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The previous patch #14841 appeared to have significant flaw, causing deadlocks if zl_get_data callback got blocked waiting for TXG sync. I already handled some of such cases in the original patch, but issue #14982 shown cases that were impossible to solve in that design. This patch fixes the problem by postponing log blocks allocation till the very end, just before the zios issue, leaving nothing blocking after that point to cause deadlocks. Before that point though any sleeps are now allowed, not causing sync thread blockage. This require slightly more complicated lwb state machine to allocate blocks and issue zios in proper order. But with removal of special early issue workarounds the new code is much cleaner now, and should even be more efficient. Since this patch uses null zios between write, I've found that null zios do not wait for logical children ready status in zio_ready(), that makes parent write to proceed prematurely, producing incorrect log blocks. Added ZIO_CHILD_LOGICAL_BIT to zio_wait_for_children() fixes it. Reviewed-by: Rob Norris <rob.norris@klarasystems.com> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Reviewed-by: George Wilson <george.wilson@delphix.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15122 |
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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.