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Date:	Tue, 12 Apr 2011 00:40:18 -0400
From:	Christoph Hellwig <>
To:	Ted Ts'o <>
Cc:	Christoph Hellwig <>,
	Mark Busheman <>,
Subject: Re: Does ext4 send FUA to flush disk cache

On Mon, Apr 11, 2011 at 10:14:23PM -0400, Ted Ts'o wrote:
> Ah, Jens pushed a patch that I hadn't noticed that appears to
> optionally use FUA for the commit block.  Thanks for pointing that
> out.

The commits actually are from Tejun:

commit 797e7dbbee0a91fa1349192f18ad5c454997d876
Author: Tejun Heo <>
Date:   Fri Jan 6 09:51:03 2006 +0100

    [BLOCK] reimplement handling of barrier request

    Reimplement handling of barrier requests.
     * Flexible handling to deal with various capabilities of
       target devices.
     * Retry support for falling back.
     * Tagged queues which don't support ordered tag can do ordered.
    Signed-off-by: Tejun Heo <>
    Signed-off-by: Jens Axboe <>

commit 007365ad60387df30f02f01fdc2b6e6432f6c265
Author: Tejun Heo <>
Date:   Fri Jan 6 09:53:52 2006 +0100

    [BLOCK] scsi: add FUA support to sd

    Add FUA support for barriers to SCSI disk.

    Signed-off-by: Tejun Heo <>
    Signed-off-by: Jens Axboe <>

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