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Commit | Line | Data |
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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 */ | |
27 | static int coda_ioctl_permission(struct inode *inode, int mask); | |
28 | static long coda_pioctl(struct file *filp, unsigned int cmd, | |
29 | unsigned long user_data); | |
30 | ||
31 | /* exported from this file */ | |
32 | const struct inode_operations coda_ioctl_inode_operations = { | |
33 | .permission = coda_ioctl_permission, | |
34 | .setattr = coda_setattr, | |
35 | }; | |
36 | ||
37 | const struct file_operations coda_ioctl_operations = { | |
38 | .unlocked_ioctl = coda_pioctl, | |
39 | .llseek = noop_llseek, | |
40 | }; | |
41 | ||
42 | /* the coda pioctl inode ops */ | |
43 | static int coda_ioctl_permission(struct inode *inode, int mask) | |
44 | { | |
45 | return (mask & MAY_EXEC) ? -EACCES : 0; | |
46 | } | |
47 | ||
48 | static 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); | |
86 | out: | |
87 | path_put(&path); | |
88 | return error; | |
89 | } |