linux-ext4 - Re: How can I flush all writes before yanking the power cable?

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Message-ID: <CADzUK1+_2FVpMfKBOBAL4Q0xYiPuOmXRBTfdO-=A=xMONOMeeQ@mail.gmail.com>
Date:	Thu, 7 Feb 2013 16:28:01 -0500
From:	Autif Khan <autif.mlist@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: How can I flush all writes before yanking the power cable?

On Thu, Feb 7, 2013 at 3:58 PM, Theodore Ts'o <tytso@....edu> wrote:
> On Thu, Feb 07, 2013 at 02:37:02PM -0500, Autif Khan wrote:
>>
>> That was precisely my ignorance. I did not know about barrier. Adding
>> it during mount ro and remount rw seems to have fixed these issues.
>
> You also didn't say what file system you were using.  Was it ext4?
> ext3?  ext2?  What kernel version?  On modern kernels barrier is
> enabled by default for both ext3 and ext4.

The filesystem is ext4. Kernel version is 3.2.0

I could not grep -i  barrier in the kernel config. How is barrier
enabled or disabled in the kernel by default?
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