[Qemu-block] [PATCH v3 04/11] block: Accept node-name for blockdev-mirror

[Kevin Wolf]

In order to remove the necessity to use BlockBackend names in the
external API, we want to allow node-names everywhere. This converts
blockdev-mirror to accept a node-name without lifting the restriction
that we're operating at a root node.

Signed-off-by: Kevin Wolf <address@hidden>
---
 blockdev.c           | 10 +---------
 qapi/block-core.json |  3 ++-
 qmp-commands.hx      |  3 ++-
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index d9909d0..7e9c7a4 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3654,21 +3654,13 @@ void qmp_blockdev_mirror(const char *device, const char 
*target,
                          Error **errp)
 {
     BlockDriverState *bs;
-    BlockBackend *blk;
     BlockDriverState *target_bs;
     AioContext *aio_context;
     BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
     Error *local_err = NULL;
 
-    blk = blk_by_name(device);
-    if (!blk) {
-        error_setg(errp, "Device '%s' not found", device);
-        return;
-    }
-    bs = blk_bs(blk);
-
+    bs = qmp_get_root_bs(device, errp);
     if (!bs) {
-        error_setg(errp, "Device '%s' has no media", device);
         return;
     }
 
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 98bbd49..a64b598 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1242,7 +1242,8 @@
 #
 # Start mirroring a block device's writes to a new destination.
 #
-# @device: the name of the device whose writes should be mirrored.
+# @device: The device name or node-name of a root node whose writes should be
+#          mirrored.
 #
 # @target: the id or node-name of the block device to mirror to. This mustn't 
be
 #          attached to guest.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index e24d573..45b445f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1735,7 +1735,8 @@ specifies the target of mirror operation.
 
 Arguments:
 
-- "device": device name to operate on (json-string)
+- "device": The device name or node-name of a root node whose writes should be
+            mirrored (json-string)
 - "target": device name to mirror to (json-string)
 - "replaces": the block driver node name to replace when finished
               (json-string, optional)
-- 
1.8.3.1