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, 6 insertions, 6 deletions

diff --git a/sys/nfsserver/nfs_srvsubs.c b/sys/nfsserver/nfs_srvsubs.c
index 03c20ca..9a36211 100644
--- a/sys/nfsserver/nfs_srvsubs.c
+++ b/sys/nfsserver/nfs_srvsubs.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_subs.c  8.8 (Berkeley) 5/22/95
- * $Id: nfs_subs.c,v 1.72 1999/01/27 22:42:27 dillon Exp $
+ * $Id: nfs_subs.c,v 1.73 1999/02/17 13:59:29 bde Exp $
  */
 
 /*
@@ -1260,7 +1260,7 @@ nfs_loadattrcache(vpp, mdp, dposp, vaper)
 	if (v3) {
 		vtyp = nfsv3tov_type(fp->fa_type);
 		vmode = fxdr_unsigned(u_short, fp->fa_mode);
-		rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
+		rdev = umakedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
 			fxdr_unsigned(int, fp->fa3_rdev.specdata2));
 		fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
 	} else {
@@ -1312,7 +1312,7 @@ nfs_loadattrcache(vpp, mdp, dposp, vaper)
 		}
 		if (vp->v_type == VCHR || vp->v_type == VBLK) {
 			vp->v_op = spec_nfsv2nodeop_p;
-			nvp = checkalias(vp, (dev_t)rdev, vp->v_mount);
+			nvp = checkalias(vp, rdev, vp->v_mount);
 			if (nvp) {
 				/*
 				 * Discard unneeded vnode, but save its nfsnode.
@@ -1338,7 +1338,7 @@ nfs_loadattrcache(vpp, mdp, dposp, vaper)
 	vap = &np->n_vattr;
 	vap->va_type = vtyp;
 	vap->va_mode = (vmode & 07777);
-	vap->va_rdev = (dev_t)rdev;
+	vap->va_rdev = rdev;
 	vap->va_mtime = mtime;
 	vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
 	if (v3) {
@@ -1862,8 +1862,8 @@ nfsm_srvfattr(nfsd, vap, fp)
 		fp->fa_mode = vtonfsv3_mode(vap->va_mode);
 		txdr_hyper(&vap->va_size, &fp->fa3_size);
 		txdr_hyper(&vap->va_bytes, &fp->fa3_used);
-		fp->fa3_rdev.specdata1 = txdr_unsigned(major(vap->va_rdev));
-		fp->fa3_rdev.specdata2 = txdr_unsigned(minor(vap->va_rdev));
+		fp->fa3_rdev.specdata1 = txdr_unsigned(umajor(vap->va_rdev));
+		fp->fa3_rdev.specdata2 = txdr_unsigned(uminor(vap->va_rdev));
 		fp->fa3_fsid.nfsuquad[0] = 0;
 		fp->fa3_fsid.nfsuquad[1] = txdr_unsigned(vap->va_fsid);
 		fp->fa3_fileid.nfsuquad[0] = 0;