Make kernel dumps work with GEOM.

Notice that if the device on which the dump is set is destroyed for
any reason, the dump setting is lost.  This in particular will
happen in the case of spoilage.  For instance if you set dump on
ad0s1b and open ad0 for writing, ad0s* will be spoilt and the dump
setting lost.  See geom(4) for more about spoiling.

Sponsored by: DARPA & NAI Labs.

1 files changed, 20 insertions, 0 deletions

diff --git a/sys/geom/geom_disk.c b/sys/geom/geom_disk.c
index e6a2bcd..6abb492 100644
--- a/sys/geom/geom_disk.c
+++ b/sys/geom/geom_disk.c
@@ -99,6 +99,24 @@ g_disk_access(struct g_provider *pp, int r, int w, int e)
 }
 
 static void
+g_disk_kerneldump(struct bio *bp, struct disk *dp)
+{ 
+	int error;
+	struct g_kerneldump *gkd;
+	struct dumperinfo di;
+
+	gkd = (struct g_kerneldump*)bp->bio_data;
+	printf("Kerneldump off=%lld len=%lld\n", gkd->offset, gkd->length);
+	di.dumper = (dumper_t *)dp->d_devsw->d_dump;
+	di.priv = dp->d_dev;
+	di.blocksize = dp->d_label.d_secsize;
+	di.mediaoffset = gkd->offset;
+	di.mediasize = gkd->length;
+	error = set_dumper(&di);
+	g_io_fail(bp, error);
+}
+
+static void
 g_disk_done(struct bio *bp)
 {
 
@@ -148,6 +166,8 @@ g_disk_start(struct bio *bp)
 			break;
 		else if (g_haveattr_off_t(bp, "GEOM::frontstuff", 0))
 			break;
+		else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
+			g_disk_kerneldump(bp, dp);
 		else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
 		    bp->bio_length == sizeof *gio) {
 			gio = (struct g_ioctl *)bp->bio_data;