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/*
* 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/sched.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <asm/segment.h>
#include <linux/string.h>
#define __NO_VERSION__
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_cache.h>
#include <linux/coda_psdev.h>
/* pioctl ops */
static int coda_ioctl_permission(struct inode *inode, int mask);
static int coda_pioctl(struct inode * inode, struct file * filp,
unsigned int cmd, unsigned long arg);
/* exported from this file */
struct inode_operations coda_ioctl_inode_operations =
{
permission: coda_ioctl_permission,
setattr: coda_notify_change,
};
struct file_operations coda_ioctl_operations = {
owner: THIS_MODULE,
ioctl: coda_pioctl,
};
/* the coda pioctl inode ops */
static int coda_ioctl_permission(struct inode *inode, int mask)
{
ENTRY;
return 0;
}
static int coda_pioctl(struct inode * inode, struct file * filp,
unsigned int cmd, unsigned long user_data)
{
struct nameidata nd;
int error;
struct PioctlData data;
struct inode *target_inode = NULL;
struct coda_inode_info *cnp;
ENTRY;
/* get the Pioctl data arguments from user space */
if (copy_from_user(&data, (int *)user_data, sizeof(data))) {
return -EINVAL;
}
/*
* Look up the pathname. Note that the pathname is in
* user memory, and namei takes care of this
*/
CDEBUG(D_PIOCTL, "namei, data.follow = %d\n",
data.follow);
if ( data.follow ) {
error = user_path_walk(data.path, &nd);
} else {
error = user_path_walk_link(data.path, &nd);
}
if ( error ) {
CDEBUG(D_PIOCTL, "error: lookup fails.\n");
return error;
} else {
target_inode = nd.dentry->d_inode;
}
CDEBUG(D_PIOCTL, "target ino: 0x%ld, dev: 0x%d\n",
target_inode->i_ino, target_inode->i_dev);
/* return if it is not a Coda inode */
if ( target_inode->i_sb != inode->i_sb ) {
path_release(&nd);
return -EINVAL;
}
/* now proceed to make the upcall */
cnp = ITOC(target_inode);
error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
CDEBUG(D_PIOCTL, "ioctl on inode %ld\n", target_inode->i_ino);
CDEBUG(D_DOWNCALL, "dput on ino: %ld, icount %d, dcount %d\n", target_inode->i_ino,
atomic_read(&target_inode->i_count), atomic_read(&nd.dentry->d_count));
path_release(&nd);
return error;
}
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