QA output created by 187
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864

Start from read-only

Block node is read-only
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Block node is read-only

Start from read-write

wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
write failed: Operation not permitted
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done