UBLK_SHMEM_BUF_READ_ONLY
if (buf_reg.flags & ~UBLK_SHMEM_BUF_READ_ONLY)
if (!(buf_reg.flags & UBLK_SHMEM_BUF_READ_ONLY))
if ((range->flags & UBLK_SHMEM_BUF_READ_ONLY) &&
ctx->rdonly_shmem_buf ? UBLK_SHMEM_BUF_READ_ONLY : 0);