Add g_duplicate_bio() function which does the same thing what g_clone_bio()

is doing, but g_duplicate_bio() allocates new bio with M_WAITOK flag.

2 files changed, 26 insertions, 0 deletions

diff --git a/sys/geom/geom.h b/sys/geom/geom.h
index 79a2e3b..c3863c5 100644
--- a/sys/geom/geom.h
+++ b/sys/geom/geom.h
@@ -262,6 +262,7 @@ int g_modevent(module_t, int, void *);
 
 /* geom_io.c */
 struct bio * g_clone_bio(struct bio *);
+struct bio * g_duplicate_bio(struct bio *);
 void g_destroy_bio(struct bio *);
 void g_io_deliver(struct bio *bp, int error);
 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
diff --git a/sys/geom/geom_io.c b/sys/geom/geom_io.c
index 77f446c..c95dbf8 100644
--- a/sys/geom/geom_io.c
+++ b/sys/geom/geom_io.c
@@ -186,6 +186,31 @@ g_clone_bio(struct bio *bp)
 	return(bp2);
 }
 
+struct bio *
+g_duplicate_bio(struct bio *bp)
+{
+	struct bio *bp2;
+
+	bp2 = uma_zalloc(biozone, M_WAITOK | M_ZERO);
+	bp2->bio_parent = bp;
+	bp2->bio_cmd = bp->bio_cmd;
+	bp2->bio_length = bp->bio_length;
+	bp2->bio_offset = bp->bio_offset;
+	bp2->bio_data = bp->bio_data;
+	bp2->bio_attribute = bp->bio_attribute;
+	bp->bio_children++;
+#ifdef KTR
+	if (KTR_COMPILE & KTR_GEOM) {
+		struct stack st;
+
+		CTR2(KTR_GEOM, "g_duplicate_bio(%p): %p", bp, bp2);
+		stack_save(&st);
+		CTRSTACK(KTR_GEOM, &st, 3, 0);
+	}
+#endif
+	return(bp2);
+}
+
 void
 g_io_init()
 {