Merge branch 'master' into for-linus

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 826bce7343b..487ecda90ad 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -706,6 +706,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
 
 		if (as->argc < nr_params) {
 			ti->error = "not enough path parameters";
+			r = -EINVAL;
 			goto bad;
 		}
 
@@ -892,6 +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;
 
@@ -1271,6 +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);