xref: /linux/fs/proc/internal.h (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /* internal.h: internal procfs definitions
2  *
3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 
12 #include <linux/proc_fs.h>
13 struct  ctl_table_header;
14 
15 extern struct proc_dir_entry proc_root;
16 #ifdef CONFIG_PROC_SYSCTL
17 extern int proc_sys_init(void);
18 extern void sysctl_head_put(struct ctl_table_header *head);
19 #else
20 static inline void proc_sys_init(void) { }
21 static inline void sysctl_head_put(struct ctl_table_header *head) { }
22 #endif
23 #ifdef CONFIG_NET
24 extern int proc_net_init(void);
25 #else
26 static inline int proc_net_init(void) { return 0; }
27 #endif
28 
29 struct vmalloc_info {
30 	unsigned long	used;
31 	unsigned long	largest_chunk;
32 };
33 
34 #ifdef CONFIG_MMU
35 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
36 extern void get_vmalloc_info(struct vmalloc_info *vmi);
37 #else
38 
39 #define VMALLOC_TOTAL 0UL
40 #define get_vmalloc_info(vmi)			\
41 do {						\
42 	(vmi)->used = 0;			\
43 	(vmi)->largest_chunk = 0;		\
44 } while(0)
45 #endif
46 
47 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
48 				struct pid *pid, struct task_struct *task);
49 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
50 				struct pid *pid, struct task_struct *task);
51 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
52 				struct pid *pid, struct task_struct *task);
53 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
54 				struct pid *pid, struct task_struct *task);
55 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
56 
57 extern const struct file_operations proc_tid_children_operations;
58 extern const struct file_operations proc_pid_maps_operations;
59 extern const struct file_operations proc_tid_maps_operations;
60 extern const struct file_operations proc_pid_numa_maps_operations;
61 extern const struct file_operations proc_tid_numa_maps_operations;
62 extern const struct file_operations proc_pid_smaps_operations;
63 extern const struct file_operations proc_tid_smaps_operations;
64 extern const struct file_operations proc_clear_refs_operations;
65 extern const struct file_operations proc_pagemap_operations;
66 extern const struct file_operations proc_net_operations;
67 extern const struct inode_operations proc_net_inode_operations;
68 
69 struct proc_maps_private {
70 	struct pid *pid;
71 	struct task_struct *task;
72 #ifdef CONFIG_MMU
73 	struct vm_area_struct *tail_vma;
74 #endif
75 };
76 
77 void proc_init_inodecache(void);
78 
79 static inline struct pid *proc_pid(struct inode *inode)
80 {
81 	return PROC_I(inode)->pid;
82 }
83 
84 static inline struct task_struct *get_proc_task(struct inode *inode)
85 {
86 	return get_pid_task(proc_pid(inode), PIDTYPE_PID);
87 }
88 
89 static inline int proc_fd(struct inode *inode)
90 {
91 	return PROC_I(inode)->fd;
92 }
93 
94 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
95 		struct dentry *dentry);
96 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
97 		filldir_t filldir);
98 
99 struct pde_opener {
100 	struct inode *inode;
101 	struct file *file;
102 	int (*release)(struct inode *, struct file *);
103 	struct list_head lh;
104 };
105 void pde_users_dec(struct proc_dir_entry *pde);
106 
107 extern spinlock_t proc_subdir_lock;
108 
109 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
110 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
111 unsigned long task_vsize(struct mm_struct *);
112 unsigned long task_statm(struct mm_struct *,
113 	unsigned long *, unsigned long *, unsigned long *, unsigned long *);
114 void task_mem(struct seq_file *, struct mm_struct *);
115 
116 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
117 {
118 	atomic_inc(&pde->count);
119 	return pde;
120 }
121 void pde_put(struct proc_dir_entry *pde);
122 
123 int proc_fill_super(struct super_block *);
124 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
125 int proc_remount(struct super_block *sb, int *flags, char *data);
126 
127 /*
128  * These are generic /proc routines that use the internal
129  * "struct proc_dir_entry" tree to traverse the filesystem.
130  *
131  * The /proc root directory has extended versions to take care
132  * of the /proc/<pid> subdirectories.
133  */
134 int proc_readdir(struct file *, void *, filldir_t);
135 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
136 
137 
138 
139 /* Lookups */
140 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
141 				struct task_struct *, const void *);
142 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
143 	const char *name, int len,
144 	instantiate_t instantiate, struct task_struct *task, const void *ptr);
145 int pid_revalidate(struct dentry *dentry, unsigned int flags);
146 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
147 extern const struct dentry_operations pid_dentry_operations;
148 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
149 int proc_setattr(struct dentry *dentry, struct iattr *attr);
150 
151 extern const struct inode_operations proc_ns_dir_inode_operations;
152 extern const struct file_operations proc_ns_dir_operations;
153 
154