If a CIFS user attempts to access a file or directory on the OceanStor 9000, the
OceanStor 9000 authenticates local or AD domain users in the first place. If the UNIX
permission (UNIX Mode bits, POSIX ACL, or NFSv4 ACL) has been configured the file
or directory to be accessed, the CIFS user is mapped as an NFS user based on preset user
mapping rules during authentication. Then the OceanStor 9000 implements UNIX
permission authentication for the user