D6400.1777339790.diff
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	Index: sys/geom/geom_disk.h
	===================================================================
	--- sys/geom/geom_disk.h
	+++ sys/geom/geom_disk.h
	@@ -118,6 +118,7 @@
	void disk_media_changed(struct disk *dp, int flag);
	void disk_media_gone(struct disk *dp, int flag);
	int disk_resize(struct disk *dp, int flag);
	+struct disk disk_fetch_by_driver(void sc);

	#define DISK_VERSION_00 0x58561059
	#define DISK_VERSION_01 0x5856105a
	Index: sys/geom/geom_disk.c
	===================================================================
	--- sys/geom/geom_disk.c
	+++ sys/geom/geom_disk.c
	@@ -895,6 +895,35 @@
	return (g_post_event(g_disk_resize, dp, flag, NULL));
	}

	+/*
	+ * This method finds disk by driver softc. For instance, it can be used
	+ * in geom_flashmap callback to calculate end of memory-mapped region.
	+ */
	+struct disk
	+disk_fetch_by_driver(void sc)
	+{
	+ struct g_geom *gp;
	+ struct g_disk_softc *g_sc;
	+ struct disk *disk;
	+
	+ /*
	+ * Iterate over disks and compare d_drv with input parameter @sc
	+ */
	+ LIST_FOREACH(gp, &g_disk_class.geom, geom) {
	+ g_sc = (struct g_disk_softc*)gp->softc;
	+ if (g_sc == NULL)
	+ continue;
	+ disk = g_sc->dp;
	+ if (disk == NULL)
	+ continue;
	+ if(disk->d_drv1 == sc) {
	+ return (disk);
	+ }
	+ }
	+
	+ return (NULL);
	+}
	+
	static void
	g_kern_disks(void *p, int flag __unused)
	{