linux-kernel - Re: [RFC PATCH v2] support ioctl for tunable user request

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Date:	Mon, 29 Aug 2011 19:11:18 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Lin Ming <lxy@...pku.edu.cn>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jens Axboe <jaxboe@...ionio.com>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [RFC PATCH v2] support ioctl for tunable user request

Hi

Lin Ming wrote:
> On Mon, Aug 29, 2011 at 4:15 PM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
>> This patch is added the ioctl for tunable user request.
> 
> Hi,
> 
> What's the use case for this new ioctl?
> 
In my case, this ioctl is used the background operation for eMMC.
In eMMC's case, background operation(BKOPS) is supported.
(but that is running with only card notifier, so i added new ioctl for user request)

if we send the BKOPS request, card is notified to need the BKOPS. 
then running background operation. (Then user's responsibility is done)

In future, i think that other block device should be used this ioctl.
(if supported like BKOPS)

Regard,
Jaehoon Chung

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