linux-kernel - Re: [PATCH 07/10] fs: make generic file read/write functions plug

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Date:	Wed, 9 Mar 2011 05:38:28 -0500
From:	"hch@...radead.org" <hch@...radead.org>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	"hch@...radead.org" <hch@...radead.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/10] fs: make generic file read/write functions plug

On Tue, Mar 08, 2011 at 01:38:08PM +0100, Jens Axboe wrote:
> -#define DP_UNPLUG             8 /* equals REQ_UNPLUG  */
> +#define DP_UNPLUG             8 /* not used anymore   */

The way this is used might need some more review.  It seems like DRBD is
trying to propagate unplug requests over the wire, which is
functionality we lose now.

> + * The various wait functions, such as wait_on_writeback_range() will
> + * ultimately call sync_page() which will ultimately call
> + * blk_run_backing_dev(), which will end up unplugging the device queue.

This comment describes code that doesn't exist anymore on your branch.

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