F2FS Feature Work For The Linux 4.11 Kernel
Written by Michael Larabel in Linux Storage on 1 March 2017 at 06:24 AM EST. 16 Comments
LINUX STORAGE --
The Flash-Friendly File-System (F2FS) will see new features introduced with the Linux 4.11 kernel.

F2FS for Linux 4.11 is making use of a separate thread for discards to avoid latency problems during checkpoints and fstrim, some prep work for open-channel SSD support, on-disk bitmaps are being introduced, and various other changes.

Here is a look at the F2FS changes from the Linux 4.11 pull request by Jaegeuk Kim:
== Enhancement ==
- introduce on-disk bitmaps to avoid scanning NAT blocks when getting free nids
- support IO alignment to prepare open-channel SSD integration in future
- introduce a discard thread to avoid long latency during checkpoint and fstrim
- use SSR for warm node and enable inline_xattr by default
- introduce in-memory bitmaps to check FS consistency for debugging
- improve write_begin by avoiding needless read IO

== Bug fix ==
- fix broken zone_reset behavior for SMR drive
- fix wrong victim selection policy during GC
- fix missing behavior when preparing discard commands
- fix bugs in atomic write support and fiemap
- workaround to handle multiple f2fs_add_link calls having same name
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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