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Rob Norris e1a807b50d linux/zvol_os: fix crash with blk-mq on Linux 4.19
03987f71e3 (#16069) added a workaround to get the blk-mq hardware
context for older kernels that don't cache it in the struct request.
However, this workaround appears to be incomplete.

In 4.19, the rq data context is optional. If its not initialised, then
the cached rq->cpu will be -1, and so using it to index into mq_map
causes a crash.

Given that the upstream 4.19 is now in extended LTS and rarely seen,
RHEL8 4.18+ has long carried "modern" blk-mq support, and the cached
hardware context has been available since 5.1, I'm not going to huge
lengths to get queue selection correct for the very few people that are
likely to feel it. To that end, we simply call raw_smp_processor_id() to
get a valid CPU id and use that instead.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Closes #17597
2025-10-16 17:03:47 -07:00
.github CI: Fix FreeBSD 15.0 by staying on ALPHA4 due to broken ALPHA5 image 2025-10-16 16:45:07 -07:00
cmd GCC 15: Fix unterminated-string-initialization (#17244) 2025-05-27 15:03:11 -07:00
config Linux 6.16: remove writepage and readahead_page 2025-10-16 16:50:25 -07:00
contrib docs: fix a few small typos (#17804) 2025-10-16 16:45:07 -07:00
etc docs: fix a few small typos (#17804) 2025-10-16 16:45:07 -07:00
include Skip dbuf_evict_one() from dbuf_evict_notify() for reclaim thread 2025-10-16 17:03:47 -07:00
lib cred: properly pass and test creds on other threads (#17273) 2025-06-02 16:49:51 -07:00
man [zfs-2.2.8] Revert "vdev_disk: default to classic submission for 2.2.x" 2025-05-29 15:29:27 -07:00
module linux/zvol_os: fix crash with blk-mq on Linux 4.19 2025-10-16 17:03:47 -07:00
rpm RPM: Hold back incompatible kernel packages on Fedora 2025-05-27 14:54:34 -07:00
scripts Linux build: handle CONFIG_OBJTOOL_WERROR=y 2025-10-16 16:50:20 -07:00
tests CI: Add ZTS -O option, log Setup Testing Machines step 2025-10-16 16:45:07 -07:00
udev Avoid computing strlen() inside loops 2024-11-05 15:43:52 -08:00
.cirrus.yml CI: add FreeBSD build with Cirrus CI 2023-10-07 09:08:20 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Packaging: Auto-generate changelog during configure (#15528) 2023-11-16 14:23:03 -08:00
.gitmodules .gitmodules: link to openzfs github repository 2021-04-12 09:37:23 -07:00
.mailmap AUTHORS: refresh with recent new contributors (#16362) 2024-07-23 11:58:49 -07:00
AUTHORS AUTHORS: refresh with recent new contributors (#16362) 2024-07-23 11:58:49 -07:00
autogen.sh Ubuntu 22.04 integration: ShellCheck 2022-11-18 11:24:48 -08:00
CODE_OF_CONDUCT.md Documentation corrections 2022-12-22 11:34:28 -08:00
configure.ac Linux build: handle CONFIG_OBJTOOL_WERROR=y 2025-10-16 16:50:20 -07:00
copy-builtin copy-builtin: add hooks with sed/>> 2022-05-10 10:17:43 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Process script directory for all configs 2022-10-27 16:45:14 -07:00
META Tag zfs-2.2.8 2025-06-10 09:21:24 -07:00
NEWS Fix NEWS file 2020-08-26 21:44:41 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md FreeBSD: remove support for FreeBSD < 13.0-RELEASE (#16372) 2024-11-15 10:15:00 -08:00
RELEASES.md Add RELEASES.md file 2021-04-02 16:33:40 -07:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.