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Commit | Line | Data |
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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> | |
22 | #include <linux/coda_linux.h> | |
23 | #include <linux/coda_fs_i.h> | |
24 | #include <linux/coda_psdev.h> | |
25 | ||
2ff82f85 JK |
26 | #include <linux/smp_lock.h> |
27 | ||
1da177e4 | 28 | /* pioctl ops */ |
e6305c43 | 29 | static int coda_ioctl_permission(struct inode *inode, int mask); |
2ff82f85 JK |
30 | static long coda_pioctl(struct file *filp, unsigned int cmd, |
31 | unsigned long user_data); | |
1da177e4 LT |
32 | |
33 | /* exported from this file */ | |
1977bb2e | 34 | const struct inode_operations coda_ioctl_inode_operations = { |
1da177e4 LT |
35 | .permission = coda_ioctl_permission, |
36 | .setattr = coda_setattr, | |
37 | }; | |
38 | ||
4b6f5d20 | 39 | const struct file_operations coda_ioctl_operations = { |
1da177e4 | 40 | .owner = THIS_MODULE, |
2ff82f85 | 41 | .unlocked_ioctl = coda_pioctl, |
1da177e4 LT |
42 | }; |
43 | ||
44 | /* the coda pioctl inode ops */ | |
e6305c43 | 45 | static int coda_ioctl_permission(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; |
2ff82f85 | 56 | struct inode *inode = filp->f_dentry->d_inode; |
1977bb2e JK |
57 | struct inode *target_inode = NULL; |
58 | struct coda_inode_info *cnp; | |
1da177e4 | 59 | |
2ff82f85 JK |
60 | lock_kernel(); |
61 | ||
1977bb2e JK |
62 | /* get the Pioctl data arguments from user space */ |
63 | if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) { | |
2ff82f85 JK |
64 | error = -EINVAL; |
65 | goto out; | |
1da177e4 | 66 | } |
1977bb2e JK |
67 | |
68 | /* | |
69 | * Look up the pathname. Note that the pathname is in | |
70 | * user memory, and namei takes care of this | |
71 | */ | |
2ff82f85 | 72 | if (data.follow) |
1977bb2e | 73 | error = user_path(data.path, &path); |
2ff82f85 | 74 | else |
1977bb2e | 75 | error = user_lpath(data.path, &path); |
2ff82f85 JK |
76 | |
77 | if (error) | |
78 | goto out; | |
79 | else | |
2d8f3038 | 80 | target_inode = path.dentry->d_inode; |
2ff82f85 | 81 | |
1da177e4 | 82 | /* return if it is not a Coda inode */ |
1977bb2e | 83 | if (target_inode->i_sb != inode->i_sb) { |
2d8f3038 | 84 | path_put(&path); |
2ff82f85 JK |
85 | error = -EINVAL; |
86 | goto out; | |
1da177e4 LT |
87 | } |
88 | ||
89 | /* now proceed to make the upcall */ | |
1977bb2e | 90 | cnp = ITOC(target_inode); |
1da177e4 LT |
91 | |
92 | error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data); | |
93 | ||
2d8f3038 | 94 | path_put(&path); |
2ff82f85 JK |
95 | |
96 | out: | |
97 | unlock_kernel(); | |
1977bb2e | 98 | return error; |
1da177e4 | 99 | } |