Deprecation Warning for Quota (enable quota feature)

teoberi · 03-16-2024, 10:10 AM

Code:

quotaon -v /home

Quote:

quotaon: Your kernel probably supports ext4 quota feature but you are using external quota files. Please switch your filesystem to use ext4 quota feature as external quota files on ext4 are deprecated. You can enable the feature by unmounting the file system and running 'tune2fs -O quota <device>'.

The same message appears at boot (at the execution of rc.M).

Detailed information for fixing here and here.
Tested on Slackware64-current:
1. turning file system quotas off
2. move the files aquota.user (aquota.group) to /tmp
3. execute the procedure from the second link
It works, but it conflicts a bit with the section

Quote:

# Slackware-Mini-Quota-HOWTO:

from /etc/rc.d/rc.M because quotacheck will generate an error message.
Another problem would be the fact that it checks if the mounting options are set (grep -q quota /etc/fstab), so they must remain, although in this case they are ignored.
Quote from ext4 man page:

Quote:

usrjquota=aquota.user|grpjquota=aquota.group
For journaled quotas (jqfmt=vfsv0 or jqfmt=vfsv1), the
mount options usrjquota=aquota.user and
grpjquota=aquota.group are required to tell the quota
system which quota database files to use. When the quota
file system feature is enabled, journaled quotas are used
automatically, and this mount option is ignored.

hazel · 03-17-2024, 03:01 AM

See also https://www.linuxquestions.org/quest...as-4175685865/.

teoberi · 03-17-2024, 05:14 AM

Quote:

Originally Posted by hazel

See also https://www.linuxquestions.org/quest...as-4175685865/.

See, I wrote this.

teoberi · 03-17-2024, 05:22 AM

Until our BDFL makes a decision (if it thinks it is the case) I will not touch rc.M, but I will delete the mount options from /etc/fstab and add if blocks to enable and disable quota in /etc/rc.local and /etc/rc.local_shutdown

teoberi · 03-20-2024, 05:19 AM

Some information to substantiate the option regarding the quota feature!
https://opensource.com/article/18/4/ext4-filesystem

Quote:

First-class quota support
Wait, quotas?! We've had those since the ext2 days! Yes, but they've always been an afterthought, and they've always kinda sucked. It's probably not worth going into the hairy details here, but the design document lays out the ways quotas will be moved from userspace into the kernel and more correctly and performantly enforced.

https://ext4.wiki.kernel.org/index.p..._Quota_in_Ext4
The document is interesting both for the technical explanations and the FAQ part.