Am Sun, 28 Aug 2016 08:27:59 +0000 (UTC)
schrieb Duncan <1i5t5.dun...@cox.net>:

> > However, I miss two things:
> > - How do I see on an existing FS which of these features are on?
> >   btrfstune (it seems) can only "set", but not "get" the feature
> > flags.  
> 
> Try btrfs-show-super <device>.  The incompat_flags section enumerates
> the flags that are on (at least with a reasonably new btrfs-progs).

It's also in the sub directories of /sys/fs/btrfs...

-- 
Regards,
Kai

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