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

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(a)virtuozzo.com&gt; Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)virtuozzo.com&gt; --- 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)

+{ + 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; +}