The out-of-tree Reiser4 and Reiser5 (Reiser4 v5) patches have been updated against the recently stabilized Linux 5.5 kernel.

With the recently released Linux 5.5 and its new features, one of the prominent changes on the storage front was the Btrfs file-system picking up new "RAID1C3" and "RAID1C4" modes for allowing either three or four copies of RAID1 data across more drives to potentially allow up to three of four drives to fail in a RAID1 array while still being able to recover that data for this file-system with its native RAID capabilities.

One of the last features to land today for Linux 5.6 ahead of the merge window closure is Western Digital's Zonefs file-system.

After being added to Linux 5.4 and then being ejected a week later when it was clear not enough testing took place, the VirtualBox Shared Folder "VBOXSF" driver is now trying to make it into Linux 5.6.

Following the Linux 5.5 NFS client adding support for server-to-server cross-device offloaded copies, the NFSD side for Linux 5.6 is now enabling its portion of handling server-side copies.

With the NFS client are a few new features with its code to be found in Linux 5.6.

It has been a while since there has been any new developments to report on BFQ, the Budget Fair Queueing I/O scheduler that offers both low-latency and high throughput modes, bandwidth and latency guarantees, and other functionality. With the ongoing Linux 5.6 cycle, BFQ at least has picked up some fixes.

FS-VERITY came in Linux 5.4 as a means of transparent integrity and authenticity support for read-only files. This Google creation is seeing better performance with Linux 5.6.

The F2FS file-system compression functionality is the main feature addition for this flash-optimized file-system coming with the Linux 5.6 kernel. This native LZO/LZ4 compression support is geared for optimizing the lifespan of SSDs/flash memory thanks to reducing disk writes.

File-system / storage activity is as busy as always during the Linux kernel merge windows.

Btrfs in the now-stable Linux 5.5 kernel is exciting for its new RAID1C3/RAID1C4 capability allowing three/four copies of data rather than just two while looking ahead to Linux 5.6 is further feature work on this Linux file-system.

ZFS On Linux 0.8.3 is out today as the first official update to ZoL since last September.

While there has been the initial Microsoft exFAT file-system driver since Linux 5.4, that code is based on a vintage snapshot of prior Samsung code. Samsung engineers meanwhile have been working to upstream a much newer and better off exFAT implementation to replace that existing driver and it looks like it could be ready for Linux 5.6.

After months of work by Facebook engineers, it looks like the new async discard support for Btrfs is ready for the upcoming Linux 5.6 cycle as a win for this Linux file-system on solid-state storage making use of TRIM/DISCARD functionality.

Introduced last month was Zonefs as a new Linux file-system developed by Western Digital. It's looking like that new file-system could be ready for introduction with the upcoming Linux 5.6 cycle.

Linux kernel creator Linus Torvalds doesn't recommend using ZFS On Linux at least until Oracle were to re-license the code to make it friendly for mainline inclusion. But even then he doesn't seem turned on by the ZFS features or general performance.

A few days ago I wrote about a big improvement to write performance for EXT4's Direct I/O code path but that is not the only DIO optimization coming for Linux 5.6. Thanks to IBM, another big EXT4 DIO boost can be found for database workloads.

For those of you running EXT4 with Direct I/O on the likes of Intel Optane DC Persistent Memory or PMEM simulated via a virtual machine, better write performance is coming when overwriting already allocated blocks.

Well, this is a hell of a way to surprisingly end the 2010s... Reiser5. Reiser5 brings a new format to the Reiser file-system and brings some new innovations to this file-system while keeping to its controversial name.

Western Digital has been contributing a lot more to the Linux kernel in recent years from RISC-V architecture bits to storage enhancements. The most recent code they have been working on in recent weeks is a brand new Linux file-system.

Back in October we reported on work done by Google on FSCRYPT inline encryption support for allowing the Linux file-system encryption framework to handle the encrypt/decrypt more optimally for modern mobile SoCs with inline encryption hardware. It's looking like that work might be ready to go now for Linux 5.6 after missing out on the 5.5 cycle.

F2FS is the latest Linux file-system gaining transparent data compression support for saving on-disk space. With F2FS there are two compression algorithms supported so far plus the support of making the data compression opt-in per file or applying the compression to select file extensions(s).

Oracle's had quite the file-system history and looking ahead to 2020 they appear committed to the XFS boat on the Linux front. Oracle retains control over the upstream ZFS file-system and could push for better Linux integration of that file-system plus they formerly employed Btrfs creator Chris Mason during its infancy. But they also employ lead XFS maintainer Darrick Wong and in keeping in-line with Red Hat Enterprise Linux defaults embrace that as their primary file-system for Oracle Linux.

With NFSv4.2 is the server-side copy (SSC) functionality with the Linux 5.5 kernel's NFS client-side support for that support in allowing "inter" copy offloads between different NFS servers.

When it comes to the storage/file-system changes with the in-development Linux 5.5 kernel one of the most prominent end-user-facing changes is more robust RAID1 for Btrfs with the ability to have three or four copies of the data rather than just two copies, should data safety be of utmost importance and concerned over the possibility of two disks in an array failing.

The Flash-Friendly File-System continues to be refined and with the forthcoming Linux 5.5 kernel are more improvements albeit largely bug fixes.

The XFS file-system is seeing a large number of changes for the in-development Linux 5.5 kernel.

The Linux 5.5 block changes landed earlier this week with a wide variety of driver and core improvements. There are some I/O optimizations to make the pull exciting as well as the NVMe HWMON drive temperature reporting integration.

While EXT4 is the most common Linux file-system among distributions and is quite mature at this stage, it does continue seeing noteworthy improvements every so often with new kernel releases. With Linux 5.5 there are more notable improvements on deck.

David Sterba sent in his pull request early of the Btrfs file-system changes that are ready for merging into the Linux 5.5 merge window next week.