From: "Björn Kalkbrenner" <terminar@cyberphoria.org>
To: linux-btrfs@vger.kernel.org
Subject: Problems with set-default, home subvolume and snapshot
Date: Mon, 05 Sep 2011 12:13:25 +0200 [thread overview]
Message-ID: <4E64A0C5.2060409@cyberphoria.org> (raw)
Hi,
i've got an interesting btrfs subvolume problem which i can't
understand... Maybe someone here can give me a tip because i think
that's only a user error...
I had a root btrfs on / and made a subvolume some month ago for my home
on /home (i think cwd was / and i used "btrfs subvolume create /home").
On friday i wanted to try an update of my distribution, so i
created a snapshot on /snapshots/20110902 (cwd was / and i entered
"btrfs subvolume snapshot / /snapshots/20110902).
Today i realized that my update failed, so i did
"btrfs set-default 257 /" (257 is the id of the snapshot from friday)..=
=2E
When i rebooted, the trouble began. The mounted "home" subvolume was
empty (even if mounted) and the new root from today which i used before
trying the set-default seems to be lost. Ok, not the main problem...
The snapshot from friday was mounted correctly on boot as root.
The directory /snapshots/20110902 is empty but it is still listed as
subvolume. My "home" was also empty but still listed as subvolume.
I tried to remove the subvolume, i tried to remove the directory, both
not working.
Then i tried to
"mount -o subvolumeid=3D256 /dev/mapper/root /home" (id of home subvol)
and the content of my home is back...
My questions are:
1. where is the "original" root from today morning before i did
set-default? Lost?
2. why can't i do "mount -o subvolume=3Dhome /dev/mapper/root /home"
anymore? To be more exact, i can, but why is it empty and why is it
working when i enter the subvolume id?
3. I am now using the snapshot /snapshots/20110902 but what is
/snapshots/20110902 now and why is it still listed? It's empty?
4. can i now delete the snapshots/20110902 or will that drop my current
active working root?
5. can i rename snapshots, e.g. the snapshots/20110902 or "home" to
"home-20110905"?
6. is my btrfs filesystem broken now and should i recreate the whole
thing or is it safe to use it?
Bye
Bj=F6rn
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next reply other threads:[~2011-09-05 10:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-05 10:13 Björn Kalkbrenner [this message]
2011-09-05 10:30 ` Problems with set-default, home subvolume and snapshot 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
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