Re: Btrfs progs release 6.19

[David Sterba <dsterba@suse.cz>]

On Sat, Feb 14, 2026 at 03:18:51AM +0100, Christoph Anton Mitterer wrote:
> On Fri, 2026-02-13 at 19:56 +0100, David Sterba wrote:
> >   * make block-group-tree default (support since linux 6.1), use -O
> > ^bgt to
> >     unset it for backward compatibility
> 
> I guess that also mean that this is now considered stable and has been
> very well tested?

Yes, the bgt feature has been part of the fstests runs.

> How about migrating an existing fs to use the block-group-tree (with
> btrfstune --convert-to-block-group-tree)... has that also been well
> tested and is considered safe to be used on filesystems with precious
> data?

The in-place conversions are a bit more tricky as they start from an
existing filesystem and there's a possibility of finding some corner
case. Last time this was in 6.15.

It should be doable to test the conversion using device mapper snapshot
devices on an existing valuable filesystem without destroying it.