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SUNRPC: Remove the bh-safe lock requirement on xprt->transport_lock 

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-05-02 11:21:08 -04:00
parent 4f8943f808
commit b5e924191f
5 changed files with 47 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
net/sunrpc/xprt.c
View File

@ -302,9 +302,9 @@ static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
if (test_bit(XPRT_LOCKED, &xprt->state) && xprt->snd_task == task)
return 1;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
retval = xprt->ops->reserve_xprt(xprt, task);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
return retval;
}
@ -381,9 +381,9 @@ static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *ta
{
if (xprt->snd_task != task)
return;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt->ops->release_xprt(xprt, task);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
/*
@ -435,9 +435,9 @@ xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req)
if (req->rq_cong)
return true;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
ret = __xprt_get_cong(xprt, req) != 0;
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
return ret;
}
EXPORT_SYMBOL_GPL(xprt_request_get_cong);
@ -464,9 +464,9 @@ static void
xprt_clear_congestion_window_wait(struct rpc_xprt *xprt)
{
if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) {
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
__xprt_lock_write_next_cong(xprt);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
}
@ -563,9 +563,9 @@ bool xprt_write_space(struct rpc_xprt *xprt)
if (!test_bit(XPRT_WRITE_SPACE, &xprt->state))
return false;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
ret = xprt_clear_write_space_locked(xprt);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
return ret;
}
EXPORT_SYMBOL_GPL(xprt_write_space);
@ -634,9 +634,9 @@ int xprt_adjust_timeout(struct rpc_rqst *req)
req->rq_retries = 0;
xprt_reset_majortimeo(req);
/* Reset the RTT counters == "slow start" */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
status = -ETIMEDOUT;
}
@ -668,11 +668,11 @@ static void xprt_autoclose(struct work_struct *work)
void xprt_disconnect_done(struct rpc_xprt *xprt)
{
dprintk("RPC: disconnected transport %p\n", xprt);
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt_clear_connected(xprt);
xprt_clear_write_space_locked(xprt);
xprt_wake_pending_tasks(xprt, -ENOTCONN);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
EXPORT_SYMBOL_GPL(xprt_disconnect_done);
@ -684,7 +684,7 @@ EXPORT_SYMBOL_GPL(xprt_disconnect_done);
void xprt_force_disconnect(struct rpc_xprt *xprt)
{
/* Don't race with the test_bit() in xprt_clear_locked() */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
set_bit(XPRT_CLOSE_WAIT, &xprt->state);
/* Try to schedule an autoclose RPC call */
if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
@ -692,7 +692,7 @@ void xprt_force_disconnect(struct rpc_xprt *xprt)
else if (xprt->snd_task)
rpc_wake_up_queued_task_set_status(&xprt->pending,
xprt->snd_task, -ENOTCONN);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
EXPORT_SYMBOL_GPL(xprt_force_disconnect);
@ -726,7 +726,7 @@ xprt_request_retransmit_after_disconnect(struct rpc_task *task)
void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie)
{
/* Don't race with the test_bit() in xprt_clear_locked() */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
if (cookie != xprt->connect_cookie)
goto out;
if (test_bit(XPRT_CLOSING, &xprt->state))
@ -737,7 +737,7 @@ void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie)
queue_work(xprtiod_workqueue, &xprt->task_cleanup);
xprt_wake_pending_tasks(xprt, -EAGAIN);
out:
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
static bool
@ -759,18 +759,13 @@ xprt_init_autodisconnect(struct timer_list *t)
{
struct rpc_xprt *xprt = from_timer(xprt, t, timer);
spin_lock(&xprt->transport_lock);
if (!RB_EMPTY_ROOT(&xprt->recv_queue))
goto out_abort;
return;
/* Reset xprt->last_used to avoid connect/autodisconnect cycling */
xprt->last_used = jiffies;
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
goto out_abort;
spin_unlock(&xprt->transport_lock);
queue_work(xprtiod_workqueue, &xprt->task_cleanup);
return;
out_abort:
spin_unlock(&xprt->transport_lock);
queue_work(xprtiod_workqueue, &xprt->task_cleanup);
}
bool xprt_lock_connect(struct rpc_xprt *xprt,
@ -779,7 +774,7 @@ bool xprt_lock_connect(struct rpc_xprt *xprt,
{
bool ret = false;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
if (!test_bit(XPRT_LOCKED, &xprt->state))
goto out;
if (xprt->snd_task != task)
@ -787,13 +782,13 @@ bool xprt_lock_connect(struct rpc_xprt *xprt,
xprt->snd_task = cookie;
ret = true;
out:
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
return ret;
}
void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie)
{
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
if (xprt->snd_task != cookie)
goto out;
if (!test_bit(XPRT_LOCKED, &xprt->state))
@ -802,7 +797,7 @@ void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie)
xprt->ops->release_xprt(xprt, NULL);
xprt_schedule_autodisconnect(xprt);
out:
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
wake_up_bit(&xprt->state, XPRT_LOCKED);
}
@ -1412,14 +1407,14 @@ xprt_request_transmit(struct rpc_rqst *req, struct rpc_task *snd_task)
xprt_inject_disconnect(xprt);
task->tk_flags |= RPC_TASK_SENT;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt->stat.sends++;
xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
xprt->stat.bklog_u += xprt->backlog.qlen;
xprt->stat.sending_u += xprt->sending.qlen;
xprt->stat.pending_u += xprt->pending.qlen;
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
req->rq_connect_cookie = connect_cookie;
out_dequeue:
@ -1770,13 +1765,13 @@ void xprt_release(struct rpc_task *task)
else if (task->tk_client)
rpc_count_iostats(task, task->tk_client->cl_metrics);
xprt_request_dequeue_all(task, req);
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt->ops->release_xprt(xprt, task);
if (xprt->ops->release_request)
xprt->ops->release_request(task);
xprt->last_used = jiffies;
xprt_schedule_autodisconnect(xprt);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
if (req->rq_buffer)
xprt->ops->buf_free(task);
xprt_inject_disconnect(xprt);

4
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -1360,10 +1360,10 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
else if (credits > buf->rb_max_requests)
credits = buf->rb_max_requests;
if (buf->rb_credits != credits) {
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
buf->rb_credits = credits;
xprt->cwnd = credits << RPC_CWNDSHIFT;
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
req = rpcr_to_rdmar(rqst);

4
net/sunrpc/xprtrdma/svc_rdma_backchannel.c
View File

@ -72,9 +72,9 @@ int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, __be32 *rdma_resp,
else if (credits > r_xprt->rx_buf.rb_bc_max_requests)
credits = r_xprt->rx_buf.rb_bc_max_requests;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt->cwnd = credits << RPC_CWNDSHIFT;
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
spin_lock(&xprt->queue_lock);
ret = 0;

8
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -226,9 +226,9 @@ static void handle_connect_req(struct rdma_cm_id *new_cma_id,
* Enqueue the new transport on the accept queue of the listening
* transport
*/
spin_lock_bh(&listen_xprt->sc_lock);
spin_lock(&listen_xprt->sc_lock);
list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
spin_unlock_bh(&listen_xprt->sc_lock);
spin_unlock(&listen_xprt->sc_lock);
set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
svc_xprt_enqueue(&listen_xprt->sc_xprt);
@ -401,7 +401,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
clear_bit(XPT_CONN, &xprt->xpt_flags);
/* Get the next entry off the accept list */
spin_lock_bh(&listen_rdma->sc_lock);
spin_lock(&listen_rdma->sc_lock);
if (!list_empty(&listen_rdma->sc_accept_q)) {
newxprt = list_entry(listen_rdma->sc_accept_q.next,
struct svcxprt_rdma, sc_accept_q);
@ -409,7 +409,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
}
if (!list_empty(&listen_rdma->sc_accept_q))
set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
spin_unlock_bh(&listen_rdma->sc_lock);
spin_unlock(&listen_rdma->sc_lock);
if (!newxprt)
return NULL;

23
net/sunrpc/xprtsock.c
View File

@ -880,7 +880,7 @@ static int xs_nospace(struct rpc_rqst *req)
req->rq_slen);
/* Protect against races with write_space */
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
/* Don't race with disconnect */
if (xprt_connected(xprt)) {
@ -890,7 +890,7 @@ static int xs_nospace(struct rpc_rqst *req)
} else
ret = -ENOTCONN;
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
/* Race breaker in case memory is freed before above code is called */
if (ret == -EAGAIN) {
@ -1344,6 +1344,7 @@ static void xs_destroy(struct rpc_xprt *xprt)
cancel_delayed_work_sync(&transport->connect_worker);
xs_close(xprt);
cancel_work_sync(&transport->recv_worker);
cancel_work_sync(&transport->error_worker);
xs_xprt_free(xprt);
module_put(THIS_MODULE);
}
@ -1397,9 +1398,9 @@ static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
}
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt_adjust_cwnd(xprt, task, copied);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
spin_lock(&xprt->queue_lock);
xprt_complete_rqst(task, copied);
__UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
@ -1509,7 +1510,6 @@ static void xs_tcp_state_change(struct sock *sk)
trace_rpc_socket_state_change(xprt, sk->sk_socket);
switch (sk->sk_state) {
case TCP_ESTABLISHED:
spin_lock(&xprt->transport_lock);
if (!xprt_test_and_set_connected(xprt)) {
xprt->connect_cookie++;
clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
@ -1520,7 +1520,6 @@ static void xs_tcp_state_change(struct sock *sk)
xprt->stat.connect_start;
xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
}
spin_unlock(&xprt->transport_lock);
break;
case TCP_FIN_WAIT1:
/* The client initiated a shutdown of the socket */
@ -1677,9 +1676,9 @@ static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t
*/
static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
{
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
static int xs_get_random_port(void)
@ -2214,13 +2213,13 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
unsigned int opt_on = 1;
unsigned int timeo;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
keepcnt = xprt->timeout->to_retries + 1;
timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
(xprt->timeout->to_retries + 1);
clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
/* TCP Keepalive options */
kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
@ -2245,7 +2244,7 @@ static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
struct rpc_timeout to;
unsigned long initval;
spin_lock_bh(&xprt->transport_lock);
spin_lock(&xprt->transport_lock);
if (reconnect_timeout < xprt->max_reconnect_timeout)
xprt->max_reconnect_timeout = reconnect_timeout;
if (connect_timeout < xprt->connect_timeout) {
@ -2262,7 +2261,7 @@ static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
xprt->connect_timeout = connect_timeout;
}
set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
spin_unlock_bh(&xprt->transport_lock);
spin_unlock(&xprt->transport_lock);
}
static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)