linux-kernel - Re: aio: compat

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Message-ID: <x497hpm8p69.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 08 Mar 2010 16:43:42 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	linux-aio@...ck.org, Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: aio: compat_ioctl issue?

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

> Hello.
>
> I just come across a situation (next in a long row :)
> when on x86, 32bit userspace does not work with 64bit
> kernel.  This time this is about aio requests.
>
> An application submits some aio job, and it is returned
> immediately (from io_getevents()) with EINVAL error.
> Here's what it does (it's a printf in the application -
> actual arguments as passed to io_submit() and actual
> result received in io_getevents()):
>
> io_submit: lio_opcode=7 reqprio=0 iov=0x9cd7018{0xf5599000,4096}, niov=1, offset=0
> io_getevents: expected 4096 got -22 (EINVAL)
>
> Note that it is not io_submit() which fails (that one
> returns success) but io_getevents(), so it has to be
> down the pipeline somewhere.
>
> Can someone comment this please?  Somehow I was thinking this
> codepath works as - I think anyway - I ran 32bit Oracle database
> with aio support on 64bit kernel, but I may be mistaken.
>
> Kernel is 2.6.33 from kernel.org.

Can you post the program, please?

Thanks,
Jeff
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