[Bug 6943] linux-kernel-header: O_NOATIME needed for lvm

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Ubuntu | linux-kernel-headers





------- Additional Comments From debzilla at ubuntu.com  2005-02-28 00:45 UTC -------
Message-ID: <81ekf17d6i.wl at omega.webmasters.gr.jp>
Date: Mon, 28 Feb 2005 09:15:01 +0900
From: GOTO Masanori <gotom at debian.or.jp>
To: Goswin Brederlow <brederlo at informatik.uni-tuebingen.de>,
	297010 at bugs.debian.org, Bastian Blank <waldi at debian.org>
Subject: Re: Bug#297010: linux-kernel-header: O_NOATIME needed for lvm

At Sat, 26 Feb 2005 14:40:33 +0100,
Goswin Brederlow wrote:
> Package: linux-kernel-headers
> Version: 2.5.999-test7-bk-17
> Severity: critical
> File: linux-kernel-header
> Justification: breaks the whole system
> 
> Hi,
> 
> when one tries to run pvmove or lvsnapshot on / the lvm will deadlock
> itself due to atime updates on /dev/ being blocked while the LVM is
> locked. Sine any read/write access to / will be blocked the system
> breaks.
> 
> To prevent this lvm uses O_NOATIME where available, which is still not
> the case in current linux-kernel-headers.

I couldn't understand why this problem is occured.  O_NOATIME was
introduced in 2.6.7.  Is the root of problem to upgrading lvm package?
Bastian's patch adds only O_NOATIME flag - this means that lvm can fix
using O_NOATIME in your new package.  In other words, lvm is
"severity: critical", but glibc is not.  lvm is kernel related
package, so depending on libc6 header sometimes causes problems.

So I recommend that lvm should use O_NOATIME definition in your
package for a while.

Regards,
-- gotom




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