linux-kernel - Re: [PATCH 3/6] block: add ability to flag write back caching on a device

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Message-ID: <56F19621.4000909@fb.com>
Date:	Tue, 22 Mar 2016 12:59:45 -0600
From:	Jens Axboe <axboe@...com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-block@...r.kernel.org>
Subject: Re: [PATCH 3/6] block: add ability to flag write back caching on a
 device

On 03/22/2016 12:57 PM, Christoph Hellwig wrote:
> On Tue, Mar 22, 2016 at 11:55:17AM -0600, Jens Axboe wrote:
>> Add an internal helper and flag for setting whether a queue has
>> write back caching, or write through (or none). Add a sysfs file
>> to show this as well, and make it changeable from user space.
>
> We do this by passing the REQ_FLUSH flag to blk_queue_flush today.
> While that's not a great interface, adding a second one doesn't make it
> any better :)

I think the newer one is cleaner, so would make more sense to put the 
flush part on top.


-- 
Jens Axboe