1 files changed, 111 insertions, 73 deletions

diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 6b8c8d76d30..f0326f281d1 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -1,20 +1,39 @@
+/*
+ * fs/sysfs/sysfs.h - sysfs internal header file
+ *
+ * Copyright (c) 2001-3 Patrick Mochel
+ * Copyright (c) 2007 SUSE Linux Products GmbH
+ * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
+ *
+ * This file is released under the GPLv2.
+ */
+
+struct sysfs_open_dirent;
+
+/* type-specific structures for sysfs_dirent->s_* union members */
 struct sysfs_elem_dir {
-	struct kobject		* kobj;
+	struct kobject		*kobj;
+	/* children list starts here and goes through sd->s_sibling */
+	struct sysfs_dirent	*children;
 };
 
 struct sysfs_elem_symlink {
-	struct sysfs_dirent	* target_sd;
+	struct sysfs_dirent	*target_sd;
 };
 
 struct sysfs_elem_attr {
-	struct attribute	* attr;
+	struct attribute	*attr;
+	struct sysfs_open_dirent *open;
 };
 
 struct sysfs_elem_bin_attr {
-	struct bin_attribute	* bin_attr;
+	struct bin_attribute	*bin_attr;
 };
 
 /*
+ * sysfs_dirent - the building block of sysfs hierarchy.  Each and
+ * every sysfs node is represented by single sysfs_dirent.
+ *
  * As long as s_count reference is held, the sysfs_dirent itself is
  * accessible.  Dereferencing s_elem or any other outer entity
  * requires s_active reference.
@@ -22,28 +41,43 @@ struct sysfs_elem_bin_attr {
 struct sysfs_dirent {
 	atomic_t		s_count;
 	atomic_t		s_active;
-	struct sysfs_dirent	* s_parent;
-	struct sysfs_dirent	* s_sibling;
-	struct sysfs_dirent	* s_children;
-	const char		* s_name;
+	struct sysfs_dirent	*s_parent;
+	struct sysfs_dirent	*s_sibling;
+	const char		*s_name;
 
 	union {
-		struct sysfs_elem_dir		dir;
-		struct sysfs_elem_symlink	symlink;
-		struct sysfs_elem_attr		attr;
-		struct sysfs_elem_bin_attr	bin_attr;
-	}			s_elem;
+		struct sysfs_elem_dir		s_dir;
+		struct sysfs_elem_symlink	s_symlink;
+		struct sysfs_elem_attr		s_attr;
+		struct sysfs_elem_bin_attr	s_bin_attr;
+	};
 
 	unsigned int		s_flags;
-	umode_t			s_mode;
 	ino_t			s_ino;
-	struct dentry		* s_dentry;
-	struct iattr		* s_iattr;
-	atomic_t		s_event;
+	umode_t			s_mode;
+	struct iattr		*s_iattr;
 };
 
-#define SD_DEACTIVATED_BIAS	INT_MIN
+#define SD_DEACTIVATED_BIAS		INT_MIN
+
+#define SYSFS_TYPE_MASK			0x00ff
+#define SYSFS_DIR			0x0001
+#define SYSFS_KOBJ_ATTR			0x0002
+#define SYSFS_KOBJ_BIN_ATTR		0x0004
+#define SYSFS_KOBJ_LINK			0x0008
+#define SYSFS_COPY_NAME			(SYSFS_DIR | SYSFS_KOBJ_LINK)
+
+#define SYSFS_FLAG_MASK			~SYSFS_TYPE_MASK
+#define SYSFS_FLAG_REMOVED		0x0200
+
+static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
+{
+	return sd->s_flags & SYSFS_TYPE_MASK;
+}
 
+/*
+ * Context structure to be used while adding/removing nodes.
+ */
 struct sysfs_addrm_cxt {
 	struct sysfs_dirent	*parent_sd;
 	struct inode		*parent_inode;
@@ -51,63 +85,47 @@ struct sysfs_addrm_cxt {
 	int			cnt;
 };
 
-extern struct vfsmount * sysfs_mount;
+/*
+ * mount.c
+ */
 extern struct sysfs_dirent sysfs_root;
+extern struct super_block *sysfs_sb;
 extern struct kmem_cache *sysfs_dir_cachep;
 
-extern struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
-extern void sysfs_link_sibling(struct sysfs_dirent *sd);
-extern void sysfs_unlink_sibling(struct sysfs_dirent *sd);
-extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
-extern void sysfs_put_active(struct sysfs_dirent *sd);
-extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
-extern void sysfs_put_active_two(struct sysfs_dirent *sd);
-extern void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
-			      struct sysfs_dirent *parent_sd);
-extern void sysfs_add_one(struct sysfs_addrm_cxt *acxt,
-			  struct sysfs_dirent *sd);
-extern void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
-			     struct sysfs_dirent *sd);
-extern int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
-
-extern void sysfs_delete_inode(struct inode *inode);
-extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
-extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
-
-extern void release_sysfs_dirent(struct sysfs_dirent * sd);
-extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
-					      const unsigned char *name);
-extern struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
-					     const unsigned char *name);
-extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
-					     int type);
-
-extern int sysfs_add_file(struct sysfs_dirent *dir_sd,
-			  const struct attribute *attr, int type);
-extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
-extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
-
-extern int sysfs_create_subdir(struct kobject *kobj, const char *name,
-			       struct sysfs_dirent **p_sd);
-extern void sysfs_remove_subdir(struct sysfs_dirent *sd);
-
-extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
-
-extern spinlock_t sysfs_assoc_lock;
+/*
+ * dir.c
+ */
 extern struct mutex sysfs_mutex;
-extern struct super_block * sysfs_sb;
+extern struct mutex sysfs_rename_mutex;
+extern spinlock_t sysfs_assoc_lock;
+
 extern const struct file_operations sysfs_dir_operations;
-extern const struct file_operations sysfs_file_operations;
-extern const struct file_operations bin_fops;
 extern const struct inode_operations sysfs_dir_inode_operations;
-extern const struct inode_operations sysfs_symlink_inode_operations;
-
-static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
-{
-	return sd->s_flags & SYSFS_TYPE_MASK;
-}
 
-static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
+struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
+struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
+void sysfs_put_active(struct sysfs_dirent *sd);
+struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
+void sysfs_put_active_two(struct sysfs_dirent *sd);
+void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
+		       struct sysfs_dirent *parent_sd);
+int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
+void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
+void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
+
+struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
+				       const unsigned char *name);
+struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
+				      const unsigned char *name);
+struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
+
+void release_sysfs_dirent(struct sysfs_dirent *sd);
+
+int sysfs_create_subdir(struct kobject *kobj, const char *name,
+			struct sysfs_dirent **p_sd);
+void sysfs_remove_subdir(struct sysfs_dirent *sd);
+
+static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
 {
 	if (sd) {
 		WARN_ON(!atomic_read(&sd->s_count));
@@ -116,13 +134,33 @@ static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 	return sd;
 }
 
-static inline void sysfs_put(struct sysfs_dirent * sd)
+static inline void sysfs_put(struct sysfs_dirent *sd)
 {
 	if (sd && atomic_dec_and_test(&sd->s_count))
 		release_sysfs_dirent(sd);
 }
 
-static inline int sysfs_is_shadowed_inode(struct inode *inode)
-{
-	return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
-}
+/*
+ * inode.c
+ */
+struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
+int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
+int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
+
+/*
+ * file.c
+ */
+extern const struct file_operations sysfs_file_operations;
+
+int sysfs_add_file(struct sysfs_dirent *dir_sd,
+		   const struct attribute *attr, int type);
+
+/*
+ * bin.c
+ */
+extern const struct file_operations bin_fops;
+
+/*
+ * symlink.c
+ */
+extern const struct inode_operations sysfs_symlink_inode_operations;