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Rob Norris 42b9995f88 linux/super: add tunable to request immediate reclaim of unused inodes
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
2025-09-17 16:34:09 -07:00
.github CI: Switch FreeBSD 15 to 15.0-ALPHA2 2025-09-15 12:44:05 -07:00
cmd Refactor zhack label repair and fix -c regression on nonzero TXG 2025-09-17 16:33:59 -07:00
config Shellcheck.am: add silent rules for shellcheck and checkbashisms 2025-09-17 16:33:42 -07:00
contrib Add allocation profile export and zhack subcommand for import 2025-09-10 15:01:28 -07:00
etc Add templated zfs-mount@.service 2025-07-03 14:24:07 -07:00
include Fix txg_log_time ZAP key typo 2025-09-15 12:44:01 -07:00
lib Detect a slow raidz child during reads 2025-09-10 15:31:30 -07:00
man linux/super: add tunable to request immediate reclaim of unused inodes 2025-09-17 16:34:09 -07:00
module linux/super: add tunable to request immediate reclaim of unused inodes 2025-09-17 16:34:09 -07:00
rpm cmd: rename arcstat to zarcstat 2025-09-10 15:01:20 -07:00
scripts mancheck: allow single files 2025-09-17 16:33:48 -07:00
tests Add typesets to zhack label repair test scripts 2025-09-17 16:34:04 -07:00
udev Update 69-vdev.rules.in 2025-05-21 10:05:11 -07:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Packaging: Auto-generate changelog during configure (#15528) 2023-11-16 08:58:47 -08:00
.gitmodules .gitmodules: link to openzfs github repository 2021-04-12 09:37:23 -07:00
.mailmap AUTHORS/mailmap: update with new contributors 2025-08-13 15:56:49 -07:00
AUTHORS AUTHORS/mailmap: update with new contributors 2025-08-13 15:56:49 -07:00
autogen.sh Ubuntu 22.04 integration: ShellCheck 2022-11-18 11:24:48 -08:00
CODE_OF_CONDUCT.md Documentation corrections 2022-12-22 11:34:28 -08:00
configure.ac Linux build: handle CONFIG_OBJTOOL_WERROR=y 2025-06-16 08:12:09 -07:00
copy-builtin copy-builtin: add hooks with sed/>> 2022-05-10 10:17:43 -07:00
COPYRIGHT Fix typos 2020-06-09 21:24:09 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Install zarcstat and zarcsummary symlinks in Makefile 2025-09-09 17:05:30 -07:00
META Tag 2.4.0-rc1 2025-08-22 11:27:48 -07:00
NEWS Fix NEWS file 2020-08-26 21:44:41 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md FreeBSD: remove support for FreeBSD < 13.0-RELEASE (#16372) 2024-08-05 16:56:45 -07:00
RELEASES.md Update RELEASES.md LTS release to 2.2 2025-01-17 11:04:36 -05:00
TEST Remove CI builder customization from TEST 2020-03-16 10:46:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

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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.

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Official Resources

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 META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.