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block: Avoid printing NULL string in error messages

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Even for nodes that have a BlockBackend attached, bdrv_get_parent_name()
can return NULL if the BB is anonymous (e.g. it belongs to a block job
or a device that was created with a drive=<node-name> option).

Remove the information from the error message. The user probably knows
already why the node is still in use.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf
2016-09-21 14:56:09 +02:00
parent 62acae8a9d
commit e467da7b92
2 changed files with 6 additions and 9 deletions
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6
tests/qemu-iotests/085.out
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@@ -68,9 +68,9 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/
=== Invalid command - snapshot node used as active layer ===
{"error": {"class": "GenericError", "desc": "The snapshot is already in use by virtio0"}}
{"error": {"class": "GenericError", "desc": "The snapshot is already in use by virtio0"}}
{"error": {"class": "GenericError", "desc": "The snapshot is already in use by virtio1"}}
{"error": {"class": "GenericError", "desc": "The snapshot is already in use"}}
{"error": {"class": "GenericError", "desc": "The snapshot is already in use"}}
{"error": {"class": "GenericError", "desc": "The snapshot is already in use"}}
=== Invalid command - snapshot node used as backing hd ===