linux-kernel - Re: [PATCH 0/5] hybrid union filesystem prototype

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Message-ID: <alpine.LNX.2.01.1009231515580.31650@obet.zrqbmnf.qr>
Date:	Thu, 23 Sep 2010 15:18:57 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Neil Brown <neilb@...e.de>
cc:	Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, vaurora@...hat.com,
	viro@...iv.linux.org.uk, jblunck@...e.de, hch@...radead.org
Subject: Re: [PATCH 0/5] hybrid union filesystem prototype


On ??, Miklos Szeredi wrote:
On Thursday 2010-09-02 16:25, Jan Engelhardt wrote:
>>
>>There ought to be a reason that other implementations offer
>>doing multiple branches with a single vfsmount.
>
>overdesign

However, those implementations offer changing the branch configuration
on the fly, e.g. pulling "out" a branch in the middle. With
"two-branches only" overlayfs, a multi-branch layout would be
multiple vfsmounts describable by something like "(((a b) c) d)".
Say you want to remove branch B. (Supposedly) works today in
aufs/unionfs. How do you pull it off with overlayfs? You can't
umount the (a b) vfsmount because it is used by c.
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