QA output created by 309

=== Initial image setup ===

Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=4194304
wrote 2097152/2097152 bytes at offset 0
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4194304 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
wrote 2097152/2097152 bytes at offset 1048576
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

=== Check allocation over NBD ===

[{ "start": 0, "length": 1048576, "depth": 1, "zero": false, "data": true, "offset": 327680},
{ "start": 1048576, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": 327680},
{ "start": 3145728, "length": 1048576, "depth": 1, "zero": true, "data": false}]
[{ "start": 0, "length": 3145728, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 3145728, "length": 1048576, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
[{ "start": 0, "length": 1048576, "depth": 0, "zero": true, "data": true, "offset": OFFSET},
{ "start": 1048576, "length": 2097152, "depth": 0, "zero": false, "data": false},
{ "start": 3145728, "length": 1048576, "depth": 0, "zero": false, "data": true, "offset": OFFSET}]
*** done