Konstantin Belousov 161e9a9736 nullfs: provide custom null_advlock bypass
The advlock VOP takes the vnode unlocked, which makes the normal bypass
function racy.  Same as null_pgcache_read(), nullfs implementation needs
to take interlock and reference lower vnode under it.

Reported and tested by:	pho
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D31310
2021-07-27 19:58:47 +03:00
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