From: Mikulas Patocka <[email-masked]>

Break the function set_chunk_size to two functions in preparation for
the fix in the following patch.

Cc: [email-masked]
Signed-off-by: Mikulas Patocka <[email-masked]>
Signed-off-by: Alasdair G Kergon <[email-masked]>

---
 drivers/md/dm-exception-store.c |    8 ++++++++
 drivers/md/dm-exception-store.h |    4 ++++
 2 files changed, 12 insertions(+)

Index: linux-2.6.31-rc8/drivers/md/dm-exception-store.c
===================================================================
--- linux-2.6.31-rc8.orig/drivers/md/dm-exception-store.c
+++ linux-2.6.31-rc8/drivers/md/dm-exception-store.c
@@ -171,6 +171,14 @@ static int set_chunk_size(struct dm_exce
 	 */
 	chunk_size_ulong = round_up(chunk_size_ulong, PAGE_SIZE >> 9);
 
+	return dm_exception_store_set_chunk_size(store, chunk_size_ulong,
+						 error);
+}
+
+int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
+				      unsigned long chunk_size_ulong,
+				      char **error)
+{
 	/* Check chunk_size is a power of 2 */
 	if (!is_power_of_2(chunk_size_ulong)) {
 		*error = "Chunk size is not a power of 2";
Index: linux-2.6.31-rc8/drivers/md/dm-exception-store.h
===================================================================
--- linux-2.6.31-rc8.orig/drivers/md/dm-exception-store.h
+++ linux-2.6.31-rc8/drivers/md/dm-exception-store.h
@@ -168,6 +168,10 @@ static inline chunk_t sector_to_chunk(st
 int dm_exception_store_type_register(struct dm_exception_store_type *type);
 int dm_exception_store_type_unregister(struct dm_exception_store_type *type);
 
+int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
+				      unsigned long chunk_size_ulong,
+				      char **error);
+
 int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
 			      unsigned *args_used,
 			      struct dm_exception_store **store);