Divorce "dev_t" from the "major|minor" bitmap, which is now called

udev_t in the kernel but still called dev_t in userland.

Provide functions to manipulate both types:
        major()         umajor()
        minor()         uminor()
        makedev()       umakedev()
        dev2udev()      udev2dev()

For now they're functions, they will become in-line functions
after one of the next two steps in this process.

Return major/minor/makedev to macro-hood for userland.

Register a name in cdevsw[] for the "filedescriptor" driver.

In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.

In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits.  This will essentially
replace the current "alias" check code (same buck, bigger bang).

A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference.  If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.

Without DEVT_FASCIST I belive this patch is a no-op.

Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.

Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).

1 files changed, 3 insertions, 2 deletions

diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index 679c7b3..dbb4254 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)kern_proc.c	8.7 (Berkeley) 2/14/95
- * $Id: kern_proc.c,v 1.48 1999/05/03 23:57:21 billf Exp $
+ * $Id: kern_proc.c,v 1.49 1999/05/06 18:12:44 peter Exp $
  */
 
 #include <sys/param.h>
@@ -548,7 +548,8 @@ sysctl_kern_proc SYSCTL_HANDLER_ARGS
 				if ((p->p_flag & P_CONTROLT) == 0 ||
 				    p->p_session == NULL ||
 				    p->p_session->s_ttyp == NULL ||
-				    p->p_session->s_ttyp->t_dev != (dev_t)name[0])
+				    p->p_session->s_ttyp->t_dev != 
+					udev2dev((udev_t)name[0], 0))
 					continue;
 				break;