block: Mark bdrv_root_attach_child() GRAPH_WRLOCK
Instead of taking the writer lock internally, require callers to already hold it when calling bdrv_root_attach_child(). These callers will typically already hold the graph lock once the locking work is completed, which means that they can't call functions that take it internally. Signed-off-by:Kevin Wolf <kwolf@redhat.com> Message-ID: <20231027155333.420094-5-kwolf@redhat.com> Reviewed-by:
Eric Blake <eblake@redhat.com> Signed-off-by:
Kevin Wolf <kwolf@redhat.com>
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