From 6d82f98c3d9f83045a801df60f904421b101faa9 Mon Sep 17 00:00:00 2001
From: Isaac Huang <he.huang@intel.com>
Date: Thu, 23 Feb 2017 11:32:15 -0700
Subject: [PATCH] Fix incorrect spare vdev state after replacing

After a hot spare replaces an OFFLINE vdev, the new
parent spare vdev state is set incorrectly to OFFLINE.
The correct state should be DEGRADED. The incorrect
OFFLINE state will prevent top-level vdev from reading
the spare vdev, thus causing unnecessary reconstruction.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Don Brady <don.brady@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Isaac Huang <he.huang@intel.com>
Closes #5766
Closes #5770
---
 module/zfs/spa.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/module/zfs/spa.c b/module/zfs/spa.c
index a69b8cda81c9..d632d635e916 100644
--- a/module/zfs/spa.c
+++ b/module/zfs/spa.c
@@ -4713,6 +4713,11 @@ spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
 	newvd->vdev_crtxg = oldvd->vdev_crtxg;
 	vdev_add_child(pvd, newvd);
 
+	/*
+	 * Reevaluate the parent vdev state.
+	 */
+	vdev_propagate_state(pvd);
+
 	tvd = newvd->vdev_top;
 	ASSERT(pvd->vdev_top == tvd);
 	ASSERT(tvd->vdev_parent == rvd);