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When doing a manual TRIM on a zpool, the metaslab being TRIMmed is potentially re-enabled before all queued TRIM zios for that metaslab have completed. Since TRIM zios have the lowest priority, it is possible to get into a situation where allocations occur from the just re-enabled metaslab and cut ahead of queued TRIMs to the same metaslab. If the ranges overlap, this will cause corruption. We were able to trigger this pretty consistently with a small single top-level vdev zpool (i.e. small number of metaslabs) with heavy parallel write activity while performing a manual TRIM against a somewhat 'slow' device (so TRIMs took a bit of time to complete). With the patch, we've not been able to recreate it since. It was on illumos, but inspection of the OpenZFS trim code looks like the relevant pieces are largely unchanged and so it appears it would be vulnerable to the same issue. Reviewed-by: Igor Kozhukhov <igor@dilos.org> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Jason King <jking@racktopsystems.com> Illumos-issue: https://www.illumos.org/issues/15939 Closes #15395 |
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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.