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