From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932449AbaICKaW (ORCPT ); Wed, 3 Sep 2014 06:30:22 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:11925 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755808AbaICK3j (ORCPT ); Wed, 3 Sep 2014 06:29:39 -0400 X-IronPort-AV: E=Sophos;i="5.04,456,1406563200"; d="scan'208";a="35453954" From: Chen Hanxiao To: , CC: "Eric W. Biederman" , Serge Hallyn , Oleg Nesterov , Al Viro , David Howells , Richard Weinberger , Pavel Emelyanov , Vasiliy Kulikov Subject: [RFC PATCH 1/3] procfs: check uniq proc_dir_entry subdir name Date: Wed, 3 Sep 2014 18:29:58 +0800 Message-ID: <1409740200-26461-2-git-send-email-chenhanxiao@cn.fujitsu.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1409740200-26461-1-git-send-email-chenhanxiao@cn.fujitsu.com> References: <1409740200-26461-1-git-send-email-chenhanxiao@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Check whether a proc dir has a subdir with a specific name. Will be used in a later patch. Signed-off-by: Chen Hanxiao --- fs/proc/generic.c | 15 +++++++++++++++ include/linux/proc_fs.h | 3 +++ 2 files changed, 18 insertions(+) diff --git a/fs/proc/generic.c b/fs/proc/generic.c index b7f268e..4d576c2 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -173,6 +173,21 @@ static const struct inode_operations proc_link_inode_operations = { .follow_link = proc_follow_link, }; +/* check whether dir has @name member */ +struct proc_dir_entry *proc_uniq_dir(struct proc_dir_entry *de, char *name) +{ + spin_lock(&proc_subdir_lock); + for (de = de->subdir; de ; de = de->next) { + if (!strcmp(de->name, name)) { + spin_unlock(&proc_subdir_lock); + return de; + } + } + spin_unlock(&proc_subdir_lock); + return NULL; +} +EXPORT_SYMBOL(proc_uniq_dir); + /* * Don't create negative dentries here, return -ENOENT by hand * instead. diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index 9d117f6..38e87aa 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -41,6 +41,7 @@ extern void *proc_get_parent_data(const struct inode *); extern void proc_remove(struct proc_dir_entry *); extern void remove_proc_entry(const char *, struct proc_dir_entry *); extern int remove_proc_subtree(const char *, struct proc_dir_entry *); +extern struct proc_dir_entry *proc_uniq_dir(struct proc_dir_entry *, char *); #else /* CONFIG_PROC_FS */ @@ -71,6 +72,8 @@ static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); ret static inline void proc_remove(struct proc_dir_entry *de) {} #define remove_proc_entry(name, parent) do {} while (0) static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; } +static inline struct proc_dir_entry *proc_uniq_dir(struct proc_dir_entry *, + char *) {return 0; } #endif /* CONFIG_PROC_FS */ -- 1.9.0