diff --git a/block/file-posix.c b/block/file-posix.c
index 19c48a043e..d13e99c43f 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -392,6 +392,11 @@ static QemuOptsList raw_runtime_opts = {
             .type = QEMU_OPT_STRING,
             .help = "host AIO implementation (threads, native)",
         },
+        {
+            .name = "locking",
+            .type = QEMU_OPT_STRING,
+            .help = "file locking mode (on/off/auto, default: auto)",
+        },
         { /* end of list */ }
     },
 };
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 30d5952321..52e3ecd505 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2127,11 +2127,15 @@
 #
 # @filename:    path to the image file
 # @aio:         AIO backend (default: threads) (since: 2.8)
+# @locking:     whether to enable file locking. If set to 'auto', only enable
+#               when Open File Descriptor (OFD) locking API is available
+#               (default: auto, since 2.10)
 #
 # Since: 2.9
 ##
 { 'struct': 'BlockdevOptionsFile',
   'data': { 'filename': 'str',
+            '*locking': 'OnOffAuto',
             '*aio': 'BlockdevAioOptions' } }
 
 ##