Reiser4 Patch Released For Linux 4.20 Kernel Support Plus A Few Fixes
Written by Michael Larabel in Linux Storage on 3 January 2019 at 01:46 AM EST. 9 Comments
LINUX STORAGE --
While a few days ago I wrote about the Reiser4 port to the Linux 4.20 kernel being a work-in-progress, now it's officially been released with their first tagged patch release since Linux 4.18.

Most often the Reiser4 patch releases for new Linux kernels is just that: simply getting this once promising file-system working on the mainline Linux kernel source tree. With the reiser4-for-4.20.0.patch, this time around it also adds a couple new fixes:
- Unlock page in error path of write_begin_cryptcompress(). This fixes up a deadlock reproducible in latest kernels (e.g. with stress.sh -n 20).

- Remove unneeded calls of znode_make_dirty() which are leaks of reserved disk space in scan_ctail() and pre_convert_ctail() reported by Pierre-Philipp Braun.

- Keep a track of read-only state in reiser4 context. Added a new bit field .ro in reiser4 context to indicate that execution started in read-only file system, so that disk space wasn't grabbed, and we don't need to update file's atime in that context. This prevents an oops at boot time for a system with root over reiser4 partition reported by Pierre-Philipp Braun.

With Reiser4 not a candidate for mainlining at least for now, those wanting to try out the file-system will need to grab the patch from SourceForge.
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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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