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Test what upgrades work when there is another lease already held, in addition to the lease to be upgraded. The summary of the behaviour is this: ------------------------------------- If we have two leases (lease1 and lease2) on the same file, then attempt to upgrade lease1 results in a change if and only if the requested lease state: - is valid, - is strictly a superset of lease1, and - can held together with lease2. In that case, the resuling lease state of the upgraded lease1 is the state requested in the upgrade. lease2 is not broken and remains unchanged. Note that this contrasts the case of directly opening with an initial requested lease state, in which case you get that portion of the requested state that can be shared with the already existing leases (or the states that they get broken to). Signed-off-by: Michael Adam <obnox@samba.org> Reviewed-by: David Disseldorp <ddiss@samba.org> Autobuild-User(master): David Disseldorp <ddiss@samba.org> Autobuild-Date(master): Mon Nov 11 18:04:47 CET 2013 on sn-devel-104