QA output created by 112 === refcount_bits limits === qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount_bits=-1 qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 1 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 64 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 16 === refcount_bits and compat=0.10 === Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 16 qemu-img: TEST_DIR/t.IMGFMT: Different refcount widths than 16 bits require compatibility level 1.1 or above (use compat=1.1 or greater) Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 qemu-img: TEST_DIR/t.IMGFMT: Different refcount widths than 16 bits require compatibility level 1.1 or above (use compat=1.1 or greater) Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 === Snapshot limit on refcount_bits=1 === Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 1 wrote 512/512 bytes at offset 0 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) qemu-img: Could not create snapshot 'foo': -22 (Invalid argument) Leaked cluster 6 refcount=1 reference=0 1 leaked clusters were found on the image. This means waste of disk space, but no harm to data. === Snapshot limit on refcount_bits=2 === Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 2 wrote 512/512 bytes at offset 0 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) qemu-img: Could not create snapshot 'baz': -22 (Invalid argument) Leaked cluster 7 refcount=1 reference=0 1 leaked clusters were found on the image. This means waste of disk space, but no harm to data. === Compressed clusters with refcount_bits=1 === Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 1 wrote 65536/65536 bytes at offset 0 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 65536/65536 bytes at offset 65536 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) No errors were found on the image. === MSb set in 64 bit refcount === Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 64 wrote 512/512 bytes at offset 0 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) wrote 512/512 bytes at offset 0 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) === Snapshot on maximum 64 bit refcount value === Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount bits: 64 wrote 512/512 bytes at offset 0 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) qemu-img: Could not create snapshot 'foo': -22 (Invalid argument) Leaked cluster 5 refcount=18446744073709551615 reference=1 Leaked cluster 6 refcount=1 reference=0 2 leaked clusters were found on the image. This means waste of disk space, but no harm to data. *** done