v2 review - optimize source code

* code from ctrl.c moved to main.c
* remove params.h
* version.h available only for standalone version

module/Makefile

@@ -6,7 +6,6 @@ include ${M}/Makefile-*
 blksnap-y := 		\
 	cbt_map.o	\
 	chunk.o		\
-	ctrl.o		\
 	diff_io.o	\
 	diff_area.o	\
 	diff_buffer.o	\

module/cbt_map.c

@@ -10,11 +10,13 @@
 #endif
 #include "memory_checker.h"
 #include "cbt_map.h"
-#include "params.h"
 #ifdef STANDALONE_BDEVFILTER
 #include "log.h"
 #endif
 
+extern int tracking_block_minimum_shift;
+extern int tracking_block_maximum_count;
+
 #ifndef HAVE_BDEV_NR_SECTORS
 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
 {

module/chunk.c

@@ -5,7 +5,6 @@
 #include <linux/dm-io.h>
 #include <linux/sched/mm.h>
 #include "memory_checker.h"
-#include "params.h"
 #include "chunk.h"
 #include "diff_io.h"
 #include "diff_buffer.h"
@@ -15,6 +14,8 @@
 #include "log.h"
 #endif
 
+extern int chunk_maximum_in_cache;
+
 #ifdef BLK_SNAP_DEBUG_CHUNK_IO
 DEFINE_MUTEX(logging_lock);
 #endif