  Nowadays, Linux file systems have to manage millions of tiny files for
different applications, and face with higher metadata operations. So how to
provide such high metadata performance with such enormous number of files and
large scale directories is a big challenge for Linux file system. We viewed
that metadata lookup operations dominate metadata workload and incur low
metadata performance. In this paper, we present a metadata cache to accelerate
metadata access for Linux file system. Through this optimization, the Linux
file system (such as EXT2, EXT4, BTRFS, etc.) can gain improvement in read
rates as well as write rates.
