Hi all!

As Kevin reported, the test doesn't work on XFS, as it rely on disk
usage.

Fix it, switching to dirty bitmap for guest write tracking.

Vladimir Sementsov-Ogievskiy (2):
  iotests/backup-discard-source: convert size variable to be int
  iotests/backup-discard-source: don't use actual-size

 .../qemu-iotests/tests/backup-discard-source  | 39 ++++++++++++-------
 1 file changed, 25 insertions(+), 14 deletions(-)

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2.34.1