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Diffstat (limited to 'net/sunrpc/xprt.c')
-rw-r--r--net/sunrpc/xprt.c60
1 files changed, 46 insertions, 14 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 06ca058..f412a85 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -12,8 +12,9 @@
* - Next, the caller puts together the RPC message, stuffs it into
* the request struct, and calls xprt_transmit().
* - xprt_transmit sends the message and installs the caller on the
- * transport's wait list. At the same time, it installs a timer that
- * is run after the packet's timeout has expired.
+ * transport's wait list. At the same time, if a reply is expected,
+ * it installs a timer that is run after the packet's timeout has
+ * expired.
* - When a packet arrives, the data_ready handler walks the list of
* pending requests for that transport. If a matching XID is found, the
* caller is woken up, and the timer removed.
@@ -46,6 +47,8 @@
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/metrics.h>
+#include "sunrpc.h"
+
/*
* Local variables
*/
@@ -192,8 +195,8 @@ EXPORT_SYMBOL_GPL(xprt_load_transport);
*/
int xprt_reserve_xprt(struct rpc_task *task)
{
- struct rpc_xprt *xprt = task->tk_xprt;
struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
if (task == xprt->snd_task)
@@ -803,9 +806,10 @@ void xprt_complete_rqst(struct rpc_task *task, int copied)
list_del_init(&req->rq_list);
req->rq_private_buf.len = copied;
- /* Ensure all writes are done before we update req->rq_received */
+ /* Ensure all writes are done before we update */
+ /* req->rq_reply_bytes_recvd */
smp_wmb();
- req->rq_received = copied;
+ req->rq_reply_bytes_recvd = copied;
rpc_wake_up_queued_task(&xprt->pending, task);
}
EXPORT_SYMBOL_GPL(xprt_complete_rqst);
@@ -820,7 +824,7 @@ static void xprt_timer(struct rpc_task *task)
dprintk("RPC: %5u xprt_timer\n", task->tk_pid);
spin_lock_bh(&xprt->transport_lock);
- if (!req->rq_received) {
+ if (!req->rq_reply_bytes_recvd) {
if (xprt->ops->timer)
xprt->ops->timer(task);
} else
@@ -842,8 +846,8 @@ int xprt_prepare_transmit(struct rpc_task *task)
dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid);
spin_lock_bh(&xprt->transport_lock);
- if (req->rq_received && !req->rq_bytes_sent) {
- err = req->rq_received;
+ if (req->rq_reply_bytes_recvd && !req->rq_bytes_sent) {
+ err = req->rq_reply_bytes_recvd;
goto out_unlock;
}
if (!xprt->ops->reserve_xprt(task))
@@ -855,7 +859,7 @@ out_unlock:
void xprt_end_transmit(struct rpc_task *task)
{
- xprt_release_write(task->tk_xprt, task);
+ xprt_release_write(task->tk_rqstp->rq_xprt, task);
}
/**
@@ -872,8 +876,11 @@ void xprt_transmit(struct rpc_task *task)
dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
- if (!req->rq_received) {
- if (list_empty(&req->rq_list)) {
+ if (!req->rq_reply_bytes_recvd) {
+ if (list_empty(&req->rq_list) && rpc_reply_expected(task)) {
+ /*
+ * Add to the list only if we're expecting a reply
+ */
spin_lock_bh(&xprt->transport_lock);
/* Update the softirq receive buffer */
memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
@@ -908,8 +915,13 @@ void xprt_transmit(struct rpc_task *task)
/* Don't race with disconnect */
if (!xprt_connected(xprt))
task->tk_status = -ENOTCONN;
- else if (!req->rq_received)
+ else if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) {
+ /*
+ * Sleep on the pending queue since
+ * we're expecting a reply.
+ */
rpc_sleep_on(&xprt->pending, task, xprt_timer);
+ }
spin_unlock_bh(&xprt->transport_lock);
}
@@ -982,11 +994,17 @@ static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
*/
void xprt_release(struct rpc_task *task)
{
- struct rpc_xprt *xprt = task->tk_xprt;
+ struct rpc_xprt *xprt;
struct rpc_rqst *req;
+ int is_bc_request;
if (!(req = task->tk_rqstp))
return;
+
+ /* Preallocated backchannel request? */
+ is_bc_request = bc_prealloc(req);
+
+ xprt = req->rq_xprt;
rpc_count_iostats(task);
spin_lock_bh(&xprt->transport_lock);
xprt->ops->release_xprt(xprt, task);
@@ -999,10 +1017,19 @@ void xprt_release(struct rpc_task *task)
mod_timer(&xprt->timer,
xprt->last_used + xprt->idle_timeout);
spin_unlock_bh(&xprt->transport_lock);
- xprt->ops->buf_free(req->rq_buffer);
+ if (!bc_prealloc(req))
+ xprt->ops->buf_free(req->rq_buffer);
task->tk_rqstp = NULL;
if (req->rq_release_snd_buf)
req->rq_release_snd_buf(req);
+
+ /*
+ * Early exit if this is a backchannel preallocated request.
+ * There is no need to have it added to the RPC slot list.
+ */
+ if (is_bc_request)
+ return;
+
memset(req, 0, sizeof(*req)); /* mark unused */
dprintk("RPC: %5u release request %p\n", task->tk_pid, req);
@@ -1049,6 +1076,11 @@ found:
INIT_LIST_HEAD(&xprt->free);
INIT_LIST_HEAD(&xprt->recv);
+#if defined(CONFIG_NFS_V4_1)
+ spin_lock_init(&xprt->bc_pa_lock);
+ INIT_LIST_HEAD(&xprt->bc_pa_list);
+#endif /* CONFIG_NFS_V4_1 */
+
INIT_WORK(&xprt->task_cleanup, xprt_autoclose);
setup_timer(&xprt->timer, xprt_init_autodisconnect,
(unsigned long)xprt);