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 & MS_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 & MS_ACTIVE) {
 256                 ms_active_set = 0;
 257         } else {
 258                 ms_active_set = 1;
 259                 s->s_flags |= MS_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 &= ~MS_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 = kmem_cache_alloc(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_i_callback(struct rcu_head *head)
 655 {
 656         struct inode *inode = container_of(head, struct inode, i_rcu);
 657         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 658 }
 659
 660 static void reiserfs_destroy_inode(struct inode *inode)
 661 {
 662         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 663 }
 664
 665 static void init_once(void *foo)
 666 {
 667         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 668
 669         INIT_LIST_HEAD(&ei->i_prealloc_list);
 670         inode_init_once(&ei->vfs_inode);
 671 }
 672
 673 static int __init init_inodecache(void)
 674 {
 675         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 676                                                   sizeof(struct
 677                                                          reiserfs_inode_info),
 678                                                   0, (SLAB_RECLAIM_ACCOUNT|
 679                                                       SLAB_MEM_SPREAD|
 680                                                       SLAB_ACCOUNT),
 681                                                   init_once);
 682         if (reiserfs_inode_cachep == NULL)
 683                 return -ENOMEM;
 684         return 0;
 685 }
 686
 687 static void destroy_inodecache(void)
 688 {
 689         /*
 690          * Make sure all delayed rcu free inodes are flushed before we
 691          * destroy cache.
 692          */
 693         rcu_barrier();
 694         kmem_cache_destroy(reiserfs_inode_cachep);
 695 }
 696
 697 /* we don't mark inodes dirty, we just log them */
 698 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 699 {
 700         struct reiserfs_transaction_handle th;
 701
 702         int err = 0;
 703
 704         if (sb_rdonly(inode->i_sb)) {
 705                 reiserfs_warning(inode->i_sb, "clm-6006",
 706                                  "writing inode %lu on readonly FS",
 707                                  inode->i_ino);
 708                 return;
 709         }
 710         reiserfs_write_lock(inode->i_sb);
 711
 712         /*
 713          * this is really only used for atime updates, so they don't have
 714          * to be included in O_SYNC or fsync
 715          */
 716         err = journal_begin(&th, inode->i_sb, 1);
 717         if (err)
 718                 goto out;
 719
 720         reiserfs_update_sd(&th, inode);
 721         journal_end(&th);
 722
 723 out:
 724         reiserfs_write_unlock(inode->i_sb);
 725 }
 726
 727 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 728 {
 729         struct super_block *s = root->d_sb;
 730         struct reiserfs_journal *journal = SB_JOURNAL(s);
 731         long opts = REISERFS_SB(s)->s_mount_opt;
 732
 733         if (opts & (1 << REISERFS_LARGETAIL))
 734                 seq_puts(seq, ",tails=on");
 735         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 736                 seq_puts(seq, ",notail");
 737         /* tails=small is default so we don't show it */
 738
 739         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 740                 seq_puts(seq, ",barrier=none");
 741         /* barrier=flush is default so we don't show it */
 742
 743         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 744                 seq_puts(seq, ",errors=continue");
 745         else if (opts & (1 << REISERFS_ERROR_PANIC))
 746                 seq_puts(seq, ",errors=panic");
 747         /* errors=ro is default so we don't show it */
 748
 749         if (opts & (1 << REISERFS_DATA_LOG))
 750                 seq_puts(seq, ",data=journal");
 751         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 752                 seq_puts(seq, ",data=writeback");
 753         /* data=ordered is default so we don't show it */
 754
 755         if (opts & (1 << REISERFS_ATTRS))
 756                 seq_puts(seq, ",attrs");
 757
 758         if (opts & (1 << REISERFS_XATTRS_USER))
 759                 seq_puts(seq, ",user_xattr");
 760
 761         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 762                 seq_puts(seq, ",expose_privroot");
 763
 764         if (opts & (1 << REISERFS_POSIXACL))
 765                 seq_puts(seq, ",acl");
 766
 767         if (REISERFS_SB(s)->s_jdev)
 768                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 769
 770         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 771                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 772
 773 #ifdef CONFIG_QUOTA
 774         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 775                 seq_show_option(seq, "usrjquota",
 776                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 777         else if (opts & (1 << REISERFS_USRQUOTA))
 778                 seq_puts(seq, ",usrquota");
 779         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 780                 seq_show_option(seq, "grpjquota",
 781                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 782         else if (opts & (1 << REISERFS_GRPQUOTA))
 783                 seq_puts(seq, ",grpquota");
 784         if (REISERFS_SB(s)->s_jquota_fmt) {
 785                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 786                         seq_puts(seq, ",jqfmt=vfsold");
 787                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 788                         seq_puts(seq, ",jqfmt=vfsv0");
 789         }
 790 #endif
 791
 792         /* Block allocator options */
 793         if (opts & (1 << REISERFS_NO_BORDER))
 794                 seq_puts(seq, ",block-allocator=noborder");
 795         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 796                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 797         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 798                 seq_puts(seq, ",block-allocator=hashed_relocation");
 799         if (opts & (1 << REISERFS_TEST4))
 800                 seq_puts(seq, ",block-allocator=test4");
 801         show_alloc_options(seq, s);
 802         return 0;
 803 }
 804
 805 #ifdef CONFIG_QUOTA
 806 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 807                                     size_t, loff_t);
 808 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 809                                    loff_t);
 810
 811 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 812 {
 813         return REISERFS_I(inode)->i_dquot;
 814 }
 815 #endif
 816
 817 static const struct super_operations reiserfs_sops = {
 818         .alloc_inode = reiserfs_alloc_inode,
 819         .destroy_inode = reiserfs_destroy_inode,
 820         .write_inode = reiserfs_write_inode,
 821         .dirty_inode = reiserfs_dirty_inode,
 822         .evict_inode = reiserfs_evict_inode,
 823         .put_super = reiserfs_put_super,
 824         .sync_fs = reiserfs_sync_fs,
 825         .freeze_fs = reiserfs_freeze,
 826         .unfreeze_fs = reiserfs_unfreeze,
 827         .statfs = reiserfs_statfs,
 828         .remount_fs = reiserfs_remount,
 829         .show_options = reiserfs_show_options,
 830 #ifdef CONFIG_QUOTA
 831         .quota_read = reiserfs_quota_read,
 832         .quota_write = reiserfs_quota_write,
 833         .get_dquots = reiserfs_get_dquots,
 834 #endif
 835 };
 836
 837 #ifdef CONFIG_QUOTA
 838 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 839
 840 static int reiserfs_write_dquot(struct dquot *);
 841 static int reiserfs_acquire_dquot(struct dquot *);
 842 static int reiserfs_release_dquot(struct dquot *);
 843 static int reiserfs_mark_dquot_dirty(struct dquot *);
 844 static int reiserfs_write_info(struct super_block *, int);
 845 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
 846
 847 static const struct dquot_operations reiserfs_quota_operations = {
 848         .write_dquot = reiserfs_write_dquot,
 849         .acquire_dquot = reiserfs_acquire_dquot,
 850         .release_dquot = reiserfs_release_dquot,
 851         .mark_dirty = reiserfs_mark_dquot_dirty,
 852         .write_info = reiserfs_write_info,
 853         .alloc_dquot    = dquot_alloc,
 854         .destroy_dquot  = dquot_destroy,
 855         .get_next_id    = dquot_get_next_id,
 856 };
 857
 858 static const struct quotactl_ops reiserfs_qctl_operations = {
 859         .quota_on = reiserfs_quota_on,
 860         .quota_off = reiserfs_quota_off,
 861         .quota_sync = dquot_quota_sync,
 862         .get_state = dquot_get_state,
 863         .set_info = dquot_set_dqinfo,
 864         .get_dqblk = dquot_get_dqblk,
 865         .set_dqblk = dquot_set_dqblk,
 866 };
 867 #endif
 868
 869 static const struct export_operations reiserfs_export_ops = {
 870         .encode_fh = reiserfs_encode_fh,
 871         .fh_to_dentry = reiserfs_fh_to_dentry,
 872         .fh_to_parent = reiserfs_fh_to_parent,
 873         .get_parent = reiserfs_get_parent,
 874 };
 875
 876 /*
 877  * this struct is used in reiserfs_getopt () for containing the value for
 878  * those mount options that have values rather than being toggles.
 879  */
 880 typedef struct {
 881         char *value;
 882         /*
 883          * bitmask which is to set on mount_options bitmask
 884          * when this value is found, 0 is no bits are to be changed.
 885          */
 886         int setmask;
 887         /*
 888          * bitmask which is to clear on mount_options bitmask
 889          * when this value is found, 0 is no bits are to be changed.
 890          * This is applied BEFORE setmask
 891          */
 892         int clrmask;
 893 } arg_desc_t;
 894
 895 /* Set this bit in arg_required to allow empty arguments */
 896 #define REISERFS_OPT_ALLOWEMPTY 31
 897
 898 /*
 899  * this struct is used in reiserfs_getopt() for describing the
 900  * set of reiserfs mount options
 901  */
 902 typedef struct {
 903         char *option_name;
 904
 905         /* 0 if argument is not required, not 0 otherwise */
 906         int arg_required;
 907
 908         /* list of values accepted by an option */
 909         const arg_desc_t *values;
 910
 911         /*
 912          * bitmask which is to set on mount_options bitmask
 913          * when this value is found, 0 is no bits are to be changed.
 914          */
 915         int setmask;
 916
 917         /*
 918          * bitmask which is to clear on mount_options bitmask
 919          * when this value is found, 0 is no bits are to be changed.
 920          * This is applied BEFORE setmask
 921          */
 922         int clrmask;
 923 } opt_desc_t;
 924
 925 /* possible values for -o data= */
 926 static const arg_desc_t logging_mode[] = {
 927         {"ordered", 1 << REISERFS_DATA_ORDERED,
 928          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 929         {"journal", 1 << REISERFS_DATA_LOG,
 930          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 931         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 932          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 933         {.value = NULL}
 934 };
 935
 936 /* possible values for -o barrier= */
 937 static const arg_desc_t barrier_mode[] = {
 938         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 939         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 940         {.value = NULL}
 941 };
 942
 943 /*
 944  * possible values for "-o block-allocator=" and bits which are to be set in
 945  * s_mount_opt of reiserfs specific part of in-core super block
 946  */
 947 static const arg_desc_t balloc[] = {
 948         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 949         {"border", 0, 1 << REISERFS_NO_BORDER},
 950         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 951         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 952         {"test4", 1 << REISERFS_TEST4, 0},
 953         {"notest4", 0, 1 << REISERFS_TEST4},
 954         {NULL, 0, 0}
 955 };
 956
 957 static const arg_desc_t tails[] = {
 958         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 959         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 960         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 961         {NULL, 0, 0}
 962 };
 963
 964 static const arg_desc_t error_actions[] = {
 965         {"panic", 1 << REISERFS_ERROR_PANIC,
 966          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 967         {"ro-remount", 1 << REISERFS_ERROR_RO,
 968          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 969 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 970         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 971          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 972 #endif
 973         {NULL, 0, 0},
 974 };
 975
 976 /*
 977  * proceed only one option from a list *cur - string containing of mount
 978  * options
 979  * opts - array of options which are accepted
 980  * opt_arg - if option is found and requires an argument and if it is specifed
 981  * in the input - pointer to the argument is stored here
 982  * bit_flags - if option requires to set a certain bit - it is set here
 983  * return -1 if unknown option is found, opt->arg_required otherwise
 984  */
 985 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 986                            char **opt_arg, unsigned long *bit_flags)
 987 {
 988         char *p;
 989         /*
 990          * foo=bar,
 991          * ^   ^  ^
 992          * |   |  +-- option_end
 993          * |   +-- arg_start
 994          * +-- option_start
 995          */
 996         const opt_desc_t *opt;
 997         const arg_desc_t *arg;
 998
 999         p = *cur;
1000
1001         /* assume argument cannot contain commas */
1002         *cur = strchr(p, ',');
1003         if (*cur) {
1004                 *(*cur) = '\0';
1005                 (*cur)++;
1006         }
1007
1008         if (!strncmp(p, "alloc=", 6)) {
1009                 /*
1010                  * Ugly special case, probably we should redo options
1011                  * parser so that it can understand several arguments for
1012                  * some options, also so that it can fill several bitfields
1013                  * with option values.
1014                  */
1015                 if (reiserfs_parse_alloc_options(s, p + 6)) {
1016                         return -1;
1017                 } else {
1018                         return 0;
1019                 }
1020         }
1021
1022         /* for every option in the list */
1023         for (opt = opts; opt->option_name; opt++) {
1024                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1025                         if (bit_flags) {
1026                                 if (opt->clrmask ==
1027                                     (1 << REISERFS_UNSUPPORTED_OPT))
1028                                         reiserfs_warning(s, "super-6500",
1029                                                          "%s not supported.\n",
1030                                                          p);
1031                                 else
1032                                         *bit_flags &= ~opt->clrmask;
1033                                 if (opt->setmask ==
1034                                     (1 << REISERFS_UNSUPPORTED_OPT))
1035                                         reiserfs_warning(s, "super-6501",
1036                                                          "%s not supported.\n",
1037                                                          p);
1038                                 else
1039                                         *bit_flags |= opt->setmask;
1040                         }
1041                         break;
1042                 }
1043         }
1044         if (!opt->option_name) {
1045                 reiserfs_warning(s, "super-6502",
1046                                  "unknown mount option \"%s\"", p);
1047                 return -1;
1048         }
1049
1050         p += strlen(opt->option_name);
1051         switch (*p) {
1052         case '=':
1053                 if (!opt->arg_required) {
1054                         reiserfs_warning(s, "super-6503",
1055                                          "the option \"%s\" does not "
1056                                          "require an argument\n",
1057                                          opt->option_name);
1058                         return -1;
1059                 }
1060                 break;
1061
1062         case 0:
1063                 if (opt->arg_required) {
1064                         reiserfs_warning(s, "super-6504",
1065                                          "the option \"%s\" requires an "
1066                                          "argument\n", opt->option_name);
1067                         return -1;
1068                 }
1069                 break;
1070         default:
1071                 reiserfs_warning(s, "super-6505",
1072                                  "head of option \"%s\" is only correct\n",
1073                                  opt->option_name);
1074                 return -1;
1075         }
1076
1077         /*
1078          * move to the argument, or to next option if argument is not
1079          * required
1080          */
1081         p++;
1082
1083         if (opt->arg_required
1084             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1085             && !strlen(p)) {
1086                 /* this catches "option=," if not allowed */
1087                 reiserfs_warning(s, "super-6506",
1088                                  "empty argument for \"%s\"\n",
1089                                  opt->option_name);
1090                 return -1;
1091         }
1092
1093         if (!opt->values) {
1094                 /* *=NULLopt_arg contains pointer to argument */
1095                 *opt_arg = p;
1096                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1097         }
1098
1099         /* values possible for this option are listed in opt->values */
1100         for (arg = opt->values; arg->value; arg++) {
1101                 if (!strcmp(p, arg->value)) {
1102                         if (bit_flags) {
1103                                 *bit_flags &= ~arg->clrmask;
1104                                 *bit_flags |= arg->setmask;
1105                         }
1106                         return opt->arg_required;
1107                 }
1108         }
1109
1110         reiserfs_warning(s, "super-6506",
1111                          "bad value \"%s\" for option \"%s\"\n", p,
1112                          opt->option_name);
1113         return -1;
1114 }
1115
1116 /* returns 0 if something is wrong in option string, 1 - otherwise */
1117 static int reiserfs_parse_options(struct super_block *s,
1118
1119                                   /* string given via mount's -o */
1120                                   char *options,
1121
1122                                   /*
1123                                    * after the parsing phase, contains the
1124                                    * collection of bitflags defining what
1125                                    * mount options were selected.
1126                                    */
1127                                   unsigned long *mount_options,
1128
1129                                   /* strtol-ed from NNN of resize=NNN */
1130                                   unsigned long *blocks,
1131                                   char **jdev_name,
1132                                   unsigned int *commit_max_age,
1133                                   char **qf_names,
1134                                   unsigned int *qfmt)
1135 {
1136         int c;
1137         char *arg = NULL;
1138         char *pos;
1139         opt_desc_t opts[] = {
1140                 /*
1141                  * Compatibility stuff, so that -o notail for old
1142                  * setups still work
1143                  */
1144                 {"tails",.arg_required = 't',.values = tails},
1145                 {"notail",.clrmask =
1146                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1147                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1148                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1149                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1150                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1151 #ifdef CONFIG_REISERFS_FS_XATTR
1152                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1153                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1154 #else
1155                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1156                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1157 #endif
1158 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1159                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1160                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1161 #else
1162                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1163                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1164 #endif
1165                 {.option_name = "nolog"},
1166                 {"replayonly",.setmask = 1 << REPLAYONLY},
1167                 {"block-allocator",.arg_required = 'a',.values = balloc},
1168                 {"data",.arg_required = 'd',.values = logging_mode},
1169                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1170                 {"resize",.arg_required = 'r',.values = NULL},
1171                 {"jdev",.arg_required = 'j',.values = NULL},
1172                 {"nolargeio",.arg_required = 'w',.values = NULL},
1173                 {"commit",.arg_required = 'c',.values = NULL},
1174                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1175                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1176                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1177                 {"errors",.arg_required = 'e',.values = error_actions},
1178                 {"usrjquota",.arg_required =
1179                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1180                 {"grpjquota",.arg_required =
1181                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1182                 {"jqfmt",.arg_required = 'f',.values = NULL},
1183                 {.option_name = NULL}
1184         };
1185
1186         *blocks = 0;
1187         if (!options || !*options)
1188                 /*
1189                  * use default configuration: create tails, journaling on, no
1190                  * conversion to newest format
1191                  */
1192                 return 1;
1193
1194         for (pos = options; pos;) {
1195                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1196                 if (c == -1)
1197                         /* wrong option is given */
1198                         return 0;
1199
1200                 if (c == 'r') {
1201                         char *p;
1202
1203                         p = NULL;
1204                         /* "resize=NNN" or "resize=auto" */
1205
1206                         if (!strcmp(arg, "auto")) {
1207                                 /* From JFS code, to auto-get the size. */
1208                                 *blocks =
1209                                     i_size_read(s->s_bdev->bd_inode) >> s->
1210                                     s_blocksize_bits;
1211                         } else {
1212                                 *blocks = simple_strtoul(arg, &p, 0);
1213                                 if (*p != '\0') {
1214                                         /* NNN does not look like a number */
1215                                         reiserfs_warning(s, "super-6507",
1216                                                          "bad value %s for "
1217                                                          "-oresize\n", arg);
1218                                         return 0;
1219                                 }
1220                         }
1221                 }
1222
1223                 if (c == 'c') {
1224                         char *p = NULL;
1225                         unsigned long val = simple_strtoul(arg, &p, 0);
1226                         /* commit=NNN (time in seconds) */
1227                         if (*p != '\0' || val >= (unsigned int)-1) {
1228                                 reiserfs_warning(s, "super-6508",
1229                                                  "bad value %s for -ocommit\n",
1230                                                  arg);
1231                                 return 0;
1232                         }
1233                         *commit_max_age = (unsigned int)val;
1234                 }
1235
1236                 if (c == 'w') {
1237                         reiserfs_warning(s, "super-6509", "nolargeio option "
1238                                          "is no longer supported");
1239                         return 0;
1240                 }
1241
1242                 if (c == 'j') {
1243                         if (arg && *arg && jdev_name) {
1244                                 /* Hm, already assigned? */
1245                                 if (*jdev_name) {
1246                                         reiserfs_warning(s, "super-6510",
1247                                                          "journal device was "
1248                                                          "already specified to "
1249                                                          "be %s", *jdev_name);
1250                                         return 0;
1251                                 }
1252                                 *jdev_name = arg;
1253                         }
1254                 }
1255 #ifdef CONFIG_QUOTA
1256                 if (c == 'u' || c == 'g') {
1257                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1258
1259                         if (sb_any_quota_loaded(s) &&
1260                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1261                                 reiserfs_warning(s, "super-6511",
1262                                                  "cannot change journaled "
1263                                                  "quota options when quota "
1264                                                  "turned on.");
1265                                 return 0;
1266                         }
1267                         if (qf_names[qtype] !=
1268                             REISERFS_SB(s)->s_qf_names[qtype])
1269                                 kfree(qf_names[qtype]);
1270                         qf_names[qtype] = NULL;
1271                         if (*arg) {     /* Some filename specified? */
1272                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1273                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1274                                               arg)) {
1275                                         reiserfs_warning(s, "super-6512",
1276                                                          "%s quota file "
1277                                                          "already specified.",
1278                                                          QTYPE2NAME(qtype));
1279                                         return 0;
1280                                 }
1281                                 if (strchr(arg, '/')) {
1282                                         reiserfs_warning(s, "super-6513",
1283                                                          "quotafile must be "
1284                                                          "on filesystem root.");
1285                                         return 0;
1286                                 }
1287                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1288                                 if (!qf_names[qtype]) {
1289                                         reiserfs_warning(s, "reiserfs-2502",
1290                                                          "not enough memory "
1291                                                          "for storing "
1292                                                          "quotafile name.");
1293                                         return 0;
1294                                 }
1295                                 if (qtype == USRQUOTA)
1296                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1297                                 else
1298                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1299                         } else {
1300                                 if (qtype == USRQUOTA)
1301                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1302                                 else
1303                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1304                         }
1305                 }
1306                 if (c == 'f') {
1307                         if (!strcmp(arg, "vfsold"))
1308                                 *qfmt = QFMT_VFS_OLD;
1309                         else if (!strcmp(arg, "vfsv0"))
1310                                 *qfmt = QFMT_VFS_V0;
1311                         else {
1312                                 reiserfs_warning(s, "super-6514",
1313                                                  "unknown quota format "
1314                                                  "specified.");
1315                                 return 0;
1316                         }
1317                         if (sb_any_quota_loaded(s) &&
1318                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1319                                 reiserfs_warning(s, "super-6515",
1320                                                  "cannot change journaled "
1321                                                  "quota options when quota "
1322                                                  "turned on.");
1323                                 return 0;
1324                         }
1325                 }
1326 #else
1327                 if (c == 'u' || c == 'g' || c == 'f') {
1328                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1329                                          "quota options not supported.");
1330                         return 0;
1331                 }
1332 #endif
1333         }
1334
1335 #ifdef CONFIG_QUOTA
1336         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1337             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1338                 reiserfs_warning(s, "super-6515",
1339                                  "journaled quota format not specified.");
1340                 return 0;
1341         }
1342         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1343                sb_has_quota_loaded(s, USRQUOTA)) ||
1344             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1345                sb_has_quota_loaded(s, GRPQUOTA))) {
1346                 reiserfs_warning(s, "super-6516", "quota options must "
1347                                  "be present when quota is turned on.");
1348                 return 0;
1349         }
1350 #endif
1351
1352         return 1;
1353 }
1354
1355 static void switch_data_mode(struct super_block *s, unsigned long mode)
1356 {
1357         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1358                                          (1 << REISERFS_DATA_ORDERED) |
1359                                          (1 << REISERFS_DATA_WRITEBACK));
1360         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1361 }
1362
1363 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1364 {
1365         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1366                 if (!reiserfs_data_log(s)) {
1367                         switch_data_mode(s, REISERFS_DATA_LOG);
1368                         reiserfs_info(s, "switching to journaled data mode\n");
1369                 }
1370         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1371                 if (!reiserfs_data_ordered(s)) {
1372                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1373                         reiserfs_info(s, "switching to ordered data mode\n");
1374                 }
1375         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1376                 if (!reiserfs_data_writeback(s)) {
1377                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1378                         reiserfs_info(s, "switching to writeback data mode\n");
1379                 }
1380         }
1381 }
1382
1383 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1384 {
1385         int flush = (1 << REISERFS_BARRIER_FLUSH);
1386         int none = (1 << REISERFS_BARRIER_NONE);
1387         int all_barrier = flush | none;
1388
1389         if (bits & all_barrier) {
1390                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1391                 if (bits & flush) {
1392                         REISERFS_SB(s)->s_mount_opt |= flush;
1393                         printk("reiserfs: enabling write barrier flush mode\n");
1394                 } else if (bits & none) {
1395                         REISERFS_SB(s)->s_mount_opt |= none;
1396                         printk("reiserfs: write barriers turned off\n");
1397                 }
1398         }
1399 }
1400
1401 static void handle_attrs(struct super_block *s)
1402 {
1403         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1404
1405         if (reiserfs_attrs(s)) {
1406                 if (old_format_only(s)) {
1407                         reiserfs_warning(s, "super-6517", "cannot support "
1408                                          "attributes on 3.5.x disk format");
1409                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1410                         return;
1411                 }
1412                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1413                         reiserfs_warning(s, "super-6518", "cannot support "
1414                                          "attributes until flag is set in "
1415                                          "super-block");
1416                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1417                 }
1418         }
1419 }
1420
1421 #ifdef CONFIG_QUOTA
1422 static void handle_quota_files(struct super_block *s, char **qf_names,
1423                                unsigned int *qfmt)
1424 {
1425         int i;
1426
1427         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1428                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1429                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1430                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1431         }
1432         if (*qfmt)
1433                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1434 }
1435 #endif
1436
1437 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1438 {
1439         struct reiserfs_super_block *rs;
1440         struct reiserfs_transaction_handle th;
1441         unsigned long blocks;
1442         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1443         unsigned long safe_mask = 0;
1444         unsigned int commit_max_age = (unsigned int)-1;
1445         struct reiserfs_journal *journal = SB_JOURNAL(s);
1446         char *new_opts;
1447         int err;
1448         char *qf_names[REISERFS_MAXQUOTAS];
1449         unsigned int qfmt = 0;
1450 #ifdef CONFIG_QUOTA
1451         int i;
1452 #endif
1453
1454         new_opts = kstrdup(arg, GFP_KERNEL);
1455         if (arg && !new_opts)
1456                 return -ENOMEM;
1457
1458         sync_filesystem(s);
1459         reiserfs_write_lock(s);
1460
1461 #ifdef CONFIG_QUOTA
1462         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1463 #endif
1464
1465         rs = SB_DISK_SUPER_BLOCK(s);
1466
1467         if (!reiserfs_parse_options
1468             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1469             qf_names, &qfmt)) {
1470 #ifdef CONFIG_QUOTA
1471                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1472                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1473                                 kfree(qf_names[i]);
1474 #endif
1475                 err = -EINVAL;
1476                 goto out_err_unlock;
1477         }
1478 #ifdef CONFIG_QUOTA
1479         handle_quota_files(s, qf_names, &qfmt);
1480 #endif
1481
1482         handle_attrs(s);
1483
1484         /* Add options that are safe here */
1485         safe_mask |= 1 << REISERFS_SMALLTAIL;
1486         safe_mask |= 1 << REISERFS_LARGETAIL;
1487         safe_mask |= 1 << REISERFS_NO_BORDER;
1488         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1489         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1490         safe_mask |= 1 << REISERFS_TEST4;
1491         safe_mask |= 1 << REISERFS_ATTRS;
1492         safe_mask |= 1 << REISERFS_XATTRS_USER;
1493         safe_mask |= 1 << REISERFS_POSIXACL;
1494         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1495         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1496         safe_mask |= 1 << REISERFS_ERROR_RO;
1497         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1498         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1499         safe_mask |= 1 << REISERFS_USRQUOTA;
1500         safe_mask |= 1 << REISERFS_GRPQUOTA;
1501
1502         /*
1503          * Update the bitmask, taking care to keep
1504          * the bits we're not allowed to change here
1505          */
1506         REISERFS_SB(s)->s_mount_opt =
1507             (REISERFS_SB(s)->
1508              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1509
1510         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1511                 journal->j_max_commit_age = commit_max_age;
1512                 journal->j_max_trans_age = commit_max_age;
1513         } else if (commit_max_age == 0) {
1514                 /* 0 means restore defaults. */
1515                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1516                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1517         }
1518
1519         if (blocks) {
1520                 err = reiserfs_resize(s, blocks);
1521                 if (err != 0)
1522                         goto out_err_unlock;
1523         }
1524
1525         if (*mount_flags & MS_RDONLY) {
1526                 reiserfs_write_unlock(s);
1527                 reiserfs_xattr_init(s, *mount_flags);
1528                 /* remount read-only */
1529                 if (sb_rdonly(s))
1530                         /* it is read-only already */
1531                         goto out_ok_unlocked;
1532
1533                 err = dquot_suspend(s, -1);
1534                 if (err < 0)
1535                         goto out_err;
1536
1537                 /* try to remount file system with read-only permissions */
1538                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1539                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1540                         goto out_ok_unlocked;
1541                 }
1542
1543                 reiserfs_write_lock(s);
1544
1545                 err = journal_begin(&th, s, 10);
1546                 if (err)
1547                         goto out_err_unlock;
1548
1549                 /* Mounting a rw partition read-only. */
1550                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1551                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1552                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1553         } else {
1554                 /* remount read-write */
1555                 if (!sb_rdonly(s)) {
1556                         reiserfs_write_unlock(s);
1557                         reiserfs_xattr_init(s, *mount_flags);
1558                         goto out_ok_unlocked;   /* We are read-write already */
1559                 }
1560
1561                 if (reiserfs_is_journal_aborted(journal)) {
1562                         err = journal->j_errno;
1563                         goto out_err_unlock;
1564                 }
1565
1566                 handle_data_mode(s, mount_options);
1567                 handle_barrier_mode(s, mount_options);
1568                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1569
1570                 /* now it is safe to call journal_begin */
1571                 s->s_flags &= ~MS_RDONLY;
1572                 err = journal_begin(&th, s, 10);
1573                 if (err)
1574                         goto out_err_unlock;
1575
1576                 /* Mount a partition which is read-only, read-write */
1577                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1578                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1579                 s->s_flags &= ~MS_RDONLY;
1580                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1581                 if (!old_format_only(s))
1582                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1583                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1584                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1585                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1586         }
1587         /* this will force a full flush of all journal lists */
1588         SB_JOURNAL(s)->j_must_wait = 1;
1589         err = journal_end(&th);
1590         if (err)
1591                 goto out_err_unlock;
1592
1593         reiserfs_write_unlock(s);
1594         if (!(*mount_flags & MS_RDONLY)) {
1595                 dquot_resume(s, -1);
1596                 reiserfs_write_lock(s);
1597                 finish_unfinished(s);
1598                 reiserfs_write_unlock(s);
1599                 reiserfs_xattr_init(s, *mount_flags);
1600         }
1601
1602 out_ok_unlocked:
1603         return 0;
1604
1605 out_err_unlock:
1606         reiserfs_write_unlock(s);
1607 out_err:
1608         kfree(new_opts);
1609         return err;
1610 }
1611
1612 static int read_super_block(struct super_block *s, int offset)
1613 {
1614         struct buffer_head *bh;
1615         struct reiserfs_super_block *rs;
1616         int fs_blocksize;
1617
1618         bh = sb_bread(s, offset / s->s_blocksize);
1619         if (!bh) {
1620                 reiserfs_warning(s, "sh-2006",
1621                                  "bread failed (dev %s, block %lu, size %lu)",
1622                                  s->s_id, offset / s->s_blocksize,
1623                                  s->s_blocksize);
1624                 return 1;
1625         }
1626
1627         rs = (struct reiserfs_super_block *)bh->b_data;
1628         if (!is_any_reiserfs_magic_string(rs)) {
1629                 brelse(bh);
1630                 return 1;
1631         }
1632         /*
1633          * ok, reiserfs signature (old or new) found in at the given offset
1634          */
1635         fs_blocksize = sb_blocksize(rs);
1636         brelse(bh);
1637         sb_set_blocksize(s, fs_blocksize);
1638
1639         bh = sb_bread(s, offset / s->s_blocksize);
1640         if (!bh) {
1641                 reiserfs_warning(s, "sh-2007",
1642                                  "bread failed (dev %s, block %lu, size %lu)",
1643                                  s->s_id, offset / s->s_blocksize,
1644                                  s->s_blocksize);
1645                 return 1;
1646         }
1647
1648         rs = (struct reiserfs_super_block *)bh->b_data;
1649         if (sb_blocksize(rs) != s->s_blocksize) {
1650                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1651                                  "filesystem on (dev %s, block %llu, size %lu)",
1652                                  s->s_id,
1653                                  (unsigned long long)bh->b_blocknr,
1654                                  s->s_blocksize);
1655                 brelse(bh);
1656                 return 1;
1657         }
1658
1659         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1660                 brelse(bh);
1661                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1662                                  "--rebuild-tree run detected. Please run\n"
1663                                  "reiserfsck --rebuild-tree and wait for a "
1664                                  "completion. If that fails\n"
1665                                  "get newer reiserfsprogs package");
1666                 return 1;
1667         }
1668
1669         SB_BUFFER_WITH_SB(s) = bh;
1670         SB_DISK_SUPER_BLOCK(s) = rs;
1671
1672         /*
1673          * magic is of non-standard journal filesystem, look at s_version to
1674          * find which format is in use
1675          */
1676         if (is_reiserfs_jr(rs)) {
1677                 if (sb_version(rs) == REISERFS_VERSION_2)
1678                         reiserfs_info(s, "found reiserfs format \"3.6\""
1679                                       " with non-standard journal\n");
1680                 else if (sb_version(rs) == REISERFS_VERSION_1)
1681                         reiserfs_info(s, "found reiserfs format \"3.5\""
1682                                       " with non-standard journal\n");
1683                 else {
1684                         reiserfs_warning(s, "sh-2012", "found unknown "
1685                                          "format \"%u\" of reiserfs with "
1686                                          "non-standard magic", sb_version(rs));
1687                         return 1;
1688                 }
1689         } else
1690                 /*
1691                  * s_version of standard format may contain incorrect
1692                  * information, so we just look at the magic string
1693                  */
1694                 reiserfs_info(s,
1695                               "found reiserfs format \"%s\" with standard journal\n",
1696                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1697
1698         s->s_op = &reiserfs_sops;
1699         s->s_export_op = &reiserfs_export_ops;
1700 #ifdef CONFIG_QUOTA
1701         s->s_qcop = &reiserfs_qctl_operations;
1702         s->dq_op = &reiserfs_quota_operations;
1703         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1704 #endif
1705
1706         /*
1707          * new format is limited by the 32 bit wide i_blocks field, want to
1708          * be one full block below that.
1709          */
1710         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1711         return 0;
1712 }
1713
1714 /* after journal replay, reread all bitmap and super blocks */
1715 static int reread_meta_blocks(struct super_block *s)
1716 {
1717         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1718         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1719         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1720                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1721                 return 1;
1722         }
1723
1724         return 0;
1725 }
1726
1727 /* hash detection stuff */
1728
1729 /*
1730  * if root directory is empty - we set default - Yura's - hash and
1731  * warn about it
1732  * FIXME: we look for only one name in a directory. If tea and yura
1733  * both have the same value - we ask user to send report to the
1734  * mailing list
1735  */
1736 static __u32 find_hash_out(struct super_block *s)
1737 {
1738         int retval;
1739         struct inode *inode;
1740         struct cpu_key key;
1741         INITIALIZE_PATH(path);
1742         struct reiserfs_dir_entry de;
1743         struct reiserfs_de_head *deh;
1744         __u32 hash = DEFAULT_HASH;
1745         __u32 deh_hashval, teahash, r5hash, yurahash;
1746
1747         inode = d_inode(s->s_root);
1748
1749         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1750         retval = search_by_entry_key(s, &key, &path, &de);
1751         if (retval == IO_ERROR) {
1752                 pathrelse(&path);
1753                 return UNSET_HASH;
1754         }
1755         if (retval == NAME_NOT_FOUND)
1756                 de.de_entry_num--;
1757
1758         set_de_name_and_namelen(&de);
1759         deh = de.de_deh + de.de_entry_num;
1760
1761         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1762                 /* allow override in this case */
1763                 if (reiserfs_rupasov_hash(s))
1764                         hash = YURA_HASH;
1765                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1766                 goto out;
1767         }
1768
1769         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1770         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1771         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1772         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1773
1774         if ((teahash == r5hash && deh_hashval == r5hash) ||
1775             (teahash == yurahash && deh_hashval == yurahash) ||
1776             (r5hash == yurahash && deh_hashval == yurahash)) {
1777                 reiserfs_warning(s, "reiserfs-2506",
1778                                  "Unable to automatically detect hash "
1779                                  "function. Please mount with -o "
1780                                  "hash={tea,rupasov,r5}");
1781                 hash = UNSET_HASH;
1782                 goto out;
1783         }
1784
1785         if (deh_hashval == yurahash)
1786                 hash = YURA_HASH;
1787         else if (deh_hashval == teahash)
1788                 hash = TEA_HASH;
1789         else if (deh_hashval == r5hash)
1790                 hash = R5_HASH;
1791         else {
1792                 reiserfs_warning(s, "reiserfs-2506",
1793                                  "Unrecognised hash function");
1794                 hash = UNSET_HASH;
1795         }
1796 out:
1797         pathrelse(&path);
1798         return hash;
1799 }
1800
1801 /* finds out which hash names are sorted with */
1802 static int what_hash(struct super_block *s)
1803 {
1804         __u32 code;
1805
1806         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1807
1808         /*
1809          * reiserfs_hash_detect() == true if any of the hash mount options
1810          * were used.  We must check them to make sure the user isn't
1811          * using a bad hash value
1812          */
1813         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1814                 code = find_hash_out(s);
1815
1816         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1817                 /*
1818                  * detection has found the hash, and we must check against the
1819                  * mount options
1820                  */
1821                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1822                         reiserfs_warning(s, "reiserfs-2507",
1823                                          "Error, %s hash detected, "
1824                                          "unable to force rupasov hash",
1825                                          reiserfs_hashname(code));
1826                         code = UNSET_HASH;
1827                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1828                         reiserfs_warning(s, "reiserfs-2508",
1829                                          "Error, %s hash detected, "
1830                                          "unable to force tea hash",
1831                                          reiserfs_hashname(code));
1832                         code = UNSET_HASH;
1833                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1834                         reiserfs_warning(s, "reiserfs-2509",
1835                                          "Error, %s hash detected, "
1836                                          "unable to force r5 hash",
1837                                          reiserfs_hashname(code));
1838                         code = UNSET_HASH;
1839                 }
1840         } else {
1841                 /*
1842                  * find_hash_out was not called or
1843                  * could not determine the hash
1844                  */
1845                 if (reiserfs_rupasov_hash(s)) {
1846                         code = YURA_HASH;
1847                 } else if (reiserfs_tea_hash(s)) {
1848                         code = TEA_HASH;
1849                 } else if (reiserfs_r5_hash(s)) {
1850                         code = R5_HASH;
1851                 }
1852         }
1853
1854         /*
1855          * if we are mounted RW, and we have a new valid hash code, update
1856          * the super
1857          */
1858         if (code != UNSET_HASH &&
1859             !sb_rdonly(s) &&
1860             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1861                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1862         }
1863         return code;
1864 }
1865
1866 /* return pointer to appropriate function */
1867 static hashf_t hash_function(struct super_block *s)
1868 {
1869         switch (what_hash(s)) {
1870         case TEA_HASH:
1871                 reiserfs_info(s, "Using tea hash to sort names\n");
1872                 return keyed_hash;
1873         case YURA_HASH:
1874                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1875                 return yura_hash;
1876         case R5_HASH:
1877                 reiserfs_info(s, "Using r5 hash to sort names\n");
1878                 return r5_hash;
1879         }
1880         return NULL;
1881 }
1882
1883 /* this is used to set up correct value for old partitions */
1884 static int function2code(hashf_t func)
1885 {
1886         if (func == keyed_hash)
1887                 return TEA_HASH;
1888         if (func == yura_hash)
1889                 return YURA_HASH;
1890         if (func == r5_hash)
1891                 return R5_HASH;
1892
1893         BUG();                  /* should never happen */
1894
1895         return 0;
1896 }
1897
1898 #define SWARN(silent, s, id, ...)                       \
1899         if (!(silent))                          \
1900                 reiserfs_warning(s, id, __VA_ARGS__)
1901
1902 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1903 {
1904         struct inode *root_inode;
1905         struct reiserfs_transaction_handle th;
1906         int old_format = 0;
1907         unsigned long blocks;
1908         unsigned int commit_max_age = 0;
1909         int jinit_done = 0;
1910         struct reiserfs_iget_args args;
1911         struct reiserfs_super_block *rs;
1912         char *jdev_name;
1913         struct reiserfs_sb_info *sbi;
1914         int errval = -EINVAL;
1915         char *qf_names[REISERFS_MAXQUOTAS] = {};
1916         unsigned int qfmt = 0;
1917
1918         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1919         if (!sbi)
1920                 return -ENOMEM;
1921         s->s_fs_info = sbi;
1922         /* Set default values for options: non-aggressive tails, RO on errors */
1923         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1924         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1925         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1926         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1927         sbi->s_alloc_options.preallocmin = 0;
1928         /* Preallocate by 16 blocks (17-1) at once */
1929         sbi->s_alloc_options.preallocsize = 17;
1930         /* setup default block allocator options */
1931         reiserfs_init_alloc_options(s);
1932
1933         spin_lock_init(&sbi->old_work_lock);
1934         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1935         mutex_init(&sbi->lock);
1936         sbi->lock_depth = -1;
1937
1938         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1939                                          s->s_id);
1940         if (!sbi->commit_wq) {
1941                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1942                 errval = -ENOMEM;
1943                 goto error_unlocked;
1944         }
1945
1946         jdev_name = NULL;
1947         if (reiserfs_parse_options
1948             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1949              &commit_max_age, qf_names, &qfmt) == 0) {
1950                 goto error_unlocked;
1951         }
1952         if (jdev_name && jdev_name[0]) {
1953                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1954                 if (!sbi->s_jdev) {
1955                         SWARN(silent, s, "", "Cannot allocate memory for "
1956                                 "journal device name");
1957                         goto error_unlocked;
1958                 }
1959         }
1960 #ifdef CONFIG_QUOTA
1961         handle_quota_files(s, qf_names, &qfmt);
1962 #endif
1963
1964         if (blocks) {
1965                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1966                 goto error_unlocked;
1967         }
1968
1969         /*
1970          * try old format (undistributed bitmap, super block in 8-th 1k
1971          * block of a device)
1972          */
1973         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1974                 old_format = 1;
1975
1976         /*
1977          * try new format (64-th 1k block), which can contain reiserfs
1978          * super block
1979          */
1980         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1981                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1982                       s->s_id);
1983                 goto error_unlocked;
1984         }
1985
1986         rs = SB_DISK_SUPER_BLOCK(s);
1987         /*
1988          * Let's do basic sanity check to verify that underlying device is not
1989          * smaller than the filesystem. If the check fails then abort and
1990          * scream, because bad stuff will happen otherwise.
1991          */
1992         if (s->s_bdev && s->s_bdev->bd_inode
1993             && i_size_read(s->s_bdev->bd_inode) <
1994             sb_block_count(rs) * sb_blocksize(rs)) {
1995                 SWARN(silent, s, "", "Filesystem cannot be "
1996                       "mounted because it is bigger than the device");
1997                 SWARN(silent, s, "", "You may need to run fsck "
1998                       "or increase size of your LVM partition");
1999                 SWARN(silent, s, "", "Or may be you forgot to "
2000                       "reboot after fdisk when it told you to");
2001                 goto error_unlocked;
2002         }
2003
2004         sbi->s_mount_state = SB_REISERFS_STATE(s);
2005         sbi->s_mount_state = REISERFS_VALID_FS;
2006
2007         if ((errval = reiserfs_init_bitmap_cache(s))) {
2008                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2009                 goto error_unlocked;
2010         }
2011
2012         errval = -EINVAL;
2013 #ifdef CONFIG_REISERFS_CHECK
2014         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2015         SWARN(silent, s, "", "- it is slow mode for debugging.");
2016 #endif
2017
2018         /* make data=ordered the default */
2019         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2020             !reiserfs_data_writeback(s)) {
2021                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2022         }
2023
2024         if (reiserfs_data_log(s)) {
2025                 reiserfs_info(s, "using journaled data mode\n");
2026         } else if (reiserfs_data_ordered(s)) {
2027                 reiserfs_info(s, "using ordered data mode\n");
2028         } else {
2029                 reiserfs_info(s, "using writeback data mode\n");
2030         }
2031         if (reiserfs_barrier_flush(s)) {
2032                 printk("reiserfs: using flush barriers\n");
2033         }
2034
2035         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2036                 SWARN(silent, s, "sh-2022",
2037                       "unable to initialize journal space");
2038                 goto error_unlocked;
2039         } else {
2040                 /*
2041                  * once this is set, journal_release must be called
2042                  * if we error out of the mount
2043                  */
2044                 jinit_done = 1;
2045         }
2046
2047         if (reread_meta_blocks(s)) {
2048                 SWARN(silent, s, "jmacd-9",
2049                       "unable to reread meta blocks after journal init");
2050                 goto error_unlocked;
2051         }
2052
2053         if (replay_only(s))
2054                 goto error_unlocked;
2055
2056         s->s_xattr = reiserfs_xattr_handlers;
2057
2058         if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2059                 SWARN(silent, s, "clm-7000",
2060                       "Detected readonly device, marking FS readonly");
2061                 s->s_flags |= MS_RDONLY;
2062         }
2063         args.objectid = REISERFS_ROOT_OBJECTID;
2064         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2065         root_inode =
2066             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2067                          reiserfs_init_locked_inode, (void *)&args);
2068         if (!root_inode) {
2069                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2070                 goto error_unlocked;
2071         }
2072
2073         /*
2074          * This path assumed to be called with the BKL in the old times.
2075          * Now we have inherited the big reiserfs lock from it and many
2076          * reiserfs helpers called in the mount path and elsewhere require
2077          * this lock to be held even if it's not always necessary. Let's be
2078          * conservative and hold it early. The window can be reduced after
2079          * careful review of the code.
2080          */
2081         reiserfs_write_lock(s);
2082
2083         if (root_inode->i_state & I_NEW) {
2084                 reiserfs_read_locked_inode(root_inode, &args);
2085                 unlock_new_inode(root_inode);
2086         }
2087
2088         if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
2089             !root_inode->i_size) {
2090                 SWARN(silent, s, "", "corrupt root inode, run fsck");
2091                 iput(root_inode);
2092                 errval = -EUCLEAN;
2093                 goto error;
2094         }
2095
2096         s->s_root = d_make_root(root_inode);
2097         if (!s->s_root)
2098                 goto error;
2099         /* define and initialize hash function */
2100         sbi->s_hash_function = hash_function(s);
2101         if (sbi->s_hash_function == NULL) {
2102                 dput(s->s_root);
2103                 s->s_root = NULL;
2104                 goto error;
2105         }
2106
2107         if (is_reiserfs_3_5(rs)
2108             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2109                 set_bit(REISERFS_3_5, &sbi->s_properties);
2110         else if (old_format)
2111                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2112         else
2113                 set_bit(REISERFS_3_6, &sbi->s_properties);
2114
2115         if (!sb_rdonly(s)) {
2116
2117                 errval = journal_begin(&th, s, 1);
2118                 if (errval) {
2119                         dput(s->s_root);
2120                         s->s_root = NULL;
2121                         goto error;
2122                 }
2123                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2124
2125                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2126                 set_sb_fs_state(rs, 0);
2127
2128                 /*
2129                  * Clear out s_bmap_nr if it would wrap. We can handle this
2130                  * case, but older revisions can't. This will cause the
2131                  * file system to fail mount on those older implementations,
2132                  * avoiding corruption. -jeffm
2133                  */
2134                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2135                     sb_bmap_nr(rs) != 0) {
2136                         reiserfs_warning(s, "super-2030", "This file system "
2137                                         "claims to use %u bitmap blocks in "
2138                                         "its super block, but requires %u. "
2139                                         "Clearing to zero.", sb_bmap_nr(rs),
2140                                         reiserfs_bmap_count(s));
2141
2142                         set_sb_bmap_nr(rs, 0);
2143                 }
2144
2145                 if (old_format_only(s)) {
2146                         /*
2147                          * filesystem of format 3.5 either with standard
2148                          * or non-standard journal
2149                          */
2150                         if (convert_reiserfs(s)) {
2151                                 /* and -o conv is given */
2152                                 if (!silent)
2153                                         reiserfs_info(s,
2154                                                       "converting 3.5 filesystem to the 3.6 format");
2155
2156                                 if (is_reiserfs_3_5(rs))
2157                                         /*
2158                                          * put magic string of 3.6 format.
2159                                          * 2.2 will not be able to
2160                                          * mount this filesystem anymore
2161                                          */
2162                                         memcpy(rs->s_v1.s_magic,
2163                                                reiserfs_3_6_magic_string,
2164                                                sizeof
2165                                                (reiserfs_3_6_magic_string));
2166
2167                                 set_sb_version(rs, REISERFS_VERSION_2);
2168                                 reiserfs_convert_objectid_map_v1(s);
2169                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2170                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2171                         } else if (!silent) {
2172                                 reiserfs_info(s, "using 3.5.x disk format\n");
2173                         }
2174                 } else
2175                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2176
2177
2178                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2179                 errval = journal_end(&th);
2180                 if (errval) {
2181                         dput(s->s_root);
2182                         s->s_root = NULL;
2183                         goto error;
2184                 }
2185
2186                 reiserfs_write_unlock(s);
2187                 if ((errval = reiserfs_lookup_privroot(s)) ||
2188                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2189                         dput(s->s_root);
2190                         s->s_root = NULL;
2191                         goto error_unlocked;
2192                 }
2193                 reiserfs_write_lock(s);
2194
2195                 /*
2196                  * look for files which were to be removed in previous session
2197                  */
2198                 finish_unfinished(s);
2199         } else {
2200                 if (old_format_only(s) && !silent) {
2201                         reiserfs_info(s, "using 3.5.x disk format\n");
2202                 }
2203
2204                 reiserfs_write_unlock(s);
2205                 if ((errval = reiserfs_lookup_privroot(s)) ||
2206                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2207                         dput(s->s_root);
2208                         s->s_root = NULL;
2209                         goto error_unlocked;
2210                 }
2211                 reiserfs_write_lock(s);
2212         }
2213         /*
2214          * mark hash in super block: it could be unset. overwrite should be ok
2215          */
2216         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2217
2218         handle_attrs(s);
2219
2220         reiserfs_proc_info_init(s);
2221
2222         init_waitqueue_head(&(sbi->s_wait));
2223         spin_lock_init(&sbi->bitmap_lock);
2224
2225         reiserfs_write_unlock(s);
2226
2227         return (0);
2228
2229 error:
2230         reiserfs_write_unlock(s);
2231
2232 error_unlocked:
2233         /* kill the commit thread, free journal ram */
2234         if (jinit_done) {
2235                 reiserfs_write_lock(s);
2236                 journal_release_error(NULL, s);
2237                 reiserfs_write_unlock(s);
2238         }
2239
2240         if (sbi->commit_wq)
2241                 destroy_workqueue(sbi->commit_wq);
2242
2243         reiserfs_cancel_old_flush(s);
2244
2245         reiserfs_free_bitmap_cache(s);
2246         if (SB_BUFFER_WITH_SB(s))
2247                 brelse(SB_BUFFER_WITH_SB(s));
2248 #ifdef CONFIG_QUOTA
2249         {
2250                 int j;
2251                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2252                         kfree(qf_names[j]);
2253         }
2254 #endif
2255         kfree(sbi->s_jdev);
2256         kfree(sbi);
2257
2258         s->s_fs_info = NULL;
2259         return errval;
2260 }
2261
2262 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2263 {
2264         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2265
2266         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2267         buf->f_bfree = sb_free_blocks(rs);
2268         buf->f_bavail = buf->f_bfree;
2269         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2270         buf->f_bsize = dentry->d_sb->s_blocksize;
2271         /* changed to accommodate gcc folks. */
2272         buf->f_type = REISERFS_SUPER_MAGIC;
2273         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2274         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2275                                 sizeof(rs->s_uuid)/2);
2276
2277         return 0;
2278 }
2279
2280 #ifdef CONFIG_QUOTA
2281 static int reiserfs_write_dquot(struct dquot *dquot)
2282 {
2283         struct reiserfs_transaction_handle th;
2284         int ret, err;
2285         int depth;
2286
2287         reiserfs_write_lock(dquot->dq_sb);
2288         ret =
2289             journal_begin(&th, dquot->dq_sb,
2290                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2291         if (ret)
2292                 goto out;
2293         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2294         ret = dquot_commit(dquot);
2295         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2296         err = journal_end(&th);
2297         if (!ret && err)
2298                 ret = err;
2299 out:
2300         reiserfs_write_unlock(dquot->dq_sb);
2301         return ret;
2302 }
2303
2304 static int reiserfs_acquire_dquot(struct dquot *dquot)
2305 {
2306         struct reiserfs_transaction_handle th;
2307         int ret, err;
2308         int depth;
2309
2310         reiserfs_write_lock(dquot->dq_sb);
2311         ret =
2312             journal_begin(&th, dquot->dq_sb,
2313                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2314         if (ret)
2315                 goto out;
2316         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2317         ret = dquot_acquire(dquot);
2318         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2319         err = journal_end(&th);
2320         if (!ret && err)
2321                 ret = err;
2322 out:
2323         reiserfs_write_unlock(dquot->dq_sb);
2324         return ret;
2325 }
2326
2327 static int reiserfs_release_dquot(struct dquot *dquot)
2328 {
2329         struct reiserfs_transaction_handle th;
2330         int ret, err;
2331
2332         reiserfs_write_lock(dquot->dq_sb);
2333         ret =
2334             journal_begin(&th, dquot->dq_sb,
2335                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2336         reiserfs_write_unlock(dquot->dq_sb);
2337         if (ret) {
2338                 /* Release dquot anyway to avoid endless cycle in dqput() */
2339                 dquot_release(dquot);
2340                 goto out;
2341         }
2342         ret = dquot_release(dquot);
2343         reiserfs_write_lock(dquot->dq_sb);
2344         err = journal_end(&th);
2345         if (!ret && err)
2346                 ret = err;
2347         reiserfs_write_unlock(dquot->dq_sb);
2348 out:
2349         return ret;
2350 }
2351
2352 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2353 {
2354         /* Are we journaling quotas? */
2355         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2356             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2357                 dquot_mark_dquot_dirty(dquot);
2358                 return reiserfs_write_dquot(dquot);
2359         } else
2360                 return dquot_mark_dquot_dirty(dquot);
2361 }
2362
2363 static int reiserfs_write_info(struct super_block *sb, int type)
2364 {
2365         struct reiserfs_transaction_handle th;
2366         int ret, err;
2367         int depth;
2368
2369         /* Data block + inode block */
2370         reiserfs_write_lock(sb);
2371         ret = journal_begin(&th, sb, 2);
2372         if (ret)
2373                 goto out;
2374         depth = reiserfs_write_unlock_nested(sb);
2375         ret = dquot_commit_info(sb, type);
2376         reiserfs_write_lock_nested(sb, depth);
2377         err = journal_end(&th);
2378         if (!ret && err)
2379                 ret = err;
2380 out:
2381         reiserfs_write_unlock(sb);
2382         return ret;
2383 }
2384
2385 /*
2386  * Turn on quotas during mount time - we need to find the quota file and such...
2387  */
2388 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2389 {
2390         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2391                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2392 }
2393
2394 /*
2395  * Standard function to be called on quota_on
2396  */
2397 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2398                              const struct path *path)
2399 {
2400         int err;
2401         struct inode *inode;
2402         struct reiserfs_transaction_handle th;
2403         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2404
2405         reiserfs_write_lock(sb);
2406         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2407                 err = -EINVAL;
2408                 goto out;
2409         }
2410
2411         /* Quotafile not on the same filesystem? */
2412         if (path->dentry->d_sb != sb) {
2413                 err = -EXDEV;
2414                 goto out;
2415         }
2416         inode = d_inode(path->dentry);
2417         /*
2418          * We must not pack tails for quota files on reiserfs for quota
2419          * IO to work
2420          */
2421         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2422                 err = reiserfs_unpack(inode, NULL);
2423                 if (err) {
2424                         reiserfs_warning(sb, "super-6520",
2425                                 "Unpacking tail of quota file failed"
2426                                 " (%d). Cannot turn on quotas.", err);
2427                         err = -EINVAL;
2428                         goto out;
2429                 }
2430                 mark_inode_dirty(inode);
2431         }
2432         /* Journaling quota? */
2433         if (REISERFS_SB(sb)->s_qf_names[type]) {
2434                 /* Quotafile not of fs root? */
2435                 if (path->dentry->d_parent != sb->s_root)
2436                         reiserfs_warning(sb, "super-6521",
2437                                  "Quota file not on filesystem root. "
2438                                  "Journalled quota will not work.");
2439         }
2440
2441         /*
2442          * When we journal data on quota file, we have to flush journal to see
2443          * all updates to the file when we bypass pagecache...
2444          */
2445         if (reiserfs_file_data_log(inode)) {
2446                 /* Just start temporary transaction and finish it */
2447                 err = journal_begin(&th, sb, 1);
2448                 if (err)
2449                         goto out;
2450                 err = journal_end_sync(&th);
2451                 if (err)
2452                         goto out;
2453         }
2454         reiserfs_write_unlock(sb);
2455         err = dquot_quota_on(sb, type, format_id, path);
2456         if (!err) {
2457                 inode_lock(inode);
2458                 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2459                                               REISERFS_NOATIME_FL;
2460                 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2461                                 S_IMMUTABLE | S_NOATIME);
2462                 inode_unlock(inode);
2463                 mark_inode_dirty(inode);
2464         }
2465         return err;
2466 out:
2467         reiserfs_write_unlock(sb);
2468         return err;
2469 }
2470
2471 static int reiserfs_quota_off(struct super_block *sb, int type)
2472 {
2473         int err;
2474         struct inode *inode = sb_dqopt(sb)->files[type];
2475
2476         if (!inode || !igrab(inode))
2477                 goto out;
2478
2479         err = dquot_quota_off(sb, type);
2480         if (err)
2481                 goto out_put;
2482
2483         inode_lock(inode);
2484         REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2485                                         REISERFS_NOATIME_FL);
2486         inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2487         inode_unlock(inode);
2488         mark_inode_dirty(inode);
2489 out_put:
2490         iput(inode);
2491         return err;
2492 out:
2493         return dquot_quota_off(sb, type);
2494 }
2495
2496 /*
2497  * Read data from quotafile - avoid pagecache and such because we cannot afford
2498  * acquiring the locks... As quota files are never truncated and quota code
2499  * itself serializes the operations (and no one else should touch the files)
2500  * we don't have to be afraid of races
2501  */
2502 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2503                                    size_t len, loff_t off)
2504 {
2505         struct inode *inode = sb_dqopt(sb)->files[type];
2506         unsigned long blk = off >> sb->s_blocksize_bits;
2507         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2508         size_t toread;
2509         struct buffer_head tmp_bh, *bh;
2510         loff_t i_size = i_size_read(inode);
2511
2512         if (off > i_size)
2513                 return 0;
2514         if (off + len > i_size)
2515                 len = i_size - off;
2516         toread = len;
2517         while (toread > 0) {
2518                 tocopy =
2519                     sb->s_blocksize - offset <
2520                     toread ? sb->s_blocksize - offset : toread;
2521                 tmp_bh.b_state = 0;
2522                 /*
2523                  * Quota files are without tails so we can safely
2524                  * use this function
2525                  */
2526                 reiserfs_write_lock(sb);
2527                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2528                 reiserfs_write_unlock(sb);
2529                 if (err)
2530                         return err;
2531                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2532                         memset(data, 0, tocopy);
2533                 else {
2534                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2535                         if (!bh)
2536                                 return -EIO;
2537                         memcpy(data, bh->b_data + offset, tocopy);
2538                         brelse(bh);
2539                 }
2540                 offset = 0;
2541                 toread -= tocopy;
2542                 data += tocopy;
2543                 blk++;
2544         }
2545         return len;
2546 }
2547
2548 /*
2549  * Write to quotafile (we know the transaction is already started and has
2550  * enough credits)
2551  */
2552 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2553                                     const char *data, size_t len, loff_t off)
2554 {
2555         struct inode *inode = sb_dqopt(sb)->files[type];
2556         unsigned long blk = off >> sb->s_blocksize_bits;
2557         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2558         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2559         size_t towrite = len;
2560         struct buffer_head tmp_bh, *bh;
2561
2562         if (!current->journal_info) {
2563                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2564                         (unsigned long long)off, (unsigned long long)len);
2565                 return -EIO;
2566         }
2567         while (towrite > 0) {
2568                 tocopy = sb->s_blocksize - offset < towrite ?
2569                     sb->s_blocksize - offset : towrite;
2570                 tmp_bh.b_state = 0;
2571                 reiserfs_write_lock(sb);
2572                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2573                 reiserfs_write_unlock(sb);
2574                 if (err)
2575                         goto out;
2576                 if (offset || tocopy != sb->s_blocksize)
2577                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2578                 else
2579                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2580                 if (!bh) {
2581                         err = -EIO;
2582                         goto out;
2583                 }
2584                 lock_buffer(bh);
2585                 memcpy(bh->b_data + offset, data, tocopy);
2586                 flush_dcache_page(bh->b_page);
2587                 set_buffer_uptodate(bh);
2588                 unlock_buffer(bh);
2589                 reiserfs_write_lock(sb);
2590                 reiserfs_prepare_for_journal(sb, bh, 1);
2591                 journal_mark_dirty(current->journal_info, bh);
2592                 if (!journal_quota)
2593                         reiserfs_add_ordered_list(inode, bh);
2594                 reiserfs_write_unlock(sb);
2595                 brelse(bh);
2596                 offset = 0;
2597                 towrite -= tocopy;
2598                 data += tocopy;
2599                 blk++;
2600         }
2601 out:
2602         if (len == towrite)
2603                 return err;
2604         if (inode->i_size < off + len - towrite)
2605                 i_size_write(inode, off + len - towrite);
2606         inode->i_mtime = inode->i_ctime = current_time(inode);
2607         mark_inode_dirty(inode);
2608         return len - towrite;
2609 }
2610
2611 #endif
2612
2613 static struct dentry *get_super_block(struct file_system_type *fs_type,
2614                            int flags, const char *dev_name,
2615                            void *data)
2616 {
2617         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2618 }
2619
2620 static int __init init_reiserfs_fs(void)
2621 {
2622         int ret;
2623
2624         ret = init_inodecache();
2625         if (ret)
2626                 return ret;
2627
2628         reiserfs_proc_info_global_init();
2629
2630         ret = register_filesystem(&reiserfs_fs_type);
2631         if (ret)
2632                 goto out;
2633
2634         return 0;
2635 out:
2636         reiserfs_proc_info_global_done();
2637         destroy_inodecache();
2638
2639         return ret;
2640 }
2641
2642 static void __exit exit_reiserfs_fs(void)
2643 {
2644         reiserfs_proc_info_global_done();
2645         unregister_filesystem(&reiserfs_fs_type);
2646         destroy_inodecache();
2647 }
2648
2649 struct file_system_type reiserfs_fs_type = {
2650         .owner = THIS_MODULE,
2651         .name = "reiserfs",
2652         .mount = get_super_block,
2653         .kill_sb = reiserfs_kill_sb,
2654         .fs_flags = FS_REQUIRES_DEV,
2655 };
2656 MODULE_ALIAS_FS("reiserfs");
2657
2658 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2659 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2660 MODULE_LICENSE("GPL");
2661
2662 module_init(init_reiserfs_fs);
2663 module_exit(exit_reiserfs_fs);