From: Abbas Raza Subject: [PATCH 1/2] procfs: Add function to lookup a subdirectory name Date: Sat, 21 Dec 2013 03:59:16 +0500 Message-ID: <1387580357-28440-1-git-send-email-abbas_raza@mentor.com> Cc: Abbas Raza , Theodore Ts'o , Alexander Viro To: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org Return-path: Received: from relay1.mentorg.com ([192.94.38.131]:59750 "EHLO relay1.mentorg.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750866Ab3LTW7i (ORCPT ); Fri, 20 Dec 2013 17:59:38 -0500 Sender: linux-ext4-owner@vger.kernel.org List-ID: From: Abbas Raza Add function to lookup a subdirectory in a directory by given name Cc: Theodore Ts'o Cc: Alexander Viro Signed-off-by: Abbas Raza --- fs/proc/generic.c | 18 ++++++++++++++++++ include/linux/proc_fs.h | 4 ++++ 2 files changed, 22 insertions(+) diff --git a/fs/proc/generic.c b/fs/proc/generic.c index b796da2..e4f2320 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -406,6 +406,24 @@ static const struct dentry_operations proc_dentry_operations = }; /* + * Lookup if a subdirectory is present in the given directory by name + */ +int proc_lookup_subdir_by_name(struct proc_dir_entry *dir, const char *name) +{ + struct proc_dir_entry *tmp; + int ret = -ENOENT; + + spin_lock(&proc_subdir_lock); + for (tmp = dir->subdir; tmp; tmp = tmp->next) + if (strcmp(tmp->name, name) == 0) + ret = 0; + spin_unlock(&proc_subdir_lock); + + return ret; +} +EXPORT_SYMBOL(proc_lookup_subdir_by_name); + +/* * 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 32676b3..82acc6c 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -152,6 +152,8 @@ extern struct proc_dir_entry *proc_symlink(const char *, extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *); extern struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, struct proc_dir_entry *parent); +extern int proc_lookup_subdir_by_name(struct proc_dir_entry *, + const char *name); static inline struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct file_operations *proc_fops) @@ -213,6 +215,8 @@ static inline struct proc_dir_entry *proc_mkdir(const char *name, struct proc_dir_entry *parent) {return NULL;} static inline struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, struct proc_dir_entry *parent) { return NULL; } +static inline int proc_lookup_subdir_by_name(struct proc_dir_entry *, + const char *name) { return -ENOENT; } static inline struct proc_dir_entry *create_proc_read_entry(const char *name, umode_t mode, struct proc_dir_entry *base, -- 1.8.3.2