linux-kernel - Re: [PATCH 2/2] block: defer the use of inline biovecs for discard requests

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Date:	Mon, 28 Jun 2010 14:34:14 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	Christoph Hellwig <hch@....de>, dm-devel@...hat.com,
	James.Bottomley@...e.de, linux-kernel@...r.kernel.org,
	martin.petersen@...cle.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 2/2] block: defer the use of inline biovecs for discard
 requests

On 2010-06-26 21:56, Mike Snitzer wrote:
> Don't alloc discard bio with a biovec in blkdev_issue_discard.  Doing so
> means bio_has_data() will not be true until the SCSI layer adds the
> payload to the discard request via blk_add_request_payload.

Sorry, this looks horrible. What is the point of this?!

> bio_{enable,disable}_inline_vecs are not expected to be widely used so
> they were exported using EXPORT_SYMBOL_GPL.

Never export anything that doesn't have an in-kernel modular user.

> This patch avoids the need for the following VM accounting fix for
> discards: http://lkml.org/lkml/2010/6/23/361
> NOTE: Jens, you said you applied Tao Ma's fix but I cannot see it in
> your linux-2.6-block's for-next or for-2.6.36... as such I didn't revert
> it in this patch.

It's in the for-linus branch, that is stuff headed for the current
kernel.

-- 
Jens Axboe

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