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 11dea11..8da366c 100644
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -113,6 +113,11 @@
*/
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;
}