linux-kernel - Re: [PATCH v2 04/17] ceph: fix compat_ioctl for ceph_dir

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Date:   Wed, 12 Sep 2018 18:25:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     David Laight <David.Laight@...lab.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        "# 3.4.x" <stable@...r.kernel.org>, Zheng Yan <zyan@...hat.com>,
        Sage Weil <sage@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        Chengguang Xu <cgxu519@....com>,
        ceph-devel <ceph-devel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 04/17] ceph: fix compat_ioctl for ceph_dir_operations

On Wed, Sep 12, 2018 at 6:10 PM David Laight <David.Laight@...lab.com> wrote:
>
> From: Arnd Bergmann
> > Sent: 12 September 2018 16:01
> >
> > The ceph_ioctl function is used both for files and directories, but only
> > the files support doing that in 32-bit compat mode.
> >
> > For consistency, add the same compat handler to the dir operations
> > as well.
>
> Have you verified that all the relevant ioctl buffer structures are
> exactly the same for 32bit and 64bit applications?

I checked it now, it's fine: there are only ceph_ioctl_dataloc
and ceph_ioctl_layout structures passed here, both of which
are compatible.

I assumed that the ceph_dir_fops operations were correct
here (they are), but you are right that I should have double
checked for more bugs as I encountered one of them.

        Arnd