Assemble: --update=metadata converts v0.90 to v1.0

This allows the smooth conversion of legacy 0.90 arrays
to 1.0 metadata.
Old metadata is likely to remain but will be ignored.
It can be removed with
  mdadm --zero-superblock --metadata=0.90 /dev/whatever

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 10 insertions, 3 deletions

diff --git a/Assemble.c b/Assemble.c
index ab7e249e..7e8cdb4d 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -622,9 +622,10 @@ static int load_devices(struct devs *devices, char *devmap,
 							    ident->uuid_set,
 							    c->homehost);
 			if (err < 0) {
-				pr_err("--update=%s not understood"
-				       " for %s metadata\n",
-				       c->update, tst->ss->name);
+				if (err == -1)
+					pr_err("--update=%s not understood"
+					       " for %s metadata\n",
+					       c->update, tst->ss->name);
 				tst->ss->free_super(tst);
 				free(tst);
 				close(mdfd);
@@ -1665,6 +1666,12 @@ try_again:
 	/* First, fill in the map, so that udev can find our name
 	 * as soon as we become active.
 	 */
+	if (c->update && strcmp(c->update, "metadata")==0) {
+		content->array.major_version = 1;
+		content->array.minor_version = 0;
+		strcpy(content->text_version, "1.0");
+	}
+
 	map_update(&map, fd2devnm(mdfd), content->text_version,
 		   content->uuid, chosen_name);