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-rw-r--r--include/block/block.h2
-rw-r--r--include/block/block_int.h1
2 files changed, 3 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h
index 6207ff2cec..f24e1fffe2 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -355,6 +355,8 @@ int64_t bdrv_get_dirty_count(BlockDriverState *bs);
void bdrv_enable_copy_on_read(BlockDriverState *bs);
void bdrv_disable_copy_on_read(BlockDriverState *bs);
+void bdrv_ref(BlockDriverState *bs);
+void bdrv_unref(BlockDriverState *bs);
void bdrv_set_in_use(BlockDriverState *bs, int in_use);
int bdrv_in_use(BlockDriverState *bs);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index c3c9c61fa5..b9212b8331 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -277,6 +277,7 @@ struct BlockDriverState {
BlockDeviceIoStatus iostatus;
char device_name[32];
HBitmap *dirty_bitmap;
+ int refcnt;
int in_use; /* users other than guest access, eg. block migration */
QTAILQ_ENTRY(BlockDriverState) list;