Mateusz Guzik e3c3248cc7 vfs: implement usecount implying holdcnt ... vnodes have 2 reference counts - holdcnt to keep the vnode itself from getting freed and usecount to denote it is actively used. Previously all operations bumping usecount would also bump holdcnt, which is not necessary. We can detect if usecount is already > 1 (in which case holdcnt is also > 1) and utilize it to avoid bumping holdcnt on our own. This saves on atomic ops. Reviewed by: kib Tested by: pho (previous version) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D21471		2019-09-03 15:42:11 +00:00
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common	Revert r351076 and r351074 because of atomic_swap_64 on 32-bit platforms	2019-08-15 15:27:58 +00:00
uts	vfs: implement usecount implying holdcnt	2019-09-03 15:42:11 +00:00
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