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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Pioctl operations for Coda.
John Kacur1977bb22010-05-05 15:15:35 +02003 * Original version: (C) 1996 Peter Braam
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/coda_psdev.h>
23
Al Viro31a203d2011-01-12 16:36:09 -050024#include "coda_linux.h"
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026/* pioctl ops */
Al Viro10556cb2011-06-20 19:28:19 -040027static int coda_ioctl_permission(struct inode *inode, int mask);
John Kacur2ff82f82010-05-05 15:15:34 +020028static long coda_pioctl(struct file *filp, unsigned int cmd,
29 unsigned long user_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31/* exported from this file */
John Kacur1977bb22010-05-05 15:15:35 +020032const struct inode_operations coda_ioctl_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 .permission = coda_ioctl_permission,
34 .setattr = coda_setattr,
35};
36
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080037const struct file_operations coda_ioctl_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 .owner = THIS_MODULE,
John Kacur2ff82f82010-05-05 15:15:34 +020039 .unlocked_ioctl = coda_pioctl,
Arnd Bergmann6038f372010-08-15 18:52:59 +020040 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070041};
42
43/* the coda pioctl inode ops */
Al Viro10556cb2011-06-20 19:28:19 -040044static int coda_ioctl_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
Miklos Szeredif696a362008-07-31 13:41:58 +020046 return (mask & MAY_EXEC) ? -EACCES : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047}
48
John Kacur2ff82f82010-05-05 15:15:34 +020049static long coda_pioctl(struct file *filp, unsigned int cmd,
50 unsigned long user_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
Al Viro2d8f3032008-07-22 09:59:21 -040052 struct path path;
John Kacur1977bb22010-05-05 15:15:35 +020053 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct PioctlData data;
John Kacur2ff82f82010-05-05 15:15:34 +020055 struct inode *inode = filp->f_dentry->d_inode;
John Kacur1977bb22010-05-05 15:15:35 +020056 struct inode *target_inode = NULL;
57 struct coda_inode_info *cnp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
John Kacur1977bb22010-05-05 15:15:35 +020059 /* get the Pioctl data arguments from user space */
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -040060 if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
61 return -EINVAL;
John Kacur1977bb22010-05-05 15:15:35 +020062
63 /*
64 * Look up the pathname. Note that the pathname is in
65 * user memory, and namei takes care of this
66 */
John Kacur2ff82f82010-05-05 15:15:34 +020067 if (data.follow)
John Kacur1977bb22010-05-05 15:15:35 +020068 error = user_path(data.path, &path);
John Kacur2ff82f82010-05-05 15:15:34 +020069 else
John Kacur1977bb22010-05-05 15:15:35 +020070 error = user_lpath(data.path, &path);
John Kacur2ff82f82010-05-05 15:15:34 +020071
72 if (error)
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -040073 return error;
74
75 target_inode = path.dentry->d_inode;
John Kacur2ff82f82010-05-05 15:15:34 +020076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 /* return if it is not a Coda inode */
John Kacur1977bb22010-05-05 15:15:35 +020078 if (target_inode->i_sb != inode->i_sb) {
John Kacur2ff82f82010-05-05 15:15:34 +020079 error = -EINVAL;
80 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 }
82
83 /* now proceed to make the upcall */
John Kacur1977bb22010-05-05 15:15:35 +020084 cnp = ITOC(target_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
John Kacur2ff82f82010-05-05 15:15:34 +020087out:
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -040088 path_put(&path);
John Kacur1977bb22010-05-05 15:15:35 +020089 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090}