Linux Kernel: Linux 4.15, F2FS, Block Layer
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Linux 4.15 Is Shaping Up To be An Exciting Kernel, Especially For AMD Users
There still is a few weeks to go until the Linux 4.14 kernel will be released, but following that the Linux 4.15 kernel is shaping up to be a very exciting cycle.
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F2FS Tools 1.9 Released With Encryption & More
An updated version of the user-space F2FS (Flash Friendly File-System) utilities was quietly released a few weeks back.
The f2fs-tools 1.9 update is a fairly big update for adding the bits for recent additions to the F2FS kernel driver. Now handled by f2fs-tools is dealing with encryption support, sparse support, inode checksum support, no-heap allocation is enabled by default, and support for the CP_TRIMMED_FLAG.
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Improvements in the block layer
Jens Axboe is the maintainer of the block layer of the kernel. In this capacity, he spoke at Kernel Recipes 2017 on what's new in the storage world for Linux, with a particular focus on the new block-multiqueue subsystem: the degree to which it's been adopted, a number of optimizations that have recently been made, and a bit of speculation about how it will further improve in the future.
Back in 2011, Intel published a Linux driver for NVM Express (or NVMe, where NVM is the Non-Volatile Memory Host Controller Interface), which was its new bus for accessing solid-state storage devices (SSDs). This driver was incorporated into the mainline kernel in 2012, first appearing in 3.3. It allowed new, fast SSD devices to be run at speed, but that gave no improvement if the block subsystem continued to treat them as pedestrian hard drives. So a new, scalable block layer known as blk-mq (for block-multiqueue) was developed to take better advantage of these fast devices; it was merged for 3.13 in 2014. It was introduced with the understanding that all of the old drivers would be ported to blk-mq over time; this continues, even though most of the mainstream block storage devices have by now been successfully ported. Axboe's first focus was a status update on this process.
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