F2FS Is Ready With Various Enhancements For Linux 4.12
Written by Michael Larabel in Linux Storage on 8 May 2017 at 03:48 PM EDT. 7 Comments
The latest Linux 4.12 merge window pull request worth talking about is that of the Flash-Friendly File-System (F2FS) updates.

F2FS for Linux 4.12 has a variety of enhancements, mostly in regards to different aspects of the file-system's performance. As usual, there are also many bug fixes.
= Enhancement
- disable heap-based allocation by default
- issue small-sized discard commands by default
- change the policy of data hotness for logging
- distinguish IOs in terms of size and wbc type
- start SSR earlier to avoid foreground GC
- enhance data structures managing discard commands
- enhance in-place update flow
- add some more fault injection routines
- secure one more xattr entry

= Bug fix
- calculate victim cost for GC correctly
- remain correct victim segment number for GC
- race condition in nid allocator and initializer
- stale pointer produced by atomic_writes
- fix missing REQ_SYNC for flush commands
- handle missing errors in more corner cases
All the F2FS details for this next kernel cycle can be found via the kernel mailing list. Fresh Linux file-system benchmarks will come on Phoronix once the 4.12 merge window has passed.
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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 20,000 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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