linux-ext4 - Re: Question of online defrag, thanks

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Message-ID: <526F0EAA.10401@rs.jp.nec.com>
Date:	Tue, 29 Oct 2013 10:26:02 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	Ming Lei <Ming.Lei@...erbed.com>
CC:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Peng Chen <Peng.Chen@...erbed.com>
Subject: Re: Question of online defrag, thanks

Hello Ming,
 
> During running e4defrag, I am writing/reading data on file system.
> Is it safe to use e4defrag? I mean if power failure happens, is there any possibility of data loss or defragging file corruption?

# I have received same question from Peng and I already answered him. Anyway;

The journal feature and kernel internal locks protect data corruption
against power failure and R/W confliction on ext4, so you don't need to
worry about that.

For more detail about journal, please check
the following web page.

https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout#Journal_.28jbd2.29

Regards,
Akira Fujita

(2013/10/29 2:13), Ming Lei wrote:
> Hi,
> 
> I am using e4defrag to defrag running ext4 online.
> During running e4defrag, I am writing/reading data on file system.
> Is it safe to use e4defrag? I mean if power failure happens, is there any possibility of data loss or defragging file corruption?
> If there is possibility of defragging file corruption after power failure, can fsck fix it?
> 
> Thank you very much.
> Peng
> 
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