CoW optimizations

[Wayne Davison]

On Sun, Jan 04, 2004 at 04:07:10PM -0800, jw schultz wrote:
> Wayne has a patch in CVS to prevent the [copy on write].

FYI, I have noticed that my improvements do not affect the case where
file permissions are not being preserved -- that code path still sets a
bunch of mode values based on local file permissions.  I haven't come up
with a change I like to optimize this (and I may just leave it alone).

..wayne..