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Fabian-Gruenbichler fa2cbd4007 zvols: prevent overflow of minor device numbers
currently, the linux kernel allows 2^20 minor devices per major device
number.  ZFS reserves blocks of 2^4 minors per zvol: 1 for the zvol
itself, the other 15 for the first partitions of that zvol. as a result,
only 2^16 such blocks are available for use.

there are no checks in place to avoid overflowing into the major device
number when more than 2^16 zvols are allocated (with volmode=dev or
default). instead of ignoring this limit, which comes with all sorts of
weird knock-on effects, detect this situation and simply fail allocating
the zvol block device early on.

without this safeguard, the kernel will reject the attempt to create an
already existing block device, but ZFS doesn't handle this error and
gets confused about which zvol occupies which minor slot, potentially
resulting in kernel NULL derefs and other issues later on.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Closes #16006
2024-04-22 09:23:23 -07:00
.github Move nodes into correct subgraphs 2024-01-29 14:53:29 -08:00
cmd Speculative prefetch for reordered requests 2024-04-19 10:13:38 -07:00
config zvol_os: fix compile with blk-mq on Linux 4.x 2024-04-17 10:10:24 -07:00
contrib Packaging: Auto-generate changelog during configure (#15528) 2023-11-16 14:23:03 -08:00
etc Revert "systemd: Use non-absolute paths in Exec* lines" 2023-06-07 11:14:05 -07:00
include bdev_discard_supported: understand discard_granularity=0 2024-04-19 10:19:53 -07:00
lib dmu: Allow buffer fills to fail 2024-02-20 15:53:02 -08:00
man Speculative prefetch for reordered requests 2024-04-19 10:13:38 -07:00
module zvols: prevent overflow of minor device numbers 2024-04-22 09:23:23 -07:00
rpm fix: preserve linux kmod signature in zfs-kmod rpm spec 2024-01-29 14:53:29 -08:00
scripts Add zfs_prepare_disk script for disk firmware install 2023-11-06 16:45:07 -08:00
tests BRT: Check pool clone stats in more tests 2024-04-19 10:13:38 -07:00
udev Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
.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 mailmap: initial, trying to tidy up a lot of the commit history 2023-10-10 19:19:09 -07:00
AUTHORS AUTHORS: update with missing names 2023-10-10 19:19:09 -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 Packaging: Auto-generate changelog during configure (#15528) 2023-11-16 14:23:03 -08:00
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 Linux 6.8 compat: META (#16099) 2024-04-22 09:23:23 -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: Fix the build on FreeBSD 12 2023-11-28 15:19:07 -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 12.4-RELEASE.