Re: is this the right place for a question on how to repair a broken btrfs file system?

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On 2019/12/6 上午11:40, Christian Wimmer wrote:
> Hi Hugo and Qu,
> 
> I installed Arch Linux latest version and here are the results:
> 
> 
> # btrfs ins dump-tree -t root /dev/sde1 2>&1
> btrfs-progs v5.3.1 
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> bad tree block 5349895454720, bytenr mismatch, want=5349895454720,
> have=14275350892879035392
> Couldn't setup device tree
> ERROR: unable to open /dev/sde1
> # 

My bad, after looking into the code, we skipped all other trees but not
device tree.
That why even latest btrfs-progs won't work.

I have sent a patch to you, which you can apply it on btrfs-progs v5.4,
and compile it (no need to install), then use that compiled btrfs
command to retry.

For recompile btrfs-progs, you may need the following packages (and
groups) under Arch:

# pacman -S base-devel e2fsprogs asciidoc xmlto xmltoman attr libutil-linux

Then you should be able to continue.

Sorry for the inconvenience.

Thanks,
Qu

> 
> 
> 
> # btrfs ins dump-tree -t extent /dev/sde1 2>&1 >/dev/null
> btrfs-progs v5.3.1 
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> bad tree block 5349895454720, bytenr mismatch, want=5349895454720,
> have=14275350892879035392
> Couldn't setup device tree
> ERROR: unable to open /dev/sde1
>
> 
> 
> # btrfs ins dump-tree -t chunk /dev/sde1
> btrfs-progs v5.3.1 
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> bad tree block 5349895454720, bytenr mismatch, want=5349895454720,
> have=14275350892879035392
> Couldn't setup device tree
> ERROR: unable to open /dev/sde1
>
> 
> 
> # btrfs ins dump-tree -t 5 /dev/sde1 2>&1 >/dev/null
> btrfs-progs v5.3.1 
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> checksum verify failed on 5349895454720 found 000000A8 wanted 00000000
> bad tree block 5349895454720, bytenr mismatch, want=5349895454720,
> have=14275350892879035392
> Couldn't setup device tree
> ERROR: unable to open /dev/sde1
>
> 
> What could be the next steps?
> 
> 
> Thanks a lot for your patience and help!
> 
> Chris
> 

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