tree a326648a01081363fdcc6ece7ef45b34e3a0b5eb
parent 5a18e67dfd515992076c5fcae47035fdd3ed2462
author Ming Lei <ming.lei@canonical.com> 1404468273 +0800
committer Stefan Hajnoczi <stefanha@redhat.com> 1404723917 +0200

block: block: introduce APIs for submitting IO as a batch

This patch introduces three APIs so that following
patches can support queuing I/O requests and submitting them
as a batch for improving I/O performance.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>