Re: interest in post-mortem examination of a BTRFS system and improving the btrfs-code?

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2019/4/5 下午3:41, Nik. wrote:
> 
> Below is the stderr of both commands:
> 
> # btrfs inspect dump-tree -t chunk /dev/md0>DT-chunk.log
> # btrfs inspect dump-tree -t extent /dev/md0>DT-extent.log
> ERROR: leaf 1894009225216 slot 30 pointer invalid, offset 146038 size 37
> leaf data limit 16283
> ERROR: skip remaining slots
> 
> Since the output on stdout is pretty long even after gzip, I am
> providing only the output of the first command as attachment. The output
> of the second command (25 MB after gzip -9) can be downloaded here:
> 
> https://cloud.avgustinov.eu/index.php/s/AgbwWyCrbYjenq8

Sorry, I should have use a more specific command to get a smaller output.
But anyway, your output is good enough for me to craft the fix patch.

Here is the dirty fix branch:
https://github.com/adam900710/btrfs-progs/tree/dirty_fix_for_nik

Compile the btrfs-progs as usual.
Just a late hint, you can disable document/btrfs-convert to reduce the
dependency:
$ ./configure --disable-documentation --disable-convert

Then, inside btrfs-progs directory, call:
# ./btrfs-corrupt-block -X /dev/md0

If everything goes correctly, it should output something like:
  Successfully repaired tree block at 1894009225216
(And please ignore any grammar error in my code)

After that, please run a "btrfs check --readonly" to ensure no other bit
flip in your fs.

Thanks,
Qu



> 
> Hope this is ok.
> 
> Regards,
> Nik.
> -


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