2012-05-28 12:37:00 -0600, Bruce Guenter:
> 
> Is there any way to mark existing snapshots as read-only? Making new
> ones read-only is easy enough, but what about existing ones?
[...]

you can always do

btrfs sub snap -r vol vol-ro
btrfs sub del vol
mv vol-ro vol

-- 
Stephane

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