linux-kernel - Re: [RFC PATCH] xfs: show uuid when mount fails due to duplicate uuid

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Date:	Thu, 12 Jan 2012 11:14:10 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>
Cc:	Ben Myers <bpm@....com>, Alex Elder <aelder@....com>,
	Alex Elder <elder@...nel.org>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, xfs-masters@....sgi.com,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [RFC PATCH] xfs: show uuid when mount fails due to duplicate uuid

On Thu, Jan 12, 2012 at 11:47:20AM +0900, Mitsuo Hayasaka wrote:
> When a system tries to mount a filesystem (FS) using UUID, the xfs
> returns -EINVAL and shows a message if a FS with the same UUID has
> been already mounted. It is useful to output the duplicate UUID
> with it.

Looks good to me,


Reviewed-by: Christoph Hellwig <hch@....de>

> -	xfs_warn(mp, "Filesystem has duplicate UUID - can't mount");
> +	xfs_warn(mp,
> +		"Filesystem has duplicate UUID - can't mount: uuid = %pU",
> +		uuid);

Maybe we could write this a bit nicer as:

	xfs_warn(mp, "Filesystem has duplicate UUID %p - can't mount", uuid);

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