block: Allow omitting the file name when using driver-specific options

[thirdparty/qemu.git] / blockdev.c

diff --git a/blockdev.c b/blockdev.c
index 6f2b7592ce2b1b8dd2ef9e7fcc5306ec95e6e814..8cdc9ce16ae5f50e35af226c5e07ea7241606117 100644 (file)
--- a/blockdev.c
+++ b/blockdev.c
@@ -658,7 +658,11 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
         abort();
     }
     if (!file || !*file) {
-        return dinfo;
+        if (qdict_size(bs_opts)) {
+            file = NULL;
+        } else {
+            return dinfo;
+        }
     }
     if (snapshot) {
         /* always use cache=unsafe with snapshot */
@@ -697,10 +701,10 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
     if (ret < 0) {
         if (ret == -EMEDIUMTYPE) {
             error_report("could not open disk image %s: not in %s format",
-                         file, drv->format_name);
+                         file ?: dinfo->id, drv->format_name);
         } else {
             error_report("could not open disk image %s: %s",
-                         file, strerror(-ret));
+                         file ?: dinfo->id, strerror(-ret));
         }
         goto err;
     }