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* [PATCH 1/2] procfs: Add function to lookup a subdirectory name
@ 2013-12-20 22:59 Abbas Raza
  2013-12-20 22:59 ` [PATCH 2/2] ext4: handle mount failures more gracefully Abbas Raza
  2013-12-22  1:20 ` [PATCH 1/2] procfs: Add function to lookup a subdirectory name Theodore Ts'o
  0 siblings, 2 replies; 3+ messages in thread
From: Abbas Raza @ 2013-12-20 22:59 UTC (permalink / raw)
  To: linux-fsdevel, linux-ext4; +Cc: Abbas Raza, Theodore Ts'o, Alexander Viro

From: Abbas Raza <Abbas_Raza@mentor.com>

Add function to lookup a subdirectory in a directory by given name

Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Abbas Raza <Abbas_Raza@mentor.com>
---
 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


^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-12-22  1:20 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-12-20 22:59 [PATCH 1/2] procfs: Add function to lookup a subdirectory name Abbas Raza
2013-12-20 22:59 ` [PATCH 2/2] ext4: handle mount failures more gracefully Abbas Raza
2013-12-22  1:20 ` [PATCH 1/2] procfs: Add function to lookup a subdirectory name Theodore Ts'o

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