+ struct lttng_kernel_ring_buffer_client_cb cb;
+};
+
+/*
+ * ring buffer private context
+ *
+ * Private context passed to lib_ring_buffer_reserve(), lib_ring_buffer_commit(),
+ * lib_ring_buffer_try_discard_reserve(), lib_ring_buffer_align_ctx() and
+ * lib_ring_buffer_write().
+ *
+ * Get struct lttng_kernel_ring_buffer_ctx parent with container_of().
+ */
+
+struct lttng_kernel_ring_buffer_ctx_private {
+ /* input received by lib_ring_buffer_reserve(). */
+ struct lttng_kernel_ring_buffer_channel *chan; /* ring buffer channel */
+
+ /* output from lib_ring_buffer_reserve() */
+ int reserve_cpu; /* processor id updated by the reserve */
+ size_t slot_size; /* size of the reserved slot */
+ unsigned long buf_offset; /* offset following the record header */
+ unsigned long pre_offset; /*
+ * Initial offset position _before_
+ * the record is written. Positioned
+ * prior to record header alignment
+ * padding.
+ */
+ u64 tsc; /* time-stamp counter value */
+ unsigned int rflags; /* reservation flags */
+
+ struct lttng_kernel_ring_buffer *buf; /*
+ * buffer corresponding to processor id
+ * for this channel
+ */
+ struct lttng_kernel_ring_buffer_backend_pages *backend_pages;
+
+ /*
+ * Records lost counts are only loaded into these fields before
+ * reserving the last bytes from the ring buffer.
+ */
+ unsigned long records_lost_full;
+ unsigned long records_lost_wrap;
+ unsigned long records_lost_big;