diff --git a/sys/geom/concat/g_concat.c b/sys/geom/concat/g_concat.c
index 8838e1aca7e6..9dae373bffd7 100644
--- a/sys/geom/concat/g_concat.c
+++ b/sys/geom/concat/g_concat.c
@@ -211,6 +211,42 @@ g_concat_access(struct g_provider *pp, int dr, int dw, int de)
 	return (error);
 }
 
+static void
+g_concat_flush(struct g_concat_softc *sc, struct bio *bp)
+{
+	struct bio_queue_head queue;
+	struct g_consumer *cp;
+	struct bio *cbp;
+	u_int no;
+
+	bioq_init(&queue);
+	for (no = 0; no < sc->sc_ndisks; no++) {
+		cbp = g_clone_bio(bp);
+		if (cbp == NULL) {
+			for (cbp = bioq_first(&queue); cbp != NULL;
+			    cbp = bioq_first(&queue)) {
+				bioq_remove(&queue, cbp);
+				g_destroy_bio(cbp);
+			}
+			if (bp->bio_error == 0)
+				bp->bio_error = ENOMEM;
+			g_io_deliver(bp, bp->bio_error);
+			return;
+		}
+		bioq_insert_tail(&queue, cbp);
+		cbp->bio_done = g_std_done;
+		cbp->bio_caller1 = sc->sc_disks[no].d_consumer;
+		cbp->bio_to = sc->sc_disks[no].d_consumer->provider;
+	}
+	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
+		bioq_remove(&queue, cbp);
+		G_CONCAT_LOGREQ(cbp, "Sending request.");
+		cp = cbp->bio_caller1;
+		cbp->bio_caller1 = NULL;
+		g_io_request(cbp, cp);
+	}
+}
+
 static void
 g_concat_start(struct bio *bp)
 {
@@ -240,6 +276,9 @@ g_concat_start(struct bio *bp)
 	case BIO_WRITE:
 	case BIO_DELETE:
 		break;
+	case BIO_FLUSH:
+		g_concat_flush(sc, bp);
+		return;
 	case BIO_GETATTR:
 		/* To which provider it should be delivered? */
 	default:
diff --git a/sys/geom/eli/g_eli.c b/sys/geom/eli/g_eli.c
index 4c58fdd982b0..a1965b80bd85 100644
--- a/sys/geom/eli/g_eli.c
+++ b/sys/geom/eli/g_eli.c
@@ -258,6 +258,7 @@ g_eli_start(struct bio *bp)
 	case BIO_READ:
 	case BIO_WRITE:
 	case BIO_GETATTR:
+	case BIO_FLUSH:
 		break;
 	case BIO_DELETE:
 		/*
@@ -298,6 +299,7 @@ g_eli_start(struct bio *bp)
 		wakeup(sc);
 		break;
 	case BIO_GETATTR:
+	case BIO_FLUSH:
 		cbp->bio_done = g_std_done;
 		cp = LIST_FIRST(&sc->sc_geom->consumer);
 		cbp->bio_to = cp->provider;
diff --git a/sys/geom/geom_slice.c b/sys/geom/geom_slice.c
index 2cf3385085da..c85e4a082b72 100644
--- a/sys/geom/geom_slice.c
+++ b/sys/geom/geom_slice.c
@@ -260,6 +260,8 @@ g_slice_start(struct bio *bp)
 				gkd->length = gsp->slices[idx].length;
 			/* now, pass it on downwards... */
 		}
+		/* FALLTHROUGH */
+	case BIO_FLUSH:
 		bp2 = g_clone_bio(bp);
 		if (bp2 == NULL) {
 			g_io_deliver(bp, ENOMEM);
diff --git a/sys/geom/mirror/g_mirror.c b/sys/geom/mirror/g_mirror.c
index fa956e25fb5b..f03da3bceaa9 100644
--- a/sys/geom/mirror/g_mirror.c
+++ b/sys/geom/mirror/g_mirror.c
@@ -1041,6 +1041,48 @@ g_mirror_kernel_dump(struct bio *bp)
 	    g_mirror_get_diskname(disk));
 }
 
+static void
+g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp)
+{
+	struct bio_queue_head queue;
+	struct g_mirror_disk *disk;
+	struct g_consumer *cp;
+	struct bio *cbp;
+
+	bioq_init(&queue);
+	LIST_FOREACH(disk, &sc->sc_disks, d_next) {
+		if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
+			continue;
+		cbp = g_clone_bio(bp);
+		if (cbp == NULL) {
+			for (cbp = bioq_first(&queue); cbp != NULL;
+			    cbp = bioq_first(&queue)) {
+				bioq_remove(&queue, cbp);
+				g_destroy_bio(cbp);
+			}
+			if (bp->bio_error == 0)
+				bp->bio_error = ENOMEM;
+			g_io_deliver(bp, bp->bio_error);
+			return;
+		}
+		bioq_insert_tail(&queue, cbp);
+		cbp->bio_done = g_std_done;
+		cbp->bio_caller1 = disk;
+		cbp->bio_to = disk->d_consumer->provider;
+	}
+	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
+		bioq_remove(&queue, cbp);
+		G_MIRROR_LOGREQ(3, cbp, "Sending request.");
+		disk = cbp->bio_caller1;
+		cbp->bio_caller1 = NULL;
+		cp = disk->d_consumer;
+		KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
+		    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
+		    cp->acr, cp->acw, cp->ace));
+		g_io_request(cbp, disk->d_consumer);
+	}
+}
+
 static void
 g_mirror_start(struct bio *bp)
 {
@@ -1061,6 +1103,9 @@ g_mirror_start(struct bio *bp)
 	case BIO_WRITE:
 	case BIO_DELETE:
 		break;
+	case BIO_FLUSH:
+		g_mirror_flush(sc, bp);
+		return;
 	case BIO_GETATTR:
 		if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
 			g_mirror_kernel_dump(bp);
diff --git a/sys/geom/raid3/g_raid3.c b/sys/geom/raid3/g_raid3.c
index 66383bc8406c..3cb1c6c37db1 100644
--- a/sys/geom/raid3/g_raid3.c
+++ b/sys/geom/raid3/g_raid3.c
@@ -1369,6 +1369,50 @@ g_raid3_sync_done(struct bio *bp)
 	mtx_unlock(&sc->sc_queue_mtx);
 }
 
+static void
+g_raid3_flush(struct g_raid3_softc *sc, struct bio *bp)
+{
+	struct bio_queue_head queue;
+	struct g_raid3_disk *disk;
+	struct g_consumer *cp;
+	struct bio *cbp;
+	u_int i;
+
+	bioq_init(&queue);
+	for (i = 0; i < sc->sc_ndisks; i++) {
+		disk = &sc->sc_disks[i];
+		if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
+			continue;
+		cbp = g_clone_bio(bp);
+		if (cbp == NULL) {
+			for (cbp = bioq_first(&queue); cbp != NULL;
+			    cbp = bioq_first(&queue)) {
+				bioq_remove(&queue, cbp);
+				g_destroy_bio(cbp);
+			}
+			if (bp->bio_error == 0)
+				bp->bio_error = ENOMEM;
+			g_io_deliver(bp, bp->bio_error);
+			return;
+		}
+		bioq_insert_tail(&queue, cbp);
+		cbp->bio_done = g_std_done;
+		cbp->bio_caller1 = disk;
+		cbp->bio_to = disk->d_consumer->provider;
+	}
+	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
+		bioq_remove(&queue, cbp);
+		G_RAID3_LOGREQ(3, cbp, "Sending request.");
+		disk = cbp->bio_caller1;
+		cbp->bio_caller1 = NULL;
+		cp = disk->d_consumer;
+		KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
+		    ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
+		    cp->acr, cp->acw, cp->ace));
+		g_io_request(cbp, disk->d_consumer);
+	}
+}
+
 static void
 g_raid3_start(struct bio *bp)
 {
@@ -1390,6 +1434,9 @@ g_raid3_start(struct bio *bp)
 	case BIO_WRITE:
 	case BIO_DELETE:
 		break;
+	case BIO_FLUSH:
+		g_raid3_flush(sc, bp);
+		return;
 	case BIO_GETATTR:
 	default:
 		g_io_deliver(bp, EOPNOTSUPP);
diff --git a/sys/geom/stripe/g_stripe.c b/sys/geom/stripe/g_stripe.c
index 4f99ba425b5e..8f8de353fa48 100644
--- a/sys/geom/stripe/g_stripe.c
+++ b/sys/geom/stripe/g_stripe.c
@@ -519,6 +519,42 @@ g_stripe_start_economic(struct bio *bp, u_int no, off_t offset, off_t length)
 	return (error);
 }
 
+static void
+g_stripe_flush(struct g_stripe_softc *sc, struct bio *bp)
+{
+	struct bio_queue_head queue;
+	struct g_consumer *cp;
+	struct bio *cbp;
+	u_int no;
+
+	bioq_init(&queue);
+	for (no = 0; no < sc->sc_ndisks; no++) {
+		cbp = g_clone_bio(bp);
+		if (cbp == NULL) {
+			for (cbp = bioq_first(&queue); cbp != NULL;
+			    cbp = bioq_first(&queue)) {
+				bioq_remove(&queue, cbp);
+				g_destroy_bio(cbp);
+			}
+			if (bp->bio_error == 0)
+				bp->bio_error = ENOMEM;
+			g_io_deliver(bp, bp->bio_error);
+			return;
+		}
+		bioq_insert_tail(&queue, cbp);
+		cbp->bio_done = g_std_done;
+		cbp->bio_caller1 = sc->sc_disks[no];
+		cbp->bio_to = sc->sc_disks[no]->provider;
+	}
+	for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
+		bioq_remove(&queue, cbp);
+		G_STRIPE_LOGREQ(cbp, "Sending request.");
+		cp = cbp->bio_caller1;
+		cbp->bio_caller1 = NULL;
+		g_io_request(cbp, cp);
+	}
+}
+
 static void
 g_stripe_start(struct bio *bp)
 {
@@ -542,10 +578,10 @@ g_stripe_start(struct bio *bp)
 	case BIO_READ:
 	case BIO_WRITE:
 	case BIO_DELETE:
-		/*
-		 * Only those requests are supported.
-		 */
 		break;
+        case BIO_FLUSH:
+                g_stripe_flush(sc, bp);
+                return;
 	case BIO_GETATTR:
 		/* To which provider it should be delivered? */
 	default: