xen: Don't peek behind the BlockDriverState abstraction
First offender is xen_config_dev_blk()'s use of disk->bdrv->filename. Get the filename from disk->opts instead. Same result, except for snapshots: there, we now get the filename specified by the user instead of the name of the temporary image created by bdrv_open(). Should be an improvement. Second offender is blk_init()'s use of blkdev->bs->drv->format_name. Simply use the appropriate interface to get the format name. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Acked-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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