fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / fs / coda / pioctl.c
blob2bf3026adc803065c02e1a80912cc0b2ffe7e266
1 /*
2 * Pioctl operations for Coda.
3 * Original version: (C) 1996 Peter Braam
4 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
6 * Carnegie Mellon encourages users of this code to contribute improvements
7 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
8 */
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>
21 #include <linux/coda.h>
22 #include <linux/coda_linux.h>
23 #include <linux/coda_fs_i.h>
24 #include <linux/coda_psdev.h>
26 /* pioctl ops */
27 static int coda_ioctl_permission(struct inode *inode, int mask,
28 struct nameidata *nd);
29 static int coda_pioctl(struct inode * inode, struct file * filp,
30 unsigned int cmd, unsigned long user_data);
32 /* exported from this file */
33 const struct inode_operations coda_ioctl_inode_operations =
35 .permission = coda_ioctl_permission,
36 .setattr = coda_setattr,
39 const struct file_operations coda_ioctl_operations = {
40 .owner = THIS_MODULE,
41 .ioctl = coda_pioctl,
44 /* the coda pioctl inode ops */
45 static int coda_ioctl_permission(struct inode *inode, int mask,
46 struct nameidata *nd)
48 return 0;
51 static int coda_pioctl(struct inode * inode, struct file * filp,
52 unsigned int cmd, unsigned long user_data)
54 struct nameidata nd;
55 int error;
56 struct PioctlData data;
57 struct inode *target_inode = NULL;
58 struct coda_inode_info *cnp;
60 /* get the Pioctl data arguments from user space */
61 if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) {
62 return -EINVAL;
65 /*
66 * Look up the pathname. Note that the pathname is in
67 * user memory, and namei takes care of this
69 if ( data.follow ) {
70 error = user_path_walk(data.path, &nd);
71 } else {
72 error = user_path_walk_link(data.path, &nd);
75 if ( error ) {
76 return error;
77 } else {
78 target_inode = nd.dentry->d_inode;
81 /* return if it is not a Coda inode */
82 if ( target_inode->i_sb != inode->i_sb ) {
83 path_release(&nd);
84 return -EINVAL;
87 /* now proceed to make the upcall */
88 cnp = ITOC(target_inode);
90 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
92 path_release(&nd);
93 return error;