MD: fix invalid stored role for a disk - try2

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>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4c1a6ab..5599712 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1766,10 +1766,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
                        } 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)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 78d8307..205f86f 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1725,6 +1725,7 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
         */
        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;
 

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 927b60e..e786546 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1775,6 +1775,7 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
                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