Merge tag 'for-4.12/dm-post-merge-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull additional device mapper updates from Mike Snitzer:
 "Here are some changes from Christoph that needed to be rebased ontop
  of changes that were already merged into the device mapper tree. In
  addition, these changes depend on the 'for-4.12/block' changes that
  you've already merged.

   - Cleanups to request-based DM and DM multipath from Christoph that
     prepare for his block core error code type checking improvements"

* tag 'for-4.12/dm-post-merge-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: introduce a new DM_MAPIO_KILL return value
  dm rq: change ->rq_end_io calling conventions
  dm mpath: merge do_end_io into multipath_end_io

1 files changed, 15 insertions, 14 deletions

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index d445b712970b..a48130b90157 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -287,7 +287,7 @@ static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_
 
 static void dm_done(struct request *clone, int error, bool mapped)
 {
-	int r = error;
+	int r = DM_ENDIO_DONE;
 	struct dm_rq_target_io *tio = clone->end_io_data;
 	dm_request_endio_fn rq_end_io = NULL;
 
@@ -298,7 +298,7 @@ static void dm_done(struct request *clone, int error, bool mapped)
 			r = rq_end_io(tio->ti, clone, error, &tio->info);
 	}
 
-	if (unlikely(r == -EREMOTEIO)) {
+	if (unlikely(error == -EREMOTEIO)) {
 		if (req_op(clone) == REQ_OP_WRITE_SAME &&
 		    !clone->q->limits.max_write_same_sectors)
 			disable_write_same(tio->md);
@@ -307,16 +307,19 @@ static void dm_done(struct request *clone, int error, bool mapped)
 			disable_write_zeroes(tio->md);
 	}
 
-	if (r <= 0)
+	switch (r) {
+	case DM_ENDIO_DONE:
 		/* The target wants to complete the I/O */
-		dm_end_request(clone, r);
-	else if (r == DM_ENDIO_INCOMPLETE)
+		dm_end_request(clone, error);
+		break;
+	case DM_ENDIO_INCOMPLETE:
 		/* The target will handle the I/O */
 		return;
-	else if (r == DM_ENDIO_REQUEUE)
+	case DM_ENDIO_REQUEUE:
 		/* The target wants to requeue the I/O */
 		dm_requeue_original_request(tio, false);
-	else {
+		break;
+	default:
 		DMWARN("unimplemented target endio return value: %d", r);
 		BUG();
 	}
@@ -501,14 +504,12 @@ static int map_request(struct dm_rq_target_io *tio)
 		/* The target wants to requeue the I/O after a delay */
 		dm_requeue_original_request(tio, true);
 		break;
-	default:
-		if (r > 0) {
-			DMWARN("unimplemented target map return value: %d", r);
-			BUG();
-		}
-
+	case DM_MAPIO_KILL:
 		/* The target wants to complete the I/O */
-		dm_kill_unmapped_request(rq, r);
+		dm_kill_unmapped_request(rq, -EIO);
+	default:
+		DMWARN("unimplemented target map return value: %d", r);
+		BUG();
 	}
 
 	return r;