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, 2 insertions, 2 deletions

diff --git a/sys/isofs/cd9660/cd9660_node.h b/sys/isofs/cd9660/cd9660_node.h
index 33b208f..46e5446 100644
--- a/sys/isofs/cd9660/cd9660_node.h
+++ b/sys/isofs/cd9660/cd9660_node.h
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)cd9660_node.h	8.6 (Berkeley) 5/14/95
- * $Id: cd9660_node.h,v 1.16 1997/11/18 14:40:34 phk Exp $
+ * $Id: cd9660_node.h,v 1.17 1998/02/03 21:39:30 bde Exp $
  */
 
 /*
@@ -56,7 +56,7 @@ typedef	struct	{
 	uid_t		iso_uid;	/* owner user id */
 	gid_t		iso_gid;	/* owner group id */
 	short		iso_links;	/* links of file */
-	dev_t		iso_rdev;	/* Major/Minor number for special */
+	udev_t		iso_rdev;	/* Major/Minor number for special */
 } ISO_RRIP_INODE;