[PATCH V5 net-next 1/8] debugfs: Add debugfs_create_devm_dir() helper

From: Jijie Shao
Date: Fri Dec 06 2024 - 06:24:04 EST


Add debugfs_create_devm_dir() helper

Signed-off-by: Jijie Shao <shaojijie@xxxxxxxxxx>
---
fs/debugfs/inode.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/debugfs.h | 10 ++++++++++
2 files changed, 46 insertions(+)

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 38a9c7eb97e6..f682c4952a27 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -610,6 +610,42 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
}
EXPORT_SYMBOL_GPL(debugfs_create_dir);

+static void debugfs_remove_devm(void *dentry_rwa)
+{
+ struct dentry *dentry = dentry_rwa;
+
+ debugfs_remove(dentry);
+}
+
+/**
+ * debugfs_create_devm_dir - Managed debugfs_create_dir()
+ * @dev: Device that owns the action
+ * @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.
+ * Managed debugfs_create_dir(). dentry will automatically be remove on
+ * driver detach.
+ */
+struct dentry *debugfs_create_devm_dir(struct device *dev, const char *name,
+ struct dentry *parent)
+{
+ struct dentry *dentry;
+ int ret;
+
+ dentry = debugfs_create_dir(name, parent);
+ if (IS_ERR(dentry))
+ return dentry;
+
+ ret = devm_add_action_or_reset(dev, debugfs_remove_devm, dentry);
+ if (ret)
+ ERR_PTR(ret);
+
+ return dentry;
+}
+EXPORT_SYMBOL_GPL(debugfs_create_devm_dir);
+
/**
* debugfs_create_automount - create automount point in the debugfs filesystem
* @name: a pointer to a string containing the name of the file to create.
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 59444b495d49..19d8c322debe 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -139,6 +139,9 @@ void debugfs_create_file_size(const char *name, umode_t mode,

struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);

+struct dentry *debugfs_create_devm_dir(struct device *dev, const char *name,
+ struct dentry *parent);
+
struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
const char *dest);

@@ -286,6 +289,13 @@ static inline struct dentry *debugfs_create_dir(const char *name,
return ERR_PTR(-ENODEV);
}

+static inline struct dentry *debugfs_create_devm_dir(struct device *dev,
+ const char *name,
+ struct dentry *parent)
+{
+ return ERR_PTR(-ENODEV);
+}
+
static inline struct dentry *debugfs_create_symlink(const char *name,
struct dentry *parent,
const char *dest)
--
2.33.0