[PATCH 3/3] dm: Add a remapping trace to request-based dm

[Jun'ichi Nomura]

Add a remapping trace to request-based dm.

Signed-off-by: Kiyoshi Ueda <k-ueda@xxxxxxxxxxxxx>
Signed-off-by: Jun'ichi Nomura <j-nomura@xxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Alasdair G Kergon <agk@xxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
 drivers/md/dm.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6.31.work/drivers/md/dm.c
===================================================================
--- linux-2.6.31.work.orig/drivers/md/dm.c
+++ linux-2.6.31.work/drivers/md/dm.c
@@ -1503,6 +1503,8 @@ static void map_request(struct dm_target
 		break;
 	case DM_MAPIO_REMAPPED:
 		/* The target has remapped the I/O so dispatch it */
+		trace_block_rq_remap(clone->q, clone, disk_devt(dm_disk(md)),
+				     blk_rq_pos(tio->orig));
 		dm_dispatch_request(clone);
 		break;
 	case DM_MAPIO_REQUEUE:
--
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