Konstantin Belousov f7af6e5e54 nullfs: provide custom bypass for VOP_READ_PGCACHE().
Normal bypass expects locked vnode, which is not true for
VOP_READ_PGCACHE().  Ensure liveness of the lower vnode by taking the
upper vnode interlock, which is also taked by null_reclaim() when
setting v_data to NULL.

Reported and tested by:	pho
Reviewed by:	markj, mjg
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D27327
2020-11-26 18:16:32 +00:00
..
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