linux-kernel - Re: xfs compat

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Message-ID: <4A9BC94B.9050808@msgid.tls.msk.ru>
Date:	Mon, 31 Aug 2009 16:59:55 +0400
From:	Michael Tokarev <mjt@....msk.ru>
To:	Mark Lord <lkml@....ca>
CC:	Christoph Hellwig <hch@...radead.org>,
	Linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: xfs compat_ioctl?

Mark Lord wrote:
> Christoph Hellwig wrote:
>> On Mon, Aug 31, 2009 at 11:02:51AM +0400, Michael Tokarev wrote:
>>> Hello!
>>>
>>> I tried to resize an xfs filesystem on 64bit 2.6.30 kernel
>>> using 32bit userland, and that does not work, in dmesg I see:
>>>
>>> ioctl32(xfs_growfs:24426): Unknown cmd fd(3) 
>>> cmd(400c586e){t:'X';sz:12} arg(ffa56df4) on /mnt
>>> ioctl32(xfs_growfs:24427): Unknown cmd fd(3) 
>>> cmd(400c586e){t:'X';sz:12} arg(ff991254) on /mnt
>>>
>>> so apparently there's no compat_ioctl layer for these ioctls.
>>>
>>> Are there any plans to add these? :)
>>
>> Are you sure you're testing 2.6.30?  The copat ioctls were added in 
>> 2.6.28.
> 
> What command-line flags were you using, Michael ?
> 
> I just tried a simple "xfs_growfs -d" here, and it worked fine.
> This is 2.6.31-rc7-64bit on top of a 32-bit userland.

Damn.  I rebooted to 2.6.27 to test something unrelated, forgot
about it, and later tried xfs_growfs -d, which failed as per above.

And yes indeed, in 2.6.30 everything works as expected.

Please excuse me for the noise.

/mjt
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