From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 12 Aug 2010 03:14:14 +0000 (+0100)
Subject: dm: error return error for discards
X-Git-Tag: v2.6.36-rc1~51^2~5
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=38e1b257fd7b4f3eee667d29a5e44ec15e253c1c;p=~shefty%2Frdma-dev.git

dm: error return error for discards

Have the error target respond to a discard request with a hard -EIO
rather than fail the request with -EOPNOTSUPP.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 11dea11dc0b..8da366cf381 100644
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -113,6 +113,11 @@ void dm_unregister_target(struct target_type *tt)
  */
 static int io_err_ctr(struct dm_target *tt, unsigned int argc, char **args)
 {
+	/*
+	 * Return error for discards instead of -EOPNOTSUPP
+	 */
+	tt->num_discard_requests = 1;
+
 	return 0;
 }