diff options
Diffstat (limited to 'drivers/usb/core/inode.c')
| -rw-r--r-- | drivers/usb/core/inode.c | 776 |
1 files changed, 0 insertions, 776 deletions
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c deleted file mode 100644 index 9819a4cc3b2..00000000000 --- a/drivers/usb/core/inode.c +++ /dev/null @@ -1,776 +0,0 @@ -/*****************************************************************************/ - -/* - * 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/smp_lock.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 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 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 (ignore_mount) - return 0; - - if (parse_options(sb, data)) { - printk(KERN_WARNING "usbfs: mount parameter error.\n"); - 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_ino = get_next_ino(); - inode->i_mode = mode; - inode->i_uid = current_fsuid(); - inode->i_gid = current_fsgid(); - 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)) { - 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); - 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 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; - 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 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; - - /* 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) { - printk(KERN_ERR "Unable to get usbfs mount\n"); - 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) { - 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_sb->s_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); -} - |