rbd: move ctl_mutex lock inside rbd_get_client()
Since rbd_get_client() is only called in one place, move the acquisition of the mutex around that call inside that function. Furthermore, within rbd_get_client(), it appears the mutex only needs to be held while calling rbd_client_create(). (Moving the lock inside that function will wait for the next patch.) Signed-off-by: NAlex Elder <elder@dreamhost.com> Signed-off-by: NSage Weil <sage@newdream.net>
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