linux-kernel - [PATCH 3.13 130/163] md/raid1: be more cautious where we read-balance during resync.

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Message-Id: <1412888588-26755-131-git-send-email-kamal@canonical.com>
Date:	Thu,  9 Oct 2014 14:02:35 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	NeilBrown <neilb@...e.de>, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 130/163] md/raid1:  be more cautious where we read-balance during resync.

3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit c6d119cf1b5a778e9ed60a006e2a434fcc4471a2 upstream.

commit 79ef3a8aa1cb1523cc231c9a90a278333c21f761 made
it possible for reads to happen concurrently with resync.
This means that we need to be more careful where read_balancing
is allowed during resync - we can no longer be sure that any
resync that has already started will definitely finish.

So keep read_balancing to before recovery_cp, which is conservative
but safe.

This bug makes it possible to read from a device that doesn't
have up-to-date data, so it can cause data corruption.
So it is suitable for any kernel since 3.11.

Fixes: 79ef3a8aa1cb1523cc231c9a90a278333c21f761
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/md/raid1.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index b806da4..e124f01 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -542,11 +542,7 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
 	has_nonrot_disk = 0;
 	choose_next_idle = 0;
 
-	if (conf->mddev->recovery_cp < MaxSector &&
-	    (this_sector + sectors >= conf->next_resync))
-		choose_first = 1;
-	else
-		choose_first = 0;
+	choose_first = (conf->mddev->recovery_cp < this_sector + sectors);
 
 	for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
 		sector_t dist;
-- 
1.9.1

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