Introduce the concept of "magic spaces", and implement them in most of

the relevant classes.

Some methods may implement various "magic spaces", this is reserved
or magic areas on the disk, set a side for various and sundry purposes.
A good example is the BSD disklabel and boot code on i386 which occupies
a total of four magic spaces: boot1, the disklabel, the padding behind
the disklabel and boot2.  The reason we don't simply tell people to
write the appropriate stuff on the underlying device is that (some of)
the magic spaces might be real-time modifiable.  It is for instance
possible to change a disklabel while partitions are open, provided
the open partitions do not get trampled in the process.

Sponsored by:	DARPA & NAI Labs.

1 files changed, 19 insertions, 0 deletions

diff --git a/sys/geom/geom_dump.c b/sys/geom/geom_dump.c
index 619e0ed..dcaee02 100644
--- a/sys/geom/geom_dump.c
+++ b/sys/geom/geom_dump.c
@@ -157,11 +157,30 @@ g_conf_geom(struct sbuf *sb, struct g_geom *gp, struct g_provider *pp, struct g_
 {
 	struct g_consumer *cp2;
 	struct g_provider *pp2;
+	struct g_magicspace *gsp;
+	u_int u;
 
 	sbuf_printf(sb, "    <geom id=\"%p\">\n", gp);
 	sbuf_printf(sb, "      <class ref=\"%p\"/>\n", gp->class);
 	sbuf_printf(sb, "      <name>%s</name>\n", gp->name);
 	sbuf_printf(sb, "      <rank>%d</rank>\n", gp->rank);
+	if (gp->magicspaces) {
+		for (u = 0; u < gp->magicspaces->nmagic; u++) {
+			gsp = &gp->magicspaces->magicspace[u];
+			if (gsp->len == 0 || gsp->name == NULL)
+				continue;
+			sbuf_printf(sb, "      <magicspace>\n");
+			sbuf_printf(sb, "        <name>%.8s</name>\n",
+			    gsp->name);
+			sbuf_printf(sb, "        <offset>%lld</offset>\n",
+			    (long long)gsp->offset);
+			sbuf_printf(sb, "        <length>%u</length>\n",
+			    gsp->len);
+			sbuf_printf(sb, "        <flags>%u</flags>\n",
+			    gsp->flags);
+			sbuf_printf(sb, "      </magicspace>\n");
+		}
+	}
 	if (gp->dumpconf) {
 		sbuf_printf(sb, "      <config>\n");
 		gp->dumpconf(sb, "\t", gp, NULL, NULL);