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1// SPDX-License-Identifier: GPL-2.02/*3 * Pioctl operations for Coda.4 * Original version: (C) 1996 Peter Braam5 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University6 *7 * Carnegie Mellon encourages users of this code to contribute improvements8 * 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>20#include <linux/uaccess.h>21 22#include <linux/coda.h>23#include "coda_psdev.h"24#include "coda_linux.h"25 26/* pioctl ops */27static int coda_ioctl_permission(struct mnt_idmap *idmap,28 struct inode *inode, int mask);29static long coda_pioctl(struct file *filp, unsigned int cmd,30 unsigned long user_data);31 32/* exported from this file */33const struct inode_operations coda_ioctl_inode_operations = {34 .permission = coda_ioctl_permission,35 .setattr = coda_setattr,36};37 38const struct file_operations coda_ioctl_operations = {39 .unlocked_ioctl = coda_pioctl,40 .llseek = noop_llseek,41};42 43/* the coda pioctl inode ops */44static int coda_ioctl_permission(struct mnt_idmap *idmap,45 struct inode *inode, int mask)46{47 return (mask & MAY_EXEC) ? -EACCES : 0;48}49 50static long coda_pioctl(struct file *filp, unsigned int cmd,51 unsigned long user_data)52{53 struct path path;54 int error;55 struct PioctlData data;56 struct inode *inode = file_inode(filp);57 struct inode *target_inode = NULL;58 struct coda_inode_info *cnp;59 60 /* get the Pioctl data arguments from user space */61 if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))62 return -EINVAL;63 64 /*65 * Look up the pathname. Note that the pathname is in66 * user memory, and namei takes care of this67 */68 error = user_path_at(AT_FDCWD, data.path,69 data.follow ? LOOKUP_FOLLOW : 0, &path);70 if (error)71 return error;72 73 target_inode = d_inode(path.dentry);74 75 /* return if it is not a Coda inode */76 if (target_inode->i_sb != inode->i_sb) {77 error = -EINVAL;78 goto out;79 }80 81 /* now proceed to make the upcall */82 cnp = ITOC(target_inode);83 84 error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);85out:86 path_put(&path);87 return error;88}89