Drivers: hv: kvp,vss: Fast propagation of userspace communication failure
If we fail to send a message to userspace daemon with cn_netlink_send()
there is no need to wait for userspace to reply as it is not going to
happen. This happens when kvp or vss daemon is stopped after a successful
handshake. Report HV_E_FAIL immediately and cancel the timeout job so
host won't receive two failures.
Use pr_warn() for VSS and pr_debug() for KVP deliberately as VSS request
are rare and result in a failed backup. KVP requests are much more frequent
after a successful handshake so avoid flooding logs. It would be nice to
have an ability to de-negotiate with the host in case userspace daemon gets
disconnected so we won't receive new requests. But I'm not sure it is
possible.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 21e51be..9d5e0d1 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -96,6 +96,7 @@
static void vss_send_op(struct work_struct *dummy)
{
int op = vss_transaction.msg->vss_hdr.operation;
+ int rc;
struct cn_msg *msg;
struct hv_vss_msg *vss_msg;
@@ -111,7 +112,12 @@
vss_msg->vss_hdr.operation = op;
msg->len = sizeof(struct hv_vss_msg);
- cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+ rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+ if (rc) {
+ pr_warn("VSS: failed to communicate to the daemon: %d\n", rc);
+ if (cancel_delayed_work_sync(&vss_timeout_work))
+ vss_respond_to_host(HV_E_FAIL);
+ }
kfree(msg);
return;