cd951a0d8e
vrele is supposed to be called with an unlocked vnode, but this was never asserted for if v_usecount was > 0. For such counts the lock is never touched by the routine. As a result the kernel has several consumers which expect vunref semantics and get away with calling vrele since they happen to never do it when this is the last reference (and for some of them this may happen to be a guarantee). Work around the problem by changing vrele semantics to tolerate being called with a lock. This eliminates a possible bug where the lock is already held and vputx takes it anyway. Reviewed by: kib Tested by: pho Differential Revision: https://reviews.freebsd.org/D23528
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