GUD_COMPRESSION_LZ4
if (gdrm->compression & GUD_COMPRESSION_LZ4)
gdrm->compression = desc.compression & GUD_COMPRESSION_LZ4;
if (gdrm->compression & GUD_COMPRESSION_LZ4) {
if (compression & GUD_COMPRESSION_LZ4) {
req->compression = GUD_COMPRESSION_LZ4;