linux-kernel - Re: [PATCH 21/38] union-mount: Support for mounting union mount file systems

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Message-ID: <20100804195008.GB2134@shell>
Date:	Wed, 4 Aug 2010 15:50:08 -0400
From:	Valerie Aurora <vaurora@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...iv.linux.org.uk, jblunck@...e.de, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 21/38] union-mount: Support for mounting union mount file systems

On Wed, Aug 04, 2010 at 04:55:39PM +0200, Miklos Szeredi wrote:
> On Tue, 15 Jun 2010, Valerie Aurora wrote:
> > Create and tear down union mount structures on mount.  Check
> > requirements for union mounts.  This version clones the read-only
> > mounts and puts them in an array hanging off the superblock of the
> > topmost layer.
> 
> If I do
> 
>   mount -r fs1 /mnt
>   mount -r fs2 /mnt
>   mount -ounion fs3 /mnt
> 
> then only fs2 and fs3 will be unioned.
> 
> Or how are multiple read-only layers supposed to work?

You have it right, this is a bug in lookup in the last version I sent
out.  I had commented out the part of my test suite that actually
tested three layer mounts so I didn't notice when I broke it. :/ I'll
post a new version with the fix today.

-VAL
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