linux-kernel - Re: Heads up on VFS based union mount

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Message-ID: <Pine.LNX.4.61.0703302103110.31834@yvahk01.tjqt.qr>
Date:	Fri, 30 Mar 2007 21:04:16 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
cc:	linux-kernel@...r.kernel.org, jblunck@...e.de
Subject: Re: Heads up on VFS based union mount


On Mar 30 2007 15:38, Bharata B Rao wrote:
>
>In union mount approach we maintain this stacking information in the 
>dentry structure. When a filesytem is union mounted on a mountpoint, 
>the dentry of the mount root would hold a reference to the mountpoint 
>dentry as an overlaid dentry and these two dentries together form a 
>union stack. Any subsequent readdir operation on this union mounted 
>dentry would work on the overlaid dentry also thereby providing the 
>merged view of the two filesystems.

What about whiteouts? (I cannot remember whether Jan Blunk's paper 
mentioned it at all.)



Jan
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