xen, blkfront: factor out flush-related checks from do_blkif_request()
This commit factors out some checks related to the request insertion path, which can be done in an function instead of by itself. Reviewed-by: NDavid Vrabel <david.vrabel@citrix.com> Signed-off-by: NArianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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