/*
* The upper-limit of data written inside the buffer.
*
* With the total_bytes_written it allows us to keep track of when the
* cache contains contiguous metadata ready to be sent to the RB.
/*
* The upper-limit of data written inside the buffer.
*
* With the total_bytes_written it allows us to keep track of when the
* cache contains contiguous metadata ready to be sent to the RB.