From: Arnd Bergmann <arnd@arndb.de>
To: Johannes Stezenbach <js@sig21.net>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: missing compat-ioctl for CDROM_DRIVE_STATUS + FDGETPRM
Date: Wed, 29 Jun 2011 14:30:42 +0200 [thread overview]
Message-ID: <201106291430.43102.arnd@arndb.de> (raw)
In-Reply-To: <20110629113834.GA4227@sig21.net>
On Wednesday 29 June 2011, Johannes Stezenbach wrote:
> Sorry for very slow reply. I think qemu's use of these ioctls
> to probe if the device is a cdrom or floppy is valid, so instead
> of adding a stat() call to check for block device in qemu, I think
> it is better to silence the warning in the kernel.
Well, correct or not, it will keep causing annoying messages on
old kernels, so why not do both?
> Do I get it right that just adding two IGNORE_IOCTL() to
> the ioctl_pointer array in linux/fs/compat_ioctl.c is sufficient,
> like in commit 3f001711?
Yes.
> I.e. these ioctls are handled for block devices earlier
> in compat_sys_ioctl()?
Right. We always first ask the driver, and then search the lookup table
when the driver does not know how to handle it in compat mode.
Arnd
next prev parent reply other threads:[~2011-06-29 12:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-17 9:04 missing compat-ioctl for CDROM_DRIVE_STATUS + FDGETPRM Johannes Stezenbach
2011-06-17 13:02 ` Arnd Bergmann
2011-06-29 11:38 ` Johannes Stezenbach
2011-06-29 12:30 ` Arnd Bergmann [this message]
2011-06-29 12:51 ` Johannes Stezenbach
2011-06-29 15:09 ` Johannes Stezenbach
2011-06-29 15:36 ` Arnd Bergmann
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