From 53d94f83fd05b5a36fdfd66eb0f1985590f00811 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 12 Aug 2010 04:14:32 +0100
Subject: [PATCH] --- yaml --- r: 209175 b: refs/heads/master c:
 959eb4e5592cc0b0b07db0ca30d2b1efd790020f h: refs/heads/master i:   209173:
 e282ccb6e88a7ebef3e2c0bab7893ca37348462b   209171:
 af4cd78b6a816ab02261523d9be172cf7c2b1f18   209167:
 8151a196c21a722bdb557c2a7a68f1bd40da03eb v: v3

---
 [refs]                      |  2 +-
 trunk/drivers/md/dm-mpath.c | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index abc44a4afe31..5f9254dd2962 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7b76ec11fec40203836b488496d2df082d5b2022
+refs/heads/master: 959eb4e5592cc0b0b07db0ca30d2b1efd790020f
diff --git a/trunk/drivers/md/dm-mpath.c b/trunk/drivers/md/dm-mpath.c
index da2223aa727f..487ecda90ad4 100644
--- a/trunk/drivers/md/dm-mpath.c
+++ b/trunk/drivers/md/dm-mpath.c
@@ -893,6 +893,7 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
 	}
 
 	ti->num_flush_requests = 1;
+	ti->num_discard_requests = 1;
 
 	return 0;
 
@@ -1272,6 +1273,15 @@ static int do_end_io(struct multipath *m, struct request *clone,
 	if (error == -EOPNOTSUPP)
 		return error;
 
+	if (clone->cmd_flags & REQ_DISCARD)
+		/*
+		 * Pass all discard request failures up.
+		 * FIXME: only fail_path if the discard failed due to a
+		 * transport problem.  This requires precise understanding
+		 * of the underlying failure (e.g. the SCSI sense).
+		 */
+		return error;
+
 	if (mpio->pgpath)
 		fail_path(mpio->pgpath);