linux-ext4 - Re: Add EXT4_IOC

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Date:	Tue, 12 Jun 2007 15:21:15 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andreas Dilger <adilger@...sterfs.com>
CC:	linux-ext4@...r.kernel.org, Takashi Sato <sho@...s.nec.co.jp>
Subject: Re: Add EXT4_IOC_MIGRATE ioctl

Andreas Dilger wrote:
> On Jun 12, 2007  12:17 +0530, Aneesh Kumar K.V wrote:
>> The below patch add ioctl for migrating ext3 indirect block mapped inode
>> to ext4 extent mapped inode.
> 
> How does this relate to the migrate ioctl used by Takashi in the current
> ext4 defragmenter patch series?  

You mean EXT4_IOC_DEFRAG ?.  I guess the last version of defragmentation 
patches (ver4) handled only extent mapped inode.

Ideally, the code shouldn't really care
> whether it is migrating from/to a block-mapped or extent-mapped file.
> 
>

As per the last discussion with Takashi the defragmentation is going to 
work on extent mapped file only. The plan right now is to convert a 
block mapped inode to extent mapped inode and then defrag. Later we 
update the user space tool to issue two ioctl if the user wanted to 
defrag a block mapped inode. There will also be a separate command line 
option to just migrate.

-aneesh
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