From 1c02e2a17104fe7fc11893125864dc0daf1e6d5b Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 28 Oct 2010 16:16:00 +0200
Subject: qcow2: Invalidate cache after failed read

The cache content may be destroyed after a failed read, better not use it any
more.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 block/qcow2-refcount.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'block/qcow2-refcount.c')

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 0efb676..a10453c 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -103,6 +103,7 @@ static int load_refcount_block(BlockDriverState *bs,
     ret = bdrv_pread(bs->file, refcount_block_offset, s->refcount_block_cache,
                      s->cluster_size);
     if (ret < 0) {
+        s->refcount_block_cache_offset = 0;
         return ret;
     }
 
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