Date:	Tue, 03 Feb 2009 15:11:00 +0800
From:	Gui Xiaohua <guixh@...fujitsu.com>
To:	Mingming Cao <cmm@...ibm.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH V5 1/5] quota: Add reservation support for delayed	block
 allocation

Hi mingming：
I have tested your patch in 2.6.29-rc1. The sum of characters which 
i had written were fewer than the block softlimit,but a warning occurs.

# edquota -u quser1
Disk quotas for user quser1 (uid 504):
  Filesystem                   blocks       soft       hard     inodes     soft     hard
  /dev/sda7                         0          5         10          0        5       10

Steps to reproduce:

# mkfs.ext4 /dev/sda7
# mount /dev/sda7 /mnt -t ext4
# setquota -u quser1 5 10 5 10 /mnt

Then log in as quser1
$ cd /mnt
$ ll
total 20
-rw------- 1 root root  7168 01-20 01:51 aquota.user
drwx------ 2 root root 12288 01-20 01:44 lost+found
$ vim dd.sh

I written some characters,such as abc,then i do wq,
the warning occurs likes below:
"dd.sh" sda7: write failed, user block limit reached.

Mingming Cao 写道:
> 在 2009-01-13二的 20:09 +0100，Jan Kara写道：
>> 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.
>>
> Sure, that works for 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.
>>
> 
> Attached are all the 5 2.6.29-rc1 based patches, including the two
> cleanups.
> 
> Thanks!
> 
> Mingming
> 
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