From mboxrd@z Thu Jan  1 00:00:00 1970
From: "J. Bruce Fields" <bfields@fieldses.org>
Subject: Re: [RFC] shared subtrees
Date: Mon, 17 Jan 2005 14:32:06 -0500
Message-ID: <20050117193206.GH24830@fieldses.org>
References: <20050113221851.GI26051@parcelfarce.linux.theplanet.co.uk> <41EC0466.9010509@sun.com> <20050117190028.GF24830@fieldses.org> <41EC1253.8080902@sun.com>
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Cc: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
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To: Mike Waychison <Michael.Waychison@Sun.COM>
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On Mon, Jan 17, 2005 at 02:30:27PM -0500, Mike Waychison wrote:
> Well, if I understand it correctly:
> 
> (assuming /foo is vfsmount A)
> 
> $> mount --make-shared /foo
> 
> will make A->A
> 
> $> mount --bind /foo /foo/bar
> 
> will create a vfsmount B based off A, but because A is in a p-node,
> A->B, B->A.
> 
> Then, we attach B to A in the vfsmount tree, but because A->B in the
> propagation tree, B also gets a vfsmount C added on dentry 'bar'.
> Recurse ad infinitum.
> 
> Make sense?

Yes, but couldn't the whole thing be avoided if we just agreed that the
propagation wasn't set up till after B was attached to A?

--b.