linux-kernel - [PATCH 1/1 V2] dm raid: fix compat

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Date:   Tue, 11 Oct 2016 17:21:48 +0100
From:   Andy Whitcroft <apw@...onical.com>
To:     Heinz Mauelshagen <heinzm@...hat.com>
Cc:     Mike Snitzer <snitzer@...hat.com>, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, dm-devel@...hat.com,
        Shaohua Li <shli@...nel.org>, Alasdair Kergon <agk@...hat.com>
Subject: [PATCH 1/1 V2] dm raid: fix compat_features validation

>From a30fba068e41214cb0ffcb14e68722482765e0c9 Mon Sep 17 00:00:00 2001
From: Andy Whitcroft <apw@...onical.com>
Date: Tue, 11 Oct 2016 15:16:57 +0100

In ecbfb9f118bce4 ("dm raid: add raid level takeover support") a new
compatible feature flag was added.  Validation for these compat_features
was added but this only passes for new raid mappings with this feature
flag.  This causes previously created raid mappings to be failed at
import.

Check compat_features for the only valid combination.

Fixes: ecbfb9f118bce4 ("dm raid: add raid level takeover support")
Signed-off-by: Andy Whitcroft <apw@...onical.com>
---
 drivers/md/dm-raid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

V2: simplify checks as per maintainer.

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 8abde6b..2a39700 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -2258,7 +2258,8 @@ static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
 	if (!mddev->events && super_init_validation(rs, rdev))
 		return -EINVAL;
 
-	if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
+	if (le32_to_cpu(sb->compat_features) &&
+	    le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
 		rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
 		return -EINVAL;
 	}
-- 
2.9.3