so I'm trying to use unionfs, cachefs and nfs, as cachefs is 2.6.18-rc5
right now, thats what I'm testing, but I hit an oops.
basically unionfs's lookup does a "lookup_one_len()" on the underlying fs.
lookup_one_len() calls __lookup_hash()
__lookup_hash() is called as "__lookup_hash(&this, base, NULL)"
now that NULL is important. that's the nameidata entry of __lookup_hash()
__lookup_hash() ends up calling the underlying fs's lookup op, i.e.
nfs_lookup()
nfs_lookup() calls nfs_reval_fsid(nd->mnt, dir, &fhandle, &fattr);
see the bug? :)
This doesn't seem like a unionfs bug, as one should be able to call
lookup_one_len() on an NFS fs.
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