Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Pioctl operations for Coda. | |
1977bb2e | 3 | * Original version: (C) 1996 Peter Braam |
1da177e4 LT |
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> | |
1da177e4 LT |
22 | #include <linux/coda_psdev.h> |
23 | ||
31a203df AV |
24 | #include "coda_linux.h" |
25 | ||
1da177e4 | 26 | /* pioctl ops */ |
b74c79e9 | 27 | static int coda_ioctl_permission(struct inode *inode, int mask, unsigned int flags); |
2ff82f85 JK |
28 | static long coda_pioctl(struct file *filp, unsigned int cmd, |
29 | unsigned long user_data); | |
1da177e4 LT |
30 | |
31 | /* exported from this file */ | |
1977bb2e | 32 | const struct inode_operations coda_ioctl_inode_operations = { |
1da177e4 LT |
33 | .permission = coda_ioctl_permission, |
34 | .setattr = coda_setattr, | |
35 | }; | |
36 | ||
4b6f5d20 | 37 | const struct file_operations coda_ioctl_operations = { |
1da177e4 | 38 | .owner = THIS_MODULE, |
2ff82f85 | 39 | .unlocked_ioctl = coda_pioctl, |
6038f373 | 40 | .llseek = noop_llseek, |
1da177e4 LT |
41 | }; |
42 | ||
43 | /* the coda pioctl inode ops */ | |
b74c79e9 | 44 | static int coda_ioctl_permission(struct inode *inode, int mask, unsigned int flags) |
1da177e4 | 45 | { |
b74c79e9 NP |
46 | if (flags & IPERM_FLAG_RCU) |
47 | return -ECHILD; | |
f696a365 | 48 | return (mask & MAY_EXEC) ? -EACCES : 0; |
1da177e4 LT |
49 | } |
50 | ||
2ff82f85 JK |
51 | static long coda_pioctl(struct file *filp, unsigned int cmd, |
52 | unsigned long user_data) | |
1da177e4 | 53 | { |
2d8f3038 | 54 | struct path path; |
1977bb2e | 55 | int error; |
1da177e4 | 56 | struct PioctlData data; |
2ff82f85 | 57 | struct inode *inode = filp->f_dentry->d_inode; |
1977bb2e JK |
58 | struct inode *target_inode = NULL; |
59 | struct coda_inode_info *cnp; | |
1da177e4 | 60 | |
1977bb2e | 61 | /* get the Pioctl data arguments from user space */ |
f7cc02b8 YA |
62 | if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) |
63 | return -EINVAL; | |
1977bb2e JK |
64 | |
65 | /* | |
66 | * Look up the pathname. Note that the pathname is in | |
67 | * user memory, and namei takes care of this | |
68 | */ | |
2ff82f85 | 69 | if (data.follow) |
1977bb2e | 70 | error = user_path(data.path, &path); |
2ff82f85 | 71 | else |
1977bb2e | 72 | error = user_lpath(data.path, &path); |
2ff82f85 JK |
73 | |
74 | if (error) | |
f7cc02b8 YA |
75 | return error; |
76 | ||
77 | target_inode = path.dentry->d_inode; | |
2ff82f85 | 78 | |
1da177e4 | 79 | /* return if it is not a Coda inode */ |
1977bb2e | 80 | if (target_inode->i_sb != inode->i_sb) { |
2ff82f85 JK |
81 | error = -EINVAL; |
82 | goto out; | |
1da177e4 LT |
83 | } |
84 | ||
85 | /* now proceed to make the upcall */ | |
1977bb2e | 86 | cnp = ITOC(target_inode); |
1da177e4 LT |
87 | |
88 | error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); | |
2ff82f85 | 89 | out: |
f7cc02b8 | 90 | path_put(&path); |
1977bb2e | 91 | return error; |
1da177e4 | 92 | } |