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block: add API function to insert a node 

Provide API for insertion a node to backing chain.

Suggested-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201216061703.70908-3-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
master
Andrey Shinkevich 2020-12-16 09:16:52 +03:00 committed by Max Reitz
parent 1252e03b8e
commit 8872ef78ab
2 changed files with 27 additions and 0 deletions
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25
block.c
View File

@ -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
*

2
include/block/block.h
View File

@ -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);