block/parallels.c | 389 ++++++++++++++++++++------ block/parallels.h | 3 + tests/qemu-iotests/131 | 52 ++++ tests/qemu-iotests/131.out | 60 ++++ tests/qemu-iotests/tests/parallels-checks | 76 ++++- tests/qemu-iotests/tests/parallels-checks.out | 65 ++++- 6 files changed, 544 insertions(+), 101 deletions(-)