Re: [Qemu-devel] [PATCH v5 17/22] blkverify: Allow command-line configuration

[Kevin Wolf <kwolf@redhat.com>]

Am 13.12.2013 um 18:10 hat Max Reitz geschrieben:
> Introduce the "test" and "raw" options for specifying images.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block/blkverify.c | 59 ++++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 39 insertions(+), 20 deletions(-)
> 
> diff --git a/block/blkverify.c b/block/blkverify.c
> index c6eb287..8bf81b5 100644
> --- a/block/blkverify.c
> +++ b/block/blkverify.c
> @@ -116,13 +116,46 @@ static QemuOptsList runtime_opts = {
>      },
>  };
>  
> +static int open_image(BlockDriverState **pbs, const char *fname, QDict *options,
> +                      const char *bdref_key, int flags, Error **errp)
> +{
> +    QDict *image_options;
> +    int ret;
> +    char *bdref_key_dot;
> +
> +    bdref_key_dot = g_strdup_printf("%s.", bdref_key);
> +    qdict_extract_subqdict(options, &image_options, bdref_key_dot);
> +    g_free(bdref_key_dot);
> +
> +    if (fname) {
> +        /* If a filename is given, use bdrv_open() in order to use the correct
> +           block driver (instead of just opening the raw image). */
> +
> +        if (qdict_get_try_str(options, bdref_key)) {
> +            error_setg(errp, "Cannot reference an existing block device while "
> +                       "giving a filename");
> +            ret = -EINVAL;
> +            goto fail;
> +        }
> +
> +        *pbs = bdrv_new("");
> +        ret = bdrv_open(*pbs, fname, image_options, flags, NULL, errp);
> +    } else {
> +        ret = bdrv_file_open(pbs, NULL, qdict_get_try_str(options, bdref_key),
> +                             image_options, flags, errp);
> +    }
> +
> +fail:
> +    qdict_del(options, bdref_key);
> +    return ret;
> +}
> +
>  static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
>                            Error **errp)
>  {
>      BDRVBlkverifyState *s = bs->opaque;
>      QemuOpts *opts;
>      Error *local_err = NULL;
> -    const char *filename, *raw;
>      int ret;
>  
>      opts = qemu_opts_create_nofail(&runtime_opts);
> @@ -133,33 +166,19 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
>          goto fail;
>      }
>  
> -    /* Parse the raw image filename */
> -    raw = qemu_opt_get(opts, "x-raw");
> -    if (raw == NULL) {
> -        error_setg(errp, "Could not retrieve raw image filename");
> -        ret = -EINVAL;
> -        goto fail;
> -    }
> -
> -    ret = bdrv_file_open(&bs->file, raw, NULL, NULL, flags, &local_err);
> +    /* Open the raw file */
> +    ret = open_image(&bs->file, qemu_opt_get(opts, "x-raw"), options, "raw",
> +                     flags, &local_err);

This changes the behaviour: We now do format probing, and probably
insert a raw block driver between blkverify and the protocol driver.

If you had a generalised open_image() that is shared with blkdebug, you
could specify no probing here, and enable probing for the main image.

Kevin