--- zzzz-none-000/linux-3.10.107/drivers/md/persistent-data/dm-block-manager.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/md/persistent-data/dm-block-manager.h	2021-02-04 17:41:59.000000000 +0000
@@ -94,7 +94,7 @@
 			  struct dm_block_validator *v,
 			  struct dm_block **result);
 
-int dm_bm_unlock(struct dm_block *b);
+void dm_bm_unlock(struct dm_block *b);
 
 /*
  * It's a common idiom to have a superblock that should be committed last.
@@ -108,6 +108,11 @@
 int dm_bm_flush(struct dm_block_manager *bm);
 
 /*
+ * Request data is prefetched into the cache.
+ */
+void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b);
+
+/*
  * Switches the bm to a read only mode.  Once read-only mode
  * has been entered the following functions will return -EPERM.
  *
@@ -118,7 +123,9 @@
  * Additionally you should not use dm_bm_unlock_move, however no error will
  * be returned if you do.
  */
+bool dm_bm_is_read_only(struct dm_block_manager *bm);
 void dm_bm_set_read_only(struct dm_block_manager *bm);
+void dm_bm_set_read_write(struct dm_block_manager *bm);
 
 u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor);