md: have raid0 report its formation

Report to the user what are the raid zones

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

drivers/md/raid0.c

@@ -52,6 +52,38 @@ static int raid0_congested(void *data, int bits)
 	return ret;
 }
 
+/*
+ * inform the user of the raid configuration
+*/
+static void dump_zones(mddev_t *mddev)
+{
+	int j, k, h;
+	sector_t zone_size = 0;
+	sector_t zone_start = 0;
+	char b[BDEVNAME_SIZE];
+	raid0_conf_t *conf = mddev->private;
+	printk(KERN_INFO "******* %s configuration *********\n",
+		mdname(mddev));
+	h = 0;
+	for (j = 0; j < conf->nr_strip_zones; j++) {
+		printk(KERN_INFO "zone%d=[", j);
+		for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
+			printk("%s/",
+			bdevname(conf->devlist[j*mddev->raid_disks
+						+ k]->bdev, b));
+		printk("]\n");
+
+		zone_size  = conf->strip_zone[j].zone_end - zone_start;
+		printk(KERN_INFO "        zone offset=%llukb "
+				"device offset=%llukb size=%llukb\n",
+			(unsigned long long)zone_start>>1,
+			(unsigned long long)conf->strip_zone[j].dev_start>>1,
+			(unsigned long long)zone_size>>1);
+		zone_start = conf->strip_zone[j].zone_end;
+	}
+	printk(KERN_INFO "**********************************\n\n");
+}
+
 static int create_strip_zones(mddev_t *mddev)
 {
 	int i, c, j, err;
@@ -289,6 +321,7 @@ static int raid0_run(mddev_t *mddev)
 	}
 
 	blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec);
+	dump_zones(mddev);
 	return 0;
 }