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

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Message-Id: <E1OgfNb-0000ok-7p@pomaz-ex.szeredi.hu>
Date:	Wed, 04 Aug 2010 16:55:39 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Valerie Aurora <vaurora@...hat.com>
CC:	viro@...iv.linux.org.uk, miklos@...redi.hu, jblunck@...e.de,
	hch@...radead.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, vaurora@...hat.com
Subject: Re: [PATCH 21/38] union-mount: Support for mounting union mount file systems

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?

Miklos
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