Ext4 Quota Support

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Quota - Ext4

    https://ext4.wiki.kernel.org/index.php/Quota
    Support for the quota feature first appeared in the 3.6 upstream kernel version. There is a bug which will not be fixed until v3.8 which will cause ext4 to fail to mount a file system with quotas if the quota code is built as a module.

Design For 1st Class Quota in Ext4 - Ext4

    https://ext4.wiki.kernel.org/index.php/Design_For_1st_Class_Quota_in_Ext4
    This proposal promotes quota to being a first class supported feature in ext4. The primary difference is that user.quota and group.quota files will be hidden inodes, and will be managed directly by e2fsprogs, and quota will be enabled automatically as soon as the file system is mounted.

ext4: add project quota support [LWN.net]

    https://lwn.net/Articles/623835/
    Nov 22, 2014 · The following patches propose an implementation of project quota support for ext4. A project is an aggregate of unrelated inodes which might scatter in different directories. Inodes that belong to the same project possess an identical identification i.e. 'project ID', just like every inode has its user/group identification.

BeeGFS Wiki: Quota Support

    https://www.beegfs.io/wiki/EnableQuota
    Quota tracking is designed to generally work with any underlying local file system on the storage servers that supports user and group quota (reported through the syscall quotactl()), but has only been fully tested with ext4, XFS and ZFS.

BeeGFS Wiki: Quota Support

    http://www.beegfs.com/wiki/EnableQuota
    Quota tracking is designed to generally work with any underlying local file system on the storage servers that supports user and group quota (reported through the syscall quotactl()), but has only been fully tested with ext4, XFS and ZFS.

Implement filesystem quota for overlay2 over ext4 if it ...

    https://github.com/moby/moby/pull/34364
    @coolljt0725 getQuotaStat() is a nice addition, but it has nothing to do with adding ext4 project quota support, does it? The code for xfs project quota could just as well not be really setting project quota limits. So if you wish to add this check, please do that in a separate commit.

500231 – RFE: quota support for ext4 in RHEL5

    https://bugzilla.redhat.com/show_bug.cgi?id=500231
    Bug 500231 - RFE: quota support for ext4 in RHEL5. ... > would be really nice to have quota support for ext4 in RHEL 5.5...unable to use > ext4 otherwise :(Fixed package is scheduled for RHEL-5.6. If you want separate fix for RHEL-5.5, ask Global Support Service.

Faster Storage Statistics Android Open Source Project

    https://source.android.com/devices/storage/faster-stats
    Quota support has only been tested on ext4 and Linux 3.18 or higher. If enabling on other filesystems, or on older kernel versions, device manufacturers are responsible for testing and vetting for statistics correctness. No special hardware support is required.

ext4 - Wikipedia

    https://en.wikipedia.org/wiki/Ext4
    Support for project quotas was added in Linux kernel 4.4 on 8 Jan 2016. This feature allows assigning disk quota limits to a particular project ID. The project ID of a file is a 32-bit number stored on each file and is inherited by all files and subdirectories created beneath a …Directory contents: Linked list, hashed B-tree



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