UBI: add ioctl compatibility

UBI ioctl's do not work when running 64-bit kernel and 32-bit
user-land. Fix this by adding the compat_ioctl method.

Also, UBI serializes all ioctls, so more than one ioctl at a time
is not a problem. Amd UBI does not seem to depend on anything else,
so use unlocked_ioctl instead of ioctl (no BKL needed).

Reported-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index d99935c0f3c6d528f78efe1e31879bcde3ccb9ff..0a2d835fec8050917c5b6fe571060d3dd26753be 100644 (file)
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -40,6 +40,7 @@
 #include <linux/ioctl.h>
 #include <linux/capability.h>
 #include <linux/uaccess.h>
+#include <linux/compat.h>
 #include <mtd/ubi-user.h>
 #include <asm/div64.h>
 #include "ubi.h"
@@ -401,8 +402,8 @@ static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
        return count;
 }
 
-static int vol_cdev_ioctl(struct inode *inode, struct file *file,
-                         unsigned int cmd, unsigned long arg)
+static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
+                          unsigned long arg)
 {
        int err = 0;
        struct ubi_volume_desc *desc = file->private_data;
@@ -800,8 +801,8 @@ out_free:
        return err;
 }
 
-static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
-                         unsigned int cmd, unsigned long arg)
+static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
+                          unsigned long arg)
 {
        int err = 0;
        struct ubi_device *ubi;
@@ -811,7 +812,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
        if (!capable(CAP_SYS_RESOURCE))
                return -EPERM;
 
-       ubi = ubi_get_by_major(imajor(inode));
+       ubi = ubi_get_by_major(imajor(file->f_mapping->host));
        if (!ubi)
                return -ENODEV;
 
@@ -947,8 +948,8 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
        return err;
 }
 
-static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
-                          unsigned int cmd, unsigned long arg)
+static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
+                           unsigned long arg)
 {
        int err = 0;
        void __user *argp = (void __user *)arg;
@@ -1024,26 +1025,59 @@ static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
        return err;
 }
 
-/* UBI control character device operations */
-const struct file_operations ubi_ctrl_cdev_operations = {
-       .ioctl = ctrl_cdev_ioctl,
-       .owner = THIS_MODULE,
+#ifdef CONFIG_COMPAT
+static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd,
+                                 unsigned long arg)
+{
+       unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+       return vol_cdev_ioctl(file, cmd, translated_arg);
+}
+
+static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd,
+                                 unsigned long arg)
+{
+       unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+       return ubi_cdev_ioctl(file, cmd, translated_arg);
+}
+
+static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd,
+                                  unsigned long arg)
+{
+       unsigned long translated_arg = (unsigned long)compat_ptr(arg);
+
+       return ctrl_cdev_ioctl(file, cmd, translated_arg);
+}
+#else
+#define vol_cdev_compat_ioctl  NULL
+#define ubi_cdev_compat_ioctl  NULL
+#define ctrl_cdev_compat_ioctl NULL
+#endif
+
+/* UBI volume character device operations */
+const struct file_operations ubi_vol_cdev_operations = {
+       .owner          = THIS_MODULE,
+       .open           = vol_cdev_open,
+       .release        = vol_cdev_release,
+       .llseek         = vol_cdev_llseek,
+       .read           = vol_cdev_read,
+       .write          = vol_cdev_write,
+       .unlocked_ioctl = vol_cdev_ioctl,
+       .compat_ioctl   = vol_cdev_compat_ioctl,
 };
 
 /* UBI character device operations */
 const struct file_operations ubi_cdev_operations = {
-       .owner = THIS_MODULE,
-       .ioctl = ubi_cdev_ioctl,
-       .llseek = no_llseek,
+       .owner          = THIS_MODULE,
+       .llseek         = no_llseek,
+       .unlocked_ioctl = ubi_cdev_ioctl,
+       .compat_ioctl   = ubi_cdev_compat_ioctl,
 };
 
-/* UBI volume character device operations */
-const struct file_operations ubi_vol_cdev_operations = {
-       .owner   = THIS_MODULE,
-       .open    = vol_cdev_open,
-       .release = vol_cdev_release,
-       .llseek  = vol_cdev_llseek,
-       .read    = vol_cdev_read,
-       .write   = vol_cdev_write,
-       .ioctl   = vol_cdev_ioctl,
+/* UBI control character device operations */
+const struct file_operations ubi_ctrl_cdev_operations = {
+       .owner          = THIS_MODULE,
+       .unlocked_ioctl = ctrl_cdev_ioctl,
+       .compat_ioctl   = ctrl_cdev_compat_ioctl,
 };