Re: [Qemu-devel] [PATCH v3 2/6] replication: add shared-disk and shared-disk-id options

[Stefan Hajnoczi]

On Fri, Jan 20, 2017 at 11:47:56AM +0800, zhanghailiang wrote:
> @@ -119,12 +136,31 @@ static int replication_open(BlockDriverState *bs, QDict 
> *options,
>                     "The option mode's value should be primary or secondary");
>          goto fail;
>      }
> +    s->is_shared_disk = qemu_opt_get_bool(opts, REPLICATION_SHARED_DISK,
> +                                          false);
> +    if (s->is_shared_disk && (s->mode == REPLICATION_MODE_PRIMARY)) {
> +        shared_disk_id = qemu_opt_get(opts, REPLICATION_SHARED_DISK_ID);
> +        if (!shared_disk_id) {
> +            error_setg(&local_err, "Missing shared disk blk option");
> +            goto fail;
> +        }
> +        s->shared_disk_id = g_strdup(shared_disk_id);
> +        blk = blk_by_name(s->shared_disk_id);
> +        if (!blk) {
> +            error_setg(&local_err, "There is no %s block", 
> s->shared_disk_id);
> +            goto fail;
> +        }
> +        /* We can't access root member of BlockBackend directly */
> +        tmp_bs = blk_bs(blk);
> +        s->primary_disk = QLIST_FIRST(&tmp_bs->parents);

Why is this necessary?

We already have the BlockBackend for the primary disk.  I'm not sure why
the BdrvChild is needed.

Stefan

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