1/*
 2 * Pioctl operations for Coda.
 3 * Original version: (C) 1996 Peter Braam
 4 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
 5 *
 6 * Carnegie Mellon encourages users of this code to contribute improvements
 7 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
 8 */
 9
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/time.h>
13#include <linux/fs.h>
14#include <linux/stat.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include <linux/namei.h>
18#include <linux/module.h>
19#include <linux/uaccess.h>
20
21#include <linux/coda.h>
22#include <linux/coda_psdev.h>
23
24#include "coda_linux.h"
25
26/* pioctl ops */
27static int coda_ioctl_permission(struct inode *inode, int mask);
28static long coda_pioctl(struct file *filp, unsigned int cmd,
29			unsigned long user_data);
30
31/* exported from this file */
32const struct inode_operations coda_ioctl_inode_operations = {
33	.permission	= coda_ioctl_permission,
34	.setattr	= coda_setattr,
35};
36
37const struct file_operations coda_ioctl_operations = {
38	.unlocked_ioctl	= coda_pioctl,
39	.llseek		= noop_llseek,
40};
41
42/* the coda pioctl inode ops */
43static int coda_ioctl_permission(struct inode *inode, int mask)
44{
45	return (mask & MAY_EXEC) ? -EACCES : 0;
46}
47
48static long coda_pioctl(struct file *filp, unsigned int cmd,
49			unsigned long user_data)
50{
51	struct path path;
52	int error;
53	struct PioctlData data;
54	struct inode *inode = file_inode(filp);
55	struct inode *target_inode = NULL;
56	struct coda_inode_info *cnp;
57
58	/* get the Pioctl data arguments from user space */
59	if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
60		return -EINVAL;
61
62	/*
63	 * Look up the pathname. Note that the pathname is in
64	 * user memory, and namei takes care of this
65	 */
66	if (data.follow)
67		error = user_path(data.path, &path);
68	else
69		error = user_lpath(data.path, &path);
70
71	if (error)
72		return error;
73
74	target_inode = d_inode(path.dentry);
75
76	/* return if it is not a Coda inode */
77	if (target_inode->i_sb != inode->i_sb) {
78		error = -EINVAL;
79		goto out;
80	}
81
82	/* now proceed to make the upcall */
83	cnp = ITOC(target_inode);
84
85	error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
86out:
87	path_put(&path);
88	return error;
89}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Pioctl operations for Coda.
 4 * Original version: (C) 1996 Peter Braam
 5 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
 6 *
 7 * Carnegie Mellon encourages users of this code to contribute improvements
 8 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
 9 */
10
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/time.h>
14#include <linux/fs.h>
15#include <linux/stat.h>
16#include <linux/errno.h>
17#include <linux/string.h>
18#include <linux/namei.h>
19#include <linux/module.h>
20#include <linux/uaccess.h>
21
22#include <linux/coda.h>
23#include "coda_psdev.h"
 
24#include "coda_linux.h"
25
26/* pioctl ops */
27static int coda_ioctl_permission(struct inode *inode, int mask);
28static long coda_pioctl(struct file *filp, unsigned int cmd,
29			unsigned long user_data);
30
31/* exported from this file */
32const struct inode_operations coda_ioctl_inode_operations = {
33	.permission	= coda_ioctl_permission,
34	.setattr	= coda_setattr,
35};
36
37const struct file_operations coda_ioctl_operations = {
38	.unlocked_ioctl	= coda_pioctl,
39	.llseek		= noop_llseek,
40};
41
42/* the coda pioctl inode ops */
43static int coda_ioctl_permission(struct inode *inode, int mask)
44{
45	return (mask & MAY_EXEC) ? -EACCES : 0;
46}
47
48static long coda_pioctl(struct file *filp, unsigned int cmd,
49			unsigned long user_data)
50{
51	struct path path;
52	int error;
53	struct PioctlData data;
54	struct inode *inode = file_inode(filp);
55	struct inode *target_inode = NULL;
56	struct coda_inode_info *cnp;
57
58	/* get the Pioctl data arguments from user space */
59	if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
60		return -EINVAL;
61
62	/*
63	 * Look up the pathname. Note that the pathname is in
64	 * user memory, and namei takes care of this
65	 */
66	error = user_path_at(AT_FDCWD, data.path,
67			     data.follow ? LOOKUP_FOLLOW : 0, &path);
 
 
 
68	if (error)
69		return error;
70
71	target_inode = d_inode(path.dentry);
72
73	/* return if it is not a Coda inode */
74	if (target_inode->i_sb != inode->i_sb) {
75		error = -EINVAL;
76		goto out;
77	}
78
79	/* now proceed to make the upcall */
80	cnp = ITOC(target_inode);
81
82	error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
83out:
84	path_put(&path);
85	return error;
86}