From 8872ef78ab6d9cadfc9223bc3f3b8a1b86939bbc Mon Sep 17 00:00:00 2001 From: Andrey Shinkevich Date: Wed, 16 Dec 2020 09:16:52 +0300 Subject: [PATCH] block: add API function to insert a node Provide API for insertion a node to backing chain. Suggested-by: Max Reitz Signed-off-by: Andrey Shinkevich Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-Id: <20201216061703.70908-3-vsementsov@virtuozzo.com> Signed-off-by: Max Reitz --- block.c | 25 +++++++++++++++++++++++++ include/block/block.h | 2 ++ 2 files changed, 27 insertions(+) diff --git a/block.c b/block.c index 8b9d457546..91a66d4f3e 100644 --- a/block.c +++ b/block.c @@ -4660,6 +4660,31 @@ static void bdrv_delete(BlockDriverState *bs) g_free(bs); } +BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options, + int flags, Error **errp) +{ + BlockDriverState *new_node_bs; + Error *local_err = NULL; + + new_node_bs = bdrv_open(NULL, NULL, node_options, flags, errp); + if (new_node_bs == NULL) { + error_prepend(errp, "Could not create node: "); + return NULL; + } + + bdrv_drained_begin(bs); + bdrv_replace_node(bs, new_node_bs, &local_err); + bdrv_drained_end(bs); + + if (local_err) { + bdrv_unref(new_node_bs); + error_propagate(errp, local_err); + return NULL; + } + + return new_node_bs; +} + /* * Run consistency checks on an image * diff --git a/include/block/block.h b/include/block/block.h index a193545b6a..127bdf3392 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -358,6 +358,8 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, Error **errp); void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, Error **errp); +BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options, + int flags, Error **errp); int bdrv_parse_aio(const char *mode, int *flags); int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); -- 2.30.2