[Qemu-devel] [PATCH v2 1/5] qcow1: Make padding in the header explicit

[Kevin Wolf <kwolf@redhat.com>]

We were relying on all compilers inserting the same padding in the
header struct that is used for the on-disk format. Let's not do that.
Mark the struct as packed and insert an explicit padding field for
compatibility.

Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
---
 block/qcow.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/qcow.c b/block/qcow.c
index 937dd6d..3684794 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -48,9 +48,10 @@ typedef struct QCowHeader {
     uint64_t size; /* in bytes */
     uint8_t cluster_bits;
     uint8_t l2_bits;
+    uint16_t padding;
     uint32_t crypt_method;
     uint64_t l1_table_offset;
-} QCowHeader;
+} QEMU_PACKED QCowHeader;
 
 #define L2_CACHE_SIZE 16
 
-- 
1.8.3.1