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blockdev: add sync mode to drive-backup QMP command
The drive-backup command is similar to the drive-mirror command, exceptno guest data written after the command executes gets copied. Add async mode argument which determines whether the entire disk is copied,...
qemu-iotests: add 055 drive-backup test case
Testing drive-backup is similar to image streaming and drive mirroring.This test case is based on 041.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>Signed-off-by: Kevin Wolf <kwolf@redhat.com>