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

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Date:	Mon, 04 May 2009 11:35:43 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: compat ioctl32 for /dev/snapshot?

Michael Tokarev <mjt@....msk.ru> writes:

> 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?

It's probably just that nobody has written the code yet. In general all
missing compat_ioctls are bugs.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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