acl_by_type
__forget_cached_acl(acl_by_type(inode, type));
p = acl_by_type(inode, type);
struct posix_acl **p = acl_by_type(inode, type);
struct posix_acl *acl = rcu_dereference(*acl_by_type(inode, type));
struct posix_acl **p = acl_by_type(inode, type);