/* * 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. */ #include <linux/lockdep.h>#include <linux/kobject_ns.h>#include <linux/fs.h>#include <linux/rbtree.h> struct sysfs_open_dirent; /* type-specific structures for sysfs_dirent->s_* union members */struct sysfs_elem_dir {	struct kobject		*kobj; 	unsigned long		subdirs;	/* children rbtree starts here and goes through sd->s_rb */	struct rb_root		children;}; struct sysfs_elem_symlink {	struct sysfs_dirent	*target_sd;}; struct sysfs_elem_attr {	union {		struct attribute	*attr;		struct bin_attribute	*bin_attr;	};	struct sysfs_open_dirent *open;}; struct sysfs_inode_attrs {	struct iattr	ia_iattr;	void		*ia_secdata;	u32		ia_secdata_len;}; /* * 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. */struct sysfs_dirent {	atomic_t		s_count;	atomic_t		s_active;#ifdef CONFIG_DEBUG_LOCK_ALLOC	struct lockdep_map	dep_map;#endif	struct sysfs_dirent	*s_parent;	const char		*s_name; 	struct rb_node		s_rb; 	union {		struct completion	*completion;		struct sysfs_dirent	*removed_list;	} u; 	const void		*s_ns; /* namespace tag */	unsigned int		s_hash; /* ns + name hash */	union {		struct sysfs_elem_dir		s_dir;		struct sysfs_elem_symlink	s_symlink;		struct sysfs_elem_attr		s_attr;	}; 	unsigned short		s_flags;	umode_t			s_mode;	unsigned int		s_ino;	struct sysfs_inode_attrs *s_iattr;}; #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_ACTIVE_REF		(SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR) /* identify any namespace tag on sysfs_dirents */#define SYSFS_NS_TYPE_MASK		0xf00#define SYSFS_NS_TYPE_SHIFT		8 #define SYSFS_FLAG_MASK			~(SYSFS_NS_TYPE_MASK|SYSFS_TYPE_MASK)#define SYSFS_FLAG_REMOVED		0x02000 static inline unsigned int sysfs_type(struct sysfs_dirent *sd){	return sd->s_flags & SYSFS_TYPE_MASK;} /* * Return any namespace tags on this dirent. * enum kobj_ns_type is defined in linux/kobject.h */static inline enum kobj_ns_type sysfs_ns_type(struct sysfs_dirent *sd){	return (sd->s_flags & SYSFS_NS_TYPE_MASK) >> SYSFS_NS_TYPE_SHIFT;} #ifdef CONFIG_DEBUG_LOCK_ALLOC #define sysfs_dirent_init_lockdep(sd)				\do {								\	struct attribute *attr = sd->s_attr.attr;		\	struct lock_class_key *key = attr->key;			\	if (!key)						\		key = &attr->skey;				\								\	lockdep_init_map(&sd->dep_map, "s_active", key, 0);	\} while (0) /* Test for attributes that want to ignore lockdep for read-locking */static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd){	int type = sysfs_type(sd); 	return (type == SYSFS_KOBJ_ATTR || type == SYSFS_KOBJ_BIN_ATTR) &&		sd->s_attr.attr->ignore_lockdep;} #else #define sysfs_dirent_init_lockdep(sd) do {} while (0) static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd){	return true;} #endif /* * Context structure to be used while adding/removing nodes. */struct sysfs_addrm_cxt {	struct sysfs_dirent	*removed;}; /* * mount.c */ /* * Each sb is associated with a set of namespace tags (i.e. * the network namespace of the task which mounted this sysfs * instance). */struct sysfs_super_info {	void *ns[KOBJ_NS_TYPES];};#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))extern struct sysfs_dirent sysfs_root;extern struct kmem_cache *sysfs_dir_cachep; /* * dir.c */extern struct mutex sysfs_mutex;extern spinlock_t sysfs_symlink_target_lock;extern const struct dentry_operations sysfs_dentry_ops; extern const struct file_operations sysfs_dir_operations;extern const struct inode_operations sysfs_dir_inode_operations; struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);void sysfs_put_active(struct sysfs_dirent *sd);void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt);void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name);int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,		    struct sysfs_dirent *parent_sd);int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,		  struct sysfs_dirent *parent_sd);void sysfs_remove(struct sysfs_dirent *sd);int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name,			  const void *ns);void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,				       const unsigned char *name,				       const void *ns);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); int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,		 const char *new_name, const void *new_ns); static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd){	if (sd) {		WARN_ON(!atomic_read(&sd->s_count));		atomic_inc(&sd->s_count);	}	return sd;}#define sysfs_get(sd) __sysfs_get(sd) static inline void __sysfs_put(struct sysfs_dirent *sd){	if (sd && atomic_dec_and_test(&sd->s_count))		release_sysfs_dirent(sd);}#define sysfs_put(sd) __sysfs_put(sd) /* * inode.c */struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd);void sysfs_evict_inode(struct inode *inode);int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr);int sysfs_permission(struct inode *inode, int mask);int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,		  struct kstat *stat);int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,		   size_t size, int flags);int sysfs_inode_init(void); /* * file.c */extern const struct file_operations sysfs_file_operations;extern const struct file_operations sysfs_bin_operations; int sysfs_add_file(struct sysfs_dirent *dir_sd,		   const struct attribute *attr, int type); int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,			   const struct attribute *attr, int type,			   umode_t amode, const void *ns);void sysfs_unmap_bin_file(struct sysfs_dirent *sd); /* * symlink.c */extern const struct inode_operations sysfs_symlink_inode_operations;int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,			 const char *name);