linux-ext4 - Re: [PATCH V5 1/5] quota: Add reservation support for delayed block allocation

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Message-ID: <20090113190931.GI10064@duck.suse.cz>
Date:	Tue, 13 Jan 2009 20:09:31 +0100
From:	Jan Kara <jack@...e.cz>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, tytso <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH V5 1/5] quota: Add reservation support for delayed
	block allocation

On Tue 13-01-09 10:53:17, Mingming Cao wrote:
> 在 2009-01-13二的 16:37 +0100，Jan Kara写道：
> > On Mon 12-01-09 16:19:06, Mingming Cao wrote:
> > > Thanks for your review and suggestions. All points are taken. I have
> > > updated the quota patches.I am attaching the updated patch here just for
> > > your review.
> > > 
> > > I am waiting for the ext4 tree to updated to rebase the whole series
> > > against 2.6.29-rc1 plus ext4 patch queue.  
> > > 
> >   <snip>
> > > Quota: Add quota reservation support
> > > 
> > > Delayed allocation defers the block allocation at the dirty pages
> > > flush-out time, doing quota charge/check at that time is too late.
> > > But we can't charge the quota blocks until blocks are really allocated,
> > > otherwise users could get overcharged after reboot from system crash.
> > > 
> > > This patch adds quota reservation for delayed llocation. Quota blocks
> > > are reserved in memory, inode and quota won't gets dirtied until later
> > > block allocation time.
> > > 
> > > Signed-off-by: Mingming Cao <cmm@...ibm.com>
> >   The patch is fine. You can add
> > 
> >   Acked-by: Jan Kara <jack@...e.cz>
> > 
> >   How do you want to merge the patches? Via ext4 patch queue?
> > There's one generic quota patch that I also need to push to fix some OCFS2
> > issue and it collides with your patchset. And also there're further
> > cleanups in quota code which are long overdue which I want to base on all
> > other patches. So I've decided to setup quota git tree. I'll pull in your
> > two VFS quota patches. Will that work for you?
> 
> I think a quota tree is the best place to hold all these quota changes.
> The ext4 part probably make sense to stay together with the vfs changes,
> but it will need to coordinate with Ted's ext4 tree.  Ted, what do you
> think?
  Yes. The best would be if could pull quota changes from my tree but you
could also just carry your two patches and only leave merging them with
vanilla to me.

> BTW, there are other two quota cleanup patches that you have already
> acked. I will sent the 2.6.29-rc1 based version.
  Yes. Thanks.

> >   The tree should be soon at:
> > git.kernel.org/pub/scm/linux/kernel/git/jack/linux-quota-2.6.git
> >   The branch you can pull from is for_next (or for_mm if there'll be
> > some more long term experimental stuff but I'm not aware of anything like
> > that now).

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