Mounting bad btrfs img file

[Eric Wolf <19wolf@gmail.com>]

My OS drive had issues with metadata (disk full even though it wasn't
etc), and so I reinstalled my OS and now I'm learning that my backup
img is bad. What steps should I go through to fix it?


$ sudo mount -o
offset=8999927808,loop,recovery,ro,nospace_cache,nospace_cache
/data/Backup/Nephele.img /mnt

mount: wrong fs type, bad option, bad superblock on /dev/loop0,

       missing codepage or helper program, or other error


       In some cases useful info is found in syslog - try

       dmesg | tail or so.

nephele@Nephele:/data/Backup$ dmesg | tail

[48539.443711] BTRFS error (device loop0): parent transid verify
failed on 98021605376 wanted 85976 found 85978

[48539.473837] BTRFS error (device loop0): parent transid verify
failed on 98021605376 wanted 85976 found 85978

[48539.485032] BTRFS: failed to read tree root on loop0

[48539.494782] BTRFS error (device loop0): parent transid verify
failed on 98049490944 wanted 85975 found 85981

[48539.510541] BTRFS error (device loop0): parent transid verify
failed on 98049490944 wanted 85975 found 85981

[48539.523464] BTRFS: failed to read tree root on loop0

[48539.526374] BTRFS error (device loop0): parent transid verify
failed on 98020917248 wanted 85974 found 85979

[48539.545628] BTRFS error (device loop0): parent transid verify
failed on 98020917248 wanted 85974 found 85979

[48539.560595] BTRFS: failed to read tree root on loop0

[48539.589038] BTRFS: open_ctree failed