From a578183ed9dff915878ec6c2b3bf729bf72b9bd1 Mon Sep 17 00:00:00 2001 From: Guoqing Jiang Date: Mon, 2 May 2016 11:33:14 -0400 Subject: [PATCH] md-cluster: wakeup thread if activated a spare disk When a device is re-added, it will ultimately need to be activated and that happens in md_check_recovery, so we need to set MD_RECOVERY_NEEDED right after remove_and_add_spares. A specifical issue without the change is that when one node perform fail/remove/readd on a disk, but slave nodes could not add the disk back to array as expected (added as missed instead of in sync). So give slave nodes a chance to do resync. Reviewed-by: NeilBrown Signed-off-by: Guoqing Jiang Signed-off-by: Shaohua Li --- drivers/md/md.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/md/md.c b/drivers/md/md.c index 8cc4bbcf9bf8..06f6e81f1516 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8694,6 +8694,11 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) ret = remove_and_add_spares(mddev, rdev2); pr_info("Activated spare: %s\n", bdevname(rdev2->bdev,b)); + /* wakeup mddev->thread here, so array could + * perform resync with the new activated disk */ + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } /* device faulty * We just want to do the minimum to mark the disk -- 2.45.2