merge vfs_lock and vfs_busy; interlock mount points properly

convert VOP_LOCK to vn_lock; add parameters to VOP_UNLOCK and vget

return error rather than panic when mountroot fails; use vfs_rootmountalloc

check for forcible unmount at syscall level

change mountlist to CIRCLEQ so we can do unmountall (from mycroft)

check for current nfs_args structure

add vfsconf support

massive update to incorporate version 3 protocol from Rick Macklem

conversion to queue.h list manipulation (from mycroft)

lint

new queue structure; vget now locks optionally

4.4BSD snapshot (revision 8.1); add 1993 to copyright

update for pwd bug from Rick Macklem

in_sockmaskof has gone away; just do right thing for default.

update for 4.4BSD from Rick Macklem

make kernel includes standard

use new queue routines for buffer lists hanging off vnode

rootvp and swapvp now done in ?fs_mountroot

update from Rick Macklem

move common diskless mount code to subroutine; must set time for arp to work;
setup for update mount (incomplete); lint

set mnt_maxsymlinklen to a non-zero value so that COMPAT_43 routines
will know that we are setting the d_type field in directories (and can zero it
for unsuspecting binaries)

new parameters for fhtovp

delete USES; nfs_vget moves from nfs_vnops.c

new parameters to sync plus inline expand mntflushbuf;
drop setgen parameter from fhtovp

use getnewfsid instead of rolling our own