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SubjectRe: Heads up on VFS based union mount
On Fri, Mar 30, 2007 at 09:04:16PM +0200, Jan Engelhardt wrote:
>
> 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.)

We do have whiteout support. And as I mentioned earlier, the underlying
filesystem needs to support the new 'whiteout' filetype. As of now it is
supported for ext2, ext3 and ramfs.

Regards,
Bharata.
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