fs/reiserfs/super.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to add the LFS fixes
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/time.h>
  18 #include <linux/uaccess.h>
  19 #include "reiserfs.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include <linux/init.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/backing-dev.h>
  25 #include <linux/buffer_head.h>
  26 #include <linux/exportfs.h>
  27 #include <linux/quotaops.h>
  28 #include <linux/vfs.h>
  29 #include <linux/mount.h>
  30 #include <linux/namei.h>
  31 #include <linux/crc32.h>
  32 #include <linux/seq_file.h>
  33
  34 struct file_system_type reiserfs_fs_type;
  35
  36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  39
  40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  41 {
  42         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  43                         strlen(reiserfs_3_5_magic_string));
  44 }
  45
  46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  47 {
  48         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  49                         strlen(reiserfs_3_6_magic_string));
  50 }
  51
  52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
  53 {
  54         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  55                         strlen(reiserfs_jr_magic_string));
  56 }
  57
  58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  59 {
  60         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  61                 is_reiserfs_jr(rs));
  62 }
  63
  64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  66
  67 static int reiserfs_sync_fs(struct super_block *s, int wait)
  68 {
  69         struct reiserfs_transaction_handle th;
  70
  71         /*
  72          * Writeback quota in non-journalled quota case - journalled quota has
  73          * no dirty dquots
  74          */
  75         dquot_writeback_dquots(s, -1);
  76         reiserfs_write_lock(s);
  77         if (!journal_begin(&th, s, 1))
  78                 if (!journal_end_sync(&th))
  79                         reiserfs_flush_old_commits(s);
  80         reiserfs_write_unlock(s);
  81         return 0;
  82 }
  83
  84 static void flush_old_commits(struct work_struct *work)
  85 {
  86         struct reiserfs_sb_info *sbi;
  87         struct super_block *s;
  88
  89         sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90         s = sbi->s_journal->j_work_sb;
  91
  92         spin_lock(&sbi->old_work_lock);
  93         /* Avoid clobbering the cancel state... */
  94         if (sbi->work_queued == 1)
  95                 sbi->work_queued = 0;
  96         spin_unlock(&sbi->old_work_lock);
  97
  98         reiserfs_sync_fs(s, 1);
  99 }
 100
 101 void reiserfs_schedule_old_flush(struct super_block *s)
 102 {
 103         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 104         unsigned long delay;
 105
 106         /*
 107          * Avoid scheduling flush when sb is being shut down. It can race
 108          * with journal shutdown and free still queued delayed work.
 109          */
 110         if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
 111                 return;
 112
 113         spin_lock(&sbi->old_work_lock);
 114         if (!sbi->work_queued) {
 115                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 116                 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 117                 sbi->work_queued = 1;
 118         }
 119         spin_unlock(&sbi->old_work_lock);
 120 }
 121
 122 void reiserfs_cancel_old_flush(struct super_block *s)
 123 {
 124         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 125
 126         spin_lock(&sbi->old_work_lock);
 127         /* Make sure no new flushes will be queued */
 128         sbi->work_queued = 2;
 129         spin_unlock(&sbi->old_work_lock);
 130         cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 131 }
 132
 133 static int reiserfs_freeze(struct super_block *s)
 134 {
 135         struct reiserfs_transaction_handle th;
 136
 137         reiserfs_cancel_old_flush(s);
 138
 139         reiserfs_write_lock(s);
 140         if (!(s->s_flags & MS_RDONLY)) {
 141                 int err = journal_begin(&th, s, 1);
 142                 if (err) {
 143                         reiserfs_block_writes(&th);
 144                 } else {
 145                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 146                                                      1);
 147                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 148                         reiserfs_block_writes(&th);
 149                         journal_end_sync(&th);
 150                 }
 151         }
 152         reiserfs_write_unlock(s);
 153         return 0;
 154 }
 155
 156 static int reiserfs_unfreeze(struct super_block *s)
 157 {
 158         struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 159
 160         reiserfs_allow_writes(s);
 161         spin_lock(&sbi->old_work_lock);
 162         /* Allow old_work to run again */
 163         sbi->work_queued = 0;
 164         spin_unlock(&sbi->old_work_lock);
 165         return 0;
 166 }
 167
 168 extern const struct in_core_key MAX_IN_CORE_KEY;
 169
 170 /*
 171  * this is used to delete "save link" when there are no items of a
 172  * file it points to. It can either happen if unlink is completed but
 173  * "save unlink" removal, or if file has both unlink and truncate
 174  * pending and as unlink completes first (because key of "save link"
 175  * protecting unlink is bigger that a key lf "save link" which
 176  * protects truncate), so there left no items to make truncate
 177  * completion on
 178  */
 179 static int remove_save_link_only(struct super_block *s,
 180                                  struct reiserfs_key *key, int oid_free)
 181 {
 182         struct reiserfs_transaction_handle th;
 183         int err;
 184
 185         /* we are going to do one balancing */
 186         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 187         if (err)
 188                 return err;
 189
 190         reiserfs_delete_solid_item(&th, NULL, key);
 191         if (oid_free)
 192                 /* removals are protected by direct items */
 193                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 194
 195         return journal_end(&th);
 196 }
 197
 198 #ifdef CONFIG_QUOTA
 199 static int reiserfs_quota_on_mount(struct super_block *, int);
 200 #endif
 201
 202 /*
 203  * Look for uncompleted unlinks and truncates and complete them
 204  *
 205  * Called with superblock write locked.  If quotas are enabled, we have to
 206  * release/retake lest we call dquot_quota_on_mount(), proceed to
 207  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
 208  * cpu worklets to complete flush_async_commits() that in turn wait for the
 209  * superblock write lock.
 210  */
 211 static int finish_unfinished(struct super_block *s)
 212 {
 213         INITIALIZE_PATH(path);
 214         struct cpu_key max_cpu_key, obj_key;
 215         struct reiserfs_key save_link_key, last_inode_key;
 216         int retval = 0;
 217         struct item_head *ih;
 218         struct buffer_head *bh;
 219         int item_pos;
 220         char *item;
 221         int done;
 222         struct inode *inode;
 223         int truncate;
 224 #ifdef CONFIG_QUOTA
 225         int i;
 226         int ms_active_set;
 227         int quota_enabled[REISERFS_MAXQUOTAS];
 228 #endif
 229
 230         /* compose key to look for "save" links */
 231         max_cpu_key.version = KEY_FORMAT_3_5;
 232         max_cpu_key.on_disk_key.k_dir_id = ~0U;
 233         max_cpu_key.on_disk_key.k_objectid = ~0U;
 234         set_cpu_key_k_offset(&max_cpu_key, ~0U);
 235         max_cpu_key.key_length = 3;
 236
 237         memset(&last_inode_key, 0, sizeof(last_inode_key));
 238
 239 #ifdef CONFIG_QUOTA
 240         /* Needed for iput() to work correctly and not trash data */
 241         if (s->s_flags & MS_ACTIVE) {
 242                 ms_active_set = 0;
 243         } else {
 244                 ms_active_set = 1;
 245                 s->s_flags |= MS_ACTIVE;
 246         }
 247         /* Turn on quotas so that they are updated correctly */
 248         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 249                 quota_enabled[i] = 1;
 250                 if (REISERFS_SB(s)->s_qf_names[i]) {
 251                         int ret;
 252
 253                         if (sb_has_quota_active(s, i)) {
 254                                 quota_enabled[i] = 0;
 255                                 continue;
 256                         }
 257                         reiserfs_write_unlock(s);
 258                         ret = reiserfs_quota_on_mount(s, i);
 259                         reiserfs_write_lock(s);
 260                         if (ret < 0)
 261                                 reiserfs_warning(s, "reiserfs-2500",
 262                                                  "cannot turn on journaled "
 263                                                  "quota: error %d", ret);
 264                 }
 265         }
 266 #endif
 267
 268         done = 0;
 269         REISERFS_SB(s)->s_is_unlinked_ok = 1;
 270         while (!retval) {
 271                 int depth;
 272                 retval = search_item(s, &max_cpu_key, &path);
 273                 if (retval != ITEM_NOT_FOUND) {
 274                         reiserfs_error(s, "vs-2140",
 275                                        "search_by_key returned %d", retval);
 276                         break;
 277                 }
 278
 279                 bh = get_last_bh(&path);
 280                 item_pos = get_item_pos(&path);
 281                 if (item_pos != B_NR_ITEMS(bh)) {
 282                         reiserfs_warning(s, "vs-2060",
 283                                          "wrong position found");
 284                         break;
 285                 }
 286                 item_pos--;
 287                 ih = item_head(bh, item_pos);
 288
 289                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 290                         /* there are no "save" links anymore */
 291                         break;
 292
 293                 save_link_key = ih->ih_key;
 294                 if (is_indirect_le_ih(ih))
 295                         truncate = 1;
 296                 else
 297                         truncate = 0;
 298
 299                 /* reiserfs_iget needs k_dirid and k_objectid only */
 300                 item = ih_item_body(bh, ih);
 301                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 302                 obj_key.on_disk_key.k_objectid =
 303                     le32_to_cpu(ih->ih_key.k_objectid);
 304                 obj_key.on_disk_key.k_offset = 0;
 305                 obj_key.on_disk_key.k_type = 0;
 306
 307                 pathrelse(&path);
 308
 309                 inode = reiserfs_iget(s, &obj_key);
 310                 if (IS_ERR_OR_NULL(inode)) {
 311                         /*
 312                          * the unlink almost completed, it just did not
 313                          * manage to remove "save" link and release objectid
 314                          */
 315                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
 316                                          &obj_key);
 317                         retval = remove_save_link_only(s, &save_link_key, 1);
 318                         continue;
 319                 }
 320
 321                 if (!truncate && inode->i_nlink) {
 322                         /* file is not unlinked */
 323                         reiserfs_warning(s, "vs-2185",
 324                                          "file %K is not unlinked",
 325                                          &obj_key);
 326                         retval = remove_save_link_only(s, &save_link_key, 0);
 327                         continue;
 328                 }
 329                 depth = reiserfs_write_unlock_nested(inode->i_sb);
 330                 dquot_initialize(inode);
 331                 reiserfs_write_lock_nested(inode->i_sb, depth);
 332
 333                 if (truncate && S_ISDIR(inode->i_mode)) {
 334                         /*
 335                          * We got a truncate request for a dir which
 336                          * is impossible.  The only imaginable way is to
 337                          * execute unfinished truncate request then boot
 338                          * into old kernel, remove the file and create dir
 339                          * with the same key.
 340                          */
 341                         reiserfs_warning(s, "green-2101",
 342                                          "impossible truncate on a "
 343                                          "directory %k. Please report",
 344                                          INODE_PKEY(inode));
 345                         retval = remove_save_link_only(s, &save_link_key, 0);
 346                         truncate = 0;
 347                         iput(inode);
 348                         continue;
 349                 }
 350
 351                 if (truncate) {
 352                         REISERFS_I(inode)->i_flags |=
 353                             i_link_saved_truncate_mask;
 354                         /*
 355                          * not completed truncate found. New size was
 356                          * committed together with "save" link
 357                          */
 358                         reiserfs_info(s, "Truncating %k to %lld ..",
 359                                       INODE_PKEY(inode), inode->i_size);
 360
 361                         /* don't update modification time */
 362                         reiserfs_truncate_file(inode, 0);
 363
 364                         retval = remove_save_link(inode, truncate);
 365                 } else {
 366                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 367                         /* not completed unlink (rmdir) found */
 368                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 369                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
 370                                         sizeof(last_inode_key))){
 371                                 last_inode_key = *INODE_PKEY(inode);
 372                                 /* removal gets completed in iput */
 373                                 retval = 0;
 374                         } else {
 375                                 reiserfs_warning(s, "super-2189", "Dead loop "
 376                                                  "in finish_unfinished "
 377                                                  "detected, just remove "
 378                                                  "save link\n");
 379                                 retval = remove_save_link_only(s,
 380                                                         &save_link_key, 0);
 381                         }
 382                 }
 383
 384                 iput(inode);
 385                 printk("done\n");
 386                 done++;
 387         }
 388         REISERFS_SB(s)->s_is_unlinked_ok = 0;
 389
 390 #ifdef CONFIG_QUOTA
 391         /* Turn quotas off */
 392         reiserfs_write_unlock(s);
 393         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
 394                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
 395                         dquot_quota_off(s, i);
 396         }
 397         reiserfs_write_lock(s);
 398         if (ms_active_set)
 399                 /* Restore the flag back */
 400                 s->s_flags &= ~MS_ACTIVE;
 401 #endif
 402         pathrelse(&path);
 403         if (done)
 404                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 405                               "Completed\n", done);
 406         return retval;
 407 }
 408
 409 /*
 410  * to protect file being unlinked from getting lost we "safe" link files
 411  * being unlinked. This link will be deleted in the same transaction with last
 412  * item of file. mounting the filesystem we scan all these links and remove
 413  * files which almost got lost
 414  */
 415 void add_save_link(struct reiserfs_transaction_handle *th,
 416                    struct inode *inode, int truncate)
 417 {
 418         INITIALIZE_PATH(path);
 419         int retval;
 420         struct cpu_key key;
 421         struct item_head ih;
 422         __le32 link;
 423
 424         BUG_ON(!th->t_trans_id);
 425
 426         /* file can only get one "save link" of each kind */
 427         RFALSE(truncate &&
 428                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 429                "saved link already exists for truncated inode %lx",
 430                (long)inode->i_ino);
 431         RFALSE(!truncate &&
 432                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 433                "saved link already exists for unlinked inode %lx",
 434                (long)inode->i_ino);
 435
 436         /* setup key of "save" link */
 437         key.version = KEY_FORMAT_3_5;
 438         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 439         key.on_disk_key.k_objectid = inode->i_ino;
 440         if (!truncate) {
 441                 /* unlink, rmdir, rename */
 442                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 443                 set_cpu_key_k_type(&key, TYPE_DIRECT);
 444
 445                 /* item head of "safe" link */
 446                 make_le_item_head(&ih, &key, key.version,
 447                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 448                                   4 /*length */ , 0xffff /*free space */ );
 449         } else {
 450                 /* truncate */
 451                 if (S_ISDIR(inode->i_mode))
 452                         reiserfs_warning(inode->i_sb, "green-2102",
 453                                          "Adding a truncate savelink for "
 454                                          "a directory %k! Please report",
 455                                          INODE_PKEY(inode));
 456                 set_cpu_key_k_offset(&key, 1);
 457                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
 458
 459                 /* item head of "safe" link */
 460                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 461                                   4 /*length */ , 0 /*free space */ );
 462         }
 463         key.key_length = 3;
 464
 465         /* look for its place in the tree */
 466         retval = search_item(inode->i_sb, &key, &path);
 467         if (retval != ITEM_NOT_FOUND) {
 468                 if (retval != -ENOSPC)
 469                         reiserfs_error(inode->i_sb, "vs-2100",
 470                                        "search_by_key (%K) returned %d", &key,
 471                                        retval);
 472                 pathrelse(&path);
 473                 return;
 474         }
 475
 476         /* body of "save" link */
 477         link = INODE_PKEY(inode)->k_dir_id;
 478
 479         /* put "save" link into tree, don't charge quota to anyone */
 480         retval =
 481             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 482         if (retval) {
 483                 if (retval != -ENOSPC)
 484                         reiserfs_error(inode->i_sb, "vs-2120",
 485                                        "insert_item returned %d", retval);
 486         } else {
 487                 if (truncate)
 488                         REISERFS_I(inode)->i_flags |=
 489                             i_link_saved_truncate_mask;
 490                 else
 491                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 492         }
 493 }
 494
 495 /* this opens transaction unlike add_save_link */
 496 int remove_save_link(struct inode *inode, int truncate)
 497 {
 498         struct reiserfs_transaction_handle th;
 499         struct reiserfs_key key;
 500         int err;
 501
 502         /* we are going to do one balancing only */
 503         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 504         if (err)
 505                 return err;
 506
 507         /* setup key of "save" link */
 508         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 509         key.k_objectid = INODE_PKEY(inode)->k_objectid;
 510         if (!truncate) {
 511                 /* unlink, rmdir, rename */
 512                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 513                                     1 + inode->i_sb->s_blocksize);
 514                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 515         } else {
 516                 /* truncate */
 517                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 518                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 519         }
 520
 521         if ((truncate &&
 522              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 523             (!truncate &&
 524              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 525                 /* don't take quota bytes from anywhere */
 526                 reiserfs_delete_solid_item(&th, NULL, &key);
 527         if (!truncate) {
 528                 reiserfs_release_objectid(&th, inode->i_ino);
 529                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 530         } else
 531                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 532
 533         return journal_end(&th);
 534 }
 535
 536 static void reiserfs_kill_sb(struct super_block *s)
 537 {
 538         if (REISERFS_SB(s)) {
 539                 reiserfs_proc_info_done(s);
 540                 /*
 541                  * Force any pending inode evictions to occur now. Any
 542                  * inodes to be removed that have extended attributes
 543                  * associated with them need to clean them up before
 544                  * we can release the extended attribute root dentries.
 545                  * shrink_dcache_for_umount will BUG if we don't release
 546                  * those before it's called so ->put_super is too late.
 547                  */
 548                 shrink_dcache_sb(s);
 549
 550                 dput(REISERFS_SB(s)->xattr_root);
 551                 REISERFS_SB(s)->xattr_root = NULL;
 552                 dput(REISERFS_SB(s)->priv_root);
 553                 REISERFS_SB(s)->priv_root = NULL;
 554         }
 555
 556         kill_block_super(s);
 557 }
 558
 559 static void reiserfs_put_super(struct super_block *s)
 560 {
 561         struct reiserfs_transaction_handle th;
 562         th.t_trans_id = 0;
 563
 564         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 565
 566         reiserfs_write_lock(s);
 567
 568         /*
 569          * change file system state to current state if it was mounted
 570          * with read-write permissions
 571          */
 572         if (!(s->s_flags & MS_RDONLY)) {
 573                 if (!journal_begin(&th, s, 10)) {
 574                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 575                                                      1);
 576                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 577                                             REISERFS_SB(s)->s_mount_state);
 578                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
 579                 }
 580         }
 581
 582         /*
 583          * note, journal_release checks for readonly mount, and can
 584          * decide not to do a journal_end
 585          */
 586         journal_release(&th, s);
 587
 588         reiserfs_free_bitmap_cache(s);
 589
 590         brelse(SB_BUFFER_WITH_SB(s));
 591
 592         print_statistics(s);
 593
 594         if (REISERFS_SB(s)->reserved_blocks != 0) {
 595                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 596                                  REISERFS_SB(s)->reserved_blocks);
 597         }
 598
 599         reiserfs_write_unlock(s);
 600         mutex_destroy(&REISERFS_SB(s)->lock);
 601         destroy_workqueue(REISERFS_SB(s)->commit_wq);
 602         kfree(REISERFS_SB(s)->s_jdev);
 603         kfree(s->s_fs_info);
 604         s->s_fs_info = NULL;
 605 }
 606
 607 static struct kmem_cache *reiserfs_inode_cachep;
 608
 609 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 610 {
 611         struct reiserfs_inode_info *ei;
 612         ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 613         if (!ei)
 614                 return NULL;
 615         atomic_set(&ei->openers, 0);
 616         mutex_init(&ei->tailpack);
 617 #ifdef CONFIG_QUOTA
 618         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 619 #endif
 620
 621         return &ei->vfs_inode;
 622 }
 623
 624 static void reiserfs_i_callback(struct rcu_head *head)
 625 {
 626         struct inode *inode = container_of(head, struct inode, i_rcu);
 627         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 628 }
 629
 630 static void reiserfs_destroy_inode(struct inode *inode)
 631 {
 632         call_rcu(&inode->i_rcu, reiserfs_i_callback);
 633 }
 634
 635 static void init_once(void *foo)
 636 {
 637         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 638
 639         INIT_LIST_HEAD(&ei->i_prealloc_list);
 640         inode_init_once(&ei->vfs_inode);
 641 }
 642
 643 static int __init init_inodecache(void)
 644 {
 645         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 646                                                   sizeof(struct
 647                                                          reiserfs_inode_info),
 648                                                   0, (SLAB_RECLAIM_ACCOUNT|
 649                                                       SLAB_MEM_SPREAD|
 650                                                       SLAB_ACCOUNT),
 651                                                   init_once);
 652         if (reiserfs_inode_cachep == NULL)
 653                 return -ENOMEM;
 654         return 0;
 655 }
 656
 657 static void destroy_inodecache(void)
 658 {
 659         /*
 660          * Make sure all delayed rcu free inodes are flushed before we
 661          * destroy cache.
 662          */
 663         rcu_barrier();
 664         kmem_cache_destroy(reiserfs_inode_cachep);
 665 }
 666
 667 /* we don't mark inodes dirty, we just log them */
 668 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 669 {
 670         struct reiserfs_transaction_handle th;
 671
 672         int err = 0;
 673
 674         if (inode->i_sb->s_flags & MS_RDONLY) {
 675                 reiserfs_warning(inode->i_sb, "clm-6006",
 676                                  "writing inode %lu on readonly FS",
 677                                  inode->i_ino);
 678                 return;
 679         }
 680         reiserfs_write_lock(inode->i_sb);
 681
 682         /*
 683          * this is really only used for atime updates, so they don't have
 684          * to be included in O_SYNC or fsync
 685          */
 686         err = journal_begin(&th, inode->i_sb, 1);
 687         if (err)
 688                 goto out;
 689
 690         reiserfs_update_sd(&th, inode);
 691         journal_end(&th);
 692
 693 out:
 694         reiserfs_write_unlock(inode->i_sb);
 695 }
 696
 697 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 698 {
 699         struct super_block *s = root->d_sb;
 700         struct reiserfs_journal *journal = SB_JOURNAL(s);
 701         long opts = REISERFS_SB(s)->s_mount_opt;
 702
 703         if (opts & (1 << REISERFS_LARGETAIL))
 704                 seq_puts(seq, ",tails=on");
 705         else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 706                 seq_puts(seq, ",notail");
 707         /* tails=small is default so we don't show it */
 708
 709         if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 710                 seq_puts(seq, ",barrier=none");
 711         /* barrier=flush is default so we don't show it */
 712
 713         if (opts & (1 << REISERFS_ERROR_CONTINUE))
 714                 seq_puts(seq, ",errors=continue");
 715         else if (opts & (1 << REISERFS_ERROR_PANIC))
 716                 seq_puts(seq, ",errors=panic");
 717         /* errors=ro is default so we don't show it */
 718
 719         if (opts & (1 << REISERFS_DATA_LOG))
 720                 seq_puts(seq, ",data=journal");
 721         else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 722                 seq_puts(seq, ",data=writeback");
 723         /* data=ordered is default so we don't show it */
 724
 725         if (opts & (1 << REISERFS_ATTRS))
 726                 seq_puts(seq, ",attrs");
 727
 728         if (opts & (1 << REISERFS_XATTRS_USER))
 729                 seq_puts(seq, ",user_xattr");
 730
 731         if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 732                 seq_puts(seq, ",expose_privroot");
 733
 734         if (opts & (1 << REISERFS_POSIXACL))
 735                 seq_puts(seq, ",acl");
 736
 737         if (REISERFS_SB(s)->s_jdev)
 738                 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 739
 740         if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 741                 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 742
 743 #ifdef CONFIG_QUOTA
 744         if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 745                 seq_show_option(seq, "usrjquota",
 746                                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 747         else if (opts & (1 << REISERFS_USRQUOTA))
 748                 seq_puts(seq, ",usrquota");
 749         if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 750                 seq_show_option(seq, "grpjquota",
 751                                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 752         else if (opts & (1 << REISERFS_GRPQUOTA))
 753                 seq_puts(seq, ",grpquota");
 754         if (REISERFS_SB(s)->s_jquota_fmt) {
 755                 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 756                         seq_puts(seq, ",jqfmt=vfsold");
 757                 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 758                         seq_puts(seq, ",jqfmt=vfsv0");
 759         }
 760 #endif
 761
 762         /* Block allocator options */
 763         if (opts & (1 << REISERFS_NO_BORDER))
 764                 seq_puts(seq, ",block-allocator=noborder");
 765         if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 766                 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 767         if (opts & (1 << REISERFS_HASHED_RELOCATION))
 768                 seq_puts(seq, ",block-allocator=hashed_relocation");
 769         if (opts & (1 << REISERFS_TEST4))
 770                 seq_puts(seq, ",block-allocator=test4");
 771         show_alloc_options(seq, s);
 772         return 0;
 773 }
 774
 775 #ifdef CONFIG_QUOTA
 776 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 777                                     size_t, loff_t);
 778 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 779                                    loff_t);
 780
 781 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 782 {
 783         return REISERFS_I(inode)->i_dquot;
 784 }
 785 #endif
 786
 787 static const struct super_operations reiserfs_sops = {
 788         .alloc_inode = reiserfs_alloc_inode,
 789         .destroy_inode = reiserfs_destroy_inode,
 790         .write_inode = reiserfs_write_inode,
 791         .dirty_inode = reiserfs_dirty_inode,
 792         .evict_inode = reiserfs_evict_inode,
 793         .put_super = reiserfs_put_super,
 794         .sync_fs = reiserfs_sync_fs,
 795         .freeze_fs = reiserfs_freeze,
 796         .unfreeze_fs = reiserfs_unfreeze,
 797         .statfs = reiserfs_statfs,
 798         .remount_fs = reiserfs_remount,
 799         .show_options = reiserfs_show_options,
 800 #ifdef CONFIG_QUOTA
 801         .quota_read = reiserfs_quota_read,
 802         .quota_write = reiserfs_quota_write,
 803         .get_dquots = reiserfs_get_dquots,
 804 #endif
 805 };
 806
 807 #ifdef CONFIG_QUOTA
 808 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 809
 810 static int reiserfs_write_dquot(struct dquot *);
 811 static int reiserfs_acquire_dquot(struct dquot *);
 812 static int reiserfs_release_dquot(struct dquot *);
 813 static int reiserfs_mark_dquot_dirty(struct dquot *);
 814 static int reiserfs_write_info(struct super_block *, int);
 815 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 816
 817 static const struct dquot_operations reiserfs_quota_operations = {
 818         .write_dquot = reiserfs_write_dquot,
 819         .acquire_dquot = reiserfs_acquire_dquot,
 820         .release_dquot = reiserfs_release_dquot,
 821         .mark_dirty = reiserfs_mark_dquot_dirty,
 822         .write_info = reiserfs_write_info,
 823         .alloc_dquot    = dquot_alloc,
 824         .destroy_dquot  = dquot_destroy,
 825         .get_next_id    = dquot_get_next_id,
 826 };
 827
 828 static const struct quotactl_ops reiserfs_qctl_operations = {
 829         .quota_on = reiserfs_quota_on,
 830         .quota_off = dquot_quota_off,
 831         .quota_sync = dquot_quota_sync,
 832         .get_state = dquot_get_state,
 833         .set_info = dquot_set_dqinfo,
 834         .get_dqblk = dquot_get_dqblk,
 835         .set_dqblk = dquot_set_dqblk,
 836 };
 837 #endif
 838
 839 static const struct export_operations reiserfs_export_ops = {
 840         .encode_fh = reiserfs_encode_fh,
 841         .fh_to_dentry = reiserfs_fh_to_dentry,
 842         .fh_to_parent = reiserfs_fh_to_parent,
 843         .get_parent = reiserfs_get_parent,
 844 };
 845
 846 /*
 847  * this struct is used in reiserfs_getopt () for containing the value for
 848  * those mount options that have values rather than being toggles.
 849  */
 850 typedef struct {
 851         char *value;
 852         /*
 853          * bitmask which is to set on mount_options bitmask
 854          * when this value is found, 0 is no bits are to be changed.
 855          */
 856         int setmask;
 857         /*
 858          * bitmask which is to clear on mount_options bitmask
 859          * when this value is found, 0 is no bits are to be changed.
 860          * This is applied BEFORE setmask
 861          */
 862         int clrmask;
 863 } arg_desc_t;
 864
 865 /* Set this bit in arg_required to allow empty arguments */
 866 #define REISERFS_OPT_ALLOWEMPTY 31
 867
 868 /*
 869  * this struct is used in reiserfs_getopt() for describing the
 870  * set of reiserfs mount options
 871  */
 872 typedef struct {
 873         char *option_name;
 874
 875         /* 0 if argument is not required, not 0 otherwise */
 876         int arg_required;
 877
 878         /* list of values accepted by an option */
 879         const arg_desc_t *values;
 880
 881         /*
 882          * bitmask which is to set on mount_options bitmask
 883          * when this value is found, 0 is no bits are to be changed.
 884          */
 885         int setmask;
 886
 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 } opt_desc_t;
 894
 895 /* possible values for -o data= */
 896 static const arg_desc_t logging_mode[] = {
 897         {"ordered", 1 << REISERFS_DATA_ORDERED,
 898          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 899         {"journal", 1 << REISERFS_DATA_LOG,
 900          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 901         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 902          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 903         {.value = NULL}
 904 };
 905
 906 /* possible values for -o barrier= */
 907 static const arg_desc_t barrier_mode[] = {
 908         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 909         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 910         {.value = NULL}
 911 };
 912
 913 /*
 914  * possible values for "-o block-allocator=" and bits which are to be set in
 915  * s_mount_opt of reiserfs specific part of in-core super block
 916  */
 917 static const arg_desc_t balloc[] = {
 918         {"noborder", 1 << REISERFS_NO_BORDER, 0},
 919         {"border", 0, 1 << REISERFS_NO_BORDER},
 920         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 921         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 922         {"test4", 1 << REISERFS_TEST4, 0},
 923         {"notest4", 0, 1 << REISERFS_TEST4},
 924         {NULL, 0, 0}
 925 };
 926
 927 static const arg_desc_t tails[] = {
 928         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 929         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 930         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 931         {NULL, 0, 0}
 932 };
 933
 934 static const arg_desc_t error_actions[] = {
 935         {"panic", 1 << REISERFS_ERROR_PANIC,
 936          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 937         {"ro-remount", 1 << REISERFS_ERROR_RO,
 938          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 939 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 940         {"continue", 1 << REISERFS_ERROR_CONTINUE,
 941          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 942 #endif
 943         {NULL, 0, 0},
 944 };
 945
 946 /*
 947  * proceed only one option from a list *cur - string containing of mount
 948  * options
 949  * opts - array of options which are accepted
 950  * opt_arg - if option is found and requires an argument and if it is specifed
 951  * in the input - pointer to the argument is stored here
 952  * bit_flags - if option requires to set a certain bit - it is set here
 953  * return -1 if unknown option is found, opt->arg_required otherwise
 954  */
 955 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 956                            char **opt_arg, unsigned long *bit_flags)
 957 {
 958         char *p;
 959         /*
 960          * foo=bar,
 961          * ^   ^  ^
 962          * |   |  +-- option_end
 963          * |   +-- arg_start
 964          * +-- option_start
 965          */
 966         const opt_desc_t *opt;
 967         const arg_desc_t *arg;
 968
 969         p = *cur;
 970
 971         /* assume argument cannot contain commas */
 972         *cur = strchr(p, ',');
 973         if (*cur) {
 974                 *(*cur) = '\0';
 975                 (*cur)++;
 976         }
 977
 978         if (!strncmp(p, "alloc=", 6)) {
 979                 /*
 980                  * Ugly special case, probably we should redo options
 981                  * parser so that it can understand several arguments for
 982                  * some options, also so that it can fill several bitfields
 983                  * with option values.
 984                  */
 985                 if (reiserfs_parse_alloc_options(s, p + 6)) {
 986                         return -1;
 987                 } else {
 988                         return 0;
 989                 }
 990         }
 991
 992         /* for every option in the list */
 993         for (opt = opts; opt->option_name; opt++) {
 994                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 995                         if (bit_flags) {
 996                                 if (opt->clrmask ==
 997                                     (1 << REISERFS_UNSUPPORTED_OPT))
 998                                         reiserfs_warning(s, "super-6500",
 999                                                          "%s not supported.\n",
1000                                                          p);
1001                                 else
1002                                         *bit_flags &= ~opt->clrmask;
1003                                 if (opt->setmask ==
1004                                     (1 << REISERFS_UNSUPPORTED_OPT))
1005                                         reiserfs_warning(s, "super-6501",
1006                                                          "%s not supported.\n",
1007                                                          p);
1008                                 else
1009                                         *bit_flags |= opt->setmask;
1010                         }
1011                         break;
1012                 }
1013         }
1014         if (!opt->option_name) {
1015                 reiserfs_warning(s, "super-6502",
1016                                  "unknown mount option \"%s\"", p);
1017                 return -1;
1018         }
1019
1020         p += strlen(opt->option_name);
1021         switch (*p) {
1022         case '=':
1023                 if (!opt->arg_required) {
1024                         reiserfs_warning(s, "super-6503",
1025                                          "the option \"%s\" does not "
1026                                          "require an argument\n",
1027                                          opt->option_name);
1028                         return -1;
1029                 }
1030                 break;
1031
1032         case 0:
1033                 if (opt->arg_required) {
1034                         reiserfs_warning(s, "super-6504",
1035                                          "the option \"%s\" requires an "
1036                                          "argument\n", opt->option_name);
1037                         return -1;
1038                 }
1039                 break;
1040         default:
1041                 reiserfs_warning(s, "super-6505",
1042                                  "head of option \"%s\" is only correct\n",
1043                                  opt->option_name);
1044                 return -1;
1045         }
1046
1047         /*
1048          * move to the argument, or to next option if argument is not
1049          * required
1050          */
1051         p++;
1052
1053         if (opt->arg_required
1054             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1055             && !strlen(p)) {
1056                 /* this catches "option=," if not allowed */
1057                 reiserfs_warning(s, "super-6506",
1058                                  "empty argument for \"%s\"\n",
1059                                  opt->option_name);
1060                 return -1;
1061         }
1062
1063         if (!opt->values) {
1064                 /* *=NULLopt_arg contains pointer to argument */
1065                 *opt_arg = p;
1066                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1067         }
1068
1069         /* values possible for this option are listed in opt->values */
1070         for (arg = opt->values; arg->value; arg++) {
1071                 if (!strcmp(p, arg->value)) {
1072                         if (bit_flags) {
1073                                 *bit_flags &= ~arg->clrmask;
1074                                 *bit_flags |= arg->setmask;
1075                         }
1076                         return opt->arg_required;
1077                 }
1078         }
1079
1080         reiserfs_warning(s, "super-6506",
1081                          "bad value \"%s\" for option \"%s\"\n", p,
1082                          opt->option_name);
1083         return -1;
1084 }
1085
1086 /* returns 0 if something is wrong in option string, 1 - otherwise */
1087 static int reiserfs_parse_options(struct super_block *s,
1088
1089                                   /* string given via mount's -o */
1090                                   char *options,
1091
1092                                   /*
1093                                    * after the parsing phase, contains the
1094                                    * collection of bitflags defining what
1095                                    * mount options were selected.
1096                                    */
1097                                   unsigned long *mount_options,
1098
1099                                   /* strtol-ed from NNN of resize=NNN */
1100                                   unsigned long *blocks,
1101                                   char **jdev_name,
1102                                   unsigned int *commit_max_age,
1103                                   char **qf_names,
1104                                   unsigned int *qfmt)
1105 {
1106         int c;
1107         char *arg = NULL;
1108         char *pos;
1109         opt_desc_t opts[] = {
1110                 /*
1111                  * Compatibility stuff, so that -o notail for old
1112                  * setups still work
1113                  */
1114                 {"tails",.arg_required = 't',.values = tails},
1115                 {"notail",.clrmask =
1116                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1117                 {"conv",.setmask = 1 << REISERFS_CONVERT},
1118                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1119                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1120                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1121 #ifdef CONFIG_REISERFS_FS_XATTR
1122                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1123                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1124 #else
1125                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1126                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1127 #endif
1128 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1129                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1130                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1131 #else
1132                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1133                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1134 #endif
1135                 {.option_name = "nolog"},
1136                 {"replayonly",.setmask = 1 << REPLAYONLY},
1137                 {"block-allocator",.arg_required = 'a',.values = balloc},
1138                 {"data",.arg_required = 'd',.values = logging_mode},
1139                 {"barrier",.arg_required = 'b',.values = barrier_mode},
1140                 {"resize",.arg_required = 'r',.values = NULL},
1141                 {"jdev",.arg_required = 'j',.values = NULL},
1142                 {"nolargeio",.arg_required = 'w',.values = NULL},
1143                 {"commit",.arg_required = 'c',.values = NULL},
1144                 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1145                 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1146                 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1147                 {"errors",.arg_required = 'e',.values = error_actions},
1148                 {"usrjquota",.arg_required =
1149                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1150                 {"grpjquota",.arg_required =
1151                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1152                 {"jqfmt",.arg_required = 'f',.values = NULL},
1153                 {.option_name = NULL}
1154         };
1155
1156         *blocks = 0;
1157         if (!options || !*options)
1158                 /*
1159                  * use default configuration: create tails, journaling on, no
1160                  * conversion to newest format
1161                  */
1162                 return 1;
1163
1164         for (pos = options; pos;) {
1165                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1166                 if (c == -1)
1167                         /* wrong option is given */
1168                         return 0;
1169
1170                 if (c == 'r') {
1171                         char *p;
1172
1173                         p = NULL;
1174                         /* "resize=NNN" or "resize=auto" */
1175
1176                         if (!strcmp(arg, "auto")) {
1177                                 /* From JFS code, to auto-get the size. */
1178                                 *blocks =
1179                                     s->s_bdev->bd_inode->i_size >> s->
1180                                     s_blocksize_bits;
1181                         } else {
1182                                 *blocks = simple_strtoul(arg, &p, 0);
1183                                 if (*p != '\0') {
1184                                         /* NNN does not look like a number */
1185                                         reiserfs_warning(s, "super-6507",
1186                                                          "bad value %s for "
1187                                                          "-oresize\n", arg);
1188                                         return 0;
1189                                 }
1190                         }
1191                 }
1192
1193                 if (c == 'c') {
1194                         char *p = NULL;
1195                         unsigned long val = simple_strtoul(arg, &p, 0);
1196                         /* commit=NNN (time in seconds) */
1197                         if (*p != '\0' || val >= (unsigned int)-1) {
1198                                 reiserfs_warning(s, "super-6508",
1199                                                  "bad value %s for -ocommit\n",
1200                                                  arg);
1201                                 return 0;
1202                         }
1203                         *commit_max_age = (unsigned int)val;
1204                 }
1205
1206                 if (c == 'w') {
1207                         reiserfs_warning(s, "super-6509", "nolargeio option "
1208                                          "is no longer supported");
1209                         return 0;
1210                 }
1211
1212                 if (c == 'j') {
1213                         if (arg && *arg && jdev_name) {
1214                                 /* Hm, already assigned? */
1215                                 if (*jdev_name) {
1216                                         reiserfs_warning(s, "super-6510",
1217                                                          "journal device was "
1218                                                          "already specified to "
1219                                                          "be %s", *jdev_name);
1220                                         return 0;
1221                                 }
1222                                 *jdev_name = arg;
1223                         }
1224                 }
1225 #ifdef CONFIG_QUOTA
1226                 if (c == 'u' || c == 'g') {
1227                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1228
1229                         if (sb_any_quota_loaded(s) &&
1230                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1231                                 reiserfs_warning(s, "super-6511",
1232                                                  "cannot change journaled "
1233                                                  "quota options when quota "
1234                                                  "turned on.");
1235                                 return 0;
1236                         }
1237                         if (qf_names[qtype] !=
1238                             REISERFS_SB(s)->s_qf_names[qtype])
1239                                 kfree(qf_names[qtype]);
1240                         qf_names[qtype] = NULL;
1241                         if (*arg) {     /* Some filename specified? */
1242                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1243                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1244                                               arg)) {
1245                                         reiserfs_warning(s, "super-6512",
1246                                                          "%s quota file "
1247                                                          "already specified.",
1248                                                          QTYPE2NAME(qtype));
1249                                         return 0;
1250                                 }
1251                                 if (strchr(arg, '/')) {
1252                                         reiserfs_warning(s, "super-6513",
1253                                                          "quotafile must be "
1254                                                          "on filesystem root.");
1255                                         return 0;
1256                                 }
1257                                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1258                                 if (!qf_names[qtype]) {
1259                                         reiserfs_warning(s, "reiserfs-2502",
1260                                                          "not enough memory "
1261                                                          "for storing "
1262                                                          "quotafile name.");
1263                                         return 0;
1264                                 }
1265                                 if (qtype == USRQUOTA)
1266                                         *mount_options |= 1 << REISERFS_USRQUOTA;
1267                                 else
1268                                         *mount_options |= 1 << REISERFS_GRPQUOTA;
1269                         } else {
1270                                 if (qtype == USRQUOTA)
1271                                         *mount_options &= ~(1 << REISERFS_USRQUOTA);
1272                                 else
1273                                         *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1274                         }
1275                 }
1276                 if (c == 'f') {
1277                         if (!strcmp(arg, "vfsold"))
1278                                 *qfmt = QFMT_VFS_OLD;
1279                         else if (!strcmp(arg, "vfsv0"))
1280                                 *qfmt = QFMT_VFS_V0;
1281                         else {
1282                                 reiserfs_warning(s, "super-6514",
1283                                                  "unknown quota format "
1284                                                  "specified.");
1285                                 return 0;
1286                         }
1287                         if (sb_any_quota_loaded(s) &&
1288                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1289                                 reiserfs_warning(s, "super-6515",
1290                                                  "cannot change journaled "
1291                                                  "quota options when quota "
1292                                                  "turned on.");
1293                                 return 0;
1294                         }
1295                 }
1296 #else
1297                 if (c == 'u' || c == 'g' || c == 'f') {
1298                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1299                                          "quota options not supported.");
1300                         return 0;
1301                 }
1302 #endif
1303         }
1304
1305 #ifdef CONFIG_QUOTA
1306         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1307             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1308                 reiserfs_warning(s, "super-6515",
1309                                  "journaled quota format not specified.");
1310                 return 0;
1311         }
1312         if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1313                sb_has_quota_loaded(s, USRQUOTA)) ||
1314             (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1315                sb_has_quota_loaded(s, GRPQUOTA))) {
1316                 reiserfs_warning(s, "super-6516", "quota options must "
1317                                  "be present when quota is turned on.");
1318                 return 0;
1319         }
1320 #endif
1321
1322         return 1;
1323 }
1324
1325 static void switch_data_mode(struct super_block *s, unsigned long mode)
1326 {
1327         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1328                                          (1 << REISERFS_DATA_ORDERED) |
1329                                          (1 << REISERFS_DATA_WRITEBACK));
1330         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1331 }
1332
1333 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1334 {
1335         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1336                 if (!reiserfs_data_log(s)) {
1337                         switch_data_mode(s, REISERFS_DATA_LOG);
1338                         reiserfs_info(s, "switching to journaled data mode\n");
1339                 }
1340         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1341                 if (!reiserfs_data_ordered(s)) {
1342                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1343                         reiserfs_info(s, "switching to ordered data mode\n");
1344                 }
1345         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1346                 if (!reiserfs_data_writeback(s)) {
1347                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1348                         reiserfs_info(s, "switching to writeback data mode\n");
1349                 }
1350         }
1351 }
1352
1353 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1354 {
1355         int flush = (1 << REISERFS_BARRIER_FLUSH);
1356         int none = (1 << REISERFS_BARRIER_NONE);
1357         int all_barrier = flush | none;
1358
1359         if (bits & all_barrier) {
1360                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1361                 if (bits & flush) {
1362                         REISERFS_SB(s)->s_mount_opt |= flush;
1363                         printk("reiserfs: enabling write barrier flush mode\n");
1364                 } else if (bits & none) {
1365                         REISERFS_SB(s)->s_mount_opt |= none;
1366                         printk("reiserfs: write barriers turned off\n");
1367                 }
1368         }
1369 }
1370
1371 static void handle_attrs(struct super_block *s)
1372 {
1373         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1374
1375         if (reiserfs_attrs(s)) {
1376                 if (old_format_only(s)) {
1377                         reiserfs_warning(s, "super-6517", "cannot support "
1378                                          "attributes on 3.5.x disk format");
1379                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1380                         return;
1381                 }
1382                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1383                         reiserfs_warning(s, "super-6518", "cannot support "
1384                                          "attributes until flag is set in "
1385                                          "super-block");
1386                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1387                 }
1388         }
1389 }
1390
1391 #ifdef CONFIG_QUOTA
1392 static void handle_quota_files(struct super_block *s, char **qf_names,
1393                                unsigned int *qfmt)
1394 {
1395         int i;
1396
1397         for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1398                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1399                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1400                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1401         }
1402         if (*qfmt)
1403                 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1404 }
1405 #endif
1406
1407 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1408 {
1409         struct reiserfs_super_block *rs;
1410         struct reiserfs_transaction_handle th;
1411         unsigned long blocks;
1412         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1413         unsigned long safe_mask = 0;
1414         unsigned int commit_max_age = (unsigned int)-1;
1415         struct reiserfs_journal *journal = SB_JOURNAL(s);
1416         char *new_opts;
1417         int err;
1418         char *qf_names[REISERFS_MAXQUOTAS];
1419         unsigned int qfmt = 0;
1420 #ifdef CONFIG_QUOTA
1421         int i;
1422 #endif
1423
1424         new_opts = kstrdup(arg, GFP_KERNEL);
1425         if (arg && !new_opts)
1426                 return -ENOMEM;
1427
1428         sync_filesystem(s);
1429         reiserfs_write_lock(s);
1430
1431 #ifdef CONFIG_QUOTA
1432         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1433 #endif
1434
1435         rs = SB_DISK_SUPER_BLOCK(s);
1436
1437         if (!reiserfs_parse_options
1438             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1439             qf_names, &qfmt)) {
1440 #ifdef CONFIG_QUOTA
1441                 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1442                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1443                                 kfree(qf_names[i]);
1444 #endif
1445                 err = -EINVAL;
1446                 goto out_err_unlock;
1447         }
1448 #ifdef CONFIG_QUOTA
1449         handle_quota_files(s, qf_names, &qfmt);
1450 #endif
1451
1452         handle_attrs(s);
1453
1454         /* Add options that are safe here */
1455         safe_mask |= 1 << REISERFS_SMALLTAIL;
1456         safe_mask |= 1 << REISERFS_LARGETAIL;
1457         safe_mask |= 1 << REISERFS_NO_BORDER;
1458         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1459         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1460         safe_mask |= 1 << REISERFS_TEST4;
1461         safe_mask |= 1 << REISERFS_ATTRS;
1462         safe_mask |= 1 << REISERFS_XATTRS_USER;
1463         safe_mask |= 1 << REISERFS_POSIXACL;
1464         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1465         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1466         safe_mask |= 1 << REISERFS_ERROR_RO;
1467         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1468         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1469         safe_mask |= 1 << REISERFS_USRQUOTA;
1470         safe_mask |= 1 << REISERFS_GRPQUOTA;
1471
1472         /*
1473          * Update the bitmask, taking care to keep
1474          * the bits we're not allowed to change here
1475          */
1476         REISERFS_SB(s)->s_mount_opt =
1477             (REISERFS_SB(s)->
1478              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1479
1480         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1481                 journal->j_max_commit_age = commit_max_age;
1482                 journal->j_max_trans_age = commit_max_age;
1483         } else if (commit_max_age == 0) {
1484                 /* 0 means restore defaults. */
1485                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1486                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1487         }
1488
1489         if (blocks) {
1490                 err = reiserfs_resize(s, blocks);
1491                 if (err != 0)
1492                         goto out_err_unlock;
1493         }
1494
1495         if (*mount_flags & MS_RDONLY) {
1496                 reiserfs_write_unlock(s);
1497                 reiserfs_xattr_init(s, *mount_flags);
1498                 /* remount read-only */
1499                 if (s->s_flags & MS_RDONLY)
1500                         /* it is read-only already */
1501                         goto out_ok_unlocked;
1502
1503                 err = dquot_suspend(s, -1);
1504                 if (err < 0)
1505                         goto out_err;
1506
1507                 /* try to remount file system with read-only permissions */
1508                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1509                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1510                         goto out_ok_unlocked;
1511                 }
1512
1513                 reiserfs_write_lock(s);
1514
1515                 err = journal_begin(&th, s, 10);
1516                 if (err)
1517                         goto out_err_unlock;
1518
1519                 /* Mounting a rw partition read-only. */
1520                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1521                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1522                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1523         } else {
1524                 /* remount read-write */
1525                 if (!(s->s_flags & MS_RDONLY)) {
1526                         reiserfs_write_unlock(s);
1527                         reiserfs_xattr_init(s, *mount_flags);
1528                         goto out_ok_unlocked;   /* We are read-write already */
1529                 }
1530
1531                 if (reiserfs_is_journal_aborted(journal)) {
1532                         err = journal->j_errno;
1533                         goto out_err_unlock;
1534                 }
1535
1536                 handle_data_mode(s, mount_options);
1537                 handle_barrier_mode(s, mount_options);
1538                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1539
1540                 /* now it is safe to call journal_begin */
1541                 s->s_flags &= ~MS_RDONLY;
1542                 err = journal_begin(&th, s, 10);
1543                 if (err)
1544                         goto out_err_unlock;
1545
1546                 /* Mount a partition which is read-only, read-write */
1547                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1548                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1549                 s->s_flags &= ~MS_RDONLY;
1550                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1551                 if (!old_format_only(s))
1552                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1553                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1554                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1555                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1556         }
1557         /* this will force a full flush of all journal lists */
1558         SB_JOURNAL(s)->j_must_wait = 1;
1559         err = journal_end(&th);
1560         if (err)
1561                 goto out_err_unlock;
1562
1563         reiserfs_write_unlock(s);
1564         if (!(*mount_flags & MS_RDONLY)) {
1565                 dquot_resume(s, -1);
1566                 reiserfs_write_lock(s);
1567                 finish_unfinished(s);
1568                 reiserfs_write_unlock(s);
1569                 reiserfs_xattr_init(s, *mount_flags);
1570         }
1571
1572 out_ok_unlocked:
1573         if (new_opts)
1574                 replace_mount_options(s, new_opts);
1575         return 0;
1576
1577 out_err_unlock:
1578         reiserfs_write_unlock(s);
1579 out_err:
1580         kfree(new_opts);
1581         return err;
1582 }
1583
1584 static int read_super_block(struct super_block *s, int offset)
1585 {
1586         struct buffer_head *bh;
1587         struct reiserfs_super_block *rs;
1588         int fs_blocksize;
1589
1590         bh = sb_bread(s, offset / s->s_blocksize);
1591         if (!bh) {
1592                 reiserfs_warning(s, "sh-2006",
1593                                  "bread failed (dev %s, block %lu, size %lu)",
1594                                  s->s_id, offset / s->s_blocksize,
1595                                  s->s_blocksize);
1596                 return 1;
1597         }
1598
1599         rs = (struct reiserfs_super_block *)bh->b_data;
1600         if (!is_any_reiserfs_magic_string(rs)) {
1601                 brelse(bh);
1602                 return 1;
1603         }
1604         /*
1605          * ok, reiserfs signature (old or new) found in at the given offset
1606          */
1607         fs_blocksize = sb_blocksize(rs);
1608         brelse(bh);
1609         sb_set_blocksize(s, fs_blocksize);
1610
1611         bh = sb_bread(s, offset / s->s_blocksize);
1612         if (!bh) {
1613                 reiserfs_warning(s, "sh-2007",
1614                                  "bread failed (dev %s, block %lu, size %lu)",
1615                                  s->s_id, offset / s->s_blocksize,
1616                                  s->s_blocksize);
1617                 return 1;
1618         }
1619
1620         rs = (struct reiserfs_super_block *)bh->b_data;
1621         if (sb_blocksize(rs) != s->s_blocksize) {
1622                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1623                                  "filesystem on (dev %s, block %llu, size %lu)",
1624                                  s->s_id,
1625                                  (unsigned long long)bh->b_blocknr,
1626                                  s->s_blocksize);
1627                 brelse(bh);
1628                 return 1;
1629         }
1630
1631         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1632                 brelse(bh);
1633                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1634                                  "--rebuild-tree run detected. Please run\n"
1635                                  "reiserfsck --rebuild-tree and wait for a "
1636                                  "completion. If that fails\n"
1637                                  "get newer reiserfsprogs package");
1638                 return 1;
1639         }
1640
1641         SB_BUFFER_WITH_SB(s) = bh;
1642         SB_DISK_SUPER_BLOCK(s) = rs;
1643
1644         /*
1645          * magic is of non-standard journal filesystem, look at s_version to
1646          * find which format is in use
1647          */
1648         if (is_reiserfs_jr(rs)) {
1649                 if (sb_version(rs) == REISERFS_VERSION_2)
1650                         reiserfs_info(s, "found reiserfs format \"3.6\""
1651                                       " with non-standard journal\n");
1652                 else if (sb_version(rs) == REISERFS_VERSION_1)
1653                         reiserfs_info(s, "found reiserfs format \"3.5\""
1654                                       " with non-standard journal\n");
1655                 else {
1656                         reiserfs_warning(s, "sh-2012", "found unknown "
1657                                          "format \"%u\" of reiserfs with "
1658                                          "non-standard magic", sb_version(rs));
1659                         return 1;
1660                 }
1661         } else
1662                 /*
1663                  * s_version of standard format may contain incorrect
1664                  * information, so we just look at the magic string
1665                  */
1666                 reiserfs_info(s,
1667                               "found reiserfs format \"%s\" with standard journal\n",
1668                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1669
1670         s->s_op = &reiserfs_sops;
1671         s->s_export_op = &reiserfs_export_ops;
1672 #ifdef CONFIG_QUOTA
1673         s->s_qcop = &reiserfs_qctl_operations;
1674         s->dq_op = &reiserfs_quota_operations;
1675         s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1676 #endif
1677
1678         /*
1679          * new format is limited by the 32 bit wide i_blocks field, want to
1680          * be one full block below that.
1681          */
1682         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1683         return 0;
1684 }
1685
1686 /* after journal replay, reread all bitmap and super blocks */
1687 static int reread_meta_blocks(struct super_block *s)
1688 {
1689         ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1690         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1691         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1692                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1693                 return 1;
1694         }
1695
1696         return 0;
1697 }
1698
1699 /* hash detection stuff */
1700
1701 /*
1702  * if root directory is empty - we set default - Yura's - hash and
1703  * warn about it
1704  * FIXME: we look for only one name in a directory. If tea and yura
1705  * both have the same value - we ask user to send report to the
1706  * mailing list
1707  */
1708 static __u32 find_hash_out(struct super_block *s)
1709 {
1710         int retval;
1711         struct inode *inode;
1712         struct cpu_key key;
1713         INITIALIZE_PATH(path);
1714         struct reiserfs_dir_entry de;
1715         struct reiserfs_de_head *deh;
1716         __u32 hash = DEFAULT_HASH;
1717         __u32 deh_hashval, teahash, r5hash, yurahash;
1718
1719         inode = d_inode(s->s_root);
1720
1721         make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1722         retval = search_by_entry_key(s, &key, &path, &de);
1723         if (retval == IO_ERROR) {
1724                 pathrelse(&path);
1725                 return UNSET_HASH;
1726         }
1727         if (retval == NAME_NOT_FOUND)
1728                 de.de_entry_num--;
1729
1730         set_de_name_and_namelen(&de);
1731         deh = de.de_deh + de.de_entry_num;
1732
1733         if (deh_offset(deh) == DOT_DOT_OFFSET) {
1734                 /* allow override in this case */
1735                 if (reiserfs_rupasov_hash(s))
1736                         hash = YURA_HASH;
1737                 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1738                 goto out;
1739         }
1740
1741         deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1742         r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1743         teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1744         yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1745
1746         if ((teahash == r5hash && deh_hashval == r5hash) ||
1747             (teahash == yurahash && deh_hashval == yurahash) ||
1748             (r5hash == yurahash && deh_hashval == yurahash)) {
1749                 reiserfs_warning(s, "reiserfs-2506",
1750                                  "Unable to automatically detect hash "
1751                                  "function. Please mount with -o "
1752                                  "hash={tea,rupasov,r5}");
1753                 hash = UNSET_HASH;
1754                 goto out;
1755         }
1756
1757         if (deh_hashval == yurahash)
1758                 hash = YURA_HASH;
1759         else if (deh_hashval == teahash)
1760                 hash = TEA_HASH;
1761         else if (deh_hashval == r5hash)
1762                 hash = R5_HASH;
1763         else {
1764                 reiserfs_warning(s, "reiserfs-2506",
1765                                  "Unrecognised hash function");
1766                 hash = UNSET_HASH;
1767         }
1768 out:
1769         pathrelse(&path);
1770         return hash;
1771 }
1772
1773 /* finds out which hash names are sorted with */
1774 static int what_hash(struct super_block *s)
1775 {
1776         __u32 code;
1777
1778         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1779
1780         /*
1781          * reiserfs_hash_detect() == true if any of the hash mount options
1782          * were used.  We must check them to make sure the user isn't
1783          * using a bad hash value
1784          */
1785         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1786                 code = find_hash_out(s);
1787
1788         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1789                 /*
1790                  * detection has found the hash, and we must check against the
1791                  * mount options
1792                  */
1793                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1794                         reiserfs_warning(s, "reiserfs-2507",
1795                                          "Error, %s hash detected, "
1796                                          "unable to force rupasov hash",
1797                                          reiserfs_hashname(code));
1798                         code = UNSET_HASH;
1799                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1800                         reiserfs_warning(s, "reiserfs-2508",
1801                                          "Error, %s hash detected, "
1802                                          "unable to force tea hash",
1803                                          reiserfs_hashname(code));
1804                         code = UNSET_HASH;
1805                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1806                         reiserfs_warning(s, "reiserfs-2509",
1807                                          "Error, %s hash detected, "
1808                                          "unable to force r5 hash",
1809                                          reiserfs_hashname(code));
1810                         code = UNSET_HASH;
1811                 }
1812         } else {
1813                 /*
1814                  * find_hash_out was not called or
1815                  * could not determine the hash
1816                  */
1817                 if (reiserfs_rupasov_hash(s)) {
1818                         code = YURA_HASH;
1819                 } else if (reiserfs_tea_hash(s)) {
1820                         code = TEA_HASH;
1821                 } else if (reiserfs_r5_hash(s)) {
1822                         code = R5_HASH;
1823                 }
1824         }
1825
1826         /*
1827          * if we are mounted RW, and we have a new valid hash code, update
1828          * the super
1829          */
1830         if (code != UNSET_HASH &&
1831             !(s->s_flags & MS_RDONLY) &&
1832             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1833                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1834         }
1835         return code;
1836 }
1837
1838 /* return pointer to appropriate function */
1839 static hashf_t hash_function(struct super_block *s)
1840 {
1841         switch (what_hash(s)) {
1842         case TEA_HASH:
1843                 reiserfs_info(s, "Using tea hash to sort names\n");
1844                 return keyed_hash;
1845         case YURA_HASH:
1846                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1847                 return yura_hash;
1848         case R5_HASH:
1849                 reiserfs_info(s, "Using r5 hash to sort names\n");
1850                 return r5_hash;
1851         }
1852         return NULL;
1853 }
1854
1855 /* this is used to set up correct value for old partitions */
1856 static int function2code(hashf_t func)
1857 {
1858         if (func == keyed_hash)
1859                 return TEA_HASH;
1860         if (func == yura_hash)
1861                 return YURA_HASH;
1862         if (func == r5_hash)
1863                 return R5_HASH;
1864
1865         BUG();                  /* should never happen */
1866
1867         return 0;
1868 }
1869
1870 #define SWARN(silent, s, id, ...)                       \
1871         if (!(silent))                          \
1872                 reiserfs_warning(s, id, __VA_ARGS__)
1873
1874 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1875 {
1876         struct inode *root_inode;
1877         struct reiserfs_transaction_handle th;
1878         int old_format = 0;
1879         unsigned long blocks;
1880         unsigned int commit_max_age = 0;
1881         int jinit_done = 0;
1882         struct reiserfs_iget_args args;
1883         struct reiserfs_super_block *rs;
1884         char *jdev_name;
1885         struct reiserfs_sb_info *sbi;
1886         int errval = -EINVAL;
1887         char *qf_names[REISERFS_MAXQUOTAS] = {};
1888         unsigned int qfmt = 0;
1889
1890         save_mount_options(s, data);
1891
1892         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1893         if (!sbi)
1894                 return -ENOMEM;
1895         s->s_fs_info = sbi;
1896         /* Set default values for options: non-aggressive tails, RO on errors */
1897         sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1898         sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1899         sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1900         /* no preallocation minimum, be smart in reiserfs_file_write instead */
1901         sbi->s_alloc_options.preallocmin = 0;
1902         /* Preallocate by 16 blocks (17-1) at once */
1903         sbi->s_alloc_options.preallocsize = 17;
1904         /* setup default block allocator options */
1905         reiserfs_init_alloc_options(s);
1906
1907         spin_lock_init(&sbi->old_work_lock);
1908         INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1909         mutex_init(&sbi->lock);
1910         sbi->lock_depth = -1;
1911
1912         sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1913                                          s->s_id);
1914         if (!sbi->commit_wq) {
1915                 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1916                 errval = -ENOMEM;
1917                 goto error_unlocked;
1918         }
1919
1920         jdev_name = NULL;
1921         if (reiserfs_parse_options
1922             (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1923              &commit_max_age, qf_names, &qfmt) == 0) {
1924                 goto error_unlocked;
1925         }
1926         if (jdev_name && jdev_name[0]) {
1927                 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1928                 if (!sbi->s_jdev) {
1929                         SWARN(silent, s, "", "Cannot allocate memory for "
1930                                 "journal device name");
1931                         goto error_unlocked;
1932                 }
1933         }
1934 #ifdef CONFIG_QUOTA
1935         handle_quota_files(s, qf_names, &qfmt);
1936 #endif
1937
1938         if (blocks) {
1939                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1940                 goto error_unlocked;
1941         }
1942
1943         /*
1944          * try old format (undistributed bitmap, super block in 8-th 1k
1945          * block of a device)
1946          */
1947         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1948                 old_format = 1;
1949
1950         /*
1951          * try new format (64-th 1k block), which can contain reiserfs
1952          * super block
1953          */
1954         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1955                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1956                       s->s_id);
1957                 goto error_unlocked;
1958         }
1959
1960         rs = SB_DISK_SUPER_BLOCK(s);
1961         /*
1962          * Let's do basic sanity check to verify that underlying device is not
1963          * smaller than the filesystem. If the check fails then abort and
1964          * scream, because bad stuff will happen otherwise.
1965          */
1966         if (s->s_bdev && s->s_bdev->bd_inode
1967             && i_size_read(s->s_bdev->bd_inode) <
1968             sb_block_count(rs) * sb_blocksize(rs)) {
1969                 SWARN(silent, s, "", "Filesystem cannot be "
1970                       "mounted because it is bigger than the device");
1971                 SWARN(silent, s, "", "You may need to run fsck "
1972                       "or increase size of your LVM partition");
1973                 SWARN(silent, s, "", "Or may be you forgot to "
1974                       "reboot after fdisk when it told you to");
1975                 goto error_unlocked;
1976         }
1977
1978         sbi->s_mount_state = SB_REISERFS_STATE(s);
1979         sbi->s_mount_state = REISERFS_VALID_FS;
1980
1981         if ((errval = reiserfs_init_bitmap_cache(s))) {
1982                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1983                 goto error_unlocked;
1984         }
1985
1986         errval = -EINVAL;
1987 #ifdef CONFIG_REISERFS_CHECK
1988         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1989         SWARN(silent, s, "", "- it is slow mode for debugging.");
1990 #endif
1991
1992         /* make data=ordered the default */
1993         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1994             !reiserfs_data_writeback(s)) {
1995                 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1996         }
1997
1998         if (reiserfs_data_log(s)) {
1999                 reiserfs_info(s, "using journaled data mode\n");
2000         } else if (reiserfs_data_ordered(s)) {
2001                 reiserfs_info(s, "using ordered data mode\n");
2002         } else {
2003                 reiserfs_info(s, "using writeback data mode\n");
2004         }
2005         if (reiserfs_barrier_flush(s)) {
2006                 printk("reiserfs: using flush barriers\n");
2007         }
2008
2009         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2010                 SWARN(silent, s, "sh-2022",
2011                       "unable to initialize journal space");
2012                 goto error_unlocked;
2013         } else {
2014                 /*
2015                  * once this is set, journal_release must be called
2016                  * if we error out of the mount
2017                  */
2018                 jinit_done = 1;
2019         }
2020
2021         if (reread_meta_blocks(s)) {
2022                 SWARN(silent, s, "jmacd-9",
2023                       "unable to reread meta blocks after journal init");
2024                 goto error_unlocked;
2025         }
2026
2027         if (replay_only(s))
2028                 goto error_unlocked;
2029
2030         s->s_xattr = reiserfs_xattr_handlers;
2031
2032         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2033                 SWARN(silent, s, "clm-7000",
2034                       "Detected readonly device, marking FS readonly");
2035                 s->s_flags |= MS_RDONLY;
2036         }
2037         args.objectid = REISERFS_ROOT_OBJECTID;
2038         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2039         root_inode =
2040             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2041                          reiserfs_init_locked_inode, (void *)&args);
2042         if (!root_inode) {
2043                 SWARN(silent, s, "jmacd-10", "get root inode failed");
2044                 goto error_unlocked;
2045         }
2046
2047         /*
2048          * This path assumed to be called with the BKL in the old times.
2049          * Now we have inherited the big reiserfs lock from it and many
2050          * reiserfs helpers called in the mount path and elsewhere require
2051          * this lock to be held even if it's not always necessary. Let's be
2052          * conservative and hold it early. The window can be reduced after
2053          * careful review of the code.
2054          */
2055         reiserfs_write_lock(s);
2056
2057         if (root_inode->i_state & I_NEW) {
2058                 reiserfs_read_locked_inode(root_inode, &args);
2059                 unlock_new_inode(root_inode);
2060         }
2061
2062         if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
2063             !root_inode->i_size) {
2064                 SWARN(silent, s, "", "corrupt root inode, run fsck");
2065                 iput(root_inode);
2066                 errval = -EUCLEAN;
2067                 goto error;
2068         }
2069
2070         s->s_root = d_make_root(root_inode);
2071         if (!s->s_root)
2072                 goto error;
2073         /* define and initialize hash function */
2074         sbi->s_hash_function = hash_function(s);
2075         if (sbi->s_hash_function == NULL) {
2076                 dput(s->s_root);
2077                 s->s_root = NULL;
2078                 goto error;
2079         }
2080
2081         if (is_reiserfs_3_5(rs)
2082             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2083                 set_bit(REISERFS_3_5, &sbi->s_properties);
2084         else if (old_format)
2085                 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2086         else
2087                 set_bit(REISERFS_3_6, &sbi->s_properties);
2088
2089         if (!(s->s_flags & MS_RDONLY)) {
2090
2091                 errval = journal_begin(&th, s, 1);
2092                 if (errval) {
2093                         dput(s->s_root);
2094                         s->s_root = NULL;
2095                         goto error;
2096                 }
2097                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2098
2099                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2100                 set_sb_fs_state(rs, 0);
2101
2102                 /*
2103                  * Clear out s_bmap_nr if it would wrap. We can handle this
2104                  * case, but older revisions can't. This will cause the
2105                  * file system to fail mount on those older implementations,
2106                  * avoiding corruption. -jeffm
2107                  */
2108                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2109                     sb_bmap_nr(rs) != 0) {
2110                         reiserfs_warning(s, "super-2030", "This file system "
2111                                         "claims to use %u bitmap blocks in "
2112                                         "its super block, but requires %u. "
2113                                         "Clearing to zero.", sb_bmap_nr(rs),
2114                                         reiserfs_bmap_count(s));
2115
2116                         set_sb_bmap_nr(rs, 0);
2117                 }
2118
2119                 if (old_format_only(s)) {
2120                         /*
2121                          * filesystem of format 3.5 either with standard
2122                          * or non-standard journal
2123                          */
2124                         if (convert_reiserfs(s)) {
2125                                 /* and -o conv is given */
2126                                 if (!silent)
2127                                         reiserfs_info(s,
2128                                                       "converting 3.5 filesystem to the 3.6 format");
2129
2130                                 if (is_reiserfs_3_5(rs))
2131                                         /*
2132                                          * put magic string of 3.6 format.
2133                                          * 2.2 will not be able to
2134                                          * mount this filesystem anymore
2135                                          */
2136                                         memcpy(rs->s_v1.s_magic,
2137                                                reiserfs_3_6_magic_string,
2138                                                sizeof
2139                                                (reiserfs_3_6_magic_string));
2140
2141                                 set_sb_version(rs, REISERFS_VERSION_2);
2142                                 reiserfs_convert_objectid_map_v1(s);
2143                                 set_bit(REISERFS_3_6, &sbi->s_properties);
2144                                 clear_bit(REISERFS_3_5, &sbi->s_properties);
2145                         } else if (!silent) {
2146                                 reiserfs_info(s, "using 3.5.x disk format\n");
2147                         }
2148                 } else
2149                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2150
2151
2152                 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2153                 errval = journal_end(&th);
2154                 if (errval) {
2155                         dput(s->s_root);
2156                         s->s_root = NULL;
2157                         goto error;
2158                 }
2159
2160                 reiserfs_write_unlock(s);
2161                 if ((errval = reiserfs_lookup_privroot(s)) ||
2162                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2163                         dput(s->s_root);
2164                         s->s_root = NULL;
2165                         goto error_unlocked;
2166                 }
2167                 reiserfs_write_lock(s);
2168
2169                 /*
2170                  * look for files which were to be removed in previous session
2171                  */
2172                 finish_unfinished(s);
2173         } else {
2174                 if (old_format_only(s) && !silent) {
2175                         reiserfs_info(s, "using 3.5.x disk format\n");
2176                 }
2177
2178                 reiserfs_write_unlock(s);
2179                 if ((errval = reiserfs_lookup_privroot(s)) ||
2180                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
2181                         dput(s->s_root);
2182                         s->s_root = NULL;
2183                         goto error_unlocked;
2184                 }
2185                 reiserfs_write_lock(s);
2186         }
2187         /*
2188          * mark hash in super block: it could be unset. overwrite should be ok
2189          */
2190         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2191
2192         handle_attrs(s);
2193
2194         reiserfs_proc_info_init(s);
2195
2196         init_waitqueue_head(&(sbi->s_wait));
2197         spin_lock_init(&sbi->bitmap_lock);
2198
2199         reiserfs_write_unlock(s);
2200
2201         return (0);
2202
2203 error:
2204         reiserfs_write_unlock(s);
2205
2206 error_unlocked:
2207         /* kill the commit thread, free journal ram */
2208         if (jinit_done) {
2209                 reiserfs_write_lock(s);
2210                 journal_release_error(NULL, s);
2211                 reiserfs_write_unlock(s);
2212         }
2213
2214         if (sbi->commit_wq)
2215                 destroy_workqueue(sbi->commit_wq);
2216
2217         reiserfs_cancel_old_flush(s);
2218
2219         reiserfs_free_bitmap_cache(s);
2220         if (SB_BUFFER_WITH_SB(s))
2221                 brelse(SB_BUFFER_WITH_SB(s));
2222 #ifdef CONFIG_QUOTA
2223         {
2224                 int j;
2225                 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2226                         kfree(qf_names[j]);
2227         }
2228 #endif
2229         kfree(sbi->s_jdev);
2230         kfree(sbi);
2231
2232         s->s_fs_info = NULL;
2233         return errval;
2234 }
2235
2236 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2237 {
2238         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2239
2240         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2241         buf->f_bfree = sb_free_blocks(rs);
2242         buf->f_bavail = buf->f_bfree;
2243         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2244         buf->f_bsize = dentry->d_sb->s_blocksize;
2245         /* changed to accommodate gcc folks. */
2246         buf->f_type = REISERFS_SUPER_MAGIC;
2247         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2248         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2249                                 sizeof(rs->s_uuid)/2);
2250
2251         return 0;
2252 }
2253
2254 #ifdef CONFIG_QUOTA
2255 static int reiserfs_write_dquot(struct dquot *dquot)
2256 {
2257         struct reiserfs_transaction_handle th;
2258         int ret, err;
2259         int depth;
2260
2261         reiserfs_write_lock(dquot->dq_sb);
2262         ret =
2263             journal_begin(&th, dquot->dq_sb,
2264                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2265         if (ret)
2266                 goto out;
2267         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2268         ret = dquot_commit(dquot);
2269         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2270         err = journal_end(&th);
2271         if (!ret && err)
2272                 ret = err;
2273 out:
2274         reiserfs_write_unlock(dquot->dq_sb);
2275         return ret;
2276 }
2277
2278 static int reiserfs_acquire_dquot(struct dquot *dquot)
2279 {
2280         struct reiserfs_transaction_handle th;
2281         int ret, err;
2282         int depth;
2283
2284         reiserfs_write_lock(dquot->dq_sb);
2285         ret =
2286             journal_begin(&th, dquot->dq_sb,
2287                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2288         if (ret)
2289                 goto out;
2290         depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2291         ret = dquot_acquire(dquot);
2292         reiserfs_write_lock_nested(dquot->dq_sb, depth);
2293         err = journal_end(&th);
2294         if (!ret && err)
2295                 ret = err;
2296 out:
2297         reiserfs_write_unlock(dquot->dq_sb);
2298         return ret;
2299 }
2300
2301 static int reiserfs_release_dquot(struct dquot *dquot)
2302 {
2303         struct reiserfs_transaction_handle th;
2304         int ret, err;
2305
2306         reiserfs_write_lock(dquot->dq_sb);
2307         ret =
2308             journal_begin(&th, dquot->dq_sb,
2309                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2310         reiserfs_write_unlock(dquot->dq_sb);
2311         if (ret) {
2312                 /* Release dquot anyway to avoid endless cycle in dqput() */
2313                 dquot_release(dquot);
2314                 goto out;
2315         }
2316         ret = dquot_release(dquot);
2317         reiserfs_write_lock(dquot->dq_sb);
2318         err = journal_end(&th);
2319         if (!ret && err)
2320                 ret = err;
2321         reiserfs_write_unlock(dquot->dq_sb);
2322 out:
2323         return ret;
2324 }
2325
2326 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2327 {
2328         /* Are we journaling quotas? */
2329         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2330             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2331                 dquot_mark_dquot_dirty(dquot);
2332                 return reiserfs_write_dquot(dquot);
2333         } else
2334                 return dquot_mark_dquot_dirty(dquot);
2335 }
2336
2337 static int reiserfs_write_info(struct super_block *sb, int type)
2338 {
2339         struct reiserfs_transaction_handle th;
2340         int ret, err;
2341         int depth;
2342
2343         /* Data block + inode block */
2344         reiserfs_write_lock(sb);
2345         ret = journal_begin(&th, sb, 2);
2346         if (ret)
2347                 goto out;
2348         depth = reiserfs_write_unlock_nested(sb);
2349         ret = dquot_commit_info(sb, type);
2350         reiserfs_write_lock_nested(sb, depth);
2351         err = journal_end(&th);
2352         if (!ret && err)
2353                 ret = err;
2354 out:
2355         reiserfs_write_unlock(sb);
2356         return ret;
2357 }
2358
2359 /*
2360  * Turn on quotas during mount time - we need to find the quota file and such...
2361  */
2362 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2363 {
2364         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2365                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2366 }
2367
2368 /*
2369  * Standard function to be called on quota_on
2370  */
2371 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2372                              struct path *path)
2373 {
2374         int err;
2375         struct inode *inode;
2376         struct reiserfs_transaction_handle th;
2377         int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2378
2379         reiserfs_write_lock(sb);
2380         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2381                 err = -EINVAL;
2382                 goto out;
2383         }
2384
2385         /* Quotafile not on the same filesystem? */
2386         if (path->dentry->d_sb != sb) {
2387                 err = -EXDEV;
2388                 goto out;
2389         }
2390         inode = d_inode(path->dentry);
2391         /*
2392          * We must not pack tails for quota files on reiserfs for quota
2393          * IO to work
2394          */
2395         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2396                 err = reiserfs_unpack(inode, NULL);
2397                 if (err) {
2398                         reiserfs_warning(sb, "super-6520",
2399                                 "Unpacking tail of quota file failed"
2400                                 " (%d). Cannot turn on quotas.", err);
2401                         err = -EINVAL;
2402                         goto out;
2403                 }
2404                 mark_inode_dirty(inode);
2405         }
2406         /* Journaling quota? */
2407         if (REISERFS_SB(sb)->s_qf_names[type]) {
2408                 /* Quotafile not of fs root? */
2409                 if (path->dentry->d_parent != sb->s_root)
2410                         reiserfs_warning(sb, "super-6521",
2411                                  "Quota file not on filesystem root. "
2412                                  "Journalled quota will not work.");
2413         }
2414
2415         /*
2416          * When we journal data on quota file, we have to flush journal to see
2417          * all updates to the file when we bypass pagecache...
2418          */
2419         if (reiserfs_file_data_log(inode)) {
2420                 /* Just start temporary transaction and finish it */
2421                 err = journal_begin(&th, sb, 1);
2422                 if (err)
2423                         goto out;
2424                 err = journal_end_sync(&th);
2425                 if (err)
2426                         goto out;
2427         }
2428         reiserfs_write_unlock(sb);
2429         return dquot_quota_on(sb, type, format_id, path);
2430 out:
2431         reiserfs_write_unlock(sb);
2432         return err;
2433 }
2434
2435 /*
2436  * Read data from quotafile - avoid pagecache and such because we cannot afford
2437  * acquiring the locks... As quota files are never truncated and quota code
2438  * itself serializes the operations (and no one else should touch the files)
2439  * we don't have to be afraid of races
2440  */
2441 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2442                                    size_t len, loff_t off)
2443 {
2444         struct inode *inode = sb_dqopt(sb)->files[type];
2445         unsigned long blk = off >> sb->s_blocksize_bits;
2446         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2447         size_t toread;
2448         struct buffer_head tmp_bh, *bh;
2449         loff_t i_size = i_size_read(inode);
2450
2451         if (off > i_size)
2452                 return 0;
2453         if (off + len > i_size)
2454                 len = i_size - off;
2455         toread = len;
2456         while (toread > 0) {
2457                 tocopy =
2458                     sb->s_blocksize - offset <
2459                     toread ? sb->s_blocksize - offset : toread;
2460                 tmp_bh.b_state = 0;
2461                 /*
2462                  * Quota files are without tails so we can safely
2463                  * use this function
2464                  */
2465                 reiserfs_write_lock(sb);
2466                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2467                 reiserfs_write_unlock(sb);
2468                 if (err)
2469                         return err;
2470                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2471                         memset(data, 0, tocopy);
2472                 else {
2473                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2474                         if (!bh)
2475                                 return -EIO;
2476                         memcpy(data, bh->b_data + offset, tocopy);
2477                         brelse(bh);
2478                 }
2479                 offset = 0;
2480                 toread -= tocopy;
2481                 data += tocopy;
2482                 blk++;
2483         }
2484         return len;
2485 }
2486
2487 /*
2488  * Write to quotafile (we know the transaction is already started and has
2489  * enough credits)
2490  */
2491 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2492                                     const char *data, size_t len, loff_t off)
2493 {
2494         struct inode *inode = sb_dqopt(sb)->files[type];
2495         unsigned long blk = off >> sb->s_blocksize_bits;
2496         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2497         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2498         size_t towrite = len;
2499         struct buffer_head tmp_bh, *bh;
2500
2501         if (!current->journal_info) {
2502                 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2503                         (unsigned long long)off, (unsigned long long)len);
2504                 return -EIO;
2505         }
2506         while (towrite > 0) {
2507                 tocopy = sb->s_blocksize - offset < towrite ?
2508                     sb->s_blocksize - offset : towrite;
2509                 tmp_bh.b_state = 0;
2510                 reiserfs_write_lock(sb);
2511                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2512                 reiserfs_write_unlock(sb);
2513                 if (err)
2514                         goto out;
2515                 if (offset || tocopy != sb->s_blocksize)
2516                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2517                 else
2518                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2519                 if (!bh) {
2520                         err = -EIO;
2521                         goto out;
2522                 }
2523                 lock_buffer(bh);
2524                 memcpy(bh->b_data + offset, data, tocopy);
2525                 flush_dcache_page(bh->b_page);
2526                 set_buffer_uptodate(bh);
2527                 unlock_buffer(bh);
2528                 reiserfs_write_lock(sb);
2529                 reiserfs_prepare_for_journal(sb, bh, 1);
2530                 journal_mark_dirty(current->journal_info, bh);
2531                 if (!journal_quota)
2532                         reiserfs_add_ordered_list(inode, bh);
2533                 reiserfs_write_unlock(sb);
2534                 brelse(bh);
2535                 offset = 0;
2536                 towrite -= tocopy;
2537                 data += tocopy;
2538                 blk++;
2539         }
2540 out:
2541         if (len == towrite)
2542                 return err;
2543         if (inode->i_size < off + len - towrite)
2544                 i_size_write(inode, off + len - towrite);
2545         inode->i_mtime = inode->i_ctime = current_time(inode);
2546         mark_inode_dirty(inode);
2547         return len - towrite;
2548 }
2549
2550 #endif
2551
2552 static struct dentry *get_super_block(struct file_system_type *fs_type,
2553                            int flags, const char *dev_name,
2554                            void *data)
2555 {
2556         return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2557 }
2558
2559 static int __init init_reiserfs_fs(void)
2560 {
2561         int ret;
2562
2563         ret = init_inodecache();
2564         if (ret)
2565                 return ret;
2566
2567         reiserfs_proc_info_global_init();
2568
2569         ret = register_filesystem(&reiserfs_fs_type);
2570         if (ret)
2571                 goto out;
2572
2573         return 0;
2574 out:
2575         reiserfs_proc_info_global_done();
2576         destroy_inodecache();
2577
2578         return ret;
2579 }
2580
2581 static void __exit exit_reiserfs_fs(void)
2582 {
2583         reiserfs_proc_info_global_done();
2584         unregister_filesystem(&reiserfs_fs_type);
2585         destroy_inodecache();
2586 }
2587
2588 struct file_system_type reiserfs_fs_type = {
2589         .owner = THIS_MODULE,
2590         .name = "reiserfs",
2591         .mount = get_super_block,
2592         .kill_sb = reiserfs_kill_sb,
2593         .fs_flags = FS_REQUIRES_DEV,
2594 };
2595 MODULE_ALIAS_FS("reiserfs");
2596
2597 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2598 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2599 MODULE_LICENSE("GPL");
2600
2601 module_init(init_reiserfs_fs);
2602 module_exit(exit_reiserfs_fs);