Re: corruption after block-group-tree conversion, how to recover? (data is readable)

[Ulli Horlacher <framstag@rus.uni-stuttgart.de>]

On Mon 2026-04-27 (07:48), Qu Wenruo wrote:

> 圚 2026/4/27 06:53, Thomas Debesse 写é":
> 
> > Hi, I just did a `btrfstune --convert-to-block-group-tree` conversion

Why should one execute this command?
For what...?


> > The system is running Ubuntu 24.04.4 with Linux 6.8.0-110-generic and
> > btrfs-progs 6.6.3-1.1build2.
> 
> Unfortunately the btrfs-progs is too old, and possibility the root cause.
> 
> There are some fixes in progs v6.15, thus it's strongly recommended to
> use progs newer than v6.15.

I also run Ubuntu 24.04.4 on many hosts and btrfs-progs 6.6.3-1.1build2 is
the newest Ubuntu package for it.

Is it recommendable to put btrfs v6.19.1 from
https://github.com/kdave/btrfs-progs in a PATH element in front?

I have now:

root@fex:~# type -a btrfs
btrfs is /opt/btrfs-tools/bin/btrfs
btrfs is /usr/bin/btrfs

root@fex:~# /opt/btrfs-tools/bin/btrfs version
btrfs-progs v6.19.1
-EXPERIMENTAL -INJECT +STATIC +LZO +ZSTD +UDEV +FSVERITY +ZONED CRYPTO=builtin

root@fex:~# /usr/bin/btrfs version
btrfs-progs v6.6.3

root@fex:~# uname -a
Linux fex 6.8.0-110-generic #110-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 19 15:09:20 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux


And a addon question:

  Static binaries

  The btrfs.box is an all-in-one tool in the busybox style, the
  functionality is determined by the binary names (either symlink,
  hardlink or a file copy).

I found no list which names are useful. By try-and-error I have:

root@fex:/opt/btrfs-tools/bin# ls -li btrfs btrfstune mkfs.btrfs
3214654 -rwxr-xr-x 4 framstag users 3653384 Mar 18 18:34 btrfs
3214654 -rwxr-xr-x 4 framstag users 3653384 Mar 18 18:34 btrfstune
3214654 -rwxr-xr-x 4 framstag users 3653384 Mar 18 18:34 mkfs.btrfs


-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK
Universitaet Stuttgart         E-Mail: horlacher@tik.uni-stuttgart.de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    https://www.tik.uni-stuttgart.de/
REF:<07db83f8-5769-4aaf-9f54-2711ddad9eea@suse.com>