Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
new file mode 100644
index 0000000..d913407
--- /dev/null
+++ b/drivers/usb/core/inode.c
@@ -0,0 +1,764 @@
+/*****************************************************************************/
+
+/*
+ * 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/config.h>
+#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/smp_lock.h>
+#include <linux/parser.h>
+#include <asm/byteorder.h>
+#include "usb.h"
+
+static struct super_operations usbfs_ops;
+static struct file_operations default_file_operations;
+static struct inode_operations usbfs_dir_inode_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 = S_IWUSR | S_IRUGO;
+static umode_t busmode = S_IXUGO | S_IRUGO;
+static umode_t listmode = S_IRUGO;
+
+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 = S_IWUSR | S_IRUGO;
+ busmode = S_IXUGO | S_IRUGO;
+ listmode = S_IRUGO;
+
+ 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;
+
+ down(&bus->d_inode->i_sem);
+
+ list_for_each_entry(dev, &bus->d_subdirs, d_child)
+ if (dev->d_inode)
+ update_dev(dev);
+
+ up(&bus->d_inode->i_sem);
+}
+
+static void update_sb(struct super_block *sb)
+{
+ struct dentry *root = sb->s_root;
+ struct dentry *bus = NULL;
+
+ if (!root)
+ return;
+
+ down(&root->d_inode->i_sem);
+
+ list_for_each_entry(bus, &root->d_subdirs, 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;
+ }
+ }
+ }
+
+ up(&root->d_inode->i_sem);
+}
+
+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_blksize = PAGE_CACHE_SIZE;
+ 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 = &usbfs_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+
+ /* directory inodes start off with i_nlink == 2 (for "." entry) */
+ inode->i_nlink++;
+ 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)
+ dir->i_nlink++;
+ 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_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;
+ down(&inode->i_sem);
+ dentry->d_inode->i_nlink--;
+ dput(dentry);
+ up(&inode->i_sem);
+ d_delete(dentry);
+ return 0;
+}
+
+static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ int error = -ENOTEMPTY;
+ struct inode * inode = dentry->d_inode;
+
+ down(&inode->i_sem);
+ dentry_unhash(dentry);
+ if (usbfs_empty(dentry)) {
+ dentry->d_inode->i_nlink -= 2;
+ dput(dentry);
+ inode->i_flags |= S_DEAD;
+ dir->i_nlink--;
+ error = 0;
+ }
+ up(&inode->i_sem);
+ 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;
+
+ down(&file->f_dentry->d_inode->i_sem);
+ 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;
+ }
+ up(&file->f_dentry->d_inode->i_sem);
+ return retval;
+}
+
+static int default_open (struct inode *inode, struct file *file)
+{
+ if (inode->u.generic_ip)
+ file->private_data = inode->u.generic_ip;
+
+ return 0;
+}
+
+static struct file_operations default_file_operations = {
+ .read = default_read_file,
+ .write = default_write_file,
+ .open = default_open,
+ .llseek = default_file_lseek,
+};
+
+static struct inode_operations usbfs_dir_inode_operations = {
+ .lookup = simple_lookup,
+};
+
+static struct super_operations usbfs_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+ .remount_fs = remount,
+};
+
+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!",__FUNCTION__);
+ return -ENOMEM;
+ }
+
+ root = d_alloc_root(inode);
+ if (!root) {
+ dbg("%s: could not get root dentry!",__FUNCTION__);
+ iput(inode);
+ return -ENOMEM;
+ }
+ sb->s_root = root;
+ return 0;
+}
+
+static struct dentry * get_dentry(struct dentry *parent, const char *name)
+{
+ struct qstr qstr;
+
+ qstr.name = name;
+ qstr.len = strlen(name);
+ qstr.hash = full_name_hash(name,qstr.len);
+ return lookup_hash(&qstr,parent);
+}
+
+
+/*
+ * 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;
+ down(&parent->d_inode->i_sem);
+ *dentry = get_dentry (parent, 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);
+ up(&parent->d_inode->i_sem);
+
+ return error;
+}
+
+static struct dentry *fs_create_file (const char *name, mode_t mode,
+ struct dentry *parent, void *data,
+ 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->u.generic_ip = 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;
+
+ down(&parent->d_inode->i_sem);
+ 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);
+ }
+ }
+ up(&parent->d_inode->i_sem);
+}
+
+/* --------------------------------------------------------------------- */
+
+static struct super_block *usb_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return get_sb_single(fs_type, flags, data, usbfs_fill_super);
+}
+
+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("usbfs", &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;
+ }
+}
+
+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;
+ }
+
+ usbfs_update_special();
+ usbfs_conn_disc_event();
+}
+
+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;
+ }
+
+ usbfs_update_special();
+ usbfs_conn_disc_event();
+}
+
+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,
+ &usbfs_device_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;
+
+ usbfs_update_special();
+ usbfs_conn_disc_event();
+}
+
+void usbfs_remove_device(struct usb_device *dev)
+{
+ struct dev_state *ds;
+ struct siginfo sinfo;
+
+ if (dev->usbfs_dentry) {
+ fs_remove_file (dev->usbfs_dentry);
+ dev->usbfs_dentry = NULL;
+ }
+ while (!list_empty(&dev->filelist)) {
+ ds = list_entry(dev->filelist.next, struct dev_state, list);
+ wake_up_all(&ds->wait);
+ list_del_init(&ds->list);
+ if (ds->discsignr) {
+ sinfo.si_signo = SIGPIPE;
+ sinfo.si_errno = EPIPE;
+ sinfo.si_code = SI_ASYNCIO;
+ sinfo.si_addr = ds->disccontext;
+ send_sig_info(ds->discsignr, &sinfo, ds->disctask);
+ }
+ }
+ usbfs_update_special();
+ usbfs_conn_disc_event();
+}
+
+/* --------------------------------------------------------------------- */
+
+static struct proc_dir_entry *usbdir = NULL;
+
+int __init usbfs_init(void)
+{
+ int retval;
+
+ retval = usb_register(&usbfs_driver);
+ if (retval)
+ return retval;
+
+ retval = register_filesystem(&usb_fs_type);
+ if (retval) {
+ usb_deregister(&usbfs_driver);
+ return retval;
+ }
+
+ /* create mount point for usbfs */
+ usbdir = proc_mkdir("usb", proc_bus);
+
+ return 0;
+}
+
+void usbfs_cleanup(void)
+{
+ usb_deregister(&usbfs_driver);
+ unregister_filesystem(&usb_fs_type);
+ if (usbdir)
+ remove_proc_entry("usb", proc_bus);
+}
+