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When a namespace property is changed via zfs set, libzfs remounts the filesystem to propagate the new VFS mount flags. The current approach uses mount(2) with MS_REMOUNT, which reads all namespace properties from ZFS and applies them together. This has two problems: 1. Linux VFS resets unspecified per-mount flags on remount. If an administrator sets a temporary flag (e.g. mount -o remount,noatime), a subsequent zfs set on any namespace property clobbers it. 2. Two concurrent zfs set operations on different namespace properties can overwrite each other's mount flags. Additionally, legacy datasets (mountpoint=legacy) were never remounted on namespace property changes since zfs_is_mountable() returns false for them. Add zfs_mount_setattr() which uses mount_setattr(2) to selectively update only the mount flags that correspond to the changed property. For legacy datasets, /proc/mounts is iterated to update all mountpoints. On kernels without mount_setattr (ENOSYS), non-legacy datasets fall back to a full remount; legacy mounts are skipped to avoid clobbering temporary flags. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Signed-off-by: Ameer Hamza <ahamza@ixsystems.com> Closes #18257 |
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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.