SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  48                              unsigned long journal_devnum);
  49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  50                                unsigned int);
  51 static void ext3_commit_super (struct super_block * sb,
  52                                struct ext3_super_block * es,
  53                                int sync);
  54 static void ext3_mark_recovery_complete(struct super_block * sb,
  55                                         struct ext3_super_block * es);
  56 static void ext3_clear_journal_err(struct super_block * sb,
  57                                    struct ext3_super_block * es);
  58 static int ext3_sync_fs(struct super_block *sb, int wait);
  59 static const char *ext3_decode_error(struct super_block * sb, int errno,
  60                                      char nbuf[16]);
  61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  63 static void ext3_unlockfs(struct super_block *sb);
  64 static void ext3_write_super (struct super_block * sb);
  65 static void ext3_write_super_lockfs(struct super_block *sb);
  66
  67 /*
  68  * Wrappers for journal_start/end.
  69  *
  70  * The only special thing we need to do here is to make sure that all
  71  * journal_end calls result in the superblock being marked dirty, so
  72  * that sync() will call the filesystem's write_super callback if
  73  * appropriate.
  74  */
  75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  76 {
  77         journal_t *journal;
  78
  79         if (sb->s_flags & MS_RDONLY)
  80                 return ERR_PTR(-EROFS);
  81
  82         /* Special case here: if the journal has aborted behind our
  83          * backs (eg. EIO in the commit thread), then we still need to
  84          * take the FS itself readonly cleanly. */
  85         journal = EXT3_SB(sb)->s_journal;
  86         if (is_journal_aborted(journal)) {
  87                 ext3_abort(sb, __FUNCTION__,
  88                            "Detected aborted journal");
  89                 return ERR_PTR(-EROFS);
  90         }
  91
  92         return journal_start(journal, nblocks);
  93 }
  94
  95 /*
  96  * The only special thing we need to do here is to make sure that all
  97  * journal_stop calls result in the superblock being marked dirty, so
  98  * that sync() will call the filesystem's write_super callback if
  99  * appropriate.
 100  */
 101 int __ext3_journal_stop(const char *where, handle_t *handle)
 102 {
 103         struct super_block *sb;
 104         int err;
 105         int rc;
 106
 107         sb = handle->h_transaction->t_journal->j_private;
 108         err = handle->h_err;
 109         rc = journal_stop(handle);
 110
 111         if (!err)
 112                 err = rc;
 113         if (err)
 114                 __ext3_std_error(sb, where, err);
 115         return err;
 116 }
 117
 118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 119                 struct buffer_head *bh, handle_t *handle, int err)
 120 {
 121         char nbuf[16];
 122         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 123
 124         if (bh)
 125                 BUFFER_TRACE(bh, "abort");
 126
 127         if (!handle->h_err)
 128                 handle->h_err = err;
 129
 130         if (is_handle_aborted(handle))
 131                 return;
 132
 133         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 134                caller, errstr, err_fn);
 135
 136         journal_abort_handle(handle);
 137 }
 138
 139 /* Deal with the reporting of failure conditions on a filesystem such as
 140  * inconsistencies detected or read IO failures.
 141  *
 142  * On ext2, we can store the error state of the filesystem in the
 143  * superblock.  That is not possible on ext3, because we may have other
 144  * write ordering constraints on the superblock which prevent us from
 145  * writing it out straight away; and given that the journal is about to
 146  * be aborted, we can't rely on the current, or future, transactions to
 147  * write out the superblock safely.
 148  *
 149  * We'll just use the journal_abort() error code to record an error in
 150  * the journal instead.  On recovery, the journal will compain about
 151  * that error until we've noted it down and cleared it.
 152  */
 153
 154 static void ext3_handle_error(struct super_block *sb)
 155 {
 156         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 157
 158         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 159         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 160
 161         if (sb->s_flags & MS_RDONLY)
 162                 return;
 163
 164         if (!test_opt (sb, ERRORS_CONT)) {
 165                 journal_t *journal = EXT3_SB(sb)->s_journal;
 166
 167                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 168                 if (journal)
 169                         journal_abort(journal, -EIO);
 170         }
 171         if (test_opt (sb, ERRORS_RO)) {
 172                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 173                 sb->s_flags |= MS_RDONLY;
 174         }
 175         ext3_commit_super(sb, es, 1);
 176         if (test_opt(sb, ERRORS_PANIC))
 177                 panic("EXT3-fs (device %s): panic forced after error\n",
 178                         sb->s_id);
 179 }
 180
 181 void ext3_error (struct super_block * sb, const char * function,
 182                  const char * fmt, ...)
 183 {
 184         va_list args;
 185
 186         va_start(args, fmt);
 187         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 188         vprintk(fmt, args);
 189         printk("\n");
 190         va_end(args);
 191
 192         ext3_handle_error(sb);
 193 }
 194
 195 static const char *ext3_decode_error(struct super_block * sb, int errno,
 196                                      char nbuf[16])
 197 {
 198         char *errstr = NULL;
 199
 200         switch (errno) {
 201         case -EIO:
 202                 errstr = "IO failure";
 203                 break;
 204         case -ENOMEM:
 205                 errstr = "Out of memory";
 206                 break;
 207         case -EROFS:
 208                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 209                         errstr = "Journal has aborted";
 210                 else
 211                         errstr = "Readonly filesystem";
 212                 break;
 213         default:
 214                 /* If the caller passed in an extra buffer for unknown
 215                  * errors, textualise them now.  Else we just return
 216                  * NULL. */
 217                 if (nbuf) {
 218                         /* Check for truncated error codes... */
 219                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 220                                 errstr = nbuf;
 221                 }
 222                 break;
 223         }
 224
 225         return errstr;
 226 }
 227
 228 /* __ext3_std_error decodes expected errors from journaling functions
 229  * automatically and invokes the appropriate error response.  */
 230
 231 void __ext3_std_error (struct super_block * sb, const char * function,
 232                        int errno)
 233 {
 234         char nbuf[16];
 235         const char *errstr;
 236
 237         /* Special case: if the error is EROFS, and we're not already
 238          * inside a transaction, then there's really no point in logging
 239          * an error. */
 240         if (errno == -EROFS && journal_current_handle() == NULL &&
 241             (sb->s_flags & MS_RDONLY))
 242                 return;
 243
 244         errstr = ext3_decode_error(sb, errno, nbuf);
 245         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 246                 sb->s_id, function, errstr);
 247
 248         ext3_handle_error(sb);
 249 }
 250
 251 /*
 252  * ext3_abort is a much stronger failure handler than ext3_error.  The
 253  * abort function may be used to deal with unrecoverable failures such
 254  * as journal IO errors or ENOMEM at a critical moment in log management.
 255  *
 256  * We unconditionally force the filesystem into an ABORT|READONLY state,
 257  * unless the error response on the fs has been set to panic in which
 258  * case we take the easy way out and panic immediately.
 259  */
 260
 261 void ext3_abort (struct super_block * sb, const char * function,
 262                  const char * fmt, ...)
 263 {
 264         va_list args;
 265
 266         printk (KERN_CRIT "ext3_abort called.\n");
 267
 268         va_start(args, fmt);
 269         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 270         vprintk(fmt, args);
 271         printk("\n");
 272         va_end(args);
 273
 274         if (test_opt(sb, ERRORS_PANIC))
 275                 panic("EXT3-fs panic from previous error\n");
 276
 277         if (sb->s_flags & MS_RDONLY)
 278                 return;
 279
 280         printk(KERN_CRIT "Remounting filesystem read-only\n");
 281         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 282         sb->s_flags |= MS_RDONLY;
 283         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 284         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 285 }
 286
 287 void ext3_warning (struct super_block * sb, const char * function,
 288                    const char * fmt, ...)
 289 {
 290         va_list args;
 291
 292         va_start(args, fmt);
 293         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 294                sb->s_id, function);
 295         vprintk(fmt, args);
 296         printk("\n");
 297         va_end(args);
 298 }
 299
 300 void ext3_update_dynamic_rev(struct super_block *sb)
 301 {
 302         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 303
 304         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 305                 return;
 306
 307         ext3_warning(sb, __FUNCTION__,
 308                      "updating to rev %d because of new feature flag, "
 309                      "running e2fsck is recommended",
 310                      EXT3_DYNAMIC_REV);
 311
 312         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 313         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 314         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 315         /* leave es->s_feature_*compat flags alone */
 316         /* es->s_uuid will be set by e2fsck if empty */
 317
 318         /*
 319          * The rest of the superblock fields should be zero, and if not it
 320          * means they are likely already in use, so leave them alone.  We
 321          * can leave it up to e2fsck to clean up any inconsistencies there.
 322          */
 323 }
 324
 325 /*
 326  * Open the external journal device
 327  */
 328 static struct block_device *ext3_blkdev_get(dev_t dev)
 329 {
 330         struct block_device *bdev;
 331         char b[BDEVNAME_SIZE];
 332
 333         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 334         if (IS_ERR(bdev))
 335                 goto fail;
 336         return bdev;
 337
 338 fail:
 339         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 340                         __bdevname(dev, b), PTR_ERR(bdev));
 341         return NULL;
 342 }
 343
 344 /*
 345  * Release the journal device
 346  */
 347 static int ext3_blkdev_put(struct block_device *bdev)
 348 {
 349         bd_release(bdev);
 350         return blkdev_put(bdev);
 351 }
 352
 353 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 354 {
 355         struct block_device *bdev;
 356         int ret = -ENODEV;
 357
 358         bdev = sbi->journal_bdev;
 359         if (bdev) {
 360                 ret = ext3_blkdev_put(bdev);
 361                 sbi->journal_bdev = NULL;
 362         }
 363         return ret;
 364 }
 365
 366 static inline struct inode *orphan_list_entry(struct list_head *l)
 367 {
 368         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 369 }
 370
 371 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 372 {
 373         struct list_head *l;
 374
 375         printk(KERN_ERR "sb orphan head is %d\n",
 376                le32_to_cpu(sbi->s_es->s_last_orphan));
 377
 378         printk(KERN_ERR "sb_info orphan list:\n");
 379         list_for_each(l, &sbi->s_orphan) {
 380                 struct inode *inode = orphan_list_entry(l);
 381                 printk(KERN_ERR "  "
 382                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 383                        inode->i_sb->s_id, inode->i_ino, inode,
 384                        inode->i_mode, inode->i_nlink,
 385                        NEXT_ORPHAN(inode));
 386         }
 387 }
 388
 389 static void ext3_put_super (struct super_block * sb)
 390 {
 391         struct ext3_sb_info *sbi = EXT3_SB(sb);
 392         struct ext3_super_block *es = sbi->s_es;
 393         int i;
 394
 395         ext3_xattr_put_super(sb);
 396         journal_destroy(sbi->s_journal);
 397         if (!(sb->s_flags & MS_RDONLY)) {
 398                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 399                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 400                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 401                 mark_buffer_dirty(sbi->s_sbh);
 402                 ext3_commit_super(sb, es, 1);
 403         }
 404
 405         for (i = 0; i < sbi->s_gdb_count; i++)
 406                 brelse(sbi->s_group_desc[i]);
 407         kfree(sbi->s_group_desc);
 408         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 409         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 410         percpu_counter_destroy(&sbi->s_dirs_counter);
 411         brelse(sbi->s_sbh);
 412 #ifdef CONFIG_QUOTA
 413         for (i = 0; i < MAXQUOTAS; i++)
 414                 kfree(sbi->s_qf_names[i]);
 415 #endif
 416
 417         /* Debugging code just in case the in-memory inode orphan list
 418          * isn't empty.  The on-disk one can be non-empty if we've
 419          * detected an error and taken the fs readonly, but the
 420          * in-memory list had better be clean by this point. */
 421         if (!list_empty(&sbi->s_orphan))
 422                 dump_orphan_list(sb, sbi);
 423         J_ASSERT(list_empty(&sbi->s_orphan));
 424
 425         invalidate_bdev(sb->s_bdev);
 426         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 427                 /*
 428                  * Invalidate the journal device's buffers.  We don't want them
 429                  * floating about in memory - the physical journal device may
 430                  * hotswapped, and it breaks the `ro-after' testing code.
 431                  */
 432                 sync_blockdev(sbi->journal_bdev);
 433                 invalidate_bdev(sbi->journal_bdev);
 434                 ext3_blkdev_remove(sbi);
 435         }
 436         sb->s_fs_info = NULL;
 437         kfree(sbi);
 438         return;
 439 }
 440
 441 static struct kmem_cache *ext3_inode_cachep;
 442
 443 /*
 444  * Called inside transaction, so use GFP_NOFS
 445  */
 446 static struct inode *ext3_alloc_inode(struct super_block *sb)
 447 {
 448         struct ext3_inode_info *ei;
 449
 450         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 451         if (!ei)
 452                 return NULL;
 453 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 454         ei->i_acl = EXT3_ACL_NOT_CACHED;
 455         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 456 #endif
 457         ei->i_block_alloc_info = NULL;
 458         ei->vfs_inode.i_version = 1;
 459         return &ei->vfs_inode;
 460 }
 461
 462 static void ext3_destroy_inode(struct inode *inode)
 463 {
 464         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 465                 printk("EXT3 Inode %p: orphan list check failed!\n",
 466                         EXT3_I(inode));
 467                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 468                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 469                                 false);
 470                 dump_stack();
 471         }
 472         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 473 }
 474
 475 static void init_once(struct kmem_cache * cachep, void *foo)
 476 {
 477         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 478
 479         INIT_LIST_HEAD(&ei->i_orphan);
 480 #ifdef CONFIG_EXT3_FS_XATTR
 481         init_rwsem(&ei->xattr_sem);
 482 #endif
 483         mutex_init(&ei->truncate_mutex);
 484         inode_init_once(&ei->vfs_inode);
 485 }
 486
 487 static int init_inodecache(void)
 488 {
 489         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 490                                              sizeof(struct ext3_inode_info),
 491                                              0, (SLAB_RECLAIM_ACCOUNT|
 492                                                 SLAB_MEM_SPREAD),
 493                                              init_once);
 494         if (ext3_inode_cachep == NULL)
 495                 return -ENOMEM;
 496         return 0;
 497 }
 498
 499 static void destroy_inodecache(void)
 500 {
 501         kmem_cache_destroy(ext3_inode_cachep);
 502 }
 503
 504 static void ext3_clear_inode(struct inode *inode)
 505 {
 506         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 507 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 508         if (EXT3_I(inode)->i_acl &&
 509                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 510                 posix_acl_release(EXT3_I(inode)->i_acl);
 511                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 512         }
 513         if (EXT3_I(inode)->i_default_acl &&
 514                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 515                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 516                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 517         }
 518 #endif
 519         ext3_discard_reservation(inode);
 520         EXT3_I(inode)->i_block_alloc_info = NULL;
 521         if (unlikely(rsv))
 522                 kfree(rsv);
 523 }
 524
 525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 526 {
 527 #if defined(CONFIG_QUOTA)
 528         struct ext3_sb_info *sbi = EXT3_SB(sb);
 529
 530         if (sbi->s_jquota_fmt)
 531                 seq_printf(seq, ",jqfmt=%s",
 532                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 533
 534         if (sbi->s_qf_names[USRQUOTA])
 535                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 536
 537         if (sbi->s_qf_names[GRPQUOTA])
 538                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 539
 540         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 541                 seq_puts(seq, ",usrquota");
 542
 543         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 544                 seq_puts(seq, ",grpquota");
 545 #endif
 546 }
 547
 548 /*
 549  * Show an option if
 550  *  - it's set to a non-default value OR
 551  *  - if the per-sb default is different from the global default
 552  */
 553 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 554 {
 555         struct super_block *sb = vfs->mnt_sb;
 556         struct ext3_sb_info *sbi = EXT3_SB(sb);
 557         struct ext3_super_block *es = sbi->s_es;
 558         unsigned long def_mount_opts;
 559
 560         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 561
 562         if (sbi->s_sb_block != 1)
 563                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 564         if (test_opt(sb, MINIX_DF))
 565                 seq_puts(seq, ",minixdf");
 566         if (test_opt(sb, GRPID))
 567                 seq_puts(seq, ",grpid");
 568         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 569                 seq_puts(seq, ",nogrpid");
 570         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 571             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 572                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 573         }
 574         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 575             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 576                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 577         }
 578         if (test_opt(sb, ERRORS_CONT)) {
 579                 int def_errors = le16_to_cpu(es->s_errors);
 580
 581                 if (def_errors == EXT3_ERRORS_PANIC ||
 582                     def_errors == EXT3_ERRORS_RO) {
 583                         seq_puts(seq, ",errors=continue");
 584                 }
 585         }
 586         if (test_opt(sb, ERRORS_RO))
 587                 seq_puts(seq, ",errors=remount-ro");
 588         if (test_opt(sb, ERRORS_PANIC))
 589                 seq_puts(seq, ",errors=panic");
 590         if (test_opt(sb, NO_UID32))
 591                 seq_puts(seq, ",nouid32");
 592         if (test_opt(sb, DEBUG))
 593                 seq_puts(seq, ",debug");
 594         if (test_opt(sb, OLDALLOC))
 595                 seq_puts(seq, ",oldalloc");
 596 #ifdef CONFIG_EXT3_FS_XATTR
 597         if (test_opt(sb, XATTR_USER))
 598                 seq_puts(seq, ",user_xattr");
 599         if (!test_opt(sb, XATTR_USER) &&
 600             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 601                 seq_puts(seq, ",nouser_xattr");
 602         }
 603 #endif
 604 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 605         if (test_opt(sb, POSIX_ACL))
 606                 seq_puts(seq, ",acl");
 607         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 608                 seq_puts(seq, ",noacl");
 609 #endif
 610         if (!test_opt(sb, RESERVATION))
 611                 seq_puts(seq, ",noreservation");
 612         if (sbi->s_commit_interval) {
 613                 seq_printf(seq, ",commit=%u",
 614                            (unsigned) (sbi->s_commit_interval / HZ));
 615         }
 616         if (test_opt(sb, BARRIER))
 617                 seq_puts(seq, ",barrier=1");
 618         if (test_opt(sb, NOBH))
 619                 seq_puts(seq, ",nobh");
 620
 621         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 622                 seq_puts(seq, ",data=journal");
 623         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 624                 seq_puts(seq, ",data=ordered");
 625         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 626                 seq_puts(seq, ",data=writeback");
 627
 628         ext3_show_quota_options(seq, sb);
 629
 630         return 0;
 631 }
 632
 633
 634 static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
 635 {
 636         __u32 *objp = vobjp;
 637         unsigned long ino = objp[0];
 638         __u32 generation = objp[1];
 639         struct inode *inode;
 640         struct dentry *result;
 641
 642         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 643                 return ERR_PTR(-ESTALE);
 644         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 645                 return ERR_PTR(-ESTALE);
 646
 647         /* iget isn't really right if the inode is currently unallocated!!
 648          *
 649          * ext3_read_inode will return a bad_inode if the inode had been
 650          * deleted, so we should be safe.
 651          *
 652          * Currently we don't know the generation for parent directory, so
 653          * a generation of 0 means "accept any"
 654          */
 655         inode = iget(sb, ino);
 656         if (inode == NULL)
 657                 return ERR_PTR(-ENOMEM);
 658         if (is_bad_inode(inode) ||
 659             (generation && inode->i_generation != generation)) {
 660                 iput(inode);
 661                 return ERR_PTR(-ESTALE);
 662         }
 663         /* now to find a dentry.
 664          * If possible, get a well-connected one
 665          */
 666         result = d_alloc_anon(inode);
 667         if (!result) {
 668                 iput(inode);
 669                 return ERR_PTR(-ENOMEM);
 670         }
 671         return result;
 672 }
 673
 674 #ifdef CONFIG_QUOTA
 675 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 676 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 677
 678 static int ext3_dquot_initialize(struct inode *inode, int type);
 679 static int ext3_dquot_drop(struct inode *inode);
 680 static int ext3_write_dquot(struct dquot *dquot);
 681 static int ext3_acquire_dquot(struct dquot *dquot);
 682 static int ext3_release_dquot(struct dquot *dquot);
 683 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 684 static int ext3_write_info(struct super_block *sb, int type);
 685 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
 686 static int ext3_quota_on_mount(struct super_block *sb, int type);
 687 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 688                                size_t len, loff_t off);
 689 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 690                                 const char *data, size_t len, loff_t off);
 691
 692 static struct dquot_operations ext3_quota_operations = {
 693         .initialize     = ext3_dquot_initialize,
 694         .drop           = ext3_dquot_drop,
 695         .alloc_space    = dquot_alloc_space,
 696         .alloc_inode    = dquot_alloc_inode,
 697         .free_space     = dquot_free_space,
 698         .free_inode     = dquot_free_inode,
 699         .transfer       = dquot_transfer,
 700         .write_dquot    = ext3_write_dquot,
 701         .acquire_dquot  = ext3_acquire_dquot,
 702         .release_dquot  = ext3_release_dquot,
 703         .mark_dirty     = ext3_mark_dquot_dirty,
 704         .write_info     = ext3_write_info
 705 };
 706
 707 static struct quotactl_ops ext3_qctl_operations = {
 708         .quota_on       = ext3_quota_on,
 709         .quota_off      = vfs_quota_off,
 710         .quota_sync     = vfs_quota_sync,
 711         .get_info       = vfs_get_dqinfo,
 712         .set_info       = vfs_set_dqinfo,
 713         .get_dqblk      = vfs_get_dqblk,
 714         .set_dqblk      = vfs_set_dqblk
 715 };
 716 #endif
 717
 718 static const struct super_operations ext3_sops = {
 719         .alloc_inode    = ext3_alloc_inode,
 720         .destroy_inode  = ext3_destroy_inode,
 721         .read_inode     = ext3_read_inode,
 722         .write_inode    = ext3_write_inode,
 723         .dirty_inode    = ext3_dirty_inode,
 724         .delete_inode   = ext3_delete_inode,
 725         .put_super      = ext3_put_super,
 726         .write_super    = ext3_write_super,
 727         .sync_fs        = ext3_sync_fs,
 728         .write_super_lockfs = ext3_write_super_lockfs,
 729         .unlockfs       = ext3_unlockfs,
 730         .statfs         = ext3_statfs,
 731         .remount_fs     = ext3_remount,
 732         .clear_inode    = ext3_clear_inode,
 733         .show_options   = ext3_show_options,
 734 #ifdef CONFIG_QUOTA
 735         .quota_read     = ext3_quota_read,
 736         .quota_write    = ext3_quota_write,
 737 #endif
 738 };
 739
 740 static struct export_operations ext3_export_ops = {
 741         .get_parent = ext3_get_parent,
 742         .get_dentry = ext3_get_dentry,
 743 };
 744
 745 enum {
 746         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 747         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 748         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 749         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 750         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 751         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 752         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 753         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 754         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 755         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 756         Opt_grpquota
 757 };
 758
 759 static match_table_t tokens = {
 760         {Opt_bsd_df, "bsddf"},
 761         {Opt_minix_df, "minixdf"},
 762         {Opt_grpid, "grpid"},
 763         {Opt_grpid, "bsdgroups"},
 764         {Opt_nogrpid, "nogrpid"},
 765         {Opt_nogrpid, "sysvgroups"},
 766         {Opt_resgid, "resgid=%u"},
 767         {Opt_resuid, "resuid=%u"},
 768         {Opt_sb, "sb=%u"},
 769         {Opt_err_cont, "errors=continue"},
 770         {Opt_err_panic, "errors=panic"},
 771         {Opt_err_ro, "errors=remount-ro"},
 772         {Opt_nouid32, "nouid32"},
 773         {Opt_nocheck, "nocheck"},
 774         {Opt_nocheck, "check=none"},
 775         {Opt_debug, "debug"},
 776         {Opt_oldalloc, "oldalloc"},
 777         {Opt_orlov, "orlov"},
 778         {Opt_user_xattr, "user_xattr"},
 779         {Opt_nouser_xattr, "nouser_xattr"},
 780         {Opt_acl, "acl"},
 781         {Opt_noacl, "noacl"},
 782         {Opt_reservation, "reservation"},
 783         {Opt_noreservation, "noreservation"},
 784         {Opt_noload, "noload"},
 785         {Opt_nobh, "nobh"},
 786         {Opt_bh, "bh"},
 787         {Opt_commit, "commit=%u"},
 788         {Opt_journal_update, "journal=update"},
 789         {Opt_journal_inum, "journal=%u"},
 790         {Opt_journal_dev, "journal_dev=%u"},
 791         {Opt_abort, "abort"},
 792         {Opt_data_journal, "data=journal"},
 793         {Opt_data_ordered, "data=ordered"},
 794         {Opt_data_writeback, "data=writeback"},
 795         {Opt_offusrjquota, "usrjquota="},
 796         {Opt_usrjquota, "usrjquota=%s"},
 797         {Opt_offgrpjquota, "grpjquota="},
 798         {Opt_grpjquota, "grpjquota=%s"},
 799         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 800         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 801         {Opt_grpquota, "grpquota"},
 802         {Opt_noquota, "noquota"},
 803         {Opt_quota, "quota"},
 804         {Opt_usrquota, "usrquota"},
 805         {Opt_barrier, "barrier=%u"},
 806         {Opt_err, NULL},
 807         {Opt_resize, "resize"},
 808 };
 809
 810 static ext3_fsblk_t get_sb_block(void **data)
 811 {
 812         ext3_fsblk_t    sb_block;
 813         char            *options = (char *) *data;
 814
 815         if (!options || strncmp(options, "sb=", 3) != 0)
 816                 return 1;       /* Default location */
 817         options += 3;
 818         /*todo: use simple_strtoll with >32bit ext3 */
 819         sb_block = simple_strtoul(options, &options, 0);
 820         if (*options && *options != ',') {
 821                 printk("EXT3-fs: Invalid sb specification: %s\n",
 822                        (char *) *data);
 823                 return 1;
 824         }
 825         if (*options == ',')
 826                 options++;
 827         *data = (void *) options;
 828         return sb_block;
 829 }
 830
 831 static int parse_options (char *options, struct super_block *sb,
 832                           unsigned int *inum, unsigned long *journal_devnum,
 833                           ext3_fsblk_t *n_blocks_count, int is_remount)
 834 {
 835         struct ext3_sb_info *sbi = EXT3_SB(sb);
 836         char * p;
 837         substring_t args[MAX_OPT_ARGS];
 838         int data_opt = 0;
 839         int option;
 840 #ifdef CONFIG_QUOTA
 841         int qtype;
 842         char *qname;
 843 #endif
 844
 845         if (!options)
 846                 return 1;
 847
 848         while ((p = strsep (&options, ",")) != NULL) {
 849                 int token;
 850                 if (!*p)
 851                         continue;
 852
 853                 token = match_token(p, tokens, args);
 854                 switch (token) {
 855                 case Opt_bsd_df:
 856                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 857                         break;
 858                 case Opt_minix_df:
 859                         set_opt (sbi->s_mount_opt, MINIX_DF);
 860                         break;
 861                 case Opt_grpid:
 862                         set_opt (sbi->s_mount_opt, GRPID);
 863                         break;
 864                 case Opt_nogrpid:
 865                         clear_opt (sbi->s_mount_opt, GRPID);
 866                         break;
 867                 case Opt_resuid:
 868                         if (match_int(&args[0], &option))
 869                                 return 0;
 870                         sbi->s_resuid = option;
 871                         break;
 872                 case Opt_resgid:
 873                         if (match_int(&args[0], &option))
 874                                 return 0;
 875                         sbi->s_resgid = option;
 876                         break;
 877                 case Opt_sb:
 878                         /* handled by get_sb_block() instead of here */
 879                         /* *sb_block = match_int(&args[0]); */
 880                         break;
 881                 case Opt_err_panic:
 882                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 883                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 884                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 885                         break;
 886                 case Opt_err_ro:
 887                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 888                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 889                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 890                         break;
 891                 case Opt_err_cont:
 892                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 893                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 894                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 895                         break;
 896                 case Opt_nouid32:
 897                         set_opt (sbi->s_mount_opt, NO_UID32);
 898                         break;
 899                 case Opt_nocheck:
 900                         clear_opt (sbi->s_mount_opt, CHECK);
 901                         break;
 902                 case Opt_debug:
 903                         set_opt (sbi->s_mount_opt, DEBUG);
 904                         break;
 905                 case Opt_oldalloc:
 906                         set_opt (sbi->s_mount_opt, OLDALLOC);
 907                         break;
 908                 case Opt_orlov:
 909                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 910                         break;
 911 #ifdef CONFIG_EXT3_FS_XATTR
 912                 case Opt_user_xattr:
 913                         set_opt (sbi->s_mount_opt, XATTR_USER);
 914                         break;
 915                 case Opt_nouser_xattr:
 916                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 917                         break;
 918 #else
 919                 case Opt_user_xattr:
 920                 case Opt_nouser_xattr:
 921                         printk("EXT3 (no)user_xattr options not supported\n");
 922                         break;
 923 #endif
 924 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 925                 case Opt_acl:
 926                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 927                         break;
 928                 case Opt_noacl:
 929                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 930                         break;
 931 #else
 932                 case Opt_acl:
 933                 case Opt_noacl:
 934                         printk("EXT3 (no)acl options not supported\n");
 935                         break;
 936 #endif
 937                 case Opt_reservation:
 938                         set_opt(sbi->s_mount_opt, RESERVATION);
 939                         break;
 940                 case Opt_noreservation:
 941                         clear_opt(sbi->s_mount_opt, RESERVATION);
 942                         break;
 943                 case Opt_journal_update:
 944                         /* @@@ FIXME */
 945                         /* Eventually we will want to be able to create
 946                            a journal file here.  For now, only allow the
 947                            user to specify an existing inode to be the
 948                            journal file. */
 949                         if (is_remount) {
 950                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 951                                        "journal on remount\n");
 952                                 return 0;
 953                         }
 954                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 955                         break;
 956                 case Opt_journal_inum:
 957                         if (is_remount) {
 958                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 959                                        "journal on remount\n");
 960                                 return 0;
 961                         }
 962                         if (match_int(&args[0], &option))
 963                                 return 0;
 964                         *inum = option;
 965                         break;
 966                 case Opt_journal_dev:
 967                         if (is_remount) {
 968                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 969                                        "journal on remount\n");
 970                                 return 0;
 971                         }
 972                         if (match_int(&args[0], &option))
 973                                 return 0;
 974                         *journal_devnum = option;
 975                         break;
 976                 case Opt_noload:
 977                         set_opt (sbi->s_mount_opt, NOLOAD);
 978                         break;
 979                 case Opt_commit:
 980                         if (match_int(&args[0], &option))
 981                                 return 0;
 982                         if (option < 0)
 983                                 return 0;
 984                         if (option == 0)
 985                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 986                         sbi->s_commit_interval = HZ * option;
 987                         break;
 988                 case Opt_data_journal:
 989                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
 990                         goto datacheck;
 991                 case Opt_data_ordered:
 992                         data_opt = EXT3_MOUNT_ORDERED_DATA;
 993                         goto datacheck;
 994                 case Opt_data_writeback:
 995                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
 996                 datacheck:
 997                         if (is_remount) {
 998                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
 999                                                 != data_opt) {
1000                                         printk(KERN_ERR
1001                                                 "EXT3-fs: cannot change data "
1002                                                 "mode on remount\n");
1003                                         return 0;
1004                                 }
1005                         } else {
1006                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1007                                 sbi->s_mount_opt |= data_opt;
1008                         }
1009                         break;
1010 #ifdef CONFIG_QUOTA
1011                 case Opt_usrjquota:
1012                         qtype = USRQUOTA;
1013                         goto set_qf_name;
1014                 case Opt_grpjquota:
1015                         qtype = GRPQUOTA;
1016 set_qf_name:
1017                         if (sb_any_quota_enabled(sb)) {
1018                                 printk(KERN_ERR
1019                                         "EXT3-fs: Cannot change journalled "
1020                                         "quota options when quota turned on.\n");
1021                                 return 0;
1022                         }
1023                         qname = match_strdup(&args[0]);
1024                         if (!qname) {
1025                                 printk(KERN_ERR
1026                                         "EXT3-fs: not enough memory for "
1027                                         "storing quotafile name.\n");
1028                                 return 0;
1029                         }
1030                         if (sbi->s_qf_names[qtype] &&
1031                             strcmp(sbi->s_qf_names[qtype], qname)) {
1032                                 printk(KERN_ERR
1033                                         "EXT3-fs: %s quota file already "
1034                                         "specified.\n", QTYPE2NAME(qtype));
1035                                 kfree(qname);
1036                                 return 0;
1037                         }
1038                         sbi->s_qf_names[qtype] = qname;
1039                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1040                                 printk(KERN_ERR
1041                                         "EXT3-fs: quotafile must be on "
1042                                         "filesystem root.\n");
1043                                 kfree(sbi->s_qf_names[qtype]);
1044                                 sbi->s_qf_names[qtype] = NULL;
1045                                 return 0;
1046                         }
1047                         set_opt(sbi->s_mount_opt, QUOTA);
1048                         break;
1049                 case Opt_offusrjquota:
1050                         qtype = USRQUOTA;
1051                         goto clear_qf_name;
1052                 case Opt_offgrpjquota:
1053                         qtype = GRPQUOTA;
1054 clear_qf_name:
1055                         if (sb_any_quota_enabled(sb)) {
1056                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1057                                         "journalled quota options when "
1058                                         "quota turned on.\n");
1059                                 return 0;
1060                         }
1061                         /*
1062                          * The space will be released later when all options
1063                          * are confirmed to be correct
1064                          */
1065                         sbi->s_qf_names[qtype] = NULL;
1066                         break;
1067                 case Opt_jqfmt_vfsold:
1068                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
1069                         break;
1070                 case Opt_jqfmt_vfsv0:
1071                         sbi->s_jquota_fmt = QFMT_VFS_V0;
1072                         break;
1073                 case Opt_quota:
1074                 case Opt_usrquota:
1075                         set_opt(sbi->s_mount_opt, QUOTA);
1076                         set_opt(sbi->s_mount_opt, USRQUOTA);
1077                         break;
1078                 case Opt_grpquota:
1079                         set_opt(sbi->s_mount_opt, QUOTA);
1080                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1081                         break;
1082                 case Opt_noquota:
1083                         if (sb_any_quota_enabled(sb)) {
1084                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1085                                         "options when quota turned on.\n");
1086                                 return 0;
1087                         }
1088                         clear_opt(sbi->s_mount_opt, QUOTA);
1089                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1090                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1091                         break;
1092 #else
1093                 case Opt_quota:
1094                 case Opt_usrquota:
1095                 case Opt_grpquota:
1096                 case Opt_usrjquota:
1097                 case Opt_grpjquota:
1098                 case Opt_offusrjquota:
1099                 case Opt_offgrpjquota:
1100                 case Opt_jqfmt_vfsold:
1101                 case Opt_jqfmt_vfsv0:
1102                         printk(KERN_ERR
1103                                 "EXT3-fs: journalled quota options not "
1104                                 "supported.\n");
1105                         break;
1106                 case Opt_noquota:
1107                         break;
1108 #endif
1109                 case Opt_abort:
1110                         set_opt(sbi->s_mount_opt, ABORT);
1111                         break;
1112                 case Opt_barrier:
1113                         if (match_int(&args[0], &option))
1114                                 return 0;
1115                         if (option)
1116                                 set_opt(sbi->s_mount_opt, BARRIER);
1117                         else
1118                                 clear_opt(sbi->s_mount_opt, BARRIER);
1119                         break;
1120                 case Opt_ignore:
1121                         break;
1122                 case Opt_resize:
1123                         if (!is_remount) {
1124                                 printk("EXT3-fs: resize option only available "
1125                                         "for remount\n");
1126                                 return 0;
1127                         }
1128                         if (match_int(&args[0], &option) != 0)
1129                                 return 0;
1130                         *n_blocks_count = option;
1131                         break;
1132                 case Opt_nobh:
1133                         set_opt(sbi->s_mount_opt, NOBH);
1134                         break;
1135                 case Opt_bh:
1136                         clear_opt(sbi->s_mount_opt, NOBH);
1137                         break;
1138                 default:
1139                         printk (KERN_ERR
1140                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1141                                 "or missing value\n", p);
1142                         return 0;
1143                 }
1144         }
1145 #ifdef CONFIG_QUOTA
1146         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1147                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1148                      sbi->s_qf_names[USRQUOTA])
1149                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1150
1151                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1152                      sbi->s_qf_names[GRPQUOTA])
1153                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1154
1155                 if ((sbi->s_qf_names[USRQUOTA] &&
1156                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1157                     (sbi->s_qf_names[GRPQUOTA] &&
1158                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1159                         printk(KERN_ERR "EXT3-fs: old and new quota "
1160                                         "format mixing.\n");
1161                         return 0;
1162                 }
1163
1164                 if (!sbi->s_jquota_fmt) {
1165                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1166                                         "not specified.\n");
1167                         return 0;
1168                 }
1169         } else {
1170                 if (sbi->s_jquota_fmt) {
1171                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1172                                         "specified with no journalling "
1173                                         "enabled.\n");
1174                         return 0;
1175                 }
1176         }
1177 #endif
1178         return 1;
1179 }
1180
1181 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1182                             int read_only)
1183 {
1184         struct ext3_sb_info *sbi = EXT3_SB(sb);
1185         int res = 0;
1186
1187         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1188                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1189                         "forcing read-only mode\n");
1190                 res = MS_RDONLY;
1191         }
1192         if (read_only)
1193                 return res;
1194         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1195                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1196                         "running e2fsck is recommended\n");
1197         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1198                 printk (KERN_WARNING
1199                         "EXT3-fs warning: mounting fs with errors, "
1200                         "running e2fsck is recommended\n");
1201         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1202                  le16_to_cpu(es->s_mnt_count) >=
1203                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1204                 printk (KERN_WARNING
1205                         "EXT3-fs warning: maximal mount count reached, "
1206                         "running e2fsck is recommended\n");
1207         else if (le32_to_cpu(es->s_checkinterval) &&
1208                 (le32_to_cpu(es->s_lastcheck) +
1209                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1210                 printk (KERN_WARNING
1211                         "EXT3-fs warning: checktime reached, "
1212                         "running e2fsck is recommended\n");
1213 #if 0
1214                 /* @@@ We _will_ want to clear the valid bit if we find
1215                    inconsistencies, to force a fsck at reboot.  But for
1216                    a plain journaled filesystem we can keep it set as
1217                    valid forever! :) */
1218         es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1219 #endif
1220         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1221                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1222         es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1223         es->s_mtime = cpu_to_le32(get_seconds());
1224         ext3_update_dynamic_rev(sb);
1225         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1226
1227         ext3_commit_super(sb, es, 1);
1228         if (test_opt(sb, DEBUG))
1229                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1230                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1231                         sb->s_blocksize,
1232                         sbi->s_groups_count,
1233                         EXT3_BLOCKS_PER_GROUP(sb),
1234                         EXT3_INODES_PER_GROUP(sb),
1235                         sbi->s_mount_opt);
1236
1237         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1238         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1239                 char b[BDEVNAME_SIZE];
1240
1241                 printk("external journal on %s\n",
1242                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1243         } else {
1244                 printk("internal journal\n");
1245         }
1246         return res;
1247 }
1248
1249 /* Called at mount-time, super-block is locked */
1250 static int ext3_check_descriptors (struct super_block * sb)
1251 {
1252         struct ext3_sb_info *sbi = EXT3_SB(sb);
1253         ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1254         ext3_fsblk_t last_block;
1255         struct ext3_group_desc * gdp = NULL;
1256         int desc_block = 0;
1257         int i;
1258
1259         ext3_debug ("Checking group descriptors");
1260
1261         for (i = 0; i < sbi->s_groups_count; i++)
1262         {
1263                 if (i == sbi->s_groups_count - 1)
1264                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1265                 else
1266                         last_block = first_block +
1267                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1268
1269                 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1270                         gdp = (struct ext3_group_desc *)
1271                                         sbi->s_group_desc[desc_block++]->b_data;
1272                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1273                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1274                 {
1275                         ext3_error (sb, "ext3_check_descriptors",
1276                                     "Block bitmap for group %d"
1277                                     " not in group (block %lu)!",
1278                                     i, (unsigned long)
1279                                         le32_to_cpu(gdp->bg_block_bitmap));
1280                         return 0;
1281                 }
1282                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1283                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1284                 {
1285                         ext3_error (sb, "ext3_check_descriptors",
1286                                     "Inode bitmap for group %d"
1287                                     " not in group (block %lu)!",
1288                                     i, (unsigned long)
1289                                         le32_to_cpu(gdp->bg_inode_bitmap));
1290                         return 0;
1291                 }
1292                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1293                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1294                     last_block)
1295                 {
1296                         ext3_error (sb, "ext3_check_descriptors",
1297                                     "Inode table for group %d"
1298                                     " not in group (block %lu)!",
1299                                     i, (unsigned long)
1300                                         le32_to_cpu(gdp->bg_inode_table));
1301                         return 0;
1302                 }
1303                 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1304                 gdp++;
1305         }
1306
1307         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1308         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1309         return 1;
1310 }
1311
1312
1313 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1314  * the superblock) which were deleted from all directories, but held open by
1315  * a process at the time of a crash.  We walk the list and try to delete these
1316  * inodes at recovery time (only with a read-write filesystem).
1317  *
1318  * In order to keep the orphan inode chain consistent during traversal (in
1319  * case of crash during recovery), we link each inode into the superblock
1320  * orphan list_head and handle it the same way as an inode deletion during
1321  * normal operation (which journals the operations for us).
1322  *
1323  * We only do an iget() and an iput() on each inode, which is very safe if we
1324  * accidentally point at an in-use or already deleted inode.  The worst that
1325  * can happen in this case is that we get a "bit already cleared" message from
1326  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1327  * e2fsck was run on this filesystem, and it must have already done the orphan
1328  * inode cleanup for us, so we can safely abort without any further action.
1329  */
1330 static void ext3_orphan_cleanup (struct super_block * sb,
1331                                  struct ext3_super_block * es)
1332 {
1333         unsigned int s_flags = sb->s_flags;
1334         int nr_orphans = 0, nr_truncates = 0;
1335 #ifdef CONFIG_QUOTA
1336         int i;
1337 #endif
1338         if (!es->s_last_orphan) {
1339                 jbd_debug(4, "no orphan inodes to clean up\n");
1340                 return;
1341         }
1342
1343         if (bdev_read_only(sb->s_bdev)) {
1344                 printk(KERN_ERR "EXT3-fs: write access "
1345                         "unavailable, skipping orphan cleanup.\n");
1346                 return;
1347         }
1348
1349         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1350                 if (es->s_last_orphan)
1351                         jbd_debug(1, "Errors on filesystem, "
1352                                   "clearing orphan list.\n");
1353                 es->s_last_orphan = 0;
1354                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1355                 return;
1356         }
1357
1358         if (s_flags & MS_RDONLY) {
1359                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1360                        sb->s_id);
1361                 sb->s_flags &= ~MS_RDONLY;
1362         }
1363 #ifdef CONFIG_QUOTA
1364         /* Needed for iput() to work correctly and not trash data */
1365         sb->s_flags |= MS_ACTIVE;
1366         /* Turn on quotas so that they are updated correctly */
1367         for (i = 0; i < MAXQUOTAS; i++) {
1368                 if (EXT3_SB(sb)->s_qf_names[i]) {
1369                         int ret = ext3_quota_on_mount(sb, i);
1370                         if (ret < 0)
1371                                 printk(KERN_ERR
1372                                         "EXT3-fs: Cannot turn on journalled "
1373                                         "quota: error %d\n", ret);
1374                 }
1375         }
1376 #endif
1377
1378         while (es->s_last_orphan) {
1379                 struct inode *inode;
1380
1381                 if (!(inode =
1382                       ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1383                         es->s_last_orphan = 0;
1384                         break;
1385                 }
1386
1387                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1388                 DQUOT_INIT(inode);
1389                 if (inode->i_nlink) {
1390                         printk(KERN_DEBUG
1391                                 "%s: truncating inode %lu to %Ld bytes\n",
1392                                 __FUNCTION__, inode->i_ino, inode->i_size);
1393                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1394                                   inode->i_ino, inode->i_size);
1395                         ext3_truncate(inode);
1396                         nr_truncates++;
1397                 } else {
1398                         printk(KERN_DEBUG
1399                                 "%s: deleting unreferenced inode %lu\n",
1400                                 __FUNCTION__, inode->i_ino);
1401                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1402                                   inode->i_ino);
1403                         nr_orphans++;
1404                 }
1405                 iput(inode);  /* The delete magic happens here! */
1406         }
1407
1408 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1409
1410         if (nr_orphans)
1411                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1412                        sb->s_id, PLURAL(nr_orphans));
1413         if (nr_truncates)
1414                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1415                        sb->s_id, PLURAL(nr_truncates));
1416 #ifdef CONFIG_QUOTA
1417         /* Turn quotas off */
1418         for (i = 0; i < MAXQUOTAS; i++) {
1419                 if (sb_dqopt(sb)->files[i])
1420                         vfs_quota_off(sb, i);
1421         }
1422 #endif
1423         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1424 }
1425
1426 /*
1427  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1428  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1429  * We need to be 1 filesystem block less than the 2^32 sector limit.
1430  */
1431 static loff_t ext3_max_size(int bits)
1432 {
1433         loff_t res = EXT3_NDIR_BLOCKS;
1434         /* This constant is calculated to be the largest file size for a
1435          * dense, 4k-blocksize file such that the total number of
1436          * sectors in the file, including data and all indirect blocks,
1437          * does not exceed 2^32. */
1438         const loff_t upper_limit = 0x1ff7fffd000LL;
1439
1440         res += 1LL << (bits-2);
1441         res += 1LL << (2*(bits-2));
1442         res += 1LL << (3*(bits-2));
1443         res <<= bits;
1444         if (res > upper_limit)
1445                 res = upper_limit;
1446         return res;
1447 }
1448
1449 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1450                                     ext3_fsblk_t logic_sb_block,
1451                                     int nr)
1452 {
1453         struct ext3_sb_info *sbi = EXT3_SB(sb);
1454         unsigned long bg, first_meta_bg;
1455         int has_super = 0;
1456
1457         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1458
1459         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1460             nr < first_meta_bg)
1461                 return (logic_sb_block + nr + 1);
1462         bg = sbi->s_desc_per_block * nr;
1463         if (ext3_bg_has_super(sb, bg))
1464                 has_super = 1;
1465         return (has_super + ext3_group_first_block_no(sb, bg));
1466 }
1467
1468
1469 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1470 {
1471         struct buffer_head * bh;
1472         struct ext3_super_block *es = NULL;
1473         struct ext3_sb_info *sbi;
1474         ext3_fsblk_t block;
1475         ext3_fsblk_t sb_block = get_sb_block(&data);
1476         ext3_fsblk_t logic_sb_block;
1477         unsigned long offset = 0;
1478         unsigned int journal_inum = 0;
1479         unsigned long journal_devnum = 0;
1480         unsigned long def_mount_opts;
1481         struct inode *root;
1482         int blocksize;
1483         int hblock;
1484         int db_count;
1485         int i;
1486         int needs_recovery;
1487         __le32 features;
1488         int err;
1489
1490         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1491         if (!sbi)
1492                 return -ENOMEM;
1493         sb->s_fs_info = sbi;
1494         sbi->s_mount_opt = 0;
1495         sbi->s_resuid = EXT3_DEF_RESUID;
1496         sbi->s_resgid = EXT3_DEF_RESGID;
1497         sbi->s_sb_block = sb_block;
1498
1499         unlock_kernel();
1500
1501         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1502         if (!blocksize) {
1503                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1504                 goto out_fail;
1505         }
1506
1507         /*
1508          * The ext3 superblock will not be buffer aligned for other than 1kB
1509          * block sizes.  We need to calculate the offset from buffer start.
1510          */
1511         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1512                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1513                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1514         } else {
1515                 logic_sb_block = sb_block;
1516         }
1517
1518         if (!(bh = sb_bread(sb, logic_sb_block))) {
1519                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1520                 goto out_fail;
1521         }
1522         /*
1523          * Note: s_es must be initialized as soon as possible because
1524          *       some ext3 macro-instructions depend on its value
1525          */
1526         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1527         sbi->s_es = es;
1528         sb->s_magic = le16_to_cpu(es->s_magic);
1529         if (sb->s_magic != EXT3_SUPER_MAGIC)
1530                 goto cantfind_ext3;
1531
1532         /* Set defaults before we parse the mount options */
1533         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1534         if (def_mount_opts & EXT3_DEFM_DEBUG)
1535                 set_opt(sbi->s_mount_opt, DEBUG);
1536         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1537                 set_opt(sbi->s_mount_opt, GRPID);
1538         if (def_mount_opts & EXT3_DEFM_UID16)
1539                 set_opt(sbi->s_mount_opt, NO_UID32);
1540 #ifdef CONFIG_EXT3_FS_XATTR
1541         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1542                 set_opt(sbi->s_mount_opt, XATTR_USER);
1543 #endif
1544 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1545         if (def_mount_opts & EXT3_DEFM_ACL)
1546                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1547 #endif
1548         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1549                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1550         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1551                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1552         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1553                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1554
1555         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1556                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1557         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1558                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1559         else
1560                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1561
1562         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1563         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1564
1565         set_opt(sbi->s_mount_opt, RESERVATION);
1566
1567         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1568                             NULL, 0))
1569                 goto failed_mount;
1570
1571         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1572                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1573
1574         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1575             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1576              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1577              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1578                 printk(KERN_WARNING
1579                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1580                        "running e2fsck is recommended\n");
1581         /*
1582          * Check feature flags regardless of the revision level, since we
1583          * previously didn't change the revision level when setting the flags,
1584          * so there is a chance incompat flags are set on a rev 0 filesystem.
1585          */
1586         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1587         if (features) {
1588                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1589                        "unsupported optional features (%x).\n",
1590                        sb->s_id, le32_to_cpu(features));
1591                 goto failed_mount;
1592         }
1593         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1594         if (!(sb->s_flags & MS_RDONLY) && features) {
1595                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1596                        "unsupported optional features (%x).\n",
1597                        sb->s_id, le32_to_cpu(features));
1598                 goto failed_mount;
1599         }
1600         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1601
1602         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1603             blocksize > EXT3_MAX_BLOCK_SIZE) {
1604                 printk(KERN_ERR
1605                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1606                        blocksize, sb->s_id);
1607                 goto failed_mount;
1608         }
1609
1610         hblock = bdev_hardsect_size(sb->s_bdev);
1611         if (sb->s_blocksize != blocksize) {
1612                 /*
1613                  * Make sure the blocksize for the filesystem is larger
1614                  * than the hardware sectorsize for the machine.
1615                  */
1616                 if (blocksize < hblock) {
1617                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1618                                "device blocksize %d.\n", blocksize, hblock);
1619                         goto failed_mount;
1620                 }
1621
1622                 brelse (bh);
1623                 sb_set_blocksize(sb, blocksize);
1624                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1625                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1626                 bh = sb_bread(sb, logic_sb_block);
1627                 if (!bh) {
1628                         printk(KERN_ERR
1629                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1630                         goto failed_mount;
1631                 }
1632                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1633                 sbi->s_es = es;
1634                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1635                         printk (KERN_ERR
1636                                 "EXT3-fs: Magic mismatch, very weird !\n");
1637                         goto failed_mount;
1638                 }
1639         }
1640
1641         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1642
1643         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1644                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1645                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1646         } else {
1647                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1648                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1649                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1650                     (!is_power_of_2(sbi->s_inode_size)) ||
1651                     (sbi->s_inode_size > blocksize)) {
1652                         printk (KERN_ERR
1653                                 "EXT3-fs: unsupported inode size: %d\n",
1654                                 sbi->s_inode_size);
1655                         goto failed_mount;
1656                 }
1657         }
1658         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1659                                    le32_to_cpu(es->s_log_frag_size);
1660         if (blocksize != sbi->s_frag_size) {
1661                 printk(KERN_ERR
1662                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1663                        sbi->s_frag_size, blocksize);
1664                 goto failed_mount;
1665         }
1666         sbi->s_frags_per_block = 1;
1667         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1668         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1669         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1670         if (EXT3_INODE_SIZE(sb) == 0)
1671                 goto cantfind_ext3;
1672         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1673         if (sbi->s_inodes_per_block == 0)
1674                 goto cantfind_ext3;
1675         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1676                                         sbi->s_inodes_per_block;
1677         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1678         sbi->s_sbh = bh;
1679         sbi->s_mount_state = le16_to_cpu(es->s_state);
1680         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1681         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1682         for (i=0; i < 4; i++)
1683                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1684         sbi->s_def_hash_version = es->s_def_hash_version;
1685
1686         if (sbi->s_blocks_per_group > blocksize * 8) {
1687                 printk (KERN_ERR
1688                         "EXT3-fs: #blocks per group too big: %lu\n",
1689                         sbi->s_blocks_per_group);
1690                 goto failed_mount;
1691         }
1692         if (sbi->s_frags_per_group > blocksize * 8) {
1693                 printk (KERN_ERR
1694                         "EXT3-fs: #fragments per group too big: %lu\n",
1695                         sbi->s_frags_per_group);
1696                 goto failed_mount;
1697         }
1698         if (sbi->s_inodes_per_group > blocksize * 8) {
1699                 printk (KERN_ERR
1700                         "EXT3-fs: #inodes per group too big: %lu\n",
1701                         sbi->s_inodes_per_group);
1702                 goto failed_mount;
1703         }
1704
1705         if (le32_to_cpu(es->s_blocks_count) >
1706                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1707                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1708                         " too large to mount safely\n", sb->s_id);
1709                 if (sizeof(sector_t) < 8)
1710                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1711                                         "enabled\n");
1712                 goto failed_mount;
1713         }
1714
1715         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1716                 goto cantfind_ext3;
1717         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1718                                le32_to_cpu(es->s_first_data_block) - 1)
1719                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1720         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1721                    EXT3_DESC_PER_BLOCK(sb);
1722         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1723                                     GFP_KERNEL);
1724         if (sbi->s_group_desc == NULL) {
1725                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1726                 goto failed_mount;
1727         }
1728
1729         bgl_lock_init(&sbi->s_blockgroup_lock);
1730
1731         for (i = 0; i < db_count; i++) {
1732                 block = descriptor_loc(sb, logic_sb_block, i);
1733                 sbi->s_group_desc[i] = sb_bread(sb, block);
1734                 if (!sbi->s_group_desc[i]) {
1735                         printk (KERN_ERR "EXT3-fs: "
1736                                 "can't read group descriptor %d\n", i);
1737                         db_count = i;
1738                         goto failed_mount2;
1739                 }
1740         }
1741         if (!ext3_check_descriptors (sb)) {
1742                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1743                 goto failed_mount2;
1744         }
1745         sbi->s_gdb_count = db_count;
1746         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1747         spin_lock_init(&sbi->s_next_gen_lock);
1748
1749         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1750                         ext3_count_free_blocks(sb));
1751         if (!err) {
1752                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1753                                 ext3_count_free_inodes(sb));
1754         }
1755         if (!err) {
1756                 err = percpu_counter_init(&sbi->s_dirs_counter,
1757                                 ext3_count_dirs(sb));
1758         }
1759         if (err) {
1760                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1761                 goto failed_mount3;
1762         }
1763
1764         /* per fileystem reservation list head & lock */
1765         spin_lock_init(&sbi->s_rsv_window_lock);
1766         sbi->s_rsv_window_root = RB_ROOT;
1767         /* Add a single, static dummy reservation to the start of the
1768          * reservation window list --- it gives us a placeholder for
1769          * append-at-start-of-list which makes the allocation logic
1770          * _much_ simpler. */
1771         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1772         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1773         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1774         sbi->s_rsv_window_head.rsv_goal_size = 0;
1775         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1776
1777         /*
1778          * set up enough so that it can read an inode
1779          */
1780         sb->s_op = &ext3_sops;
1781         sb->s_export_op = &ext3_export_ops;
1782         sb->s_xattr = ext3_xattr_handlers;
1783 #ifdef CONFIG_QUOTA
1784         sb->s_qcop = &ext3_qctl_operations;
1785         sb->dq_op = &ext3_quota_operations;
1786 #endif
1787         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1788
1789         sb->s_root = NULL;
1790
1791         needs_recovery = (es->s_last_orphan != 0 ||
1792                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1793                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1794
1795         /*
1796          * The first inode we look at is the journal inode.  Don't try
1797          * root first: it may be modified in the journal!
1798          */
1799         if (!test_opt(sb, NOLOAD) &&
1800             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1801                 if (ext3_load_journal(sb, es, journal_devnum))
1802                         goto failed_mount3;
1803         } else if (journal_inum) {
1804                 if (ext3_create_journal(sb, es, journal_inum))
1805                         goto failed_mount3;
1806         } else {
1807                 if (!silent)
1808                         printk (KERN_ERR
1809                                 "ext3: No journal on filesystem on %s\n",
1810                                 sb->s_id);
1811                 goto failed_mount3;
1812         }
1813
1814         /* We have now updated the journal if required, so we can
1815          * validate the data journaling mode. */
1816         switch (test_opt(sb, DATA_FLAGS)) {
1817         case 0:
1818                 /* No mode set, assume a default based on the journal
1819                    capabilities: ORDERED_DATA if the journal can
1820                    cope, else JOURNAL_DATA */
1821                 if (journal_check_available_features
1822                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1823                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1824                 else
1825                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1826                 break;
1827
1828         case EXT3_MOUNT_ORDERED_DATA:
1829         case EXT3_MOUNT_WRITEBACK_DATA:
1830                 if (!journal_check_available_features
1831                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1832                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1833                                "requested data journaling mode\n");
1834                         goto failed_mount4;
1835                 }
1836         default:
1837                 break;
1838         }
1839
1840         if (test_opt(sb, NOBH)) {
1841                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1842                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1843                                 "its supported only with writeback mode\n");
1844                         clear_opt(sbi->s_mount_opt, NOBH);
1845                 }
1846         }
1847         /*
1848          * The journal_load will have done any necessary log recovery,
1849          * so we can safely mount the rest of the filesystem now.
1850          */
1851
1852         root = iget(sb, EXT3_ROOT_INO);
1853         sb->s_root = d_alloc_root(root);
1854         if (!sb->s_root) {
1855                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1856                 iput(root);
1857                 goto failed_mount4;
1858         }
1859         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1860                 dput(sb->s_root);
1861                 sb->s_root = NULL;
1862                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1863                 goto failed_mount4;
1864         }
1865
1866         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1867         /*
1868          * akpm: core read_super() calls in here with the superblock locked.
1869          * That deadlocks, because orphan cleanup needs to lock the superblock
1870          * in numerous places.  Here we just pop the lock - it's relatively
1871          * harmless, because we are now ready to accept write_super() requests,
1872          * and aviro says that's the only reason for hanging onto the
1873          * superblock lock.
1874          */
1875         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1876         ext3_orphan_cleanup(sb, es);
1877         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1878         if (needs_recovery)
1879                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1880         ext3_mark_recovery_complete(sb, es);
1881         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1882                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1883                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1884                 "writeback");
1885
1886         lock_kernel();
1887         return 0;
1888
1889 cantfind_ext3:
1890         if (!silent)
1891                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1892                        sb->s_id);
1893         goto failed_mount;
1894
1895 failed_mount4:
1896         journal_destroy(sbi->s_journal);
1897 failed_mount3:
1898         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1899         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1900         percpu_counter_destroy(&sbi->s_dirs_counter);
1901 failed_mount2:
1902         for (i = 0; i < db_count; i++)
1903                 brelse(sbi->s_group_desc[i]);
1904         kfree(sbi->s_group_desc);
1905 failed_mount:
1906 #ifdef CONFIG_QUOTA
1907         for (i = 0; i < MAXQUOTAS; i++)
1908                 kfree(sbi->s_qf_names[i]);
1909 #endif
1910         ext3_blkdev_remove(sbi);
1911         brelse(bh);
1912 out_fail:
1913         sb->s_fs_info = NULL;
1914         kfree(sbi);
1915         lock_kernel();
1916         return -EINVAL;
1917 }
1918
1919 /*
1920  * Setup any per-fs journal parameters now.  We'll do this both on
1921  * initial mount, once the journal has been initialised but before we've
1922  * done any recovery; and again on any subsequent remount.
1923  */
1924 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1925 {
1926         struct ext3_sb_info *sbi = EXT3_SB(sb);
1927
1928         if (sbi->s_commit_interval)
1929                 journal->j_commit_interval = sbi->s_commit_interval;
1930         /* We could also set up an ext3-specific default for the commit
1931          * interval here, but for now we'll just fall back to the jbd
1932          * default. */
1933
1934         spin_lock(&journal->j_state_lock);
1935         if (test_opt(sb, BARRIER))
1936                 journal->j_flags |= JFS_BARRIER;
1937         else
1938                 journal->j_flags &= ~JFS_BARRIER;
1939         spin_unlock(&journal->j_state_lock);
1940 }
1941
1942 static journal_t *ext3_get_journal(struct super_block *sb,
1943                                    unsigned int journal_inum)
1944 {
1945         struct inode *journal_inode;
1946         journal_t *journal;
1947
1948         /* First, test for the existence of a valid inode on disk.  Bad
1949          * things happen if we iget() an unused inode, as the subsequent
1950          * iput() will try to delete it. */
1951
1952         journal_inode = iget(sb, journal_inum);
1953         if (!journal_inode) {
1954                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1955                 return NULL;
1956         }
1957         if (!journal_inode->i_nlink) {
1958                 make_bad_inode(journal_inode);
1959                 iput(journal_inode);
1960                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1961                 return NULL;
1962         }
1963
1964         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1965                   journal_inode, journal_inode->i_size);
1966         if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1967                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1968                 iput(journal_inode);
1969                 return NULL;
1970         }
1971
1972         journal = journal_init_inode(journal_inode);
1973         if (!journal) {
1974                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1975                 iput(journal_inode);
1976                 return NULL;
1977         }
1978         journal->j_private = sb;
1979         ext3_init_journal_params(sb, journal);
1980         return journal;
1981 }
1982
1983 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1984                                        dev_t j_dev)
1985 {
1986         struct buffer_head * bh;
1987         journal_t *journal;
1988         ext3_fsblk_t start;
1989         ext3_fsblk_t len;
1990         int hblock, blocksize;
1991         ext3_fsblk_t sb_block;
1992         unsigned long offset;
1993         struct ext3_super_block * es;
1994         struct block_device *bdev;
1995
1996         bdev = ext3_blkdev_get(j_dev);
1997         if (bdev == NULL)
1998                 return NULL;
1999
2000         if (bd_claim(bdev, sb)) {
2001                 printk(KERN_ERR
2002                         "EXT3: failed to claim external journal device.\n");
2003                 blkdev_put(bdev);
2004                 return NULL;
2005         }
2006
2007         blocksize = sb->s_blocksize;
2008         hblock = bdev_hardsect_size(bdev);
2009         if (blocksize < hblock) {
2010                 printk(KERN_ERR
2011                         "EXT3-fs: blocksize too small for journal device.\n");
2012                 goto out_bdev;
2013         }
2014
2015         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2016         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2017         set_blocksize(bdev, blocksize);
2018         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2019                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2020                        "external journal\n");
2021                 goto out_bdev;
2022         }
2023
2024         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2025         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2026             !(le32_to_cpu(es->s_feature_incompat) &
2027               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2028                 printk(KERN_ERR "EXT3-fs: external journal has "
2029                                         "bad superblock\n");
2030                 brelse(bh);
2031                 goto out_bdev;
2032         }
2033
2034         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2035                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2036                 brelse(bh);
2037                 goto out_bdev;
2038         }
2039
2040         len = le32_to_cpu(es->s_blocks_count);
2041         start = sb_block + 1;
2042         brelse(bh);     /* we're done with the superblock */
2043
2044         journal = journal_init_dev(bdev, sb->s_bdev,
2045                                         start, len, blocksize);
2046         if (!journal) {
2047                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2048                 goto out_bdev;
2049         }
2050         journal->j_private = sb;
2051         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2052         wait_on_buffer(journal->j_sb_buffer);
2053         if (!buffer_uptodate(journal->j_sb_buffer)) {
2054                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2055                 goto out_journal;
2056         }
2057         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2058                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2059                                         "user (unsupported) - %d\n",
2060                         be32_to_cpu(journal->j_superblock->s_nr_users));
2061                 goto out_journal;
2062         }
2063         EXT3_SB(sb)->journal_bdev = bdev;
2064         ext3_init_journal_params(sb, journal);
2065         return journal;
2066 out_journal:
2067         journal_destroy(journal);
2068 out_bdev:
2069         ext3_blkdev_put(bdev);
2070         return NULL;
2071 }
2072
2073 static int ext3_load_journal(struct super_block *sb,
2074                              struct ext3_super_block *es,
2075                              unsigned long journal_devnum)
2076 {
2077         journal_t *journal;
2078         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2079         dev_t journal_dev;
2080         int err = 0;
2081         int really_read_only;
2082
2083         if (journal_devnum &&
2084             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2085                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2086                         "numbers have changed\n");
2087                 journal_dev = new_decode_dev(journal_devnum);
2088         } else
2089                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2090
2091         really_read_only = bdev_read_only(sb->s_bdev);
2092
2093         /*
2094          * Are we loading a blank journal or performing recovery after a
2095          * crash?  For recovery, we need to check in advance whether we
2096          * can get read-write access to the device.
2097          */
2098
2099         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2100                 if (sb->s_flags & MS_RDONLY) {
2101                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2102                                         "required on readonly filesystem.\n");
2103                         if (really_read_only) {
2104                                 printk(KERN_ERR "EXT3-fs: write access "
2105                                         "unavailable, cannot proceed.\n");
2106                                 return -EROFS;
2107                         }
2108                         printk (KERN_INFO "EXT3-fs: write access will "
2109                                         "be enabled during recovery.\n");
2110                 }
2111         }
2112
2113         if (journal_inum && journal_dev) {
2114                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2115                        "and inode journals!\n");
2116                 return -EINVAL;
2117         }
2118
2119         if (journal_inum) {
2120                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2121                         return -EINVAL;
2122         } else {
2123                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2124                         return -EINVAL;
2125         }
2126
2127         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2128                 err = journal_update_format(journal);
2129                 if (err)  {
2130                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2131                         journal_destroy(journal);
2132                         return err;
2133                 }
2134         }
2135
2136         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2137                 err = journal_wipe(journal, !really_read_only);
2138         if (!err)
2139                 err = journal_load(journal);
2140
2141         if (err) {
2142                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2143                 journal_destroy(journal);
2144                 return err;
2145         }
2146
2147         EXT3_SB(sb)->s_journal = journal;
2148         ext3_clear_journal_err(sb, es);
2149
2150         if (journal_devnum &&
2151             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2152                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2153                 sb->s_dirt = 1;
2154
2155                 /* Make sure we flush the recovery flag to disk. */
2156                 ext3_commit_super(sb, es, 1);
2157         }
2158
2159         return 0;
2160 }
2161
2162 static int ext3_create_journal(struct super_block * sb,
2163                                struct ext3_super_block * es,
2164                                unsigned int journal_inum)
2165 {
2166         journal_t *journal;
2167         int err;
2168
2169         if (sb->s_flags & MS_RDONLY) {
2170                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2171                                 "create journal.\n");
2172                 return -EROFS;
2173         }
2174
2175         journal = ext3_get_journal(sb, journal_inum);
2176         if (!journal)
2177                 return -EINVAL;
2178
2179         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2180                journal_inum);
2181
2182         err = journal_create(journal);
2183         if (err) {
2184                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2185                 journal_destroy(journal);
2186                 return -EIO;
2187         }
2188
2189         EXT3_SB(sb)->s_journal = journal;
2190
2191         ext3_update_dynamic_rev(sb);
2192         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2193         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2194
2195         es->s_journal_inum = cpu_to_le32(journal_inum);
2196         sb->s_dirt = 1;
2197
2198         /* Make sure we flush the recovery flag to disk. */
2199         ext3_commit_super(sb, es, 1);
2200
2201         return 0;
2202 }
2203
2204 static void ext3_commit_super (struct super_block * sb,
2205                                struct ext3_super_block * es,
2206                                int sync)
2207 {
2208         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2209
2210         if (!sbh)
2211                 return;
2212         es->s_wtime = cpu_to_le32(get_seconds());
2213         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2214         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2215         BUFFER_TRACE(sbh, "marking dirty");
2216         mark_buffer_dirty(sbh);
2217         if (sync)
2218                 sync_dirty_buffer(sbh);
2219 }
2220
2221
2222 /*
2223  * Have we just finished recovery?  If so, and if we are mounting (or
2224  * remounting) the filesystem readonly, then we will end up with a
2225  * consistent fs on disk.  Record that fact.
2226  */
2227 static void ext3_mark_recovery_complete(struct super_block * sb,
2228                                         struct ext3_super_block * es)
2229 {
2230         journal_t *journal = EXT3_SB(sb)->s_journal;
2231
2232         journal_lock_updates(journal);
2233         journal_flush(journal);
2234         lock_super(sb);
2235         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2236             sb->s_flags & MS_RDONLY) {
2237                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2238                 sb->s_dirt = 0;
2239                 ext3_commit_super(sb, es, 1);
2240         }
2241         unlock_super(sb);
2242         journal_unlock_updates(journal);
2243 }
2244
2245 /*
2246  * If we are mounting (or read-write remounting) a filesystem whose journal
2247  * has recorded an error from a previous lifetime, move that error to the
2248  * main filesystem now.
2249  */
2250 static void ext3_clear_journal_err(struct super_block * sb,
2251                                    struct ext3_super_block * es)
2252 {
2253         journal_t *journal;
2254         int j_errno;
2255         const char *errstr;
2256
2257         journal = EXT3_SB(sb)->s_journal;
2258
2259         /*
2260          * Now check for any error status which may have been recorded in the
2261          * journal by a prior ext3_error() or ext3_abort()
2262          */
2263
2264         j_errno = journal_errno(journal);
2265         if (j_errno) {
2266                 char nbuf[16];
2267
2268                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2269                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2270                              "from previous mount: %s", errstr);
2271                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2272                              "filesystem check.");
2273
2274                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2275                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2276                 ext3_commit_super (sb, es, 1);
2277
2278                 journal_clear_err(journal);
2279         }
2280 }
2281
2282 /*
2283  * Force the running and committing transactions to commit,
2284  * and wait on the commit.
2285  */
2286 int ext3_force_commit(struct super_block *sb)
2287 {
2288         journal_t *journal;
2289         int ret;
2290
2291         if (sb->s_flags & MS_RDONLY)
2292                 return 0;
2293
2294         journal = EXT3_SB(sb)->s_journal;
2295         sb->s_dirt = 0;
2296         ret = ext3_journal_force_commit(journal);
2297         return ret;
2298 }
2299
2300 /*
2301  * Ext3 always journals updates to the superblock itself, so we don't
2302  * have to propagate any other updates to the superblock on disk at this
2303  * point.  Just start an async writeback to get the buffers on their way
2304  * to the disk.
2305  *
2306  * This implicitly triggers the writebehind on sync().
2307  */
2308
2309 static void ext3_write_super (struct super_block * sb)
2310 {
2311         if (mutex_trylock(&sb->s_lock) != 0)
2312                 BUG();
2313         sb->s_dirt = 0;
2314 }
2315
2316 static int ext3_sync_fs(struct super_block *sb, int wait)
2317 {
2318         tid_t target;
2319
2320         sb->s_dirt = 0;
2321         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2322                 if (wait)
2323                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2324         }
2325         return 0;
2326 }
2327
2328 /*
2329  * LVM calls this function before a (read-only) snapshot is created.  This
2330  * gives us a chance to flush the journal completely and mark the fs clean.
2331  */
2332 static void ext3_write_super_lockfs(struct super_block *sb)
2333 {
2334         sb->s_dirt = 0;
2335
2336         if (!(sb->s_flags & MS_RDONLY)) {
2337                 journal_t *journal = EXT3_SB(sb)->s_journal;
2338
2339                 /* Now we set up the journal barrier. */
2340                 journal_lock_updates(journal);
2341                 journal_flush(journal);
2342
2343                 /* Journal blocked and flushed, clear needs_recovery flag. */
2344                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2345                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2346         }
2347 }
2348
2349 /*
2350  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2351  * flag here, even though the filesystem is not technically dirty yet.
2352  */
2353 static void ext3_unlockfs(struct super_block *sb)
2354 {
2355         if (!(sb->s_flags & MS_RDONLY)) {
2356                 lock_super(sb);
2357                 /* Reser the needs_recovery flag before the fs is unlocked. */
2358                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2359                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2360                 unlock_super(sb);
2361                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2362         }
2363 }
2364
2365 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2366 {
2367         struct ext3_super_block * es;
2368         struct ext3_sb_info *sbi = EXT3_SB(sb);
2369         ext3_fsblk_t n_blocks_count = 0;
2370         unsigned long old_sb_flags;
2371         struct ext3_mount_options old_opts;
2372         int err;
2373 #ifdef CONFIG_QUOTA
2374         int i;
2375 #endif
2376
2377         /* Store the original options */
2378         old_sb_flags = sb->s_flags;
2379         old_opts.s_mount_opt = sbi->s_mount_opt;
2380         old_opts.s_resuid = sbi->s_resuid;
2381         old_opts.s_resgid = sbi->s_resgid;
2382         old_opts.s_commit_interval = sbi->s_commit_interval;
2383 #ifdef CONFIG_QUOTA
2384         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2385         for (i = 0; i < MAXQUOTAS; i++)
2386                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2387 #endif
2388
2389         /*
2390          * Allow the "check" option to be passed as a remount option.
2391          */
2392         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2393                 err = -EINVAL;
2394                 goto restore_opts;
2395         }
2396
2397         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2398                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2399
2400         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2401                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2402
2403         es = sbi->s_es;
2404
2405         ext3_init_journal_params(sb, sbi->s_journal);
2406
2407         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2408                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2409                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2410                         err = -EROFS;
2411                         goto restore_opts;
2412                 }
2413
2414                 if (*flags & MS_RDONLY) {
2415                         /*
2416                          * First of all, the unconditional stuff we have to do
2417                          * to disable replay of the journal when we next remount
2418                          */
2419                         sb->s_flags |= MS_RDONLY;
2420
2421                         /*
2422                          * OK, test if we are remounting a valid rw partition
2423                          * readonly, and if so set the rdonly flag and then
2424                          * mark the partition as valid again.
2425                          */
2426                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2427                             (sbi->s_mount_state & EXT3_VALID_FS))
2428                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2429
2430                         /*
2431                          * We have to unlock super so that we can wait for
2432                          * transactions.
2433                          */
2434                         unlock_super(sb);
2435                         ext3_mark_recovery_complete(sb, es);
2436                         lock_super(sb);
2437                 } else {
2438                         __le32 ret;
2439                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2440                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2441                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2442                                        "remount RDWR because of unsupported "
2443                                        "optional features (%x).\n",
2444                                        sb->s_id, le32_to_cpu(ret));
2445                                 err = -EROFS;
2446                                 goto restore_opts;
2447                         }
2448
2449                         /*
2450                          * If we have an unprocessed orphan list hanging
2451                          * around from a previously readonly bdev mount,
2452                          * require a full umount/remount for now.
2453                          */
2454                         if (es->s_last_orphan) {
2455                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2456                                        "remount RDWR because of unprocessed "
2457                                        "orphan inode list.  Please "
2458                                        "umount/remount instead.\n",
2459                                        sb->s_id);
2460                                 err = -EINVAL;
2461                                 goto restore_opts;
2462                         }
2463
2464                         /*
2465                          * Mounting a RDONLY partition read-write, so reread
2466                          * and store the current valid flag.  (It may have
2467                          * been changed by e2fsck since we originally mounted
2468                          * the partition.)
2469                          */
2470                         ext3_clear_journal_err(sb, es);
2471                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2472                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2473                                 goto restore_opts;
2474                         if (!ext3_setup_super (sb, es, 0))
2475                                 sb->s_flags &= ~MS_RDONLY;
2476                 }
2477         }
2478 #ifdef CONFIG_QUOTA
2479         /* Release old quota file names */
2480         for (i = 0; i < MAXQUOTAS; i++)
2481                 if (old_opts.s_qf_names[i] &&
2482                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2483                         kfree(old_opts.s_qf_names[i]);
2484 #endif
2485         return 0;
2486 restore_opts:
2487         sb->s_flags = old_sb_flags;
2488         sbi->s_mount_opt = old_opts.s_mount_opt;
2489         sbi->s_resuid = old_opts.s_resuid;
2490         sbi->s_resgid = old_opts.s_resgid;
2491         sbi->s_commit_interval = old_opts.s_commit_interval;
2492 #ifdef CONFIG_QUOTA
2493         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2494         for (i = 0; i < MAXQUOTAS; i++) {
2495                 if (sbi->s_qf_names[i] &&
2496                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2497                         kfree(sbi->s_qf_names[i]);
2498                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2499         }
2500 #endif
2501         return err;
2502 }
2503
2504 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2505 {
2506         struct super_block *sb = dentry->d_sb;
2507         struct ext3_sb_info *sbi = EXT3_SB(sb);
2508         struct ext3_super_block *es = sbi->s_es;
2509         u64 fsid;
2510
2511         if (test_opt(sb, MINIX_DF)) {
2512                 sbi->s_overhead_last = 0;
2513         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2514                 unsigned long ngroups = sbi->s_groups_count, i;
2515                 ext3_fsblk_t overhead = 0;
2516                 smp_rmb();
2517
2518                 /*
2519                  * Compute the overhead (FS structures).  This is constant
2520                  * for a given filesystem unless the number of block groups
2521                  * changes so we cache the previous value until it does.
2522                  */
2523
2524                 /*
2525                  * All of the blocks before first_data_block are
2526                  * overhead
2527                  */
2528                 overhead = le32_to_cpu(es->s_first_data_block);
2529
2530                 /*
2531                  * Add the overhead attributed to the superblock and
2532                  * block group descriptors.  If the sparse superblocks
2533                  * feature is turned on, then not all groups have this.
2534                  */
2535                 for (i = 0; i < ngroups; i++) {
2536                         overhead += ext3_bg_has_super(sb, i) +
2537                                 ext3_bg_num_gdb(sb, i);
2538                         cond_resched();
2539                 }
2540
2541                 /*
2542                  * Every block group has an inode bitmap, a block
2543                  * bitmap, and an inode table.
2544                  */
2545                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2546                 sbi->s_overhead_last = overhead;
2547                 smp_wmb();
2548                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2549         }
2550
2551         buf->f_type = EXT3_SUPER_MAGIC;
2552         buf->f_bsize = sb->s_blocksize;
2553         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2554         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2555         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2556         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2557         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2558                 buf->f_bavail = 0;
2559         buf->f_files = le32_to_cpu(es->s_inodes_count);
2560         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2561         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2562         buf->f_namelen = EXT3_NAME_LEN;
2563         fsid = le64_to_cpup((void *)es->s_uuid) ^
2564                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2565         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2566         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2567         return 0;
2568 }
2569
2570 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2571  * is locked for write. Otherwise the are possible deadlocks:
2572  * Process 1                         Process 2
2573  * ext3_create()                     quota_sync()
2574  *   journal_start()                   write_dquot()
2575  *   DQUOT_INIT()                        down(dqio_mutex)
2576  *     down(dqio_mutex)                    journal_start()
2577  *
2578  */
2579
2580 #ifdef CONFIG_QUOTA
2581
2582 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2583 {
2584         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2585 }
2586
2587 static int ext3_dquot_initialize(struct inode *inode, int type)
2588 {
2589         handle_t *handle;
2590         int ret, err;
2591
2592         /* We may create quota structure so we need to reserve enough blocks */
2593         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2594         if (IS_ERR(handle))
2595                 return PTR_ERR(handle);
2596         ret = dquot_initialize(inode, type);
2597         err = ext3_journal_stop(handle);
2598         if (!ret)
2599                 ret = err;
2600         return ret;
2601 }
2602
2603 static int ext3_dquot_drop(struct inode *inode)
2604 {
2605         handle_t *handle;
2606         int ret, err;
2607
2608         /* We may delete quota structure so we need to reserve enough blocks */
2609         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2610         if (IS_ERR(handle))
2611                 return PTR_ERR(handle);
2612         ret = dquot_drop(inode);
2613         err = ext3_journal_stop(handle);
2614         if (!ret)
2615                 ret = err;
2616         return ret;
2617 }
2618
2619 static int ext3_write_dquot(struct dquot *dquot)
2620 {
2621         int ret, err;
2622         handle_t *handle;
2623         struct inode *inode;
2624
2625         inode = dquot_to_inode(dquot);
2626         handle = ext3_journal_start(inode,
2627                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2628         if (IS_ERR(handle))
2629                 return PTR_ERR(handle);
2630         ret = dquot_commit(dquot);
2631         err = ext3_journal_stop(handle);
2632         if (!ret)
2633                 ret = err;
2634         return ret;
2635 }
2636
2637 static int ext3_acquire_dquot(struct dquot *dquot)
2638 {
2639         int ret, err;
2640         handle_t *handle;
2641
2642         handle = ext3_journal_start(dquot_to_inode(dquot),
2643                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2644         if (IS_ERR(handle))
2645                 return PTR_ERR(handle);
2646         ret = dquot_acquire(dquot);
2647         err = ext3_journal_stop(handle);
2648         if (!ret)
2649                 ret = err;
2650         return ret;
2651 }
2652
2653 static int ext3_release_dquot(struct dquot *dquot)
2654 {
2655         int ret, err;
2656         handle_t *handle;
2657
2658         handle = ext3_journal_start(dquot_to_inode(dquot),
2659                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2660         if (IS_ERR(handle)) {
2661                 /* Release dquot anyway to avoid endless cycle in dqput() */
2662                 dquot_release(dquot);
2663                 return PTR_ERR(handle);
2664         }
2665         ret = dquot_release(dquot);
2666         err = ext3_journal_stop(handle);
2667         if (!ret)
2668                 ret = err;
2669         return ret;
2670 }
2671
2672 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2673 {
2674         /* Are we journalling quotas? */
2675         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2676             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2677                 dquot_mark_dquot_dirty(dquot);
2678                 return ext3_write_dquot(dquot);
2679         } else {
2680                 return dquot_mark_dquot_dirty(dquot);
2681         }
2682 }
2683
2684 static int ext3_write_info(struct super_block *sb, int type)
2685 {
2686         int ret, err;
2687         handle_t *handle;
2688
2689         /* Data block + inode block */
2690         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2691         if (IS_ERR(handle))
2692                 return PTR_ERR(handle);
2693         ret = dquot_commit_info(sb, type);
2694         err = ext3_journal_stop(handle);
2695         if (!ret)
2696                 ret = err;
2697         return ret;
2698 }
2699
2700 /*
2701  * Turn on quotas during mount time - we need to find
2702  * the quota file and such...
2703  */
2704 static int ext3_quota_on_mount(struct super_block *sb, int type)
2705 {
2706         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2707                         EXT3_SB(sb)->s_jquota_fmt, type);
2708 }
2709
2710 /*
2711  * Standard function to be called on quota_on
2712  */
2713 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2714                          char *path)
2715 {
2716         int err;
2717         struct nameidata nd;
2718
2719         if (!test_opt(sb, QUOTA))
2720                 return -EINVAL;
2721         /* Not journalling quota? */
2722         if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2723             !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2724                 return vfs_quota_on(sb, type, format_id, path);
2725         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2726         if (err)
2727                 return err;
2728         /* Quotafile not on the same filesystem? */
2729         if (nd.mnt->mnt_sb != sb) {
2730                 path_release(&nd);
2731                 return -EXDEV;
2732         }
2733         /* Quotafile not of fs root? */
2734         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2735                 printk(KERN_WARNING
2736                         "EXT3-fs: Quota file not on filesystem root. "
2737                         "Journalled quota will not work.\n");
2738         path_release(&nd);
2739         return vfs_quota_on(sb, type, format_id, path);
2740 }
2741
2742 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2743  * acquiring the locks... As quota files are never truncated and quota code
2744  * itself serializes the operations (and noone else should touch the files)
2745  * we don't have to be afraid of races */
2746 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2747                                size_t len, loff_t off)
2748 {
2749         struct inode *inode = sb_dqopt(sb)->files[type];
2750         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2751         int err = 0;
2752         int offset = off & (sb->s_blocksize - 1);
2753         int tocopy;
2754         size_t toread;
2755         struct buffer_head *bh;
2756         loff_t i_size = i_size_read(inode);
2757
2758         if (off > i_size)
2759                 return 0;
2760         if (off+len > i_size)
2761                 len = i_size-off;
2762         toread = len;
2763         while (toread > 0) {
2764                 tocopy = sb->s_blocksize - offset < toread ?
2765                                 sb->s_blocksize - offset : toread;
2766                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2767                 if (err)
2768                         return err;
2769                 if (!bh)        /* A hole? */
2770                         memset(data, 0, tocopy);
2771                 else
2772                         memcpy(data, bh->b_data+offset, tocopy);
2773                 brelse(bh);
2774                 offset = 0;
2775                 toread -= tocopy;
2776                 data += tocopy;
2777                 blk++;
2778         }
2779         return len;
2780 }
2781
2782 /* Write to quotafile (we know the transaction is already started and has
2783  * enough credits) */
2784 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2785                                 const char *data, size_t len, loff_t off)
2786 {
2787         struct inode *inode = sb_dqopt(sb)->files[type];
2788         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2789         int err = 0;
2790         int offset = off & (sb->s_blocksize - 1);
2791         int tocopy;
2792         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2793         size_t towrite = len;
2794         struct buffer_head *bh;
2795         handle_t *handle = journal_current_handle();
2796
2797         if (!handle) {
2798                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2799                         " cancelled because transaction is not started.\n",
2800                         (unsigned long long)off, (unsigned long long)len);
2801                 return -EIO;
2802         }
2803         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2804         while (towrite > 0) {
2805                 tocopy = sb->s_blocksize - offset < towrite ?
2806                                 sb->s_blocksize - offset : towrite;
2807                 bh = ext3_bread(handle, inode, blk, 1, &err);
2808                 if (!bh)
2809                         goto out;
2810                 if (journal_quota) {
2811                         err = ext3_journal_get_write_access(handle, bh);
2812                         if (err) {
2813                                 brelse(bh);
2814                                 goto out;
2815                         }
2816                 }
2817                 lock_buffer(bh);
2818                 memcpy(bh->b_data+offset, data, tocopy);
2819                 flush_dcache_page(bh->b_page);
2820                 unlock_buffer(bh);
2821                 if (journal_quota)
2822                         err = ext3_journal_dirty_metadata(handle, bh);
2823                 else {
2824                         /* Always do at least ordered writes for quotas */
2825                         err = ext3_journal_dirty_data(handle, bh);
2826                         mark_buffer_dirty(bh);
2827                 }
2828                 brelse(bh);
2829                 if (err)
2830                         goto out;
2831                 offset = 0;
2832                 towrite -= tocopy;
2833                 data += tocopy;
2834                 blk++;
2835         }
2836 out:
2837         if (len == towrite)
2838                 return err;
2839         if (inode->i_size < off+len-towrite) {
2840                 i_size_write(inode, off+len-towrite);
2841                 EXT3_I(inode)->i_disksize = inode->i_size;
2842         }
2843         inode->i_version++;
2844         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2845         ext3_mark_inode_dirty(handle, inode);
2846         mutex_unlock(&inode->i_mutex);
2847         return len - towrite;
2848 }
2849
2850 #endif
2851
2852 static int ext3_get_sb(struct file_system_type *fs_type,
2853         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2854 {
2855         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2856 }
2857
2858 static struct file_system_type ext3_fs_type = {
2859         .owner          = THIS_MODULE,
2860         .name           = "ext3",
2861         .get_sb         = ext3_get_sb,
2862         .kill_sb        = kill_block_super,
2863         .fs_flags       = FS_REQUIRES_DEV,
2864 };
2865
2866 static int __init init_ext3_fs(void)
2867 {
2868         int err = init_ext3_xattr();
2869         if (err)
2870                 return err;
2871         err = init_inodecache();
2872         if (err)
2873                 goto out1;
2874         err = register_filesystem(&ext3_fs_type);
2875         if (err)
2876                 goto out;
2877         return 0;
2878 out:
2879         destroy_inodecache();
2880 out1:
2881         exit_ext3_xattr();
2882         return err;
2883 }
2884
2885 static void __exit exit_ext3_fs(void)
2886 {
2887         unregister_filesystem(&ext3_fs_type);
2888         destroy_inodecache();
2889         exit_ext3_xattr();
2890 }
2891
2892 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2893 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2894 MODULE_LICENSE("GPL");
2895 module_init(init_ext3_fs)
2896 module_exit(exit_ext3_fs)