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The raw_get_aio_fd() function allows virtio-blk-data-plane to get the file descriptor of a raw image file with Linux AIO enabled. This interface is really a layering violation that can be resolved once the block layer is able to run outside the global mutex - at that point virtio-blk-data-plane will switch from custom Linux AIO code to using the block layer. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>