[linux-2.6-block.git] / fs / coda / pioctl.c

/*
 * 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 <linux/coda_psdev.h>

#include "coda_linux.h"

/* pioctl ops */
static int coda_ioctl_permission(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 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
	 */
	if (data.follow)
		error = user_path(data.path, &path);
	else
		error = user_lpath(data.path, &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;
}
Commit	Line	Data
	1	/*
	2	* Pioctl operations for Coda.
	3	* Original version: (C) 1996 Peter Braam
	4	* Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
	5	*
	6	* Carnegie Mellon encourages users of this code to contribute improvements
	7	* to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
	8	*/
	9
	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 <linux/uaccess.h>
	20
	21	#include <linux/coda.h>
	22	#include <linux/coda_psdev.h>
	23
	24	#include "coda_linux.h"
	25
	26	/* pioctl ops */
	27	static int coda_ioctl_permission(struct inode *inode, int mask);
	28	static long coda_pioctl(struct file *filp, unsigned int cmd,
	29	unsigned long user_data);
	30
	31	/* exported from this file */
	32	const struct inode_operations coda_ioctl_inode_operations = {
	33	.permission = coda_ioctl_permission,
	34	.setattr = coda_setattr,
	35	};
	36
	37	const struct file_operations coda_ioctl_operations = {
	38	.unlocked_ioctl = coda_pioctl,
	39	.llseek = noop_llseek,
	40	};
	41
	42	/* the coda pioctl inode ops */
	43	static int coda_ioctl_permission(struct inode *inode, int mask)
	44	{
	45	return (mask & MAY_EXEC) ? -EACCES : 0;
	46	}
	47
	48	static long coda_pioctl(struct file *filp, unsigned int cmd,
	49	unsigned long user_data)
	50	{
	51	struct path path;
	52	int error;
	53	struct PioctlData data;
	54	struct inode *inode = file_inode(filp);
	55	struct inode *target_inode = NULL;
	56	struct coda_inode_info *cnp;
	57
	58	/* get the Pioctl data arguments from user space */
	59	if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
	60	return -EINVAL;
	61
	62	/*
	63	* Look up the pathname. Note that the pathname is in
	64	* user memory, and namei takes care of this
	65	*/
	66	if (data.follow)
	67	error = user_path(data.path, &path);
	68	else
	69	error = user_lpath(data.path, &path);
	70
	71	if (error)
	72	return error;
	73
	74	target_inode = d_inode(path.dentry);
	75
	76	/* return if it is not a Coda inode */
	77	if (target_inode->i_sb != inode->i_sb) {
	78	error = -EINVAL;
	79	goto out;
	80	}
	81
	82	/* now proceed to make the upcall */
	83	cnp = ITOC(target_inode);
	84
	85	error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
	86	out:
	87	path_put(&path);
	88	return error;
	89	}