linux-kernel - [PATCH 3.4 044/107] md/raid1: fix test for 'was read error from last working device'.

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Message-Id: <1458115601-5762-44-git-send-email-lizf@kernel.org>
Date:	Wed, 16 Mar 2016 16:05:38 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 044/107] md/raid1: fix test for 'was read error from last working device'.

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

3.4.111-rc1 review patch.  If anyone has any objections, please let me know.

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

commit 34cab6f42003cb06f48f86a86652984dec338ae9 upstream.

When we get a read error from the last working device, we don't
try to repair it, and don't fail the device.  We simple report a
read error to the caller.

However the current test for 'is this the last working device' is
wrong.
When there is only one fully working device, it assumes that a
non-faulty device is that device.  However a spare which is rebuilding
would be non-faulty but so not the only working device.

So change the test from "!Faulty" to "In_sync".  If ->degraded says
there is only one fully working device and this device is in_sync,
this must be the one.

This bug has existed since we allowed read_balance to read from
a recovering spare in v3.0

Reported-and-tested-by: Alexander Lyakas <alex.bolshoy@...il.com>
Fixes: 76073054c95b ("md/raid1: clean up read_balance.")
Signed-off-by: NeilBrown <neilb@...e.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/md/raid1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 75e66c6..27af2f3 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -314,7 +314,7 @@ static void raid1_end_read_request(struct bio *bio, int error)
 		spin_lock_irqsave(&conf->device_lock, flags);
 		if (r1_bio->mddev->degraded == conf->raid_disks ||
 		    (r1_bio->mddev->degraded == conf->raid_disks-1 &&
-		     !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags)))
+		     test_bit(In_sync, &conf->mirrors[mirror].rdev->flags)))
 			uptodate = 1;
 		spin_unlock_irqrestore(&conf->device_lock, flags);
 	}
-- 
1.9.1