dm exception store: split set_chunk_size

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

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 3710ff8..4c01c75 100644 (file)
--- 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_exception_store *store,
         */
        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";

diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 2442c8c..812c718 100644 (file)
--- 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(struct dm_exception_store *store,
 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);