dm snapshot: add get_snapshot_info hook to struct exception_store
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@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 3d43307..4eefb90 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
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