QA output created by 270
step 1......mkfs.btrfs
wrote 131072/131072 bytes
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
ERROR: cannot scan /dev/nullb0: Input/output error
step 2......corrupt file extent
step 3......repair the bad copy
step 4......check if the repair worked
XXXXXXXX:  78 5e ec d0 81 10 00 00 00 03 21 7f 95 a7 9c c7  x...............
XXXXXXXX:  ae 10 2a 0c 18 30 60 c0 80 01 03 06 0c 18 30 60  .....0........0.
XXXXXXXX:  c0 80 81 f7 81 01 00 00 ff ff ec d0 81 0c 00 00  ................
XXXXXXXX:  00 c0 20 7f eb 7b 7c 21 14 9f 01 03 06 0c 18 30  ...............0
XXXXXXXX:  60 c0 80 01 03 06 0c 18 30 f0 1f 08 00 00 ff ff  ........0.......
XXXXXXXX:  ec d0 81 0c 00 00 00 c0 20 7f eb 7b 7c 21 14 a1  ................
XXXXXXXX:  01 03 06 0c 18 30 60 c0 80 01 03 06 0c 18 30 f0  .....0........0.
XXXXXXXX:  1f 08 00 00 ff ff ec d0 81 0c 00 00 00 c0 20 7f  ................
XXXXXXXX:  eb 7b 7c 21 14 a1 01 03 06 0c 18 30 60 c0 80 01  ...........0....
XXXXXXXX:  03 06 0c 18 30 f0 1f 08 00 00 ff ff ec d0 81 0c  ....0...........
XXXXXXXX:  00 00 00 c0 20 7f eb 7b 7c 21 14 a1 01 03 06 0c  ................
XXXXXXXX:  18 30 60 c0 80 01 03 06 0c 18 30 f0 1f 08 00 00  .0........0.....
XXXXXXXX:  ff ff ec d0 81 0c 00 00 00 c0 20 7f eb 7b 7c 21  ................
XXXXXXXX:  14 a1 01 03 06 0c 18 30 60 c0 80 01 03 06 0c 18  .......0........
XXXXXXXX:  30 f0 1f 08 00 00 ff ff ec d0 81 0c 00 00 00 c0  0...............
XXXXXXXX:  20 7f eb 7b 7c 21 14 a1 01 03 06 0c 18 30 60 c0  .............0..
XXXXXXXX:  80 01 03 06 0c 18 30 f0 1f 08 00 00 ff ff ec d0  ......0.........
XXXXXXXX:  81 0c 00 00 00 c0 20 7f eb 7b 7c 21 14 a1 01 03  ................
XXXXXXXX:  06 0c 18 30 60 c0 80 01 03 06 0c 18 30 f0 1f 08  ...0........0...
XXXXXXXX:  00 00 ff ff ec d0 81 0c 00 00 00 c0 20 7f eb 7b  ................
XXXXXXXX:  7c 21 14 a1 01 03 06 0c 18 30 60 c0 80 01 03 06  .........0......
XXXXXXXX:  0c 18 30 f0 1f 08 00 00 ff ff ec d0 81 0c 00 00  ..0.............
XXXXXXXX:  00 c0 20 7f eb 7b 7c 21 14 a1 01 03 06 0c 18 30  ...............0
XXXXXXXX:  60 c0 80 01 03 06 0c 18 30 f0 1f 08 00 00 ff ff  ........0.......
XXXXXXXX:  ec d0 81 0c 00 00 00 c0 20 7f eb 7b 7c 21 14 a1  ................
XXXXXXXX:  01 03 06 0c 18 30 60 c0 80 01 03 06 0c 18 30 f0  .....0........0.
XXXXXXXX:  1f 08 00 00 ff ff ec d0 81 0c 00 00 00 c0 20 7f  ................
XXXXXXXX:  eb 7b 7c 21 14 a1 01 03 06 0c 18 30 60 c0 80 01  ...........0....
XXXXXXXX:  03 06 0c 18 30 f0 1f 08 00 00 ff ff ec d0 81 0c  ....0...........
XXXXXXXX:  00 00 00 c0 20 7f eb 7b 7c 21 14 a1 01 03 06 0c  ................
XXXXXXXX:  18 30 60 c0 80 01 03 06 0c 18 30 f0 1f 08 00 00  .0........0.....
XXXXXXXX:  ff ff ec d0 81 0c 00 00 00 c0 20 7f eb 7b 7c 21  ................
read 512/512 bytes
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)