From: Dmitry Monakhov <dmonakhov@openvz.org>
To: Jan Kara <jack@suse.cz>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 2/3] quota: introduce get_id callback
Date: Wed, 03 Feb 2010 08:38:15 +0300 [thread overview]
Message-ID: <874olyg9q0.fsf@openvz.org> (raw)
In-Reply-To: <20100202160509.GI7056@quack.suse.cz> (Jan Kara's message of "Tue, 2 Feb 2010 17:05:09 +0100")
Jan Kara <jack@suse.cz> writes:
> On Tue 02-02-10 18:00:24, Dmitry Monakhov wrote:
>> During some quota oparations we have to determine quota_id for given inode
>> according to quota_type. But only USRQUOTA/GRPQUOTA id are intermediately
>> accessible from generic vfs-inode. This patch introduce new per_sb quota
>> operation for this purpose.
> Hmm, but you do not intend to ever change what is returned for USRQUOTA
> and GRPQUOTA, do you? So we could just have something like
Hmm... In fact i've considered this option. For example:
In case of containers(trees), each container administrator want
user/group quota to work inside it's container. I've considered
following approach:
1) enlarge qid_t to u64
2) encode quota_uid and group_uid like follows:
quid = treeid << 32 + uid
qgid = treeid << 32 + gid
3) Introduce new 64-bit quota format file to support wide qid_t.
Currently i dont know better way to support user/group quota
inside tree. It does not affect old fs-internal code, just replace
all hard-coded (int => u64) in fs/quota-XXX. Old 32-bit quota users
not affected because qid_t will be shrink ed on quota-save for
old(most of) users.
next prev parent reply other threads:[~2010-02-03 5:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-02 15:00 [PATCH 0/3] quota: RFC add extend quota types Dmitry Monakhov
2010-02-02 15:00 ` [PATCH 1/3] quota: generalize quota transfer interface Dmitry Monakhov
2010-02-02 15:00 ` [PATCH 2/3] quota: introduce get_id callback Dmitry Monakhov
2010-02-02 15:00 ` [PATCH 3/3] quota: add generic treeid quota support Dmitry Monakhov
2010-02-02 16:10 ` Jan Kara
2010-02-02 16:05 ` [PATCH 2/3] quota: introduce get_id callback Jan Kara
2010-02-03 5:38 ` Dmitry Monakhov [this message]
2010-02-03 10:47 ` Jan Kara
2010-02-03 19:54 ` Dmitry Monakhov
2010-02-02 15:48 ` [PATCH 1/3] quota: generalize quota transfer interface Jan Kara
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