Commit 7fbb1b54 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring: don't open-code recv kbuf managment 



Don't implement fast path of kbuf freeing and management inlined into
io_recv{,msg}(), that's error prone and duplicates handling. Replace it
with a helper io_put_recv_kbuf(), which mimics io_put_rw_kbuf() in the
io_read/write().

This also keeps cflags calculation in one place, removing duplication
between rw and recv/send.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 8ff069bf

fs/io_uring.c

+14 −14
Original line number Diff line number Diff line
@@ -4098,7 +4098,7 @@ static int io_recvmsg_copy_hdr(struct io_kiocb *req, 
}



static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req,

					       int *cflags, bool needs_lock)

					       bool needs_lock)

{

	struct io_sr_msg *sr = &req->sr_msg;

	struct io_buffer *kbuf;
@@ -4109,12 +4109,14 @@ static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, 


	sr->kbuf = kbuf;

	req->flags |= REQ_F_BUFFER_SELECTED;



	*cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT;

	*cflags |= IORING_CQE_F_BUFFER;

	return kbuf;

}



static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req)

{

	return io_put_kbuf(req, req->sr_msg.kbuf);

}



static int io_recvmsg_prep(struct io_kiocb *req,

			   const struct io_uring_sqe *sqe)

{
@@ -4152,7 +4154,7 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, 
{

	struct io_async_msghdr iomsg, *kmsg;

	struct socket *sock;

	struct io_buffer *kbuf = NULL;

	struct io_buffer *kbuf;

	unsigned flags;

	int ret, cflags = 0;
@@ -4175,7 +4177,7 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, 
	}



	if (req->flags & REQ_F_BUFFER_SELECT) {

		kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock);

		kbuf = io_recv_buffer_select(req, !force_nonblock);

		if (IS_ERR(kbuf))

			return PTR_ERR(kbuf);

		kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
@@ -4196,12 +4198,11 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, 
	if (ret == -ERESTARTSYS)

		ret = -EINTR;



	if (kbuf)

		kfree(kbuf);

	if (req->flags & REQ_F_BUFFER_SELECTED)

		cflags = io_put_recv_kbuf(req);

	if (kmsg->iov != kmsg->fast_iov)

		kfree(kmsg->iov);

	req->flags &= ~(REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED);



	req->flags &= ~REQ_F_NEED_CLEANUP;

	if (ret < 0)

		req_set_fail_links(req);

	__io_req_complete(req, ret, cflags, cs);
@@ -4225,7 +4226,7 @@ static int io_recv(struct io_kiocb *req, bool force_nonblock, 
		return ret;



	if (req->flags & REQ_F_BUFFER_SELECT) {

		kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock);

		kbuf = io_recv_buffer_select(req, !force_nonblock);

		if (IS_ERR(kbuf))

			return PTR_ERR(kbuf);

		buf = u64_to_user_ptr(kbuf->addr);
@@ -4254,9 +4255,8 @@ static int io_recv(struct io_kiocb *req, bool force_nonblock, 
	if (ret == -ERESTARTSYS)

		ret = -EINTR;

out_free:

	if (kbuf)

		kfree(kbuf);

	req->flags &= ~REQ_F_NEED_CLEANUP;

	if (req->flags & REQ_F_BUFFER_SELECTED)

		cflags = io_put_recv_kbuf(req);

	if (ret < 0)

		req_set_fail_links(req);

	__io_req_complete(req, ret, cflags, cs);

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