dm-mpath: add hw-handler interface

This patch adds a hw-handler interface for request-based
dm-multipath.

Signed-off-by: Kiyoshi Ueda <k-uedact.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomurace.jp.nec.com>
---
 drivers/md/dm-hw-handler.h |    1 +
 1 files changed, 1 insertion(+)

Index: 2.6.25-rc1/drivers/md/dm-hw-handler.h
============================================================
=======
--- 2.6.25-rc1.orig/drivers/md/dm-hw-handler.h
+++ 2.6.25-rc1/drivers/md/dm-hw-handler.h
 -35,6
+35,7  struct hw_handler_type {
 	void (*pg_init) (struct hw_handler *hwh, unsigned
bypassed,
 			 struct dm_path *path);
 	unsigned (*error) (struct hw_handler *hwh, struct bio
*bio);
+	unsigned (*error_rq) (struct hw_handler *hwh, struct
request *rq);
 	int (*status) (struct hw_handler *hwh, status_type_t
type,
 		       char *result, unsigned int maxlen);
 };

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