Half of the usbfs code is the same as debugfs, so we can replace it now with calls to the generic libfs versions. Signed-off-by: Arnd Bergmann Index: linux-2.6/drivers/usb/core/inode.c =================================================================== --- linux-2.6.orig/drivers/usb/core/inode.c +++ linux-2.6/drivers/usb/core/inode.c @@ -47,11 +47,10 @@ #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 DEFINE_SIMPLE_FS(usb_fs_type, "usbfs", NULL, USBDEVICE_SUPER_MAGIC); +static struct dentry *usbfs_root; + +static int ignore_mount = 1; static struct dentry *devices_usbfs_dentry; static int num_buses; /* = 0 */ @@ -263,186 +262,11 @@ static int remount(struct super_block *s 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; + update_sb(usb_fs_type.mount->mnt_sb); 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, @@ -450,145 +274,32 @@ static struct super_operations usbfs_ops .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!",__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; -} - -/* - * 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; - } + /* If the parent is not specified, we create it in the root. */ + if (!parent) + parent = usbfs_root; + + dentry = simple_create_file(name, mode, parent, data, fops); + if (dentry && dentry->d_inode) { + 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 @@ -596,8 +307,7 @@ static int create_special_files (void) */ ignore_mount = 1; - /* create the devices special file */ - retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count); + retval = simple_pin_fs(&usb_fs_type.fstype, &usb_fs_type.mount, &usb_fs_type.mount_count); if (retval) { err ("Unable to get usbfs mount"); goto exit; @@ -605,9 +315,8 @@ static int create_special_files (void) ignore_mount = 0; - parent = usbfs_mount->mnt_sb->s_root; devices_usbfs_dentry = fs_create_file ("devices", - listmode | S_IFREG, parent, + listmode | S_IFREG, usbfs_root, NULL, &usbfs_devices_fops, listuid, listgid); if (devices_usbfs_dentry == NULL) { @@ -617,9 +326,9 @@ static int create_special_files (void) } goto exit; - + error_clean_mounts: - simple_release_fs(&usbfs_mount, &usbfs_mount_count); + simple_release_fs(&usb_fs_type.mount, &usb_fs_type.mount_count); exit: return retval; } @@ -627,9 +336,8 @@ exit: static void remove_special_files (void) { if (devices_usbfs_dentry) - fs_remove_file (devices_usbfs_dentry); + simple_remove(devices_usbfs_dentry); devices_usbfs_dentry = NULL; - simple_release_fs(&usbfs_mount, &usbfs_mount_count); } void usbfs_update_special (void) @@ -659,7 +367,7 @@ static void usbfs_add_bus(struct usb_bus sprintf (name, "%03d", bus->busnum); - parent = usbfs_mount->mnt_sb->s_root; + parent = usbfs_root; bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent, bus, NULL, busuid, busgid); if (bus->usbfs_dentry == NULL) { @@ -671,7 +379,7 @@ static void usbfs_add_bus(struct usb_bus static void usbfs_remove_bus(struct usb_bus *bus) { if (bus->usbfs_dentry) { - fs_remove_file (bus->usbfs_dentry); + simple_remove(bus->usbfs_dentry); bus->usbfs_dentry = NULL; } @@ -716,7 +424,7 @@ static void usbfs_remove_device(struct u struct siginfo sinfo; if (dev->usbfs_dentry) { - fs_remove_file (dev->usbfs_dentry); + simple_remove(dev->usbfs_dentry); dev->usbfs_dentry = NULL; } while (!list_empty(&dev->filelist)) { @@ -764,11 +472,11 @@ static struct proc_dir_entry *usbdir = N int __init usbfs_init(void) { - int retval; - - retval = register_filesystem(&usb_fs_type); - if (retval) - return retval; + usb_fs_type.super_ops = &usbfs_ops; + usbfs_root = simple_register_filesystem(&usb_fs_type); + if (IS_ERR(usbfs_root)) + return PTR_ERR(usbfs_root); + ignore_mount = 0; usb_register_notify(&usbfs_nb); @@ -781,7 +489,7 @@ int __init usbfs_init(void) void usbfs_cleanup(void) { usb_unregister_notify(&usbfs_nb); - unregister_filesystem(&usb_fs_type); + simple_unregister_filesystem(&usb_fs_type); if (usbdir) remove_proc_entry("usb", proc_bus); } -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/