From 9a06ae7b35f4355e7be14b5fae2865b85fc60fc2 Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Thu, 4 Jun 2015 08:45:22 +0200
Subject: [PATCH] libdm: better debug message

Print reason for failing ioctl if thin pool message fails.
---
 WHATS_NEW_DM          | 1 +
 libdm/libdm-deptree.c | 8 +++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index 724b1c7dd..dda2777e9 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.99 - 
 ================================
+  Enhance error message when thin-pool message fails.
 
 Version 1.02.98 - 12th June 2015
 ================================
diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c
index 578f64597..1602c6207 100644
--- a/libdm/libdm-deptree.c
+++ b/libdm/libdm-deptree.c
@@ -1506,11 +1506,13 @@ static int _thin_pool_node_message(struct dm_tree_node *dnode, struct thin_messa
 	if (!dm_task_set_message(dmt, buf))
 		goto_out;
 
-        /* Internal functionality of dm_task */
+	/* Internal functionality of dm_task */
 	dmt->expected_errno = tm->expected_errno;
 
-	if (!dm_task_run(dmt))
-		goto_out;
+	if (!dm_task_run(dmt)) {
+		log_error("Failed to process thin pool message \"%s\".", buf);
+		goto out;
+	}
 
 	r = 1;
 out: