lock vnode while computing dircache

convert VOP_LOCK to vn_lock; add parameters to VOP_UNLOCK and vget

messing around with hashing and locking (checked in by mckusick for pendry)

VOP_CLOSE takes four arguments (from mycroft)

fix readdir for no-linear stacks

fix dangling pointer

ensure unlink/rmdir create whiteouts when appropriate

LEASE_CHECK -> VOP_LEASE
fix component length when creating shadow directories/whiteouts.
*** CHANGED *** 94/08/31 05:55:57 pendry
LEASE_CHECK -> VOP_LEASE.

changes for whiteouts and union filesystem

keep track of parent union node, so allowing .. to refer to

keep track of deleted upper layer objects

don't reference lower layer root vnode if it doesn't exist

abstract the copyup function

keep track of vnode size changes.

keep track of whether the union node is cached or not.
this allows anonymous union_node's to be handled correctly.
(an anon node is one with neither an upper or lower layer and comes
into being when

keep track of whether the union node is cached or not.
this allows anonymous union_node's to be handled correctly.
(an anon node is one with neither an upper or lower layer and comes
into being when an existing upper-layer file is deleted.)

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detect root node and set VROOT flag

implement new access policy
fixup locking for UNMNT_BELOW.

fix reference counts in union_vn_create and union_mkshadow

use miscfs include path

up to v8

cleanup & lint

new locking scheme

checkpoint

checkpoint

checkpoint