releases/2.6.30.7/dm-exception-store-split-set_chunk_size.patch

From 2defcc3fb4661e7351cb2ac48d843efc4c64db13 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 4 Sep 2009 20:40:41 +0100
Subject: dm exception store: split set_chunk_size

From: Mikulas Patocka <mpatocka@redhat.com>

commit 2defcc3fb4661e7351cb2ac48d843efc4c64db13 upstream.

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

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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

--- a/drivers/md/dm-exception-store.c
+++ b/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";
--- a/drivers/md/dm-exception-store.h
+++ b/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);