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

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Date:	Wed, 8 Oct 2014 10:42:51 +0200
From:	Jan Kara <jack@...e.cz>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Jan Kara <jack@...e.cz>, 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 Tue 07-10-14 13:46:20, Andreas Dilger wrote:
> 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.
  OK, QUOTA_TYPE_USR etc. looks good. I'm not so sure about named enum. I'd
be fine with named enum for USRQUOTA, GRPQUOTA, etc. - i.e., types which
should have one of the named values but for a bitmask with arbitrary
combinations of flags it looks confusing to me (although technically
it would work).

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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