From: Marc Joliet <marcec@gmx.de>
To: linux-btrfs@vger.kernel.org
Subject: Re: Poll: time to switch skinny-metadata on by default?
Date: Mon, 27 Oct 2014 02:24:15 +0100 [thread overview]
Message-ID: <20141027022415.14940745@marcec.fritz.box> (raw)
In-Reply-To: <CF7BFF69-89E5-44EE-8CC3-E306531B88FE@colorremedies.com>
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Am Sat, 25 Oct 2014 14:35:33 -0600
schrieb Chris Murphy <lists@colorremedies.com>:
>
> On Oct 25, 2014, at 2:33 PM, Chris Murphy <lists@colorremedies.com> wrote:
>
> >
> > On Oct 25, 2014, at 6:24 AM, Marc Joliet <marcec@gmx.de> wrote:
> >>
> >> First of all: does grub2 support booting from a btrfs file system with
> >> skinny-metadata, or is it irrelevant?
> >
> > Seems plausible if older kernels don't understand skinny-metadata, that GRUB2 won't either. So I just tested it with grub2-2.02-0.8.fc21 and it works. I'm surprised, actually.
>
> I don't understand the nature of the incompatibility with older kernels. Can they not mount a Btrfs volume even as ro? If so then I'd expect GRUB to have a problem, so I'm going to guess that maybe a 3.9 or older kernel could ro mount a Btrfs volume with skinny extents and the incompatibility is writing.
That sounds plausible, though I hope for a definitive answer. (FWIW, I
originally asked because I couldn't find any commits to grub2 related to skinny
metadata; the updates to the btrfs driver were fairly sparse.)
--
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup
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next prev parent reply other threads:[~2014-10-27 1:24 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 11:33 Poll: time to switch skinny-metadata on by default? David Sterba
2014-10-20 16:34 ` David Sterba
2014-10-21 9:29 ` Duncan
2014-10-21 11:02 ` Austin S Hemmelgarn
2014-10-21 12:35 ` Konstantinos Skarlatos
2014-10-21 16:40 ` Rich Freeman
2014-10-22 2:08 ` Duncan
2014-10-22 12:49 ` Dave
2014-10-23 2:41 ` Duncan
2014-10-23 13:37 ` David Sterba
2014-10-23 14:47 ` Tobias Geerinckx-Rice
2014-10-24 1:33 ` Duncan
2014-10-25 12:24 ` Marc Joliet
2014-10-25 19:58 ` Marc Joliet
2014-10-27 1:30 ` Marc Joliet
2014-10-25 20:33 ` Chris Murphy
2014-10-25 20:35 ` Chris Murphy
2014-10-27 1:24 ` Marc Joliet [this message]
2014-10-27 7:50 ` Duncan
2014-10-27 4:39 ` Zygo Blaxell
2014-10-27 7:16 ` Duncan
-- strict thread matches above, loose matches on Subject: below --
2014-10-17 12:30 Petr Janecek
2014-10-17 18:25 ` Josef Bacik
2014-10-18 11:21 ` Petr Janecek
2014-10-18 14:04 ` Josef Bacik
2014-10-18 15:52 ` Wang Shilong
2014-10-18 15:53 ` Josef Bacik
2014-10-18 16:01 ` Wang Shilong
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