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A question in the context of independent pquota

To: XFS Mailing List <xfs@xxxxxxxxxxx>
Subject: A question in the context of independent pquota
From: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Date: Thu, 20 Oct 2011 18:02:26 -0500
Organization: IBM
Reply-to: sekharan@xxxxxxxxxx
Hi All,

Few days back I posted a patchset to allow pquota and gquota to be used
together. I have a question in that context.

In order for the user space to get the stats for pguota and gquota
together (quotactl command Q_XGETQSTAT), I need to add a field to
fs_quota_stat. So, I have to change the version number.

But, the version number is only set in the kernel and not checked. Which
means the kernel cannot know what size of the fs_quota_stat data
structure the user space has provided in order to decide if the kernel
can copy the newer (bigger) data structure to the user space or not.

One option I see is to add a new command to the ioctl.

Is there any other options ? ( or am I totally missing it :) ?



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