From db7d07e14ba4b964f64058e2c3d121d32f8d53c4 Mon Sep 17 00:00:00 2001
From: Pavel Zakharov <pavel.zakharov@delphix.com>
Date: Fri, 16 Dec 2016 14:20:15 -0500
Subject: OpenZFS 9191 -  dump vdev tree to zfs_dbgmsg when spa load fails due
 to missing log devices

Add vdev_print_tree() in spa_check_for_missing_logs() when some log
devices are missing to ease debugging

Authored by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://illumos.org/issues/9191
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/c5c02e5
Closes #7531
---
 module/zfs/spa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/module/zfs/spa.c b/module/zfs/spa.c
index 3177f9649..dba6efe7b 100644
--- a/module/zfs/spa.c
+++ b/module/zfs/spa.c
@@ -1888,6 +1888,7 @@ spa_check_for_missing_logs(spa_t *spa)
 
 		if (idx > 0) {
 			spa_load_failed(spa, "some log devices are missing");
+			vdev_dbgmsg_print_tree(rvd, 2);
 			return (SET_ERROR(ENXIO));
 		}
 	} else {
@@ -1899,6 +1900,7 @@ spa_check_for_missing_logs(spa_t *spa)
 				spa_set_log_state(spa, SPA_LOG_CLEAR);
 				spa_load_note(spa, "some log devices are "
 				    "missing, ZIL is dropped.");
+				vdev_dbgmsg_print_tree(rvd, 2);
 				break;
 			}
 		}
-- 
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