sysfs: Remove first pass at shadow directory support

While shadow directories appear to be a good idea, the current scheme
of controlling their creation and destruction outside of sysfs appears
to be a locking and maintenance nightmare in the face of sysfs
directories dynamically coming and going.  Which can now occur for
directories containing network devices when CONFIG_SYSFS_DEPRECATED is
not set.

This patch removes everything from the initial shadow directory support
that allowed the shadow directory creation to be controlled at a higher
level.  So except for a few bits of sysfs_rename_dir everything from
commit b592fcfe7f06c15ec11774b5be7ce0de3aa86e73 is now gone.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 4 insertions, 28 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 8b45946e8506..56f5eaf10ea9 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -84,14 +84,9 @@ extern void kobject_init(struct kobject *);
 extern void kobject_cleanup(struct kobject *);
 
 extern int __must_check kobject_add(struct kobject *);
-extern int __must_check kobject_shadow_add(struct kobject *kobj,
-					   struct sysfs_dirent *shadow_parent);
 extern void kobject_del(struct kobject *);
 
 extern int __must_check kobject_rename(struct kobject *, const char *new_name);
-extern int __must_check kobject_shadow_rename(struct kobject *kobj,
-					      struct sysfs_dirent *new_parent,
-					      const char *new_name);
 extern int __must_check kobject_move(struct kobject *, struct kobject *);
 
 extern int __must_check kobject_register(struct kobject *);
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index be8228e50a27..c16e4c511621 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -17,9 +17,6 @@
 
 struct kobject;
 struct module;
-struct nameidata;
-struct dentry;
-struct sysfs_dirent;
 
 /* FIXME
  * The *owner field is no longer used, but leave around
@@ -94,14 +91,13 @@ extern int sysfs_schedule_callback(struct kobject *kobj,
 		void (*func)(void *), void *data, struct module *owner);
 
 extern int __must_check
-sysfs_create_dir(struct kobject *kobj, struct sysfs_dirent *shadow_parent_sd);
+sysfs_create_dir(struct kobject *);
 
 extern void
 sysfs_remove_dir(struct kobject *);
 
 extern int __must_check
-sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
-		 const char *new_name);
+sysfs_rename_dir(struct kobject *kobj, const char *new_name);
 
 extern int __must_check
 sysfs_move_dir(struct kobject *, struct kobject *);
@@ -138,12 +134,6 @@ void sysfs_remove_file_from_group(struct kobject *kobj,
 
 void sysfs_notify(struct kobject * k, char *dir, char *attr);
 
-
-extern int sysfs_make_shadowed_dir(struct kobject *kobj,
-	void * (*follow_link)(struct dentry *, struct nameidata *));
-extern struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj);
-extern void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd);
-
 extern int __must_check sysfs_init(void);
 
 #else /* CONFIG_SYSFS */
@@ -154,8 +144,7 @@ static inline int sysfs_schedule_callback(struct kobject *kobj,
 	return -ENOSYS;
 }
 
-static inline int sysfs_create_dir(struct kobject *kobj,
-				   struct sysfs_dirent *shadow_parent_sd)
+static inline int sysfs_create_dir(struct kobject * kobj)
 {
 	return 0;
 }
@@ -165,9 +154,7 @@ static inline void sysfs_remove_dir(struct kobject * k)
 	;
 }
 
-static inline int sysfs_rename_dir(struct kobject *kobj,
-				   struct sysfs_dirent *new_parent_sd,
-				   const char *new_name)
+static inline int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
 {
 	return 0;
 }
@@ -242,12 +229,6 @@ static inline void sysfs_notify(struct kobject * k, char *dir, char *attr)
 {
 }
 
-static inline int sysfs_make_shadowed_dir(struct kobject *kobj,
-	void * (*follow_link)(struct dentry *, struct nameidata *))
-{
-	return 0;
-}
-
 static inline int __must_check sysfs_init(void)
 {
 	return 0;