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

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Message-ID: <20160322185724.GA10113@infradead.org>
Date:	Tue, 22 Mar 2016 11:57:24 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...com>
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 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 :)