linux-kernel - Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked

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Message-ID: <20080109224026.GA4039@agk.fab.redhat.com>
Date:	Wed, 9 Jan 2008 22:40:26 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	Matt Mackall <mpm@...enic.com>,
	Paolo Ciarrocchi <paolo.ciarrocchi@...il.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, gorcunov@...il.com
Subject: Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked_ioctl

On Wed, Jan 09, 2008 at 02:12:40PM -0600, Matt Mackall wrote:
> You'll need to change the prototype, the unlocked version doesn't take
> an inode. And you'll need to make sure that nothing in the function uses
> the inode, which I think Andi forgot to mention.
 
This old chestnut again.  Perhaps we could have inode passed to unlocked_ioctl?
I never understood why it wasn't there in the first place if the plan was for
.unlocked_ioctl to supercede .ioctl whenever possible.

Device-mapper for example in dm_blk_ioctl(), has no need for BKL so drops it
immediately, but it does need the inode parameter, so it is unable to switch as
things stand.

Alasdair
-- 
agk@...hat.com
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