From: NeilBrown <neilb@suse.de>
Date: Wed, 8 Sep 2010 06:48:17 +0000 (+1000)
Subject: md: fix v1.x metadata update when a disk is missing.
X-Git-Tag: v2.6.36-rc5~19^2
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=ddcf3522cf03a147c867a2e0155761652dbd156a;p=~shefty%2Frdma-dev.git

md: fix v1.x metadata update when a disk is missing.

If an array with 1.x metadata is assembled with the last disk missing,
md doesn't properly record the fact that the disk was missing.

This is unlikely to cause a real problem as the event count will be
different to the count on the missing disk so it won't be included in
the array.  However it could still cause confusion.

So make sure we clear all the relevant slots, not just the early ones.

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index bdd9bba577b..f20d13e717d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1643,7 +1643,9 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 		bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
 		if (rdev->sb_size & bmask)
 			rdev->sb_size = (rdev->sb_size | bmask) + 1;
-	}
+	} else
+		max_dev = le32_to_cpu(sb->max_dev);
+
 	for (i=0; i<max_dev;i++)
 		sb->dev_roles[i] = cpu_to_le16(0xfffe);