MFC of 234158:

MFC of 234158:

Export vinactive() from kern/vfs_subr.c (e.g., make it no longer
static and declare its prototype in sys/vnode.h) so that it can be
called from process_deferred_inactive() (in ufs/ffs/ffs_snapshot.c)
instead of the body of vinactive() being cut and pasted into
process_deferred_inactive().

Reviewed by: kib

git-svn-id: svn://svn.freebsd.org/base/stable/8@234474 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f