From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@lst.de>
Cc: Dave Kleikamp <shaggy@kernel.org>,
jfs-discussion@lists.sourceforge.net, Jan Kara <jack@suse.cz>,
Jeff Mahoney <jeffm@suse.de>, Mark Fasheh <mfasheh@suse.com>,
reiserfs-devel@vger.kernel.org, xfs@oss.sgi.com,
cluster-devel@redhat.com, Joel Becker <jlbec@evilplan.org>,
linux-fsdevel@vger.kernel.org, tytso@mit.edu,
linux-ext4@vger.kernel.org,
Steven Whitehouse <swhiteho@redhat.com>,
ocfs2-devel@oss.oracle.com, viro@zeniv.linux.org.uk
Subject: Re: [PATCH 02/12] quota: Allow each filesystem to specify which quota types it supports
Date: Wed, 22 Oct 2014 18:51:50 +0200 [thread overview]
Message-ID: <20141022165150.GA12809@quack.suse.cz> (raw)
In-Reply-To: <20141022162915.GB18443@lst.de>
On Wed 22-10-14 18:29:15, Christoph Hellwig wrote:
> On Tue, Oct 21, 2014 at 04:38:26PM +0200, Jan Kara wrote:
> > Currently all filesystems supporting VFS quota support user and group
> > quotas. With introduction of project quotas this is going to change so
> > make sure filesystem isn't called for quota type it doesn't support by
> > introduction of a bitmask determining which quota types each filesystem
> > supports.
>
> Why don't you keep this bitmask in the dquot.c instead of pushing it
> to the caller? So far usage of s_dquot is mostly confined to dquot.c
> (with a few leaks to the filesystems using it), so keeping it that
> way seems like a good idea.
So there are two reasons:
1) Currently if you call quotactl() with invalid quota type you'll get
EINVAL. To maintain this with addition of project quotas you need to check
the types early before calling check_quotactl_permission() and other
checks.
2) I didn't want filesystem quotactl callbacks to deal with quota types
they don't support. Sure each fs could do a type check in the callback but
this looked easier.
Now I see your point about s_dquot and I can move allowed_types out of
s_dquot if that makes you happier. But otherwise what I did still seems as
the best solution to me.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
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next prev parent reply other threads:[~2014-10-22 16:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-21 14:38 [PATCH 0/12 v3] Moving i_dquot out of struct inode Jan Kara
2014-10-21 14:38 ` [PATCH 01/12] quota: Remove const from function declarations Jan Kara
2014-10-21 14:38 ` [PATCH 02/12] quota: Allow each filesystem to specify which quota types it supports Jan Kara
2014-10-22 16:29 ` Christoph Hellwig
2014-10-22 16:51 ` Jan Kara [this message]
2014-10-23 8:53 ` Christoph Hellwig
2014-10-21 14:38 ` [PATCH 03/12] gfs2: Set allowed quota types Jan Kara
2014-10-21 14:38 ` [PATCH 04/12] xfs: " Jan Kara
2014-10-21 14:38 ` [PATCH 05/12] quota: Use function to provide i_dquot pointers Jan Kara
2014-10-21 14:38 ` [PATCH 06/12] ext2: Convert to private i_dquot field Jan Kara
2014-10-21 14:38 ` [PATCH 07/12] ext3: " Jan Kara
2014-10-21 14:38 ` [PATCH 08/12] ext4: " Jan Kara
2014-10-21 14:38 ` [PATCH 09/12] ocfs2: " Jan Kara
2014-10-23 10:25 ` Joel Becker
2014-10-23 12:05 ` Jan Kara
2014-10-21 14:38 ` [PATCH 10/12] reiserfs: " Jan Kara
2014-10-21 14:38 ` [PATCH 11/12] jfs: " Jan Kara
2014-10-21 14:38 ` [PATCH 12/12] vfs: Remove i_dquot field from inode Jan Kara
-- strict thread matches above, loose matches on Subject: below --
2014-11-04 11:19 [PATCH 0/12 v4] Moving i_dquot out of struct inode Jan Kara
2014-11-04 11:19 ` [PATCH 02/12] quota: Allow each filesystem to specify which quota types it supports Jan Kara
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