openzfs/zfs

Add dirsync support

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#4366 opened on Feb 24, 2016

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Type: Featuregood first issue

Description

Add support for the Linux dirsync mount option as described in the mount(8) man page.

       dirsync
              All  directory updates within the filesystem should be done syn‐
              chronously.  This affects the  following  system  calls:  creat,
              link, unlink, symlink, mkdir, rmdir, mknod and rename.

It would be nice to support this standard Linux mount option. The most logical place to to go about this would be to extend the existing filesystem sync property to include a directory setting. Of course the downside is that this would result in a compatibility issue with the other openZFS platforms. Other solutions are definitely possible and should be investigated.

Contributor guide

Tech stack
c
Domain
data
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Linux mount optionsZFS property systemC programming
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
10
Research direction
Examine the existing 'sync' property in ZFS source code (likely in module/zfs/ and include/sys/fs/ directories). Understand how mount options are handled on Linux. Propose a design to extend the sync property with a 'directory' value, ensuring cross platform compatibility. Review comments on issue #4366 for additional context.