tree 112e4e184a29e64b618f83da873333abae25f11e
parent b3cb0d6adc4bbc70b5e37e49a6068e973545ead7
author Li Dongyang <lidongyang@novell.com> 1314873549 +0800
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1318513711 -0400

xen-blkfront: Handle discard requests.

If the backend advertises 'feature-discard', then interrogate
the backend for alignment and granularity. Setup the request
queue with the appropiate values and send the discard operation
as required.

Signed-off-by: Li Dongyang <lidongyang@novell.com>
[v1: Amended commit description]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>