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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: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-07-16 23:28:05 +03:00 committed by Jens Axboe
parent 8ff069bf2e
commit 7fbb1b541f
1 changed files with 14 additions and 14 deletions
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28
fs/io_uring.c
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@ -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);