New qemu-img convert -B option, by Marc Bevand.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4672 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/block.h b/block.h
index b730505..e18f453 100644
--- a/block.h
+++ b/block.h
@@ -99,6 +99,8 @@
 
 /* Ensure contents are flushed to disk.  */
 void bdrv_flush(BlockDriverState *bs);
+int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
+	int *pnum);
 
 #define BDRV_TYPE_HD     0
 #define BDRV_TYPE_CDROM  1