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[PATCH v2 07/12] block/qapi: Introduce BlockGraphInfo
From: |
Hanna Reitz |
Subject: |
[PATCH v2 07/12] block/qapi: Introduce BlockGraphInfo |
Date: |
Mon, 20 Jun 2022 18:26:59 +0200 |
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>
---
qapi/block-core.json | 35 ++++++++++++++++++++++++++++++++
include/block/qapi.h | 3 +++
block/qapi.c | 48 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 86 insertions(+)
diff --git a/qapi/block-core.json b/qapi/block-core.json
index d5d1c8ff15..b7e5708487 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -307,6 +307,41 @@
'*backing-image': 'ImageInfo'
} }
+##
+# @BlockChildInfo:
+#
+# Information about all nodes in the block graph starting at some node,
+# annotated with information about that node in relation to its parent.
+#
+# @name: Child name of the root node in the BlockGraphInfo struct, in its role
+# as the child of some undescribed parent node
+#
+# @info: Block graph information starting at this node
+#
+# Since: 7.1
+##
+{ 'struct': 'BlockChildInfo',
+ 'data': {
+ 'name': 'str',
+ 'info': 'BlockGraphInfo'
+ } }
+
+##
+# @BlockGraphInfo:
+#
+# Information about all nodes in a block (sub)graph in the form of
BlockNodeInfo
+# data.
+# The base BlockNodeInfo struct contains the information for the (sub)graph's
+# root node.
+#
+# @children: Array of links to this node's child nodes' information
+#
+# Since: 7.1
+##
+{ 'struct': 'BlockGraphInfo',
+ 'base': 'BlockNodeInfo',
+ 'data': { 'children': ['BlockChildInfo'] } }
+
##
# @ImageCheck:
#
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 2174bf8fa2..196436020e 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -43,6 +43,9 @@ void bdrv_query_image_info(BlockDriverState *bs,
bool flat,
bool skip_implicit_filters,
Error **errp);
+void bdrv_query_block_graph_info(BlockDriverState *bs,
+ BlockGraphInfo **p_info,
+ Error **errp);
void bdrv_snapshot_dump(QEMUSnapshotInfo *sn);
void bdrv_image_info_specific_dump(ImageInfoSpecific *info_spec,
diff --git a/block/qapi.c b/block/qapi.c
index 5d0a8d2ce3..f208c21ccf 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -411,6 +411,54 @@ 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)
--
2.35.3
- [PATCH v2 00/12] qemu-img info: Show protocol-level information, Hanna Reitz, 2022/06/20
- [PATCH v2 02/12] block/file: Add file-specific image info, Hanna Reitz, 2022/06/20
- [PATCH v2 05/12] qemu-img: Use BlockNodeInfo, Hanna Reitz, 2022/06/20
- [PATCH v2 06/12] block/qapi: Let bdrv_query_image_info() recurse, Hanna Reitz, 2022/06/20
- [PATCH v2 01/12] block: Improve empty format-specific info dump, Hanna Reitz, 2022/06/20
- [PATCH v2 03/12] block/vmdk: Change extent info type, Hanna Reitz, 2022/06/20
- [PATCH v2 04/12] block: Split BlockNodeInfo off of ImageInfo, Hanna Reitz, 2022/06/20
- [PATCH v2 09/12] iotests: Filter child node information, Hanna Reitz, 2022/06/20
- [PATCH v2 08/12] block/qapi: Add indentation to bdrv_node_info_dump(), Hanna Reitz, 2022/06/20
- [PATCH v2 07/12] block/qapi: Introduce BlockGraphInfo,
Hanna Reitz <=
- [PATCH v2 12/12] qemu-img: Change info key names for protocol nodes, Hanna Reitz, 2022/06/20
- [PATCH v2 10/12] iotests/106, 214, 308: Read only one size line, Hanna Reitz, 2022/06/20
- [PATCH v2 11/12] qemu-img: Let info print block graph, Hanna Reitz, 2022/06/20