• Vitaly Kuznetsov's avatar
    Drivers: hv: kvp,vss: Fast propagation of userspace communication failure · 8d9560eb
    Vitaly Kuznetsov authored
    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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    8d9560eb
hv_snapshot.c 7.2 KB