HAMMER2IOC_PFS_SNAPSHOT
if (ioctl(fd, HAMMER2IOC_PFS_SNAPSHOT, &pfs) < 0) {
case HAMMER2IOC_PFS_SNAPSHOT:
case HAMMER2IOC_PFS_SNAPSHOT:
h2_opt->ioctl_cmd = HAMMER2IOC_PFS_SNAPSHOT;
case HAMMER2IOC_PFS_SNAPSHOT: