CEPH_MOUNT_OPT_DCACHE
fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
(CEPH_MOUNT_OPT_DCACHE | \