[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / sysfs / sysfs.h

/*
 * 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>

struct sysfs_open_dirent;

/* type-specific structures for sysfs_dirent->s_* union members */
struct sysfs_elem_dir {
	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_elem_attr {
	struct attribute	*attr;
	struct sysfs_open_dirent *open;
};

struct sysfs_elem_bin_attr {
	struct bin_attribute	*bin_attr;
	struct hlist_head	buffers;
};

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;
	struct sysfs_dirent	*s_sibling;
	const char		*s_name;

	const void		*s_ns; /* namespace tag */
	union {
		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;
	unsigned short		s_mode;
	ino_t			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		0xff00
#define SYSFS_NS_TYPE_SHIFT		8

#define SYSFS_FLAG_MASK			~(SYSFS_NS_TYPE_MASK|SYSFS_TYPE_MASK)
#define SYSFS_FLAG_REMOVED		0x020000

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)
#else
#define sysfs_dirent_init_lockdep(sd) do {} while(0)
#endif

/*
 * Context structure to be used while adding/removing nodes.
 */
struct sysfs_addrm_cxt {
	struct sysfs_dirent	*parent_sd;
	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 {
	const 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_assoc_lock;

extern const struct file_operations sysfs_dir_operations;
extern const struct inode_operations sysfs_dir_inode_operations;

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);
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);
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 void *ns,
				       const unsigned char *name);
struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
				      const void *ns,
				      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);

int sysfs_rename(struct sysfs_dirent *sd,
	struct sysfs_dirent *new_parent_sd, const void *ns, const char *new_name);

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, unsigned int flags);
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_hash_and_remove(struct sysfs_dirent *dir_sd, const void *ns, const char *name);
int sysfs_inode_init(void);

/*
 * 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);

int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
			const struct attribute *attr, int type, mode_t amode);
/*
 * bin.c
 */
extern const struct file_operations bin_fops;
void unmap_bin_file(struct sysfs_dirent *attr_sd);

/*
 * symlink.c
 */
extern const struct inode_operations sysfs_symlink_inode_operations;
Commit	Line	Data
6d66f5cd TH	1	/*
	2	* fs/sysfs/sysfs.h - sysfs internal header file
	3	*
	4	* Copyright (c) 2001-3 Patrick Mochel
	5	* Copyright (c) 2007 SUSE Linux Products GmbH
	6	* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
	7	*
	8	* This file is released under the GPLv2.
	9	*/
	10
846f9974	11	#include <linux/lockdep.h>
57cc7215	12	#include <linux/kobject_ns.h>
ddd29ec6 DQ	13	#include <linux/fs.h>
ddd29ec6 DQ	14
85a4ffad TH	15	struct sysfs_open_dirent;
85a4ffad TH	16
59f69015	17	/* type-specific structures for sysfs_dirent->s_* union members */
3e519038	18	struct sysfs_elem_dir {
59f69015	19	struct kobject *kobj;
bc747f37 TH	20	/* children list starts here and goes through sd->s_sibling */
bc747f37 TH	21	struct sysfs_dirent *children;
3e519038 TH	22	};
	23
	24	struct sysfs_elem_symlink {
59f69015	25	struct sysfs_dirent *target_sd;
3e519038 TH	26	};
	27
	28	struct sysfs_elem_attr {
59f69015	29	struct attribute *attr;
85a4ffad	30	struct sysfs_open_dirent *open;
3e519038 TH	31	};
	32
	33	struct sysfs_elem_bin_attr {
59f69015	34	struct bin_attribute *bin_attr;
e0edd3c6	35	struct hlist_head buffers;
3e519038 TH	36	};
3e519038 TH	37
ddd29ec6 DQ	38	struct sysfs_inode_attrs {
	39	struct iattr ia_iattr;
	40	void *ia_secdata;
	41	u32 ia_secdata_len;
	42	};
	43
0ab66088	44	/*
59f69015 TH	45	* sysfs_dirent - the building block of sysfs hierarchy. Each and
	46	* every sysfs node is represented by single sysfs_dirent.
	47	*
0ab66088 TH	48	* As long as s_count reference is held, the sysfs_dirent itself is
	49	* accessible. Dereferencing s_elem or any other outer entity
	50	* requires s_active reference.
	51	*/
d56c3eae AR	52	struct sysfs_dirent {
d56c3eae AR	53	atomic_t s_count;
8619f979	54	atomic_t s_active;
846f9974 EB	55	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	56	struct lockdep_map dep_map;
	57	#endif
59f69015 TH	58	struct sysfs_dirent *s_parent;
59f69015 TH	59	struct sysfs_dirent *s_sibling;
59f69015	60	const char *s_name;
3e519038	61
be867b19	62	const void s_ns; / namespace tag */
3e519038	63	union {
b1fc3d61 TH	64	struct sysfs_elem_dir s_dir;
	65	struct sysfs_elem_symlink s_symlink;
	66	struct sysfs_elem_attr s_attr;
	67	struct sysfs_elem_bin_attr s_bin_attr;
	68	};
3e519038	69
b402d72c	70	unsigned int s_flags;
19c38b63	71	unsigned short s_mode;
dc351252	72	ino_t s_ino;
ddd29ec6	73	struct sysfs_inode_attrs *s_iattr;
d56c3eae	74	};
1da177e4	75
59f69015	76	#define SD_DEACTIVATED_BIAS INT_MIN
0ab66088	77
59f69015	78	#define SYSFS_TYPE_MASK 0x00ff
dc2f75f0 TH	79	#define SYSFS_DIR 0x0001
	80	#define SYSFS_KOBJ_ATTR 0x0002
	81	#define SYSFS_KOBJ_BIN_ATTR 0x0004
	82	#define SYSFS_KOBJ_LINK 0x0008
59f69015	83	#define SYSFS_COPY_NAME (SYSFS_DIR \| SYSFS_KOBJ_LINK)
a2db6842	84	#define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR \| SYSFS_KOBJ_BIN_ATTR)
59f69015	85
be867b19	86	/* identify any namespace tag on sysfs_dirents */
3ff195b0 EB	87	#define SYSFS_NS_TYPE_MASK 0xff00
	88	#define SYSFS_NS_TYPE_SHIFT 8
	89
	90	#define SYSFS_FLAG_MASK ~(SYSFS_NS_TYPE_MASK\|SYSFS_TYPE_MASK)
	91	#define SYSFS_FLAG_REMOVED 0x020000
59f69015 TH	92
	93	static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
	94	{
	95	return sd->s_flags & SYSFS_TYPE_MASK;
	96	}
	97
be867b19 SH	98	/*
	99	* Return any namespace tags on this dirent.
	100	* enum kobj_ns_type is defined in linux/kobject.h
	101	*/
3ff195b0 EB	102	static inline enum kobj_ns_type sysfs_ns_type(struct sysfs_dirent *sd)
	103	{
	104	return (sd->s_flags & SYSFS_NS_TYPE_MASK) >> SYSFS_NS_TYPE_SHIFT;
	105	}
	106
846f9974 EB	107	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	108	#define sysfs_dirent_init_lockdep(sd) \
	109	do { \
6992f533 EB	110	struct attribute *attr = sd->s_attr.attr; \
	111	struct lock_class_key *key = attr->key; \
	112	if (!key) \
	113	key = &attr->skey; \
846f9974	114	\
6992f533	115	lockdep_init_map(&sd->dep_map, "s_active", key, 0); \
846f9974 EB	116	} while(0)
	117	#else
	118	#define sysfs_dirent_init_lockdep(sd) do {} while(0)
	119	#endif
	120
59f69015 TH	121	/*
	122	* Context structure to be used while adding/removing nodes.
	123	*/
fb6896da TH	124	struct sysfs_addrm_cxt {
fb6896da TH	125	struct sysfs_dirent *parent_sd;
fb6896da	126	struct sysfs_dirent *removed;
fb6896da TH	127	};
fb6896da TH	128
59f69015 TH	129	/*
	130	* mount.c
	131	*/
be867b19 SH	132
	133	/*
	134	* Each sb is associated with a set of namespace tags (i.e.
	135	* the network namespace of the task which mounted this sysfs
	136	* instance).
	137	*/
9e7fdd25	138	struct sysfs_super_info {
3ff195b0	139	const void *ns[KOBJ_NS_TYPES];
9e7fdd25 EB	140	};
9e7fdd25 EB	141	#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
51225039	142	extern struct sysfs_dirent sysfs_root;
e18b890b	143	extern struct kmem_cache *sysfs_dir_cachep;
1da177e4	144
59f69015 TH	145	/*
	146	* dir.c
	147	*/
3007e997	148	extern struct mutex sysfs_mutex;
59f69015 TH	149	extern spinlock_t sysfs_assoc_lock;
59f69015 TH	150
4b6f5d20	151	extern const struct file_operations sysfs_dir_operations;
c5ef1c42	152	extern const struct inode_operations sysfs_dir_inode_operations;
1da177e4	153
59f69015	154	struct dentry sysfs_get_dentry(struct sysfs_dirent sd);
e72ceb8c EB	155	struct sysfs_dirent sysfs_get_active(struct sysfs_dirent sd);
e72ceb8c EB	156	void sysfs_put_active(struct sysfs_dirent *sd);
59f69015 TH	157	void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
59f69015 TH	158	struct sysfs_dirent *parent_sd);
36ce6dad	159	int __sysfs_add_one(struct sysfs_addrm_cxt acxt, struct sysfs_dirent sd);
59f69015 TH	160	int sysfs_add_one(struct sysfs_addrm_cxt acxt, struct sysfs_dirent sd);
	161	void sysfs_remove_one(struct sysfs_addrm_cxt acxt, struct sysfs_dirent sd);
	162	void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
	163
	164	struct sysfs_dirent sysfs_find_dirent(struct sysfs_dirent parent_sd,
3ff195b0	165	const void *ns,
59f69015 TH	166	const unsigned char *name);
59f69015 TH	167	struct sysfs_dirent sysfs_get_dirent(struct sysfs_dirent parent_sd,
3ff195b0	168	const void *ns,
59f69015 TH	169	const unsigned char *name);
	170	struct sysfs_dirent sysfs_new_dirent(const char name, umode_t mode, int type);
	171
	172	void release_sysfs_dirent(struct sysfs_dirent *sd);
	173
	174	int sysfs_create_subdir(struct kobject kobj, const char name,
	175	struct sysfs_dirent **p_sd);
	176	void sysfs_remove_subdir(struct sysfs_dirent *sd);
	177
ca1bab38	178	int sysfs_rename(struct sysfs_dirent *sd,
3ff195b0	179	struct sysfs_dirent new_parent_sd, const void ns, const char *new_name);
ca1bab38	180
f1282c84	181	static inline struct sysfs_dirent __sysfs_get(struct sysfs_dirent sd)
1da177e4	182	{
0ab66088 TH	183	if (sd) {
	184	WARN_ON(!atomic_read(&sd->s_count));
	185	atomic_inc(&sd->s_count);
	186	}
	187	return sd;
1da177e4	188	}
f1282c84	189	#define sysfs_get(sd) __sysfs_get(sd)
1da177e4	190
f1282c84	191	static inline void __sysfs_put(struct sysfs_dirent *sd)
1da177e4	192	{
0ab66088 TH	193	if (sd && atomic_dec_and_test(&sd->s_count))
	194	release_sysfs_dirent(sd);
	195	}
f1282c84	196	#define sysfs_put(sd) __sysfs_put(sd)
59f69015 TH	197
	198	/*
	199	* inode.c
	200	*/
fac2622b	201	struct inode sysfs_get_inode(struct super_block sb, struct sysfs_dirent *sd);
01cd9fef	202	void sysfs_evict_inode(struct inode *inode);
35df63c4	203	int sysfs_sd_setattr(struct sysfs_dirent sd, struct iattr iattr);
b74c79e9	204	int sysfs_permission(struct inode *inode, int mask, unsigned int flags);
59f69015	205	int sysfs_setattr(struct dentry dentry, struct iattr iattr);
e61ab4ae	206	int sysfs_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat);
ddd29ec6 DQ	207	int sysfs_setxattr(struct dentry dentry, const char name, const void *value,
ddd29ec6 DQ	208	size_t size, int flags);
3ff195b0	209	int sysfs_hash_and_remove(struct sysfs_dirent dir_sd, const void ns, const char *name);
e0bf68dd	210	int sysfs_inode_init(void);
59f69015 TH	211
	212	/*
	213	* file.c
	214	*/
	215	extern const struct file_operations sysfs_file_operations;
	216
	217	int sysfs_add_file(struct sysfs_dirent *dir_sd,
	218	const struct attribute *attr, int type);
	219
0f423895 JB	220	int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
0f423895 JB	221	const struct attribute *attr, int type, mode_t amode);
59f69015 TH	222	/*
	223	* bin.c
	224	*/
	225	extern const struct file_operations bin_fops;
e0edd3c6	226	void unmap_bin_file(struct sysfs_dirent *attr_sd);
59f69015 TH	227
	228	/*
	229	* symlink.c
	230	*/
	231	extern const struct inode_operations sysfs_symlink_inode_operations;