[PATCH v2 1/3] io_uring: add helper for *REGISTER_SEND_MSG_RING

[Pavel Begunkov <asml.silence@gmail.com>]

Move handling of IORING_REGISTER_SEND_MSG_RING into a separate function
in preparation to growing io_uring_register_blind().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/register.c | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/io_uring/register.c b/io_uring/register.c
index a59589249fce..046dcb7ba4d1 100644
--- a/io_uring/register.c
+++ b/io_uring/register.c
@@ -877,6 +877,23 @@ struct file *io_uring_register_get_file(unsigned int fd, bool registered)
 	return ERR_PTR(-EOPNOTSUPP);
 }
 
+static int io_uring_register_send_msg_ring(void __user *arg, unsigned int nr_args)
+{
+	struct io_uring_sqe sqe;
+
+	if (!arg || nr_args != 1)
+		return -EINVAL;
+	if (copy_from_user(&sqe, arg, sizeof(sqe)))
+		return -EFAULT;
+	/* no flags supported */
+	if (sqe.flags)
+		return -EINVAL;
+	if (sqe.opcode != IORING_OP_MSG_RING)
+		return -EINVAL;
+
+	return io_uring_sync_msg_ring(&sqe);
+}
+
 /*
  * "blind" registration opcodes are ones where there's no ring given, and
  * hence the source fd must be -1.
@@ -885,21 +902,9 @@ static int io_uring_register_blind(unsigned int opcode, void __user *arg,
 				   unsigned int nr_args)
 {
 	switch (opcode) {
-	case IORING_REGISTER_SEND_MSG_RING: {
-		struct io_uring_sqe sqe;
-
-		if (!arg || nr_args != 1)
-			return -EINVAL;
-		if (copy_from_user(&sqe, arg, sizeof(sqe)))
-			return -EFAULT;
-		/* no flags supported */
-		if (sqe.flags)
-			return -EINVAL;
-		if (sqe.opcode == IORING_OP_MSG_RING)
-			return io_uring_sync_msg_ring(&sqe);
-		}
+	case IORING_REGISTER_SEND_MSG_RING:
+		return io_uring_register_send_msg_ring(arg, nr_args);
 	}
-
 	return -EINVAL;
 }
 
-- 
2.49.0