// SPDX-License-Identifier: GPL-2.0
/*
 * Pioctl operations for Coda.
 * Original version: (C) 1996 Peter Braam
 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
 *
 * Carnegie Mellon encourages users of this code to contribute improvements
 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/namei.h>
#include <linux/module.h>
#include <linux/uaccess.h>

#include <linux/coda.h>
#include "coda_psdev.h"
#include "coda_linux.h"

/* pioctl ops */
static int coda_ioctl_permission(struct mnt_idmap *idmap,
                                 struct inode *inode, int mask);
static long coda_pioctl(struct file *filp, unsigned int cmd,
                        unsigned long user_data);

/* exported from this file */
const struct inode_operations coda_ioctl_inode_operations = {
        .permission     = coda_ioctl_permission,
        .setattr        = coda_setattr,
};

const struct file_operations coda_ioctl_operations = {
        .unlocked_ioctl = coda_pioctl,
        .llseek         = noop_llseek,
};

/* the coda pioctl inode ops */
static int coda_ioctl_permission(struct mnt_idmap *idmap,
                                 struct inode *inode, int mask)
{
        return (mask & MAY_EXEC) ? -EACCES : 0;
}

static long coda_pioctl(struct file *filp, unsigned int cmd,
                        unsigned long user_data)
{
        struct path path;
        int error;
        struct PioctlData data;
        struct inode *inode = file_inode(filp);
        struct inode *target_inode = NULL;
        struct coda_inode_info *cnp;

        /* get the Pioctl data arguments from user space */
        if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
                return -EINVAL;

        /*
         * Look up the pathname. Note that the pathname is in
         * user memory, and namei takes care of this
         */
        error = user_path_at(AT_FDCWD, data.path,
                             data.follow ? LOOKUP_FOLLOW : 0, &path);
        if (error)
                return error;

        target_inode = d_inode(path.dentry);

        /* return if it is not a Coda inode */
        if (target_inode->i_sb != inode->i_sb) {
                error = -EINVAL;
                goto out;
        }

        /* now proceed to make the upcall */
        cnp = ITOC(target_inode);

        error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
out:
        path_put(&path);
        return error;
}