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btrfs check
./btrfs check --repair /dev/mapper/root
enabling repair mode
Checking filesystem on /dev/mapper/root
UUID: e8e39b07-89c3-4141-897b-81b4bcc2a469
Fixed 0 roots.
checking extents
No device size related problem found
checking free space cache
checking fs roots
checking csums
checking root refs
found 409997541376 bytes used, no error found
total csum bytes: 397600512
total tree bytes: 1908146176
total fs tree bytes: 1381990400
total extent tree bytes: 74776576
btree space waste bytes: 273788703
file data blocks allocated: 428503007232
referenced 416323796992
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