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SubjectRe: [PATCH 19/39] union-mount: Implement union lookup
On Sun,  8 Aug 2010, Valerie Aurora wrote:
> Implement unioned directories, whiteouts, and fallthrus in pathname
> lookup routines. do_lookup() and lookup_hash() call lookup_union()
> after looking up the dentry from the top-level file system.
> lookup_union() is centered around __lookup_hash(), which does cached
> and/or real lookups and revalidates each dentry in the union stack.
> XXX - implement negative union cache entries
> XXX - handle different permissions on directories

If process doing the lookup doesn't have write permission on the top
level directory then the lookup will fail. This is not intended, is


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