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Index: sys/geom/nop/g_nop.c
===================================================================
--- sys/geom/nop/g_nop.c
+++ sys/geom/nop/g_nop.c
@@ -97,6 +97,42 @@
g_resize_provider(pp, size);
}
+static int
+g_nop_dumper(void *priv, void *virtual, vm_offset_t physical, off_t offset,
+ size_t length)
+{
+ return (0);
+}
+
+static void
+g_nop_kerneldump(struct bio *bp, struct g_nop_softc *sc)
+{
+ struct g_kerneldump *gkd;
+ struct g_geom *gp;
+ struct g_provider *pp;
+
+ gkd = (struct g_kerneldump *)bp->bio_data;
+ gp = bp->bio_to->geom;
+ g_trace(G_T_TOPOLOGY, "%s(%s, %jd, %jd)", __func__, gp->name,
+ (intmax_t)gkd->offset, (intmax_t)gkd->length);
+
+ pp = LIST_FIRST(&gp->provider);
+
+ gkd->di.dumper = g_nop_dumper;
+ gkd->di.priv = sc;
+ gkd->di.blocksize = pp->sectorsize;
+ gkd->di.maxiosize = DFLTPHYS;
+ gkd->di.mediaoffset = sc->sc_offset + gkd->offset;
+ if (gkd->offset > sc->sc_explicitsize) {
+ g_io_deliver(bp, ENODEV);
+ return;
+ }
+ if ((gkd->offset + gkd->length) > sc->sc_explicitsize)
+ gkd->length = sc->sc_explicitsize - gkd->offset;
+ gkd->di.mediasize = gkd->length;
+ g_io_deliver(bp, 0);
+}
+
static void
g_nop_start(struct bio *bp)
{
@@ -127,11 +163,18 @@
case BIO_GETATTR:
sc->sc_getattrs++;
if (sc->sc_physpath &&
- g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath)) {
- mtx_unlock(&sc->sc_lock);
- return;
- }
- break;
+ g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath))
+ ;
+ else if (strcmp(bp->bio_attribute, "GEOM::kerneldump") == 0)
+ g_nop_kerneldump(bp, sc);
+ else
+ /*
+ * Fallthrough to forwarding the GETATTR down to the
+ * lower level device.
+ */
+ break;
+ mtx_unlock(&sc->sc_lock);
+ return;
case BIO_FLUSH:
sc->sc_flushes++;
break;

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