linux-kernel - [RFC PATCH 1/3] debugfs: make create directory logic more generic

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Date:	Tue,  8 Dec 2015 10:51:04 +0100
From:	Roman Pen <r.peniaev@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Roman Pen <r.peniaev@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/3] debugfs: make create directory logic more generic

Now __create_dir() accepts inode operations and private data.
I will use this generic call in next path to create directory
with temporary files.

Signed-off-by: Roman Pen <r.peniaev@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org
---
 fs/debugfs/inode.c | 48 ++++++++++++++++++++++++++++--------------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index b7fcc0d..f1c4f80 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -388,25 +388,9 @@ struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
 }
 EXPORT_SYMBOL_GPL(debugfs_create_file_size);
 
-/**
- * debugfs_create_dir - create a directory in the debugfs filesystem
- * @name: a pointer to a string containing the name of the directory to
- *        create.
- * @parent: a pointer to the parent dentry for this file.  This should be a
- *          directory dentry if set.  If this parameter is NULL, then the
- *          directory will be created in the root of the debugfs filesystem.
- *
- * This function creates a directory in debugfs with the given name.
- *
- * This function will return a pointer to a dentry if it succeeds.  This
- * pointer must be passed to the debugfs_remove() function when the file is
- * to be removed (no automatic cleanup happens if your module is unloaded,
- * you are responsible here.)  If an error occurs, %NULL will be returned.
- *
- * If debugfs is not enabled in the kernel, the value -%ENODEV will be
- * returned.
- */
-struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
+static struct dentry *__create_dir(const char *name,
+				   struct dentry *parent, void *data,
+				   const struct inode_operations *i_op)
 {
 	struct dentry *dentry = start_creating(name, parent);
 	struct inode *inode;
@@ -419,7 +403,8 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
 		return failed_creating(dentry);
 
 	inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
-	inode->i_op = &simple_dir_inode_operations;
+	inode->i_op = i_op;
+	inode->i_private = data;
 	inode->i_fop = &simple_dir_operations;
 
 	/* directory inodes start off with i_nlink == 2 (for "." entry) */
@@ -429,6 +414,29 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
 	fsnotify_mkdir(d_inode(dentry->d_parent), dentry);
 	return end_creating(dentry);
 }
+
+/**
+ * debugfs_create_dir - create a directory in the debugfs filesystem
+ * @name: a pointer to a string containing the name of the directory to
+ *        create.
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this parameter is NULL, then the
+ *          directory will be created in the root of the debugfs filesystem.
+ *
+ * This function creates a directory in debugfs with the given name.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the debugfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, %NULL will be returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -%ENODEV will be
+ * returned.
+ */
+struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
+{
+	return __create_dir(name, parent, NULL, &simple_dir_inode_operations);
+}
 EXPORT_SYMBOL_GPL(debugfs_create_dir);
 
 /**
-- 
2.6.2

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