linux-kernel - Re: [RFC v2 4/5] mm/swapfile: refcount block and queue before using blkcg_schedule

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Message-ID: <5001fb4f-28b8-26b1-fc66-11b3105b15b9@acm.org>
Date:   Thu, 9 Apr 2020 20:02:59 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Luis Chamberlain <mcgrof@...nel.org>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, gregkh@...uxfoundation.org,
        rostedt@...dmis.org, mingo@...hat.com, jack@...e.cz,
        ming.lei@...hat.com, nstange@...e.de, akpm@...ux-foundation.org
Cc:     mhocko@...e.com, yukuai3@...wei.com, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Omar Sandoval <osandov@...com>,
        Hannes Reinecke <hare@...e.com>,
        Michal Hocko <mhocko@...nel.org>
Subject: Re: [RFC v2 4/5] mm/swapfile: refcount block and queue before using
 blkcg_schedule_throttle()

On 2020-04-09 14:45, Luis Chamberlain wrote:
>  		if (si->bdev) {
> +			bdev = bdgrab(si->bdev);
> +			if (!bdev)
> +				continue;
> +			/*
> +			 * By adding our own bdgrab() we ensure the queue
> +			 * sticks around until disk_release(), and so we ensure
> +			 * our release of the request_queue does not happen in
> +			 * atomic context.
> +			 */
>  			blkcg_schedule_throttle(bdev_get_queue(si->bdev),
>  						true);

How about changing the si->bdev argument of blkcg_schedule_throttle()
into bdev?

Thanks,

Bart.