--- sys/sys/vnioctl.h	Fri Sep 17 09:33:58 1999
+++ sys/sys/vnioctl.h	Thu Jul 26 20:39:28 2001
@@ -75,5 +75,6 @@
 #define VN_IO		0x8	/* Debug I/O in vn driver */
 #define VN_DONTCLUSTER	0x10	/* Don't cluster */
 #define VN_RESERVE	0x20	/* Pre-reserve swap */
+#define VN_CDROM	0x40	/* Emulate some CDROM's ioctl */
 
 #endif	/* _SYS_VNIOCTL_H_*/
--- sys/dev/vn/vn.c	Thu Jul 26 19:51:54 2001
+++ sys/dev/vn/vn.c	Fri Jul 27 14:59:31 2001
@@ -77,6 +77,7 @@
 #include <sys/conf.h>
 #include <sys/module.h>
 #include <sys/vnioctl.h>
+#include <sys/cdio.h>
 
 #include <vm/vm.h>
 #include <vm/vm_object.h>
@@ -419,6 +420,109 @@
 	}
 }
 
+static __inline void
+lba2msf(u_int32_t lba, u_int8_t *m, u_int8_t *s, u_int8_t *f)
+{
+    lba += 150;
+    lba &= 0xffffff;
+    *m = lba / (60 * 75);
+    lba %= (60 * 75);
+    *s = lba / 75;
+    *f = lba % 75;
+}
+
+static  int
+cdioctl(struct vn_softc *vn, u_long cmd, caddr_t data)
+{
+	switch (cmd) {
+
+	/* VMWare uses CDIOCGETVOL ioctl to check CDROM drive */
+	case CDIOCGETVOL: {
+		struct ioc_vol *vol = (struct ioc_vol *)data;
+		vol->vol[0] = 0;
+		vol->vol[1] = 0;
+		vol->vol[2] = 0;
+		vol->vol[3] = 0;
+		return(0);
+	}
+
+	/* ISO images must have only one track */
+	case CDIOREADTOCHEADER: {
+		struct ioc_toc_header *toc = (struct ioc_toc_header *)data;
+		toc->len = 18;
+		toc->starting_track = 1;
+		toc->ending_track = 1;
+		return(0);
+	}
+
+	case CDIOREADTOCENTRY: {
+		struct ioc_read_toc_single_entry *te =
+				(struct ioc_read_toc_single_entry *)data;
+		struct cd_toc_entry *e = &te->entry;
+
+		IFOPT(vn, VN_FOLLOW) {
+			printf("vnioctl: read_toc_entry %d, %d\n",
+				te->address_format, te->track);
+		}
+
+		if (te->track != 0 && te->track != 1 && te->track != 170)
+			return(EINVAL);
+
+		bzero(e, sizeof(struct cd_toc_entry));
+
+		e->control = 4;		/* data track, copy protected */
+		e->addr_type = CD_CURRENT_POSITION;
+
+		if (te->track == 0 || te->track == 1) {
+			e->track = 1;
+
+			if (te->address_format == CD_MSF_FORMAT)
+				e->addr.msf.second = 2;
+
+		/* Lead-out, 170, 0xAA */
+		} else if (te->track == 170) {
+			int len = (vn->sc_size * vn->sc_secsize) / 2048;
+			e->track = 170;
+
+			if (te->address_format == CD_MSF_FORMAT)
+				lba2msf(len, &e->addr.msf.minute,
+						&e->addr.msf.second,
+						&e->addr.msf.frame);
+			else
+				e->addr.lba = htonl(len);
+
+		} else {
+			return(EINVAL);
+		}
+
+		return(0);
+	}
+
+        case CDIOCREADSUBCHANNEL: {
+		struct ioc_read_subchannel *sc =
+                                       (struct ioc_read_subchannel *)data;
+
+		bzero(sc->data, sizeof(struct cd_sub_channel_info));
+		sc->data->header.audio_status = CD_AS_NO_STATUS;
+
+		if (sc->address_format == CD_MSF_FORMAT)
+			sc->data->what.position.reladdr.msf.second = 2;
+
+		return(0);
+        }
+
+	case CDIOCALLOW:
+	case CDIOCPREVENT:
+		return(0);
+	}
+
+	IFOPT(vn, VN_FOLLOW) {
+		printf("vnioctl: 0x%lx not implemented\n", cmd);
+	}
+
+	return(ENOTTY);
+}
+
 /* ARGSUSED */
 static	int
 vnioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
@@ -453,6 +557,10 @@
 		if (dkslice(dev) != WHOLE_DISK_SLICE ||
 		    dkpart(dev) != RAW_PART)
 			return (ENOTTY);
+	}
+
+	IFOPT(vn,VN_CDROM) {
+		return(cdioctl(vn, cmd, data));
 	}
 
     vn_specific:
--- usr.sbin/vnconfig/vnconfig.c	Thu Jul 26 20:35:05 2001
+++ usr.sbin/vnconfig/vnconfig.c	Thu Jul 26 20:36:40 2001
@@ -234,6 +234,7 @@
 	char *str;
 	u_long *p;
 {
+	if (!strcmp(str,"cdrom")) { *p |= VN_CDROM; return 0; }
 	if (!strcmp(str,"reserve")) { *p |= VN_RESERVE; return 0; }
 	if (!strcmp(str,"labels")) { *p |= VN_LABELS; return 0; }
 	if (!strcmp(str,"follow")) { *p |= VN_FOLLOW; return 0; }