Count dirty blocks and expose an API to get dirty count

This will manage dirty counter for each device and will allow to get the
dirty counter from above.

Signed-off-by: Liran Schour <lirans@il.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/block_int.h b/block_int.h
index a0ebd90a0b..223a437b6a 100644
--- a/block_int.h
+++ b/block_int.h
@@ -175,6 +175,7 @@ struct BlockDriverState {
     int type;
     char device_name[32];
     unsigned long *dirty_bitmap;
+    int64_t dirty_count;
     BlockDriverState *next;
     void *private;
 };