[dm-devel] [PATCH 4/9] dm snapshot: add get_snapshot_info hook to struct exception_store

[FUJITA Tomonori]

dm-snap can use this interface to get the information of available
snapshots (such as the number of current snapshots) from exception
store code.

Signed-off-by: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
---
 drivers/md/dm-snap.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index 6a8a4d8..8a0ae7f 100644
--- a/drivers/md/dm-snap.h
+++ b/drivers/md/dm-snap.h
@@ -139,6 +139,12 @@ struct exception_store {
 	int (*message)(struct exception_store *store, unsigned argc,
 		       char **argv);
 
+	/*
+	 * get the info about available snapshot
+	 */
+	u32 (*get_snapshot_info)(struct exception_store *store,
+				 unsigned long *map, size_t size);
+
 	struct dm_snapshot *snap;
 	void *context;
 };
-- 
1.5.5.GIT