linux-kernel - Re: 2.6.23-rc1-mm1

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Date:	Mon, 30 Jul 2007 20:42:03 +0200
From:	Christoph Hellwig <hch@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dave Young <hidave.darkstar@...il.com>,
	Grant Wilson <grant.wilson@....co.uk>,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: 2.6.23-rc1-mm1

On Mon, Jul 30, 2007 at 11:27:20AM -0700, Andrew Morton wrote:
> ho hum, crap.  Yes, ioctl_by_bdev() doesn't have a file* and so it makes
> unlocked_ioctl() rather tricky.  We could cook up a `struct file' on the
> stack (we do that in various places), but that sucks.
> 
> Christoph, have you any clever suggestions?

There's two ways to deal with it, one ugly and quick and one to do it
right.

The quick hack is to fake up a file struct similar to blkdev_get().

The proper solutions is to get rid of the file (and inode) in the
blockdev ->ioctl prototype.  Only thing keeping is from that is
floppy.c (and some cut & paste variants for m68k) due to their awkard
permission checking hacks.

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