linux-ext4 - Re: [RFC][PATCH 0/3] ext4 online defrag (ver 0.7)

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Message-Id: <47D511EC.6000908@rs.jp.nec.com>
Date:	Mon, 10 Mar 2008 19:48:12 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	cmm@...ibm.com
CC:	tytso@....edu, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/3] ext4 online defrag (ver 0.7)

Hello Mingming,

Thank you for review.  :-) 

>> Next step:
>> Remove the limit of target file size (now 128MB) in -f mode.
>> * Past mail concerning -f mode.
>> http://marc.info/?l=linux-ext4&m=118239067704899&w=4
>>
>>     
>
> The old version have many useful high level description, could you
> preserve that and add to the change logs in this updated series?
>   
All right.  I'll do so next time.


>> Dependency:
>> My patches depend on the multi-block allocation in ext4 patch queue.
>>
>>     
> mballoc patch already in maintain so this dependency could be removed.
>   
We have to set mballoc mount option for ext4 online defrag,
because it doesn't support single block allocation.
So I think ext4 online defrag depends on mballoc.


>> Summary of patches:
>> * These patches are applied on the top of
>>   ext4 git tree(linux-2.6.25-rc3-git4). 
>>   http://repo.or.cz/r/ext4-patch-queue.git
>>   And attached files are the updated patches.
>>
>>     
>
> I assume the following three patches are diffs against current ext4
> patch queue
>   
Exactly.  Sorry for the confusion.


>> [PATCH 1/3]
>>  - Interchange the data blocks of the target and
>>    temporary files in an atomic manner.
>>
>> [PATCH 2/3]
>> 　- Change the name of functions.
>> 　   ext4_ext_xxx -> ext4_defrag_xxx
>> 　- Some cleanups.
>>
>> [PATCH 3/3] ext4 online defrag command
>>  - Change the error handling for ext4_iget().
>>  - Usage is as follows:
>>    o Put the multiple files closer together.
>>      # e4defrag -r directory-name
>>    o Defrag for free space fragmentation.
>>      # e4defrag -f file-name
>>    o Defrag for a single file.
>>      # e4defrag file-name
>>    o Defrag for all files on ext4.
>>      # e4defrag device-name
>>
>> Review and comment are welcome.
>>
>>     
>
> Attempted to do so...
>
> The updated patch series could not compile one-by-one, could you rework
> the series so that in the future we could able to bi-search the ext4
> patch queue?
OK.
I'll make my updated patches to compile one-by-one
then resend them to you.


> As a whole, I got compile warning when applied all the
> updated patches:(
>   
Oops, I'll fix it.  =-O 

> review comments against the 4 updated kernel patches to follow.
>   
I am confirming your review comments. 
It will take time a little. :-) 

Regards, Akira



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