option values.
1007                  */
1008                 if (reiserfs_parse_alloc_options(s, p + 6)) {
1009                         return -1;
1010                 } else {
1011                         return 0;
1012                 }
1013         }
1014
1015         /* for every option in the list */
1016         for (opt = opts; opt->option_name; opt++) {
1017                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1018                         if (bit_flags) {
1019                                 if (opt->clrmask ==
1020                                     (1 << REISERFS_UNSUPPORTED_OPT))
1021                                         reiserfs_warning(s, "super-6500",
1022                                                          "%s not supported.\n",
1023                                                          p);
1024                                 else
1025                                         *bit_flags &= ~opt->clrmask;
1026                                 if (opt->setmask ==
1027                                     (1 << REISERFS_UNSUPPORTED_OPT))
1028                                         reiserfs_warning(s, "super-6501",
1029                                                          "%s not supported.\n",
1030                                                          p);
1031                                 else
1032                                         *bit_flags |= opt->setmask;
1033                         }
1034                         break;
1035                 }
1036         }
1037         if (!opt->option_name) {
1038                 reiserfs_warning(s, "super-6502",
1039                                  "unknown mount option \"%s\"", p);
1040                 return -1;
1041         }
1042
1043         p += strlen(opt->option_name);
1044         switch (*p) {
1045         case '=':
1046                 if (!opt->arg_required) {
1047                         reiserfs_warning(s, "super-6503",
1048                                          "the option \"%s\" does not "
1049                                          "require an argument\n",
1050                                          opt->option_name);
1051                         return -1;
1052                 }
1053                 break;
1054
1055         case 0:
1056                 if (opt->arg_required) {
1057                         reiserfs_warning(s, "super-6504",
1058                                          "the option \"%s\" requires an "
1059                                          "argument\n", opt->option_name);
1060                         return -1;
1061                 }
1062                 break;
1063         default:
1064                 reiserfs_warning(s, "super-6505",
1065                                  "head of option \"%s\" is only correct\n",
1066                                  opt->option_name);
1067                 return -1;
1068         }
1069
1070         /*
1071          * move to the argument, or to next option if argument is not
1072          * required
1073          */
1074         p++;
1075
1076         if (opt->arg_required
1077             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1078             && !strlen(p)) {
1079                 /* this catches "option=," if not allowed */
1080                 reiserfs_warning(s, "super-6506",
1081                                  "empty argument for \"%s\"\n",
1082                                  opt->option_name);
1083                 return -1;
1084         }
1085
1086         if (!opt->values) {
1087                 /* *=NULLopt_arg contains pointer to argument */
1088                 *opt_arg = p;
1089                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1090         }
1091
1092         /* values possible for this option are listed in opt->values */
1093         for (arg = opt->values; arg->value; arg++) {
1094                 if (!strcmp(p, arg->value)) {
1095                         if (bit_flags) {
1096                                 *bit_flags &= ~arg->clrmask;
1097                                 *bit_flags |= arg->setmask;
1098                         }
1099                         return opt->arg_required;
1100                 }
1101         }
1102
1103         reiserfs_warning(s, "super-6506",
1104                          "bad value \"%s\" for option \"%s\"\n", p,
1105                          opt->option_name);
1106         return -1;
1107 }
1108
1109 /* returns 0 if something is wrong in option string, 1 - otherwise */
1110 static int reiserfs_parse_options(struct super_block *s,
1111
1112                                   /* string given via mount's -o */
1113                                   char *options,
1114
1115                                   /*
1116                                    * after the parsing phase, contains the
1117                                    * collection of bitflags defining what
1118                                    * mount options were selected.
1119                                    */
1120                                   unsigned long *mount_options,
1121
1122                                   /* strtol-ed from NNN of resize=NNN */
1123                                   unsigned long *blocks,
1124                                   char **jdev_name,
1125                                   unsigned int *commit_max_age,
1126                                   char **qf_names,
1127                                   unsigned int *qfmt)
1128 {
1129         int c;
1130         char *arg = NULL;
1131         char *pos;
1132         opt_desc_t opts[] = {
1133                 /*
1134                  * Compatibility stuff, so that -o notail for old
1135                  * setups still work
1136                  */
1137                 {"tails",.arg_required = 't',.values = tails},
1138                 {"notail",.clrmask =
1139                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1140                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1141                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1142                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1143                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1144 #ifdef CONFIG_REISERFS_FS_XATTR
1145                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1146                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1147 #else
1148                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1149                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1150 #endif
1151 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1152                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1153                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1154 #else
1155                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1156                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1157 #endif
1158                 {.option_name = "nolog"},
1159                 {"replayonly",.setmask = 1 << REPLAYONLY},
1160                 {"block-allocator",.arg_required = 'a',.values = balloc},
1161                 {"data",.arg_required = 'd',.values = logging_mode},
1162                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1163                 {"resize",.arg_required = 'r',.values = NULL},
1164                 {"jdev",.arg_required = 'j',.values = NULL},
1165                 {"nolargeio",.arg_required = 'w',.values = NULL},
1166                 {"commit",.arg_required = 'c',.values = NULL},
1167                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1168                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1169                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1170                 {"errors",.arg_required = 'e',.values = error_actions},
1171                 {"usrjquota",.arg_required =
1172                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1173                 {"grpjquota",.arg_required =
1174                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1175                 {"jqfmt",.arg_required = 'f',.values = NULL},
1176                 {.option_name = NULL}
1177         };
1178
1179         *blocks = 0;
1180         if (!options || !*options)
1181                 /*
1182                  * use default configuration: create tails, journaling on, no
1183                  * conversion to newest format
1184                  */
1185                 return 1;
1186
1187         for (pos = options; pos;) {
1188                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1189                 if (c == -1)
1190                         /* wrong option is given */
1191                         return 0;
1192
1193                 if (c == 'r') {
1194                         char *p;
1195
1196                         p = NULL;
1197                         /* "resize=NNN" or "resize=auto" */
1198
1199                         if (!strcmp(arg, "auto")) {
1200                                 /* From JFS code, to auto-get the size. */
1201                                 *blocks = sb_bdev_nr_blocks(s);
1202                         } else {
1203                                 *blocks = simple_strtoul(arg, &p, 0);
1204                                 if (*p != '\0') {
1205                                         /* NNN does not look like a number */
1206                                         reiserfs_warning(s, "super-6507",
1207                                                          "bad value %s for "
1208                                                          "-oresize\n", arg);
1209                                         return 0;
1210                                 }
1211                         }
1212                 }
1213
1214                 if (c == 'c') {
1215                         char *p = NULL;
1216                         unsigned long val = simple_strtoul(arg, &p, 0);
1217                         /* commit=NNN (time in seconds) */
1218                         if (*p != '\0' || val >= (unsigned int)-1) {
1219                                 reiserfs_warning(s, "super-6508",
1220                                                  "bad value %s for -ocommit\n",
1221                                                  arg);
1222                                 return 0;
1223                         }
1224                         *commit_max_age = (unsigned int)val;
1225                 }
1226
1227                 if (c == 'w') {
1228                         reiserfs_warning(s, "super-6509", "nolargeio option "
1229                                          "is no longer supported");
1230                         return 0;
1231                 }
1232
1233                 if (c == 'j') {
1234                         if (arg && *arg && jdev_name) {
1235                                 /* Hm, already assigned? */
1236                                 if (*jdev_name) {
1237                                         reiserfs_warning(s, "super-6510",
1238                                                          "journal device was "
1239                                                          "already specified to "
1240                                                          "be %s", *jdev_name);
1241                                         return 0;
1242                                 }
1243                                 *jdev_name = arg;
1244                         }
1245                 }
1246 #ifdef CONFIG_QUOTA
1247                 if (c == 'u' || c == 'g') {
1248                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1249
1250                         if (sb_any_quota_loaded(s) &&
1251                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1252                                 reiserfs_warning(s, "super-6511",
1253                                                  "cannot change journaled "
1254                                                  "quota options when quota "
1255                                                  "turned on.");
1256                                 return 0;
1257                         }
1258                         if (qf_names[qtype] !=
1259                             REISERFS_SB(s)->s_qf_names[qtype])
1260                                 kfree(qf_names[qtype]);
1261                         qf_names[qtype] = NULL;
1262                         if (*arg) {     /* Some filename specified? */
1263                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1264                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1265                                               arg)) {
1266                                         reiserfs_warning(s, "super-6512",
1267                                                          "%s quota file "
1268                                                          "already specified.",
1269                                                          QTYPE2NAME(qtype));
1270                                         return 0;
1271                                 }
1272                                 if (strchr(arg, '/')) {
1273                                         reiserfs_warning(s, "super-6513",
1274                                                          "quotafile must be "
1275                                                          "on filesystem root.");
1276                                         return 0;
1277                                 }
1278                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1279                                 if (!qf_names[qtype]) {
1280                                         reiserfs_warning(s, "reiserfs-2502",
1281                                                          "not enough memory "
1282                                                          "for storing "
1283                                                          "quotafile name.");
1284                                         return 0;
1285                                 }
1286                                 if (qtype == USRQUOTA)
1287                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1288                                 else
1289                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1290                         } else {
1291                                 if (qtype == USRQUOTA)
1292                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1293                                 else
1294                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1295                         }
1296                 }
1297                 if (c == 'f') {
1298                         if (!strcmp(arg, "vfsold"))
1299                                 *qfmt = QFMT_VFS_OLD;
1300                         else if (!strcmp(arg, "vfsv0"))
1301                                 *qfmt = QFMT_VFS_V0;
1302                         else {
1303                                 reiserfs_warning(s, "super-6514",
1304                                                  "unknown quota format "
1305                                                  "specified.");
1306                                 return 0;
1307                         }
1308                         if (sb_any_quota_loaded(s) &&
1309                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1310                                 reiserfs_warning(s, "super-6515",
1311                                                  "cannot change journaled "
1312                                                  "quota options when quota "
1313                                                  "turned on.");
1314                                 return 0;
1315                         }
1316                 }
1317 #else
1318                 if (c == 'u' || c == 'g' || c == 'f') {
1319                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1320                                          "quota options not supported.");
1321                         return 0;
1322                 }
1323 #endif
1324         }
1325
1326 #ifdef CONFIG_QUOTA
1327         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1328             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1329                 reiserfs_warning(s, "super-6515",
1330                                  "journaled quota format not specified.");
1331                 return 0;
1332         }
1333         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1334                sb_has_quota_loaded(s, USRQUOTA)) ||
1335             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1336                sb_has_quota_loaded(s, GRPQUOTA))) {
1337                 reiserfs_warning(s, "super-6516", "quota options must "
1338                                  "be present when quota is turned on.");
1339                 return 0;
1340         }
1341 #endif
1342
1343         return 1;
1344 }
1345
1346 static void switch_data_mode(struct super_block *s, unsigned long mode)
1347 {
1348         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1349                                          (1 << REISERFS_DATA_ORDERED) |
1350                                          (1 << REISERFS_DATA_WRITEBACK));
1351         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1352 }
1353
1354 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1355 {
1356         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1357                 if (!reiserfs_data_log(s)) {
1358                         switch_data_mode(s, REISERFS_DATA_LOG);
1359                         reiserfs_info(s, "switching to journaled data mode\n");
1360                 }
1361         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1362                 if (!reiserfs_data_ordered(s)) {
1363                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1364                         reiserfs_info(s, "switching to ordered data mode\n");
1365                 }
1366         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1367                 if (!reiserfs_data_writeback(s)) {
1368                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1369                         reiserfs_info(s, "switching to writeback data mode\n");
1370                 }
1371         }
1372 }
1373
1374 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1375 {
1376         int flush = (1 << REISERFS_BARRIER_FLUSH);
1377         int none = (1 << REISERFS_BARRIER_NONE);
1378         int all_barrier = flush | none;
1379
1380         if (bits & all_barrier) {
1381                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1382                 if (bits & flush) {
1383                         REISERFS_SB(s)->s_mount_opt |= flush;
1384                         printk("reiserfs: enabling write barrier flush mode\n");
1385                 } else if (bits & none) {
1386                         REISERFS_SB(s)->s_mount_opt |= none;
1387                         printk("reiserfs: write barriers turned off\n");
1388                 }
1389         }
1390 }
1391
1392 static void handle_attrs(struct super_block *s)
1393 {
1394         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1395
1396         if (reiserfs_attrs(s)) {
1397                 if (old_format_only(s)) {
1398                         reiserfs_warning(s, "super-6517", "cannot support "
1399                                          "attributes on 3.5.x disk format");
1400                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1401                         return;
1402                 }
1403                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1404                         reiserfs_warning(s, "super-6518", "cannot support "
1405                                          "attributes until flag is set in "
1406                                          "super-block");
1407                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1408                 }
1409         }
1410 }
1411
1412 #ifdef CONFIG_QUOTA
1413 static void handle_quota_files(struct super_block *s, char **qf_names,
1414                                unsigned int *qfmt)
1415 {
1416         int i;
1417
1418         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1419                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1420                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1421                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1422         }
1423         if (*qfmt)
1424                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1425 }
1426 #endif
1427
1428 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1429 {
1430         struct reiserfs_super_block *rs;
1431         struct reiserfs_transaction_handle th;
1432         unsigned long blocks;
1433         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1434         unsigned long safe_mask = 0;
1435         unsigned int commit_max_age = (unsigned int)-1;
1436         struct reiserfs_journal *journal = SB_JOURNAL(s);
1437         int err;
1438         char *qf_names[REISERFS_MAXQUOTAS];
1439         unsigned int qfmt = 0;
1440 #ifdef CONFIG_QUOTA
1441         int i;
1442 #endif
1443
1444         sync_filesystem(s);
1445         reiserfs_write_lock(s);
1446
1447 #ifdef CONFIG_QUOTA
1448         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1449 #endif
1450
1451         rs = SB_DISK_SUPER_BLOCK(s);
1452
1453         if (!reiserfs_parse_options
1454             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1455             qf_names, &qfmt)) {
1456 #ifdef CONFIG_QUOTA
1457                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1458                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1459                                 kfree(qf_names[i]);
1460 #endif
1461                 err = -EINVAL;
1462                 goto out_err_unlock;
1463         }
1464 #ifdef CONFIG_QUOTA
1465         handle_quota_files(s, qf_names, &qfmt);
1466 #endif
1467
1468         handle_attrs(s);
1469
1470         /* Add options that are safe here */
1471         safe_mask |= 1 << REISERFS_SMALLTAIL;
1472         safe_mask |= 1 << REISERFS_LARGETAIL;
1473         safe_mask |= 1 << REISERFS_NO_BORDER;
1474         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1475         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1476         safe_mask |= 1 << REISERFS_TEST4;
1477         safe_mask |= 1 << REISERFS_ATTRS;
1478         safe_mask |= 1 << REISERFS_XATTRS_USER;
1479         safe_mask |= 1 << REISERFS_POSIXACL;
1480         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1481         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1482         safe_mask |= 1 << REISERFS_ERROR_RO;
1483         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1484         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1485         safe_mask |= 1 << REISERFS_USRQUOTA;
1486         safe_mask |= 1 << REISERFS_GRPQUOTA;
1487
1488         /*
1489          * Update the bitmask, taking care to keep
1490          * the bits we're not allowed to change here
1491          */
1492         REISERFS_SB(s)->s_mount_opt =
1493             (REISERFS_SB(s)->
1494              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1495
1496         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1497                 journal->j_max_commit_age = commit_max_age;
1498                 journal->j_max_trans_age = commit_max_age;
1499         } else if (commit_max_age == 0) {
1500                 /* 0 means restore defaults. */
1501                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1502                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1503         }
1504
1505         if (blocks) {
1506                 err = reiserfs_resize(s, blocks);
1507                 if (err != 0)
1508                         goto out_err_unlock;
1509         }
1510
1511         if (*mount_flags & SB_RDONLY) {
1512                 reiserfs_write_unlock(s);
1513                 reiserfs_xattr_init(s, *mount_flags);
1514                 /* remount read-only */
1515                 if (sb_rdonly(s))
1516                         /* it is read-only already */
1517                         goto out_ok_unlocked;
1518
1519                 err = dquot_suspend(s, -1);
1520                 if (err < 0)
1521                         goto out_err;
1522
1523                 /* try to remount file system with read-only permissions */
1524                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1525                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1526                         goto out_ok_unlocked;
1527                 }
1528
1529                 reiserfs_write_lock(s);
1530
1531                 err = journal_begin(&th, s, 10);
1532                 if (err)
1533                         goto out_err_unlock;
1534
1535                 /* Mounting a rw partition read-only. */
1536                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1537                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1538                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1539         } else {
1540                 /* remount read-write */
1541                 if (!sb_rdonly(s)) {
1542                         reiserfs_write_unlock(s);
1543                         reiserfs_xattr_init(s, *mount_flags);
1544                         goto out_ok_unlocked;   /* We are read-write already */
1545                 }
1546
1547                 if (reiserfs_is_journal_aborted(journal)) {
1548                         err = journal->j_errno;
1549                         goto out_err_unlock;
1550                 }
1551
1552                 handle_data_mode(s, mount_options);
1553                 handle_barrier_mode(s, mount_options);
1554                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1555
1556                 /* now it is safe to call journal_begin */
1557                 s->s_flags &= ~SB_RDONLY;
1558                 err = journal_begin(&th, s, 10);
1559                 if (err)
1560                         goto out_err_unlock;
1561
1562                 /* Mount a partition which is read-only, read-write */
1563                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1564                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1565                 s->s_flags &= ~SB_RDONLY;
1566                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1567                 if (!old_format_only(s))
1568                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1569                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1570                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1571                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1572         }
1573         /* this will force a full flush of all journal lists */
1574         SB_JOURNAL(s)->j_must_wait = 1;
1575         err = journal_end(&th);
1576         if (err)
1577                 goto out_err_unlock;
1578
1579         reiserfs_write_unlock(s);
1580         if (!(*mount_flags & SB_RDONLY)) {
1581                 dquot_resume(s, -1);
1582                 reiserfs_write_lock(s);
1583                 finish_unfinished(s);
1584                 reiserfs_write_unlock(s);
1585                 reiserfs_xattr_init(s, *mount_flags);
1586         }
1587
1588 out_ok_unlocked:
1589         return 0;
1590
1591 out_err_unlock:
1592         reiserfs_write_unlock(s);
1593 out_err:
1594         return err;
1595 }
1596
1597 static int read_super_block(struct super_block *s, int offset)
1598 {
1599         struct buffer_head *bh;
1600         struct reiserfs_super_block *rs;
1601         int fs_blocksize;
1602
1603         bh = sb_bread(s, offset / s->s_blocksize);
1604         if (!bh) {
1605                 reiserfs_warning(s, "sh-2006",
1606                                  "bread failed (dev %s, block %lu, size %lu)",
1607                                  s->s_id, offset / s->s_blocksize,
1608                                  s->s_blocksize);
1609                 return 1;
1610         }
1611
1612         rs = (struct reiserfs_super_block *)bh->b_data;
1613         if (!is_any_reiserfs_magic_string(rs)) {
1614                 brelse(bh);
1615                 return 1;
1616         }
1617         /*
1618          * ok, reiserfs signature (old or new) found in at the given offset
1619          */
1620         fs_blocksize = sb_blocksize(rs);
1621         brelse(bh);
1622         sb_set_blocksize(s, fs_blocksize);
1623
1624         bh = sb_bread(s, offset / s->s_blocksize);
1625         if (!bh) {
1626                 reiserfs_warning(s, "sh-2007",
1627                                  "bread failed (dev %s, block %lu, size %lu)",
1628                                  s->s_id, offset / s->s_blocksize,
1629                                  s->s_blocksize);
1630                 return 1;
1631         }
1632
1633         rs = (struct reiserfs_super_block *)bh->b_data;
1634         if (sb_blocksize(rs) != s->s_blocksize) {
1635                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1636                                  "filesystem on (dev %s, block %llu, size %lu)",
1637                                  s->s_id,
1638                                  (unsigned long long)bh->b_blocknr,
1639                                  s->s_blocksize);
1640                 brelse(bh);
1641                 return 1;
1642         }
1643
1644         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1645                 brelse(bh);
1646                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1647                                  "--rebuild-tree run detected. Please run\n"
1648                                  "reiserfsck --rebuild-tree and wait for a "
1649                                  "completion. If that fails\n"
1650                                  "get newer reiserfsprogs package");
1651                 return 1;
1652         }
1653
1654         reiserfs_warning(NULL, "", "reiserfs filesystem is deprecated and "
1655                 "scheduled to be removed from the kernel in 2025");
1656         SB_BUFFER_WITH_SB(s) = bh;
1657         SB_DISK_SUPER_BLOCK(s) = rs;
1658
1659         /*
1660          * magic is of non-standard journal filesystem, look at s_version to
1661          * find which format is in use
1662          */
1663         if (is_reiserfs_jr(rs)) {
1664                 if (sb_version(rs) == REISERFS_VERSION_2)
1665                         reiserfs_info(s, "found reiserfs format \"3.6\""
1666                                       " with non-standard journal\n");
1667                 else if (sb_version(rs) == REISERFS_VERSION_1)
1668                         reiserfs_info(s, "found reiserfs format \"3.5\""
1669                                       " with non-standard journal\n");
1670                 else {
1671                         reiserfs_warning(s, "sh-2012", "found unknown "
1672                                          "format \"%u\" of reiserfs with "
1673                                          "non-standard magic", sb_version(rs));
1674                         return 1;
1675                 }
1676         } else
1677                 /*
1678                  * s_version of standard format may contain incorrect
1679                  * information, so we just look at the magic string
1680                  */
1681                 reiserfs_info(s,
1682                               "found reiserfs format \"%s\" with standard journal\n",
1683                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1684
1685         s->s_op = &reiserfs_sops;
1686         s->s_export_op = &reiserfs_export_ops;
1687 #ifdef CONFIG_QUOTA
1688         s->s_qcop = &reiserfs_qctl_operations;
1689         s->dq_op = &reiserfs_quota_operations;
1690         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1691 #endif
1692
1693         /*
1694          * new format is limited by the 32 bit wide i_blocks field, want to
1695          * be one full block below that.
1696          */
1697         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1698         return 0;
1699 }
1700
1701 /* after journal replay, reread all bitmap and super blocks */
1702 static int reread_meta_blocks(struct super_block *s)
1703 {
1704         if (bh_read(SB_BUFFER_WITH_SB(s), 0) < 0) {
1705                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1706                 return 1;
1707         }
1708
1709         return 0;
1710 }
1711
1712 /* hash detection stuff */
1713
1714 /*
1715  * if root directory is empty - we set default - Yura's - hash and
1716  * warn about it
1717  * FIXME: we look for only one name in a directory. If tea and yura
1718  * both have the same value - we ask user to send report to the
1719  * mailing list
1720  */
1721 static __u32 find_hash_out(struct super_block *s)
1722 {
1723         int retval;
1724         struct inode *inode;
1725         struct cpu_key key;
1726         INITIALIZE_PATH(path);
1727         struct reiserfs_dir_entry de;
1728         struct reiserfs_de_head *deh;
1729         __u32 hash = DEFAULT_HASH;
1730         __u32 deh_hashval, teahash, r5hash, yurahash;
1731
1732         inode = d_inode(s->s_root);
1733
1734         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1735         retval = search_by_entry_key(s, &key, &path, &de);
1736         if (retval == IO_ERROR) {
1737                 pathrelse(&path);
1738                 return UNSET_HASH;
1739         }
1740         if (retval == NAME_NOT_FOUND)
1741                 de.de_entry_num--;
1742
1743         set_de_name_and_namelen(&de);
1744         deh = de.de_deh + de.de_entry_num;
1745
1746         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1747                 /* allow override in this case */
1748                 if (reiserfs_rupasov_hash(s))
1749                         hash = YURA_HASH;
1750                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1751                 goto out;
1752         }
1753
1754         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1755         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1756         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1757         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1758
1759         if ((teahash == r5hash && deh_hashval == r5hash) ||
1760             (teahash == yurahash && deh_hashval == yurahash) ||
1761             (r5hash == yurahash && deh_hashval == yurahash)) {
1762                 reiserfs_warning(s, "reiserfs-2506",
1763                                  "Unable to automatically detect hash "
1764                                  "function. Please mount with -o "
1765                                  "hash={tea,rupasov,r5}");
1766                 hash = UNSET_HASH;
1767                 goto out;
1768         }
1769
1770         if (deh_hashval == yurahash)
1771                 hash = YURA_HASH;
1772         else if (deh_hashval == teahash)
1773                 hash = TEA_HASH;
1774         else if (deh_hashval == r5hash)
1775                 hash = R5_HASH;
1776         else {
1777                 reiserfs_warning(s, "reiserfs-2506",
1778                                  "Unrecognised hash function");
1779                 hash = UNSET_HASH;
1780         }
1781 out:
1782         pathrelse(&path);
1783         return hash;
1784 }
1785
1786 /* finds out which hash names are sorted with */
1787 static int what_hash(struct super_block *s)
1788 {
1789         __u32 code;
1790
1791         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1792
1793         /*
1794          * reiserfs_hash_detect() == true if any of the hash mount options
1795          * were used.  We must check them to make sure the user isn't
1796          * using a bad hash value
1797          */
1798         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1799                 code = find_hash_out(s);
1800
1801         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1802                 /*
1803                  * detection has found the hash, and we must check against the
1804                  * mount options
1805                  */
1806                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1807                         reiserfs_warning(s, "reiserfs-2507",
1808                                          "Error, %s hash detected, "
1809                                          "unable to force rupasov hash",
1810                                          reiserfs_hashname(code));
1811                         code = UNSET_HASH;
1812                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1813                         reiserfs_warning(s, "reiserfs-2508",
1814                                          "Error, %s hash detected, "
1815                                          "unable to force tea hash",
1816                                          reiserfs_hashname(code));
1817                         code = UNSET_HASH;
1818                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1819                         reiserfs_warning(s, "reiserfs-2509",
1820                                          "Error, %s hash detected, "
1821                                          "unable to force r5 hash",
1822                                          reiserfs_hashname(code));
1823                         code = UNSET_HASH;
1824                 }
1825         } else {
1826                 /*
1827                  * find_hash_out was not called or
1828                  * could not determine the hash
1829                  */
1830                 if (reiserfs_rupasov_hash(s)) {
1831                         code = YURA_HASH;
1832                 } else if (reiserfs_tea_hash(s)) {
1833                         code = TEA_HASH;
1834                 } else if (reiserfs_r5_hash(s)) {
1835                         code = R5_HASH;
1836                 }
1837         }
1838
1839         /*
1840          * if we are mounted RW, and we have a new valid hash code, update
1841          * the super
1842          */
1843         if (code != UNSET_HASH &&
1844             !sb_rdonly(s) &&
1845             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1846                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1847         }
1848         return code;
1849 }
1850
1851 /* return pointer to appropriate function */
1852 static hashf_t hash_function(struct super_block *s)
1853 {
1854         switch (what_hash(s)) {
1855         case TEA_HASH:
1856                 reiserfs_info(s, "Using tea hash to sort names\n");
1857                 return keyed_hash;
1858         case YURA_HASH:
1859                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1860                 return yura_hash;
1861         case R5_HASH:
1862                 reiserfs_info(s, "Using r5 hash to sort names\n");
1863                 return r5_hash;
1864         }
1865         return NULL;
1866 }
1867
1868 /* this is used to set up correct value for old partitions */
1869 static int function2code(hashf_t func)
1870 {
1871         if (func == keyed_hash)
1872                 return TEA_HASH;
1873         if (func == yura_hash)
1874                 return YURA_HASH;
1875         if (func == r5_hash)
1876                 return R5_HASH;
1877
1878         BUG();                  /* should never happen */
1879
1880         return 0;
1881 }
1882
1883 #define SWARN(silent, s, id, ...)                       \
1884         if (!(silent))                          \
1885                 reiserfs_warning(s, id, __VA_ARGS__)
1886
1887 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1888 {
1889         struct inode *root_inode;
1890         struct reiserfs_transaction_handle th;
1891         int old_format = 0;
1892         unsigned long blocks;
1893         unsigned int commit_max_age = 0;
1894         int jinit_done = 0;
1895         struct reiserfs_iget_args args;
1896         struct reiserfs_super_block *rs;
1897         char *jdev_name;
1898         struct reiserfs_sb_info *sbi;
1899         int errval = -EINVAL;
1900         char *qf_names[REISERFS_MAXQUOTAS] = {};
1901         unsigned int qfmt = 0;
1902
1903         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1904         if (!sbi)
1905                 return -ENOMEM;
1906         s->s_fs_info = sbi;
1907         /* Set default values for options: non-aggressive tails, RO on errors */
1908         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1909         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1910         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1911         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1912         sbi->s_alloc_options.preallocmin = 0;
1913         /* Preallocate by 16 blocks (17-1) at once */
1914         sbi->s_alloc_options.preallocsize = 17;
1915         /* setup default block allocator options */
1916         reiserfs_init_alloc_options(s);
1917
1918         spin_lock_init(&sbi->old_work_lock);
1919         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1920         mutex_init(&sbi->lock);
1921         sbi->lock_depth = -1;
1922
1923         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1924                                          s->s_id);
1925         if (!sbi->commit_wq) {
1926                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1927                 errval = -ENOMEM;
1928                 goto error_unlocked;
1929         }
1930
1931         jdev_name = NULL;
1932         if (reiserfs_parse_options
1933             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1934              &commit_max_age, qf_names, &qfmt) == 0) {
1935                 goto error_unlocked;
1936         }
1937         if (jdev_name && jdev_name[0]) {
1938                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1939                 if (!sbi->s_jdev) {
1940                         SWARN(silent, s, "", "Cannot allocate memory for "
1941                                 "journal device name");
1942                         goto error_unlocked;
1943                 }
1944         }
1945 #ifdef CONFIG_QUOTA
1946         handle_quota_files(s, qf_names, &qfmt);
1947 #endif
1948
1949         if (blocks) {
1950                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1951                 goto error_unlocked;
1952         }
1953
1954         /*
1955          * try old format (undistributed bitmap, super block in 8-th 1k
1956          * block of a device)
1957          */
1958         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1959                 old_format = 1;
1960
1961         /*
1962          * try new format (64-th 1k block), which can contain reiserfs
1963          * super block
1964          */
1965         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1966                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1967                       s->s_id);
1968                 goto error_unlocked;
1969         }
1970
1971         s->s_time_min = 0;
1972         s->s_time_max = U32_MAX;
1973
1974         rs = SB_DISK_SUPER_BLOCK(s);
1975         /*
1976          * Let's do basic sanity check to verify that underlying device is not
1977          * smaller than the filesystem. If the check fails then abort and
1978          * scream, because bad stuff will happen otherwise.
1979          */
1980         if (bdev_nr_bytes(s->s_bdev) < sb_block_count(rs) * sb_blocksize(rs)) {
1981                 SWARN(silent, s, "", "Filesystem cannot be "
1982                       "mounted because it is bigger than the device");
1983                 SWARN(silent, s, "", "You may need to run fsck "
1984                       "or increase size of your LVM partition");
1985                 SWARN(silent, s, "", "Or may be you forgot to "
1986                       "reboot after fdisk when it told you to");
1987                 goto error_unlocked;
1988         }
1989
1990         sbi->s_mount_state = SB_REISERFS_STATE(s);
1991         sbi->s_mount_state = REISERFS_VALID_FS;
1992
1993         if ((errval = reiserfs_init_bitmap_cache(s))) {
1994                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1995                 goto error_unlocked;
1996         }
1997
1998         errval = -EINVAL;
1999 #ifdef CONFIG_REISERFS_CHECK
2000         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2001         SWARN(silent, s, "", "- it is slow mode for debugging.");
2002 #endif
2003
2004         /* make data=ordered the default */
2005         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2006             !reiserfs_data_writeback(s)) {
2007                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2008         }
2009
2010         if (reiserfs_data_log(s)) {
2011                 reiserfs_info(s, "using journaled data mode\n");
2012         } else if (reiserfs_data_ordered(s)) {
2013                 reiserfs_info(s, "using ordered data mode\n");
2014         } else {
2015                 reiserfs_info(s, "using writeback data mode\n");
2016         }
2017         if (reiserfs_barrier_flush(s)) {
2018                 printk("reiserfs: using flush barriers\n");
2019         }
2020
2021         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2022                 SWARN(silent, s, "sh-2022",
2023                       "unable to initialize journal space");
2024                 goto error_unlocked;
2025         } else {
2026                 /*
2027                  * once this is set, journal_release must be called
2028                  * if we error out of the mount
2029                  */
2030                 jinit_done = 1;
2031         }
2032
2033         if (reread_meta_blocks(s)) {
2034                 SWARN(silent, s, "jmacd-9",
2035                       "unable to reread meta blocks after journal init");
2036                 goto error_unlocked;
2037         }
2038
2039         if (replay_only(s))
2040                 goto error_unlocked;
2041
2042         s->s_xattr = reiserfs_xattr_handlers;
2043
2044         if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2045                 SWARN(silent, s, "clm-7000",
2046                       "Detected readonly device, marking FS readonly");
2047                 s->s_flags |= SB_RDONLY;
2048         }
2049         args.objectid = REISERFS_ROOT_OBJECTID;
2050         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2051         root_inode =
2052             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2053                          reiserfs_init_locked_inode, (void *)&args);
2054         if (!root_inode) {
2055                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2056                 goto error_unlocked;
2057         }
2058
2059         /*
2060          * This path assumed to be called with the BKL in the old times.
2061          * Now we have inherited the big reiserfs lock from it and many
2062          * reiserfs helpers called in the mount path and elsewhere require
2063          * this lock to be held even if it's not always necessary. Let's be
2064          * conservative and hold it early. The window can be reduced after
2065          * careful review of the code.
2066          */
2067         reiserfs_write_lock(s);
2068
2069         if (root_inode->i_state & I_NEW) {
2070                 reiserfs_read_locked_inode(root_inode, &args);
2071                 unlock_new_inode(root_inode);
2072         }
2073
2074         if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
2075             !root_inode->i_size) {
2076                 SWARN(silent, s, "", "corrupt root inode, run fsck");
2077                 iput(root_inode);
2078                 errval = -EUCLEAN;
2079                 goto error;
2080         }
2081
2082         s->s_root = d_make_root(root_inode);
2083         if (!s->s_root)
2084                 goto error;
2085         /* define and initialize hash function */
2086         sbi->s_hash_function = hash_function(s);
2087         if (sbi->s_hash_function == NULL) {
2088                 dput(s->s_root);
2089                 s->s_root = NULL;
2090                 goto error;
2091         }
2092
2093         if (is_reiserfs_3_5(rs)
2094             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2095                 set_bit(REISERFS_3_5, &sbi->s_properties);
2096         else if (old_format)
2097                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2098         else
2099                 set_bit(REISERFS_3_6, &sbi->s_properties);
2100
2101         if (!sb_rdonly(s)) {
2102
2103                 errval = journal_begin(&th, s, 1);
2104                 if (errval) {
2105                         dput(s->s_root);
2106                         s->s_root = NULL;
2107                         goto error;
2108                 }
2109                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2110
2111                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2112                 set_sb_fs_state(rs, 0);
2113
2114                 /*
2115                  * Clear out s_bmap_nr if it would wrap. We can handle this
2116                  * case, but older revisions can't. This will cause the
2117                  * file system to fail mount on those older implementations,
2118                  * avoiding corruption. -jeffm
2119                  */
2120                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2121                     sb_bmap_nr(rs) != 0) {
2122                         reiserfs_warning(s, "super-2030", "This file system "
2123                                         "claims to use %u bitmap blocks in "
2124                                         "its super block, but requires %u. "
2125                                         "Clearing to zero.", sb_bmap_nr(rs),
2126                                         reiserfs_bmap_count(s));
2127
2128                         set_sb_bmap_nr(rs, 0);
2129                 }
2130
2131                 if (old_format_only(s)) {
2132                         /*
2133                          * filesystem of format 3.5 either with standard
2134                          * or non-standard journal
2135                          */
2136                         if (convert_reiserfs(s)) {
2137                                 /* and -o conv is given */
2138                                 if (!silent)
2139                                         reiserfs_info(s,
2140                                                       "converting 3.5 filesystem to the 3.6 format");
2141
2142                                 if (is_reiserfs_3_5(rs))
2143                                         /*
2144                                          * put magic string of 3.6 format.
2145                                          * 2.2 will not be able to
2146                                          * mount this filesystem anymore
2147                                          */
2148                                         memcpy(rs->s_v1.s_magic,
2149                                                reiserfs_3_6_magic_string,
2150                                                sizeof
2151                                                (reiserfs_3_6_magic_string));
2152
2153                                 set_sb_version(rs, REISERFS_VERSION_2);
2154                                 reiserfs_convert_objectid_map_v1(s);
2155                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2156                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2157                         } else if (!silent) {
2158                                 reiserfs_info(s, "using 3.5.x disk format\n");
2159                         }
2160                 } else
2161                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2162
2163
2164                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2165                 errval = journal_end(&th);
2166                 if (errval) {
2167                         dput(s->s_root);
2168                         s->s_root = NULL;
2169                         goto error;
2170                 }
2171
2172                 reiserfs_write_unlock(s);
2173                 if ((errval = reiserfs_lookup_privroot(s)) ||
2174                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2175                         dput(s->s_root);
2176                         s->s_root = NULL;
2177                         goto error_unlocked;
2178                 }
2179                 reiserfs_write_lock(s);
2180
2181                 /*
2182                  * look for files which were to be removed in previous session
2183                  */
2184                 finish_unfinished(s);
2185         } else {
2186                 if (old_format_only(s) && !silent) {
2187                         reiserfs_info(s, "using 3.5.x disk format\n");
2188                 }
2189
2190                 reiserfs_write_unlock(s);
2191                 if ((errval = reiserfs_lookup_privroot(s)) ||
2192                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2193                         dput(s->s_root);
2194                         s->s_root = NULL;
2195                         goto error_unlocked;
2196                 }
2197                 reiserfs_write_lock(s);
2198         }
2199         /*
2200          * mark hash in super block: it could be unset. overwrite should be ok
2201          */
2202         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2203
2204         handle_attrs(s);
2205
2206         reiserfs_proc_info_init(s);
2207
2208         init_waitqueue_head(&(sbi->s_wait));
2209         spin_lock_init(&sbi->bitmap_lock);
2210
2211         reiserfs_write_unlock(s);
2212
2213         return (0);
2214
2215 error:
2216         reiserfs_write_unlock(s);
2217
2218 error_unlocked:
2219         /* kill the commit thread, free journal ram */
2220         if (jinit_done) {
2221                 reiserfs_write_lock(s);
2222                 journal_release_error(NULL, s);
2223                 reiserfs_write_unlock(s);
2224         }
2225
2226         if (sbi->commit_wq)
2227                 destroy_workqueue(sbi->commit_wq);
2228
2229         reiserfs_cancel_old_flush(s);
2230
2231         reiserfs_free_bitmap_cache(s);
2232         if (SB_BUFFER_WITH_SB(s))
2233                 brelse(SB_BUFFER_WITH_SB(s));
2234 #ifdef CONFIG_QUOTA
2235         {
2236                 int j;
2237                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2238                         kfree(qf_names[j]);
2239         }
2240 #endif
2241         kfree(sbi->s_jdev);
2242         kfree(sbi);
2243
2244         s->s_fs_info = NULL;
2245         return errval;
2246 }
2247
2248 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2249 {
2250         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2251
2252         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2253         buf->f_bfree = sb_free_blocks(rs);
2254         buf->f_bavail = buf->f_bfree;
2255         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2256         buf->f_bsize = dentry->d_sb->s_blocksize;
2257         /* changed to accommodate gcc folks. */
2258         buf->f_type = REISERFS_SUPER_MAGIC;
2259         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2260         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2261                                 sizeof(rs->s_uuid)/2);
2262
2263         return 0;
2264 }
2265
2266 #ifdef CONFIG_QUOTA
2267 static int reiserfs_write_dquot(struct dquot *dquot)
2268 {
2269         struct reiserfs_transaction_handle th;
2270         int ret, err;
2271         int depth;
2272
2273         reiserfs_write_lock(dquot->dq_sb);
2274         ret =
2275             journal_begin(&th, dquot->dq_sb,
2276                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2277         if (ret)
2278                 goto out;
2279         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2280         ret = dquot_commit(dquot);
2281         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2282         err = journal_end(&th);
2283         if (!ret && err)
2284                 ret = err;
2285 out:
2286         reiserfs_write_unlock(dquot->dq_sb);
2287         return ret;
2288 }
2289
2290 static int reiserfs_acquire_dquot(struct dquot *dquot)
2291 {
2292         struct reiserfs_transaction_handle th;
2293         int ret, err;
2294         int depth;
2295
2296         reiserfs_write_lock(dquot->dq_sb);
2297         ret =
2298             journal_begin(&th, dquot->dq_sb,
2299                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2300         if (ret)
2301                 goto out;
2302         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2303         ret = dquot_acquire(dquot);
2304         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2305         err = journal_end(&th);
2306         if (!ret && err)
2307                 ret = err;
2308 out:
2309         reiserfs_write_unlock(dquot->dq_sb);
2310         return ret;
2311 }
2312
2313 static int reiserfs_release_dquot(struct dquot *dquot)
2314 {
2315         struct reiserfs_transaction_handle th;
2316         int ret, err;
2317
2318         reiserfs_write_lock(dquot->dq_sb);
2319         ret =
2320             journal_begin(&th, dquot->dq_sb,
2321                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2322         reiserfs_write_unlock(dquot->dq_sb);
2323         if (ret) {
2324                 /* Release dquot anyway to avoid endless cycle in dqput() */
2325                 dquot_release(dquot);
2326                 goto out;
2327         }
2328         ret = dquot_release(dquot);
2329         reiserfs_write_lock(dquot->dq_sb);
2330         err = journal_end(&th);
2331         if (!ret && err)
2332                 ret = err;
2333         reiserfs_write_unlock(dquot->dq_sb);
2334 out:
2335         return ret;
2336 }
2337
2338 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2339 {
2340         /* Are we journaling quotas? */
2341         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2342             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2343                 dquot_mark_dquot_dirty(dquot);
2344                 return reiserfs_write_dquot(dquot);
2345         } else
2346                 return dquot_mark_dquot_dirty(dquot);
2347 }
2348
2349 static int reiserfs_write_info(struct super_block *sb, int type)
2350 {
2351         struct reiserfs_transaction_handle th;
2352         int ret, err;
2353         int depth;
2354
2355         /* Data block + inode block */
2356         reiserfs_write_lock(sb);
2357         ret = journal_begin(&th, sb, 2);
2358         if (ret)
2359                 goto out;
2360         depth = reiserfs_write_unlock_nested(sb);
2361         ret = dquot_commit_info(sb, type);
2362         reiserfs_write_lock_nested(sb, depth);
2363         err = journal_end(&th);
2364         if (!ret && err)
2365                 ret = err;
2366 out:
2367         reiserfs_write_unlock(sb);
2368         return ret;
2369 }
2370
2371 /*
2372  * Turn on quotas during mount time - we need to find the quota file and such...
2373  */
2374 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2375 {
2376         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2377                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2378 }
2379
2380 /*
2381  * Standard function to be called on quota_on
2382  */
2383 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2384                              const struct path *path)
2385 {
2386         int err;
2387         struct inode *inode;
2388         struct reiserfs_transaction_handle th;
2389         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2390
2391         reiserfs_write_lock(sb);
2392         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2393                 err = -EINVAL;
2394                 goto out;
2395         }
2396
2397         /* Quotafile not on the same filesystem? */
2398         if (path->dentry->d_sb != sb) {
2399                 err = -EXDEV;
2400                 goto out;
2401         }
2402         inode = d_inode(path->dentry);
2403         /*
2404          * We must not pack tails for quota files on reiserfs for quota
2405          * IO to work
2406          */
2407         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2408                 err = reiserfs_unpack(inode);
2409                 if (err) {
2410                         reiserfs_warning(sb, "super-6520",
2411                                 "Unpacking tail of quota file failed"
2412                                 " (%d). Cannot turn on quotas.", err);
2413                         err = -EINVAL;
2414                         goto out;
2415                 }
2416                 mark_inode_dirty(inode);
2417         }
2418         /* Journaling quota? */
2419         if (REISERFS_SB(sb)->s_qf_names[type]) {
2420                 /* Quotafile not of fs root? */
2421                 if (path->dentry->d_parent != sb->s_root)
2422                         reiserfs_warning(sb, "super-6521",
2423                                  "Quota file not on filesystem root. "
2424                                  "Journalled quota will not work.");
2425         }
2426
2427         /*
2428          * When we journal data on quota file, we have to flush journal to see
2429          * all updates to the file when we bypass pagecache...
2430          */
2431         if (reiserfs_file_data_log(inode)) {
2432                 /* Just start temporary transaction and finish it */
2433                 err = journal_begin(&th, sb, 1);
2434                 if (err)
2435                         goto out;
2436                 err = journal_end_sync(&th);
2437                 if (err)
2438                         goto out;
2439         }
2440         reiserfs_write_unlock(sb);
2441         err = dquot_quota_on(sb, type, format_id, path);
2442         if (!err) {
2443                 inode_lock(inode);
2444                 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2445                                               REISERFS_NOATIME_FL;
2446                 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2447                                 S_IMMUTABLE | S_NOATIME);
2448                 inode_unlock(inode);
2449                 mark_inode_dirty(inode);
2450         }
2451         return err;
2452 out:
2453         reiserfs_write_unlock(sb);
2454         return err;
2455 }
2456
2457 static int reiserfs_quota_off(struct super_block *sb, int type)
2458 {
2459         int err;
2460         struct inode *inode = sb_dqopt(sb)->files[type];
2461
2462         if (!inode || !igrab(inode))
2463                 goto out;
2464
2465         err = dquot_quota_off(sb, type);
2466         if (err)
2467                 goto out_put;
2468
2469         inode_lock(inode);
2470         REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2471                                         REISERFS_NOATIME_FL);
2472         inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2473         inode_unlock(inode);
2474         mark_inode_dirty(inode);
2475 out_put:
2476         iput(inode);
2477         return err;
2478 out:
2479         return dquot_quota_off(sb, type);
2480 }
2481
2482 /*
2483  * Read data from quotafile - avoid pagecache and such because we cannot afford
2484  * acquiring the locks... As quota files are never truncated and quota code
2485  * itself serializes the operations (and no one else should touch the files)
2486  * we don't have to be afraid of races
2487  */
2488 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2489                                    size_t len, loff_t off)
2490 {
2491         struct inode *inode = sb_dqopt(sb)->files[type];
2492         unsigned long blk = off >> sb->s_blocksize_bits;
2493         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2494         size_t toread;
2495         struct buffer_head tmp_bh, *bh;
2496         loff_t i_size = i_size_read(inode);
2497
2498         if (off > i_size)
2499                 return 0;
2500         if (off + len > i_size)
2501                 len = i_size - off;
2502         toread = len;
2503         while (toread > 0) {
2504                 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
2505                 tmp_bh.b_state = 0;
2506                 /*
2507                  * Quota files are without tails so we can safely
2508                  * use this function
2509                  */
2510                 reiserfs_write_lock(sb);
2511                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2512                 reiserfs_write_unlock(sb);
2513                 if (err)
2514                         return err;
2515                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2516                         memset(data, 0, tocopy);
2517                 else {
2518                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2519                         if (!bh)
2520                                 return -EIO;
2521                         memcpy(data, bh->b_data + offset, tocopy);
2522                         brelse(bh);
2523                 }
2524                 offset = 0;
2525                 toread -= tocopy;
2526                 data += tocopy;
2527                 blk++;
2528         }
2529         return len;
2530 }
2531
2532 /*
2533  * Write to quotafile (we know the transaction is already started and has
2534  * enough credits)
2535  */
2536 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2537                                     const char *data, size_t len, loff_t off)
2538 {
2539         struct inode *inode = sb_dqopt(sb)->files[type];
2540         unsigned long blk = off >> sb->s_blocksize_bits;
2541         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2542         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2543         size_t towrite = len;
2544         struct buffer_head tmp_bh, *bh;
2545
2546         if (!current->journal_info) {
2547                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2548                         (unsigned long long)off, (unsigned long long)len);
2549                 return -EIO;
2550         }
2551         while (towrite > 0) {
2552                 tocopy = min_t(unsigned long, sb->s_blocksize - offset, towrite);
2553                 tmp_bh.b_state = 0;
2554                 reiserfs_write_lock(sb);
2555                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2556                 reiserfs_write_unlock(sb);
2557                 if (err)
2558                         goto out;
2559                 if (offset || tocopy != sb->s_blocksize)
2560                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2561                 else
2562                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2563                 if (!bh) {
2564                         err = -EIO;
2565                         goto out;
2566                 }
2567                 lock_buffer(bh);
2568                 memcpy(bh->b_data + offset, data, tocopy);
2569                 flush_dcache_page(bh->b_page);
2570                 set_buffer_uptodate(bh);
2571                 unlock_buffer(bh);
2572                 reiserfs_write_lock(sb);
2573                 reiserfs_prepare_for_journal(sb, bh, 1);
2574                 journal_mark_dirty(current->journal_info, bh);
2575                 if (!journal_quota)
2576                         reiserfs_add_ordered_list(inode, bh);
2577                 reiserfs_write_unlock(sb);
2578                 brelse(bh);
2579                 offset = 0;
2580                 towrite -= tocopy;
2581                 data += tocopy;
2582                 blk++;
2583         }
2584 out:
2585         if (len == towrite)
2586                 return err;
2587         if (inode->i_size < off + len - towrite)
2588                 i_size_write(inode, off + len - towrite);
2589         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
2590         mark_inode_dirty(inode);
2591         return len - towrite;
2592 }
2593
2594 #endif
2595
2596 static struct dentry *get_super_block(struct file_system_type *fs_type,
2597                            int flags, const char *dev_name,
2598                            void *data)
2599 {
2600         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2601 }
2602
2603 static int __init init_reiserfs_fs(void)
2604 {
2605         int ret;
2606
2607         ret = init_inodecache();
2608         if (ret)
2609                 return ret;
2610
2611         reiserfs_proc_info_global_init();
2612
2613         ret = register_filesystem(&reiserfs_fs_type);
2614         if (ret)
2615                 goto out;
2616
2617         return 0;
2618 out:
2619         reiserfs_proc_info_global_done();
2620         destroy_inodecache();
2621
2622         return ret;
2623 }
2624
2625 static void __exit exit_reiserfs_fs(void)
2626 {
2627         reiserfs_proc_info_global_done();
2628         unregister_filesystem(&reiserfs_fs_type);
2629         destroy_inodecache();
2630 }
2631
2632 struct file_system_type reiserfs_fs_type = {
2633         .owner = THIS_MODULE,
2634         .name = "reiserfs",
2635         .mount = get_super_block,
2636         .kill_sb = reiserfs_kill_sb,
2637         .fs_flags = FS_REQUIRES_DEV,
2638 };
2639 MODULE_ALIAS_FS("reiserfs");
2640
2641 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2642 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2643 MODULE_LICENSE("GPL");
2644
2645 module_init(init_reiserfs_fs);
2646 module_exit(exit_reiserfs_fs);