linux-kernel - Re: compat ioctl32 for /dev/snapshot?

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Message-ID: <20090710162105.GA1469@ucw.cz>
Date:	Fri, 10 Jul 2009 18:21:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: compat ioctl32 for /dev/snapshot?

On Mon 2009-05-04 13:29:22, Michael Tokarev wrote:
> Is there any reason why 32-bit uswsusp &Friends does not work
> on 64bits kernel?
>
> For one, 32bits s2disk produces the following when trying to
> suspend:
>
>  ioctl32(s2disk:4134): Unknown cmd fd(4) cmd(400c330d){t:'3';sz:12} arg(ff853554) on /dev/snapshot
>  ioctl32(s2disk:4134): Unknown cmd fd(4) cmd(4004330a){t:'3';sz:4} arg(00000805) on /dev/snapshot
>
> this is coming from:
>
>     error = ioctl(dev, SNAPSHOT_SET_SWAP_AREA, &swap);
>     if (error && !offset)
>             error = ioctl(dev, SNAPSHOT_SET_SWAP_FILE, blkdev);
>
> but I guess (just guess!) that other SNAPSHOT_* operations will
> also fail the same way.
>
> Is there a reason why those are not in compat_ioctl?

Lazyness...?

Patch would be welcome. On 4GB machine, running 64bit kernel (but
staying with 32bit userland) makes sense...


								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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