radix-tree pagecache for 2.4.19-pre4-ac2

Hi.

I've merged the latest version of the radix-tree pagecache patch into my 2.4.19-pre4-ac2 kernel. The patch includes nearly all the modifications listed in the following message ...

http://asimov.lib.uaa.alaska.edu/linux-kernel/archive/2002-Week-12/0188.html

The radix-tree patch was first merged back at 2.4.19-pre3-ac6, then had a few modifications made to it at the suggestion of one of the initial patch authors. I've been using it since then on my machine without trouble, and know at least one other person has used it successfully. So know it's time to post it to the kernel mailing list and see what happens ...

My thanks to everyone working on the kernel and the authors of the radix-tree pagecache. Enjoy!

They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety.
 -- Benjamin Franklin, Historical Review of Pennsylvania, 1759