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openzfsonwindows/openzfs#206 found that it is possible to trip `VERIFY(list_is_empty(&lwb->lwb_itxs))` when a `zil_commit()` is delayed by the scheduler long enough for a parallel `zil_suspend()` operation to exit `zil_commit_impl()`. This is a data race. To prevent this, we introduce a `zilog->zl_suspend_lock` rwlock to ensure that all outstanding `zil_commit()` operations finish before `zil_suspend()` begins and that subsequent operations fallback to `txg_wait_synced()` after `zil_suspend()` has begun. On `PREEMPT_RT` Linux kernels, the `rw_enter()` implementation suffers from writer starvation. This means that a ZIL intensive system can delay `zil_suspend()` indefinitely. This is a pre-existing problem that affects everything that uses rw locks, so it needs to be addressed in the SPL. However, builds against `PREEMPT_RT` Linux kernels are currently broken due to a GPL symbol issue (#11097), so we can safely disregard that issue for now. Reported-by: Arun KV <arun.kv@datacore.com> 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 #14514 |
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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.