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block: Mark bdrv_child_perm() GRAPH_RDLOCK
This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_child_perm() need to hold a reader lock for the graph because some implementations access the children list of a node. The callers of bdrv_child_perm() conveniently already hold the lock. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20230911094620.45040-16-kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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