ocfs2: Implement compat_ioctl()

We need this to support 32 bit system calls on 64 bit kernels.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/ioctl.h

@@ -12,5 +12,6 @@
 
 int ocfs2_ioctl(struct inode * inode, struct file * filp,
 	unsigned int cmd, unsigned long arg);
+long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg);
 
 #endif /* OCFS2_IOCTL_H */