Hello,

using kernel  4.4.5 and btrfs-progs 4.4.1, I today ran a scrub on my
2x1Tb btrfs raid1 array and it finished with 36 unrecoverable errors
[1], all blaming the treeblock 741942071296. Running "btrfs check
--readonly" on one of the devices lists that extent as corrupted [2].

How can I recover, how much did I really lose, and how can I prevent
it from happening again?
If you need me to provide more info, do tell.

[1] http://cwillu.com:8080/188.110.141.36/1
[2] http://pastebin.com/xA5zezqw

Regards,
Soukyuu

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