int aio_operate(librados::AioCompletion *c, librados::ObjectWriteOperation *op);
int aio_operate(librados::AioCompletion *c, librados::ObjectReadOperation *op,
bufferlist *pbl);
int aio_operate(librados::AioCompletion *c, librados::ObjectWriteOperation *op);
int aio_operate(librados::AioCompletion *c, librados::ObjectReadOperation *op,
bufferlist *pbl);