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authorTrond Myklebust <Trond.Myklebust@netapp.com>2009-03-11 18:37:57 (GMT)
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-03-11 18:37:57 (GMT)
commit15f081ca8ddfe150fb639c591b18944a539da0fc (patch)
tree24261e97034770ab827d153cc541222e04701ac3 /net/sunrpc
parenta67d18f89f5782806135aad4ee012ff78d45aae7 (diff)
downloadlinux-15f081ca8ddfe150fb639c591b18944a539da0fc.tar.xz
SUNRPC: Avoid an unnecessary task reschedule on ENOTCONN
If the socket is unconnected, and xprt_transmit() returns ENOTCONN, we currently give up the lock on the transport channel. Doing so means that the lock automatically gets assigned to the next task in the xprt->sending queue, and so that task needs to be woken up to do the actual connect. The following patch aims to avoid that unnecessary task switch. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/clnt.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 836f15c..07e9b05 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1105,14 +1105,24 @@ static void
call_transmit_status(struct rpc_task *task)
{
task->tk_action = call_status;
- /*
- * Special case: if we've been waiting on the socket's write_space()
- * callback, then don't call xprt_end_transmit().
- */
- if (task->tk_status == -EAGAIN)
- return;
- xprt_end_transmit(task);
- rpc_task_force_reencode(task);
+ switch (task->tk_status) {
+ case -EAGAIN:
+ break;
+ default:
+ xprt_end_transmit(task);
+ /*
+ * Special cases: if we've been waiting on the
+ * socket's write_space() callback, or if the
+ * socket just returned a connection error,
+ * then hold onto the transport lock.
+ */
+ case -ECONNREFUSED:
+ case -ENOTCONN:
+ case -EHOSTDOWN:
+ case -EHOSTUNREACH:
+ case -ENETUNREACH:
+ rpc_task_force_reencode(task);
+ }
}
/*