dirty fix to merging

1 files changed, 748 insertions, 0 deletions

diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
new file mode 100644
index 00000000..d2b9af59
--- /dev/null
+++ b/drivers/usb/core/inode.c
@@ -0,0 +1,748 @@
+/*****************************************************************************/
+
+/*
+ *	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 <linux/usb/hcd.h>
+#include <asm/byteorder.h>
+#include "usb.h"
+
+#define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO)
+#define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO)
+#define USBFS_DEFAULT_LISTMODE S_IRUGO
+
+static const struct file_operations default_file_operations;
+static struct vfsmount *usbfs_mount;
+static int usbfs_mount_count;	/* = 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 dentry *root)
+{
+	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 const 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:
+			printk(KERN_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:
+				printk(KERN_WARNING "usbfs: 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 (*flags & MS_KERNMOUNT)
+		return 0;
+
+	if (parse_options(sb, data)) {
+		printk(KERN_WARNING "usbfs: mount parameter error.\n");
+		return -EINVAL;
+	}
+
+	if (usbfs_mount)
+		update_sb(usbfs_mount->mnt_sb);
+
+	return 0;
+}
+
+static struct inode *usbfs_get_inode (struct super_block *sb, umode_t mode, dev_t dev)
+{
+	struct inode *inode = new_inode(sb);
+
+	if (inode) {
+		inode->i_ino = get_next_ino();
+		inode_init_owner(inode, NULL, mode);
+		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, umode_t 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, umode_t 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, umode_t 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(&dentry->d_lock);
+	list_for_each(list, &dentry->d_subdirs) {
+		struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
+
+		spin_lock_nested(&de->d_lock, DENTRY_D_LOCK_NESTED);
+		if (usbfs_positive(de)) {
+			spin_unlock(&de->d_lock);
+			spin_unlock(&dentry->d_lock);
+			return 0;
+		}
+		spin_unlock(&de->d_lock);
+	}
+	spin_unlock(&dentry->d_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)) {
+		dont_mount(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);
+	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 const struct file_operations default_file_operations = {
+	.read =		default_read_file,
+	.write =	default_write_file,
+	.open =		simple_open,
+	.llseek =	default_file_lseek,
+};
+
+static const 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;
+
+	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);
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root) {
+		dbg("%s: could not get root dentry!",__func__);
+		return -ENOMEM;
+	}
+	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, umode_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)
+			parent = usbfs_mount->mnt_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 (S_ISDIR(mode))
+			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, umode_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 struct dentry *usb_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_single(fs_type, flags, data, usbfs_fill_super);
+}
+
+static struct file_system_type usb_fs_type = {
+	.owner =	THIS_MODULE,
+	.name =		"usbfs",
+	.mount =	usb_mount,
+	.kill_sb =	kill_litter_super,
+};
+
+/* --------------------------------------------------------------------- */
+
+static int create_special_files (void)
+{
+	struct dentry *parent;
+	int retval;
+
+	/* create the devices special file */
+	retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
+	if (retval) {
+		printk(KERN_ERR "Unable to get usbfs mount\n");
+		goto exit;
+	}
+
+	parent = usbfs_mount->mnt_root;
+	devices_usbfs_dentry = fs_create_file ("devices",
+					       listmode | S_IFREG, parent,
+					       NULL, &usbfs_devices_fops,
+					       listuid, listgid);
+	if (devices_usbfs_dentry == NULL) {
+		printk(KERN_ERR "Unable to create devices usbfs file\n");
+		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_root;
+	bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
+					    bus, NULL, busuid, busgid);
+	if (bus->usbfs_dentry == NULL) {
+		printk(KERN_ERR "Error creating usbfs bus entry\n");
+		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) {
+		printk(KERN_ERR "Error creating usbfs device entry\n");
+		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;
+	}
+}
+
+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);
+}
+