Create: improve messages from validate_geometry.

When validate_geometry finds that we haven't committed to
a metadata yet and that the subdev is a member of 'our'
container, it needs to report any errors it finds as Create()
cannot report them effectively.

So make a slight change to the semantics of the 'verbose' flag
and allow validate_geometry to report if it printed any error
messages.

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

Create.c

@@ -332,15 +332,25 @@ int Create(struct supertype *st, char *mddev,
 			char *name = "default";
 			for(i=0; !st && superlist[i]; i++) {
 				st = superlist[i]->match_metadata_desc(name);
+				if (!st)
+					continue;
 				if (do_default_layout)
 					layout = default_layout(st, level, verbose);
-				if (st && !st->ss->validate_geometry
-					    	(st, level, layout, raiddisks,
-						 &chunk, size*2, dname, &freesize,
-						 verbose > 0)) {
+				switch (st->ss->validate_geometry(
+						st, level, layout, raiddisks,
+						&chunk, size*2, dname, &freesize,
+						verbose > 0)) {
+				case -1: /* Not valid, message printed, and not
+					  * worth checking any further */
+					exit(2);
+					break;
+				case 0: /* Geometry not valid */
 					free(st);
 					st = NULL;
 					chunk = do_default_chunk ? UnSet : chunk;
+					break;
+				case 1:	/* All happy */
+					break;
 				}
 			}
 

mdadm.h

@@ -702,6 +702,12 @@ extern struct superswitch {
 	 * inter-device dependencies, it should record sufficient details
 	 * so these can be validated.
 	 * Both 'size' and '*freesize' are in sectors.  chunk is KiB.
+	 * Return value is:
+	 *  1: everything is OK
+	 *  0: not OK for some reason - if 'verbose', then error was reported.
+	 * -1: st->sb was NULL, 'subdev' is a member of a container of this
+	 *     types, but array is not acceptable for some reason
+	 *     message was reported even if verbose is 0.
 	 */
 	int (*validate_geometry)(struct supertype *st, int level, int layout,
 				 int raiddisks,

super-intel.c

@@ -5369,7 +5369,8 @@ static int validate_geometry_imsm(struct supertype *st, int level, int layout,
 			return validate_geometry_imsm_volume(st, level, layout,
 							     raiddisks, chunk,
 							     size, dev,
-							     freesize, verbose);
+							     freesize, 1)
+				? 1 : -1;
 		}
 	}