[LU-9951] check whether posix_acl_update_mode exists

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.2
• Labels: patch
• Severity: 3
• Assignee: Gu Zheng (Inactive)
• Reporter: Gu Zheng (Inactive)

Description

posix_acl_update_mode is introduced in kernel 4.9, add the check
of it, if not, use posix_acl_equiv_mode instead.