xen-blkback: make the queue of free requests per backend
Remove the last dependency from blkbk by moving the list of free requests to blkif. This change reduces the contention on the list of available requests. Signed-off-by: NRoger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xen.org Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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