K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2019-10-06T22:14:32.981924Z
K 7
svn:log
V 333
vfs: add optional root vnode caching

Root vnodes looekd up all the time, e.g. when crossing a mount point.
Currently used routines always perform a costly lookup which can be
trivially avoided.

Reviewed by:	jeff (previous version), kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21646

END