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 <asm/uaccess.h>
20
21#include <linux/coda.h>
22#include <linux/coda_linux.h>
23#include <linux/coda_fs_i.h>
24#include <linux/coda_psdev.h>
25
26#include <linux/smp_lock.h>
27
28/* pioctl ops */
29static int coda_ioctl_permission(struct inode *inode, int mask);
30static long coda_pioctl(struct file *filp, unsigned int cmd,
31			unsigned long user_data);
32
33/* exported from this file */
34const struct inode_operations coda_ioctl_inode_operations = {
35	.permission	= coda_ioctl_permission,
36	.setattr	= coda_setattr,
37};
38
39const struct file_operations coda_ioctl_operations = {
40	.owner		= THIS_MODULE,
41	.unlocked_ioctl	= coda_pioctl,
42};
43
44/* the coda pioctl inode ops */
45static int coda_ioctl_permission(struct inode *inode, int mask)
46{
47	return (mask & MAY_EXEC) ? -EACCES : 0;
48}
49
50static long coda_pioctl(struct file *filp, unsigned int cmd,
51			unsigned long user_data)
52{
53	struct path path;
54	int error;
55	struct PioctlData data;
56	struct inode *inode = filp->f_dentry->d_inode;
57	struct inode *target_inode = NULL;
58	struct coda_inode_info *cnp;
59
60	lock_kernel();
61
62	/* get the Pioctl data arguments from user space */
63	if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) {
64		error = -EINVAL;
65		goto out;
66	}
67
68	/*
69	 * Look up the pathname. Note that the pathname is in
70	 * user memory, and namei takes care of this
71	 */
72	if (data.follow)
73		error = user_path(data.path, &path);
74	else
75		error = user_lpath(data.path, &path);
76
77	if (error)
78		goto out;
79	else
80		target_inode = path.dentry->d_inode;
81
82	/* return if it is not a Coda inode */
83	if (target_inode->i_sb != inode->i_sb) {
84		path_put(&path);
85		error = -EINVAL;
86		goto out;
87	}
88
89	/* now proceed to make the upcall */
90	cnp = ITOC(target_inode);
91
92	error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
93
94	path_put(&path);
95
96out:
97	unlock_kernel();
98	return error;
99}
100