Instead of
	mark_inode_dirty(inode);
	if (IS_SYNC(inode))
		fat_sync_inode(inode);

use this
	if (IS_SYNC(inode))
		fat_sync_inode(inode);
	else
		mark_inode_dirty(inode);

And if occurs a error, restore the ->i_start and ->i_logstart.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>-
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>