block: Accept device model name for x-blockdev-insert-medium

In order to remove the need for BlockBackend names in the external API,
we want to allow qdev device names in all device related commands.

This converts x-blockdev-insert-medium to accept a qdev device name.

As the command is experimental, we can still remove the 'device' option
that uses the BlockBackend name. This requires some test case changes
and is left for another series.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

blockdev.c

@@ -2468,34 +2468,26 @@ out:
     aio_context_release(aio_context);
 }
 
-static void qmp_blockdev_insert_anon_medium(const char *device,
+static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
                                             BlockDriverState *bs, Error **errp)
 {
-    BlockBackend *blk;
     bool has_device;
 
-    blk = blk_by_name(device);
-    if (!blk) {
-        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
-                  "Device '%s' not found", device);
-        return;
-    }
-
     /* For BBs without a device, we can exchange the BDS tree at will */
     has_device = blk_get_attached_dev(blk);
 
     if (has_device && !blk_dev_has_removable_media(blk)) {
-        error_setg(errp, "Device '%s' is not removable", device);
+        error_setg(errp, "Device is not removable");
         return;
     }
 
     if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
-        error_setg(errp, "Tray of device '%s' is not open", device);
+        error_setg(errp, "Tray of the device is not open");
         return;
     }
 
     if (blk_bs(blk)) {
-        error_setg(errp, "There already is a medium in device '%s'", device);
+        error_setg(errp, "There already is a medium in the device");
         return;
     }
 
@@ -2511,11 +2503,20 @@ static void qmp_blockdev_insert_anon_medium(const char *device,
     }
 }
 
-void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
-                                  Error **errp)
+void qmp_x_blockdev_insert_medium(bool has_device, const char *device,
+                                  bool has_id, const char *id,
+                                  const char *node_name, Error **errp)
 {
+    BlockBackend *blk;
     BlockDriverState *bs;
 
+    blk = qmp_get_blk(has_device ? device : NULL,
+                      has_id ? id : NULL,
+                      errp);
+    if (!blk) {
+        return;
+    }
+
     bs = bdrv_find_node(node_name);
     if (!bs) {
         error_setg(errp, "Node '%s' not found", node_name);
@@ -2528,7 +2529,7 @@ void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
         return;
     }
 
-    qmp_blockdev_insert_anon_medium(device, bs, errp);
+    qmp_blockdev_insert_anon_medium(blk, bs, errp);
 }
 
 void qmp_blockdev_change_medium(const char *device, const char *filename,
@@ -2609,7 +2610,7 @@ void qmp_blockdev_change_medium(const char *device, const char *filename,
         goto fail;
     }
 
-    qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
+    qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
     if (err) {
         error_propagate(errp, err);
         goto fail;

docs/qmp-commands.txt

@@ -3328,7 +3328,9 @@ Stay away from it unless you want to help with its development.
 
 Arguments:
 
-- "device": block device name (json-string)
+- "device": block device name (deprecated, use @id instead)
+            (json-string, optional)
+- "id": the name or QOM path of the guest device (json-string, optional)
 - "node-name": root node of the BDS tree to insert into the block device
 
 Example:
@@ -3342,7 +3344,7 @@ Example:
 <- { "return": {} }
 
 -> { "execute": "x-blockdev-insert-medium",
-     "arguments": { "device": "ide1-cd0",
+     "arguments": { "id": "ide0-1-0",
                     "node-name": "node0" } }
 
 <- { "return": {} }

qapi/block-core.json

@@ -2427,14 +2427,17 @@
 # This command is still a work in progress and is considered experimental.
 # Stay away from it unless you want to help with its development.
 #
-# @device:    block device name
+# @device:    #optional Block device name (deprecated, use @id instead)
+#
+# @id:        #optional The name or QOM path of the guest device (since: 2.8)
 #
 # @node-name: name of a node in the block driver state graph
 #
 # Since: 2.5
 ##
 { 'command': 'x-blockdev-insert-medium',
-  'data': { 'device': 'str',
+  'data': { '*device': 'str',
+            '*id': 'str',
             'node-name': 'str'} }