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display project quota as user

To: xfs@xxxxxxxxxxx
Subject: display project quota as user
From: Andre Noll <maan@xxxxxxxxxxxxxxx>
Date: Wed, 14 Mar 2012 14:09:02 +0100
Cc: André C. Stiel <andre.stiel@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
Simple question: Can non-privileged users display XFS project quotas?

Currently the command

        xfs_quota -c 'quota -p 42'

fails when executed as a non-root user due to quotactl(Q_XGETQUOTA,...)
returning EPERM. The problem seems to be that fs/quota/quota.c has no
knowledge of project quotas at all.

The proof-of-concept patch below makes quotactl(Q_XGETQUOTA,...)
succeed for any user when called with type == XQM_PRJQUOTA. However,
relaxing the permission checks like this might not please everybody,
changes semantics of an existing API and adds the XFS specific constant
XQM_PRJQUOTA to fs/quota.c. So I'm not even asking to apply something
like that.

Is there a better way to allow users to display project quotas?


diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index fc2c438..010763d 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -33,7 +33,8 @@ static int check_quotactl_permission(struct super_block *sb, 
int type, int cmd,
        case Q_GETQUOTA:
        case Q_XGETQUOTA:
                if ((type == USRQUOTA && current_euid() == id) ||
-                   (type == GRPQUOTA && in_egroup_p(id)))
+                   (type == GRPQUOTA && in_egroup_p(id)) ||
+                   (type == XQM_PRJQUOTA))
The only person who always got his work done by Friday was Robinson Crusoe

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