block: Introduce bdrv_driver_preadv()
This is a function that simply calls into the block driver for doing a read, providing the byte granularity interface we want to eventually have everywhere, and using whatever interface that driver supports. For now, this is just a wrapper for calling bs->drv->bdrv_co_readv(). Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com>
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