Re: [PATCH v2 6/6] tests/9p: Test `Tsetattr` can truncate unlinked file

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Tuesday, March 11, 2025 6:28:09 PM CET Greg Kurz wrote:
> Enhance the `use-after-unlink` test with a new check for the
> case where the client wants to alter the size of an unlinked
> file for which it still has an active fid.
> 
> Suggested-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
>  tests/qtest/virtio-9p-test.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
> index f515a9bb157b..20c0d744fa56 100644
> --- a/tests/qtest/virtio-9p-test.c
> +++ b/tests/qtest/virtio-9p-test.c
> @@ -736,6 +736,14 @@ static void fs_use_after_unlink(void *obj, void *data,
>          .data = buf
>      }).count;
>      g_assert_cmpint(count, ==, write_count);
> +
> +    /* truncate file to (arbitrarily chosen) size 2001 */
> +    tsetattr({
> +        .client = v9p, .fid = fid_file, .attr = (v9fs_attr) {
> +            .valid = P9_SETATTR_SIZE,
> +            .size = 2001
> +        }
> +     });
>  }
>  
>  static void cleanup_9p_local_driver(void *data)
> 

Ah, I just meant the code snippet as a starting point, like I would have also
checked with a stat() call whether 9p server really did what it promised.

But OK, better some test coverage than nothing. :)

/Christian