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 <[email protected]> Reviewed-by: Giuseppe Di Natale <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: John L. Hammond <[email protected]> Closes openzfs#7048
tonyhutter · Mar 8, 2018 · 61be68b · 61be68b
1 parent 6d054f0
commit 61be68b
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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);
 		}