Red Hat's David Howells has sent in pull requests introducing the new fsinfo() system call and mount/superblock notifications and as part of that a general notification mechanism for the kernel.

Within minutes of Linux 5.6 being released on Sunday evening, Jens Axboe was already with sending in the start of the various storage areas to the kernel that he oversees with their feature updates for Linux 5.7.

It remains to be seen if it will make it for the upcoming Linux 5.7 kernel merge window, but the FSCRYPT inline encryption functionality has now made it up to its ninth revision for offering better file-system encryption performance on modern mobile SoCs.

Cloudflare employs Linux disk encryption on their servers and with some optimizations have made it at least two times faster throughput while also lowering the latency.

Being introduced by Linux 5.6 is optional F2FS transparent data compression support that was implemented with LZO and LZ4. Now for the Linux 5.7 kernel there is Zstd compression support on the way.

Hard to believe that former Linux developer Hans Reiser was already eligible for parole, but it was denied this month. The former developer responsible for creating the once-promising ReiserFS and Reiser4 file-systems will remain locked up for at least three more years.

There has been a lot of interesting work happening in the Linux storage space in recent time like IO_uring, the countless file-system innovations, and other features -- including one addition that's now up to its nineteenth revision and is for providing more VFS/file-system and mount topology information.

Since its introduction in Linux 5.1, IO_uring has been coming together quite nicely and getting better with each new kernel release. IO_uring is the effort for delivering faster and more efficient I/O by avoiding excess copies and other efficiency improvements over the existing Linux AIO code. Here are some comparison benchmarks off Linux 5.6 Git.

With the Linux 5.7 kernel this spring there is going to be a new exFAT file-system drive developed by Samsung as outlined last week. While that is being added to the formal file-system area of the kernel rather than staging so both could co-exist for a transition period, already with Linux 5.7 will be the removal of the existing staging driver.

Linux 5.4 brought a preliminary Microsoft exFAT file-system driver after Microsoft made the exFAT specification public and encouraged the support for Linux. But with the Linux 5.7 kernel this spring, a new exFAT file-system driver is going to land that is a much improved version of the earlier code.

Samba 4.12 is out this week as a big update to this prominent SMB/CIFS implementation for file exchange and printer sharing predominantly with Microsoft Windows systems.

For those that have been wanting to take the experimental Reiser5 for a test drive since being announced at the end of 2019, new versions of the Reiser4 and Reiser5 file-system kernel patches have been posted.

FSCRYPT as the file-system encryption framework for the Linux kernel and is currently wired up for EXT4, F2FS, and UBIFS to offer native encryption capabilities is currently seeing improvements so the separate casefolding (case-insensitive) file/folder support can work on encrypted directories.

Longtime Linux kernel developer David Howells of Red Hat sent out his latest patch revision exposing new capabilities for exposing more VFS and mount information to user-space along with notification support for any file-system mount topology changes.

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.