[linux-block.git] / include / linux / proc_fs.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * The proc filesystem constants/structures
 */
#ifndef _LINUX_PROC_FS_H
#define _LINUX_PROC_FS_H

#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/fs.h>

struct proc_dir_entry;
struct seq_file;
struct seq_operations;

enum {
	/*
	 * All /proc entries using this ->proc_ops instance are never removed.
	 *
	 * If in doubt, ignore this flag.
	 */
#ifdef MODULE
	PROC_ENTRY_PERMANENT = 0U,
#else
	PROC_ENTRY_PERMANENT = 1U << 0,
#endif
};

struct proc_ops {
	unsigned int proc_flags;
	int	(*proc_open)(struct inode *, struct file *);
	ssize_t	(*proc_read)(struct file *, char __user *, size_t, loff_t *);
	ssize_t (*proc_read_iter)(struct kiocb *, struct iov_iter *);
	ssize_t	(*proc_write)(struct file *, const char __user *, size_t, loff_t *);
	/* mandatory unless nonseekable_open() or equivalent is used */
	loff_t	(*proc_lseek)(struct file *, loff_t, int);
	int	(*proc_release)(struct inode *, struct file *);
	__poll_t (*proc_poll)(struct file *, struct poll_table_struct *);
	long	(*proc_ioctl)(struct file *, unsigned int, unsigned long);
#ifdef CONFIG_COMPAT
	long	(*proc_compat_ioctl)(struct file *, unsigned int, unsigned long);
#endif
	int	(*proc_mmap)(struct file *, struct vm_area_struct *);
	unsigned long (*proc_get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
} __randomize_layout;

/* definitions for hide_pid field */
enum proc_hidepid {
	HIDEPID_OFF	  = 0,
	HIDEPID_NO_ACCESS = 1,
	HIDEPID_INVISIBLE = 2,
	HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
};

/* definitions for proc mount option pidonly */
enum proc_pidonly {
	PROC_PIDONLY_OFF = 0,
	PROC_PIDONLY_ON  = 1,
};

struct proc_fs_info {
	struct pid_namespace *pid_ns;
	struct dentry *proc_self;        /* For /proc/self */
	struct dentry *proc_thread_self; /* For /proc/thread-self */
	kgid_t pid_gid;
	enum proc_hidepid hide_pid;
	enum proc_pidonly pidonly;
};

static inline struct proc_fs_info *proc_sb_info(struct super_block *sb)
{
	return sb->s_fs_info;
}

#ifdef CONFIG_PROC_FS

typedef int (*proc_write_t)(struct file *, char *, size_t);

extern void proc_root_init(void);
extern void proc_flush_pid(struct pid *);

extern struct proc_dir_entry *proc_symlink(const char *,
		struct proc_dir_entry *, const char *);
struct proc_dir_entry *_proc_mkdir(const char *, umode_t, struct proc_dir_entry *, void *, bool);
extern struct proc_dir_entry *proc_mkdir(const char *, struct proc_dir_entry *);
extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
					      struct proc_dir_entry *, void *);
extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
					      struct proc_dir_entry *);
struct proc_dir_entry *proc_create_mount_point(const char *name);

struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
		struct proc_dir_entry *parent, const struct seq_operations *ops,
		unsigned int state_size, void *data);
#define proc_create_seq_data(name, mode, parent, ops, data) \
	proc_create_seq_private(name, mode, parent, ops, 0, data)
#define proc_create_seq(name, mode, parent, ops) \
	proc_create_seq_private(name, mode, parent, ops, 0, NULL)
struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode,
		struct proc_dir_entry *parent,
		int (*show)(struct seq_file *, void *), void *data);
#define proc_create_single(name, mode, parent, show) \
	proc_create_single_data(name, mode, parent, show, NULL)
 
extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
					       struct proc_dir_entry *,
					       const struct proc_ops *,
					       void *);

struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
extern void proc_set_size(struct proc_dir_entry *, loff_t);
extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
extern void *PDE_DATA(const struct inode *);
extern void *proc_get_parent_data(const struct inode *);
extern void proc_remove(struct proc_dir_entry *);
extern void remove_proc_entry(const char *, struct proc_dir_entry *);
extern int remove_proc_subtree(const char *, struct proc_dir_entry *);

struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
		struct proc_dir_entry *parent, const struct seq_operations *ops,
		unsigned int state_size, void *data);
#define proc_create_net(name, mode, parent, ops, state_size) \
	proc_create_net_data(name, mode, parent, ops, state_size, NULL)
struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
		struct proc_dir_entry *parent,
		int (*show)(struct seq_file *, void *), void *data);
struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
						  struct proc_dir_entry *parent,
						  const struct seq_operations *ops,
						  proc_write_t write,
						  unsigned int state_size, void *data);
struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
						    struct proc_dir_entry *parent,
						    int (*show)(struct seq_file *, void *),
						    proc_write_t write,
						    void *data);
extern struct pid *tgid_pidfd_to_pid(const struct file *file);

struct bpf_iter_aux_info;
extern int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux);
extern void bpf_iter_fini_seq_net(void *priv_data);

#ifdef CONFIG_PROC_PID_ARCH_STATUS
/*
 * The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
 * provide proc_pid_arch_status() definition.
 */
int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns,
			struct pid *pid, struct task_struct *task);
#endif /* CONFIG_PROC_PID_ARCH_STATUS */

#else /* CONFIG_PROC_FS */

static inline void proc_root_init(void)
{
}

static inline void proc_flush_pid(struct pid *pid)
{
}

static inline struct proc_dir_entry *proc_symlink(const char *name,
		struct proc_dir_entry *parent,const char *dest) { return NULL;}
static inline struct proc_dir_entry *proc_mkdir(const char *name,
	struct proc_dir_entry *parent) {return NULL;}
static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
static inline struct proc_dir_entry *_proc_mkdir(const char *name, umode_t mode,
		struct proc_dir_entry *parent, void *data, bool force_lookup)
{
	return NULL;
}
static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
	umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
	umode_t mode, struct proc_dir_entry *parent) { return NULL; }
#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
#define proc_create_seq(name, mode, parent, ops) ({NULL;})
#define proc_create_single(name, mode, parent, show) ({NULL;})
#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})

static inline struct proc_dir_entry *
proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent,
	    const struct proc_ops *proc_ops)
{ return NULL; }

static inline struct proc_dir_entry *
proc_create_data(const char *name, umode_t mode, struct proc_dir_entry *parent,
		 const struct proc_ops *proc_ops, void *data)
{ return NULL; }

static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
static inline void *proc_get_parent_data(const struct inode *inode) { BUG(); return NULL; }

static inline void proc_remove(struct proc_dir_entry *de) {}
#define remove_proc_entry(name, parent) do {} while (0)
static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) { return 0; }

#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})

static inline struct pid *tgid_pidfd_to_pid(const struct file *file)
{
	return ERR_PTR(-EBADF);
}

#endif /* CONFIG_PROC_FS */

struct net;

static inline struct proc_dir_entry *proc_net_mkdir(
	struct net *net, const char *name, struct proc_dir_entry *parent)
{
	return _proc_mkdir(name, 0, parent, net, true);
}

struct ns_common;
int open_related_ns(struct ns_common *ns,
		   struct ns_common *(*get_ns)(struct ns_common *ns));

/* get the associated pid namespace for a file in procfs */
static inline struct pid_namespace *proc_pid_ns(struct super_block *sb)
{
	return proc_sb_info(sb)->pid_ns;
}

bool proc_ns_file(const struct file *file);

#endif /* _LINUX_PROC_FS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* The proc filesystem constants/structures
	4	*/
59d8053f DH	5	#ifndef _LINUX_PROC_FS_H
59d8053f DH	6	#define _LINUX_PROC_FS_H
1da177e4	7
d919b33d	8	#include <linux/compiler.h>
59d8053f DH	9	#include <linux/types.h>
59d8053f DH	10	#include <linux/fs.h>
1da177e4	11
59d8053f	12	struct proc_dir_entry;
3f3942ac	13	struct seq_file;
fddda2b7	14	struct seq_operations;
1da177e4	15
d919b33d AD	16	enum {
	17	/*
	18	* All /proc entries using this ->proc_ops instance are never removed.
	19	*
	20	* If in doubt, ignore this flag.
	21	*/
	22	#ifdef MODULE
	23	PROC_ENTRY_PERMANENT = 0U,
	24	#else
	25	PROC_ENTRY_PERMANENT = 1U << 0,
	26	#endif
	27	};
	28
d56c0d45	29	struct proc_ops {
d919b33d	30	unsigned int proc_flags;
d56c0d45 AD	31	int (proc_open)(struct inode , struct file *);
d56c0d45 AD	32	ssize_t (proc_read)(struct file , char __user , size_t, loff_t );
fd5a13f4	33	ssize_t (proc_read_iter)(struct kiocb , struct iov_iter *);
d56c0d45	34	ssize_t (proc_write)(struct file , const char __user , size_t, loff_t );
d4455fac	35	/* mandatory unless nonseekable_open() or equivalent is used */
d56c0d45 AD	36	loff_t (proc_lseek)(struct file , loff_t, int);
	37	int (proc_release)(struct inode , struct file *);
	38	__poll_t (proc_poll)(struct file , struct poll_table_struct *);
	39	long (proc_ioctl)(struct file , unsigned int, unsigned long);
	40	#ifdef CONFIG_COMPAT
	41	long (proc_compat_ioctl)(struct file , unsigned int, unsigned long);
	42	#endif
	43	int (proc_mmap)(struct file , struct vm_area_struct *);
	44	unsigned long (proc_get_unmapped_area)(struct file , unsigned long, unsigned long, unsigned long, unsigned long);
d919b33d	45	} __randomize_layout;
d56c0d45	46
fa10fed3	47	/* definitions for hide_pid field */
e61bb8b3	48	enum proc_hidepid {
fa10fed3 AG	49	HIDEPID_OFF = 0,
	50	HIDEPID_NO_ACCESS = 1,
	51	HIDEPID_INVISIBLE = 2,
24a71ce5	52	HIDEPID_NOT_PTRACEABLE = 4, /* Limit pids to only ptraceable pids */
fa10fed3 AG	53	};
fa10fed3 AG	54
6814ef2d	55	/* definitions for proc mount option pidonly */
e61bb8b3	56	enum proc_pidonly {
6814ef2d AG	57	PROC_PIDONLY_OFF = 0,
	58	PROC_PIDONLY_ON = 1,
	59	};
	60
fa10fed3 AG	61	struct proc_fs_info {
	62	struct pid_namespace *pid_ns;
	63	struct dentry proc_self; / For /proc/self */
	64	struct dentry proc_thread_self; / For /proc/thread-self */
	65	kgid_t pid_gid;
e61bb8b3 AG	66	enum proc_hidepid hide_pid;
e61bb8b3 AG	67	enum proc_pidonly pidonly;
fa10fed3 AG	68	};
	69
	70	static inline struct proc_fs_info proc_sb_info(struct super_block sb)
	71	{
	72	return sb->s_fs_info;
	73	}
	74
1da177e4 LT	75	#ifdef CONFIG_PROC_FS
1da177e4 LT	76
564def71 DH	77	typedef int (proc_write_t)(struct file , char *, size_t);
564def71 DH	78
1da177e4	79	extern void proc_root_init(void);
7bc3e6e5	80	extern void proc_flush_pid(struct pid *);
1da177e4	81
1da177e4 LT	82	extern struct proc_dir_entry proc_symlink(const char ,
1da177e4 LT	83	struct proc_dir_entry , const char );
c6c75ded	84	struct proc_dir_entry _proc_mkdir(const char , umode_t, struct proc_dir_entry , void , bool);
59d8053f	85	extern struct proc_dir_entry proc_mkdir(const char , struct proc_dir_entry *);
270b5ac2 DH	86	extern struct proc_dir_entry proc_mkdir_data(const char , umode_t,
270b5ac2 DH	87	struct proc_dir_entry , void );
59d8053f DH	88	extern struct proc_dir_entry proc_mkdir_mode(const char , umode_t,
59d8053f DH	89	struct proc_dir_entry *);
f97df70b	90	struct proc_dir_entry proc_create_mount_point(const char name);
fddda2b7	91
44414d82	92	struct proc_dir_entry proc_create_seq_private(const char name, umode_t mode,
fddda2b7	93	struct proc_dir_entry parent, const struct seq_operations ops,
44414d82 CH	94	unsigned int state_size, void *data);
	95	#define proc_create_seq_data(name, mode, parent, ops, data) \
	96	proc_create_seq_private(name, mode, parent, ops, 0, data)
fddda2b7	97	#define proc_create_seq(name, mode, parent, ops) \
44414d82	98	proc_create_seq_private(name, mode, parent, ops, 0, NULL)
3f3942ac CH	99	struct proc_dir_entry proc_create_single_data(const char name, umode_t mode,
	100	struct proc_dir_entry *parent,
	101	int (show)(struct seq_file , void ), void data);
	102	#define proc_create_single(name, mode, parent, show) \
	103	proc_create_single_data(name, mode, parent, show, NULL)
59d8053f DH	104
	105	extern struct proc_dir_entry proc_create_data(const char , umode_t,
	106	struct proc_dir_entry *,
d56c0d45	107	const struct proc_ops *,
59d8053f DH	108	void *);
59d8053f DH	109
d56c0d45	110	struct proc_dir_entry proc_create(const char name, umode_t mode, struct proc_dir_entry parent, const struct proc_ops proc_ops);
271a15ea DH	111	extern void proc_set_size(struct proc_dir_entry *, loff_t);
271a15ea DH	112	extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
c30480b9	113	extern void PDE_DATA(const struct inode );
4a520d27	114	extern void proc_get_parent_data(const struct inode );
59d8053f DH	115	extern void proc_remove(struct proc_dir_entry *);
	116	extern void remove_proc_entry(const char , struct proc_dir_entry );
	117	extern int remove_proc_subtree(const char , struct proc_dir_entry );
	118
c3506372 CH	119	struct proc_dir_entry proc_create_net_data(const char name, umode_t mode,
	120	struct proc_dir_entry parent, const struct seq_operations ops,
	121	unsigned int state_size, void *data);
9573e8f7 ML	122	#define proc_create_net(name, mode, parent, ops, state_size) \
9573e8f7 ML	123	proc_create_net_data(name, mode, parent, ops, state_size, NULL)
3617d949 CH	124	struct proc_dir_entry proc_create_net_single(const char name, umode_t mode,
	125	struct proc_dir_entry *parent,
	126	int (show)(struct seq_file , void ), void data);
564def71 DH	127	struct proc_dir_entry proc_create_net_data_write(const char name, umode_t mode,
	128	struct proc_dir_entry *parent,
	129	const struct seq_operations *ops,
	130	proc_write_t write,
	131	unsigned int state_size, void *data);
	132	struct proc_dir_entry proc_create_net_single_write(const char name, umode_t mode,
	133	struct proc_dir_entry *parent,
	134	int (show)(struct seq_file , void *),
	135	proc_write_t write,
	136	void *data);
3eb39f47	137	extern struct pid tgid_pidfd_to_pid(const struct file file);
c3506372	138
f9c79272 YS	139	struct bpf_iter_aux_info;
f9c79272 YS	140	extern int bpf_iter_init_seq_net(void priv_data, struct bpf_iter_aux_info aux);
138d0be3 YS	141	extern void bpf_iter_fini_seq_net(void *priv_data);
138d0be3 YS	142
68bc30bb AL	143	#ifdef CONFIG_PROC_PID_ARCH_STATUS
	144	/*
	145	* The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
	146	* provide proc_pid_arch_status() definition.
	147	*/
	148	int proc_pid_arch_status(struct seq_file m, struct pid_namespace ns,
	149	struct pid pid, struct task_struct task);
	150	#endif /* CONFIG_PROC_PID_ARCH_STATUS */
	151
59d8053f	152	#else /* CONFIG_PROC_FS */
1da177e4	153
647f010b AM	154	static inline void proc_root_init(void)
	155	{
	156	}
	157
7bc3e6e5	158	static inline void proc_flush_pid(struct pid *pid)
60347f67 PE	159	{
60347f67 PE	160	}
1da177e4	161
1da177e4	162	static inline struct proc_dir_entry proc_symlink(const char name,
59d8053f	163	struct proc_dir_entry parent,const char dest) { return NULL;}
1da177e4 LT	164	static inline struct proc_dir_entry proc_mkdir(const char name,
1da177e4 LT	165	struct proc_dir_entry *parent) {return NULL;}
f97df70b	166	static inline struct proc_dir_entry proc_create_mount_point(const char name) { return NULL; }
c6c75ded AD	167	static inline struct proc_dir_entry _proc_mkdir(const char name, umode_t mode,
	168	struct proc_dir_entry parent, void data, bool force_lookup)
	169	{
	170	return NULL;
	171	}
270b5ac2 DH	172	static inline struct proc_dir_entry proc_mkdir_data(const char name,
270b5ac2 DH	173	umode_t mode, struct proc_dir_entry parent, void data) { return NULL; }
f12a20fc	174	static inline struct proc_dir_entry proc_mkdir_mode(const char name,
d161a13f	175	umode_t mode, struct proc_dir_entry *parent) { return NULL; }
3f3942ac	176	#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
fddda2b7 CH	177	#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
fddda2b7 CH	178	#define proc_create_seq(name, mode, parent, ops) ({NULL;})
3f3942ac CH	179	#define proc_create_single(name, mode, parent, show) ({NULL;})
3f3942ac CH	180	#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
ae62fbe2 HG	181
	182	static inline struct proc_dir_entry *
	183	proc_create(const char name, umode_t mode, struct proc_dir_entry parent,
	184	const struct proc_ops *proc_ops)
	185	{ return NULL; }
	186
	187	static inline struct proc_dir_entry *
	188	proc_create_data(const char name, umode_t mode, struct proc_dir_entry parent,
	189	const struct proc_ops proc_ops, void data)
	190	{ return NULL; }
59d8053f	191
271a15ea DH	192	static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
271a15ea DH	193	static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
c30480b9	194	static inline void PDE_DATA(const struct inode inode) {BUG(); return NULL;}
59d8053f	195	static inline void proc_get_parent_data(const struct inode inode) { BUG(); return NULL; }
1da177e4	196
59d8053f DH	197	static inline void proc_remove(struct proc_dir_entry *de) {}
	198	#define remove_proc_entry(name, parent) do {} while (0)
	199	static inline int remove_proc_subtree(const char name, struct proc_dir_entry parent) { return 0; }
9043476f	200
c3506372 CH	201	#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
c3506372 CH	202	#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
3617d949	203	#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
c3506372	204
3eb39f47 CB	205	static inline struct pid tgid_pidfd_to_pid(const struct file file)
	206	{
	207	return ERR_PTR(-EBADF);
	208	}
	209
59d8053f	210	#endif /* CONFIG_PROC_FS */
1da177e4	211
f7790029 JL	212	struct net;
f7790029 JL	213
270b5ac2 DH	214	static inline struct proc_dir_entry *proc_net_mkdir(
	215	struct net net, const char name, struct proc_dir_entry *parent)
	216	{
c6c75ded	217	return _proc_mkdir(name, 0, parent, net, true);
270b5ac2 DH	218	}
270b5ac2 DH	219
c62cce2c AV	220	struct ns_common;
	221	int open_related_ns(struct ns_common *ns,
	222	struct ns_common (get_ns)(struct ns_common *ns));
	223
76f668be	224	/* get the associated pid namespace for a file in procfs */
9d78edea	225	static inline struct pid_namespace proc_pid_ns(struct super_block sb)
76f668be	226	{
9d78edea	227	return proc_sb_info(sb)->pid_ns;
76f668be CH	228	}
76f668be CH	229
303cc571 CB	230	bool proc_ns_file(const struct file *file);
303cc571 CB	231
1da177e4	232	#endif /* _LINUX_PROC_FS_H */