如何在linux内核中编程读取linux文件权限

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/path.h>
#include <linux/namei.h>
#include <linux/err.h>

int get_file_permission(const char* filepath) {
    struct path path;
    struct inode *inode;
    int error;
    int permission;

    // 获取文件的路径和inode
    error = kern_path(filepath, LOOKUP_FOLLOW, &path);
    if (error) {
        printk(KERN_ERR "Failed to get path: %d\n", error);
        return error;
    }
    inode = path.dentry->d_inode;

    // 获取文件的权限
    permission = inode->i_mode & S_IRWXU;

    // 打印权限信息
    printk(KERN_INFO "File permission of %s: %o\n", filepath, permission);

    // 释放资源
    path_put(&path);

    return permission;
}