protect flag manipulation; cleanup of bufinit

breada gets generalized to breadn

add lfs_flush routine, just a hack until Kirk's done

lint

include proper copyright header

new copyright; att/bsd/shared

update from Rick Macklem for race condition in NFS

move bufinit here from init_main.c

more uncontaminated code from vfs_bio.c to vfs_subr.c

lint; when sync'ing, skip vnodes that are locked

add proc pointers to appropriate VOP operations

expunge user.h, other unneeded headers

more-or-less working with new proc & user structs

misc fixes plus diskless support from Rick Macklem

cleanup comments to reflect reality; minor code cleanups; lint

eliminate reallocbuf; merge in ufs_machdep.c

new copyright notice

get rid of historic (unnecessary) code

have to check that vnode is still associated with mount point before using it

mount structure prefixes go from m_ to mnt_ and M_ to MNT_

checks that vfs_busy is being used

break specinfo structure out of vnode.h into specdev.h

missing splbio (from Naomi@osf)

pack now takes a vnode instead of a dev

have to protect count increment with splbio to protect against biodone