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[Qemu-block] [PATCH 8/8] block: Assert !bs->refcnt in bdrv_close()

From: Max Reitz
Subject: [Qemu-block] [PATCH 8/8] block: Assert !bs->refcnt in bdrv_close()
Date: Tue, 10 Nov 2015 04:44:23 +0100

The only caller of bdrv_close() left is bdrv_delete(). We may as well
assert that, in a way (there are some things in bdrv_close() that make
more sense under that assumption, such as the call to
bdrv_release_all_dirty_bitmaps() which in turn assumes that no frozen
bitmaps are attached to the BDS).

In addition, being called only in bdrv_delete() means that we can drop
bdrv_close()'s forward declaration at the top of block.c.

Signed-off-by: Max Reitz <address@hidden>
 block.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block.c b/block.c
index f258c54..0abf80f 100644
--- a/block.c
+++ b/block.c
@@ -95,8 +95,6 @@ static void bdrv_release_all_dirty_bitmaps(BlockDriverState 
 /* If non-zero, use only whitelisted block drivers */
 static int use_bdrv_whitelist;
-static void bdrv_close(BlockDriverState *bs);
 #ifdef _WIN32
 static int is_windows_drive_prefix(const char *filename)
@@ -1872,6 +1870,7 @@ static void bdrv_close(BlockDriverState *bs)
     BdrvAioNotifier *ban, *ban_next;
+    assert(!bs->refcnt);
     /* Disable I/O limits and drain all pending throttled requests */
     if (bs->throttle_state) {

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