use static declear for init_pool

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
use ENOEXEC to replace EAGAIN

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
cls: init create_seq value

Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
cls: set directory counter when create inode

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