c84670950a
Many FreeBSD disk drivers support "unmapped" I/O mode, when data buffer represented not with a virtually contiguous KVA-mapped address range, but with a list of physical memory pages. Originally it was designed to do I/O from buffers without KVA mapping (unmapped). But moving virtual addresses out of equation allows us to operate even non-contiguous data buffers with one condition: all buffer discon- tinuities must be aligned to memory page borders. Doing I/O to capable GEOM device this patch traverses through non- linear ABD buffers, validating the chunks borders. If the condition is met, it supplies GEOM with the list of original physical memory pages instead of copying the data into temporary contiguous buffer. On capable hardware on pools with ashift=12 and default ABD chunk of 4KB it should handle all the I/O without additional memory copying. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Closes #12320 |
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README.md
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.