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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, kernel test robot <rong.a.chen@intel.com>,
        Gioh Kim <gi-oh.kim@profitbricks.com>,
        Guoqing Jiang <gqjiang@suse.com>, Shaohua Li <shli@fb.com>
Subject: [PATCH 4.4 095/160] MD: fix invalid stored role for a disk - try2
Date:   Mon, 19 Nov 2018 17:28:54 +0100
Message-Id: <20181119162640.358782061@linuxfoundation.org>
In-Reply-To: <20181119162630.031306128@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Shaohua Li <shli@fb.com>

commit 9e753ba9b9b405e3902d9f08aec5f2ea58a0c317 upstream.

Commit d595567dc4f0 (MD: fix invalid stored role for a disk) broke linear
hotadd. Let's only fix the role for disks in raid1/10.
Based on Guoqing's original patch.

Reported-by: kernel test robot <rong.a.chen@intel.com>
Cc: Gioh Kim <gi-oh.kim@profitbricks.com>
Cc: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/md.c     |    4 ----
 drivers/md/raid1.c  |    1 +
 drivers/md/raid10.c |    1 +
 3 files changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1670,10 +1670,6 @@ static int super_1_validate(struct mddev
 			} else
 				set_bit(In_sync, &rdev->flags);
 			rdev->raid_disk = role;
-			if (role >= mddev->raid_disks) {
-				rdev->saved_raid_disk = -1;
-				rdev->raid_disk = -1;
-			}
 			break;
 		}
 		if (sb->devflags & WriteMostly1)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1605,6 +1605,7 @@ static int raid1_add_disk(struct mddev *
 	 */
 	if (rdev->saved_raid_disk >= 0 &&
 	    rdev->saved_raid_disk >= first &&
+	    rdev->saved_raid_disk < conf->raid_disks &&
 	    conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
 		first = last = rdev->saved_raid_disk;
 
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1737,6 +1737,7 @@ static int raid10_add_disk(struct mddev
 		first = last = rdev->raid_disk;
 
 	if (rdev->saved_raid_disk >= first &&
+	    rdev->saved_raid_disk < conf->geo.raid_disks &&
 	    conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
 		mirror = rdev->saved_raid_disk;
 	else