The data for the figures in this paper can all be found in my dissertation Improving File System Performance with Predictive Caching, which can be found on the web at https://euclid.nmu.edu/~randy.
An excellent paper with more technical detail can be found at https://step.polymtl.ca/~ldd/ext2fs/ext2fs_toc.html.
Some performance data can be found at https://www.silkroad.com/linux-bm.html.