Last step of splitting up minor and unit numbers: remove minor().

Inside the kernel, the minor() function was responsible for obtaining
the device minor number of a character device. Because we made device
numbers dynamically allocated and independent of the unit number passed
to make_dev() a long time ago, it was actually a misnomer. If you really
want to obtain the device number, you should use dev2udev().

We already converted all the drivers to use dev2unit() to obtain the
device unit number, which is still used by a lot of drivers. I've
noticed not a single driver passes NULL to dev2unit(). Even if they
would, its behaviour would make little sense. This is why I've removed
the NULL check.

Ths commit removes minor(), minor2unit() and unit2minor() from the
kernel. Because there was a naming collision with uminor(), we can
rename umajor() and uminor() back to major() and minor(). This means
that the makedev(3) manual page also applies to kernel space code now.

I suspect umajor() and uminor() isn't used that often in external code,
but to make it easier for other parties to port their code, I've
increased __FreeBSD_version to 800062.

sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c

@@ -494,7 +494,7 @@ zfs_init_fs(zfsvfs_t *zfsvfs, znode_t **zpp)
 static uint64_t
 zfs_expldev(dev_t dev)
 {
-	return (((uint64_t)umajor(dev) << NBITSMINOR64) | uminor(dev));
+	return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev));
 }
 /*
  * Special cmpldev for ZFS private use.

sys/compat/linux/linux_stats.c

@@ -88,7 +88,7 @@ disk_foo(struct somestat *tbuf)
 
 				/* XXX this may not be quite right */
 				/* Map major number to 0 */
-				tbuf.st_dev = uminor(buf->st_dev) & 0xf;
+				tbuf.st_dev = minor(buf->st_dev) & 0xf;
 				tbuf.st_rdev = buf->st_rdev & 0xff;
 			}
 			dev_relthread(dev);
@@ -156,7 +156,7 @@ newstat_copyout(struct stat *buf, void *ubuf)
 	struct l_newstat tbuf;
 
 	bzero(&tbuf, sizeof(tbuf));
-	tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
+	tbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8);
 	tbuf.st_ino = buf->st_ino;
 	tbuf.st_mode = buf->st_mode;
 	tbuf.st_nlink = buf->st_nlink;
@@ -487,7 +487,7 @@ stat64_copyout(struct stat *buf, void *ubuf)
 	struct l_stat64 lbuf;
 
 	bzero(&lbuf, sizeof(lbuf));
-	lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
+	lbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8);
 	lbuf.st_ino = buf->st_ino;
 	lbuf.st_mode = buf->st_mode;
 	lbuf.st_nlink = buf->st_nlink;

sys/compat/svr4/svr4_types.h

@@ -69,13 +69,13 @@ typedef struct timespec  svr4_timestruc_t;
 					      (((y) << 0) & 0x00ff)))
 
 #define svr4_to_bsd_odev_t(d) makedev(svr4_omajor(d), svr4_ominor(d))
-#define bsd_to_svr4_odev_t(d) svr4_omakedev(umajor(d), uminor(d))
+#define bsd_to_svr4_odev_t(d) svr4_omakedev(major(d), minor(d))
 
 #define svr4_major(x)         ((int32_t)((((x) & 0xfffc0000) >> 18)))
 #define svr4_minor(x)         ((int32_t)((((x) & 0x0003ffff) >> 0)))
 #define svr4_makedev(x,y)     ((svr4_dev_t)((((x) << 18) & 0xfffc0000) | \
 					    (((y) << 0) & 0x0003ffff)))
 #define svr4_to_bsd_dev_t(d)  makedev(svr4_major(d), svr4_minor(d))
-#define bsd_to_svr4_dev_t(d)  svr4_makedev(umajor(d), uminor(d))
+#define bsd_to_svr4_dev_t(d)  svr4_makedev(major(d), minor(d))
 
 #endif /* !_SVR4_TYPES_H_ */

sys/dev/xen/blkback/blkback.c

@@ -1135,8 +1135,8 @@ open_device(blkif_t *blkif)
 	}
 	blkif->media_num_sectors = blkif->media_size >> blkif->sector_size_shift;
 
-	blkif->major = umajor(vattr.va_rdev);
+	blkif->major = major(vattr.va_rdev);
-	blkif->minor = uminor(vattr.va_rdev);
+	blkif->minor = minor(vattr.va_rdev);
 
 	DPRINTF("opened dev=%s major=%d minor=%d sector_size=%u media_size=%lld\n",
 			blkif->dev_name, blkif->major, blkif->minor, blkif->sector_size, blkif->media_size);

sys/fs/cd9660/cd9660_rrip.c

@@ -416,9 +416,9 @@ cd9660_rrip_device(p,ana)
 	low  = isonum_733(p->dev_t_low);
 
 	if (high == 0)
-		ana->inop->inode.iso_rdev = makedev(umajor(low), uminor(low));
+		ana->inop->inode.iso_rdev = makedev(major(low), minor(low));
 	else
-		ana->inop->inode.iso_rdev = makedev(high, uminor(low));
+		ana->inop->inode.iso_rdev = makedev(high, minor(low));
 	ana->fields &= ~ISO_SUSP_DEVICE;
 	return ISO_SUSP_DEVICE;
 }

sys/nfs4client/nfs4_subs.c

@@ -668,7 +668,7 @@ nfsm_v4build_create_xx(struct nfs4_compound *cp, struct nfs4_oparg_create *c,
 		nfsm_buildf_xx(mb, bpos, "s", strlen(c->linktext), c->linktext);
 	else if (c->type == NFCHR || c->type == NFBLK)
 		nfsm_buildf_xx(mb, bpos, "uu",
-		    umajor(c->vap->va_rdev), uminor(c->vap->va_rdev));
+		    major(c->vap->va_rdev), minor(c->vap->va_rdev));
 
 	/* Name */
 	nfsm_buildf_xx(mb, bpos, "s", c->namelen, c->name);	

sys/nfsclient/nfs_vnops.c

@@ -1314,8 +1314,8 @@ nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
 		nfsm_v3attrbuild(vap, FALSE);
 		if (vap->va_type == VCHR || vap->va_type == VBLK) {
 			tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
-			*tl++ = txdr_unsigned(umajor(vap->va_rdev));
+			*tl++ = txdr_unsigned(major(vap->va_rdev));
-			*tl = txdr_unsigned(uminor(vap->va_rdev));
+			*tl = txdr_unsigned(minor(vap->va_rdev));
 		}
 	} else {
 		sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);

sys/nfsserver/nfs_srvsubs.c

@@ -1057,8 +1057,8 @@ nfsm_srvfattr(struct nfsrv_descript *nfsd, struct vattr *vap,
 		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(umajor(vap->va_rdev));
+		fp->fa3_rdev.specdata1 = txdr_unsigned(major(vap->va_rdev));
-		fp->fa3_rdev.specdata2 = txdr_unsigned(uminor(vap->va_rdev));
+		fp->fa3_rdev.specdata2 = txdr_unsigned(minor(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;

sys/sys/conf.h

@@ -274,10 +274,7 @@ void	dev_lock(void);
 void	dev_unlock(void);
 void	setconf(void);
 
-#define	dev2unit(d)	((d) ? (d)->si_drv0 : NODEV)
+#define	dev2unit(d)	((d)->si_drv0)
-#define	minor(d)	((d) ? (d)->si_drv0 : NODEV)
-#define	unit2minor(u)	(u)
-#define	minor2unit(m)	(m)
 
 typedef	void (*cdevpriv_dtr_t)(void *data);
 int	devfs_get_cdevpriv(void **datap);

sys/sys/param.h

@@ -57,7 +57,7 @@
  *		is created, otherwise 1.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 800061	/* Master, propagated to newvers */
+#define __FreeBSD_version 800062	/* Master, propagated to newvers */
 
 #ifndef LOCORE
 #include <sys/types.h>

sys/sys/types.h

@@ -317,17 +317,9 @@ typedef	struct vm_page	*vm_page_t;
  * minor() gives a cookie instead of an index since we don't want to
  * change the meanings of bits 0-15 or waste time and space shifting
  * bits 16-31 for devices that don't use them.
- *
- * XXX: In the kernel we must name it umajor() and uminor(), because
- * minor() is still in use by <sys/conf.h>.
  */
-#ifdef _KERNEL
-#define	umajor(x)	((int)(((u_int)(x) >> 8)&0xff)) /* major number */
-#define	uminor(x)	((int)((x)&0xffff00ff))		/* minor number */
-#else /* !_KERNEL */
 #define	major(x)	((int)(((u_int)(x) >> 8)&0xff))	/* major number */
 #define	minor(x)	((int)((x)&0xffff00ff))		/* minor number */
-#endif /* _KERNEL */
 #define	makedev(x,y)	((dev_t)(((x) << 8) | (y)))	/* create dev_t */
 
 /*