Use "struct fat_slot_info" for fat_scan().  But ".." entry can not provide
valid informations for inode, so add the fat_get_dotdot_entry() as special
case.
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>