linux-kernel - Re: [PATCH v3 11/26] ceph: fix compat_ioctl for ceph_dir

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Date:   Wed, 17 Apr 2019 22:23:12 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-fsdevel@...r.kernel.org, y2038@...ts.linaro.org,
        linux-kernel@...r.kernel.org, "Yan, Zheng" <zyan@...hat.com>,
        stable@...r.kernel.org, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>, ceph-devel@...r.kernel.org
Subject: Re: [PATCH v3 11/26] ceph: fix compat_ioctl for ceph_dir_operations

On Tue, Apr 16, 2019 at 10:19:49PM +0200, Arnd Bergmann wrote:
> 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.
> 
> Reviewed-by: "Yan, Zheng" <zyan@...hat.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  fs/ceph/dir.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
> index a8f429882249..7c060cb22aa3 100644
> --- a/fs/ceph/dir.c
> +++ b/fs/ceph/dir.c
> @@ -1785,6 +1785,7 @@ const struct file_operations ceph_dir_fops = {
>  	.open = ceph_open,
>  	.release = ceph_release,
>  	.unlocked_ioctl = ceph_ioctl,
> +	.compat_ioctl = ceph_ioctl,

Again, broken on s390 (and so's the ceph_file_ops, of course).
It wants compat_ptr() applied to argument...