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SUNRPC: Fix socket waits for write buffer space

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[ Upstream commit 7496b59f58 ]

The socket layer requires that we use the socket lock to protect changes
to the sock->sk_write_pending field and others.

Reported-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2022-03-14 21:02:10 -04:00 committed by Greg Kroah-Hartman
parent b9c5ac0a15
commit 7a506fabcf
1 changed files with 42 additions and 18 deletions
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60
net/sunrpc/xprtsock.c
View file

@ -754,12 +754,12 @@ xs_stream_start_connect(struct sock_xprt *transport)
/**
* xs_nospace - handle transmit was incomplete
* @req: pointer to RPC request
* @transport: pointer to struct sock_xprt
*
*/
static int xs_nospace(struct rpc_rqst *req)
static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
{
struct rpc_xprt *xprt = req->rq_xprt;
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
struct rpc_xprt *xprt = &transport->xprt;
struct sock *sk = transport->inet;
int ret = -EAGAIN;
@ -770,16 +770,6 @@ static int xs_nospace(struct rpc_rqst *req)
/* Don't race with disconnect */
if (xprt_connected(xprt)) {
/* wait for more buffer space */
sk->sk_write_pending++;
xprt_wait_for_buffer_space(xprt);
} else
ret = -ENOTCONN;
spin_unlock(&xprt->transport_lock);
/* Race breaker in case memory is freed before above code is called */
if (ret == -EAGAIN) {
struct socket_wq *wq;
rcu_read_lock();
@ -787,8 +777,42 @@ static int xs_nospace(struct rpc_rqst *req)
set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
rcu_read_unlock();
sk->sk_write_space(sk);
}
/* wait for more buffer space */
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
sk->sk_write_pending++;
xprt_wait_for_buffer_space(xprt);
} else
ret = -ENOTCONN;
spin_unlock(&xprt->transport_lock);
return ret;
}
static int xs_sock_nospace(struct rpc_rqst *req)
{
struct sock_xprt *transport =
container_of(req->rq_xprt, struct sock_xprt, xprt);
struct sock *sk = transport->inet;
int ret = -EAGAIN;
lock_sock(sk);
if (!sock_writeable(sk))
ret = xs_nospace(req, transport);
release_sock(sk);
return ret;
}
static int xs_stream_nospace(struct rpc_rqst *req)
{
struct sock_xprt *transport =
container_of(req->rq_xprt, struct sock_xprt, xprt);
struct sock *sk = transport->inet;
int ret = -EAGAIN;
lock_sock(sk);
if (!sk_stream_memory_free(sk))
ret = xs_nospace(req, transport);
release_sock(sk);
return ret;
}
@ -878,7 +902,7 @@ static int xs_local_send_request(struct rpc_rqst *req)
case -ENOBUFS:
break;
case -EAGAIN:
status = xs_nospace(req);
status = xs_stream_nospace(req);
break;
default:
dprintk("RPC: sendmsg returned unrecognized error %d\n",
@ -954,7 +978,7 @@ static int xs_udp_send_request(struct rpc_rqst *req)
/* Should we call xs_close() here? */
break;
case -EAGAIN:
status = xs_nospace(req);
status = xs_sock_nospace(req);
break;
case -ENETUNREACH:
case -ENOBUFS:
@ -1069,7 +1093,7 @@ static int xs_tcp_send_request(struct rpc_rqst *req)
/* Should we call xs_close() here? */
break;
case -EAGAIN:
status = xs_nospace(req);
status = xs_stream_nospace(req);
break;
case -ECONNRESET:
case -ECONNREFUSED: