linux-ext4 - Re: [PATCH] ext4: add support for multiple mount protection

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Message-ID: <20110523021951.GI10009@thunk.org>
Date:	Sun, 22 May 2011 22:19:51 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Johann Lombardi <johann@...mcloud.com>
Cc:	linux-ext4@...r.kernel.org, Andreas Dilger <adilger@...mcloud.com>
Subject: Re: [PATCH] ext4: add support for multiple mount protection

On Mon, May 02, 2011 at 11:36:36AM +0200, Johann Lombardi wrote:
> Prevent an ext4 filesystem from being mounted multiple times.
> A sequence number is stored on disk and is periodically updated (every 5
> seconds by default) by a mounted filesystem.
> At mount time, we now wait for s_mmp_update_interval seconds to make sure
> that the MMP sequence does not change.
> In case of failure, the nodename, bdevname and the time at which the MMP
> block was last updated is displayed.
> 
> Signed-off-by: Andreas Dilger <adilger@...mcloud.com>
> Signed-off-by: Johann Lombardi <johann@...mcloud.com>

Added to the ext4 tree, thanks.

					- Ted
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