[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  2005-03-02 00:45 UTC -------
Message-ID: <811xay7vso.wl at omega.webmasters.gr.jp>
Date: Wed, 02 Mar 2005 09:09:43 +0900
From: GOTO Masanori <gotom at debian.or.jp>
To: Goswin von Brederlow <brederlo at informatik.uni-tuebingen.de>,
	297010 at bugs.debian.org
Cc: GOTO Masanori <gotom at debian.or.jp>,
	Bastian Blank <waldi at debian.org>
Subject: Re: Bug#297010: linux-kernel-header: O_NOATIME needed for lvm

At Mon, 28 Feb 2005 03:48:00 +0100,
Goswin von Brederlow wrote:
> GOTO Masanori <gotom at debian.or.jp> writes:
> > At Sat, 26 Feb 2005 14:40:33 +0100,
> > Goswin Brederlow wrote:
> >> 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.
> 
> The docs (man 2 open) document O_NOATIME but the headers are lacking
> behind in carrying the implementation. So you got stuck with it as
> primary package. Notice that lvm2 is secondary. If lvm adds a
> workaround the priority drops but you are still missing documented
> behaviour, behaviour the sarge kernel (2.6.8) has.

> Bastian's patch is just a workaround around the bug not its solution.

...So why did you submit this bug as "severity: critical" assigned to
linux-kernel-header?  What the real solution to fix this report?

Can your problem be fixed to define O_NOATIME in lvm2 or
linux-kernel-headers package?

Regards,
-- gotom




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