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virtio: Introduce virtqueue_get_avail_bytes()
The current virtqueue_avail_bytes() is oddly named, and checks if a particular number of bytes are available in a vq. A better API is to fetch the number of bytes available in the vq, and let the caller do what's interesting with the numbers. Introduce virtqueue_get_avail_bytes(), which returns the number of bytes for buffers marked for both, in as well as out. virtqueue_avail_bytes() is made a wrapper over this new function. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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