Hi QingFeng,
I just have a question that whether the marker->data
need convert?
I've no idea, just suddenly realized this question.
Jing
On 11/26/2016 01:46 PM, QingFeng Hao wrote:
The problem was triggered by qemu-iotests case 055. It failed when it
was comparing the compressed vmdk image with original test.img.
The cause is that buf_len in vmdk_write_extent wasn't converted to
little-endian before it was stored to disk. But later vmdk_read_extent
read it and converted it from little-endian to cpu endian.
If the cpu is big-endian like s390, the problem will happen and
the data length read by vmdk_read_extent will become invalid!
The fix is to add the conversion in vmdk_write_extent, meanwhile,
repair the endianness problem of lba field which shall also be converted
to little-endian before storing to disk.
Cc: qemu-sta...@nongnu.org
Signed-off-by: QingFeng Hao <ha...@linux.vnet.ibm.com>
Signed-off-by: Jing Liu <liuj...@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
block/vmdk.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index a11c27a..26e5f95 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1354,8 +1354,8 @@ static int vmdk_write_extent(VmdkExtent *extent, int64_t
cluster_offset,
goto out;
}
- data->lba = offset >> BDRV_SECTOR_BITS;
- data->size = buf_len;
+ data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS);
+ data->size = cpu_to_le32(buf_len);
n_bytes = buf_len + sizeof(VmdkGrainMarker);
iov = (struct iovec) {
