Dave posted on Wed, 22 Oct 2014 08:49:46 -0400 as excerpted:

> On Tue, Oct 21, 2014 at 10:08 PM, Duncan <1i5t5.dun...@cox.net> wrote:
>> As for the mounted filesystem question, since all it does is flip a
>> switch so that new metadata writes use the skinny-metadata code path,
>> it shouldn't be a problem.
> 
> Nope.  Just tried it here:
> 
> # btrfs --version Btrfs v3.16.1-42-g140eccb
> 
> # btrfstune -x /dev/dm-0 /dev/dm-0 is mounted

Thanks.

So btrfstune refuses to set the skinny-metadata flag at all on mounted 
devices.  Nicely reduces risk, /and/ answers the question. =:^)

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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