[PATCH] implement in-kernel keys & keyring management [try #5]

[David Howells]

I've modified my patch to avoid a locking error that Al Viro pointed out. If
you have two keyrings A and B, if one process tries to link A to B, whilst in
parallel another process tries to link B to A, it could end up creating a
cycle in the graph. I've added code to serialise link calls with respect to
one another to obviate that problem.

It can be found at:

	http://people.redhat.com/~dhowells/keys/keys-268rc2-5.diff.bz2

David.
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