From 1b604c485c96a4e3bcdcca3998b321c5f7c0d235 Mon Sep 17 00:00:00 2001
From: "John L. Hammond" <35266395+jhammond-intel@users.noreply.github.com>
Date: Wed, 17 Jan 2018 14:24:42 -0600
Subject: [PATCH] Emit an error message before MMP suspends pool

In mmp_thread(), emit an MMP specific error message before calling
zio_suspend() so that the administrator will understand why the pool
is being suspended.

Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Closes #7048
---
 module/zfs/mmp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c
index 6f2aa3f59315..e91ae628ab2e 100644
--- a/module/zfs/mmp.c
+++ b/module/zfs/mmp.c
@@ -26,6 +26,7 @@
 #include <sys/mmp.h>
 #include <sys/spa.h>
 #include <sys/spa_impl.h>
+#include <sys/time.h>
 #include <sys/vdev.h>
 #include <sys/vdev_impl.h>
 #include <sys/zfs_context.h>
@@ -428,6 +429,10 @@ mmp_thread(spa_t *spa)
 		 */
 		if (!suspended && mmp_fail_intervals && multihost &&
 		    (start - mmp->mmp_last_write) > max_fail_ns) {
+			cmn_err(CE_WARN, "MMP writes to pool '%s' have not "
+			    "succeeded in over %llus; suspending pool",
+			    spa_name(spa),
+			    NSEC2SEC(start - mmp->mmp_last_write));
 			zio_suspend(spa, NULL);
 		}