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Message-Id: <200901151734.23870.arnd@arndb.de>
Date: Thu, 15 Jan 2009 17:34:23 +0100
From: Arnd Bergmann <arnd@...db.de>
To: dedekind@...radead.org
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
linux-mtd <linux-mtd@...ts.infradead.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] UBI: add ioctl compatibility
On Thursday 15 January 2009, Artem Bityutskiy wrote:
> would you please glance if this patch all-right?
No, it's not. New ioctl numbers should not be added to fs/compat_ioctl.c
but rather to the file that implements the file operations (ubi/cdev.c).
The best way to do it would be to add functions that do
static long compat_vol_cdev_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
int ret;
arg = (unsigned long)compat_ptr(arg);
lock_kernel();
ret = vol_cdev_locked_ioctl(file->f_inode, file, cmd, arg);
unlock_kernel();
return ret;
}
static long vol_cdev_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
int ret;
lock_kernel();
ret = vol_cdev_locked_ioctl(file->f_inode, file, cmd, arg);
unlock_kernel();
return ret;
}
and then use these two functions as your unlocked_ioctl and compat_ioctl
methods in file_operations.
If you can prove that you don't rely on the BKL, you can also drop the
{un,}lock_kernel() calls.
> COMPATIBLE_IOCTL(MEMGETREGIONINFO)
> COMPATIBLE_IOCTL(MEMGETBADBLOCK)
> COMPATIBLE_IOCTL(MEMSETBADBLOCK)
> +/* UBI */
> +COMPATIBLE_IOCTL(UBI_IOCMKVOL)
> +ULONG_IOCTL(UBI_IOCRMVOL)
> +COMPATIBLE_IOCTL(UBI_IOCRSVOL)
> +COMPATIBLE_IOCTL(UBI_IOCRNVOL)
> +COMPATIBLE_IOCTL(UBI_IOCATT)
> +ULONG_IOCTL(UBI_IOCDET)
> +ULONG_IOCTL(UBI_IOCVOLUP)
> +ULONG_IOCTL(UBI_IOCEBER)
> +ULONG_IOCTL(UBI_IOCEBCH)
> +ULONG_IOCTL(UBI_IOCEBMAP)
> +ULONG_IOCTL(UBI_IOCEBUNMAP)
> +ULONG_IOCTL(UBI_IOCEBISMAP)
ULONG_IOCTL() would be wrong here, all your ioctl handlers expect
a pointer, not an unsigned long
Arnd <><
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