[dm-devel] [PATCH 16/24] dm cache: log error message if dm_kcopyd_copy() fails

[Mike Snitzer]

From: Heinz Mauelshagen <heinzm at redhat.com>

A migration failure should be logged (albeit limited).

Signed-off-by: Heinz Mauelshagen <heinzm at redhat.com>
Signed-off-by: Mike Snitzer <snitzer at redhat.com>
---
 drivers/md/dm-cache-target.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index db27dfa..afeda1b 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -924,8 +924,10 @@ static void issue_copy_real(struct dm_cache_migration *mg)
 		r = dm_kcopyd_copy(cache->copier, &o_region, 1, &c_region, 0, copy_complete, mg);
 	}
 
-	if (r < 0)
+	if (r < 0) {
+		DMERR_LIMIT("issuing migration failed");
 		migration_failure(mg);
+	}
 }
 
 static void avoid_copy(struct dm_cache_migration *mg)
-- 
1.8.1.4