[mirror_ubuntu-jammy-kernel.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_write)(struct file *, const char __user *, size_t, loff_t *);
	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 {
	HIDEPID_OFF	  = 0,
	HIDEPID_NO_ACCESS = 1,
	HIDEPID_INVISIBLE = 2,
};

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;
	int hide_pid;
};

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 *);
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);

#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_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;})
#define proc_create(name, mode, parent, proc_ops) ({NULL;})
#define proc_create_data(name, mode, parent, proc_ops, data) ({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_data(name, 0, parent, net);
}

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(const struct inode *inode)
{
	return proc_sb_info(inode->i_sb)->pid_ns;
}

#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 *);
	32	ssize_t (proc_read)(struct file , char __user , size_t, loff_t );
	33	ssize_t (proc_write)(struct file , const char __user , size_t, loff_t );
	34	loff_t (proc_lseek)(struct file , loff_t, int);
	35	int (proc_release)(struct inode , struct file *);
	36	__poll_t (proc_poll)(struct file , struct poll_table_struct *);
	37	long (proc_ioctl)(struct file , unsigned int, unsigned long);
	38	#ifdef CONFIG_COMPAT
	39	long (proc_compat_ioctl)(struct file , unsigned int, unsigned long);
	40	#endif
	41	int (proc_mmap)(struct file , struct vm_area_struct *);
	42	unsigned long (proc_get_unmapped_area)(struct file , unsigned long, unsigned long, unsigned long, unsigned long);
d919b33d	43	} __randomize_layout;
d56c0d45	44
fa10fed3 AG	45	/* definitions for hide_pid field */
	46	enum {
	47	HIDEPID_OFF = 0,
	48	HIDEPID_NO_ACCESS = 1,
	49	HIDEPID_INVISIBLE = 2,
	50	};
	51
	52	struct proc_fs_info {
	53	struct pid_namespace *pid_ns;
	54	struct dentry proc_self; / For /proc/self */
	55	struct dentry proc_thread_self; / For /proc/thread-self */
	56	kgid_t pid_gid;
	57	int hide_pid;
	58	};
	59
	60	static inline struct proc_fs_info proc_sb_info(struct super_block sb)
	61	{
	62	return sb->s_fs_info;
	63	}
	64
1da177e4 LT	65	#ifdef CONFIG_PROC_FS
1da177e4 LT	66
564def71 DH	67	typedef int (proc_write_t)(struct file , char *, size_t);
564def71 DH	68
1da177e4	69	extern void proc_root_init(void);
7bc3e6e5	70	extern void proc_flush_pid(struct pid *);
1da177e4	71
1da177e4 LT	72	extern struct proc_dir_entry proc_symlink(const char ,
1da177e4 LT	73	struct proc_dir_entry , const char );
59d8053f	74	extern struct proc_dir_entry proc_mkdir(const char , struct proc_dir_entry *);
270b5ac2 DH	75	extern struct proc_dir_entry proc_mkdir_data(const char , umode_t,
270b5ac2 DH	76	struct proc_dir_entry , void );
59d8053f DH	77	extern struct proc_dir_entry proc_mkdir_mode(const char , umode_t,
59d8053f DH	78	struct proc_dir_entry *);
f97df70b	79	struct proc_dir_entry proc_create_mount_point(const char name);
fddda2b7	80
44414d82	81	struct proc_dir_entry proc_create_seq_private(const char name, umode_t mode,
fddda2b7	82	struct proc_dir_entry parent, const struct seq_operations ops,
44414d82 CH	83	unsigned int state_size, void *data);
	84	#define proc_create_seq_data(name, mode, parent, ops, data) \
	85	proc_create_seq_private(name, mode, parent, ops, 0, data)
fddda2b7	86	#define proc_create_seq(name, mode, parent, ops) \
44414d82	87	proc_create_seq_private(name, mode, parent, ops, 0, NULL)
3f3942ac CH	88	struct proc_dir_entry proc_create_single_data(const char name, umode_t mode,
	89	struct proc_dir_entry *parent,
	90	int (show)(struct seq_file , void ), void data);
	91	#define proc_create_single(name, mode, parent, show) \
	92	proc_create_single_data(name, mode, parent, show, NULL)
59d8053f DH	93
	94	extern struct proc_dir_entry proc_create_data(const char , umode_t,
	95	struct proc_dir_entry *,
d56c0d45	96	const struct proc_ops *,
59d8053f DH	97	void *);
59d8053f DH	98
d56c0d45	99	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	100	extern void proc_set_size(struct proc_dir_entry *, loff_t);
271a15ea DH	101	extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
c30480b9	102	extern void PDE_DATA(const struct inode );
4a520d27	103	extern void proc_get_parent_data(const struct inode );
59d8053f DH	104	extern void proc_remove(struct proc_dir_entry *);
	105	extern void remove_proc_entry(const char , struct proc_dir_entry );
	106	extern int remove_proc_subtree(const char , struct proc_dir_entry );
	107
c3506372 CH	108	struct proc_dir_entry proc_create_net_data(const char name, umode_t mode,
	109	struct proc_dir_entry parent, const struct seq_operations ops,
	110	unsigned int state_size, void *data);
9573e8f7 ML	111	#define proc_create_net(name, mode, parent, ops, state_size) \
9573e8f7 ML	112	proc_create_net_data(name, mode, parent, ops, state_size, NULL)
3617d949 CH	113	struct proc_dir_entry proc_create_net_single(const char name, umode_t mode,
	114	struct proc_dir_entry *parent,
	115	int (show)(struct seq_file , void ), void data);
564def71 DH	116	struct proc_dir_entry proc_create_net_data_write(const char name, umode_t mode,
	117	struct proc_dir_entry *parent,
	118	const struct seq_operations *ops,
	119	proc_write_t write,
	120	unsigned int state_size, void *data);
	121	struct proc_dir_entry proc_create_net_single_write(const char name, umode_t mode,
	122	struct proc_dir_entry *parent,
	123	int (show)(struct seq_file , void *),
	124	proc_write_t write,
	125	void *data);
3eb39f47	126	extern struct pid tgid_pidfd_to_pid(const struct file file);
c3506372	127
68bc30bb AL	128	#ifdef CONFIG_PROC_PID_ARCH_STATUS
	129	/*
	130	* The architecture which selects CONFIG_PROC_PID_ARCH_STATUS must
	131	* provide proc_pid_arch_status() definition.
	132	*/
	133	int proc_pid_arch_status(struct seq_file m, struct pid_namespace ns,
	134	struct pid pid, struct task_struct task);
	135	#endif /* CONFIG_PROC_PID_ARCH_STATUS */
	136
59d8053f	137	#else /* CONFIG_PROC_FS */
1da177e4	138
647f010b AM	139	static inline void proc_root_init(void)
	140	{
	141	}
	142
7bc3e6e5	143	static inline void proc_flush_pid(struct pid *pid)
60347f67 PE	144	{
60347f67 PE	145	}
1da177e4	146
1da177e4	147	static inline struct proc_dir_entry proc_symlink(const char name,
59d8053f	148	struct proc_dir_entry parent,const char dest) { return NULL;}
1da177e4 LT	149	static inline struct proc_dir_entry proc_mkdir(const char name,
1da177e4 LT	150	struct proc_dir_entry *parent) {return NULL;}
f97df70b	151	static inline struct proc_dir_entry proc_create_mount_point(const char name) { return NULL; }
270b5ac2 DH	152	static inline struct proc_dir_entry proc_mkdir_data(const char name,
270b5ac2 DH	153	umode_t mode, struct proc_dir_entry parent, void data) { return NULL; }
f12a20fc	154	static inline struct proc_dir_entry proc_mkdir_mode(const char name,
d161a13f	155	umode_t mode, struct proc_dir_entry *parent) { return NULL; }
3f3942ac	156	#define proc_create_seq_private(name, mode, parent, ops, size, data) ({NULL;})
fddda2b7 CH	157	#define proc_create_seq_data(name, mode, parent, ops, data) ({NULL;})
fddda2b7 CH	158	#define proc_create_seq(name, mode, parent, ops) ({NULL;})
3f3942ac CH	159	#define proc_create_single(name, mode, parent, show) ({NULL;})
3f3942ac CH	160	#define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
d56c0d45 AD	161	#define proc_create(name, mode, parent, proc_ops) ({NULL;})
d56c0d45 AD	162	#define proc_create_data(name, mode, parent, proc_ops, data) ({NULL;})
59d8053f	163
271a15ea DH	164	static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
271a15ea DH	165	static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
c30480b9	166	static inline void PDE_DATA(const struct inode inode) {BUG(); return NULL;}
59d8053f	167	static inline void proc_get_parent_data(const struct inode inode) { BUG(); return NULL; }
1da177e4	168
59d8053f DH	169	static inline void proc_remove(struct proc_dir_entry *de) {}
	170	#define remove_proc_entry(name, parent) do {} while (0)
	171	static inline int remove_proc_subtree(const char name, struct proc_dir_entry parent) { return 0; }
9043476f	172
c3506372 CH	173	#define proc_create_net_data(name, mode, parent, ops, state_size, data) ({NULL;})
c3506372 CH	174	#define proc_create_net(name, mode, parent, state_size, ops) ({NULL;})
3617d949	175	#define proc_create_net_single(name, mode, parent, show, data) ({NULL;})
c3506372	176
3eb39f47 CB	177	static inline struct pid tgid_pidfd_to_pid(const struct file file)
	178	{
	179	return ERR_PTR(-EBADF);
	180	}
	181
59d8053f	182	#endif /* CONFIG_PROC_FS */
1da177e4	183
f7790029 JL	184	struct net;
f7790029 JL	185
270b5ac2 DH	186	static inline struct proc_dir_entry *proc_net_mkdir(
	187	struct net net, const char name, struct proc_dir_entry *parent)
	188	{
	189	return proc_mkdir_data(name, 0, parent, net);
	190	}
	191
c62cce2c AV	192	struct ns_common;
	193	int open_related_ns(struct ns_common *ns,
	194	struct ns_common (get_ns)(struct ns_common *ns));
	195
76f668be	196	/* get the associated pid namespace for a file in procfs */
891ae71d	197	static inline struct pid_namespace proc_pid_ns(const struct inode inode)
76f668be	198	{
fa10fed3	199	return proc_sb_info(inode->i_sb)->pid_ns;
76f668be CH	200	}
76f668be CH	201
1da177e4	202	#endif /* _LINUX_PROC_FS_H */