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Date:	Thu, 12 Jan 2012 11:55:55 +0100
From:	Johann Lombardi <>
To:	Aditya Kali <>
Subject: Re: [PATCH v5] ext4: make quota as first class supported feature

On Wed, Jan 11, 2012 at 11:11:56AM -0800, Aditya Kali wrote:
> This patch is an attempt towards supporting quotas as first class
> feature in ext4. It is based on the proposal at:
> This patch introduces a new feature - EXT4_FEATURE_RO_COMPAT_QUOTA which, when
> turned on, enables quota accounting at mount time iteself. Also, the
> quota inodes are stored in two additional superblock fields.
> Some changes introduced by this patch that should be pointed out are:
> 1) Two new ext4-superblock fields - s_usr_quota_inum and s_grp_quota_inum
>    for storing the quota inodes in use.
> 2) Default quota inodes are: inode#3 for tracking userquota and inode#4 for
>    tracking group quota. The superblock fields can be set to use other inodes
>    as well.
> 3) If the QUOTA feature and corresponding quota inodes are set in superblock,
>    the quota usage tracking is turned on at mount time. On 'quotaon' ioctl, the
>    quota limits enforcement is turned on. 'quotaoff' ioctl turns off only the
>    limits enforcement in this case.
> 4) When QUOTA feature is in use, the quota mount options 'quota', 'usrquota',
>    'grpquota' are ignored by the kernel.
> 5) mke2fs or tune2fs can be used to set the QUOTA feature and initialize quota
>    inodes. The default reserved inodes will not be visible to user as
>    regular files.
> 6) The quota-tools will need to be modified to support hidden quota files on
>    ext4. E2fsprogs will also include support for creating and fixing quota
>    files.
> 7) Support is only for the new V2 quota file format.
> Signed-off-by: Aditya Kali <>

Looks good to me.
Reviewed-by: Johann Lombardi <>

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