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Rob Norris a49c957299 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
2025-08-12 17:24:11 -07:00
.github CI: match and trim out internal timestamp for test prefix 2025-08-12 17:23:28 -07:00
cmd Fix zdb pool/ with -k 2025-08-12 17:21:47 -07:00
config config: Avoid void main() in toolchain-simd.m4 2025-08-12 17:23:57 -07:00
contrib Introduce zfs rewrite subcommand (#17246) 2025-08-07 12:34:28 -04:00
etc SPDX: license tags: MIT 2025-04-16 09:59:44 -07:00
include SIMD: Don't require definition of HAVE_XSAVE 2025-08-12 17:23:51 -07:00
lib Validate mountpoint on path-based unmount using statx 2025-08-05 12:27:25 -04:00
man Introduce zfs rewrite subcommand (#17246) 2025-08-07 12:34:28 -04:00
module linux/zvol_os: fix crash with blk-mq on Linux 4.19 2025-08-12 17:24:11 -07:00
rpm rpm: don't list /sbin/zgenhostid twice in %files 2025-08-12 17:24:08 -07:00
scripts Linux build: handle CONFIG_OBJTOOL_WERROR=y 2025-08-07 13:10:33 -04:00
tests ZTS: mmap_ftruncate test to confirm async writeback behaviour 2025-08-12 17:23:35 -07:00
udev Update 69-vdev.rules.in 2025-05-28 16:00:28 -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 08:58:47 -08:00
.gitmodules .gitmodules: link to openzfs github repository 2021-04-12 09:37:23 -07:00
.mailmap AUTHORS/mailmap: update with new contributors 2025-05-28 16:00:28 -07:00
AUTHORS AUTHORS/mailmap: update with new contributors 2025-05-28 16:00:28 -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 2025-08-07 13:10:33 -04:00
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 spdxcheck: program to check SPDX license tags 2025-04-16 09:59:45 -07:00
META Tag zfs-2.3.3 2025-06-19 08:21:04 -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) 2024-08-05 16:56:45 -07:00
RELEASES.md Update RELEASES.md LTS release to 2.2 2025-02-25 22:27:10 +05:00
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.