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1d68bebb70
It is unused for now, but the iobuf structure now owns a pointer to a buffer. This buffer will be used to perform mux-to-mux fast-forwarding when splicing is not supported or unusable. This pointer should be filled by an endpoint to let the opposite one forward data. Extra fields, in addition to the buffer, are mandatory because the buffer may already contains some data. the ".offset" field may be used may be used as the position to start to copy data. Finally, the amount of data copied in this buffer must be saved in ".data" field. Some flags are also added to prepare next changes. And helper stconn fnuctions are updated to also count data in the buffer. For a first implementation, it is not planned to handle data in the buffer and in the pipe in same time. But it will be possible to do so.