merge vfs_lock and vfs_busy; interlock mount points properly

doforce is gone

ufs_init moves in from ufs_inode.c

SYNC may be done by anyone; select quota type properly (from karels)

merge ffs_root and lfs_root into ufs_root

add USL's copyright notice

export routines and ufs_mountedon moved to vfs_subr.c.

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

have to call the tree delete function before freeing leaf node

ufs_free_netcred needs a return value

new conventions for calling routing layer

avoid null references (from Torek)

ufs_iput is obsoleted by vput

printing buffer statistics is done in the vfs layer

ensure that correct value is passed

use radix tree code to match exported host addresses rather than adhoc hash code

specdev.h moves to new location

hang_addrlist and free_addrlist move in from nfs/nfs_socket.c

quotactl now takes a real uid_t

reorganization to move ufsmount ops to be vnode ops;
ufs_root, ufs_fhtovp, and ufs_vptofh become filesystem specific

UFS/FFS split for LFS version 1; delete file layout specific routines:
ufs_mountroot, ufs_mount, mountfs, ufs_unmount, ufs_statfs, ufs_sync, sbupdate

rearrange to do getmdev in-line

quotaoff now needs a proc pointer

add global flag to allow forcible unmounts to be attempted;
when syncing, skip vnodes that are locked

enable forcible unmount