btrfs check --repair (2)

enabling repair mode
Checking filesystem on /dev/mapper/newdevice
UUID: 77ed8441-2919-4e70-802f-2df93dad2735
checking extents
Incorrect local backref count on 676227178496 parent 119455744 owner 0 offset 0 found 0 wanted 1 back 0xd2a9d70
Backref disk bytenr does not match extent record, bytenr=676227178496, ref bytenr=144115188075856667
Backref 676227178496 root 1040 owner 13758461 offset 0 num_refs 0 not found in extent tree
Incorrect local backref count on 676227178496 root 1040 owner 13758461 offset 0 found 1 wanted 0 back 0x2820750
backpointer mismatch on [676227178496 4096]
repair deleting extent record: key 676227178496 168 4096
adding new data backref on 676227178496 root 1001 owner 13758461 offset 0 found 1
adding new data backref on 676227178496 root 437 owner 13758461 offset 0 found 1
adding new data backref on 676227178496 root 1029 owner 13758461 offset 0 found 1
adding new data backref on 676227178496 root 1036 owner 13758461 offset 0 found 1
adding new data backref on 676227178496 root 1038 owner 13758461 offset 0 found 1
adding new data backref on 676227178496 root 1040 owner 13758461 offset 0 found 1
Incorrect local backref count on 676402864128 parent 119455744 owner 0 offset 0 found 0 wanted 1 back 0xd27b390
Backref disk bytenr does not match extent record, bytenr=676402864128, ref bytenr=3095380318887084032
Backref 676402864128 root 1040 owner 13735586 offset 0 num_refs 0 not found in extent tree
Incorrect local backref count on 676402864128 root 1040 owner 13735586 offset 0 found 1 wanted 0 back 0x28207f0
backpointer mismatch on [676402864128 32768]
repair deleting extent record: key 676402864128 168 32768
adding new data backref on 676402864128 root 1001 owner 13735586 offset 0 found 1
adding new data backref on 676402864128 root 437 owner 13735586 offset 0 found 1
adding new data backref on 676402864128 root 1029 owner 13735586 offset 0 found 1
adding new data backref on 676402864128 root 1036 owner 13735586 offset 0 found 1
adding new data backref on 676402864128 root 1038 owner 13735586 offset 0 found 1
adding new data backref on 676402864128 root 1040 owner 13735586 offset 0 found 1
repaired damaged extent references
Fixed 0 roots.
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 373166661632 bytes used err is 0
total csum bytes: 291707268
total tree bytes: 4968841216
total fs tree bytes: 4289757184
total extent tree bytes: 293126144
btree space waste bytes: 904137554
file data blocks allocated: 3581927628800
 referenced 467705069568