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

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Date:	Wed, 9 Jan 2008 15:31:00 -0800
From:	Vadim Lobanov <vlobanov@...akeasy.net>
To:	Alasdair G Kergon <agk@...hat.com>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Mackall <mpm@...enic.com>,
	Paolo Ciarrocchi <paolo.ciarrocchi@...il.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	gorcunov@...il.com
Subject: Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked_ioctl

On Wednesday 09 January 2008 03:05:45 pm Alasdair G Kergon wrote:
> On Wed, Jan 09, 2008 at 04:58:46PM -0600, Chris Friesen wrote:
> > Alasdair G Kergon wrote:
> > >On Wed, Jan 09, 2008 at 11:46:03PM +0100, Andi Kleen wrote:
> > >>struct inode *inode = file->f_dentry->d_inode;
> > >
> > >And oops if that's not defined?
> >
> > Isn't this basically identical to what was being passed in to .ioctl()?
>
> Not in every case, unless someone's been through and created fake
> structures in all the remaining places that pass in a NULL 'file' because
> there isn't one available.

>From 2.6.23's fs/ioctl.c - do_ioctl():

        if (filp->f_op->unlocked_ioctl) {
                error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
                if (error == -ENOIOCTLCMD)
                        error = -EINVAL;
                goto out;
        } else if (filp->f_op->ioctl) {
                lock_kernel();
                error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
                                          filp, cmd, arg);
                unlock_kernel();
        }

As a sidenote, please don't use f_dentry and f_vfsmnt, since they are just 
#defines for the correct fields. They were meant to be temporary transition 
helpers, but (alas) have refused to die thus far. If noone beats me to it, 
I'll take a look-see at deprecating them all the way.

-- Vadim Lobanov
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