[PATCH] ext4: initial copy of files from ext3

Start of the ext4 patch series.  See Documentation/filesystems/ext4.txt for
details.

This is a simple copy of the files in fs/ext3 to fs/ext4 and
/usr/incude/linux/ext3* to /usr/include/ex4*

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2754 insertions, 0 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
new file mode 100644
index 000000000000..8bfd56ef18ca
--- /dev/null
+++ b/fs/ext4/super.c
@@ -0,0 +1,2754 @@
+/*
+ *  linux/fs/ext3/super.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/fs/minix/inode.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  Big-endian to little-endian byte-swapping/bitmaps by
+ *        David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/time.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/ext3_jbd.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/parser.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/random.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/quotaops.h>
+#include <linux/seq_file.h>
+
+#include <asm/uaccess.h>
+
+#include "xattr.h"
+#include "acl.h"
+#include "namei.h"
+
+static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
+			     unsigned long journal_devnum);
+static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
+			       unsigned int);
+static void ext3_commit_super (struct super_block * sb,
+			       struct ext3_super_block * es,
+			       int sync);
+static void ext3_mark_recovery_complete(struct super_block * sb,
+					struct ext3_super_block * es);
+static void ext3_clear_journal_err(struct super_block * sb,
+				   struct ext3_super_block * es);
+static int ext3_sync_fs(struct super_block *sb, int wait);
+static const char *ext3_decode_error(struct super_block * sb, int errno,
+				     char nbuf[16]);
+static int ext3_remount (struct super_block * sb, int * flags, char * data);
+static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
+static void ext3_unlockfs(struct super_block *sb);
+static void ext3_write_super (struct super_block * sb);
+static void ext3_write_super_lockfs(struct super_block *sb);
+
+/*
+ * Wrappers for journal_start/end.
+ *
+ * The only special thing we need to do here is to make sure that all
+ * journal_end calls result in the superblock being marked dirty, so
+ * that sync() will call the filesystem's write_super callback if
+ * appropriate.
+ */
+handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
+{
+	journal_t *journal;
+
+	if (sb->s_flags & MS_RDONLY)
+		return ERR_PTR(-EROFS);
+
+	/* Special case here: if the journal has aborted behind our
+	 * backs (eg. EIO in the commit thread), then we still need to
+	 * take the FS itself readonly cleanly. */
+	journal = EXT3_SB(sb)->s_journal;
+	if (is_journal_aborted(journal)) {
+		ext3_abort(sb, __FUNCTION__,
+			   "Detected aborted journal");
+		return ERR_PTR(-EROFS);
+	}
+
+	return journal_start(journal, nblocks);
+}
+
+/*
+ * The only special thing we need to do here is to make sure that all
+ * journal_stop calls result in the superblock being marked dirty, so
+ * that sync() will call the filesystem's write_super callback if
+ * appropriate.
+ */
+int __ext3_journal_stop(const char *where, handle_t *handle)
+{
+	struct super_block *sb;
+	int err;
+	int rc;
+
+	sb = handle->h_transaction->t_journal->j_private;
+	err = handle->h_err;
+	rc = journal_stop(handle);
+
+	if (!err)
+		err = rc;
+	if (err)
+		__ext3_std_error(sb, where, err);
+	return err;
+}
+
+void ext3_journal_abort_handle(const char *caller, const char *err_fn,
+		struct buffer_head *bh, handle_t *handle, int err)
+{
+	char nbuf[16];
+	const char *errstr = ext3_decode_error(NULL, err, nbuf);
+
+	if (bh)
+		BUFFER_TRACE(bh, "abort");
+
+	if (!handle->h_err)
+		handle->h_err = err;
+
+	if (is_handle_aborted(handle))
+		return;
+
+	printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
+	       caller, errstr, err_fn);
+
+	journal_abort_handle(handle);
+}
+
+/* Deal with the reporting of failure conditions on a filesystem such as
+ * inconsistencies detected or read IO failures.
+ *
+ * On ext2, we can store the error state of the filesystem in the
+ * superblock.  That is not possible on ext3, because we may have other
+ * write ordering constraints on the superblock which prevent us from
+ * writing it out straight away; and given that the journal is about to
+ * be aborted, we can't rely on the current, or future, transactions to
+ * write out the superblock safely.
+ *
+ * We'll just use the journal_abort() error code to record an error in
+ * the journal instead.  On recovery, the journal will compain about
+ * that error until we've noted it down and cleared it.
+ */
+
+static void ext3_handle_error(struct super_block *sb)
+{
+	struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+
+	EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
+	es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
+
+	if (sb->s_flags & MS_RDONLY)
+		return;
+
+	if (!test_opt (sb, ERRORS_CONT)) {
+		journal_t *journal = EXT3_SB(sb)->s_journal;
+
+		EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
+		if (journal)
+			journal_abort(journal, -EIO);
+	}
+	if (test_opt (sb, ERRORS_RO)) {
+		printk (KERN_CRIT "Remounting filesystem read-only\n");
+		sb->s_flags |= MS_RDONLY;
+	}
+	ext3_commit_super(sb, es, 1);
+	if (test_opt(sb, ERRORS_PANIC))
+		panic("EXT3-fs (device %s): panic forced after error\n",
+			sb->s_id);
+}
+
+void ext3_error (struct super_block * sb, const char * function,
+		 const char * fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
+	vprintk(fmt, args);
+	printk("\n");
+	va_end(args);
+
+	ext3_handle_error(sb);
+}
+
+static const char *ext3_decode_error(struct super_block * sb, int errno,
+				     char nbuf[16])
+{
+	char *errstr = NULL;
+
+	switch (errno) {
+	case -EIO:
+		errstr = "IO failure";
+		break;
+	case -ENOMEM:
+		errstr = "Out of memory";
+		break;
+	case -EROFS:
+		if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
+			errstr = "Journal has aborted";
+		else
+			errstr = "Readonly filesystem";
+		break;
+	default:
+		/* If the caller passed in an extra buffer for unknown
+		 * errors, textualise them now.  Else we just return
+		 * NULL. */
+		if (nbuf) {
+			/* Check for truncated error codes... */
+			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
+				errstr = nbuf;
+		}
+		break;
+	}
+
+	return errstr;
+}
+
+/* __ext3_std_error decodes expected errors from journaling functions
+ * automatically and invokes the appropriate error response.  */
+
+void __ext3_std_error (struct super_block * sb, const char * function,
+		       int errno)
+{
+	char nbuf[16];
+	const char *errstr;
+
+	/* Special case: if the error is EROFS, and we're not already
+	 * inside a transaction, then there's really no point in logging
+	 * an error. */
+	if (errno == -EROFS && journal_current_handle() == NULL &&
+	    (sb->s_flags & MS_RDONLY))
+		return;
+
+	errstr = ext3_decode_error(sb, errno, nbuf);
+	printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
+		sb->s_id, function, errstr);
+
+	ext3_handle_error(sb);
+}
+
+/*
+ * ext3_abort is a much stronger failure handler than ext3_error.  The
+ * abort function may be used to deal with unrecoverable failures such
+ * as journal IO errors or ENOMEM at a critical moment in log management.
+ *
+ * We unconditionally force the filesystem into an ABORT|READONLY state,
+ * unless the error response on the fs has been set to panic in which
+ * case we take the easy way out and panic immediately.
+ */
+
+void ext3_abort (struct super_block * sb, const char * function,
+		 const char * fmt, ...)
+{
+	va_list args;
+
+	printk (KERN_CRIT "ext3_abort called.\n");
+
+	va_start(args, fmt);
+	printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
+	vprintk(fmt, args);
+	printk("\n");
+	va_end(args);
+
+	if (test_opt(sb, ERRORS_PANIC))
+		panic("EXT3-fs panic from previous error\n");
+
+	if (sb->s_flags & MS_RDONLY)
+		return;
+
+	printk(KERN_CRIT "Remounting filesystem read-only\n");
+	EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
+	sb->s_flags |= MS_RDONLY;
+	EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
+	journal_abort(EXT3_SB(sb)->s_journal, -EIO);
+}
+
+void ext3_warning (struct super_block * sb, const char * function,
+		   const char * fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
+	       sb->s_id, function);
+	vprintk(fmt, args);
+	printk("\n");
+	va_end(args);
+}
+
+void ext3_update_dynamic_rev(struct super_block *sb)
+{
+	struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+
+	if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
+		return;
+
+	ext3_warning(sb, __FUNCTION__,
+		     "updating to rev %d because of new feature flag, "
+		     "running e2fsck is recommended",
+		     EXT3_DYNAMIC_REV);
+
+	es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
+	es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
+	es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
+	/* leave es->s_feature_*compat flags alone */
+	/* es->s_uuid will be set by e2fsck if empty */
+
+	/*
+	 * The rest of the superblock fields should be zero, and if not it
+	 * means they are likely already in use, so leave them alone.  We
+	 * can leave it up to e2fsck to clean up any inconsistencies there.
+	 */
+}
+
+/*
+ * Open the external journal device
+ */
+static struct block_device *ext3_blkdev_get(dev_t dev)
+{
+	struct block_device *bdev;
+	char b[BDEVNAME_SIZE];
+
+	bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
+	if (IS_ERR(bdev))
+		goto fail;
+	return bdev;
+
+fail:
+	printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
+			__bdevname(dev, b), PTR_ERR(bdev));
+	return NULL;
+}
+
+/*
+ * Release the journal device
+ */
+static int ext3_blkdev_put(struct block_device *bdev)
+{
+	bd_release(bdev);
+	return blkdev_put(bdev);
+}
+
+static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
+{
+	struct block_device *bdev;
+	int ret = -ENODEV;
+
+	bdev = sbi->journal_bdev;
+	if (bdev) {
+		ret = ext3_blkdev_put(bdev);
+		sbi->journal_bdev = NULL;
+	}
+	return ret;
+}
+
+static inline struct inode *orphan_list_entry(struct list_head *l)
+{
+	return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
+}
+
+static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
+{
+	struct list_head *l;
+
+	printk(KERN_ERR "sb orphan head is %d\n",
+	       le32_to_cpu(sbi->s_es->s_last_orphan));
+
+	printk(KERN_ERR "sb_info orphan list:\n");
+	list_for_each(l, &sbi->s_orphan) {
+		struct inode *inode = orphan_list_entry(l);
+		printk(KERN_ERR "  "
+		       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
+		       inode->i_sb->s_id, inode->i_ino, inode,
+		       inode->i_mode, inode->i_nlink,
+		       NEXT_ORPHAN(inode));
+	}
+}
+
+static void ext3_put_super (struct super_block * sb)
+{
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	struct ext3_super_block *es = sbi->s_es;
+	int i;
+
+	ext3_xattr_put_super(sb);
+	journal_destroy(sbi->s_journal);
+	if (!(sb->s_flags & MS_RDONLY)) {
+		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+		es->s_state = cpu_to_le16(sbi->s_mount_state);
+		BUFFER_TRACE(sbi->s_sbh, "marking dirty");
+		mark_buffer_dirty(sbi->s_sbh);
+		ext3_commit_super(sb, es, 1);
+	}
+
+	for (i = 0; i < sbi->s_gdb_count; i++)
+		brelse(sbi->s_group_desc[i]);
+	kfree(sbi->s_group_desc);
+	percpu_counter_destroy(&sbi->s_freeblocks_counter);
+	percpu_counter_destroy(&sbi->s_freeinodes_counter);
+	percpu_counter_destroy(&sbi->s_dirs_counter);
+	brelse(sbi->s_sbh);
+#ifdef CONFIG_QUOTA
+	for (i = 0; i < MAXQUOTAS; i++)
+		kfree(sbi->s_qf_names[i]);
+#endif
+
+	/* Debugging code just in case the in-memory inode orphan list
+	 * isn't empty.  The on-disk one can be non-empty if we've
+	 * detected an error and taken the fs readonly, but the
+	 * in-memory list had better be clean by this point. */
+	if (!list_empty(&sbi->s_orphan))
+		dump_orphan_list(sb, sbi);
+	J_ASSERT(list_empty(&sbi->s_orphan));
+
+	invalidate_bdev(sb->s_bdev, 0);
+	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
+		/*
+		 * Invalidate the journal device's buffers.  We don't want them
+		 * floating about in memory - the physical journal device may
+		 * hotswapped, and it breaks the `ro-after' testing code.
+		 */
+		sync_blockdev(sbi->journal_bdev);
+		invalidate_bdev(sbi->journal_bdev, 0);
+		ext3_blkdev_remove(sbi);
+	}
+	sb->s_fs_info = NULL;
+	kfree(sbi);
+	return;
+}
+
+static kmem_cache_t *ext3_inode_cachep;
+
+/*
+ * Called inside transaction, so use GFP_NOFS
+ */
+static struct inode *ext3_alloc_inode(struct super_block *sb)
+{
+	struct ext3_inode_info *ei;
+
+	ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
+	if (!ei)
+		return NULL;
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+	ei->i_acl = EXT3_ACL_NOT_CACHED;
+	ei->i_default_acl = EXT3_ACL_NOT_CACHED;
+#endif
+	ei->i_block_alloc_info = NULL;
+	ei->vfs_inode.i_version = 1;
+	return &ei->vfs_inode;
+}
+
+static void ext3_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR) {
+		INIT_LIST_HEAD(&ei->i_orphan);
+#ifdef CONFIG_EXT3_FS_XATTR
+		init_rwsem(&ei->xattr_sem);
+#endif
+		mutex_init(&ei->truncate_mutex);
+		inode_init_once(&ei->vfs_inode);
+	}
+}
+
+static int init_inodecache(void)
+{
+	ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
+					     sizeof(struct ext3_inode_info),
+					     0, (SLAB_RECLAIM_ACCOUNT|
+						SLAB_MEM_SPREAD),
+					     init_once, NULL);
+	if (ext3_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	kmem_cache_destroy(ext3_inode_cachep);
+}
+
+static void ext3_clear_inode(struct inode *inode)
+{
+	struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+	if (EXT3_I(inode)->i_acl &&
+			EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
+		posix_acl_release(EXT3_I(inode)->i_acl);
+		EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
+	}
+	if (EXT3_I(inode)->i_default_acl &&
+			EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
+		posix_acl_release(EXT3_I(inode)->i_default_acl);
+		EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
+	}
+#endif
+	ext3_discard_reservation(inode);
+	EXT3_I(inode)->i_block_alloc_info = NULL;
+	if (unlikely(rsv))
+		kfree(rsv);
+}
+
+static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
+{
+#if defined(CONFIG_QUOTA)
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+
+	if (sbi->s_jquota_fmt)
+		seq_printf(seq, ",jqfmt=%s",
+		(sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
+
+	if (sbi->s_qf_names[USRQUOTA])
+		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
+
+	if (sbi->s_qf_names[GRPQUOTA])
+		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
+
+	if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
+		seq_puts(seq, ",usrquota");
+
+	if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
+		seq_puts(seq, ",grpquota");
+#endif
+}
+
+static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
+{
+	struct super_block *sb = vfs->mnt_sb;
+
+	if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
+		seq_puts(seq, ",data=journal");
+	else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
+		seq_puts(seq, ",data=ordered");
+	else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
+		seq_puts(seq, ",data=writeback");
+
+	ext3_show_quota_options(seq, sb);
+
+	return 0;
+}
+
+
+static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
+{
+	__u32 *objp = vobjp;
+	unsigned long ino = objp[0];
+	__u32 generation = objp[1];
+	struct inode *inode;
+	struct dentry *result;
+
+	if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
+		return ERR_PTR(-ESTALE);
+	if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
+		return ERR_PTR(-ESTALE);
+
+	/* iget isn't really right if the inode is currently unallocated!!
+	 *
+	 * ext3_read_inode will return a bad_inode if the inode had been
+	 * deleted, so we should be safe.
+	 *
+	 * Currently we don't know the generation for parent directory, so
+	 * a generation of 0 means "accept any"
+	 */
+	inode = iget(sb, ino);
+	if (inode == NULL)
+		return ERR_PTR(-ENOMEM);
+	if (is_bad_inode(inode) ||
+	    (generation && inode->i_generation != generation)) {
+		iput(inode);
+		return ERR_PTR(-ESTALE);
+	}
+	/* now to find a dentry.
+	 * If possible, get a well-connected one
+	 */
+	result = d_alloc_anon(inode);
+	if (!result) {
+		iput(inode);
+		return ERR_PTR(-ENOMEM);
+	}
+	return result;
+}
+
+#ifdef CONFIG_QUOTA
+#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
+#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
+
+static int ext3_dquot_initialize(struct inode *inode, int type);
+static int ext3_dquot_drop(struct inode *inode);
+static int ext3_write_dquot(struct dquot *dquot);
+static int ext3_acquire_dquot(struct dquot *dquot);
+static int ext3_release_dquot(struct dquot *dquot);
+static int ext3_mark_dquot_dirty(struct dquot *dquot);
+static int ext3_write_info(struct super_block *sb, int type);
+static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
+static int ext3_quota_on_mount(struct super_block *sb, int type);
+static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
+			       size_t len, loff_t off);
+static ssize_t ext3_quota_write(struct super_block *sb, int type,
+				const char *data, size_t len, loff_t off);
+
+static struct dquot_operations ext3_quota_operations = {
+	.initialize	= ext3_dquot_initialize,
+	.drop		= ext3_dquot_drop,
+	.alloc_space	= dquot_alloc_space,
+	.alloc_inode	= dquot_alloc_inode,
+	.free_space	= dquot_free_space,
+	.free_inode	= dquot_free_inode,
+	.transfer	= dquot_transfer,
+	.write_dquot	= ext3_write_dquot,
+	.acquire_dquot	= ext3_acquire_dquot,
+	.release_dquot	= ext3_release_dquot,
+	.mark_dirty	= ext3_mark_dquot_dirty,
+	.write_info	= ext3_write_info
+};
+
+static struct quotactl_ops ext3_qctl_operations = {
+	.quota_on	= ext3_quota_on,
+	.quota_off	= vfs_quota_off,
+	.quota_sync	= vfs_quota_sync,
+	.get_info	= vfs_get_dqinfo,
+	.set_info	= vfs_set_dqinfo,
+	.get_dqblk	= vfs_get_dqblk,
+	.set_dqblk	= vfs_set_dqblk
+};
+#endif
+
+static struct super_operations ext3_sops = {
+	.alloc_inode	= ext3_alloc_inode,
+	.destroy_inode	= ext3_destroy_inode,
+	.read_inode	= ext3_read_inode,
+	.write_inode	= ext3_write_inode,
+	.dirty_inode	= ext3_dirty_inode,
+	.delete_inode	= ext3_delete_inode,
+	.put_super	= ext3_put_super,
+	.write_super	= ext3_write_super,
+	.sync_fs	= ext3_sync_fs,
+	.write_super_lockfs = ext3_write_super_lockfs,
+	.unlockfs	= ext3_unlockfs,
+	.statfs		= ext3_statfs,
+	.remount_fs	= ext3_remount,
+	.clear_inode	= ext3_clear_inode,
+	.show_options	= ext3_show_options,
+#ifdef CONFIG_QUOTA
+	.quota_read	= ext3_quota_read,
+	.quota_write	= ext3_quota_write,
+#endif
+};
+
+static struct export_operations ext3_export_ops = {
+	.get_parent = ext3_get_parent,
+	.get_dentry = ext3_get_dentry,
+};
+
+enum {
+	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
+	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
+	Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
+	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
+	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
+	Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
+	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
+	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
+	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
+	Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
+	Opt_grpquota
+};
+
+static match_table_t tokens = {
+	{Opt_bsd_df, "bsddf"},
+	{Opt_minix_df, "minixdf"},
+	{Opt_grpid, "grpid"},
+	{Opt_grpid, "bsdgroups"},
+	{Opt_nogrpid, "nogrpid"},
+	{Opt_nogrpid, "sysvgroups"},
+	{Opt_resgid, "resgid=%u"},
+	{Opt_resuid, "resuid=%u"},
+	{Opt_sb, "sb=%u"},
+	{Opt_err_cont, "errors=continue"},
+	{Opt_err_panic, "errors=panic"},
+	{Opt_err_ro, "errors=remount-ro"},
+	{Opt_nouid32, "nouid32"},
+	{Opt_nocheck, "nocheck"},
+	{Opt_nocheck, "check=none"},
+	{Opt_debug, "debug"},
+	{Opt_oldalloc, "oldalloc"},
+	{Opt_orlov, "orlov"},
+	{Opt_user_xattr, "user_xattr"},
+	{Opt_nouser_xattr, "nouser_xattr"},
+	{Opt_acl, "acl"},
+	{Opt_noacl, "noacl"},
+	{Opt_reservation, "reservation"},
+	{Opt_noreservation, "noreservation"},
+	{Opt_noload, "noload"},
+	{Opt_nobh, "nobh"},
+	{Opt_bh, "bh"},
+	{Opt_commit, "commit=%u"},
+	{Opt_journal_update, "journal=update"},
+	{Opt_journal_inum, "journal=%u"},
+	{Opt_journal_dev, "journal_dev=%u"},
+	{Opt_abort, "abort"},
+	{Opt_data_journal, "data=journal"},
+	{Opt_data_ordered, "data=ordered"},
+	{Opt_data_writeback, "data=writeback"},
+	{Opt_offusrjquota, "usrjquota="},
+	{Opt_usrjquota, "usrjquota=%s"},
+	{Opt_offgrpjquota, "grpjquota="},
+	{Opt_grpjquota, "grpjquota=%s"},
+	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
+	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
+	{Opt_grpquota, "grpquota"},
+	{Opt_noquota, "noquota"},
+	{Opt_quota, "quota"},
+	{Opt_usrquota, "usrquota"},
+	{Opt_barrier, "barrier=%u"},
+	{Opt_err, NULL},
+	{Opt_resize, "resize"},
+};
+
+static ext3_fsblk_t get_sb_block(void **data)
+{
+	ext3_fsblk_t	sb_block;
+	char		*options = (char *) *data;
+
+	if (!options || strncmp(options, "sb=", 3) != 0)
+		return 1;	/* Default location */
+	options += 3;
+	/*todo: use simple_strtoll with >32bit ext3 */
+	sb_block = simple_strtoul(options, &options, 0);
+	if (*options && *options != ',') {
+		printk("EXT3-fs: Invalid sb specification: %s\n",
+		       (char *) *data);
+		return 1;
+	}
+	if (*options == ',')
+		options++;
+	*data = (void *) options;
+	return sb_block;
+}
+
+static int parse_options (char *options, struct super_block *sb,
+			  unsigned int *inum, unsigned long *journal_devnum,
+			  ext3_fsblk_t *n_blocks_count, int is_remount)
+{
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	char * p;
+	substring_t args[MAX_OPT_ARGS];
+	int data_opt = 0;
+	int option;
+#ifdef CONFIG_QUOTA
+	int qtype;
+	char *qname;
+#endif
+
+	if (!options)
+		return 1;
+
+	while ((p = strsep (&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_bsd_df:
+			clear_opt (sbi->s_mount_opt, MINIX_DF);
+			break;
+		case Opt_minix_df:
+			set_opt (sbi->s_mount_opt, MINIX_DF);
+			break;
+		case Opt_grpid:
+			set_opt (sbi->s_mount_opt, GRPID);
+			break;
+		case Opt_nogrpid:
+			clear_opt (sbi->s_mount_opt, GRPID);
+			break;
+		case Opt_resuid:
+			if (match_int(&args[0], &option))
+				return 0;
+			sbi->s_resuid = option;
+			break;
+		case Opt_resgid:
+			if (match_int(&args[0], &option))
+				return 0;
+			sbi->s_resgid = option;
+			break;
+		case Opt_sb:
+			/* handled by get_sb_block() instead of here */
+			/* *sb_block = match_int(&args[0]); */
+			break;
+		case Opt_err_panic:
+			clear_opt (sbi->s_mount_opt, ERRORS_CONT);
+			clear_opt (sbi->s_mount_opt, ERRORS_RO);
+			set_opt (sbi->s_mount_opt, ERRORS_PANIC);
+			break;
+		case Opt_err_ro:
+			clear_opt (sbi->s_mount_opt, ERRORS_CONT);
+			clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
+			set_opt (sbi->s_mount_opt, ERRORS_RO);
+			break;
+		case Opt_err_cont:
+			clear_opt (sbi->s_mount_opt, ERRORS_RO);
+			clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
+			set_opt (sbi->s_mount_opt, ERRORS_CONT);
+			break;
+		case Opt_nouid32:
+			set_opt (sbi->s_mount_opt, NO_UID32);
+			break;
+		case Opt_nocheck:
+			clear_opt (sbi->s_mount_opt, CHECK);
+			break;
+		case Opt_debug:
+			set_opt (sbi->s_mount_opt, DEBUG);
+			break;
+		case Opt_oldalloc:
+			set_opt (sbi->s_mount_opt, OLDALLOC);
+			break;
+		case Opt_orlov:
+			clear_opt (sbi->s_mount_opt, OLDALLOC);
+			break;
+#ifdef CONFIG_EXT3_FS_XATTR
+		case Opt_user_xattr:
+			set_opt (sbi->s_mount_opt, XATTR_USER);
+			break;
+		case Opt_nouser_xattr:
+			clear_opt (sbi->s_mount_opt, XATTR_USER);
+			break;
+#else
+		case Opt_user_xattr:
+		case Opt_nouser_xattr:
+			printk("EXT3 (no)user_xattr options not supported\n");
+			break;
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+		case Opt_acl:
+			set_opt(sbi->s_mount_opt, POSIX_ACL);
+			break;
+		case Opt_noacl:
+			clear_opt(sbi->s_mount_opt, POSIX_ACL);
+			break;
+#else
+		case Opt_acl:
+		case Opt_noacl:
+			printk("EXT3 (no)acl options not supported\n");
+			break;
+#endif
+		case Opt_reservation:
+			set_opt(sbi->s_mount_opt, RESERVATION);
+			break;
+		case Opt_noreservation:
+			clear_opt(sbi->s_mount_opt, RESERVATION);
+			break;
+		case Opt_journal_update:
+			/* @@@ FIXME */
+			/* Eventually we will want to be able to create
+			   a journal file here.  For now, only allow the
+			   user to specify an existing inode to be the
+			   journal file. */
+			if (is_remount) {
+				printk(KERN_ERR "EXT3-fs: cannot specify "
+				       "journal on remount\n");
+				return 0;
+			}
+			set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
+			break;
+		case Opt_journal_inum:
+			if (is_remount) {
+				printk(KERN_ERR "EXT3-fs: cannot specify "
+				       "journal on remount\n");
+				return 0;
+			}
+			if (match_int(&args[0], &option))
+				return 0;
+			*inum = option;
+			break;
+		case Opt_journal_dev:
+			if (is_remount) {
+				printk(KERN_ERR "EXT3-fs: cannot specify "
+				       "journal on remount\n");
+				return 0;
+			}
+			if (match_int(&args[0], &option))
+				return 0;
+			*journal_devnum = option;
+			break;
+		case Opt_noload:
+			set_opt (sbi->s_mount_opt, NOLOAD);
+			break;
+		case Opt_commit:
+			if (match_int(&args[0], &option))
+				return 0;
+			if (option < 0)
+				return 0;
+			if (option == 0)
+				option = JBD_DEFAULT_MAX_COMMIT_AGE;
+			sbi->s_commit_interval = HZ * option;
+			break;
+		case Opt_data_journal:
+			data_opt = EXT3_MOUNT_JOURNAL_DATA;
+			goto datacheck;
+		case Opt_data_ordered:
+			data_opt = EXT3_MOUNT_ORDERED_DATA;
+			goto datacheck;
+		case Opt_data_writeback:
+			data_opt = EXT3_MOUNT_WRITEBACK_DATA;
+		datacheck:
+			if (is_remount) {
+				if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
+						!= data_opt) {
+					printk(KERN_ERR
+						"EXT3-fs: cannot change data "
+						"mode on remount\n");
+					return 0;
+				}
+			} else {
+				sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
+				sbi->s_mount_opt |= data_opt;
+			}
+			break;
+#ifdef CONFIG_QUOTA
+		case Opt_usrjquota:
+			qtype = USRQUOTA;
+			goto set_qf_name;
+		case Opt_grpjquota:
+			qtype = GRPQUOTA;
+set_qf_name:
+			if (sb_any_quota_enabled(sb)) {
+				printk(KERN_ERR
+					"EXT3-fs: Cannot change journalled "
+					"quota options when quota turned on.\n");
+				return 0;
+			}
+			qname = match_strdup(&args[0]);
+			if (!qname) {
+				printk(KERN_ERR
+					"EXT3-fs: not enough memory for "
+					"storing quotafile name.\n");
+				return 0;
+			}
+			if (sbi->s_qf_names[qtype] &&
+			    strcmp(sbi->s_qf_names[qtype], qname)) {
+				printk(KERN_ERR
+					"EXT3-fs: %s quota file already "
+					"specified.\n", QTYPE2NAME(qtype));
+				kfree(qname);
+				return 0;
+			}
+			sbi->s_qf_names[qtype] = qname;
+			if (strchr(sbi->s_qf_names[qtype], '/')) {
+				printk(KERN_ERR
+					"EXT3-fs: quotafile must be on "
+					"filesystem root.\n");
+				kfree(sbi->s_qf_names[qtype]);
+				sbi->s_qf_names[qtype] = NULL;
+				return 0;
+			}
+			set_opt(sbi->s_mount_opt, QUOTA);
+			break;
+		case Opt_offusrjquota:
+			qtype = USRQUOTA;
+			goto clear_qf_name;
+		case Opt_offgrpjquota:
+			qtype = GRPQUOTA;
+clear_qf_name:
+			if (sb_any_quota_enabled(sb)) {
+				printk(KERN_ERR "EXT3-fs: Cannot change "
+					"journalled quota options when "
+					"quota turned on.\n");
+				return 0;
+			}
+			/*
+			 * The space will be released later when all options
+			 * are confirmed to be correct
+			 */
+			sbi->s_qf_names[qtype] = NULL;
+			break;
+		case Opt_jqfmt_vfsold:
+			sbi->s_jquota_fmt = QFMT_VFS_OLD;
+			break;
+		case Opt_jqfmt_vfsv0:
+			sbi->s_jquota_fmt = QFMT_VFS_V0;
+			break;
+		case Opt_quota:
+		case Opt_usrquota:
+			set_opt(sbi->s_mount_opt, QUOTA);
+			set_opt(sbi->s_mount_opt, USRQUOTA);
+			break;
+		case Opt_grpquota:
+			set_opt(sbi->s_mount_opt, QUOTA);
+			set_opt(sbi->s_mount_opt, GRPQUOTA);
+			break;
+		case Opt_noquota:
+			if (sb_any_quota_enabled(sb)) {
+				printk(KERN_ERR "EXT3-fs: Cannot change quota "
+					"options when quota turned on.\n");
+				return 0;
+			}
+			clear_opt(sbi->s_mount_opt, QUOTA);
+			clear_opt(sbi->s_mount_opt, USRQUOTA);
+			clear_opt(sbi->s_mount_opt, GRPQUOTA);
+			break;
+#else
+		case Opt_quota:
+		case Opt_usrquota:
+		case Opt_grpquota:
+		case Opt_usrjquota:
+		case Opt_grpjquota:
+		case Opt_offusrjquota:
+		case Opt_offgrpjquota:
+		case Opt_jqfmt_vfsold:
+		case Opt_jqfmt_vfsv0:
+			printk(KERN_ERR
+				"EXT3-fs: journalled quota options not "
+				"supported.\n");
+			break;
+		case Opt_noquota:
+			break;
+#endif
+		case Opt_abort:
+			set_opt(sbi->s_mount_opt, ABORT);
+			break;
+		case Opt_barrier:
+			if (match_int(&args[0], &option))
+				return 0;
+			if (option)
+				set_opt(sbi->s_mount_opt, BARRIER);
+			else
+				clear_opt(sbi->s_mount_opt, BARRIER);
+			break;
+		case Opt_ignore:
+			break;
+		case Opt_resize:
+			if (!is_remount) {
+				printk("EXT3-fs: resize option only available "
+					"for remount\n");
+				return 0;
+			}
+			if (match_int(&args[0], &option) != 0)
+				return 0;
+			*n_blocks_count = option;
+			break;
+		case Opt_nobh:
+			set_opt(sbi->s_mount_opt, NOBH);
+			break;
+		case Opt_bh:
+			clear_opt(sbi->s_mount_opt, NOBH);
+			break;
+		default:
+			printk (KERN_ERR
+				"EXT3-fs: Unrecognized mount option \"%s\" "
+				"or missing value\n", p);
+			return 0;
+		}
+	}
+#ifdef CONFIG_QUOTA
+	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
+		if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
+		     sbi->s_qf_names[USRQUOTA])
+			clear_opt(sbi->s_mount_opt, USRQUOTA);
+
+		if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
+		     sbi->s_qf_names[GRPQUOTA])
+			clear_opt(sbi->s_mount_opt, GRPQUOTA);
+
+		if ((sbi->s_qf_names[USRQUOTA] &&
+				(sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
+		    (sbi->s_qf_names[GRPQUOTA] &&
+				(sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
+			printk(KERN_ERR "EXT3-fs: old and new quota "
+					"format mixing.\n");
+			return 0;
+		}
+
+		if (!sbi->s_jquota_fmt) {
+			printk(KERN_ERR "EXT3-fs: journalled quota format "
+					"not specified.\n");
+			return 0;
+		}
+	} else {
+		if (sbi->s_jquota_fmt) {
+			printk(KERN_ERR "EXT3-fs: journalled quota format "
+					"specified with no journalling "
+					"enabled.\n");
+			return 0;
+		}
+	}
+#endif
+	return 1;
+}
+
+static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
+			    int read_only)
+{
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	int res = 0;
+
+	if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
+		printk (KERN_ERR "EXT3-fs warning: revision level too high, "
+			"forcing read-only mode\n");
+		res = MS_RDONLY;
+	}
+	if (read_only)
+		return res;
+	if (!(sbi->s_mount_state & EXT3_VALID_FS))
+		printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
+			"running e2fsck is recommended\n");
+	else if ((sbi->s_mount_state & EXT3_ERROR_FS))
+		printk (KERN_WARNING
+			"EXT3-fs warning: mounting fs with errors, "
+			"running e2fsck is recommended\n");
+	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
+		 le16_to_cpu(es->s_mnt_count) >=
+		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
+		printk (KERN_WARNING
+			"EXT3-fs warning: maximal mount count reached, "
+			"running e2fsck is recommended\n");
+	else if (le32_to_cpu(es->s_checkinterval) &&
+		(le32_to_cpu(es->s_lastcheck) +
+			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
+		printk (KERN_WARNING
+			"EXT3-fs warning: checktime reached, "
+			"running e2fsck is recommended\n");
+#if 0
+		/* @@@ We _will_ want to clear the valid bit if we find
+                   inconsistencies, to force a fsck at reboot.  But for
+                   a plain journaled filesystem we can keep it set as
+                   valid forever! :) */
+	es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
+#endif
+	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
+		es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
+	es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
+	es->s_mtime = cpu_to_le32(get_seconds());
+	ext3_update_dynamic_rev(sb);
+	EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+
+	ext3_commit_super(sb, es, 1);
+	if (test_opt(sb, DEBUG))
+		printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
+				"bpg=%lu, ipg=%lu, mo=%04lx]\n",
+			sb->s_blocksize,
+			sbi->s_groups_count,
+			EXT3_BLOCKS_PER_GROUP(sb),
+			EXT3_INODES_PER_GROUP(sb),
+			sbi->s_mount_opt);
+
+	printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
+	if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
+		char b[BDEVNAME_SIZE];
+
+		printk("external journal on %s\n",
+			bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
+	} else {
+		printk("internal journal\n");
+	}
+	return res;
+}
+
+/* Called at mount-time, super-block is locked */
+static int ext3_check_descriptors (struct super_block * sb)
+{
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
+	ext3_fsblk_t last_block;
+	struct ext3_group_desc * gdp = NULL;
+	int desc_block = 0;
+	int i;
+
+	ext3_debug ("Checking group descriptors");
+
+	for (i = 0; i < sbi->s_groups_count; i++)
+	{
+		if (i == sbi->s_groups_count - 1)
+			last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
+		else
+			last_block = first_block +
+				(EXT3_BLOCKS_PER_GROUP(sb) - 1);
+
+		if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
+			gdp = (struct ext3_group_desc *)
+					sbi->s_group_desc[desc_block++]->b_data;
+		if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
+		    le32_to_cpu(gdp->bg_block_bitmap) > last_block)
+		{
+			ext3_error (sb, "ext3_check_descriptors",
+				    "Block bitmap for group %d"
+				    " not in group (block %lu)!",
+				    i, (unsigned long)
+					le32_to_cpu(gdp->bg_block_bitmap));
+			return 0;
+		}
+		if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
+		    le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
+		{
+			ext3_error (sb, "ext3_check_descriptors",
+				    "Inode bitmap for group %d"
+				    " not in group (block %lu)!",
+				    i, (unsigned long)
+					le32_to_cpu(gdp->bg_inode_bitmap));
+			return 0;
+		}
+		if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
+		    le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
+		    last_block)
+		{
+			ext3_error (sb, "ext3_check_descriptors",
+				    "Inode table for group %d"
+				    " not in group (block %lu)!",
+				    i, (unsigned long)
+					le32_to_cpu(gdp->bg_inode_table));
+			return 0;
+		}
+		first_block += EXT3_BLOCKS_PER_GROUP(sb);
+		gdp++;
+	}
+
+	sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
+	sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
+	return 1;
+}
+
+
+/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
+ * the superblock) which were deleted from all directories, but held open by
+ * a process at the time of a crash.  We walk the list and try to delete these
+ * inodes at recovery time (only with a read-write filesystem).
+ *
+ * In order to keep the orphan inode chain consistent during traversal (in
+ * case of crash during recovery), we link each inode into the superblock
+ * orphan list_head and handle it the same way as an inode deletion during
+ * normal operation (which journals the operations for us).
+ *
+ * We only do an iget() and an iput() on each inode, which is very safe if we
+ * accidentally point at an in-use or already deleted inode.  The worst that
+ * can happen in this case is that we get a "bit already cleared" message from
+ * ext3_free_inode().  The only reason we would point at a wrong inode is if
+ * e2fsck was run on this filesystem, and it must have already done the orphan
+ * inode cleanup for us, so we can safely abort without any further action.
+ */
+static void ext3_orphan_cleanup (struct super_block * sb,
+				 struct ext3_super_block * es)
+{
+	unsigned int s_flags = sb->s_flags;
+	int nr_orphans = 0, nr_truncates = 0;
+#ifdef CONFIG_QUOTA
+	int i;
+#endif
+	if (!es->s_last_orphan) {
+		jbd_debug(4, "no orphan inodes to clean up\n");
+		return;
+	}
+
+	if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
+		if (es->s_last_orphan)
+			jbd_debug(1, "Errors on filesystem, "
+				  "clearing orphan list.\n");
+		es->s_last_orphan = 0;
+		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
+		return;
+	}
+
+	if (s_flags & MS_RDONLY) {
+		printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
+		       sb->s_id);
+		sb->s_flags &= ~MS_RDONLY;
+	}
+#ifdef CONFIG_QUOTA
+	/* Needed for iput() to work correctly and not trash data */
+	sb->s_flags |= MS_ACTIVE;
+	/* Turn on quotas so that they are updated correctly */
+	for (i = 0; i < MAXQUOTAS; i++) {
+		if (EXT3_SB(sb)->s_qf_names[i]) {
+			int ret = ext3_quota_on_mount(sb, i);
+			if (ret < 0)
+				printk(KERN_ERR
+					"EXT3-fs: Cannot turn on journalled "
+					"quota: error %d\n", ret);
+		}
+	}
+#endif
+
+	while (es->s_last_orphan) {
+		struct inode *inode;
+
+		if (!(inode =
+		      ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
+			es->s_last_orphan = 0;
+			break;
+		}
+
+		list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
+		DQUOT_INIT(inode);
+		if (inode->i_nlink) {
+			printk(KERN_DEBUG
+				"%s: truncating inode %lu to %Ld bytes\n",
+				__FUNCTION__, inode->i_ino, inode->i_size);
+			jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
+				  inode->i_ino, inode->i_size);
+			ext3_truncate(inode);
+			nr_truncates++;
+		} else {
+			printk(KERN_DEBUG
+				"%s: deleting unreferenced inode %lu\n",
+				__FUNCTION__, inode->i_ino);
+			jbd_debug(2, "deleting unreferenced inode %lu\n",
+				  inode->i_ino);
+			nr_orphans++;
+		}
+		iput(inode);  /* The delete magic happens here! */
+	}
+
+#define PLURAL(x) (x), ((x)==1) ? "" : "s"
+
+	if (nr_orphans)
+		printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
+		       sb->s_id, PLURAL(nr_orphans));
+	if (nr_truncates)
+		printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
+		       sb->s_id, PLURAL(nr_truncates));
+#ifdef CONFIG_QUOTA
+	/* Turn quotas off */
+	for (i = 0; i < MAXQUOTAS; i++) {
+		if (sb_dqopt(sb)->files[i])
+			vfs_quota_off(sb, i);
+	}
+#endif
+	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
+}
+
+#define log2(n) ffz(~(n))
+
+/*
+ * Maximal file size.  There is a direct, and {,double-,triple-}indirect
+ * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
+ * We need to be 1 filesystem block less than the 2^32 sector limit.
+ */
+static loff_t ext3_max_size(int bits)
+{
+	loff_t res = EXT3_NDIR_BLOCKS;
+	/* This constant is calculated to be the largest file size for a
+	 * dense, 4k-blocksize file such that the total number of
+	 * sectors in the file, including data and all indirect blocks,
+	 * does not exceed 2^32. */
+	const loff_t upper_limit = 0x1ff7fffd000LL;
+
+	res += 1LL << (bits-2);
+	res += 1LL << (2*(bits-2));
+	res += 1LL << (3*(bits-2));
+	res <<= bits;
+	if (res > upper_limit)
+		res = upper_limit;
+	return res;
+}
+
+static ext3_fsblk_t descriptor_loc(struct super_block *sb,
+				    ext3_fsblk_t logic_sb_block,
+				    int nr)
+{
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	unsigned long bg, first_meta_bg;
+	int has_super = 0;
+
+	first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
+
+	if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
+	    nr < first_meta_bg)
+		return (logic_sb_block + nr + 1);
+	bg = sbi->s_desc_per_block * nr;
+	if (ext3_bg_has_super(sb, bg))
+		has_super = 1;
+	return (has_super + ext3_group_first_block_no(sb, bg));
+}
+
+
+static int ext3_fill_super (struct super_block *sb, void *data, int silent)
+{
+	struct buffer_head * bh;
+	struct ext3_super_block *es = NULL;
+	struct ext3_sb_info *sbi;
+	ext3_fsblk_t block;
+	ext3_fsblk_t sb_block = get_sb_block(&data);
+	ext3_fsblk_t logic_sb_block;
+	unsigned long offset = 0;
+	unsigned int journal_inum = 0;
+	unsigned long journal_devnum = 0;
+	unsigned long def_mount_opts;
+	struct inode *root;
+	int blocksize;
+	int hblock;
+	int db_count;
+	int i;
+	int needs_recovery;
+	__le32 features;
+
+	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+	sb->s_fs_info = sbi;
+	sbi->s_mount_opt = 0;
+	sbi->s_resuid = EXT3_DEF_RESUID;
+	sbi->s_resgid = EXT3_DEF_RESGID;
+
+	unlock_kernel();
+
+	blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
+	if (!blocksize) {
+		printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
+		goto out_fail;
+	}
+
+	/*
+	 * The ext3 superblock will not be buffer aligned for other than 1kB
+	 * block sizes.  We need to calculate the offset from buffer start.
+	 */
+	if (blocksize != EXT3_MIN_BLOCK_SIZE) {
+		logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
+		offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
+	} else {
+		logic_sb_block = sb_block;
+	}
+
+	if (!(bh = sb_bread(sb, logic_sb_block))) {
+		printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
+		goto out_fail;
+	}
+	/*
+	 * Note: s_es must be initialized as soon as possible because
+	 *       some ext3 macro-instructions depend on its value
+	 */
+	es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
+	sbi->s_es = es;
+	sb->s_magic = le16_to_cpu(es->s_magic);
+	if (sb->s_magic != EXT3_SUPER_MAGIC)
+		goto cantfind_ext3;
+
+	/* Set defaults before we parse the mount options */
+	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+	if (def_mount_opts & EXT3_DEFM_DEBUG)
+		set_opt(sbi->s_mount_opt, DEBUG);
+	if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
+		set_opt(sbi->s_mount_opt, GRPID);
+	if (def_mount_opts & EXT3_DEFM_UID16)
+		set_opt(sbi->s_mount_opt, NO_UID32);
+	if (def_mount_opts & EXT3_DEFM_XATTR_USER)
+		set_opt(sbi->s_mount_opt, XATTR_USER);
+	if (def_mount_opts & EXT3_DEFM_ACL)
+		set_opt(sbi->s_mount_opt, POSIX_ACL);
+	if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
+		sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
+	else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
+		sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
+	else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
+		sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
+
+	if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
+		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
+	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
+		set_opt(sbi->s_mount_opt, ERRORS_RO);
+
+	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
+	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
+
+	set_opt(sbi->s_mount_opt, RESERVATION);
+
+	if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
+			    NULL, 0))
+		goto failed_mount;
+
+	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+		((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
+
+	if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
+	    (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
+	     EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
+	     EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
+		printk(KERN_WARNING
+		       "EXT3-fs warning: feature flags set on rev 0 fs, "
+		       "running e2fsck is recommended\n");
+	/*
+	 * Check feature flags regardless of the revision level, since we
+	 * previously didn't change the revision level when setting the flags,
+	 * so there is a chance incompat flags are set on a rev 0 filesystem.
+	 */
+	features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
+	if (features) {
+		printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
+		       "unsupported optional features (%x).\n",
+		       sb->s_id, le32_to_cpu(features));
+		goto failed_mount;
+	}
+	features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
+	if (!(sb->s_flags & MS_RDONLY) && features) {
+		printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
+		       "unsupported optional features (%x).\n",
+		       sb->s_id, le32_to_cpu(features));
+		goto failed_mount;
+	}
+	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
+
+	if (blocksize < EXT3_MIN_BLOCK_SIZE ||
+	    blocksize > EXT3_MAX_BLOCK_SIZE) {
+		printk(KERN_ERR
+		       "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
+		       blocksize, sb->s_id);
+		goto failed_mount;
+	}
+
+	hblock = bdev_hardsect_size(sb->s_bdev);
+	if (sb->s_blocksize != blocksize) {
+		/*
+		 * Make sure the blocksize for the filesystem is larger
+		 * than the hardware sectorsize for the machine.
+		 */
+		if (blocksize < hblock) {
+			printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
+			       "device blocksize %d.\n", blocksize, hblock);
+			goto failed_mount;
+		}
+
+		brelse (bh);
+		sb_set_blocksize(sb, blocksize);
+		logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
+		offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
+		bh = sb_bread(sb, logic_sb_block);
+		if (!bh) {
+			printk(KERN_ERR
+			       "EXT3-fs: Can't read superblock on 2nd try.\n");
+			goto failed_mount;
+		}
+		es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
+		sbi->s_es = es;
+		if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
+			printk (KERN_ERR
+				"EXT3-fs: Magic mismatch, very weird !\n");
+			goto failed_mount;
+		}
+	}
+
+	sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
+
+	if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
+		sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
+		sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
+	} else {
+		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
+		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
+		if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
+		    (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
+		    (sbi->s_inode_size > blocksize)) {
+			printk (KERN_ERR
+				"EXT3-fs: unsupported inode size: %d\n",
+				sbi->s_inode_size);
+			goto failed_mount;
+		}
+	}
+	sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
+				   le32_to_cpu(es->s_log_frag_size);
+	if (blocksize != sbi->s_frag_size) {
+		printk(KERN_ERR
+		       "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
+		       sbi->s_frag_size, blocksize);
+		goto failed_mount;
+	}
+	sbi->s_frags_per_block = 1;
+	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
+	sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
+	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
+	if (EXT3_INODE_SIZE(sb) == 0)
+		goto cantfind_ext3;
+	sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
+	if (sbi->s_inodes_per_block == 0)
+		goto cantfind_ext3;
+	sbi->s_itb_per_group = sbi->s_inodes_per_group /
+					sbi->s_inodes_per_block;
+	sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
+	sbi->s_sbh = bh;
+	sbi->s_mount_state = le16_to_cpu(es->s_state);
+	sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
+	sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
+	for (i=0; i < 4; i++)
+		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
+	sbi->s_def_hash_version = es->s_def_hash_version;
+
+	if (sbi->s_blocks_per_group > blocksize * 8) {
+		printk (KERN_ERR
+			"EXT3-fs: #blocks per group too big: %lu\n",
+			sbi->s_blocks_per_group);
+		goto failed_mount;
+	}
+	if (sbi->s_frags_per_group > blocksize * 8) {
+		printk (KERN_ERR
+			"EXT3-fs: #fragments per group too big: %lu\n",
+			sbi->s_frags_per_group);
+		goto failed_mount;
+	}
+	if (sbi->s_inodes_per_group > blocksize * 8) {
+		printk (KERN_ERR
+			"EXT3-fs: #inodes per group too big: %lu\n",
+			sbi->s_inodes_per_group);
+		goto failed_mount;
+	}
+
+	if (le32_to_cpu(es->s_blocks_count) >
+		    (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
+		printk(KERN_ERR "EXT3-fs: filesystem on %s:"
+			" too large to mount safely\n", sb->s_id);
+		if (sizeof(sector_t) < 8)
+			printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
+					"enabled\n");
+		goto failed_mount;
+	}
+
+	if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
+		goto cantfind_ext3;
+	sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
+			       le32_to_cpu(es->s_first_data_block) - 1)
+				       / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
+	db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
+		   EXT3_DESC_PER_BLOCK(sb);
+	sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
+				    GFP_KERNEL);
+	if (sbi->s_group_desc == NULL) {
+		printk (KERN_ERR "EXT3-fs: not enough memory\n");
+		goto failed_mount;
+	}
+
+	bgl_lock_init(&sbi->s_blockgroup_lock);
+
+	for (i = 0; i < db_count; i++) {
+		block = descriptor_loc(sb, logic_sb_block, i);
+		sbi->s_group_desc[i] = sb_bread(sb, block);
+		if (!sbi->s_group_desc[i]) {
+			printk (KERN_ERR "EXT3-fs: "
+				"can't read group descriptor %d\n", i);
+			db_count = i;
+			goto failed_mount2;
+		}
+	}
+	if (!ext3_check_descriptors (sb)) {
+		printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
+		goto failed_mount2;
+	}
+	sbi->s_gdb_count = db_count;
+	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
+	spin_lock_init(&sbi->s_next_gen_lock);
+
+	percpu_counter_init(&sbi->s_freeblocks_counter,
+		ext3_count_free_blocks(sb));
+	percpu_counter_init(&sbi->s_freeinodes_counter,
+		ext3_count_free_inodes(sb));
+	percpu_counter_init(&sbi->s_dirs_counter,
+		ext3_count_dirs(sb));
+
+	/* per fileystem reservation list head & lock */
+	spin_lock_init(&sbi->s_rsv_window_lock);
+	sbi->s_rsv_window_root = RB_ROOT;
+	/* Add a single, static dummy reservation to the start of the
+	 * reservation window list --- it gives us a placeholder for
+	 * append-at-start-of-list which makes the allocation logic
+	 * _much_ simpler. */
+	sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
+	sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
+	sbi->s_rsv_window_head.rsv_alloc_hit = 0;
+	sbi->s_rsv_window_head.rsv_goal_size = 0;
+	ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
+
+	/*
+	 * set up enough so that it can read an inode
+	 */
+	sb->s_op = &ext3_sops;
+	sb->s_export_op = &ext3_export_ops;
+	sb->s_xattr = ext3_xattr_handlers;
+#ifdef CONFIG_QUOTA
+	sb->s_qcop = &ext3_qctl_operations;
+	sb->dq_op = &ext3_quota_operations;
+#endif
+	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
+
+	sb->s_root = NULL;
+
+	needs_recovery = (es->s_last_orphan != 0 ||
+			  EXT3_HAS_INCOMPAT_FEATURE(sb,
+				    EXT3_FEATURE_INCOMPAT_RECOVER));
+
+	/*
+	 * The first inode we look at is the journal inode.  Don't try
+	 * root first: it may be modified in the journal!
+	 */
+	if (!test_opt(sb, NOLOAD) &&
+	    EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
+		if (ext3_load_journal(sb, es, journal_devnum))
+			goto failed_mount3;
+	} else if (journal_inum) {
+		if (ext3_create_journal(sb, es, journal_inum))
+			goto failed_mount3;
+	} else {
+		if (!silent)
+			printk (KERN_ERR
+				"ext3: No journal on filesystem on %s\n",
+				sb->s_id);
+		goto failed_mount3;
+	}
+
+	/* We have now updated the journal if required, so we can
+	 * validate the data journaling mode. */
+	switch (test_opt(sb, DATA_FLAGS)) {
+	case 0:
+		/* No mode set, assume a default based on the journal
+                   capabilities: ORDERED_DATA if the journal can
+                   cope, else JOURNAL_DATA */
+		if (journal_check_available_features
+		    (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
+			set_opt(sbi->s_mount_opt, ORDERED_DATA);
+		else
+			set_opt(sbi->s_mount_opt, JOURNAL_DATA);
+		break;
+
+	case EXT3_MOUNT_ORDERED_DATA:
+	case EXT3_MOUNT_WRITEBACK_DATA:
+		if (!journal_check_available_features
+		    (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
+			printk(KERN_ERR "EXT3-fs: Journal does not support "
+			       "requested data journaling mode\n");
+			goto failed_mount4;
+		}
+	default:
+		break;
+	}
+
+	if (test_opt(sb, NOBH)) {
+		if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
+			printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
+				"its supported only with writeback mode\n");
+			clear_opt(sbi->s_mount_opt, NOBH);
+		}
+	}
+	/*
+	 * The journal_load will have done any necessary log recovery,
+	 * so we can safely mount the rest of the filesystem now.
+	 */
+
+	root = iget(sb, EXT3_ROOT_INO);
+	sb->s_root = d_alloc_root(root);
+	if (!sb->s_root) {
+		printk(KERN_ERR "EXT3-fs: get root inode failed\n");
+		iput(root);
+		goto failed_mount4;
+	}
+	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
+		dput(sb->s_root);
+		sb->s_root = NULL;
+		printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
+		goto failed_mount4;
+	}
+
+	ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
+	/*
+	 * akpm: core read_super() calls in here with the superblock locked.
+	 * That deadlocks, because orphan cleanup needs to lock the superblock
+	 * in numerous places.  Here we just pop the lock - it's relatively
+	 * harmless, because we are now ready to accept write_super() requests,
+	 * and aviro says that's the only reason for hanging onto the
+	 * superblock lock.
+	 */
+	EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
+	ext3_orphan_cleanup(sb, es);
+	EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
+	if (needs_recovery)
+		printk (KERN_INFO "EXT3-fs: recovery complete.\n");
+	ext3_mark_recovery_complete(sb, es);
+	printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
+		test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
+		test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
+		"writeback");
+
+	lock_kernel();
+	return 0;
+
+cantfind_ext3:
+	if (!silent)
+		printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
+		       sb->s_id);
+	goto failed_mount;
+
+failed_mount4:
+	journal_destroy(sbi->s_journal);
+failed_mount3:
+	percpu_counter_destroy(&sbi->s_freeblocks_counter);
+	percpu_counter_destroy(&sbi->s_freeinodes_counter);
+	percpu_counter_destroy(&sbi->s_dirs_counter);
+failed_mount2:
+	for (i = 0; i < db_count; i++)
+		brelse(sbi->s_group_desc[i]);
+	kfree(sbi->s_group_desc);
+failed_mount:
+#ifdef CONFIG_QUOTA
+	for (i = 0; i < MAXQUOTAS; i++)
+		kfree(sbi->s_qf_names[i]);
+#endif
+	ext3_blkdev_remove(sbi);
+	brelse(bh);
+out_fail:
+	sb->s_fs_info = NULL;
+	kfree(sbi);
+	lock_kernel();
+	return -EINVAL;
+}
+
+/*
+ * Setup any per-fs journal parameters now.  We'll do this both on
+ * initial mount, once the journal has been initialised but before we've
+ * done any recovery; and again on any subsequent remount.
+ */
+static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
+{
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+
+	if (sbi->s_commit_interval)
+		journal->j_commit_interval = sbi->s_commit_interval;
+	/* We could also set up an ext3-specific default for the commit
+	 * interval here, but for now we'll just fall back to the jbd
+	 * default. */
+
+	spin_lock(&journal->j_state_lock);
+	if (test_opt(sb, BARRIER))
+		journal->j_flags |= JFS_BARRIER;
+	else
+		journal->j_flags &= ~JFS_BARRIER;
+	spin_unlock(&journal->j_state_lock);
+}
+
+static journal_t *ext3_get_journal(struct super_block *sb,
+				   unsigned int journal_inum)
+{
+	struct inode *journal_inode;
+	journal_t *journal;
+
+	/* First, test for the existence of a valid inode on disk.  Bad
+	 * things happen if we iget() an unused inode, as the subsequent
+	 * iput() will try to delete it. */
+
+	journal_inode = iget(sb, journal_inum);
+	if (!journal_inode) {
+		printk(KERN_ERR "EXT3-fs: no journal found.\n");
+		return NULL;
+	}
+	if (!journal_inode->i_nlink) {
+		make_bad_inode(journal_inode);
+		iput(journal_inode);
+		printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
+		return NULL;
+	}
+
+	jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
+		  journal_inode, journal_inode->i_size);
+	if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
+		printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
+		iput(journal_inode);
+		return NULL;
+	}
+
+	journal = journal_init_inode(journal_inode);
+	if (!journal) {
+		printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
+		iput(journal_inode);
+		return NULL;
+	}
+	journal->j_private = sb;
+	ext3_init_journal_params(sb, journal);
+	return journal;
+}
+
+static journal_t *ext3_get_dev_journal(struct super_block *sb,
+				       dev_t j_dev)
+{
+	struct buffer_head * bh;
+	journal_t *journal;
+	ext3_fsblk_t start;
+	ext3_fsblk_t len;
+	int hblock, blocksize;
+	ext3_fsblk_t sb_block;
+	unsigned long offset;
+	struct ext3_super_block * es;
+	struct block_device *bdev;
+
+	bdev = ext3_blkdev_get(j_dev);
+	if (bdev == NULL)
+		return NULL;
+
+	if (bd_claim(bdev, sb)) {
+		printk(KERN_ERR
+		        "EXT3: failed to claim external journal device.\n");
+		blkdev_put(bdev);
+		return NULL;
+	}
+
+	blocksize = sb->s_blocksize;
+	hblock = bdev_hardsect_size(bdev);
+	if (blocksize < hblock) {
+		printk(KERN_ERR
+			"EXT3-fs: blocksize too small for journal device.\n");
+		goto out_bdev;
+	}
+
+	sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
+	offset = EXT3_MIN_BLOCK_SIZE % blocksize;
+	set_blocksize(bdev, blocksize);
+	if (!(bh = __bread(bdev, sb_block, blocksize))) {
+		printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
+		       "external journal\n");
+		goto out_bdev;
+	}
+
+	es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
+	if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
+	    !(le32_to_cpu(es->s_feature_incompat) &
+	      EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
+		printk(KERN_ERR "EXT3-fs: external journal has "
+					"bad superblock\n");
+		brelse(bh);
+		goto out_bdev;
+	}
+
+	if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
+		printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
+		brelse(bh);
+		goto out_bdev;
+	}
+
+	len = le32_to_cpu(es->s_blocks_count);
+	start = sb_block + 1;
+	brelse(bh);	/* we're done with the superblock */
+
+	journal = journal_init_dev(bdev, sb->s_bdev,
+					start, len, blocksize);
+	if (!journal) {
+		printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
+		goto out_bdev;
+	}
+	journal->j_private = sb;
+	ll_rw_block(READ, 1, &journal->j_sb_buffer);
+	wait_on_buffer(journal->j_sb_buffer);
+	if (!buffer_uptodate(journal->j_sb_buffer)) {
+		printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
+		goto out_journal;
+	}
+	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
+		printk(KERN_ERR "EXT3-fs: External journal has more than one "
+					"user (unsupported) - %d\n",
+			be32_to_cpu(journal->j_superblock->s_nr_users));
+		goto out_journal;
+	}
+	EXT3_SB(sb)->journal_bdev = bdev;
+	ext3_init_journal_params(sb, journal);
+	return journal;
+out_journal:
+	journal_destroy(journal);
+out_bdev:
+	ext3_blkdev_put(bdev);
+	return NULL;
+}
+
+static int ext3_load_journal(struct super_block *sb,
+			     struct ext3_super_block *es,
+			     unsigned long journal_devnum)
+{
+	journal_t *journal;
+	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
+	dev_t journal_dev;
+	int err = 0;
+	int really_read_only;
+
+	if (journal_devnum &&
+	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+		printk(KERN_INFO "EXT3-fs: external journal device major/minor "
+			"numbers have changed\n");
+		journal_dev = new_decode_dev(journal_devnum);
+	} else
+		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
+
+	really_read_only = bdev_read_only(sb->s_bdev);
+
+	/*
+	 * Are we loading a blank journal or performing recovery after a
+	 * crash?  For recovery, we need to check in advance whether we
+	 * can get read-write access to the device.
+	 */
+
+	if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
+		if (sb->s_flags & MS_RDONLY) {
+			printk(KERN_INFO "EXT3-fs: INFO: recovery "
+					"required on readonly filesystem.\n");
+			if (really_read_only) {
+				printk(KERN_ERR "EXT3-fs: write access "
+					"unavailable, cannot proceed.\n");
+				return -EROFS;
+			}
+			printk (KERN_INFO "EXT3-fs: write access will "
+					"be enabled during recovery.\n");
+		}
+	}
+
+	if (journal_inum && journal_dev) {
+		printk(KERN_ERR "EXT3-fs: filesystem has both journal "
+		       "and inode journals!\n");
+		return -EINVAL;
+	}
+
+	if (journal_inum) {
+		if (!(journal = ext3_get_journal(sb, journal_inum)))
+			return -EINVAL;
+	} else {
+		if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
+			return -EINVAL;
+	}
+
+	if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
+		err = journal_update_format(journal);
+		if (err)  {
+			printk(KERN_ERR "EXT3-fs: error updating journal.\n");
+			journal_destroy(journal);
+			return err;
+		}
+	}
+
+	if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
+		err = journal_wipe(journal, !really_read_only);
+	if (!err)
+		err = journal_load(journal);
+
+	if (err) {
+		printk(KERN_ERR "EXT3-fs: error loading journal.\n");
+		journal_destroy(journal);
+		return err;
+	}
+
+	EXT3_SB(sb)->s_journal = journal;
+	ext3_clear_journal_err(sb, es);
+
+	if (journal_devnum &&
+	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+		es->s_journal_dev = cpu_to_le32(journal_devnum);
+		sb->s_dirt = 1;
+
+		/* Make sure we flush the recovery flag to disk. */
+		ext3_commit_super(sb, es, 1);
+	}
+
+	return 0;
+}
+
+static int ext3_create_journal(struct super_block * sb,
+			       struct ext3_super_block * es,
+			       unsigned int journal_inum)
+{
+	journal_t *journal;
+
+	if (sb->s_flags & MS_RDONLY) {
+		printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
+				"create journal.\n");
+		return -EROFS;
+	}
+
+	if (!(journal = ext3_get_journal(sb, journal_inum)))
+		return -EINVAL;
+
+	printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
+	       journal_inum);
+
+	if (journal_create(journal)) {
+		printk(KERN_ERR "EXT3-fs: error creating journal.\n");
+		journal_destroy(journal);
+		return -EIO;
+	}
+
+	EXT3_SB(sb)->s_journal = journal;
+
+	ext3_update_dynamic_rev(sb);
+	EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+	EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
+
+	es->s_journal_inum = cpu_to_le32(journal_inum);
+	sb->s_dirt = 1;
+
+	/* Make sure we flush the recovery flag to disk. */
+	ext3_commit_super(sb, es, 1);
+
+	return 0;
+}
+
+static void ext3_commit_super (struct super_block * sb,
+			       struct ext3_super_block * es,
+			       int sync)
+{
+	struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
+
+	if (!sbh)
+		return;
+	es->s_wtime = cpu_to_le32(get_seconds());
+	es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
+	es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
+	BUFFER_TRACE(sbh, "marking dirty");
+	mark_buffer_dirty(sbh);
+	if (sync)
+		sync_dirty_buffer(sbh);
+}
+
+
+/*
+ * Have we just finished recovery?  If so, and if we are mounting (or
+ * remounting) the filesystem readonly, then we will end up with a
+ * consistent fs on disk.  Record that fact.
+ */
+static void ext3_mark_recovery_complete(struct super_block * sb,
+					struct ext3_super_block * es)
+{
+	journal_t *journal = EXT3_SB(sb)->s_journal;
+
+	journal_lock_updates(journal);
+	journal_flush(journal);
+	if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
+	    sb->s_flags & MS_RDONLY) {
+		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+		sb->s_dirt = 0;
+		ext3_commit_super(sb, es, 1);
+	}
+	journal_unlock_updates(journal);
+}
+
+/*
+ * If we are mounting (or read-write remounting) a filesystem whose journal
+ * has recorded an error from a previous lifetime, move that error to the
+ * main filesystem now.
+ */
+static void ext3_clear_journal_err(struct super_block * sb,
+				   struct ext3_super_block * es)
+{
+	journal_t *journal;
+	int j_errno;
+	const char *errstr;
+
+	journal = EXT3_SB(sb)->s_journal;
+
+	/*
+	 * Now check for any error status which may have been recorded in the
+	 * journal by a prior ext3_error() or ext3_abort()
+	 */
+
+	j_errno = journal_errno(journal);
+	if (j_errno) {
+		char nbuf[16];
+
+		errstr = ext3_decode_error(sb, j_errno, nbuf);
+		ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
+			     "from previous mount: %s", errstr);
+		ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
+			     "filesystem check.");
+
+		EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
+		es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
+		ext3_commit_super (sb, es, 1);
+
+		journal_clear_err(journal);
+	}
+}
+
+/*
+ * Force the running and committing transactions to commit,
+ * and wait on the commit.
+ */
+int ext3_force_commit(struct super_block *sb)
+{
+	journal_t *journal;
+	int ret;
+
+	if (sb->s_flags & MS_RDONLY)
+		return 0;
+
+	journal = EXT3_SB(sb)->s_journal;
+	sb->s_dirt = 0;
+	ret = ext3_journal_force_commit(journal);
+	return ret;
+}
+
+/*
+ * Ext3 always journals updates to the superblock itself, so we don't
+ * have to propagate any other updates to the superblock on disk at this
+ * point.  Just start an async writeback to get the buffers on their way
+ * to the disk.
+ *
+ * This implicitly triggers the writebehind on sync().
+ */
+
+static void ext3_write_super (struct super_block * sb)
+{
+	if (mutex_trylock(&sb->s_lock) != 0)
+		BUG();
+	sb->s_dirt = 0;
+}
+
+static int ext3_sync_fs(struct super_block *sb, int wait)
+{
+	tid_t target;
+
+	sb->s_dirt = 0;
+	if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
+		if (wait)
+			log_wait_commit(EXT3_SB(sb)->s_journal, target);
+	}
+	return 0;
+}
+
+/*
+ * LVM calls this function before a (read-only) snapshot is created.  This
+ * gives us a chance to flush the journal completely and mark the fs clean.
+ */
+static void ext3_write_super_lockfs(struct super_block *sb)
+{
+	sb->s_dirt = 0;
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		journal_t *journal = EXT3_SB(sb)->s_journal;
+
+		/* Now we set up the journal barrier. */
+		journal_lock_updates(journal);
+		journal_flush(journal);
+
+		/* Journal blocked and flushed, clear needs_recovery flag. */
+		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+		ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+	}
+}
+
+/*
+ * Called by LVM after the snapshot is done.  We need to reset the RECOVER
+ * flag here, even though the filesystem is not technically dirty yet.
+ */
+static void ext3_unlockfs(struct super_block *sb)
+{
+	if (!(sb->s_flags & MS_RDONLY)) {
+		lock_super(sb);
+		/* Reser the needs_recovery flag before the fs is unlocked. */
+		EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+		ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+		unlock_super(sb);
+		journal_unlock_updates(EXT3_SB(sb)->s_journal);
+	}
+}
+
+static int ext3_remount (struct super_block * sb, int * flags, char * data)
+{
+	struct ext3_super_block * es;
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	ext3_fsblk_t n_blocks_count = 0;
+	unsigned long old_sb_flags;
+	struct ext3_mount_options old_opts;
+	int err;
+#ifdef CONFIG_QUOTA
+	int i;
+#endif
+
+	/* Store the original options */
+	old_sb_flags = sb->s_flags;
+	old_opts.s_mount_opt = sbi->s_mount_opt;
+	old_opts.s_resuid = sbi->s_resuid;
+	old_opts.s_resgid = sbi->s_resgid;
+	old_opts.s_commit_interval = sbi->s_commit_interval;
+#ifdef CONFIG_QUOTA
+	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
+	for (i = 0; i < MAXQUOTAS; i++)
+		old_opts.s_qf_names[i] = sbi->s_qf_names[i];
+#endif
+
+	/*
+	 * Allow the "check" option to be passed as a remount option.
+	 */
+	if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
+		err = -EINVAL;
+		goto restore_opts;
+	}
+
+	if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
+		ext3_abort(sb, __FUNCTION__, "Abort forced by user");
+
+	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+		((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
+
+	es = sbi->s_es;
+
+	ext3_init_journal_params(sb, sbi->s_journal);
+
+	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
+		n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
+		if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
+			err = -EROFS;
+			goto restore_opts;
+		}
+
+		if (*flags & MS_RDONLY) {
+			/*
+			 * First of all, the unconditional stuff we have to do
+			 * to disable replay of the journal when we next remount
+			 */
+			sb->s_flags |= MS_RDONLY;
+
+			/*
+			 * OK, test if we are remounting a valid rw partition
+			 * readonly, and if so set the rdonly flag and then
+			 * mark the partition as valid again.
+			 */
+			if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
+			    (sbi->s_mount_state & EXT3_VALID_FS))
+				es->s_state = cpu_to_le16(sbi->s_mount_state);
+
+			ext3_mark_recovery_complete(sb, es);
+		} else {
+			__le32 ret;
+			if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
+					~EXT3_FEATURE_RO_COMPAT_SUPP))) {
+				printk(KERN_WARNING "EXT3-fs: %s: couldn't "
+				       "remount RDWR because of unsupported "
+				       "optional features (%x).\n",
+				       sb->s_id, le32_to_cpu(ret));
+				err = -EROFS;
+				goto restore_opts;
+			}
+			/*
+			 * Mounting a RDONLY partition read-write, so reread
+			 * and store the current valid flag.  (It may have
+			 * been changed by e2fsck since we originally mounted
+			 * the partition.)
+			 */
+			ext3_clear_journal_err(sb, es);
+			sbi->s_mount_state = le16_to_cpu(es->s_state);
+			if ((err = ext3_group_extend(sb, es, n_blocks_count)))
+				goto restore_opts;
+			if (!ext3_setup_super (sb, es, 0))
+				sb->s_flags &= ~MS_RDONLY;
+		}
+	}
+#ifdef CONFIG_QUOTA
+	/* Release old quota file names */
+	for (i = 0; i < MAXQUOTAS; i++)
+		if (old_opts.s_qf_names[i] &&
+		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
+			kfree(old_opts.s_qf_names[i]);
+#endif
+	return 0;
+restore_opts:
+	sb->s_flags = old_sb_flags;
+	sbi->s_mount_opt = old_opts.s_mount_opt;
+	sbi->s_resuid = old_opts.s_resuid;
+	sbi->s_resgid = old_opts.s_resgid;
+	sbi->s_commit_interval = old_opts.s_commit_interval;
+#ifdef CONFIG_QUOTA
+	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
+	for (i = 0; i < MAXQUOTAS; i++) {
+		if (sbi->s_qf_names[i] &&
+		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
+			kfree(sbi->s_qf_names[i]);
+		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
+	}
+#endif
+	return err;
+}
+
+static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct ext3_sb_info *sbi = EXT3_SB(sb);
+	struct ext3_super_block *es = sbi->s_es;
+	ext3_fsblk_t overhead;
+	int i;
+
+	if (test_opt (sb, MINIX_DF))
+		overhead = 0;
+	else {
+		unsigned long ngroups;
+		ngroups = EXT3_SB(sb)->s_groups_count;
+		smp_rmb();
+
+		/*
+		 * Compute the overhead (FS structures)
+		 */
+
+		/*
+		 * All of the blocks before first_data_block are
+		 * overhead
+		 */
+		overhead = le32_to_cpu(es->s_first_data_block);
+
+		/*
+		 * Add the overhead attributed to the superblock and
+		 * block group descriptors.  If the sparse superblocks
+		 * feature is turned on, then not all groups have this.
+		 */
+		for (i = 0; i < ngroups; i++) {
+			overhead += ext3_bg_has_super(sb, i) +
+				ext3_bg_num_gdb(sb, i);
+			cond_resched();
+		}
+
+		/*
+		 * Every block group has an inode bitmap, a block
+		 * bitmap, and an inode table.
+		 */
+		overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
+	}
+
+	buf->f_type = EXT3_SUPER_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
+	buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
+	buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
+	if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
+		buf->f_bavail = 0;
+	buf->f_files = le32_to_cpu(es->s_inodes_count);
+	buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
+	buf->f_namelen = EXT3_NAME_LEN;
+	return 0;
+}
+
+/* Helper function for writing quotas on sync - we need to start transaction before quota file
+ * is locked for write. Otherwise the are possible deadlocks:
+ * Process 1                         Process 2
+ * ext3_create()                     quota_sync()
+ *   journal_start()                   write_dquot()
+ *   DQUOT_INIT()                        down(dqio_mutex)
+ *     down(dqio_mutex)                    journal_start()
+ *
+ */
+
+#ifdef CONFIG_QUOTA
+
+static inline struct inode *dquot_to_inode(struct dquot *dquot)
+{
+	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
+}
+
+static int ext3_dquot_initialize(struct inode *inode, int type)
+{
+	handle_t *handle;
+	int ret, err;
+
+	/* We may create quota structure so we need to reserve enough blocks */
+	handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+	ret = dquot_initialize(inode, type);
+	err = ext3_journal_stop(handle);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+static int ext3_dquot_drop(struct inode *inode)
+{
+	handle_t *handle;
+	int ret, err;
+
+	/* We may delete quota structure so we need to reserve enough blocks */
+	handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+	ret = dquot_drop(inode);
+	err = ext3_journal_stop(handle);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+static int ext3_write_dquot(struct dquot *dquot)
+{
+	int ret, err;
+	handle_t *handle;
+	struct inode *inode;
+
+	inode = dquot_to_inode(dquot);
+	handle = ext3_journal_start(inode,
+					EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+	ret = dquot_commit(dquot);
+	err = ext3_journal_stop(handle);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+static int ext3_acquire_dquot(struct dquot *dquot)
+{
+	int ret, err;
+	handle_t *handle;
+
+	handle = ext3_journal_start(dquot_to_inode(dquot),
+					EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+	ret = dquot_acquire(dquot);
+	err = ext3_journal_stop(handle);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+static int ext3_release_dquot(struct dquot *dquot)
+{
+	int ret, err;
+	handle_t *handle;
+
+	handle = ext3_journal_start(dquot_to_inode(dquot),
+					EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+	ret = dquot_release(dquot);
+	err = ext3_journal_stop(handle);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+static int ext3_mark_dquot_dirty(struct dquot *dquot)
+{
+	/* Are we journalling quotas? */
+	if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
+	    EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
+		dquot_mark_dquot_dirty(dquot);
+		return ext3_write_dquot(dquot);
+	} else {
+		return dquot_mark_dquot_dirty(dquot);
+	}
+}
+
+static int ext3_write_info(struct super_block *sb, int type)
+{
+	int ret, err;
+	handle_t *handle;
+
+	/* Data block + inode block */
+	handle = ext3_journal_start(sb->s_root->d_inode, 2);
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+	ret = dquot_commit_info(sb, type);
+	err = ext3_journal_stop(handle);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+/*
+ * Turn on quotas during mount time - we need to find
+ * the quota file and such...
+ */
+static int ext3_quota_on_mount(struct super_block *sb, int type)
+{
+	return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
+			EXT3_SB(sb)->s_jquota_fmt, type);
+}
+
+/*
+ * Standard function to be called on quota_on
+ */
+static int ext3_quota_on(struct super_block *sb, int type, int format_id,
+			 char *path)
+{
+	int err;
+	struct nameidata nd;
+
+	if (!test_opt(sb, QUOTA))
+		return -EINVAL;
+	/* Not journalling quota? */
+	if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
+	    !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
+		return vfs_quota_on(sb, type, format_id, path);
+	err = path_lookup(path, LOOKUP_FOLLOW, &nd);
+	if (err)
+		return err;
+	/* Quotafile not on the same filesystem? */
+	if (nd.mnt->mnt_sb != sb) {
+		path_release(&nd);
+		return -EXDEV;
+	}
+	/* Quotafile not of fs root? */
+	if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
+		printk(KERN_WARNING
+			"EXT3-fs: Quota file not on filesystem root. "
+			"Journalled quota will not work.\n");
+	path_release(&nd);
+	return vfs_quota_on(sb, type, format_id, path);
+}
+
+/* Read data from quotafile - avoid pagecache and such because we cannot afford
+ * acquiring the locks... As quota files are never truncated and quota code
+ * itself serializes the operations (and noone else should touch the files)
+ * we don't have to be afraid of races */
+static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
+			       size_t len, loff_t off)
+{
+	struct inode *inode = sb_dqopt(sb)->files[type];
+	sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
+	int err = 0;
+	int offset = off & (sb->s_blocksize - 1);
+	int tocopy;
+	size_t toread;
+	struct buffer_head *bh;
+	loff_t i_size = i_size_read(inode);
+
+	if (off > i_size)
+		return 0;
+	if (off+len > i_size)
+		len = i_size-off;
+	toread = len;
+	while (toread > 0) {
+		tocopy = sb->s_blocksize - offset < toread ?
+				sb->s_blocksize - offset : toread;
+		bh = ext3_bread(NULL, inode, blk, 0, &err);
+		if (err)
+			return err;
+		if (!bh)	/* A hole? */
+			memset(data, 0, tocopy);
+		else
+			memcpy(data, bh->b_data+offset, tocopy);
+		brelse(bh);
+		offset = 0;
+		toread -= tocopy;
+		data += tocopy;
+		blk++;
+	}
+	return len;
+}
+
+/* Write to quotafile (we know the transaction is already started and has
+ * enough credits) */
+static ssize_t ext3_quota_write(struct super_block *sb, int type,
+				const char *data, size_t len, loff_t off)
+{
+	struct inode *inode = sb_dqopt(sb)->files[type];
+	sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
+	int err = 0;
+	int offset = off & (sb->s_blocksize - 1);
+	int tocopy;
+	int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
+	size_t towrite = len;
+	struct buffer_head *bh;
+	handle_t *handle = journal_current_handle();
+
+	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
+	while (towrite > 0) {
+		tocopy = sb->s_blocksize - offset < towrite ?
+				sb->s_blocksize - offset : towrite;
+		bh = ext3_bread(handle, inode, blk, 1, &err);
+		if (!bh)
+			goto out;
+		if (journal_quota) {
+			err = ext3_journal_get_write_access(handle, bh);
+			if (err) {
+				brelse(bh);
+				goto out;
+			}
+		}
+		lock_buffer(bh);
+		memcpy(bh->b_data+offset, data, tocopy);
+		flush_dcache_page(bh->b_page);
+		unlock_buffer(bh);
+		if (journal_quota)
+			err = ext3_journal_dirty_metadata(handle, bh);
+		else {
+			/* Always do at least ordered writes for quotas */
+			err = ext3_journal_dirty_data(handle, bh);
+			mark_buffer_dirty(bh);
+		}
+		brelse(bh);
+		if (err)
+			goto out;
+		offset = 0;
+		towrite -= tocopy;
+		data += tocopy;
+		blk++;
+	}
+out:
+	if (len == towrite)
+		return err;
+	if (inode->i_size < off+len-towrite) {
+		i_size_write(inode, off+len-towrite);
+		EXT3_I(inode)->i_disksize = inode->i_size;
+	}
+	inode->i_version++;
+	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	ext3_mark_inode_dirty(handle, inode);
+	mutex_unlock(&inode->i_mutex);
+	return len - towrite;
+}
+
+#endif
+
+static int ext3_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
+}
+
+static struct file_system_type ext3_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "ext3",
+	.get_sb		= ext3_get_sb,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+static int __init init_ext3_fs(void)
+{
+	int err = init_ext3_xattr();
+	if (err)
+		return err;
+	err = init_inodecache();
+	if (err)
+		goto out1;
+        err = register_filesystem(&ext3_fs_type);
+	if (err)
+		goto out;
+	return 0;
+out:
+	destroy_inodecache();
+out1:
+	exit_ext3_xattr();
+	return err;
+}
+
+static void __exit exit_ext3_fs(void)
+{
+	unregister_filesystem(&ext3_fs_type);
+	destroy_inodecache();
+	exit_ext3_xattr();
+}
+
+MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
+MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
+MODULE_LICENSE("GPL");
+module_init(init_ext3_fs)
+module_exit(exit_ext3_fs)