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Andrew Walker 312bdab0f5
Add handling for STATX_CHANGE_COOKIE 
This commit adds handling for the STATX_CHANGE_COOKIE so that
we can properly surface the ZFS znode sequence to NFS clients via
knfsd.

If knfsd does not have STATX_CHANGE_COOKIE in statx result then
it will synthesize the NFS change_info4 structure and related
change4id values algorithmically based on the ctime value of the
file. Since internally ZFS is using ktime_get_coarse_real_ts64()
for the timestamp calculation here it introduces the possiblity
that the change will not increment the change4id of directories
/ files causing a failure in the client to invalidate its attr
cache (among other things). See RFC 8881 Section 10.8 for
discussion of how clients may implement name and directory
caching.

Notable in this commit is that we are not initializing the
inode->i_version to the znode->z_seq number. The reason for this
is that we're intentionally not setting `SB_I_VERSION`. This
indicates that the filesystem manages its own i_version and
so it is not populated in the generic_fillattr.

The following compares tight loop of setattr over NFSv4
protocol while traching nfsd4_change_attribute.

Before change:
inode, change_attribute
4723, 7590032215978780890
4723, 7590032215978780890
4723, 7590032215978780890
4723, 7590032215982780865
4723, 7590032215982780865

After change:
inode, change_attribute
7602, 7590032992517123951
7602, 7590032992517123952
7602, 7590032992517123953
7602, 7590032992517123954
7602, 7590032992517123955

Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Andrew Walker <andrew.walker@truenas.com>
Closes #18097
2026-01-05 14:06:28 -08:00
.github CI: Add Alpine Linux 3.23 runner to the pipeline (#18087) 2025-12-30 09:29:48 -08:00
cmd cmd/zfs: clone: accept -u to not mount newly created datasets 2026-01-05 12:21:56 -05:00
config Linux 6.19: replace i_state access with inode_state_read_once() 2025-12-23 12:53:32 -08:00
contrib zed.d, contrib: fix shellcheck errors in scripts 2025-12-23 11:12:21 -08:00
etc Replace bashisms in ZFS shell function stub. 2025-12-16 09:15:51 -08:00
include kmem: don't add __GFP_COMP for KM_VMEM allocations 2025-12-23 12:54:34 -08:00
lib u8_textprep: move into module/zfs 2025-12-22 14:58:36 -08:00
man cmd/zfs: clone: accept -u to not mount newly created datasets 2026-01-05 12:21:56 -05:00
module Add handling for STATX_CHANGE_COOKIE 2026-01-05 14:06:28 -08:00
rpm libuutil: remove packaging 2025-11-17 06:23:17 -08:00
scripts Change shellcheck and checkbashism triggers. 2025-12-16 09:15:51 -08:00
tests cmd/zfs: clone: accept -u to not mount newly created datasets 2026-01-05 12:21:56 -05:00
udev zvol_id: make array length properly known at compile time 2025-12-01 10:19:40 -08:00
.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 mailmap/AUTHORS: update with recent new contributors 2025-10-22 09:27:54 -07:00
AUTHORS mailmap/AUTHORS: update with recent new contributors 2025-10-22 09:27:54 -07:00
autogen.sh autogen.sh: remove workaround for automake <1.14, needed for EL <=7 2025-10-30 16:26:56 -07:00
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 2025-09-05 10:00:48 -07:00
META Linux 6.18 compat: META (#18039) 2025-12-10 09:04:24 -08:00
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 Fix capitalization typo in README.md 2025-11-03 16:37:58 -08:00
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

README.md

img

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.