89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Pioctl operations for Coda.
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* Original version: (C) 1996 Peter Braam
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* Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
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*
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* Carnegie Mellon encourages users of this code to contribute improvements
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* to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/namei.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/coda.h>
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#include "coda_psdev.h"
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#include "coda_linux.h"
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/* pioctl ops */
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static int coda_ioctl_permission(struct user_namespace *mnt_userns,
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struct inode *inode, int mask);
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static long coda_pioctl(struct file *filp, unsigned int cmd,
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unsigned long user_data);
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/* exported from this file */
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const struct inode_operations coda_ioctl_inode_operations = {
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.permission = coda_ioctl_permission,
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.setattr = coda_setattr,
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};
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const struct file_operations coda_ioctl_operations = {
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.unlocked_ioctl = coda_pioctl,
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.llseek = noop_llseek,
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};
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/* the coda pioctl inode ops */
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static int coda_ioctl_permission(struct user_namespace *mnt_userns,
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struct inode *inode, int mask)
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{
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return (mask & MAY_EXEC) ? -EACCES : 0;
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}
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static long coda_pioctl(struct file *filp, unsigned int cmd,
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unsigned long user_data)
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{
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struct path path;
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int error;
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struct PioctlData data;
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struct inode *inode = file_inode(filp);
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struct inode *target_inode = NULL;
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struct coda_inode_info *cnp;
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/* get the Pioctl data arguments from user space */
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if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
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return -EINVAL;
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/*
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* Look up the pathname. Note that the pathname is in
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* user memory, and namei takes care of this
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*/
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error = user_path_at(AT_FDCWD, data.path,
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data.follow ? LOOKUP_FOLLOW : 0, &path);
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if (error)
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return error;
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target_inode = d_inode(path.dentry);
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/* return if it is not a Coda inode */
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if (target_inode->i_sb != inode->i_sb) {
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error = -EINVAL;
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goto out;
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}
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/* now proceed to make the upcall */
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cnp = ITOC(target_inode);
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error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
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out:
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path_put(&path);
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return error;
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}
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