rbd: make get_lock_owner_info() return a single locker or NULL
commit f38cb9d9 upstream. Make the "num_lockers can be only 0 or 1" assumption explicit and simplify the API by getting rid of output parameters in preparation for calling get_lock_owner_info() twice before blocklisting. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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3d215ad4
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