linux-ext4 - Re: [PATCH 03/12] xfs: Set allowed quota types

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Message-Id: <3391F66C-E2A7-4FC8-8696-3C1600D54DA9@dilger.ca>
Date:	Tue, 7 Oct 2014 13:46:20 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Jan Kara <jack@...e.cz>
Cc:	Dave Chinner <david@...morbit.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	xfs@....sgi.com, cluster-devel <cluster-devel@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com,
	reiserfs-devel@...r.kernel.org, Jeff Mahoney <jeffm@...e.de>,
	Dave Kleikamp <shaggy@...nel.org>,
	jfs-discussion@...ts.sourceforge.net, tytso@....edu
Subject: Re: [PATCH 03/12] xfs: Set allowed quota types

On Oct 7, 2014, at 1:29 PM, Jan Kara <jack@...e.cz> wrote:
> On Tue 07-10-14 07:30:28, Dave Chinner wrote:
>> On Wed, Oct 01, 2014 at 09:31:25PM +0200, Jan Kara wrote:
>>> We support user, group, and project quotas. Tell VFS about it.
>>> 
>>> CC: xfs@....sgi.com
>>> CC: Dave Chinner <david@...morbit.com>
>>> Signed-off-by: Jan Kara <jack@...e.cz>
>>> ---
>>> fs/xfs/xfs_super.c | 2 ++
>>> 1 file changed, 2 insertions(+)
>>> 
>>> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
>>> index b194652033cd..b32e998e8cbc 100644
>>> --- a/fs/xfs/xfs_super.c
>>> +++ b/fs/xfs/xfs_super.c
>>> @@ -1419,6 +1419,8 @@ xfs_fs_fill_super(
>>> 	sb->s_export_op = &xfs_export_operations;
>>> #ifdef CONFIG_XFS_QUOTA
>>> 	sb->s_qcop = &xfs_quotactl_operations;
>>> +	sb->s_dquot.allowed_types = (1 << USRQUOTA) | (1 << GRPQUOTA) |
>>> +				    (1 << PRJQUOTA);
>> 
>> Would it be better to define masks for these rather than open
>> coding these shifts everywhere?
>  I can do that. Any suggestion for a name? I was thinking about it for a
> while and couldn't come up with anything satisfactory...

Better to have QUOTA at the start, and TYPE in the name, so maybe:

enum quota_types {
	QUOTA_TYPE_USR = 1 << USRQUOTA,
	QUOTA_TYPE_GRP = 1 << GRPQUOTA,
	QUOTA_TYPE_PRJ = 1 << PRJQUOTA,
};

or maybe "enum quota_type_mask" or similar.

I prefer named enums over #defines since this makes it more clear
when declaring variables like "allowed_types" what valid values are
instead of just "int" that someone might mistakenly set to USRQUOTA
directly or something.

Cheers, Andreas






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