From: Hugo Mills <hugo@carfax.org.uk>
To: "Björn Kalkbrenner" <terminar@cyberphoria.org>,
linux-btrfs@vger.kernel.org
Subject: Re: Problems with set-default, home subvolume and snapshot
Date: Mon, 5 Sep 2011 14:57:40 +0100 [thread overview]
Message-ID: <20110905135740.GO9907@carfax.org.uk> (raw)
In-Reply-To: <20110905135129.GI11678@ds.suse.cz>
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On Mon, Sep 05, 2011 at 03:51:29PM +0200, David Sterba wrote:
> Hi,
>
> On Mon, Sep 05, 2011 at 12:13:25PM +0200, Björn Kalkbrenner wrote:
> > Then i tried to
> > "mount -o subvolumeid=256 /dev/mapper/root /home" (id of home subvol)
> > and the content of my home is back...
>
> this is a known limitation and a fix is pending in Josef's development
> tree
>
> http://git.kernel.org/?p=linux/kernel/git/josef/btrfs-work.git;a=commit;h=4fbb149dfc7454d0f233fa8e5b9167f3645c8fcc
>
>
> "Btrfs: fix how we mount subvol=<whatever>
>
> We've only been able to mount with subvol=<whatever> where whatever was
> a subvol within whatever root we had as the default. This allows us to
> mount -o subvol=path/to/subvol/you/want relative from the normal
> fs_tree root. Thanks,"
>
> currently, the /home subvolume is searched inside the volume set by
> 'set-default'. When you change it to an alternative root snapshot, the
> '/home' subvolume lookup fails as you've seen.
>
> The patch changes it so that the subvolumes are always looked up to the
> original default root subvolume (I don't know of a better name, internal
> id 5 or alse selectable by subvolid=0).
I've always tried to refer to it as the "top level" or "subvolid=0".
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Always be sincere, whether you mean it or not. ---
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prev parent reply other threads:[~2011-09-05 13:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-05 10:13 Problems with set-default, home subvolume and snapshot Björn Kalkbrenner
2011-09-05 10:30 ` Hugo Mills
2011-09-05 12:20 ` Björn Kalkbrenner
2011-09-05 12:45 ` Hugo Mills
2011-09-05 14:31 ` Björn Kalkbrenner
2011-09-07 6:47 ` Björn Kalkbrenner
2011-09-05 13:07 ` Ilya Dryomov
2011-09-05 14:43 ` Björn Kalkbrenner
2011-09-06 12:16 ` Calvin Walton
2011-09-05 13:51 ` David Sterba
2011-09-05 13:57 ` Hugo Mills [this message]
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