Re: snapshots of directories

[Adrian von Bidder <avbidder@fortytwo.ch>]

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On Tuesday 12 January 2010 03.19:34 TARUISI Hiroaki wrote:
> In btrfs, snapshot is a clone of subvolume, not arbitrary
> directory.
> You specified '/root' directory and it is not subvolume,
> snapshot is created for parent subvolume, root of filesystem.

... hence my proposal (haven't seen a comment so far) to have snapshot 
creation fail if the specified directory is not a subvol root.

cheers
-- vbi

> 
> Regards,
> taruisi
> 
> (2010/01/12 11:12), Michael Niederle wrote:
> > I try to take a snapshot of a single directory, e.g. root:
> >> btrfsctl -s root.2010-01-12 /root
> >
> > operation complete
> > Btrfs v0.19-4-gab8fb4c-dirty
> >
> > Then I take look what's inside the newly created snapshot:
> >> ls -l /root.2010-01-12/
> >
> > total 0
> > drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin
> > drwxr-xr-x 1 root root   76 2009-06-25  0:40:35 boot
> > drwxr-xr-x 1 root root 1756 2010-01-12  2:33:07 cmds
> > drwxr-xr-x 1 root root    0 2010-01-06 12:21:46 data
> > drwxr-xr-x 1 root root 4356 2010-01-12  2:07:00 dev
> > drwxr-xr-x 1 root root   42 2010-01-04 12:29:45 downloads
> > drwxr-xr-x 1 root root 4528 2010-01-12  2:12:12 etc
> > drwxr-xr-x 1 root root   52 2010-01-11 12:57:47 home
> > drwxr-xr-x 1 root root    0 2007-11-10  4:44:07 initrd
> > drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib
> > drwxr-xr-x 1 root root  124 2008-04-27 14:53:39 mnt
> > drwxr-xr-x 1 root root   62 2008-01-08  0:21:58 net
> > drwxr-xr-x 1 root root    0 2008-04-09  3:19:16 objects
> > drwxr-xr-x 1 root root  316 2009-12-28 23:23:13 opt
> > dr-xr-xr-x 1 root root    0 2007-11-10  3:35:28 proc
> > drwxr-xr-x 1 root root 7676 2010-01-11  0:35:41 root
> > drwxr-xr-x 1 root root    0 2010-01-12  1:56:17 save
> > drwxr-xr-x 1 root root    0 2010-01-12  1:55:58 save2
> > drwxr-xr-x 1 root root 3804 2010-01-06  2:36:08 sbin
> > drwxr-xr-x 1 root root    0 2007-11-10  3:35:28 sys
> > drwxr-xr-x 1 root root  358 2010-01-11 18:44:29 tmp
> > drwxr-xr-x 1 root root  176 2009-12-29 17:08:37 usr
> > drwxr-xr-x 1 root root   72 2010-01-05 20:03:00 var
> >
> > It seems that always a snapshot of the root is taken instead one of the
> > specified directory? Is this by design?
> >
> > Snapshotting the root works fine, but if you take several snapshots
> > it's a bit "recursive", because every new snapshot contains all
> > previous snapshots.
> >
> > Greetings, Michael
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