From patchwork Mon Feb 17 16:14:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Brauner X-Patchwork-Id: 1239365 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ubuntu.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48Lpx86l8lz9sRY for ; Tue, 18 Feb 2020 03:15:24 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729300AbgBQQPV (ORCPT ); Mon, 17 Feb 2020 11:15:21 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:49218 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728778AbgBQQOr (ORCPT ); Mon, 17 Feb 2020 11:14:47 -0500 Received: from ip5f5bf7ec.dynamic.kabel-deutschland.de ([95.91.247.236] helo=wittgenstein.fritz.box) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1j3j2j-0003Cp-F4; Mon, 17 Feb 2020 16:14:45 +0000 From: Christian Brauner To: "David S. Miller" , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Cc: "Rafael J. Wysocki" , Pavel Machek , Jakub Kicinski , Eric Dumazet , Stephen Hemminger , linux-pm@vger.kernel.org, Christian Brauner Subject: [PATCH net-next v2 06/10] device: add device_change_owner() Date: Mon, 17 Feb 2020 17:14:32 +0100 Message-Id: <20200217161436.1748598-7-christian.brauner@ubuntu.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200217161436.1748598-1-christian.brauner@ubuntu.com> References: <20200217161436.1748598-1-christian.brauner@ubuntu.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add a helper to change the owner of a device's sysfs entries. This needs to happen when the ownership of a device is changed, e.g. when moving network devices between network namespaces. The ownership of a device is determined based on the ownership of the corresponding kobject, i.e. only if the ownership of a kobject is changed will this function change the ownership of the corresponding device's sysfs entries. This function will be used to correctly account for ownership changes, e.g. when moving network devices between network namespaces. Signed-off-by: Christian Brauner --- /* v2 */ unchanged --- drivers/base/core.c | 73 ++++++++++++++++++++++++++++++++++++++++++ include/linux/device.h | 1 + 2 files changed, 74 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 42a672456432..915766c20a47 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3458,6 +3458,79 @@ int device_move(struct device *dev, struct device *new_parent, } EXPORT_SYMBOL_GPL(device_move); +static int device_attrs_change_owner(struct device *dev) +{ + struct kobject *kobj = &dev->kobj; + struct class *class = dev->class; + const struct device_type *type = dev->type; + int error; + + if (class) { + error = sysfs_groups_change_owner(kobj, class->dev_groups); + if (error) + return error; + } + + if (type) { + error = sysfs_groups_change_owner(kobj, type->groups); + if (error) + return error; + } + + error = sysfs_groups_change_owner(kobj, dev->groups); + if (error) + return error; + + if (device_supports_offline(dev) && !dev->offline_disabled) { + error = sysfs_file_change_owner_by_name(kobj, dev_attr_online.attr.name); + if (error) + return error; + } + + return 0; +} + +/** + * device_change_owner - change the owner of an existing device. + * @dev: device. + */ +int device_change_owner(struct device *dev) +{ + int error; + struct kobject *kobj = &dev->kobj; + + dev = get_device(dev); + if (!dev) + return -EINVAL; + + error = sysfs_change_owner(kobj); + if (error) + goto out; + + error = sysfs_file_change_owner_by_name(kobj, dev_attr_uevent.attr.name); + if (error) + goto out; + + error = device_attrs_change_owner(dev); + if (error) + goto out; + +#ifdef CONFIG_BLOCK + if (sysfs_deprecated && dev->class == &block_class) + goto out; +#endif + + error = sysfs_link_change_owner(&dev->class->p->subsys.kobj, &dev->kobj, + dev_name(dev)); + if (error) + goto out; + +out: + put_device(dev); + return error; +} +EXPORT_SYMBOL_GPL(device_change_owner); + /** * device_shutdown - call ->shutdown() on each device to shutdown. */ diff --git a/include/linux/device.h b/include/linux/device.h index 0cd7c647c16c..63ebd9e3f6b0 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -817,6 +817,7 @@ extern struct device *device_find_child_by_name(struct device *parent, extern int device_rename(struct device *dev, const char *new_name); extern int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order); +extern int device_change_owner(struct device *dev); extern const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid, const char **tmp);