can't set this to anything other than zero anyway. Shaves off another
900 bytes. lu_flag's days are numbered now, as are the middle
parameters of RF_CREATE_PARAM3.
out-dated comments, and other unneeded stuff. This helps prepare
for cleaning up the rest of the code, and adding new functionality.
No functional changes to the kernel code in this commit.
Carnegie Mellon University. Full RAID implementation, including
levels 0, 1, 4, 5, 6, parity logging, and a few other goodies.
Ported to NetBSD by Greg Oster.