這是本文件的舊版！

回復快照

btrfs send /mnt/btr_backup/data.20150101 | btrfs receive /mnt/btr_pool/
btrfs subvolume snapshot /mnt/btr_pool/data.20150101 /mnt/btr_pool/data
btrfs subvolume delete /mnt/btr_pool/data.20150101

scrub

btrfs scrub start /

找出 csum error 的檔案

find /mount-point -type f -exec cp {} /dev/null \;