mirror of https://gitee.com/openkylin/linux.git
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Pioctl operations for Coda.
|
|
* Original version: (C) 1996 Peter Braam
|
|
* Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
|
|
*
|
|
* Carnegie Mellon encourages users of this code to contribute improvements
|
|
* to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/time.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/module.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <linux/coda.h>
|
|
#include "coda_psdev.h"
|
|
#include "coda_linux.h"
|
|
|
|
/* pioctl ops */
|
|
static int coda_ioctl_permission(struct inode *inode, int mask);
|
|
static long coda_pioctl(struct file *filp, unsigned int cmd,
|
|
unsigned long user_data);
|
|
|
|
/* exported from this file */
|
|
const struct inode_operations coda_ioctl_inode_operations = {
|
|
.permission = coda_ioctl_permission,
|
|
.setattr = coda_setattr,
|
|
};
|
|
|
|
const struct file_operations coda_ioctl_operations = {
|
|
.unlocked_ioctl = coda_pioctl,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
/* the coda pioctl inode ops */
|
|
static int coda_ioctl_permission(struct inode *inode, int mask)
|
|
{
|
|
return (mask & MAY_EXEC) ? -EACCES : 0;
|
|
}
|
|
|
|
static long coda_pioctl(struct file *filp, unsigned int cmd,
|
|
unsigned long user_data)
|
|
{
|
|
struct path path;
|
|
int error;
|
|
struct PioctlData data;
|
|
struct inode *inode = file_inode(filp);
|
|
struct inode *target_inode = NULL;
|
|
struct coda_inode_info *cnp;
|
|
|
|
/* get the Pioctl data arguments from user space */
|
|
if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Look up the pathname. Note that the pathname is in
|
|
* user memory, and namei takes care of this
|
|
*/
|
|
if (data.follow)
|
|
error = user_path(data.path, &path);
|
|
else
|
|
error = user_lpath(data.path, &path);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
target_inode = d_inode(path.dentry);
|
|
|
|
/* return if it is not a Coda inode */
|
|
if (target_inode->i_sb != inode->i_sb) {
|
|
error = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* now proceed to make the upcall */
|
|
cnp = ITOC(target_inode);
|
|
|
|
error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
|
|
out:
|
|
path_put(&path);
|
|
return error;
|
|
}
|