bwrite->vn_bwrite and vfree returns error for vn_if

vnode interface conversion

nfs_rename made one line

lint; clean up include directives

VOP_TRUNCATE now takes a cred argument

ensure proper types for local variables and parameters

must have directory vnode as first op;
must convert to proper return value for name lookup when creating

get rid of ufs dependencies; define RPC format of directories

cleanups for new nameidata organization

lookup converted to new form

update from Rick Macklem (including leases)

sillyrename now in nfsnode

reorganization to move ufsmount ops to be vnode ops;
(some ops just added in a skeletal way)

ufs moved down one level

remove machine dependencies

only set SAVENAME on last pathname component

use ni_ptr and ni_namelen to find name to be used instead of ni_dent

redefine sillyrename structure to avoid use of nameidata structure
(thus reducing its allocation size from 512 to 64 bytes)

u_long tl used in place of u_long p;
use prototypes for NFS vnode ops (from specdev.h, fifo.h, and nfsmount.h);
add appropriate proc pointers (eliminating lots of curproc's)

first cut for new proc & user structs (still need to put in new vnode calling
convention): get credentials, etc, via proc; u.u_nd, u.u_spare are gone;
purge user.h; consolidate *nullops()

cache open with O_CREAT when the name already exists

misc fixes plus diskless support from Rick Macklem

first pass at proc reorg; merge *nullops, other cleanups; use correct proc's
credentials in nfs_doio

fixes for multiple calls to namei (for rename in NFS)

fill in b_proc iff proc will wait for operation, so tprintf won't fail;
don't bother having nfs daemon do operation if we're going to block