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In 2016, the authors of PVS Studio ran it on the FreeBSD kernel, which identified a number of bugs / cleanup opportunities in the FreeBSD ZFS kernel code. A few of them persist to the present day: https://reviews.freebsd.org/D5245 Note that the scan was done against freebsd/freebsd-src@46763fd4ca. In particular, we have the following in free_blocks(): \sys\cddl\contrib\opensolaris\uts\common\fs\zfs\dnode_sync.c (174): error V547: Expression '__left >= __right' is always true. Unsigned type value is always >= 0. \sys\cddl\contrib\opensolaris\uts\common\fs\zfs\dnode_sync.c (171): error V634: The priority of the '*' operation is higher than that of the '<<' operation. It's possible that parentheses should be used in the expression. \sys\cddl\contrib\opensolaris\uts\common\fs\zfs\dnode_sync.c (175): error V547: Expression '__left >= __right' is always true. Unsigned type value is always >= 0. A couple of assertions accidentally typecast the arguments they check to unsigned in such a way that the result is always true. Also, parentheses are missing around `1<<epbs` in `(db->db_blkid * 1<<epbs)`. This works out to be okay due to multiplication not caring what order of operations we use, but it is better to fix it to be `(db->db_blkid << epbs)`. A few of the function local variables probably never should have been 32-bit in the first place, so we make them 64-bit. We also replace the existing assertions with additional assertions to ensure that 64-bit unsigned arithmetic is safe. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #14407 |
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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.
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 12.2-RELEASE.