[PATCH] block/vhdx: Support vhdx image only with 512 bytes logical sector size

[Swapnil Ingle]

block/vhdx uses qemu block layer where sector size is always 512 byte.
This may have issues  with 4K logical sector sized vhdx image.

For e.g qemu-img convert on such images fails with following assert:

$qemu-img convert -f vhdx -O raw 4KTest1.vhdx test.raw
qemu-img: util/iov.c:388: qiov_slice: Assertion `offset + len <=
qiov->size' failed.
Aborted

This patch adds an check to return ENOTSUP for vhdx images which
has logical sector size other than 512 bytes.

Signed-off-by: Swapnil Ingle 
---
 block/vhdx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/block/vhdx.c b/block/vhdx.c
index 791eb90..356ec4c 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -816,9 +816,9 @@ static int vhdx_parse_metadata(BlockDriverState *bs, 
BDRVVHDXState *s)
 goto exit;
 }
 
-/* only 2 supported sector sizes */
-if (s->logical_sector_size != 512 && s->logical_sector_size != 4096) {
-ret = -EINVAL;
+/* Currently we only support 512 */
+if (s->logical_sector_size != 512) {
+ret = -ENOTSUP;
 goto exit;
 }
 
-- 
1.8.3.1

Re: [PATCH] block/vhdx: Support vhdx image only with 512 bytes logical sector size

[Philippe Mathieu-Daudé]

On 8/5/20 11:30 PM, Swapnil Ingle wrote:
> block/vhdx uses qemu block layer where sector size is always 512 byte.

"bytes".

> This may have issues  with 4K logical sector sized vhdx image.
> 
> For e.g qemu-img convert on such images fails with following assert:
> 
> $qemu-img convert -f vhdx -O raw 4KTest1.vhdx test.raw
> qemu-img: util/iov.c:388: qiov_slice: Assertion `offset + len <=
> qiov->size' failed.
> Aborted
> 
> This patch adds an check to return ENOTSUP for vhdx images which
> has logical sector size other than 512 bytes.

Probably "which have".

> 
> Signed-off-by: Swapnil Ingle 
> ---
>  block/vhdx.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/block/vhdx.c b/block/vhdx.c
> index 791eb90..356ec4c 100644
> --- a/block/vhdx.c
> +++ b/block/vhdx.c
> @@ -816,9 +816,9 @@ static int vhdx_parse_metadata(BlockDriverState *bs, 
> BDRVVHDXState *s)
>  goto exit;
>  }
>  
> -/* only 2 supported sector sizes */
> -if (s->logical_sector_size != 512 && s->logical_sector_size != 4096) {
> -ret = -EINVAL;
> +/* Currently we only support 512 */
> +if (s->logical_sector_size != 512) {
> +ret = -ENOTSUP;
>  goto exit;
>  }
>  
>