In addition to the Btrfs file system update, the Linux kernel 5.19 under development also optimizes exFAT, ext4 and XFS file systems During the consolidation window, the Linux team made it clear that it would fix multiple errors in the ext4, exFAT and erofs file systems and add some interesting features.
There are mainly two updates for exFAT file system. First, Sony engineers contributed about 73% of the performance improvement when zeroing the cluster by reducing the number of block requests. This is a big improvement for exFAT.
Another improvement for exFAT is the new "sys _tz" mount option. This is to use the system time zone as the time offset when processing the exFAT timestamp that is regarded as the UTC offset of the current local time.
The next step is the erofs update of the read-only Linux file system originally developed by Huawei, which is used by some Android devices. The major change to erofs in Linux 5.19 is to use fscache / cachefiles infrastructure to load erofs on demand. This introduces new file based backend and other improvements. For all details, see git merge linked earlier.
In addition to erofs now supports on-demand load support on fscache, Linux 5.19 now also supports idmapped mount, NFS export and various repairs.
The ext4 update focuses on various bug fixes and cleanup. Bug fixes include items found through different obfuscators and error injection tools. Overall, the cycle of this widely used linux file system is relatively light.