dump.f2fs: add -I nid to dump inode by scan full disk

Usage:
	dump.f2fs -I [inode nid] /dev/sda

This feature can be useful for some bugs caused by system crash.
We not only need dump current valid node page, but alse the history
data in disk, which can give some clues for status change of the inode.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
[Jaegeuk Kim: fix build error]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
4 files changed