[RFC PATCH v4 1/3] io_uring: Rename `io_{send,recv}` to `io_{sendto,recvfrom}`

[Ammar Faizi <ammarfaizi2@gnuweeb.org>]

Currently we can perform `send` and `recv` via io_uring. And now, we
are going to add `sendto` and `recvfrom` support for io_uring.

Note that:
Calling `send(fd, buf, len, flags)` is equivalent to calling
`sendto(fd, buf, len, flags, NULL, 0)`. Therefore, `sendto`
is a superset of `send`.

Calling `recv(fd, buf, len, flags)` is equivalent to calling
`recvfrom(fd, buf, len, flags, NULL, NULL)`. Therefore, `recvfrom`
is a superset of `recv`.

As such, let's direct the current supported `IORING_OP_{SEND,RECV}` to
`io_{sendto,recvfrom}`. These functions will also be used for
`IORING_OP_{SENDTO,RECVFROM}` operation in the next patches.

Cc: Nugra <richiisei@gmail.com>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---

v4:
  - Rebase the work (sync with "for-next" branch in Jens' tree).

v3:
  - Fix build error when CONFIG_NET is undefined for PATCH 1/3. I
    tried to fix it in PATCH 3/3, but it should be fixed in PATCH 1/3,
    otherwise it breaks the build in PATCH 1/3.

v2:
  - Added Nugra to CC list (tester).

---
---
 fs/io_uring.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index d5da4a898fe8..5e45e4d6969c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4947,7 +4947,7 @@ static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 	return 0;
 }
 
-static int io_send(struct io_kiocb *req, unsigned int issue_flags)
+static int io_sendto(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_sr_msg *sr = &req->sr_msg;
 	struct msghdr msg;
@@ -5173,7 +5173,7 @@ static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 	return 0;
 }
 
-static int io_recv(struct io_kiocb *req, unsigned int issue_flags)
+static int io_recvfrom(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_buffer *kbuf;
 	struct io_sr_msg *sr = &req->sr_msg;
@@ -5381,8 +5381,8 @@ IO_NETOP_PREP_ASYNC(sendmsg);
 IO_NETOP_PREP_ASYNC(recvmsg);
 IO_NETOP_PREP_ASYNC(connect);
 IO_NETOP_PREP(accept);
-IO_NETOP_FN(send);
-IO_NETOP_FN(recv);
+IO_NETOP_FN(sendto);
+IO_NETOP_FN(recvfrom);
 #endif /* CONFIG_NET */
 
 struct io_poll_table {
@@ -6710,13 +6710,13 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
 		ret = io_sendmsg(req, issue_flags);
 		break;
 	case IORING_OP_SEND:
-		ret = io_send(req, issue_flags);
+		ret = io_sendto(req, issue_flags);
 		break;
 	case IORING_OP_RECVMSG:
 		ret = io_recvmsg(req, issue_flags);
 		break;
 	case IORING_OP_RECV:
-		ret = io_recv(req, issue_flags);
+		ret = io_recvfrom(req, issue_flags);
 		break;
 	case IORING_OP_TIMEOUT:
 		ret = io_timeout(req, issue_flags);
-- 
2.32.0