https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 1795cd9b3a91d4b5473c97f491d63892442212ab authored by Linus Torvalds on 13 July 2014, 21:04:33 UTC
Linux 3.16-rc5
Linux 3.16-rc5
Tip revision: 1795cd9
pioctl.c
/*
* 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 <asm/uaccess.h>
#include <linux/coda.h>
#include <linux/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 = {
.owner = THIS_MODULE,
.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 = path.dentry->d_inode;
/* 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;
}