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block/vmdk: Fix the endian problem of buf_len and lba

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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-stable@nongnu.org
Signed-off-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20161216052040.53067-2-haoqf@linux.vnet.ibm.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
QingFeng Hao 2016-12-16 06:20:40 +01:00 committed by Max Reitz
parent 36bd422812
commit 4545d4f4af
1 changed files with 2 additions and 2 deletions
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4
block/vmdk.c
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@ -1361,8 +1361,8 @@ 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) {