Re: Heads up on VFS based union mount

From: Jan Engelhardt
Date: Fri Mar 30 2007 - 15:11:06 EST



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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