From: ebiederm@xmission.com (Eric W. Biederman)
To: Jan Kara <jack@suse.cz>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
"Serge E. Hallyn" <serge@hallyn.com>,
David Miller <davem@davemloft.net>,
Steven Whitehouse <swhiteho@redhat.com>,
Mark Fasheh <mfasheh@suse.com>, Joel Becker <jlbec@evilplan.org>,
Ben Myers <bpm@sgi.com>, Alex Elder <elder@kernel.org>,
Dmitry Monakhov <dmonakhov@openvz.org>,
Abhijith Das <adas@redhat.com>
Subject: Re: [PATCH] userns: Add basic quota support v2
Date: Tue, 28 Aug 2012 10:34:04 -0700 [thread overview]
Message-ID: <87a9xe7wfn.fsf@xmission.com> (raw)
In-Reply-To: <20120828090544.GC5146@quack.suse.cz> (Jan Kara's message of "Tue, 28 Aug 2012 11:05:44 +0200")
Jan Kara <jack@suse.cz> writes:
> On Mon 27-08-12 17:12:16, Eric W. Biederman wrote:
>> Add the data type struct qown which holds the owning identifier of a
>> quota. struct qown is a replacement for the implicit union of uid,
>> gid and project stored in an unsigned int and the quota type field
>> that is was used in the quota data structures. Making the data type
>> explicit allows the kuid_t and kgid_t type safety to propogate more
>> thoroughly through the code, revealing more places where uid/gid
>> conversions need be made.
>>
>> Allong with the data type struct qown comes the helper functions
> ^^^^ Along
>
>> qown_eq, qown_lt, from_qown, from_qown_munged, qown_valid, make_qown,
>> make_qown_invalid, make_qown_uid, make_qown_gid.
>>
>> Replace struct dquot dq_id and dq_type with dq_own a struct qown.
>>
>> Update the signature of dqget, quota_send_warning, dquot_get_dqblk,
>> and dquot_set_dqblk to use struct qown.
>>
>> Make minimal changes to ext3, ext4, gfs2, ocfs2, and xfs to deal with
>> the change in quota structures and signatures. The ocfs2 changes are
>> larger than most because of the extensive tracing throughout the ocfs2
>> quota code that prints out dq_id.
>>
>> v2:
>> - Renamed qown_t struct qown
>> - Added the quota type to struct qown.
>> - Removed enum quota_type (In this patch it was just noise)
>> - Added qown_lt, make_qown_invalid, make_qown_uid, make_qown_gid
>> - Taught qown to handle xfs project ids (but only in init_user_ns).
>> Q_XGETQUOTA calls .get_quotblk with project ids.
> Just a couple one minor comments below...
>
>> @@ -130,13 +130,17 @@ static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src)
>> static int quota_getquota(struct super_block *sb, int type, qid_t id,
>> void __user *addr)
>> {
>> + struct qown qown;
>> struct fs_disk_quota fdq;
>> struct if_dqblk idq;
>> int ret;
>>
>> if (!sb->s_qcop->get_dqblk)
>> return -ENOSYS;
>> - ret = sb->s_qcop->get_dqblk(sb, type, id, &fdq);
>> + qown = make_qown(current_user_ns(), type, id);
>> + if (qown_valid(qown))
> ^ missing '!'
Good catch thank you.
>> + return -EINVAL;
>> + ret = sb->s_qcop->get_dqblk(sb, qown, &fdq);
>> if (ret)
>> return ret;
>> copy_to_if_dqblk(&idq, &fdq);
> ...
>> +static inline u32 from_qown(struct user_namespace *user_ns, struct qown qown)
>> +{
>> + switch (qown.type) {
>> + case USRQUOTA:
>> + return from_kuid(user_ns, qown.uid);
>> + case GRPQUOTA:
>> + return from_kgid(user_ns, qown.gid);
>> + case XQM_PRJQUOTA:
>> + return (user_ns == &init_user_ns) ? qown.prj : -1;
>> + default:
>> + BUG();
>> + }
>> +}
> I would like a bit more if the function somehow expressed in its name
> that it returns id. id_from_qown() might be a bit too long given how often
> it is used. qown2id() would be OK but it would be inconsistent with how
> names of other functions you've added are formed. So I'm somewhat
> undecided...
The qown vs id distinction bothers me a little bit.
I almost want to name it struct kid, and the functions make_kid,
from_kid etc. Where the emphasis is that we are transforming in and out
of the kernel internal form. I don't really like make_kid because id as
a base name seems to generic and it barely tells you it is. Perhaps
make_kqid. Where we call the quota ids and qid for short?
I am a little uncomfortable calling them kqids because the userspace
code also places format_ids in a plain qid_t. But make_kqid and
from_kqid seems the best alternate set of names I can come up with.
Eric
next prev parent reply other threads:[~2012-08-28 17:34 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-25 23:54 [REVIEW][PATCH 0/15] userns subsystem conversions Eric W. Biederman
2012-08-25 23:58 ` [REVIEW][PATCH 01/15] userns: Enable building of pf_key sockets when user namespace support is enabled Eric W. Biederman
2012-08-25 23:59 ` [REVIEW][PATCH 02/15] userns: Make credential debugging user namespace safe Eric W. Biederman
2012-08-25 23:59 ` [REVIEW][PATCH 03/15] userns: Convert security/keys to the new userns infrastructure Eric W. Biederman
2012-08-26 0:00 ` [REVIEW][PATCH 04/15] userns: net: Call key_alloc with GLOBAL_ROOT_UID, GLOBAL_ROOT_GID instead of 0, 0 Eric W. Biederman
2012-08-26 0:00 ` [REVIEW][PATCH 05/15] userns: Convert ipc to use kuid and kgid where appropriate Eric W. Biederman
2012-08-26 0:01 ` [REVIEW][PATCH 07/15] userns: Convert taskstats to handle the user and pid namespaces Eric W. Biederman
2012-08-26 0:02 ` [REVIEW][PATCH 09/15] userns: Convert process event connector to handle kuids and kgids Eric W. Biederman
2012-08-26 12:33 ` Evgeniy Polyakov
2012-08-26 13:43 ` Eric W. Biederman
2012-08-26 0:03 ` [REVIEW][PATCH 10/15] userns: Convert debugfs to use kuid/kgid where appropriate Eric W. Biederman
2012-09-05 21:09 ` Greg Kroah-Hartman
2012-08-26 0:04 ` [REVIEW][PATCH 11/15] userns: Teach trace to use from_kuid Eric W. Biederman
2012-08-26 0:18 ` Steven Rostedt
2012-08-26 0:28 ` Eric W. Biederman
2012-08-26 0:05 ` [REVIEW][PATCH 12/15] userns: Convert drm to use kuid and kgid and struct pid where appropriate Eric W. Biederman
2012-09-13 1:31 ` Dave Airlie
2012-09-13 2:14 ` Eric W. Biederman
2012-09-13 3:29 ` Dave Airlie
2012-08-26 0:07 ` [REVIEW][PATCH 15/15] userns: Convert configfs to use kuid and kgid " Eric W. Biederman
2012-08-26 13:00 ` [PATCH 06/15] userns: Convert audit " Eric W. Biederman
[not found] ` <9E0E8AAC-9548-4009-AE29-D368244D8EEA@dubeyko.com>
2012-08-26 14:25 ` [REVIEW][PATCH 0/15] userns subsystem conversions Eric W. Biederman
[not found] ` <87harqecvk.fsf@xmission.com>
2012-08-27 8:50 ` [REVIEW][PATCH 13/15] userns: Add basic quota support Jan Kara
2012-08-27 15:54 ` Eric W. Biederman
2012-08-28 0:12 ` [PATCH] userns: Add basic quota support v2 Eric W. Biederman
2012-08-28 9:05 ` Jan Kara
2012-08-28 9:44 ` Boaz Harrosh
2012-08-28 17:34 ` Eric W. Biederman [this message]
2012-08-28 17:36 ` [PATCH] userns: Add basic quota support v3 Eric W. Biederman
2012-08-28 17:51 ` [PATCH] userns: Add basic quota support v2 Jan Kara
2012-08-28 19:09 ` [PATCH] userns: Add basic quota support v4 Eric W. Biederman
2012-08-29 2:10 ` Dave Chinner
2012-08-29 9:31 ` Eric W. Biederman
2012-08-31 1:17 ` Dave Chinner
2012-09-05 5:20 ` Eric W. Biederman
2012-09-20 1:28 ` Eric W. Biederman
2012-08-27 8:58 ` [REVIEW][PATCH 13/15] userns: Add basic quota support Steven Whitehouse
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