Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Pioctl operations for Coda. | |
1977bb2e | 4 | * Original version: (C) 1996 Peter Braam |
1da177e4 LT |
5 | * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University |
6 | * | |
7 | * Carnegie Mellon encourages users of this code to contribute improvements | |
8 | * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/time.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/stat.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/namei.h> | |
19 | #include <linux/module.h> | |
834b46c3 | 20 | #include <linux/uaccess.h> |
1da177e4 LT |
21 | |
22 | #include <linux/coda.h> | |
8fc8b9df | 23 | #include "coda_psdev.h" |
31a203df AV |
24 | #include "coda_linux.h" |
25 | ||
1da177e4 | 26 | /* pioctl ops */ |
4609e1f1 | 27 | static int coda_ioctl_permission(struct mnt_idmap *idmap, |
549c7297 | 28 | struct inode *inode, int mask); |
2ff82f85 JK |
29 | static long coda_pioctl(struct file *filp, unsigned int cmd, |
30 | unsigned long user_data); | |
1da177e4 LT |
31 | |
32 | /* exported from this file */ | |
1977bb2e | 33 | const struct inode_operations coda_ioctl_inode_operations = { |
1da177e4 LT |
34 | .permission = coda_ioctl_permission, |
35 | .setattr = coda_setattr, | |
36 | }; | |
37 | ||
4b6f5d20 | 38 | const struct file_operations coda_ioctl_operations = { |
2ff82f85 | 39 | .unlocked_ioctl = coda_pioctl, |
6038f373 | 40 | .llseek = noop_llseek, |
1da177e4 LT |
41 | }; |
42 | ||
43 | /* the coda pioctl inode ops */ | |
4609e1f1 | 44 | static int coda_ioctl_permission(struct mnt_idmap *idmap, |
549c7297 | 45 | struct inode *inode, int mask) |
1da177e4 | 46 | { |
f696a365 | 47 | return (mask & MAY_EXEC) ? -EACCES : 0; |
1da177e4 LT |
48 | } |
49 | ||
2ff82f85 JK |
50 | static long coda_pioctl(struct file *filp, unsigned int cmd, |
51 | unsigned long user_data) | |
1da177e4 | 52 | { |
2d8f3038 | 53 | struct path path; |
1977bb2e | 54 | int error; |
1da177e4 | 55 | struct PioctlData data; |
496ad9aa | 56 | struct inode *inode = file_inode(filp); |
1977bb2e JK |
57 | struct inode *target_inode = NULL; |
58 | struct coda_inode_info *cnp; | |
1da177e4 | 59 | |
1977bb2e | 60 | /* get the Pioctl data arguments from user space */ |
f7cc02b8 YA |
61 | if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) |
62 | return -EINVAL; | |
1977bb2e JK |
63 | |
64 | /* | |
65 | * Look up the pathname. Note that the pathname is in | |
66 | * user memory, and namei takes care of this | |
67 | */ | |
ce6595a2 AV |
68 | error = user_path_at(AT_FDCWD, data.path, |
69 | data.follow ? LOOKUP_FOLLOW : 0, &path); | |
2ff82f85 | 70 | if (error) |
f7cc02b8 YA |
71 | return error; |
72 | ||
2b0143b5 | 73 | target_inode = d_inode(path.dentry); |
2ff82f85 | 74 | |
1da177e4 | 75 | /* return if it is not a Coda inode */ |
1977bb2e | 76 | if (target_inode->i_sb != inode->i_sb) { |
2ff82f85 JK |
77 | error = -EINVAL; |
78 | goto out; | |
1da177e4 LT |
79 | } |
80 | ||
81 | /* now proceed to make the upcall */ | |
1977bb2e | 82 | cnp = ITOC(target_inode); |
1da177e4 LT |
83 | |
84 | error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); | |
2ff82f85 | 85 | out: |
f7cc02b8 | 86 | path_put(&path); |
1977bb2e | 87 | return error; |
1da177e4 | 88 | } |