linux-ext4 - Re: [PATCH, RFC] Don't do page stablization if !CONFIG_BLKDEV

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Message-ID: <20120308214148.GD11861@thunk.org>
Date:	Thu, 8 Mar 2012 16:41:48 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Chris Mason <chris.mason@...cle.com>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Zach Brown <zab@...bo.net>, Eric Sandeen <sandeen@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] Don't do page stablization if
 !CONFIG_BLKDEV_INTEGRITY

On Thu, Mar 08, 2012 at 04:38:08PM -0500, Chris Mason wrote:
> Btrfs currently does this, and the DIF code is by definition right
> before the write.  The pages really only get set writeback when they are
> being sent in flight, so the waiting being done by the stable pages
> patch is file_write or page_mkwrite being polite and waiting for the IO
> to finish before changing the page.

Right before submission to the bio layer?  Or right before the device
driver sends the request to the host bus adapter?  I was thinking of
the latter....

					- Ted
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