[Qemu-devel] [PATCH for-3.0 1/3] block/qapi: Add 'qdev' field to query-blockstats result

[Kevin Wolf <kwolf@redhat.com>]

Like for query-block, the client needs to identify which BlockBackend
the returned data is for. Anonymous BlockBackends are identified by the
device model they are attached to. Add a 'qdev' field that contains the
qdev ID or QOM path of the attached device model.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/block-core.json |  5 ++++-
 block/qapi.c         | 10 ++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index d40d5ecc3b..3f09f62fa1 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -866,6 +866,9 @@
 #
 # @node-name: The node name of the device. (Since 2.3)
 #
+# @qdev: The qdev ID, or if no ID is assigned, the QOM path of the block
+#        device. (since 3.0)
+#
 # @stats:  A @BlockDeviceStats for the device.
 #
 # @parent: This describes the file block device if it has one.
@@ -879,7 +882,7 @@
 # Since: 0.14.0
 ##
 { 'struct': 'BlockStats',
-  'data': {'*device': 'str', '*node-name': 'str',
+  'data': {'*device': 'str', '*qdev': 'str', '*node-name': 'str',
            'stats': 'BlockDeviceStats',
            '*parent': 'BlockStats',
            '*backing': 'BlockStats'} }
diff --git a/block/qapi.c b/block/qapi.c
index e12968fec8..50f867d634 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -597,11 +597,21 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
             BlockStatsList *info = g_malloc0(sizeof(*info));
             AioContext *ctx = blk_get_aio_context(blk);
             BlockStats *s;
+            char *qdev;
 
             aio_context_acquire(ctx);
             s = bdrv_query_bds_stats(blk_bs(blk), true);
             s->has_device = true;
             s->device = g_strdup(blk_name(blk));
+
+            qdev = blk_get_attached_dev_id(blk);
+            if (qdev && *qdev) {
+                s->has_qdev = true;
+                s->qdev = qdev;
+            } else {
+                g_free(qdev);
+            }
+
             bdrv_query_blk_stats(s->stats, blk);
             aio_context_release(ctx);
 
-- 
2.13.6