Yet Another Newb Question...

Yet Another Newb Question...

[Ken D'Ambrosio]

(Asking this question on this list kinda makes me wonder if there shouldn't be
a btrfs-users list where folks could ask questions just like this without
pestering developers...)

Anyway -- I had a root partition with a /snapshots directory, in which I placed
a bunch of snapshots.  At one point, I goofed stuff up, and decided to revert
my root (using "btrfs sub set-default") to one of the snapshots.  Rebooted, and
it worked great -- just like I'd hoped.

But where'd the snapshots in /snapshots go?

I mean, I still see them if I do a "btrfs sub list", but how do I *get* to them
for, say, deleting?  (I can still mount them via "-o subvolid", but that's not
quite the same thing.)

Suggestions?

Thanks kindly!

-Ken

Re: Yet Another Newb Question...

[Hugo Mills]

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On Wed, Dec 07, 2011 at 04:14:46PM -0500, Ken D'Ambrosio wrote:
> (Asking this question on this list kinda makes me wonder if there shouldn't be
> a btrfs-users list where folks could ask questions just like this without
> pestering developers...)
> 
> Anyway -- I had a root partition with a /snapshots directory, in which I placed
> a bunch of snapshots.  At one point, I goofed stuff up, and decided to revert
> my root (using "btrfs sub set-default") to one of the snapshots.  Rebooted, and
> it worked great -- just like I'd hoped.
> 
> But where'd the snapshots in /snapshots go?

   Where they always were -- it's just that you've mounted a different
bit of the filesystem, so you can't see them. :)

> I mean, I still see them if I do a "btrfs sub list", but how do I *get* to them
> for, say, deleting?  (I can still mount them via "-o subvolid", but that's not
> quite the same thing.)

   If you've got subvolumes outside your mounted filesystem, then you
can either reach them by mounting via subvolid, or by mounting the
top-level subvolume with subvolid=0 (on, say, /media/btrfs-top) and
then navigating through that to the subvolume you want.

   See (my) recommended filesystem structure on the wiki[1].

   Hugo.

http://btrfs.ipv5.de/index.php?title=SysadminGuide#Managing_snapshots

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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  --- There are three things you should never see being made: laws, ---  
                        standards,  and sausages.                        

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