From: Song Liu <songliubraving@fb.com>
Date: Fri, 9 Oct 2015 04:54:11 +0000 (-0700)
Subject: MD: kick out journal disk if it's not fresh
X-Git-Tag: firefly_0821_release~176^2~806^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a3dfbdaadba2612faf11f025b8156c36e3700247;p=firefly-linux-kernel-4.4.55.git

MD: kick out journal disk if it's not fresh

When journal disk is faulty and we are reassemabling the raid array, the
journal disk is old. We don't allow the journal disk added to the raid
array. Since journal disk is missing in the array, the raid5 will mark
the array readonly.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index bca859a6e3fd..f67cd5b68771 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1608,7 +1608,8 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 		++ev1;
 		if (rdev->desc_nr >= 0 &&
 		    rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
-		    le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX)
+		    (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX ||
+		     le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))
 			if (ev1 < mddev->events)
 				return -EINVAL;
 	} else if (mddev->bitmap) {