[Qemu-devel] [PATCH] quorum: Implement bdrv_get_specific_info

[Wen Congyang <wency@cn.fujitsu.com>]

The monitor command 'query-block' or 'info block' will output the format specific
information. So we can get each child's child-name after this patch. This useful
for dynamic reconfiguration.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 block/quorum.c       | 27 +++++++++++++++++++++++++++
 qapi/block-core.json | 15 ++++++++++++++-
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/block/quorum.c b/block/quorum.c
index da15465..afe6c3f 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1054,6 +1054,31 @@ static void quorum_refresh_filename(BlockDriverState *bs, QDict *options)
     bs->full_open_options = opts;
 }
 
+static ImageInfoSpecific *quorum_get_specific_info(BlockDriverState *bs)
+{
+    int i;
+    BDRVQuorumState *s = bs->opaque;
+    ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
+    strList **next;
+
+    *spec_info = (ImageInfoSpecific){
+        .type = IMAGE_INFO_SPECIFIC_KIND_QUORUM,
+        .u = {
+            .quorum.data = g_new0(ImageInfoSpecificQuorum, 1),
+        },
+    };
+
+    next = &spec_info->u.quorum.data->child_name;
+    for (i = 0; i < s->num_children; i++) {
+        *next = g_new0(strList, 1);
+        (*next)->value = g_strdup(s->children[i]->name);
+        (*next)->next = NULL;
+        next = &(*next)->next;
+    }
+
+    return spec_info;
+}
+
 static BlockDriver bdrv_quorum = {
     .format_name                        = "quorum",
     .protocol_name                      = "quorum",
@@ -1077,6 +1102,8 @@ static BlockDriver bdrv_quorum = {
 
     .is_filter                          = true,
     .bdrv_recurse_is_first_non_filter   = quorum_recurse_is_first_non_filter,
+
+    .bdrv_get_specific_info             = quorum_get_specific_info,
 };
 
 static void bdrv_quorum_init(void)
diff --git a/qapi/block-core.json b/qapi/block-core.json
index b1cf77d..bd3e12d 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -75,6 +75,18 @@
   } }
 
 ##
+# @ImageInfoSpecificQuorum:
+#
+# @child-name: List of child name
+#
+# Since: 2.7
+##
+{ 'struct': 'ImageInfoSpecificQuorum',
+  'data': {
+      'child-name': ['str']
+  } }
+
+##
 # @ImageInfoSpecific:
 #
 # A discriminated record of image format specific information structures.
@@ -85,7 +97,8 @@
 { 'union': 'ImageInfoSpecific',
   'data': {
       'qcow2': 'ImageInfoSpecificQCow2',
-      'vmdk': 'ImageInfoSpecificVmdk'
+      'vmdk': 'ImageInfoSpecificVmdk',
+      'quorum': 'ImageInfoSpecificQuorum'
   } }
 
 ##
-- 
2.5.5