ceph_check_fsid
if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
EXPORT_SYMBOL(ceph_check_fsid);
if (ceph_check_fsid(client, &monmap->fsid) < 0) {
if (ceph_check_fsid(osdc->client, &fsid) < 0)