linux-kernel - Re: [PATCH 4/5] block: make blkdev_get/put() handle exclusive access

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Date:	Tue, 09 Nov 2010 11:18:05 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kara <jack@...e.cz>
CC:	axboe@...nel.dk, hch@...radead.org, linux-kernel@...r.kernel.org,
	petero2@...ia.com, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, akpm@...ux-foundation.org,
	adilger.kernel@...ger.ca, tytso@....edu, mfasheh@...e.com,
	joel.becker@...cle.com, aelder@....com, dm-devel@...hat.com,
	drbd-dev@...ts.linbit.com, neilb@...e.de, leochen@...adcom.com,
	sbranden@...adcom.com, chris.mason@...cle.com, swhiteho@...hat.com,
	shaggy@...ux.vnet.ibm.com, joern@...fs.org,
	konishi.ryusuke@....ntt.co.jp, reiserfs-devel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH 4/5] block: make blkdev_get/put() handle exclusive access

Hello,

On 11/03/2010 04:06 PM, Jan Kara wrote:
> On Mon 01-11-10 17:15:28, Tejun Heo wrote:
>   The patch looks OK to me as far as ext3, ext4, and reiserfs are
> concerned. One thing I wondered about when I looked at it - does someone
> use the 'mode' argument of the blkdev_put() function (well, apart from the
> exclusive flag)? Because I've looked at a few random disk ->release()
> functions and none of them used it...

Yeah, I thought about removing @mode and make blkdev_put() take
@holder for exclusive releases.  From what I can see, it doesn't seem
like any implementation cares but it's customary to have access to
@mode on ->release(), so I decided to keep it.  It's rather flaky as
there's no mechanism to check or enforce it tho.

Thanks.

-- 
tejun
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