Create: add support for RAID0 layouts.

Since Linux 5.4 a layout is needed for RAID0 arrays with
varying device sizes.
This patch makes the layout of an array visible (via --examine)
and sets the layout on newly created arrays.
--layout=dangerous
can be used to avoid setting a layout so that they array
can be used on older kernels.

Tested-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/Detail.c b/Detail.c
index 24fa462..832485f 100644
--- a/Detail.c
+++ b/Detail.c
@@ -525,6 +525,11 @@ int Detail(char *dev, struct context *c)
 			printf("            Layout : %s\n",
 			       str ? str : "-unknown-");
 		}
+		if (array.level == 0 && array.layout) {
+			str = map_num(r0layout, array.layout);
+			printf("            Layout : %s\n",
+			       str ? str : "-unknown-");
+		}
 		if (array.level == 6) {
 			str = map_num(r6layout, array.layout);
 			printf("            Layout : %s\n",