[Qemu-devel] [RFC V2 2/3] block: Allow the user to define "node-name" option.

[Benoît Canet]

Signed-off-by: Benoit Canet <address@hidden>
---
 block.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index c397ee9..6690e3d 100644
--- a/block.c
+++ b/block.c
@@ -872,6 +872,7 @@ int bdrv_file_open(BlockDriverState **pbs, const char 
*filename,
     const char *drvname;
     bool allow_protocol_prefix = false;
     Error *local_err = NULL;
+    const char *node_name = NULL;
     int ret;
 
     /* NULL means an empty set of options */
@@ -879,7 +880,14 @@ int bdrv_file_open(BlockDriverState **pbs, const char 
*filename,
         options = qdict_new();
     }
 
-    bs = bdrv_new("", "");
+    node_name = qdict_get_try_str(options, "node-name");
+    if (node_name && bdrv_find_node(node_name)) {
+        error_setg(errp, "Duplicate node name");
+        return -EINVAL;
+    }
+    bs = bdrv_new("", node_name ? node_name : "");
+    qdict_del(options, "node-name");
+
     bs->options = options;
     options = qdict_clone_shallow(options);
 
@@ -979,6 +987,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict 
*options, Error **errp)
     int back_flags, ret;
     BlockDriver *back_drv = NULL;
     Error *local_err = NULL;
+    const char *node_name = NULL;
 
     if (bs->backing_hd != NULL) {
         QDECREF(options);
@@ -1001,7 +1010,14 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict 
*options, Error **errp)
                                        sizeof(backing_filename));
     }
 
-    bs->backing_hd = bdrv_new("", "");
+    node_name = qdict_get_try_str(options, "node-name");
+    if (node_name && bdrv_find_node(node_name)) {
+        error_setg(errp, "Duplicate node name");
+        QDECREF(options);
+        return -EINVAL;
+    }
+    bs->backing_hd = bdrv_new("", node_name ? node_name : "");
+    qdict_del(options, "node-name");
 
     if (bs->backing_format[0] != '\0') {
         back_drv = bdrv_find_format(bs->backing_format);
-- 
1.8.3.2