lib_ring_buffer_offset_address(&buf->backend,
subbuf_idx * chan->backend.subbuf_size);
struct lttng_channel *lttng_chan = channel_get_private(chan);
lib_ring_buffer_offset_address(&buf->backend,
subbuf_idx * chan->backend.subbuf_size);
struct lttng_channel *lttng_chan = channel_get_private(chan);