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[Qemu-block] [PULL v2 17/40] block: check for existing device IDs in ext

From: Kevin Wolf
Subject: [Qemu-block] [PULL v2 17/40] block: check for existing device IDs in external_snapshot_prepare()
Date: Tue, 10 Nov 2015 15:09:17 +0100

From: Alberto Garcia <address@hidden>

The 'snapshot-node-name' parameter of blockdev-snapshot-sync allows
setting the node name of the image that is going to be created.

Before creating the image, external_snapshot_prepare() checks that the
name is not already being used. The check is however incomplete since
it only considers existing node names, but node names must not clash
with device IDs either because they share the same namespace.

If the user attempts to create a snapshot using the name of an
existing device for the 'snapshot-node-name' parameter the operation
will eventually fail, but only after the new image has been created.

This patch replaces bdrv_find_node() with bdrv_lookup_bs() to extend
the check to existing device IDs, and thus detect possible name
clashes before the new image is created.

Signed-off-by: Alberto Garcia <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
Reviewed-by: Jeff Cody <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
 blockdev.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 34f6e5b..0c6c2a7 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1579,8 +1579,9 @@ static void external_snapshot_prepare(BlkTransactionState 
-    if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
-        error_setg(errp, "New snapshot node name already existing");
+    if (has_snapshot_node_name &&
+        bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
+        error_setg(errp, "New snapshot node name already in use");

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