From patchwork Wed May 13 06:43:28 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 471701 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 8A462140A99 for ; Wed, 13 May 2015 16:43:57 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=sfs-ml-1.v29.ch3.sourceforge.com) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1YsQOW-0000eS-Nb; Wed, 13 May 2015 06:43:52 +0000 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1YsQOV-0000eL-4E for tpmdd-devel@lists.sourceforge.net; Wed, 13 May 2015 06:43:51 +0000 X-ACL-Warn: Received: from mga14.intel.com ([192.55.52.115]) by sog-mx-3.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1YsQOU-0007L3-1t for tpmdd-devel@lists.sourceforge.net; Wed, 13 May 2015 06:43:51 +0000 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP; 12 May 2015 23:43:44 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,419,1427785200"; d="scan'208";a="694107886" Received: from jsakkine-mobl1.tm.intel.com (HELO localhost) ([10.237.48.149]) by orsmga001.jf.intel.com with ESMTP; 12 May 2015 23:43:42 -0700 From: Jarkko Sakkinen To: tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Date: Wed, 13 May 2015 09:43:28 +0300 Message-Id: <1431499411-18070-2-git-send-email-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1431499411-18070-1-git-send-email-jarkko.sakkinen@linux.intel.com> References: <1431499411-18070-1-git-send-email-jarkko.sakkinen@linux.intel.com> X-Spam-Score: -0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Headers-End: 1YsQOU-0007L3-1t Cc: Simon Wunderlich , NeilBrown , gregkh@linuxfoundation.org, Tejun Heo , Guenter Roeck Subject: [tpmdd-devel] [PATCH v5 1/2] sysfs: added sysfs_link_entry_to_kobj() X-BeenThere: tpmdd-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Tpm Device Driver maintainance List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: tpmdd-devel-bounces@lists.sourceforge.net Added a new function sysfs_link_group_to_kobj() that adds a symlink from attribute or group to a kobject. Exported kernfs_remove_by_name_ns in order to provide a way to remove such symlinks. Signed-off-by: Jarkko Sakkinen --- fs/sysfs/group.c | 42 ++++++++++++++++++++++++++++++++++++++++++ include/linux/sysfs.h | 8 ++++++++ 2 files changed, 50 insertions(+) diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index b400c04..5c72996 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -352,3 +352,45 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name, } } EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group); + +/** + * sysfs_link_entry_to_kobj - add a symlink to a kobject pointing to a group or an attribute + * @kobj: The kobject containing the group. + * @target_kobj: The target kobject. + * @target_name: The name of the target group or attribute. + */ +int sysfs_link_entry_to_kobj(struct kobject *kobj, struct kobject *target_kobj, + const char *target_name) +{ + struct kernfs_node *target; + struct kernfs_node *entry; + struct kernfs_node *link; + + /* + * We don't own @target_kobj and it may be removed at any time. + * Synchronize using sysfs_symlink_target_lock. See sysfs_remove_dir() + * for details. + */ + spin_lock(&sysfs_symlink_target_lock); + target = target_kobj->sd; + if (target) + kernfs_get(target); + spin_unlock(&sysfs_symlink_target_lock); + if (!target) + return -ENOENT; + + entry = kernfs_find_and_get(target_kobj->sd, target_name); + if (!entry) { + kernfs_put(target); + return -ENOENT; + } + + link = kernfs_create_link(kobj->sd, target_name, entry); + if (IS_ERR(link) && PTR_ERR(link) == -EEXIST) + sysfs_warn_dup(kobj->sd, target_name); + + kernfs_put(entry); + kernfs_put(target); + return IS_ERR(link) ? PTR_ERR(link) : 0; +} +EXPORT_SYMBOL_GPL(sysfs_link_entry_to_kobj); diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 99382c0..f2be044 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -264,6 +264,8 @@ int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name, struct kobject *target, const char *link_name); void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name, const char *link_name); +int sysfs_link_entry_to_kobj(struct kobject *kobj, struct kobject *target_kobj, + const char *target_name); void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr); @@ -436,6 +438,12 @@ static inline void sysfs_remove_link_from_group(struct kobject *kobj, { } +int sysfs_link_entry_to_kobj(struct kobject *kobj, struct kobject *target_kobj, + const char *target_name) +{ + return 0; +} + static inline void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr) {