linux-kernel - [PATCH] [70/275] md: fix regression with re-adding devices to arrays with no metadata

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Message-Id: <20110330210507.5EBE33E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:05:07 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	neilb@...e.de, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [70/275] md: fix regression with re-adding devices to arrays with no metadata

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

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

commit bf572541ab44240163eaa2d486b06f306a31d45a upstream.

Commit 1a855a0606 (2.6.37-rc4) fixed a problem where devices were
re-added when they shouldn't be but caused a regression in a less
common case that means sometimes devices cannot be re-added when they
should be.

In particular, when re-adding a device to an array without metadata
we should always access the device, but after the above commit we
didn't.

This patch sets the In_sync flag in that case so that the re-add
succeeds.

This patch is suitable for any -stable kernel to which 1a855a0606 was
applied.

Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/md/md.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6.35.y/drivers/md/md.c
===================================================================
--- linux-2.6.35.y.orig/drivers/md/md.c	2011-03-29 22:51:42.038647504 -0700
+++ linux-2.6.35.y/drivers/md/md.c	2011-03-29 23:54:36.691063594 -0700
@@ -5109,9 +5109,10 @@
 		/* set saved_raid_disk if appropriate */
 		if (!mddev->persistent) {
 			if (info->state & (1<<MD_DISK_SYNC)  &&
-			    info->raid_disk < mddev->raid_disks)
+			    info->raid_disk < mddev->raid_disks) {
 				rdev->raid_disk = info->raid_disk;
-			else
+				set_bit(In_sync, &rdev->flags);
+			} else
 				rdev->raid_disk = -1;
 		} else
 			super_types[mddev->major_version].
--
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