linux-kernel - [PATCH 2.6.32 21/62] md/raid5: dont record new size if resize

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Date:	Sun, 13 Sep 2015 00:56:27 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	NeilBrown <neilb@...e.de>, Ben Hutchings <ben@...adent.org.uk>,
	Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 21/62] md/raid5: dont record new size if resize_stripes
 fails.

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: NeilBrown <neilb@...e.de>

commit 6e9eac2dcee5e19f125967dd2be3e36558c42fff upstream.

If any memory allocation in resize_stripes fails we will return
-ENOMEM, but in some cases we update conf->pool_size anyway.

This means that if we try again, the allocations will be assumed
to be larger than they are, and badness results.

So only update pool_size if there is no error.

This bug was introduced in 2.6.17 and the patch is suitable for
-stable.

Fixes: ad01c9e3752f ("[PATCH] md: Allow stripes to be expanded in preparation for expanding an array")
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit c20694a054e903745591f4f85b39ecbce4e58349)

Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/md/raid5.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 4d70eef..7eb8b46 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1452,7 +1452,8 @@ static int resize_stripes(raid5_conf_t *conf, int newsize)
 
 	conf->slab_cache = sc;
 	conf->active_name = 1-conf->active_name;
-	conf->pool_size = newsize;
+	if (!err)
+		conf->pool_size = newsize;
 	return err;
 }
 
-- 
1.7.12.2.21.g234cd45.dirty



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