dm cache: Remove unused dm_cache_size

dm_cache_size() has been unused since the original commit
c6b4fcb ("dm: add cache target")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: Dr. David Alan Gilbert

drivers/md/dm-cache-metadata.c

@@ -1218,15 +1218,6 @@ int dm_cache_load_discards(struct dm_cache_metadata *cmd,
 	return r;
 }
 
-int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result)
-{
-	READ_LOCK(cmd);
-	*result = cmd->cache_blocks;
-	READ_UNLOCK(cmd);
-
-	return 0;
-}
-
 static int __remove(struct dm_cache_metadata *cmd, dm_cblock_t cblock)
 {
 	int r;

drivers/md/dm-cache-metadata.h

@@ -71,7 +71,6 @@ void dm_cache_metadata_close(struct dm_cache_metadata *cmd);
  * origin blocks to map to.
  */
 int dm_cache_resize(struct dm_cache_metadata *cmd, dm_cblock_t new_cache_size);
-int dm_cache_size(struct dm_cache_metadata *cmd, dm_cblock_t *result);
 
 int dm_cache_discard_bitset_resize(struct dm_cache_metadata *cmd,
 				   sector_t discard_block_size,