add definition for ability to produce a backtrace
add simple locking primitives
convert VOP_LOCK to vn_lock; add parameters to VOP_UNLOCK and vget
put in request to unmount all filesystems when rebooting
btodb and dbtob need to work with 64-bit numbers (from karels)
add istty for spec_open
typo
entries_pageable set TRUE for buffer map (set vm_map.c change).
4.4BSD snapshot (revision 8.1); add 1993 to copyright
add cpu_swapin (nothing needed)
add cpu_set_init_frame to initialize init's syscall frame
add iszerodev predicate
changes for 4.4BSD-Lite requested by USL
curpri => curpriority
have to terminate swapdev list with NODEV
indir => syscall; __indir => __syscall
4.4BSD snapshot (revision 8.1)
make tags, links work for 4.4BSD
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