root inodeno is 0

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
nothing

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
cls: add find_inode & list_inode

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>