linux-kernel - Re: XFS / Quota Bug in 2.6.17.x and 2.6.18x

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Message-ID: <20060728094254.F2196410@wobbly.melbourne.sgi.com>
Date:	Fri, 28 Jul 2006 09:42:54 +1000
From:	Nathan Scott <nathans@....com>
To:	ProfiHost - Stefan Priebe <s.priebe@...fihost.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: XFS / Quota Bug in  2.6.17.x and 2.6.18x

Hi Stefan,

On Thu, Jul 27, 2006 at 01:39:29PM +0200, ProfiHost - Stefan Priebe wrote:
> Hello!
> 
> The crash only occurs if you use quota and IDE without barrier support.
> 
> The Problem is, that on a new mount of a root filesystem - the flag 
> VFS_RDONLY is set - and so no barrier check is done before checking 
> quota. With this patch barrier check is done always. The partition 
> should not be mounted at that moment. For mount -o remount, rw or 
> something like this it uses another function where VFS_RDONLY is checked.

Ah, I see.  The patch isn't quite right, I think we will now need to
also add a test to xfs_mountfs_check_barriers() to ensure the device
beneath us is not bdev_read_only().

I'll add that and get the fix merged, thanks.

cheers.

-- 
Nathan
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