bufix: create_inode handle excl flag

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
cls: check ino when do link_inode

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
cls: check hctx exist for do link

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