linux-kernel - [PATCH 1/2] sysfs: add sysfs_add_bin_file_to

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Message-Id: <20211220064730.28806-1-zajec5@gmail.com>
Date:   Mon, 20 Dec 2021 07:47:29 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jonathan Corbet <corbet@....net>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 1/2] sysfs: add sysfs_add_bin_file_to_group()

From: Rafał Miłecki <rafal@...ecki.pl>

There already is sysfs_add_file_to_group() for adding "attribute" to a
group. This new function allows adding "bin_attribute" as well.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 fs/sysfs/file.c       | 31 +++++++++++++++++++++++++++----
 include/linux/sysfs.h |  3 +++
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 42dcf96881b6..30c798c38d89 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -376,14 +376,19 @@ EXPORT_SYMBOL_GPL(sysfs_create_files);
  * @attr: attribute descriptor.
  * @group: group name.
  */
-int sysfs_add_file_to_group(struct kobject *kobj,
-		const struct attribute *attr, const char *group)
+int __sysfs_add_file_to_group(struct kobject *kobj,
+			      const struct attribute *attr,
+			      const struct bin_attribute *battr,
+			      const char *group)
 {
 	struct kernfs_node *parent;
 	kuid_t uid;
 	kgid_t gid;
 	int error;
 
+	if (WARN_ON((attr && battr) || (!attr && !battr)))
+		return -EINVAL;
+
 	if (group) {
 		parent = kernfs_find_and_get(kobj->sd, group);
 	} else {
@@ -395,14 +400,32 @@ int sysfs_add_file_to_group(struct kobject *kobj,
 		return -ENOENT;
 
 	kobject_get_ownership(kobj, &uid, &gid);
-	error = sysfs_add_file_mode_ns(parent, attr, attr->mode, uid, gid,
-				       NULL);
+	if (attr)
+		error = sysfs_add_file_mode_ns(parent, attr, attr->mode, uid,
+					       gid, NULL);
+	else
+		error = sysfs_add_bin_file_mode_ns(parent, battr, battr->attr.mode,
+						   uid, gid, NULL);
 	kernfs_put(parent);
 
 	return error;
 }
+
+int sysfs_add_file_to_group(struct kobject *kobj, const struct attribute *attr,
+			    const char *group)
+{
+	return __sysfs_add_file_to_group(kobj, attr, NULL, group);
+}
 EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
 
+int sysfs_add_bin_file_to_group(struct kobject *kobj,
+				const struct bin_attribute *battr,
+				const char *group)
+{
+	return __sysfs_add_file_to_group(kobj, NULL, battr, group);
+}
+EXPORT_SYMBOL_GPL(sysfs_add_bin_file_to_group);
+
 /**
  * sysfs_chmod_file - update the modified mode value on an object attribute.
  * @kobj: object we're acting for.
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index e3f1e8ac1f85..9b4f9d405604 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -302,6 +302,9 @@ void sysfs_remove_groups(struct kobject *kobj,
 			 const struct attribute_group **groups);
 int sysfs_add_file_to_group(struct kobject *kobj,
 			const struct attribute *attr, const char *group);
+int sysfs_add_bin_file_to_group(struct kobject *kobj,
+				const struct bin_attribute *battr,
+				const char *group);
 void sysfs_remove_file_from_group(struct kobject *kobj,
 			const struct attribute *attr, const char *group);
 int sysfs_merge_group(struct kobject *kobj,
-- 
2.31.1