block: Add an 'x-blockdev-reopen' QMP command

[mirror_qemu.git] / blockdev.c

diff --git a/blockdev.c b/blockdev.c
index 84dd67828970395cef338a7c13ef846c6467131a..3cc51b2ee73418c815e6f6e1f30b5827f64bfb68 100644 (file)
--- a/blockdev.c
+++ b/blockdev.c
@@ -4287,6 +4287,53 @@ fail:
     visit_free(v);
 }
 
+void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp)
+{
+    BlockDriverState *bs;
+    AioContext *ctx;
+    QObject *obj;
+    Visitor *v = qobject_output_visitor_new(&obj);
+    Error *local_err = NULL;
+    BlockReopenQueue *queue;
+    QDict *qdict;
+
+    /* Check for the selected node name */
+    if (!options->has_node_name) {
+        error_setg(errp, "Node name not specified");
+        goto fail;
+    }
+
+    bs = bdrv_find_node(options->node_name);
+    if (!bs) {
+        error_setg(errp, "Cannot find node named '%s'", options->node_name);
+        goto fail;
+    }
+
+    /* Put all options in a QDict and flatten it */
+    visit_type_BlockdevOptions(v, NULL, &options, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        goto fail;
+    }
+
+    visit_complete(v, &obj);
+    qdict = qobject_to(QDict, obj);
+
+    qdict_flatten(qdict);
+
+    /* Perform the reopen operation */
+    ctx = bdrv_get_aio_context(bs);
+    aio_context_acquire(ctx);
+    bdrv_subtree_drained_begin(bs);
+    queue = bdrv_reopen_queue(NULL, bs, qdict, false);
+    bdrv_reopen_multiple(queue, errp);
+    bdrv_subtree_drained_end(bs);
+    aio_context_release(ctx);
+
+fail:
+    visit_free(v);
+}
+
 void qmp_blockdev_del(const char *node_name, Error **errp)
 {
     AioContext *aio_context;