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Traditionally, unused inodes would be held on the superblock inode cache until the associated on-disk file is removed or the kernel requests reclaim. On filesystems with millions of rarely-used files, this can be a lot of unusable memory. Here we implement the superblock drop_inode method, and add a zfs_delete_inode tunable to control its behaviour. By default it continues the traditional behaviour, but when the tunable is enabled, we signal that the inode should be deleted immediately when the last reference is dropped, rather than cached. This releases the associated data to the dbuf cache and ARC, allowing them to be reclaimed normally. Sponsored-by: Klara, Inc. Sponsored-by: Fastmail Pty Ltd Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #17746 |
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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.