ublk: add helper of ublk_need_map_io()

ublk_need_map_io() is more readable.

Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250327095123.179113-5-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/ublk_drv.c

@@ -596,6 +596,11 @@ static inline bool ublk_support_user_copy(const struct ublk_queue *ubq)
 	return ubq->flags & (UBLK_F_USER_COPY | UBLK_F_SUPPORT_ZERO_COPY);
 }
 
+static inline bool ublk_need_map_io(const struct ublk_queue *ubq)
+{
+	return !ublk_support_user_copy(ubq);
+}
+
 static inline bool ublk_need_req_ref(const struct ublk_queue *ubq)
 {
 	/*
@@ -923,7 +928,7 @@ static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
 {
 	const unsigned int rq_bytes = blk_rq_bytes(req);
 
-	if (ublk_support_user_copy(ubq))
+	if (!ublk_need_map_io(ubq))
 		return rq_bytes;
 
 	/*
@@ -947,7 +952,7 @@ static int ublk_unmap_io(const struct ublk_queue *ubq,
 {
 	const unsigned int rq_bytes = blk_rq_bytes(req);
 
-	if (ublk_support_user_copy(ubq))
+	if (!ublk_need_map_io(ubq))
 		return rq_bytes;
 
 	if (ublk_need_unmap_req(req)) {
@@ -1867,7 +1872,7 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 		if (io->flags & UBLK_IO_FLAG_OWNED_BY_SRV)
 			goto out;
 
-		if (!ublk_support_user_copy(ubq)) {
+		if (ublk_need_map_io(ubq)) {
 			/*
 			 * FETCH_RQ has to provide IO buffer if NEED GET
 			 * DATA is not enabled
@@ -1889,7 +1894,7 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 		if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV))
 			goto out;
 
-		if (!ublk_support_user_copy(ubq)) {
+		if (ublk_need_map_io(ubq)) {
 			/*
 			 * COMMIT_AND_FETCH_REQ has to provide IO buffer if
 			 * NEED GET DATA is not enabled or it is Read IO.