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Re: xfs compat_ioctl?

To: Mark Lord <lkml@xxxxxx>
Subject: Re: xfs compat_ioctl?
From: Michael Tokarev <mjt@xxxxxxxxxx>
Date: Mon, 31 Aug 2009 16:59:55 +0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4A9BC8A6.20503@xxxxxx>
Organization: Telecom Service, JSC
References: <4A9B759B.7020401@xxxxxxxxxxxxxxxx> <20090831123010.GA2368@xxxxxxxxxxxxx> <4A9BC8A6.20503@xxxxxx>
User-agent: Mozilla-Thunderbird (X11/20090706)
Mark Lord wrote:
Christoph Hellwig wrote:
On Mon, Aug 31, 2009 at 11:02:51AM +0400, Michael Tokarev wrote:

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.


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