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With the advent of fast dedup, there are no longer separate dedup tables for different copies values. There is now logic that will add DVAs to the dedup table entry if more copies are needed for new writes. However, this interacts poorly with ganging. There are two different cases that can result in mixed gang/non-gang BPs, which are illegal in ZFS. This change modifies updates of existing FDT; if there are already gang DVAs in the FDT, we prevent the new write from extending the DDT entry. We cannot safely mix different gang trees in one block pointer. if there are non-gang DVAs in the FDT, then this allocation may not be gangs. If it would gang, we have to redo the whole write as a non-dedup write. This change also fixes a refcount leak that could occur if the lead DDT write failed. Sponsored by: iXsystems, Inc. Sponsored-by: Klara, Inc. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com> Closes: #17123 |
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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 13.0-RELEASE.