devmapper: Add block discard support
devmapper: Add block discard support

rancherio/volmgr,rancherio/rancher-volume,mehulsbhatt/convoy,rancher/rancher-volume,moypray/convoy,rancher/rancher-volume,medallia/convoy,dx9/convoy,nickvanw/convoy,rancherio/rancher-volume,aruneli/convoy,nickvanw/convoy,rancher/convoy,rancher/rancher-volume,moypray/convoy,aruneli/convoy,dx9/convoy,jinuxstyle/convoy,aruneli/convoy,jinuxstyle/convoy,rancherio/rancher-volume,mehulsbhatt/convoy,medallia/convoy,rancherio/volmgr,nickvanw/convoy,rancherio/volmgr,mehulsbhatt/convoy,medallia/convoy,moypray/convoy,dx9/convoy,rancher/convoy,jinuxstyle/convoy,rancher/convoy