btrfs check (3)

Checking filesystem on /dev/mapper/newdevice
UUID: 77ed8441-2919-4e70-802f-2df93dad2735
checking extents
checking free space cache
cache and super generation don't match, space cache will be invalidated
checking fs roots
checking csums
checking root refs
found 373166678016 bytes used err is 0
total csum bytes: 291707268
total tree bytes: 4968857600
total fs tree bytes: 4289757184
total extent tree bytes: 293142528
btree space waste bytes: 904153696
file data blocks allocated: 3581927628800
 referenced 467705069568