Retire the "frontstuff" record keeping, it was no match for the

in-band meta-data of BSD labels and a more complex solution will be needed.

sys/geom/geom_apple.c

@@ -178,12 +178,6 @@ g_apple_taste(struct g_class *mp, struct g_provider *pp, int insist)
 		if (sectorsize != 512)
 			break;
 
-		/*
-		 * Reserve the driver record. XXX Should the partition
-		 * map be included ?
-		 */
-		gsp->frontstuff = sectorsize;
-
 		buf = g_read_data(cp, 0, sectorsize, &error);
 		if (buf == NULL || error != 0)
 			break;

sys/geom/geom_bsd.c

@@ -462,7 +462,6 @@ g_bsd_try(struct g_geom *gp, struct g_slicer *gsp, struct g_consumer *cp, int se
 
 	/* If we had a label, record it properly. */
 	if (error == 0) {
-		gsp->frontstuff = 16 * secsize;	/* XXX */
 		ms->labeloffset = offset;
 		g_topology_lock();
 		g_slice_conf_hot(gp, 0, offset, g_bsd_ondisk_size());

sys/geom/geom_gpt.c

@@ -209,9 +209,6 @@ g_gpt_taste(struct g_class *mp, struct g_provider *pp, int insist)
 		tblsz = (hdr->hdr_entries * hdr->hdr_entsz + secsz - 1) &
 		    ~(secsz - 1);
 		buf = g_read_data(cp, hdr->hdr_lba_table * secsz, tblsz, &error);
-
-		gsp->frontstuff = hdr->hdr_lba_start * secsz;
-
 		for (i = 0; i < hdr->hdr_entries; i++) {
 			struct uuid unused = GPT_ENT_TYPE_UNUSED;
 			struct uuid freebsd = GPT_ENT_TYPE_FREEBSD;

sys/geom/geom_mbr.c

@@ -297,7 +297,6 @@ g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
 		if (sectorsize < 512)
 			break;
 		ms->sectorsize = sectorsize;
-		gsp->frontstuff = sectorsize * fwsectors;
 		buf = g_read_data(cp, 0, sectorsize, &error);
 		if (buf == NULL || error != 0)
 			break;
@@ -404,7 +403,6 @@ g_mbrext_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
 		sectorsize = cp->provider->sectorsize;
 		if (sectorsize != 512)
 			break;
-		gsp->frontstuff = sectorsize * fwsectors;
 		for (;;) {
 			buf = g_read_data(cp, off, sectorsize, &error);
 			if (buf == NULL || error != 0)

sys/geom/geom_pc98.c

@@ -328,7 +328,6 @@ g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
 		sectorsize = cp->provider->sectorsize;
 		if (sectorsize < 512)
 			break;
-		gsp->frontstuff = sectorsize * fwsectors;
 		buf = g_read_data(cp, 0, 8192, &error);
 		if (buf == NULL || error != 0)
 			break;

sys/geom/geom_slice.c

@@ -220,18 +220,6 @@ g_slice_start(struct bio *bp)
 		/* Give the real method a chance to override */
 		if (gsp->start(bp))
 			return;
-		if (!strcmp("GEOM::frontstuff", bp->bio_attribute)) {
-			t = gsp->cfrontstuff;
-			if (gsp->frontstuff > t)
-				t = gsp->frontstuff;
-			t -= gsl->offset;
-			if (t < 0)
-				t = 0;
-			if (t > gsl->length)
-				t = gsl->length;
-			g_handleattr_off_t(bp, "GEOM::frontstuff", t);
-			return;
-		}
 #ifdef _KERNEL
 		if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) {
 			struct g_kerneldump *gkd;
@@ -269,10 +257,6 @@ g_slice_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct
 		    (uintmax_t)gsp->slices[pp->index].offset);
 		return;
 	}
-	if (gp != NULL && (pp == NULL && cp == NULL)) {
-		sbuf_printf(sb, "%s<frontstuff>%ju</frontstuff>\n",
-		    indent, (intmax_t)gsp->frontstuff);
-	}
 	if (pp != NULL) {
 		sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index);
 		sbuf_printf(sb, "%s<length>%ju</length>\n",
@@ -400,7 +384,7 @@ g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_co
 	struct g_slicer *gsp;
 	struct g_consumer *cp;
 	void **vp;
-	int error, i;
+	int error;
 
 	g_topology_assert();
 	vp = (void **)extrap;
@@ -426,11 +410,6 @@ g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_co
 		g_destroy_geom(gp);
 		return (NULL);
 	}
-	/* Find out if there are any magic bytes on the consumer */
-	i = sizeof gsp->cfrontstuff;
-	error = g_io_getattr("GEOM::frontstuff", cp, &i, &gsp->cfrontstuff);
-	if (error)
-		gsp->cfrontstuff = 0;
 	*vp = gsp->softc;
 	*cpp = cp;
 	return (gp);

sys/geom/geom_slice.h

@@ -51,8 +51,6 @@ struct g_slicer {
 	u_int		nslice;
 	u_int		nprovider;
 	u_int		nhot;
-	off_t		cfrontstuff;
-	off_t		frontstuff;
 	struct g_slice	*slices;
 	struct g_slice	*hot;
 	void		*softc;

sys/geom/geom_sunlabel.c

@@ -174,7 +174,6 @@ g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
 		ms->sectorsize = cp->provider->sectorsize;
 		if (ms->sectorsize < 512)
 			break;
-		gsp->frontstuff = 16 * ms->sectorsize;
 		mediasize = cp->provider->mediasize;
 		buf = g_read_data(cp, 0, ms->sectorsize, &error);
 		if (buf == NULL || error != 0)