[net-next-2.6.git] / drivers / usb / core / inode.c

/*****************************************************************************/

/*
 *	inode.c  --  Inode/Dentry functions for the USB device file system.
 *
 *	Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
 *	Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com)
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  History:
 *   0.1  04.01.2000  Created
 *   0.2  10.12.2001  converted to use the vfs layer better
 */

/*****************************************************************************/

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/usb.h>
#include <linux/namei.h>
#include <linux/usbdevice_fs.h>
#include <linux/parser.h>
#include <linux/notifier.h>
#include <linux/seq_file.h>
#include <asm/byteorder.h>
#include "usb.h"
#include "hcd.h"

#define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO)
#define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO)
#define USBFS_DEFAULT_LISTMODE S_IRUGO

static struct super_operations usbfs_ops;
static const struct file_operations default_file_operations;
static struct vfsmount *usbfs_mount;
static int usbfs_mount_count;	/* = 0 */
static int ignore_mount = 0;

static struct dentry *devices_usbfs_dentry;
static int num_buses;	/* = 0 */

static uid_t devuid;	/* = 0 */
static uid_t busuid;	/* = 0 */
static uid_t listuid;	/* = 0 */
static gid_t devgid;	/* = 0 */
static gid_t busgid;	/* = 0 */
static gid_t listgid;	/* = 0 */
static umode_t devmode = USBFS_DEFAULT_DEVMODE;
static umode_t busmode = USBFS_DEFAULT_BUSMODE;
static umode_t listmode = USBFS_DEFAULT_LISTMODE;

static int usbfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
{
	if (devuid != 0)
		seq_printf(seq, ",devuid=%u", devuid);
	if (devgid != 0)
		seq_printf(seq, ",devgid=%u", devgid);
	if (devmode != USBFS_DEFAULT_DEVMODE)
		seq_printf(seq, ",devmode=%o", devmode);
	if (busuid != 0)
		seq_printf(seq, ",busuid=%u", busuid);
	if (busgid != 0)
		seq_printf(seq, ",busgid=%u", busgid);
	if (busmode != USBFS_DEFAULT_BUSMODE)
		seq_printf(seq, ",busmode=%o", busmode);
	if (listuid != 0)
		seq_printf(seq, ",listuid=%u", listuid);
	if (listgid != 0)
		seq_printf(seq, ",listgid=%u", listgid);
	if (listmode != USBFS_DEFAULT_LISTMODE)
		seq_printf(seq, ",listmode=%o", listmode);

	return 0;
}

enum {
	Opt_devuid, Opt_devgid, Opt_devmode,
	Opt_busuid, Opt_busgid, Opt_busmode,
	Opt_listuid, Opt_listgid, Opt_listmode,
	Opt_err,
};

static match_table_t tokens = {
	{Opt_devuid, "devuid=%u"},
	{Opt_devgid, "devgid=%u"},
	{Opt_devmode, "devmode=%o"},
	{Opt_busuid, "busuid=%u"},
	{Opt_busgid, "busgid=%u"},
	{Opt_busmode, "busmode=%o"},
	{Opt_listuid, "listuid=%u"},
	{Opt_listgid, "listgid=%u"},
	{Opt_listmode, "listmode=%o"},
	{Opt_err, NULL}
};

static int parse_options(struct super_block *s, char *data)
{
	char *p;
	int option;

	/* (re)set to defaults. */
	devuid = 0;
	busuid = 0;
	listuid = 0;
	devgid = 0;
	busgid = 0;
	listgid = 0;
	devmode = USBFS_DEFAULT_DEVMODE;
	busmode = USBFS_DEFAULT_BUSMODE;
	listmode = USBFS_DEFAULT_LISTMODE;

	while ((p = strsep(&data, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_devuid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			devuid = option;
			break;
		case Opt_devgid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			devgid = option;
			break;
		case Opt_devmode:
			if (match_octal(&args[0], &option))
				return -EINVAL;
			devmode = option & S_IRWXUGO;
			break;
		case Opt_busuid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			busuid = option;
			break;
		case Opt_busgid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			busgid = option;
			break;
		case Opt_busmode:
			if (match_octal(&args[0], &option))
				return -EINVAL;
			busmode = option & S_IRWXUGO;
			break;
		case Opt_listuid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			listuid = option;
			break;
		case Opt_listgid:
			if (match_int(&args[0], &option))
			       return -EINVAL;
			listgid = option;
			break;
		case Opt_listmode:
			if (match_octal(&args[0], &option))
				return -EINVAL;
			listmode = option & S_IRWXUGO;
			break;
		default:
			err("usbfs: unrecognised mount option \"%s\" "
			    "or missing value\n", p);
			return -EINVAL;
		}
	}

	return 0;
}

static void update_special(struct dentry *special)
{
	special->d_inode->i_uid = listuid;
	special->d_inode->i_gid = listgid;
	special->d_inode->i_mode = S_IFREG | listmode;
}

static void update_dev(struct dentry *dev)
{
	dev->d_inode->i_uid = devuid;
	dev->d_inode->i_gid = devgid;
	dev->d_inode->i_mode = S_IFREG | devmode;
}

static void update_bus(struct dentry *bus)
{
	struct dentry *dev = NULL;

	bus->d_inode->i_uid = busuid;
	bus->d_inode->i_gid = busgid;
	bus->d_inode->i_mode = S_IFDIR | busmode;

	mutex_lock(&bus->d_inode->i_mutex);

	list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
		if (dev->d_inode)
			update_dev(dev);

	mutex_unlock(&bus->d_inode->i_mutex);
}

static void update_sb(struct super_block *sb)
{
	struct dentry *root = sb->s_root;
	struct dentry *bus = NULL;

	if (!root)
		return;

	mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);

	list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
		if (bus->d_inode) {
			switch (S_IFMT & bus->d_inode->i_mode) {
			case S_IFDIR:
				update_bus(bus);
				break;
			case S_IFREG:
				update_special(bus);
				break;
			default:
				warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode);
				break;
			}
		}
	}

	mutex_unlock(&root->d_inode->i_mutex);
}

static int remount(struct super_block *sb, int *flags, char *data)
{
	/* If this is not a real mount,
	 * i.e. it's a simple_pin_fs from create_special_files,
	 * then ignore it.
	 */
	if (ignore_mount)
		return 0;

	if (parse_options(sb, data)) {
		warn("usbfs: mount parameter error:");
		return -EINVAL;
	}

	if (usbfs_mount && usbfs_mount->mnt_sb)
		update_sb(usbfs_mount->mnt_sb);

	return 0;
}

static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev)
{
	struct inode *inode = new_inode(sb);

	if (inode) {
		inode->i_mode = mode;
		inode->i_uid = current->fsuid;
		inode->i_gid = current->fsgid;
		inode->i_blocks = 0;
		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		switch (mode & S_IFMT) {
		default:
			init_special_inode(inode, mode, dev);
			break;
		case S_IFREG:
			inode->i_fop = &default_file_operations;
			break;
		case S_IFDIR:
			inode->i_op = &simple_dir_inode_operations;
			inode->i_fop = &simple_dir_operations;

			/* directory inodes start off with i_nlink == 2 (for "." entry) */
			inc_nlink(inode);
			break;
		}
	}
	return inode; 
}

/* SMP-safe */
static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
			dev_t dev)
{
	struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
	int error = -EPERM;

	if (dentry->d_inode)
		return -EEXIST;

	if (inode) {
		d_instantiate(dentry, inode);
		dget(dentry);
		error = 0;
	}
	return error;
}

static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
{
	int res;

	mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
	res = usbfs_mknod (dir, dentry, mode, 0);
	if (!res)
		inc_nlink(dir);
	return res;
}

static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode)
{
	mode = (mode & S_IALLUGO) | S_IFREG;
	return usbfs_mknod (dir, dentry, mode, 0);
}

static inline int usbfs_positive (struct dentry *dentry)
{
	return dentry->d_inode && !d_unhashed(dentry);
}

static int usbfs_empty (struct dentry *dentry)
{
	struct list_head *list;

	spin_lock(&dcache_lock);

	list_for_each(list, &dentry->d_subdirs) {
		struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
		if (usbfs_positive(de)) {
			spin_unlock(&dcache_lock);
			return 0;
		}
	}

	spin_unlock(&dcache_lock);
	return 1;
}

static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	mutex_lock(&inode->i_mutex);
	drop_nlink(dentry->d_inode);
	dput(dentry);
	mutex_unlock(&inode->i_mutex);
	d_delete(dentry);
	return 0;
}

static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	int error = -ENOTEMPTY;
	struct inode * inode = dentry->d_inode;

	mutex_lock(&inode->i_mutex);
	dentry_unhash(dentry);
	if (usbfs_empty(dentry)) {
		drop_nlink(dentry->d_inode);
		drop_nlink(dentry->d_inode);
		dput(dentry);
		inode->i_flags |= S_DEAD;
		drop_nlink(dir);
		error = 0;
	}
	mutex_unlock(&inode->i_mutex);
	if (!error)
		d_delete(dentry);
	dput(dentry);
	return error;
}


/* default file operations */
static ssize_t default_read_file (struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	return 0;
}

static ssize_t default_write_file (struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos)
{
	return count;
}

static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
{
	loff_t retval = -EINVAL;

	mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
	switch(orig) {
	case 0:
		if (offset > 0) {
			file->f_pos = offset;
			retval = file->f_pos;
		} 
		break;
	case 1:
		if ((offset + file->f_pos) > 0) {
			file->f_pos += offset;
			retval = file->f_pos;
		} 
		break;
	default:
		break;
	}
	mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
	return retval;
}

static int default_open (struct inode *inode, struct file *file)
{
	if (inode->i_private)
		file->private_data = inode->i_private;

	return 0;
}

static const struct file_operations default_file_operations = {
	.read =		default_read_file,
	.write =	default_write_file,
	.open =		default_open,
	.llseek =	default_file_lseek,
};

static struct super_operations usbfs_ops = {
	.statfs =	simple_statfs,
	.drop_inode =	generic_delete_inode,
	.remount_fs =	remount,
	.show_options = usbfs_show_options,
};

static int usbfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *inode;
	struct dentry *root;

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = USBDEVICE_SUPER_MAGIC;
	sb->s_op = &usbfs_ops;
	sb->s_time_gran = 1;
	inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0);

	if (!inode) {
		dbg("%s: could not get inode!",__func__);
		return -ENOMEM;
	}

	root = d_alloc_root(inode);
	if (!root) {
		dbg("%s: could not get root dentry!",__func__);
		iput(inode);
		return -ENOMEM;
	}
	sb->s_root = root;
	return 0;
}

/*
 * fs_create_by_name - create a file, given a name
 * @name:	name of file
 * @mode:	type of file
 * @parent:	dentry of directory to create it in
 * @dentry:	resulting dentry of file
 *
 * This function handles both regular files and directories.
 */
static int fs_create_by_name (const char *name, mode_t mode,
			      struct dentry *parent, struct dentry **dentry)
{
	int error = 0;

	/* If the parent is not specified, we create it in the root.
	 * We need the root dentry to do this, which is in the super 
	 * block. A pointer to that is in the struct vfsmount that we
	 * have around.
	 */
	if (!parent ) {
		if (usbfs_mount && usbfs_mount->mnt_sb) {
			parent = usbfs_mount->mnt_sb->s_root;
		}
	}

	if (!parent) {
		dbg("Ah! can not find a parent!");
		return -EFAULT;
	}

	*dentry = NULL;
	mutex_lock(&parent->d_inode->i_mutex);
	*dentry = lookup_one_len(name, parent, strlen(name));
	if (!IS_ERR(dentry)) {
		if ((mode & S_IFMT) == S_IFDIR)
			error = usbfs_mkdir (parent->d_inode, *dentry, mode);
		else 
			error = usbfs_create (parent->d_inode, *dentry, mode);
	} else
		error = PTR_ERR(dentry);
	mutex_unlock(&parent->d_inode->i_mutex);

	return error;
}

static struct dentry *fs_create_file (const char *name, mode_t mode,
				      struct dentry *parent, void *data,
				      const struct file_operations *fops,
				      uid_t uid, gid_t gid)
{
	struct dentry *dentry;
	int error;

	dbg("creating file '%s'",name);

	error = fs_create_by_name (name, mode, parent, &dentry);
	if (error) {
		dentry = NULL;
	} else {
		if (dentry->d_inode) {
			if (data)
				dentry->d_inode->i_private = data;
			if (fops)
				dentry->d_inode->i_fop = fops;
			dentry->d_inode->i_uid = uid;
			dentry->d_inode->i_gid = gid;
		}
	}

	return dentry;
}

static void fs_remove_file (struct dentry *dentry)
{
	struct dentry *parent = dentry->d_parent;
	
	if (!parent || !parent->d_inode)
		return;

	mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT);
	if (usbfs_positive(dentry)) {
		if (dentry->d_inode) {
			if (S_ISDIR(dentry->d_inode->i_mode))
				usbfs_rmdir(parent->d_inode, dentry);
			else
				usbfs_unlink(parent->d_inode, dentry);
		dput(dentry);
		}
	}
	mutex_unlock(&parent->d_inode->i_mutex);
}

/* --------------------------------------------------------------------- */

static int usb_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt);
}

static struct file_system_type usb_fs_type = {
	.owner =	THIS_MODULE,
	.name =		"usbfs",
	.get_sb =	usb_get_sb,
	.kill_sb =	kill_litter_super,
};

/* --------------------------------------------------------------------- */

static int create_special_files (void)
{
	struct dentry *parent;
	int retval;

	/* the simple_pin_fs calls will call remount with no options
	 * without this flag that would overwrite the real mount options (if any)
	 */
	ignore_mount = 1;

	/* create the devices special file */
	retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
	if (retval) {
		err ("Unable to get usbfs mount");
		goto exit;
	}

	ignore_mount = 0;

	parent = usbfs_mount->mnt_sb->s_root;
	devices_usbfs_dentry = fs_create_file ("devices",
					       listmode | S_IFREG, parent,
					       NULL, &usbfs_devices_fops,
					       listuid, listgid);
	if (devices_usbfs_dentry == NULL) {
		err ("Unable to create devices usbfs file");
		retval = -ENODEV;
		goto error_clean_mounts;
	}

	goto exit;
	
error_clean_mounts:
	simple_release_fs(&usbfs_mount, &usbfs_mount_count);
exit:
	return retval;
}

static void remove_special_files (void)
{
	if (devices_usbfs_dentry)
		fs_remove_file (devices_usbfs_dentry);
	devices_usbfs_dentry = NULL;
	simple_release_fs(&usbfs_mount, &usbfs_mount_count);
}

void usbfs_update_special (void)
{
	struct inode *inode;

	if (devices_usbfs_dentry) {
		inode = devices_usbfs_dentry->d_inode;
		if (inode)
			inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	}
}

static void usbfs_add_bus(struct usb_bus *bus)
{
	struct dentry *parent;
	char name[8];
	int retval;

	/* create the special files if this is the first bus added */
	if (num_buses == 0) {
		retval = create_special_files();
		if (retval)
			return;
	}
	++num_buses;

	sprintf (name, "%03d", bus->busnum);

	parent = usbfs_mount->mnt_sb->s_root;
	bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
					    bus, NULL, busuid, busgid);
	if (bus->usbfs_dentry == NULL) {
		err ("error creating usbfs bus entry");
		return;
	}
}

static void usbfs_remove_bus(struct usb_bus *bus)
{
	if (bus->usbfs_dentry) {
		fs_remove_file (bus->usbfs_dentry);
		bus->usbfs_dentry = NULL;
	}

	--num_buses;
	if (num_buses <= 0) {
		remove_special_files();
		num_buses = 0;
	}
}

static void usbfs_add_device(struct usb_device *dev)
{
	char name[8];
	int i;
	int i_size;

	sprintf (name, "%03d", dev->devnum);
	dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG,
					    dev->bus->usbfs_dentry, dev,
					    &usbdev_file_operations,
					    devuid, devgid);
	if (dev->usbfs_dentry == NULL) {
		err ("error creating usbfs device entry");
		return;
	}

	/* Set the size of the device's file to be
	 * equal to the size of the device descriptors. */
	i_size = sizeof (struct usb_device_descriptor);
	for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
		struct usb_config_descriptor *config =
			(struct usb_config_descriptor *)dev->rawdescriptors[i];
		i_size += le16_to_cpu(config->wTotalLength);
	}
	if (dev->usbfs_dentry->d_inode)
		dev->usbfs_dentry->d_inode->i_size = i_size;
}

static void usbfs_remove_device(struct usb_device *dev)
{
	if (dev->usbfs_dentry) {
		fs_remove_file (dev->usbfs_dentry);
		dev->usbfs_dentry = NULL;
	}
	usb_fs_classdev_common_remove(dev);
}

static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)
{
	switch (action) {
	case USB_DEVICE_ADD:
		usbfs_add_device(dev);
		break;
	case USB_DEVICE_REMOVE:
		usbfs_remove_device(dev);
		break;
	case USB_BUS_ADD:
		usbfs_add_bus(dev);
		break;
	case USB_BUS_REMOVE:
		usbfs_remove_bus(dev);
	}

	usbfs_update_special();
	usbfs_conn_disc_event();
	return NOTIFY_OK;
}

static struct notifier_block usbfs_nb = {
	.notifier_call = 	usbfs_notify,
};

/* --------------------------------------------------------------------- */

static struct proc_dir_entry *usbdir = NULL;

int __init usbfs_init(void)
{
	int retval;

	retval = register_filesystem(&usb_fs_type);
	if (retval)
		return retval;

	usb_register_notify(&usbfs_nb);

	/* create mount point for usbfs */
	usbdir = proc_mkdir("bus/usb", NULL);

	return 0;
}

void usbfs_cleanup(void)
{
	usb_unregister_notify(&usbfs_nb);
	unregister_filesystem(&usb_fs_type);
	if (usbdir)
		remove_proc_entry("bus/usb", NULL);
}
Commit	Line	Data
1da177e4 LT	1	/*****************************************************************************/
	2
	3	/*
	4	* inode.c -- Inode/Dentry functions for the USB device file system.
	5	*
	6	* Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
	7	* Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com)
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
	23	* History:
	24	* 0.1 04.01.2000 Created
	25	* 0.2 10.12.2001 converted to use the vfs layer better
	26	*/
	27
	28	/*****************************************************************************/
	29
1da177e4 LT	30	#include <linux/module.h>
	31	#include <linux/fs.h>
	32	#include <linux/mount.h>
	33	#include <linux/pagemap.h>
	34	#include <linux/init.h>
	35	#include <linux/proc_fs.h>
	36	#include <linux/usb.h>
	37	#include <linux/namei.h>
	38	#include <linux/usbdevice_fs.h>
1da177e4	39	#include <linux/parser.h>
54a5c4cd	40	#include <linux/notifier.h>
2e4f3c02	41	#include <linux/seq_file.h>
1da177e4 LT	42	#include <asm/byteorder.h>
1da177e4 LT	43	#include "usb.h"
6d5e8254	44	#include "hcd.h"
1da177e4	45
2e4f3c02 MS	46	#define USBFS_DEFAULT_DEVMODE (S_IWUSR \| S_IRUGO)
	47	#define USBFS_DEFAULT_BUSMODE (S_IXUGO \| S_IRUGO)
	48	#define USBFS_DEFAULT_LISTMODE S_IRUGO
	49
1da177e4	50	static struct super_operations usbfs_ops;
066202dd	51	static const struct file_operations default_file_operations;
1da177e4 LT	52	static struct vfsmount *usbfs_mount;
	53	static int usbfs_mount_count; /* = 0 */
	54	static int ignore_mount = 0;
	55
	56	static struct dentry *devices_usbfs_dentry;
	57	static int num_buses; /* = 0 */
	58
	59	static uid_t devuid; /* = 0 */
	60	static uid_t busuid; /* = 0 */
	61	static uid_t listuid; /* = 0 */
	62	static gid_t devgid; /* = 0 */
	63	static gid_t busgid; /* = 0 */
	64	static gid_t listgid; /* = 0 */
2e4f3c02 MS	65	static umode_t devmode = USBFS_DEFAULT_DEVMODE;
	66	static umode_t busmode = USBFS_DEFAULT_BUSMODE;
	67	static umode_t listmode = USBFS_DEFAULT_LISTMODE;
	68
	69	static int usbfs_show_options(struct seq_file seq, struct vfsmount mnt)
	70	{
	71	if (devuid != 0)
	72	seq_printf(seq, ",devuid=%u", devuid);
	73	if (devgid != 0)
	74	seq_printf(seq, ",devgid=%u", devgid);
	75	if (devmode != USBFS_DEFAULT_DEVMODE)
	76	seq_printf(seq, ",devmode=%o", devmode);
	77	if (busuid != 0)
	78	seq_printf(seq, ",busuid=%u", busuid);
	79	if (busgid != 0)
	80	seq_printf(seq, ",busgid=%u", busgid);
	81	if (busmode != USBFS_DEFAULT_BUSMODE)
	82	seq_printf(seq, ",busmode=%o", busmode);
	83	if (listuid != 0)
	84	seq_printf(seq, ",listuid=%u", listuid);
	85	if (listgid != 0)
	86	seq_printf(seq, ",listgid=%u", listgid);
	87	if (listmode != USBFS_DEFAULT_LISTMODE)
	88	seq_printf(seq, ",listmode=%o", listmode);
	89
	90	return 0;
	91	}
1da177e4 LT	92
	93	enum {
	94	Opt_devuid, Opt_devgid, Opt_devmode,
	95	Opt_busuid, Opt_busgid, Opt_busmode,
	96	Opt_listuid, Opt_listgid, Opt_listmode,
	97	Opt_err,
	98	};
	99
	100	static match_table_t tokens = {
	101	{Opt_devuid, "devuid=%u"},
	102	{Opt_devgid, "devgid=%u"},
	103	{Opt_devmode, "devmode=%o"},
	104	{Opt_busuid, "busuid=%u"},
	105	{Opt_busgid, "busgid=%u"},
	106	{Opt_busmode, "busmode=%o"},
	107	{Opt_listuid, "listuid=%u"},
	108	{Opt_listgid, "listgid=%u"},
	109	{Opt_listmode, "listmode=%o"},
	110	{Opt_err, NULL}
	111	};
	112
	113	static int parse_options(struct super_block s, char data)
	114	{
	115	char *p;
	116	int option;
	117
	118	/* (re)set to defaults. */
	119	devuid = 0;
	120	busuid = 0;
	121	listuid = 0;
	122	devgid = 0;
	123	busgid = 0;
	124	listgid = 0;
2e4f3c02 MS	125	devmode = USBFS_DEFAULT_DEVMODE;
	126	busmode = USBFS_DEFAULT_BUSMODE;
	127	listmode = USBFS_DEFAULT_LISTMODE;
1da177e4 LT	128
	129	while ((p = strsep(&data, ",")) != NULL) {
	130	substring_t args[MAX_OPT_ARGS];
	131	int token;
	132	if (!*p)
	133	continue;
	134
	135	token = match_token(p, tokens, args);
	136	switch (token) {
	137	case Opt_devuid:
	138	if (match_int(&args[0], &option))
	139	return -EINVAL;
	140	devuid = option;
	141	break;
	142	case Opt_devgid:
	143	if (match_int(&args[0], &option))
	144	return -EINVAL;
	145	devgid = option;
	146	break;
	147	case Opt_devmode:
	148	if (match_octal(&args[0], &option))
	149	return -EINVAL;
	150	devmode = option & S_IRWXUGO;
	151	break;
	152	case Opt_busuid:
	153	if (match_int(&args[0], &option))
	154	return -EINVAL;
	155	busuid = option;
	156	break;
	157	case Opt_busgid:
	158	if (match_int(&args[0], &option))
	159	return -EINVAL;
	160	busgid = option;
	161	break;
	162	case Opt_busmode:
	163	if (match_octal(&args[0], &option))
	164	return -EINVAL;
	165	busmode = option & S_IRWXUGO;
	166	break;
	167	case Opt_listuid:
	168	if (match_int(&args[0], &option))
	169	return -EINVAL;
	170	listuid = option;
	171	break;
	172	case Opt_listgid:
	173	if (match_int(&args[0], &option))
	174	return -EINVAL;
	175	listgid = option;
	176	break;
	177	case Opt_listmode:
	178	if (match_octal(&args[0], &option))
	179	return -EINVAL;
	180	listmode = option & S_IRWXUGO;
	181	break;
	182	default:
	183	err("usbfs: unrecognised mount option \"%s\" "
	184	"or missing value\n", p);
	185	return -EINVAL;
	186	}
	187	}
	188
	189	return 0;
	190	}
	191
192	static void update_special(struct dentry *special)
193	{
194	special->d_inode->i_uid = listuid;
195	special->d_inode->i_gid = listgid;
196	special->d_inode->i_mode = S_IFREG \| listmode;
197	}
198
199	static void update_dev(struct dentry *dev)
200	{
201	dev->d_inode->i_uid = devuid;
202	dev->d_inode->i_gid = devgid;
203	dev->d_inode->i_mode = S_IFREG \| devmode;
204	}
205
206	static void update_bus(struct dentry *bus)
207	{
208	struct dentry *dev = NULL;
209
210	bus->d_inode->i_uid = busuid;
211	bus->d_inode->i_gid = busgid;
212	bus->d_inode->i_mode = S_IFDIR \| busmode;
213
1b1dcc1b	214	mutex_lock(&bus->d_inode->i_mutex);
1da177e4	215
5160ee6f	216	list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
1da177e4 LT	217	if (dev->d_inode)
	218	update_dev(dev);
	219
1b1dcc1b	220	mutex_unlock(&bus->d_inode->i_mutex);
1da177e4 LT	221	}
	222
	223	static void update_sb(struct super_block *sb)
	224	{
	225	struct dentry *root = sb->s_root;
	226	struct dentry *bus = NULL;
	227
	228	if (!root)
	229	return;
	230
f2eace23	231	mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
1da177e4	232
5160ee6f	233	list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
1da177e4 LT	234	if (bus->d_inode) {
	235	switch (S_IFMT & bus->d_inode->i_mode) {
	236	case S_IFDIR:
	237	update_bus(bus);
	238	break;
	239	case S_IFREG:
	240	update_special(bus);
	241	break;
	242	default:
	243	warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode);
	244	break;
	245	}
	246	}
	247	}
	248
1b1dcc1b	249	mutex_unlock(&root->d_inode->i_mutex);
1da177e4 LT	250	}
	251
	252	static int remount(struct super_block sb, int flags, char *data)
	253	{
	254	/* If this is not a real mount,
	255	* i.e. it's a simple_pin_fs from create_special_files,
	256	* then ignore it.
	257	*/
	258	if (ignore_mount)
	259	return 0;
	260
	261	if (parse_options(sb, data)) {
	262	warn("usbfs: mount parameter error:");
	263	return -EINVAL;
	264	}
	265
	266	if (usbfs_mount && usbfs_mount->mnt_sb)
	267	update_sb(usbfs_mount->mnt_sb);
	268
	269	return 0;
	270	}
	271
	272	static struct inode usbfs_get_inode (struct super_block sb, int mode, dev_t dev)
	273	{
	274	struct inode *inode = new_inode(sb);
	275
	276	if (inode) {
	277	inode->i_mode = mode;
	278	inode->i_uid = current->fsuid;
	279	inode->i_gid = current->fsgid;
1da177e4 LT	280	inode->i_blocks = 0;
	281	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	282	switch (mode & S_IFMT) {
	283	default:
	284	init_special_inode(inode, mode, dev);
	285	break;
	286	case S_IFREG:
	287	inode->i_fop = &default_file_operations;
	288	break;
	289	case S_IFDIR:
bc7cb323	290	inode->i_op = &simple_dir_inode_operations;
1da177e4 LT	291	inode->i_fop = &simple_dir_operations;
	292
	293	/* directory inodes start off with i_nlink == 2 (for "." entry) */
d8c76e6f	294	inc_nlink(inode);
1da177e4 LT	295	break;
	296	}
	297	}
	298	return inode;
	299	}
	300
	301	/* SMP-safe */
	302	static int usbfs_mknod (struct inode dir, struct dentry dentry, int mode,
	303	dev_t dev)
	304	{
	305	struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
	306	int error = -EPERM;
	307
	308	if (dentry->d_inode)
	309	return -EEXIST;
	310
	311	if (inode) {
	312	d_instantiate(dentry, inode);
	313	dget(dentry);
	314	error = 0;
	315	}
	316	return error;
	317	}
	318
	319	static int usbfs_mkdir (struct inode dir, struct dentry dentry, int mode)
	320	{
	321	int res;
	322
	323	mode = (mode & (S_IRWXUGO \| S_ISVTX)) \| S_IFDIR;
	324	res = usbfs_mknod (dir, dentry, mode, 0);
	325	if (!res)
d8c76e6f	326	inc_nlink(dir);
1da177e4 LT	327	return res;
	328	}
	329
	330	static int usbfs_create (struct inode dir, struct dentry dentry, int mode)
	331	{
	332	mode = (mode & S_IALLUGO) \| S_IFREG;
	333	return usbfs_mknod (dir, dentry, mode, 0);
	334	}
	335
	336	static inline int usbfs_positive (struct dentry *dentry)
	337	{
	338	return dentry->d_inode && !d_unhashed(dentry);
	339	}
	340
	341	static int usbfs_empty (struct dentry *dentry)
	342	{
	343	struct list_head *list;
	344
	345	spin_lock(&dcache_lock);
	346
	347	list_for_each(list, &dentry->d_subdirs) {
5160ee6f	348	struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
1da177e4 LT	349	if (usbfs_positive(de)) {
	350	spin_unlock(&dcache_lock);
	351	return 0;
	352	}
	353	}
	354
	355	spin_unlock(&dcache_lock);
	356	return 1;
	357	}
	358
	359	static int usbfs_unlink (struct inode dir, struct dentry dentry)
	360	{
	361	struct inode *inode = dentry->d_inode;
1b1dcc1b	362	mutex_lock(&inode->i_mutex);
9a53c3a7	363	drop_nlink(dentry->d_inode);
1da177e4	364	dput(dentry);
1b1dcc1b	365	mutex_unlock(&inode->i_mutex);
1da177e4 LT	366	d_delete(dentry);
	367	return 0;
	368	}
	369
	370	static int usbfs_rmdir(struct inode dir, struct dentry dentry)
	371	{
	372	int error = -ENOTEMPTY;
	373	struct inode * inode = dentry->d_inode;
	374
1b1dcc1b	375	mutex_lock(&inode->i_mutex);
1da177e4 LT	376	dentry_unhash(dentry);
1da177e4 LT	377	if (usbfs_empty(dentry)) {
9a53c3a7 DH	378	drop_nlink(dentry->d_inode);
9a53c3a7 DH	379	drop_nlink(dentry->d_inode);
1da177e4 LT	380	dput(dentry);
1da177e4 LT	381	inode->i_flags \|= S_DEAD;
9a53c3a7	382	drop_nlink(dir);
1da177e4 LT	383	error = 0;
1da177e4 LT	384	}
1b1dcc1b	385	mutex_unlock(&inode->i_mutex);
1da177e4 LT	386	if (!error)
	387	d_delete(dentry);
	388	dput(dentry);
	389	return error;
	390	}
	391
	392
	393	/* default file operations */
	394	static ssize_t default_read_file (struct file file, char __user buf,
	395	size_t count, loff_t *ppos)
	396	{
	397	return 0;
	398	}
	399
	400	static ssize_t default_write_file (struct file file, const char __user buf,
	401	size_t count, loff_t *ppos)
	402	{
	403	return count;
	404	}
	405
	406	static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
	407	{
	408	loff_t retval = -EINVAL;
	409
33cb8994	410	mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
1da177e4 LT	411	switch(orig) {
	412	case 0:
	413	if (offset > 0) {
	414	file->f_pos = offset;
	415	retval = file->f_pos;
	416	}
	417	break;
	418	case 1:
	419	if ((offset + file->f_pos) > 0) {
	420	file->f_pos += offset;
	421	retval = file->f_pos;
	422	}
	423	break;
	424	default:
	425	break;
	426	}
33cb8994	427	mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
1da177e4 LT	428	return retval;
	429	}
	430
	431	static int default_open (struct inode inode, struct file file)
	432	{
8e18e294 TT	433	if (inode->i_private)
8e18e294 TT	434	file->private_data = inode->i_private;
1da177e4 LT	435
	436	return 0;
	437	}
	438
066202dd	439	static const struct file_operations default_file_operations = {
1da177e4 LT	440	.read = default_read_file,
	441	.write = default_write_file,
	442	.open = default_open,
	443	.llseek = default_file_lseek,
	444	};
	445
1da177e4 LT	446	static struct super_operations usbfs_ops = {
	447	.statfs = simple_statfs,
	448	.drop_inode = generic_delete_inode,
	449	.remount_fs = remount,
2e4f3c02	450	.show_options = usbfs_show_options,
1da177e4 LT	451	};
	452
	453	static int usbfs_fill_super(struct super_block sb, void data, int silent)
	454	{
	455	struct inode *inode;
	456	struct dentry *root;
	457
	458	sb->s_blocksize = PAGE_CACHE_SIZE;
	459	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	460	sb->s_magic = USBDEVICE_SUPER_MAGIC;
	461	sb->s_op = &usbfs_ops;
	462	sb->s_time_gran = 1;
	463	inode = usbfs_get_inode(sb, S_IFDIR \| 0755, 0);
	464
	465	if (!inode) {
441b62c1	466	dbg("%s: could not get inode!",__func__);
1da177e4 LT	467	return -ENOMEM;
	468	}
	469
	470	root = d_alloc_root(inode);
	471	if (!root) {
441b62c1	472	dbg("%s: could not get root dentry!",__func__);
1da177e4 LT	473	iput(inode);
	474	return -ENOMEM;
	475	}
	476	sb->s_root = root;
	477	return 0;
	478	}
	479
1da177e4 LT	480	/*
	481	* fs_create_by_name - create a file, given a name
	482	* @name: name of file
	483	* @mode: type of file
	484	* @parent: dentry of directory to create it in
	485	* @dentry: resulting dentry of file
	486	*
	487	* This function handles both regular files and directories.
	488	*/
	489	static int fs_create_by_name (const char *name, mode_t mode,
	490	struct dentry parent, struct dentry *dentry)
	491	{
	492	int error = 0;
	493
	494	/* If the parent is not specified, we create it in the root.
	495	* We need the root dentry to do this, which is in the super
	496	* block. A pointer to that is in the struct vfsmount that we
	497	* have around.
	498	*/
	499	if (!parent ) {
	500	if (usbfs_mount && usbfs_mount->mnt_sb) {
	501	parent = usbfs_mount->mnt_sb->s_root;
	502	}
	503	}
	504
	505	if (!parent) {
	506	dbg("Ah! can not find a parent!");
	507	return -EFAULT;
	508	}
	509
	510	*dentry = NULL;
1b1dcc1b	511	mutex_lock(&parent->d_inode->i_mutex);
5f45f1a7	512	*dentry = lookup_one_len(name, parent, strlen(name));
1da177e4 LT	513	if (!IS_ERR(dentry)) {
	514	if ((mode & S_IFMT) == S_IFDIR)
	515	error = usbfs_mkdir (parent->d_inode, *dentry, mode);
	516	else
	517	error = usbfs_create (parent->d_inode, *dentry, mode);
	518	} else
	519	error = PTR_ERR(dentry);
1b1dcc1b	520	mutex_unlock(&parent->d_inode->i_mutex);
1da177e4 LT	521
	522	return error;
	523	}
	524
	525	static struct dentry fs_create_file (const char name, mode_t mode,
	526	struct dentry parent, void data,
066202dd	527	const struct file_operations *fops,
1da177e4 LT	528	uid_t uid, gid_t gid)
	529	{
	530	struct dentry *dentry;
	531	int error;
	532
	533	dbg("creating file '%s'",name);
	534
	535	error = fs_create_by_name (name, mode, parent, &dentry);
	536	if (error) {
	537	dentry = NULL;
	538	} else {
	539	if (dentry->d_inode) {
	540	if (data)
8e18e294	541	dentry->d_inode->i_private = data;
1da177e4 LT	542	if (fops)
	543	dentry->d_inode->i_fop = fops;
	544	dentry->d_inode->i_uid = uid;
	545	dentry->d_inode->i_gid = gid;
	546	}
	547	}
	548
	549	return dentry;
	550	}
	551
	552	static void fs_remove_file (struct dentry *dentry)
	553	{
	554	struct dentry *parent = dentry->d_parent;
	555
	556	if (!parent \|\| !parent->d_inode)
	557	return;
	558
8e7795ef	559	mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT);
1da177e4 LT	560	if (usbfs_positive(dentry)) {
	561	if (dentry->d_inode) {
	562	if (S_ISDIR(dentry->d_inode->i_mode))
	563	usbfs_rmdir(parent->d_inode, dentry);
	564	else
	565	usbfs_unlink(parent->d_inode, dentry);
	566	dput(dentry);
	567	}
	568	}
1b1dcc1b	569	mutex_unlock(&parent->d_inode->i_mutex);
1da177e4 LT	570	}
	571
	572	/* --------------------------------------------------------------------- */
	573
454e2398 DH	574	static int usb_get_sb(struct file_system_type *fs_type,
454e2398 DH	575	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	576	{
454e2398	577	return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt);
1da177e4 LT	578	}
	579
	580	static struct file_system_type usb_fs_type = {
	581	.owner = THIS_MODULE,
	582	.name = "usbfs",
	583	.get_sb = usb_get_sb,
	584	.kill_sb = kill_litter_super,
	585	};
	586
	587	/* --------------------------------------------------------------------- */
	588
	589	static int create_special_files (void)
	590	{
	591	struct dentry *parent;
	592	int retval;
	593
	594	/* the simple_pin_fs calls will call remount with no options
	595	* without this flag that would overwrite the real mount options (if any)
	596	*/
	597	ignore_mount = 1;
	598
	599	/* create the devices special file */
1f5ce9e9	600	retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
1da177e4 LT	601	if (retval) {
	602	err ("Unable to get usbfs mount");
	603	goto exit;
	604	}
	605
	606	ignore_mount = 0;
	607
	608	parent = usbfs_mount->mnt_sb->s_root;
	609	devices_usbfs_dentry = fs_create_file ("devices",
	610	listmode \| S_IFREG, parent,
	611	NULL, &usbfs_devices_fops,
	612	listuid, listgid);
	613	if (devices_usbfs_dentry == NULL) {
	614	err ("Unable to create devices usbfs file");
	615	retval = -ENODEV;
	616	goto error_clean_mounts;
	617	}
	618
	619	goto exit;
	620
	621	error_clean_mounts:
	622	simple_release_fs(&usbfs_mount, &usbfs_mount_count);
	623	exit:
	624	return retval;
	625	}
	626
	627	static void remove_special_files (void)
	628	{
	629	if (devices_usbfs_dentry)
	630	fs_remove_file (devices_usbfs_dentry);
	631	devices_usbfs_dentry = NULL;
	632	simple_release_fs(&usbfs_mount, &usbfs_mount_count);
	633	}
	634
	635	void usbfs_update_special (void)
	636	{
	637	struct inode *inode;
	638
	639	if (devices_usbfs_dentry) {
	640	inode = devices_usbfs_dentry->d_inode;
	641	if (inode)
	642	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	643	}
	644	}
	645
54a5c4cd	646	static void usbfs_add_bus(struct usb_bus *bus)
1da177e4 LT	647	{
	648	struct dentry *parent;
	649	char name[8];
	650	int retval;
	651
	652	/* create the special files if this is the first bus added */
	653	if (num_buses == 0) {
	654	retval = create_special_files();
	655	if (retval)
	656	return;
	657	}
	658	++num_buses;
	659
	660	sprintf (name, "%03d", bus->busnum);
	661
	662	parent = usbfs_mount->mnt_sb->s_root;
	663	bus->usbfs_dentry = fs_create_file (name, busmode \| S_IFDIR, parent,
	664	bus, NULL, busuid, busgid);
	665	if (bus->usbfs_dentry == NULL) {
	666	err ("error creating usbfs bus entry");
	667	return;
	668	}
1da177e4 LT	669	}
1da177e4 LT	670
54a5c4cd	671	static void usbfs_remove_bus(struct usb_bus *bus)
1da177e4 LT	672	{
	673	if (bus->usbfs_dentry) {
	674	fs_remove_file (bus->usbfs_dentry);
	675	bus->usbfs_dentry = NULL;
	676	}
	677
	678	--num_buses;
	679	if (num_buses <= 0) {
	680	remove_special_files();
	681	num_buses = 0;
	682	}
1da177e4 LT	683	}
1da177e4 LT	684
54a5c4cd	685	static void usbfs_add_device(struct usb_device *dev)
1da177e4 LT	686	{
	687	char name[8];
	688	int i;
	689	int i_size;
	690
	691	sprintf (name, "%03d", dev->devnum);
	692	dev->usbfs_dentry = fs_create_file (name, devmode \| S_IFREG,
	693	dev->bus->usbfs_dentry, dev,
9f8b17e6	694	&usbdev_file_operations,
1da177e4 LT	695	devuid, devgid);
	696	if (dev->usbfs_dentry == NULL) {
	697	err ("error creating usbfs device entry");
	698	return;
	699	}
	700
	701	/* Set the size of the device's file to be
	702	* equal to the size of the device descriptors. */
	703	i_size = sizeof (struct usb_device_descriptor);
	704	for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
	705	struct usb_config_descriptor *config =
	706	(struct usb_config_descriptor *)dev->rawdescriptors[i];
	707	i_size += le16_to_cpu(config->wTotalLength);
	708	}
	709	if (dev->usbfs_dentry->d_inode)
	710	dev->usbfs_dentry->d_inode->i_size = i_size;
1da177e4 LT	711	}
1da177e4 LT	712
54a5c4cd	713	static void usbfs_remove_device(struct usb_device *dev)
1da177e4	714	{
1da177e4 LT	715	if (dev->usbfs_dentry) {
	716	fs_remove_file (dev->usbfs_dentry);
	717	dev->usbfs_dentry = NULL;
	718	}
cd9f0375	719	usb_fs_classdev_common_remove(dev);
54a5c4cd GKH	720	}
	721
	722	static int usbfs_notify(struct notifier_block self, unsigned long action, void dev)
	723	{
	724	switch (action) {
	725	case USB_DEVICE_ADD:
	726	usbfs_add_device(dev);
	727	break;
	728	case USB_DEVICE_REMOVE:
	729	usbfs_remove_device(dev);
	730	break;
	731	case USB_BUS_ADD:
	732	usbfs_add_bus(dev);
	733	break;
	734	case USB_BUS_REMOVE:
	735	usbfs_remove_bus(dev);
	736	}
	737
1da177e4 LT	738	usbfs_update_special();
1da177e4 LT	739	usbfs_conn_disc_event();
54a5c4cd	740	return NOTIFY_OK;
1da177e4 LT	741	}
1da177e4 LT	742
54a5c4cd GKH	743	static struct notifier_block usbfs_nb = {
	744	.notifier_call = usbfs_notify,
	745	};
	746
1da177e4 LT	747	/* --------------------------------------------------------------------- */
	748
	749	static struct proc_dir_entry *usbdir = NULL;
	750
	751	int __init usbfs_init(void)
	752	{
	753	int retval;
	754
1da177e4	755	retval = register_filesystem(&usb_fs_type);
fbf82fd2	756	if (retval)
1da177e4	757	return retval;
1da177e4	758
54a5c4cd GKH	759	usb_register_notify(&usbfs_nb);
54a5c4cd GKH	760
1da177e4	761	/* create mount point for usbfs */
9c37066d	762	usbdir = proc_mkdir("bus/usb", NULL);
1da177e4 LT	763
	764	return 0;
	765	}
	766
	767	void usbfs_cleanup(void)
	768	{
54a5c4cd	769	usb_unregister_notify(&usbfs_nb);
1da177e4 LT	770	unregister_filesystem(&usb_fs_type);
1da177e4 LT	771	if (usbdir)
9c37066d	772	remove_proc_entry("bus/usb", NULL);
1da177e4 LT	773	}
1da177e4 LT	774