linux-kernel - [PATCH 6.0 012/862] io_uring/net: dont lose partial send/recv on fail

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Date:   Wed, 19 Oct 2022 10:21:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 6.0 012/862] io_uring/net: dont lose partial send/recv on fail

From: Pavel Begunkov <asml.silence@...il.com>

commit 7e6b638ed501cced4e472298d6b08dd16346f3a6 upstream.

Just as with rw, partial send/recv may end up in
io_req_complete_failed() and loose the result, make sure we return the
number of bytes processed.

Cc: stable@...r.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/a4ff95897b5419356fca9ea55db91ac15b2975f9.1663668091.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 io_uring/net.c   |   10 ++++++++++
 io_uring/net.h   |    2 ++
 io_uring/opdef.c |    4 ++++
 3 files changed, 16 insertions(+)

--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1087,6 +1087,16 @@ int io_sendzc(struct io_kiocb *req, unsi
 	return IOU_OK;
 }
 
+void io_sendrecv_fail(struct io_kiocb *req)
+{
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+	int res = req->cqe.res;
+
+	if (req->flags & REQ_F_PARTIAL_IO)
+		res = sr->done_io;
+	io_req_set_res(req, res, req->cqe.flags);
+}
+
 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
--- a/io_uring/net.h
+++ b/io_uring/net.h
@@ -43,6 +43,8 @@ int io_recvmsg_prep(struct io_kiocb *req
 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags);
 int io_recv(struct io_kiocb *req, unsigned int issue_flags);
 
+void io_sendrecv_fail(struct io_kiocb *req);
+
 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
 int io_accept(struct io_kiocb *req, unsigned int issue_flags);
 
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -157,6 +157,7 @@ const struct io_op_def io_op_defs[] = {
 		.issue			= io_sendmsg,
 		.prep_async		= io_sendmsg_prep_async,
 		.cleanup		= io_sendmsg_recvmsg_cleanup,
+		.fail			= io_sendrecv_fail,
 #else
 		.prep			= io_eopnotsupp_prep,
 #endif
@@ -174,6 +175,7 @@ const struct io_op_def io_op_defs[] = {
 		.issue			= io_recvmsg,
 		.prep_async		= io_recvmsg_prep_async,
 		.cleanup		= io_sendmsg_recvmsg_cleanup,
+		.fail			= io_sendrecv_fail,
 #else
 		.prep			= io_eopnotsupp_prep,
 #endif
@@ -316,6 +318,7 @@ const struct io_op_def io_op_defs[] = {
 #if defined(CONFIG_NET)
 		.prep			= io_sendmsg_prep,
 		.issue			= io_send,
+		.fail			= io_sendrecv_fail,
 #else
 		.prep			= io_eopnotsupp_prep,
 #endif
@@ -331,6 +334,7 @@ const struct io_op_def io_op_defs[] = {
 #if defined(CONFIG_NET)
 		.prep			= io_recvmsg_prep,
 		.issue			= io_recv,
+		.fail			= io_sendrecv_fail,
 #else
 		.prep			= io_eopnotsupp_prep,
 #endif