[SCSI] return ENOSPC on thin provisioning failure

When the thin provisioning hard threshold is reached we
should return ENOSPC to inform upper layers about this fact.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index 93a18d1..68ce4d5 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2318,6 +2318,9 @@
 		case -ETIMEDOUT:
 			error_type = "timeout";
 			break;
+		case -ENOSPC:
+			error_type = "critical space allocation";
+			break;
 		case -EIO:
 		default:
 			error_type = "I/O";