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

[Jens Axboe]

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