ublksrv_tgt: add helper of ublk_get_sqe_pair()
Prepare for supporting zero copy by fused command.
Signed-off-by: Ming Lei <[email protected]>
diff --git a/include/ublksrv_tgt.h b/include/ublksrv_tgt.h
index 9bd5ac3..00af8a5 100644
--- a/include/ublksrv_tgt.h
+++ b/include/ublksrv_tgt.h
@@ -176,4 +176,16 @@
int ublk_json_write_target_base(struct ublksrv_dev *dev, char **jbuf, int *len,
const struct ublksrv_tgt_base_json *tgt);
+static inline void ublk_get_sqe_pair(struct io_uring *r,
+ struct io_uring_sqe **sqe, struct io_uring_sqe **sqe2)
+{
+ unsigned left = io_uring_sq_space_left(r);
+
+ if (left < 2)
+ io_uring_submit(r);
+ *sqe = io_uring_get_sqe(r);
+ if (sqe2)
+ *sqe2 = io_uring_get_sqe(r);
+}
+
#endif
