[PATCH v11 02/13] copy-on-read: add filter append/drop functions

[Max Reitz]

On 12.10.20 19:43, Andrey Shinkevich wrote:
> Provide API for the COR-filter insertion/removal.
> Also, drop the filter child permissions for an inactive state when the
> filter node is being removed.
> 
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich at virtuozzo.com>
> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov at virtuozzo.com>
> ---
>  block/copy-on-read.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  block/copy-on-read.h | 35 +++++++++++++++++++++
>  2 files changed, 123 insertions(+)
>  create mode 100644 block/copy-on-read.h
> 
> diff --git a/block/copy-on-read.c b/block/copy-on-read.c
> index cb03e0f..bcccf0f 100644
> --- a/block/copy-on-read.c
> +++ b/block/copy-on-read.c

[...]

> @@ -159,4 +188,63 @@ static void bdrv_copy_on_read_init(void)
>      bdrv_register(&bdrv_copy_on_read);
>  }
>  
> +
> +BlockDriverState *bdrv_cor_filter_append(BlockDriverState *bs,
> +                                         QDict *node_options,
> +                                         int flags, Error **errp)

I had hoped you could make this a generic block layer function. :(

(Because it really is rather generic)

*shrug*

Reviewed-by: Max Reitz <mreitz at redhat.com>

> +{
> +    BlockDriverState *cor_filter_bs;
> +    Error *local_err = NULL;
> +
> +    cor_filter_bs = bdrv_open(NULL, NULL, node_options, flags, errp);
> +    if (cor_filter_bs == NULL) {
> +        error_prepend(errp, "Could not create COR-filter node: ");
> +        return NULL;
> +    }
> +
> +    if (!qdict_get_try_str(node_options, "node-name")) {
> +        cor_filter_bs->implicit = true;
> +    }
> +
> +    bdrv_drained_begin(bs);
> +    bdrv_replace_node(bs, cor_filter_bs, &local_err);
> +    bdrv_drained_end(bs);
> +
> +    if (local_err) {
> +        bdrv_unref(cor_filter_bs);
> +        error_propagate(errp, local_err);
> +        return NULL;
> +    }
> +
> +    return cor_filter_bs;
> +}

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