block migration: Cleanup dirty tracking code

This switches the dirty bitmap to a true bitmap, reducing its footprint
(specifically in caches). It moreover fixes off-by-one bugs in
set_dirty_bitmap (nb_sectors+1 were marked) and bdrv_get_dirty (limit
check allowed one sector behind end of drive). And is drops redundant
dirty_tracking field from BlockDriverState.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/block_int.h b/block_int.h
index 7ebe926f5b..907e864101 100644
--- a/block_int.h
+++ b/block_int.h
@@ -168,8 +168,7 @@ struct BlockDriverState {
     int cyls, heads, secs, translation;
     int type;
     char device_name[32];
-    int dirty_tracking;
-    uint8_t *dirty_bitmap;
+    unsigned long *dirty_bitmap;
     BlockDriverState *next;
     void *private;
 };