c0aab8b8f9
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 |
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README.md
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.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
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
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.