QA output created by 110

=== Reconstructable filename ===

Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=t.IMGFMT.base
image: TEST_DIR/t.IMGFMT
file format: IMGFMT
virtual size: 64M (67108864 bytes)
backing file: t.IMGFMT.base (actual path: TEST_DIR/t.IMGFMT.base)

=== Non-reconstructable filename ===

qemu-img: Cannot use relative backing file names for 'json:{"driver": "IMGFMT", "file": {"set-state.0.event": "read_aio", "image": {"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, "driver": "blkdebug", "set-state.0.new_state": 42}}'

=== Backing name is always relative to the backed image ===

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=t.IMGFMT.base
*** done