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block/qapi: Introduce BlockGraphInfo

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Introduce a new QAPI type BlockGraphInfo and an associated
bdrv_query_block_graph_info() function that recursively gathers
BlockNodeInfo objects through a block graph.

A follow-up patch is going to make "qemu-img info" use this to print
information about all nodes that are (usually implicitly) opened for a
given image file.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220620162704.80987-8-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Reitz 2022-06-20 18:26:59 +02:00 • committed by Kevin Wolf
parent 5d8813593f
commit 6cab33997b
3 changed files with 86 additions and 0 deletions
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48
block/qapi.c
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@ -403,6 +403,54 @@ fail:
qapi_free_ImageInfo(info);
}
/**
* bdrv_query_block_graph_info:
* @bs: root node to start from
* @p_info: location to store image information
* @errp: location to store error information
*
* Store image information about the graph starting from @bs in @p_info.
*
* @p_info will be set only on success. On error, store error in @errp.
*/
void bdrv_query_block_graph_info(BlockDriverState *bs,
BlockGraphInfo **p_info,
Error **errp)
{
BlockGraphInfo *info;
BlockChildInfoList **children_list_tail;
BdrvChild *c;
ERRP_GUARD();
info = g_new0(BlockGraphInfo, 1);
bdrv_do_query_node_info(bs, qapi_BlockGraphInfo_base(info), errp);
if (*errp) {
goto fail;
}
children_list_tail = &info->children;
QLIST_FOREACH(c, &bs->children, next) {
BlockChildInfo *c_info;
c_info = g_new0(BlockChildInfo, 1);
QAPI_LIST_APPEND(children_list_tail, c_info);
c_info->name = g_strdup(c->name);
bdrv_query_block_graph_info(c->bs, &c_info->info, errp);
if (*errp) {
goto fail;
}
}
*p_info = info;
return;
fail:
assert(*errp != NULL);
qapi_free_BlockGraphInfo(info);
}
/* @p_info will be set only on success. */
static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info,
Error **errp)