On Wed, May 22, 2019 at 12:05:30PM +0800, sunqiuyang wrote:
> +static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg)
> +{
> + struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
> + __u64 block_count;
> + int ret;
> +
> + if (!capable(CAP_SYS_ADMIN))
> + return -EPERM;
> +
> + if (f2fs_readonly(sbi->sb))
> + return -EROFS;
> +
> + if (copy_from_user(&block_count, (__u64 __user *)arg, sizeof(__u64)))
> + return -EFAULT;
You can just call get_user() here.
