md: always update level / chunk_size / layout when writing v1.x metadata.

We previously didn't update these fields when writing the metadata
because they could never change.  They can now, so we better write
them.
v0.90 metadata always updated these fields.

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index fccc8343a2501dbb8db452ea9e5469df11ef53e1..aa79d55875f051eacbc24a0fec4ae46e9795549b 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1375,6 +1375,9 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 
        sb->raid_disks = cpu_to_le32(mddev->raid_disks);
        sb->size = cpu_to_le64(mddev->dev_sectors);
+       sb->chunksize = cpu_to_le32(mddev->chunk_size >> 9);
+       sb->level = cpu_to_le32(mddev->level);
+       sb->layout = cpu_to_le32(mddev->layout);
 
        if (mddev->bitmap && mddev->bitmap_file == NULL) {
                sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);