kernfs: add @mode to kernfs_create_dir[_ns]()

sysfs assumed 0755 for all newly created directories and kernfs
inherited it.  This assumption is unnecessarily restrictive and
inconsistent with kernfs_create_file[_ns]().  This patch adds @mode
parameter to kernfs_create_dir[_ns]() and update uses in sysfs
accordingly.  Among others, this will be useful for implementations of
the planned ->mkdir() method.

This patch doesn't introduce any behavior differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/sysfs/dir.c

@@ -73,7 +73,8 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
 	if (!parent)
 		return -ENOENT;
 
-	kn = kernfs_create_dir_ns(parent, kobject_name(kobj), kobj, ns);
+	kn = kernfs_create_dir_ns(parent, kobject_name(kobj),
+				  S_IRWXU | S_IRUGO | S_IXUGO, kobj, ns);
 	if (IS_ERR(kn)) {
 		if (PTR_ERR(kn) == -EEXIST)
 			sysfs_warn_dup(parent, kobject_name(kobj));

fs/sysfs/group.c

@@ -100,7 +100,8 @@ static int internal_create_group(struct kobject *kobj, int update,
 		return -EINVAL;
 	}
 	if (grp->name) {
-		kn = kernfs_create_dir(kobj->sd, grp->name, kobj);
+		kn = kernfs_create_dir(kobj->sd, grp->name,
+				       S_IRWXU | S_IRUGO | S_IXUGO, kobj);
 		if (IS_ERR(kn)) {
 			if (PTR_ERR(kn) == -EEXIST)
 				sysfs_warn_dup(kobj->sd, grp->name);