[mirror_ubuntu-zesty-kernel.git] / include / linux / kernfs.h

/*
 * kernfs.h - pseudo filesystem decoupled from vfs locking
 *
 * This file is released under the GPLv2.
 */

#ifndef __LINUX_KERNFS_H
#define __LINUX_KERNFS_H

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/idr.h>
#include <linux/lockdep.h>
#include <linux/rbtree.h>
#include <linux/atomic.h>
#include <linux/completion.h>

struct file;
struct iattr;
struct seq_file;
struct vm_area_struct;
struct super_block;
struct file_system_type;

struct kernfs_open_node;
struct kernfs_iattrs;

enum kernfs_node_type {
	KERNFS_DIR		= 0x0001,
	KERNFS_FILE		= 0x0002,
	KERNFS_LINK		= 0x0004,
};

#define KERNFS_TYPE_MASK	0x000f
#define KERNFS_ACTIVE_REF	KERNFS_FILE
#define KERNFS_FLAG_MASK	~KERNFS_TYPE_MASK

enum kernfs_node_flag {
	KERNFS_REMOVED		= 0x0010,
	KERNFS_NS		= 0x0020,
	KERNFS_HAS_SEQ_SHOW	= 0x0040,
	KERNFS_HAS_MMAP		= 0x0080,
	KERNFS_LOCKDEP		= 0x0100,
	KERNFS_STATIC_NAME	= 0x0200,
};

/* type-specific structures for kernfs_node union members */
struct kernfs_elem_dir {
	unsigned long		subdirs;
	/* children rbtree starts here and goes through kn->rb */
	struct rb_root		children;

	/*
	 * The kernfs hierarchy this directory belongs to.  This fits
	 * better directly in kernfs_node but is here to save space.
	 */
	struct kernfs_root	*root;
};

struct kernfs_elem_symlink {
	struct kernfs_node	*target_kn;
};

struct kernfs_elem_attr {
	const struct kernfs_ops	*ops;
	struct kernfs_open_node	*open;
	loff_t			size;
};

/*
 * kernfs_node - the building block of kernfs hierarchy.  Each and every
 * kernfs node is represented by single kernfs_node.  Most fields are
 * private to kernfs and shouldn't be accessed directly by kernfs users.
 *
 * As long as s_count reference is held, the kernfs_node itself is
 * accessible.  Dereferencing elem or any other outer entity requires
 * active reference.
 */
struct kernfs_node {
	atomic_t		count;
	atomic_t		active;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map	dep_map;
#endif
	/* the following two fields are published */
	struct kernfs_node	*parent;
	const char		*name;

	struct rb_node		rb;

	union {
		struct completion	*completion;
		struct kernfs_node	*removed_list;
	} u;

	const void		*ns;	/* namespace tag */
	unsigned int		hash;	/* ns + name hash */
	union {
		struct kernfs_elem_dir		dir;
		struct kernfs_elem_symlink	symlink;
		struct kernfs_elem_attr		attr;
	};

	void			*priv;

	unsigned short		flags;
	umode_t			mode;
	unsigned int		ino;
	struct kernfs_iattrs	*iattr;
};

struct kernfs_root {
	/* published fields */
	struct kernfs_node	*kn;

	/* private fields, do not use outside kernfs proper */
	struct ida		ino_ida;
};

struct kernfs_open_file {
	/* published fields */
	struct kernfs_node	*kn;
	struct file		*file;

	/* private fields, do not use outside kernfs proper */
	struct mutex		mutex;
	int			event;
	struct list_head	list;

	bool			mmapped;
	const struct vm_operations_struct *vm_ops;
};

struct kernfs_ops {
	/*
	 * Read is handled by either seq_file or raw_read().
	 *
	 * If seq_show() is present, seq_file path is active.  Other seq
	 * operations are optional and if not implemented, the behavior is
	 * equivalent to single_open().  @sf->private points to the
	 * associated kernfs_open_file.
	 *
	 * read() is bounced through kernel buffer and a read larger than
	 * PAGE_SIZE results in partial operation of PAGE_SIZE.
	 */
	int (*seq_show)(struct seq_file *sf, void *v);

	void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
	void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
	void (*seq_stop)(struct seq_file *sf, void *v);

	ssize_t (*read)(struct kernfs_open_file *of, char *buf, size_t bytes,
			loff_t off);

	/*
	 * write() is bounced through kernel buffer and a write larger than
	 * PAGE_SIZE results in partial operation of PAGE_SIZE.
	 */
	ssize_t (*write)(struct kernfs_open_file *of, char *buf, size_t bytes,
			 loff_t off);

	int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma);

#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lock_class_key	lockdep_key;
#endif
};

#ifdef CONFIG_SYSFS

static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)
{
	return kn->flags & KERNFS_TYPE_MASK;
}

/**
 * kernfs_enable_ns - enable namespace under a directory
 * @kn: directory of interest, should be empty
 *
 * This is to be called right after @kn is created to enable namespace
 * under it.  All children of @kn must have non-NULL namespace tags and
 * only the ones which match the super_block's tag will be visible.
 */
static inline void kernfs_enable_ns(struct kernfs_node *kn)
{
	WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR);
	WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children));
	kn->flags |= KERNFS_NS;
}

/**
 * kernfs_ns_enabled - test whether namespace is enabled
 * @kn: the node to test
 *
 * Test whether namespace filtering is enabled for the children of @ns.
 */
static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
{
	return kn->flags & KERNFS_NS;
}

struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent,
					   const char *name, const void *ns);
void kernfs_get(struct kernfs_node *kn);
void kernfs_put(struct kernfs_node *kn);

struct kernfs_root *kernfs_create_root(void *priv);
void kernfs_destroy_root(struct kernfs_root *root);

struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent,
					 const char *name, umode_t mode,
					 void *priv, const void *ns);
struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent,
					 const char *name,
					 umode_t mode, loff_t size,
					 const struct kernfs_ops *ops,
					 void *priv, const void *ns,
					 bool name_is_static,
					 struct lock_class_key *key);
struct kernfs_node *kernfs_create_link(struct kernfs_node *parent,
				       const char *name,
				       struct kernfs_node *target);
void kernfs_remove(struct kernfs_node *kn);
int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name,
			     const void *ns);
int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
		     const char *new_name, const void *new_ns);
int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
void kernfs_notify(struct kernfs_node *kn);

const void *kernfs_super_ns(struct super_block *sb);
struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags,
			       struct kernfs_root *root, const void *ns);
void kernfs_kill_sb(struct super_block *sb);

void kernfs_init(void);

#else	/* CONFIG_SYSFS */

static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)
{ return 0; }	/* whatever */

static inline void kernfs_enable_ns(struct kernfs_node *kn) { }

static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
{ return false; }

static inline struct kernfs_node *
kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name,
		       const void *ns)
{ return NULL; }

static inline void kernfs_get(struct kernfs_node *kn) { }
static inline void kernfs_put(struct kernfs_node *kn) { }

static inline struct kernfs_root *kernfs_create_root(void *priv)
{ return ERR_PTR(-ENOSYS); }

static inline void kernfs_destroy_root(struct kernfs_root *root) { }

static inline struct kernfs_node *
kernfs_create_dir_ns(struct kernfs_node *parent, const char *name,
		     umode_t mode, void *priv, const void *ns)
{ return ERR_PTR(-ENOSYS); }

static inline struct kernfs_node *
__kernfs_create_file(struct kernfs_node *parent, const char *name,
		     umode_t mode, loff_t size, const struct kernfs_ops *ops,
		     void *priv, const void *ns, bool name_is_static,
		     struct lock_class_key *key)
{ return ERR_PTR(-ENOSYS); }

static inline struct kernfs_node *
kernfs_create_link(struct kernfs_node *parent, const char *name,
		   struct kernfs_node *target)
{ return ERR_PTR(-ENOSYS); }

static inline void kernfs_remove(struct kernfs_node *kn) { }

static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn,
					   const char *name, const void *ns)
{ return -ENOSYS; }

static inline int kernfs_rename_ns(struct kernfs_node *kn,
				   struct kernfs_node *new_parent,
				   const char *new_name, const void *new_ns)
{ return -ENOSYS; }

static inline int kernfs_setattr(struct kernfs_node *kn,
				 const struct iattr *iattr)
{ return -ENOSYS; }

static inline void kernfs_notify(struct kernfs_node *kn) { }

static inline const void *kernfs_super_ns(struct super_block *sb)
{ return NULL; }

static inline struct dentry *
kernfs_mount_ns(struct file_system_type *fs_type, int flags,
		struct kernfs_root *root, const void *ns)
{ return ERR_PTR(-ENOSYS); }

static inline void kernfs_kill_sb(struct super_block *sb) { }

static inline void kernfs_init(void) { }

#endif	/* CONFIG_SYSFS */

static inline struct kernfs_node *
kernfs_find_and_get(struct kernfs_node *kn, const char *name)
{
	return kernfs_find_and_get_ns(kn, name, NULL);
}

static inline struct kernfs_node *
kernfs_create_dir(struct kernfs_node *parent, const char *name, umode_t mode,
		  void *priv)
{
	return kernfs_create_dir_ns(parent, name, mode, priv, NULL);
}

static inline struct kernfs_node *
kernfs_create_file_ns(struct kernfs_node *parent, const char *name,
		      umode_t mode, loff_t size, const struct kernfs_ops *ops,
		      void *priv, const void *ns)
{
	struct lock_class_key *key = NULL;

#ifdef CONFIG_DEBUG_LOCK_ALLOC
	key = (struct lock_class_key *)&ops->lockdep_key;
#endif
	return __kernfs_create_file(parent, name, mode, size, ops, priv, ns,
				    false, key);
}

static inline struct kernfs_node *
kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode,
		   loff_t size, const struct kernfs_ops *ops, void *priv)
{
	return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL);
}

static inline int kernfs_remove_by_name(struct kernfs_node *parent,
					const char *name)
{
	return kernfs_remove_by_name_ns(parent, name, NULL);
}

static inline struct dentry *
kernfs_mount(struct file_system_type *fs_type, int flags,
	     struct kernfs_root *root)
{
	return kernfs_mount_ns(fs_type, flags, root, NULL);
}

#endif	/* __LINUX_KERNFS_H */
Commit	Line	Data
b8441ed2 TH	1	/*
	2	* kernfs.h - pseudo filesystem decoupled from vfs locking
	3	*
	4	* This file is released under the GPLv2.
	5	*/
	6
	7	#ifndef __LINUX_KERNFS_H
	8	#define __LINUX_KERNFS_H
	9
879f40d1	10	#include <linux/kernel.h>
5d0e26bb	11	#include <linux/err.h>
dd8a5b03 TH	12	#include <linux/list.h>
dd8a5b03 TH	13	#include <linux/mutex.h>
bc755553	14	#include <linux/idr.h>
517e64f5	15	#include <linux/lockdep.h>
cf9e5a73 TH	16	#include <linux/rbtree.h>
	17	#include <linux/atomic.h>
	18	#include <linux/completion.h>
879f40d1	19
5d60418e TH	20	struct file;
5d60418e TH	21	struct iattr;
dd8a5b03 TH	22	struct seq_file;
dd8a5b03 TH	23	struct vm_area_struct;
4b93dc9b TH	24	struct super_block;
4b93dc9b TH	25	struct file_system_type;
5d60418e	26
c525aadd TH	27	struct kernfs_open_node;
c525aadd TH	28	struct kernfs_iattrs;
cf9e5a73 TH	29
cf9e5a73 TH	30	enum kernfs_node_type {
df23fc39 TH	31	KERNFS_DIR = 0x0001,
	32	KERNFS_FILE = 0x0002,
	33	KERNFS_LINK = 0x0004,
cf9e5a73 TH	34	};
cf9e5a73 TH	35
df23fc39	36	#define KERNFS_TYPE_MASK 0x000f
df23fc39 TH	37	#define KERNFS_ACTIVE_REF KERNFS_FILE
df23fc39 TH	38	#define KERNFS_FLAG_MASK ~KERNFS_TYPE_MASK
cf9e5a73 TH	39
cf9e5a73 TH	40	enum kernfs_node_flag {
df23fc39 TH	41	KERNFS_REMOVED = 0x0010,
	42	KERNFS_NS = 0x0020,
	43	KERNFS_HAS_SEQ_SHOW = 0x0040,
	44	KERNFS_HAS_MMAP = 0x0080,
	45	KERNFS_LOCKDEP = 0x0100,
2063d608	46	KERNFS_STATIC_NAME = 0x0200,
cf9e5a73 TH	47	};
cf9e5a73 TH	48
324a56e1 TH	49	/* type-specific structures for kernfs_node union members */
324a56e1 TH	50	struct kernfs_elem_dir {
cf9e5a73	51	unsigned long subdirs;
adc5e8b5	52	/* children rbtree starts here and goes through kn->rb */
cf9e5a73 TH	53	struct rb_root children;
	54
	55	/*
	56	* The kernfs hierarchy this directory belongs to. This fits
324a56e1	57	* better directly in kernfs_node but is here to save space.
cf9e5a73 TH	58	*/
	59	struct kernfs_root *root;
	60	};
	61
324a56e1 TH	62	struct kernfs_elem_symlink {
324a56e1 TH	63	struct kernfs_node *target_kn;
cf9e5a73 TH	64	};
cf9e5a73 TH	65
324a56e1	66	struct kernfs_elem_attr {
cf9e5a73	67	const struct kernfs_ops *ops;
c525aadd	68	struct kernfs_open_node *open;
cf9e5a73 TH	69	loff_t size;
	70	};
	71
	72	/*
324a56e1 TH	73	* kernfs_node - the building block of kernfs hierarchy. Each and every
324a56e1 TH	74	* kernfs node is represented by single kernfs_node. Most fields are
cf9e5a73 TH	75	* private to kernfs and shouldn't be accessed directly by kernfs users.
cf9e5a73 TH	76	*
324a56e1 TH	77	* As long as s_count reference is held, the kernfs_node itself is
	78	* accessible. Dereferencing elem or any other outer entity requires
	79	* active reference.
cf9e5a73	80	*/
324a56e1	81	struct kernfs_node {
adc5e8b5 TH	82	atomic_t count;
adc5e8b5 TH	83	atomic_t active;
cf9e5a73 TH	84	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	85	struct lockdep_map dep_map;
	86	#endif
	87	/* the following two fields are published */
adc5e8b5 TH	88	struct kernfs_node *parent;
adc5e8b5 TH	89	const char *name;
cf9e5a73	90
adc5e8b5	91	struct rb_node rb;
cf9e5a73 TH	92
	93	union {
	94	struct completion *completion;
324a56e1	95	struct kernfs_node *removed_list;
cf9e5a73 TH	96	} u;
cf9e5a73 TH	97
adc5e8b5 TH	98	const void ns; / namespace tag */
adc5e8b5 TH	99	unsigned int hash; /* ns + name hash */
cf9e5a73	100	union {
adc5e8b5 TH	101	struct kernfs_elem_dir dir;
	102	struct kernfs_elem_symlink symlink;
	103	struct kernfs_elem_attr attr;
cf9e5a73 TH	104	};
	105
	106	void *priv;
	107
adc5e8b5 TH	108	unsigned short flags;
	109	umode_t mode;
	110	unsigned int ino;
c525aadd	111	struct kernfs_iattrs *iattr;
cf9e5a73	112	};
b8441ed2	113
ba7443bc TH	114	struct kernfs_root {
ba7443bc TH	115	/* published fields */
324a56e1	116	struct kernfs_node *kn;
bc755553 TH	117
	118	/* private fields, do not use outside kernfs proper */
	119	struct ida ino_ida;
ba7443bc TH	120	};
ba7443bc TH	121
c525aadd	122	struct kernfs_open_file {
dd8a5b03	123	/* published fields */
324a56e1	124	struct kernfs_node *kn;
dd8a5b03 TH	125	struct file *file;
	126
	127	/* private fields, do not use outside kernfs proper */
	128	struct mutex mutex;
	129	int event;
	130	struct list_head list;
	131
	132	bool mmapped;
	133	const struct vm_operations_struct *vm_ops;
	134	};
	135
f6acf8bb TH	136	struct kernfs_ops {
	137	/*
	138	* Read is handled by either seq_file or raw_read().
	139	*
d19b9846 TH	140	* If seq_show() is present, seq_file path is active. Other seq
	141	* operations are optional and if not implemented, the behavior is
	142	* equivalent to single_open(). @sf->private points to the
c525aadd	143	* associated kernfs_open_file.
f6acf8bb TH	144	*
	145	* read() is bounced through kernel buffer and a read larger than
	146	* PAGE_SIZE results in partial operation of PAGE_SIZE.
	147	*/
	148	int (seq_show)(struct seq_file sf, void *v);
d19b9846 TH	149
	150	void (seq_start)(struct seq_file sf, loff_t ppos);
	151	void (seq_next)(struct seq_file sf, void v, loff_t *ppos);
	152	void (seq_stop)(struct seq_file sf, void *v);
f6acf8bb	153
c525aadd	154	ssize_t (read)(struct kernfs_open_file of, char *buf, size_t bytes,
f6acf8bb TH	155	loff_t off);
	156
	157	/*
	158	* write() is bounced through kernel buffer and a write larger than
	159	* PAGE_SIZE results in partial operation of PAGE_SIZE.
	160	*/
c525aadd	161	ssize_t (write)(struct kernfs_open_file of, char *buf, size_t bytes,
f6acf8bb TH	162	loff_t off);
f6acf8bb TH	163
c525aadd	164	int (mmap)(struct kernfs_open_file of, struct vm_area_struct *vma);
517e64f5 TH	165
	166	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	167	struct lock_class_key lockdep_key;
	168	#endif
f6acf8bb TH	169	};
f6acf8bb TH	170
879f40d1 TH	171	#ifdef CONFIG_SYSFS
879f40d1 TH	172
df23fc39	173	static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)
cf9e5a73	174	{
df23fc39	175	return kn->flags & KERNFS_TYPE_MASK;
cf9e5a73 TH	176	}
	177
	178	/**
	179	* kernfs_enable_ns - enable namespace under a directory
324a56e1	180	* @kn: directory of interest, should be empty
cf9e5a73	181	*
324a56e1 TH	182	* This is to be called right after @kn is created to enable namespace
324a56e1 TH	183	* under it. All children of @kn must have non-NULL namespace tags and
cf9e5a73 TH	184	* only the ones which match the super_block's tag will be visible.
cf9e5a73 TH	185	*/
324a56e1	186	static inline void kernfs_enable_ns(struct kernfs_node *kn)
cf9e5a73	187	{
df23fc39	188	WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR);
adc5e8b5	189	WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children));
df23fc39	190	kn->flags \|= KERNFS_NS;
cf9e5a73 TH	191	}
cf9e5a73 TH	192
ac9bba03 TH	193	/**
ac9bba03 TH	194	* kernfs_ns_enabled - test whether namespace is enabled
324a56e1	195	* @kn: the node to test
ac9bba03 TH	196	*
	197	* Test whether namespace filtering is enabled for the children of @ns.
	198	*/
324a56e1	199	static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
ac9bba03	200	{
df23fc39	201	return kn->flags & KERNFS_NS;
ac9bba03 TH	202	}
ac9bba03 TH	203
324a56e1 TH	204	struct kernfs_node kernfs_find_and_get_ns(struct kernfs_node parent,
	205	const char name, const void ns);
	206	void kernfs_get(struct kernfs_node *kn);
	207	void kernfs_put(struct kernfs_node *kn);
ccf73cf3	208
ba7443bc TH	209	struct kernfs_root kernfs_create_root(void priv);
	210	void kernfs_destroy_root(struct kernfs_root *root);
	211
324a56e1	212	struct kernfs_node kernfs_create_dir_ns(struct kernfs_node parent,
bb8b9d09 TH	213	const char *name, umode_t mode,
bb8b9d09 TH	214	void priv, const void ns);
2063d608 TH	215	struct kernfs_node __kernfs_create_file(struct kernfs_node parent,
	216	const char *name,
	217	umode_t mode, loff_t size,
	218	const struct kernfs_ops *ops,
	219	void priv, const void ns,
	220	bool name_is_static,
	221	struct lock_class_key *key);
324a56e1 TH	222	struct kernfs_node kernfs_create_link(struct kernfs_node parent,
	223	const char *name,
	224	struct kernfs_node *target);
	225	void kernfs_remove(struct kernfs_node *kn);
	226	int kernfs_remove_by_name_ns(struct kernfs_node parent, const char name,
879f40d1	227	const void *ns);
324a56e1	228	int kernfs_rename_ns(struct kernfs_node kn, struct kernfs_node new_parent,
890ece16	229	const char new_name, const void new_ns);
324a56e1 TH	230	int kernfs_setattr(struct kernfs_node kn, const struct iattr iattr);
324a56e1 TH	231	void kernfs_notify(struct kernfs_node *kn);
879f40d1	232
4b93dc9b TH	233	const void kernfs_super_ns(struct super_block sb);
	234	struct dentry kernfs_mount_ns(struct file_system_type fs_type, int flags,
	235	struct kernfs_root root, const void ns);
	236	void kernfs_kill_sb(struct super_block *sb);
	237
	238	void kernfs_init(void);
	239
879f40d1 TH	240	#else /* CONFIG_SYSFS */
879f40d1 TH	241
df23fc39	242	static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)
cf9e5a73 TH	243	{ return 0; } /* whatever */
cf9e5a73 TH	244
324a56e1	245	static inline void kernfs_enable_ns(struct kernfs_node *kn) { }
cf9e5a73	246
324a56e1	247	static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
ac9bba03 TH	248	{ return false; }
ac9bba03 TH	249
324a56e1 TH	250	static inline struct kernfs_node *
324a56e1 TH	251	kernfs_find_and_get_ns(struct kernfs_node parent, const char name,
ccf73cf3 TH	252	const void *ns)
	253	{ return NULL; }
	254
324a56e1 TH	255	static inline void kernfs_get(struct kernfs_node *kn) { }
324a56e1 TH	256	static inline void kernfs_put(struct kernfs_node *kn) { }
ccf73cf3	257
ba7443bc TH	258	static inline struct kernfs_root kernfs_create_root(void priv)
	259	{ return ERR_PTR(-ENOSYS); }
	260
	261	static inline void kernfs_destroy_root(struct kernfs_root *root) { }
	262
324a56e1	263	static inline struct kernfs_node *
bb8b9d09 TH	264	kernfs_create_dir_ns(struct kernfs_node parent, const char name,
bb8b9d09 TH	265	umode_t mode, void priv, const void ns)
93b2b8e4 TH	266	{ return ERR_PTR(-ENOSYS); }
93b2b8e4 TH	267
324a56e1	268	static inline struct kernfs_node *
2063d608 TH	269	__kernfs_create_file(struct kernfs_node parent, const char name,
	270	umode_t mode, loff_t size, const struct kernfs_ops *ops,
	271	void priv, const void ns, bool name_is_static,
	272	struct lock_class_key *key)
496f7394 TH	273	{ return ERR_PTR(-ENOSYS); }
496f7394 TH	274
324a56e1 TH	275	static inline struct kernfs_node *
	276	kernfs_create_link(struct kernfs_node parent, const char name,
	277	struct kernfs_node *target)
5d0e26bb TH	278	{ return ERR_PTR(-ENOSYS); }
5d0e26bb TH	279
324a56e1	280	static inline void kernfs_remove(struct kernfs_node *kn) { }
879f40d1	281
324a56e1	282	static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn,
879f40d1 TH	283	const char name, const void ns)
	284	{ return -ENOSYS; }
	285
324a56e1 TH	286	static inline int kernfs_rename_ns(struct kernfs_node *kn,
324a56e1 TH	287	struct kernfs_node *new_parent,
890ece16 TH	288	const char new_name, const void new_ns)
	289	{ return -ENOSYS; }
	290
324a56e1	291	static inline int kernfs_setattr(struct kernfs_node *kn,
5d60418e TH	292	const struct iattr *iattr)
	293	{ return -ENOSYS; }
	294
324a56e1	295	static inline void kernfs_notify(struct kernfs_node *kn) { }
024f6471	296
4b93dc9b TH	297	static inline const void kernfs_super_ns(struct super_block sb)
	298	{ return NULL; }
	299
	300	static inline struct dentry *
	301	kernfs_mount_ns(struct file_system_type *fs_type, int flags,
	302	struct kernfs_root root, const void ns)
	303	{ return ERR_PTR(-ENOSYS); }
	304
	305	static inline void kernfs_kill_sb(struct super_block *sb) { }
	306
	307	static inline void kernfs_init(void) { }
	308
879f40d1 TH	309	#endif /* CONFIG_SYSFS */
879f40d1 TH	310
324a56e1 TH	311	static inline struct kernfs_node *
324a56e1 TH	312	kernfs_find_and_get(struct kernfs_node kn, const char name)
ccf73cf3	313	{
324a56e1	314	return kernfs_find_and_get_ns(kn, name, NULL);
ccf73cf3 TH	315	}
ccf73cf3 TH	316
324a56e1	317	static inline struct kernfs_node *
bb8b9d09 TH	318	kernfs_create_dir(struct kernfs_node parent, const char name, umode_t mode,
bb8b9d09 TH	319	void *priv)
93b2b8e4	320	{
bb8b9d09	321	return kernfs_create_dir_ns(parent, name, mode, priv, NULL);
93b2b8e4 TH	322	}
93b2b8e4 TH	323
324a56e1 TH	324	static inline struct kernfs_node *
324a56e1 TH	325	kernfs_create_file_ns(struct kernfs_node parent, const char name,
517e64f5 TH	326	umode_t mode, loff_t size, const struct kernfs_ops *ops,
	327	void priv, const void ns)
	328	{
	329	struct lock_class_key *key = NULL;
	330
	331	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	332	key = (struct lock_class_key *)&ops->lockdep_key;
	333	#endif
2063d608 TH	334	return __kernfs_create_file(parent, name, mode, size, ops, priv, ns,
2063d608 TH	335	false, key);
517e64f5 TH	336	}
517e64f5 TH	337
324a56e1 TH	338	static inline struct kernfs_node *
324a56e1 TH	339	kernfs_create_file(struct kernfs_node parent, const char name, umode_t mode,
496f7394 TH	340	loff_t size, const struct kernfs_ops ops, void priv)
	341	{
	342	return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL);
	343	}
	344
324a56e1	345	static inline int kernfs_remove_by_name(struct kernfs_node *parent,
879f40d1 TH	346	const char *name)
	347	{
	348	return kernfs_remove_by_name_ns(parent, name, NULL);
	349	}
	350
4b93dc9b TH	351	static inline struct dentry *
	352	kernfs_mount(struct file_system_type *fs_type, int flags,
	353	struct kernfs_root *root)
	354	{
	355	return kernfs_mount_ns(fs_type, flags, root, NULL);
	356	}
	357
b8441ed2	358	#endif /* __LINUX_KERNFS_H */