QA output created by 267
step 1......mkfs.btrfs
wrote 262144/262144 bytes
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step 2......corrupt file extent
ERROR: cannot scan /dev/nullb0: Input/output error
ERROR: cannot scan /dev/nullb0: Input/output error
ERROR: cannot scan /dev/nullb0: Input/output error
ERROR: cannot scan /dev/nullb0: Input/output error
ERROR: cannot scan /dev/nullb0: Input/output error
ERROR: cannot scan /dev/nullb0: Input/output error
step 3......repair the bad copy
step 4......check if the repair worked
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read 512/512 bytes
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