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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>
14struct ctl_table_header;
15struct mempolicy;
16
17extern struct proc_dir_entry proc_root;
18#ifdef CONFIG_PROC_SYSCTL
19extern int proc_sys_init(void);
20extern void sysctl_head_put(struct ctl_table_header *head);
21#else
22static inline void proc_sys_init(void) { }
23static inline void sysctl_head_put(struct ctl_table_header *head) { }
24#endif
25#ifdef CONFIG_NET
26extern int proc_net_init(void);
27#else
28static inline int proc_net_init(void) { return 0; }
29#endif
30
31struct 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)
38extern void get_vmalloc_info(struct vmalloc_info *vmi);
39#else
40
41#define VMALLOC_TOTAL 0UL
42#define get_vmalloc_info(vmi) \
43do { \
44 (vmi)->used = 0; \
45 (vmi)->largest_chunk = 0; \
46} while(0)
47#endif
48
49extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
50 struct pid *pid, struct task_struct *task);
51extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
52 struct pid *pid, struct task_struct *task);
53extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
54 struct pid *pid, struct task_struct *task);
55extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
56 struct pid *pid, struct task_struct *task);
57extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
58
59extern const struct file_operations proc_tid_children_operations;
60extern const struct file_operations proc_pid_maps_operations;
61extern const struct file_operations proc_tid_maps_operations;
62extern const struct file_operations proc_pid_numa_maps_operations;
63extern const struct file_operations proc_tid_numa_maps_operations;
64extern const struct file_operations proc_pid_smaps_operations;
65extern const struct file_operations proc_tid_smaps_operations;
66extern const struct file_operations proc_clear_refs_operations;
67extern const struct file_operations proc_pagemap_operations;
68extern const struct file_operations proc_net_operations;
69extern const struct inode_operations proc_net_inode_operations;
70extern const struct inode_operations proc_pid_link_inode_operations;
71
72struct 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
83void proc_init_inodecache(void);
84
85static inline struct pid *proc_pid(struct inode *inode)
86{
87 return PROC_I(inode)->pid;
88}
89
90static inline struct task_struct *get_proc_task(struct inode *inode)
91{
92 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
93}
94
95static inline int proc_fd(struct inode *inode)
96{
97 return PROC_I(inode)->fd;
98}
99
100static 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
115static 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
124static 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;
142out:
143 return ~0U;
144}
145
146struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
147 struct dentry *dentry);
148int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
149 filldir_t filldir);
150
151struct pde_opener {
152 struct inode *inode;
153 struct file *file;
154 int (*release)(struct inode *, struct file *);
155 struct list_head lh;
156};
157void pde_users_dec(struct proc_dir_entry *pde);
158
159extern spinlock_t proc_subdir_lock;
160
161struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
162int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
163unsigned long task_vsize(struct mm_struct *);
164unsigned long task_statm(struct mm_struct *,
165 unsigned long *, unsigned long *, unsigned long *, unsigned long *);
166void task_mem(struct seq_file *, struct mm_struct *);
167
168static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
169{
170 atomic_inc(&pde->count);
171 return pde;
172}
173void pde_put(struct proc_dir_entry *pde);
174
175int proc_fill_super(struct super_block *);
176struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
177int 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 */
186int proc_readdir(struct file *, void *, filldir_t);
187struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
188
189
190
191/* Lookups */
192typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
193 struct task_struct *, const void *);
194int 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);
197int pid_revalidate(struct dentry *dentry, unsigned int flags);
198struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
199extern const struct dentry_operations pid_dentry_operations;
200int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
201int proc_setattr(struct dentry *dentry, struct iattr *attr);
202
203extern const struct inode_operations proc_ns_dir_inode_operations;
204extern const struct file_operations proc_ns_dir_operations;
205