xref: /linux/fs/proc/internal.h (revision 53279f36dccffc26ff536003fd6bb97cc21c3b82)
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/sched.h>
13 #include <linux/proc_fs.h>
14 struct  ctl_table_header;
15 struct  mempolicy;
16 
17 extern struct proc_dir_entry proc_root;
18 #ifdef CONFIG_PROC_SYSCTL
19 extern int proc_sys_init(void);
20 extern void sysctl_head_put(struct ctl_table_header *head);
21 #else
22 static inline void proc_sys_init(void) { }
23 static inline void sysctl_head_put(struct ctl_table_header *head) { }
24 #endif
25 #ifdef CONFIG_NET
26 extern int proc_net_init(void);
27 #else
28 static inline int proc_net_init(void) { return 0; }
29 #endif
30 
31 struct vmalloc_info {
32 	unsigned long	used;
33 	unsigned long	largest_chunk;
34 };
35 
36 #ifdef CONFIG_MMU
37 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
38 extern void get_vmalloc_info(struct vmalloc_info *vmi);
39 #else
40 
41 #define VMALLOC_TOTAL 0UL
42 #define get_vmalloc_info(vmi)			\
43 do {						\
44 	(vmi)->used = 0;			\
45 	(vmi)->largest_chunk = 0;		\
46 } while(0)
47 #endif
48 
49 extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
50 				struct pid *pid, struct task_struct *task);
51 extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
52 				struct pid *pid, struct task_struct *task);
53 extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
54 				struct pid *pid, struct task_struct *task);
55 extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
56 				struct pid *pid, struct task_struct *task);
57 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
58 
59 extern const struct file_operations proc_tid_children_operations;
60 extern const struct file_operations proc_pid_maps_operations;
61 extern const struct file_operations proc_tid_maps_operations;
62 extern const struct file_operations proc_pid_numa_maps_operations;
63 extern const struct file_operations proc_tid_numa_maps_operations;
64 extern const struct file_operations proc_pid_smaps_operations;
65 extern const struct file_operations proc_tid_smaps_operations;
66 extern const struct file_operations proc_clear_refs_operations;
67 extern const struct file_operations proc_pagemap_operations;
68 extern const struct file_operations proc_net_operations;
69 extern const struct inode_operations proc_net_inode_operations;
70 extern const struct inode_operations proc_pid_link_inode_operations;
71 
72 struct proc_maps_private {
73 	struct pid *pid;
74 	struct task_struct *task;
75 #ifdef CONFIG_MMU
76 	struct vm_area_struct *tail_vma;
77 #endif
78 #ifdef CONFIG_NUMA
79 	struct mempolicy *task_mempolicy;
80 #endif
81 };
82 
83 void proc_init_inodecache(void);
84 
85 static inline struct pid *proc_pid(struct inode *inode)
86 {
87 	return PROC_I(inode)->pid;
88 }
89 
90 static inline struct task_struct *get_proc_task(struct inode *inode)
91 {
92 	return get_pid_task(proc_pid(inode), PIDTYPE_PID);
93 }
94 
95 static inline int proc_fd(struct inode *inode)
96 {
97 	return PROC_I(inode)->fd;
98 }
99 
100 static inline int task_dumpable(struct task_struct *task)
101 {
102 	int dumpable = 0;
103 	struct mm_struct *mm;
104 
105 	task_lock(task);
106 	mm = task->mm;
107 	if (mm)
108 		dumpable = get_dumpable(mm);
109 	task_unlock(task);
110 	if (dumpable == SUID_DUMPABLE_ENABLED)
111 		return 1;
112 	return 0;
113 }
114 
115 static inline int pid_delete_dentry(const struct dentry * dentry)
116 {
117 	/* Is the task we represent dead?
118 	 * If so, then don't put the dentry on the lru list,
119 	 * kill it immediately.
120 	 */
121 	return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
122 }
123 
124 static inline unsigned name_to_int(struct dentry *dentry)
125 {
126 	const char *name = dentry->d_name.name;
127 	int len = dentry->d_name.len;
128 	unsigned n = 0;
129 
130 	if (len > 1 && *name == '0')
131 		goto out;
132 	while (len-- > 0) {
133 		unsigned c = *name++ - '0';
134 		if (c > 9)
135 			goto out;
136 		if (n >= (~0U-9)/10)
137 			goto out;
138 		n *= 10;
139 		n += c;
140 	}
141 	return n;
142 out:
143 	return ~0U;
144 }
145 
146 struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
147 		struct dentry *dentry);
148 int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
149 		filldir_t filldir);
150 
151 struct pde_opener {
152 	struct inode *inode;
153 	struct file *file;
154 	int (*release)(struct inode *, struct file *);
155 	struct list_head lh;
156 };
157 void pde_users_dec(struct proc_dir_entry *pde);
158 
159 extern spinlock_t proc_subdir_lock;
160 
161 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
162 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
163 unsigned long task_vsize(struct mm_struct *);
164 unsigned long task_statm(struct mm_struct *,
165 	unsigned long *, unsigned long *, unsigned long *, unsigned long *);
166 void task_mem(struct seq_file *, struct mm_struct *);
167 
168 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
169 {
170 	atomic_inc(&pde->count);
171 	return pde;
172 }
173 void pde_put(struct proc_dir_entry *pde);
174 
175 int proc_fill_super(struct super_block *);
176 struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
177 int proc_remount(struct super_block *sb, int *flags, char *data);
178 
179 /*
180  * These are generic /proc routines that use the internal
181  * "struct proc_dir_entry" tree to traverse the filesystem.
182  *
183  * The /proc root directory has extended versions to take care
184  * of the /proc/<pid> subdirectories.
185  */
186 int proc_readdir(struct file *, void *, filldir_t);
187 struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
188 
189 
190 
191 /* Lookups */
192 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
193 				struct task_struct *, const void *);
194 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
195 	const char *name, int len,
196 	instantiate_t instantiate, struct task_struct *task, const void *ptr);
197 int pid_revalidate(struct dentry *dentry, unsigned int flags);
198 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
199 extern const struct dentry_operations pid_dentry_operations;
200 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
201 int proc_setattr(struct dentry *dentry, struct iattr *attr);
202 
203 extern const struct inode_operations proc_ns_dir_inode_operations;
204 extern const struct file_operations proc_ns_dir_operations;
205 
206