So you defined 3 systems as "significant", and are challenging to name more, when you know ahead of time nothing else falls under your definition. So brave! Ac

So you defined 3 systems as "significant", and are challenging to name more, when you know ahead of time nothing else falls under your definition. So brave! According to Google Trends, JFS is the third most popular file system on Linux, and Reiser is #1. F2FS is pretty big too, and it's the fastest on Linux 4 / SSD: http://www.phoronix.com/scan.php?page=article&item=linux-40-ssd&num=2 http://www.phoronix.com/scan.php?page=article&item=linux-40-...