UBLK_IO_F_SHMEM_ZC
return ublk_get_iod(ubq, tag)->op_flags & UBLK_IO_F_SHMEM_ZC;
iod->op_flags |= UBLK_IO_F_SHMEM_ZC;
if (iod->op_flags & UBLK_IO_F_SHMEM_ZC)