blob: 127714936c666f5fc97e4d68927a68e3d0ae6726 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/* pioctl ops */
27static int coda_ioctl_permission(struct inode *inode, int mask,
28 struct nameidata *nd);
29static int coda_pioctl(struct inode * inode, struct file * filp,
30 unsigned int cmd, unsigned long user_data);
31
32/* exported from this file */
33struct inode_operations coda_ioctl_inode_operations =
34{
35 .permission = coda_ioctl_permission,
36 .setattr = coda_setattr,
37};
38
39struct file_operations coda_ioctl_operations = {
40 .owner = THIS_MODULE,
41 .ioctl = coda_pioctl,
42};
43
44/* the coda pioctl inode ops */
45static int coda_ioctl_permission(struct inode *inode, int mask,
46 struct nameidata *nd)
47{
48 return 0;
49}
50
51static int coda_pioctl(struct inode * inode, struct file * filp,
52 unsigned int cmd, unsigned long user_data)
53{
54 struct nameidata nd;
55 int error;
56 struct PioctlData data;
57 struct inode *target_inode = NULL;
58 struct coda_inode_info *cnp;
59
60 /* get the Pioctl data arguments from user space */
61 if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) {
62 return -EINVAL;
63 }
64
65 /*
66 * Look up the pathname. Note that the pathname is in
67 * user memory, and namei takes care of this
68 */
69 if ( data.follow ) {
70 error = user_path_walk(data.path, &nd);
71 } else {
72 error = user_path_walk_link(data.path, &nd);
73 }
74
75 if ( error ) {
76 return error;
77 } else {
78 target_inode = nd.dentry->d_inode;
79 }
80
81 /* return if it is not a Coda inode */
82 if ( target_inode->i_sb != inode->i_sb ) {
83 path_release(&nd);
84 return -EINVAL;
85 }
86
87 /* now proceed to make the upcall */
88 cnp = ITOC(target_inode);
89
90 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
91
92 path_release(&nd);
93 return error;
94}
95