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1/* 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#include <linux/proc_ns.h>
14#include <linux/spinlock.h>
15#include <linux/atomic.h>
16#include <linux/binfmts.h>
17
18struct ctl_table_header;
19struct mempolicy;
20
21/*
22 * This is not completely implemented yet. The idea is to
23 * create an in-memory tree (like the actual /proc filesystem
24 * tree) of these proc_dir_entries, so that we can dynamically
25 * add new files to /proc.
26 *
27 * The "next" pointer creates a linked list of one /proc directory,
28 * while parent/subdir create the directory structure (every
29 * /proc file has a parent, but "subdir" is NULL for all
30 * non-directory entries).
31 */
32struct proc_dir_entry {
33 unsigned int low_ino;
34 umode_t mode;
35 nlink_t nlink;
36 kuid_t uid;
37 kgid_t gid;
38 loff_t size;
39 const struct inode_operations *proc_iops;
40 const struct file_operations *proc_fops;
41 struct proc_dir_entry *next, *parent, *subdir;
42 void *data;
43 atomic_t count; /* use count */
44 atomic_t in_use; /* number of callers into module in progress; */
45 /* negative -> it's going away RSN */
46 struct completion *pde_unload_completion;
47 struct list_head pde_openers; /* who did ->open, but not ->release */
48 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
49 u8 namelen;
50 char name[];
51};
52
53union proc_op {
54 int (*proc_get_link)(struct dentry *, struct path *);
55 int (*proc_read)(struct task_struct *task, char *page);
56 int (*proc_show)(struct seq_file *m,
57 struct pid_namespace *ns, struct pid *pid,
58 struct task_struct *task);
59};
60
61struct proc_inode {
62 struct pid *pid;
63 int fd;
64 union proc_op op;
65 struct proc_dir_entry *pde;
66 struct ctl_table_header *sysctl;
67 struct ctl_table *sysctl_entry;
68 struct proc_ns ns;
69 struct inode vfs_inode;
70};
71
72/*
73 * General functions
74 */
75static inline struct proc_inode *PROC_I(const struct inode *inode)
76{
77 return container_of(inode, struct proc_inode, vfs_inode);
78}
79
80static inline struct proc_dir_entry *PDE(const struct inode *inode)
81{
82 return PROC_I(inode)->pde;
83}
84
85static inline void *__PDE_DATA(const struct inode *inode)
86{
87 return PDE(inode)->data;
88}
89
90static inline struct pid *proc_pid(struct inode *inode)
91{
92 return PROC_I(inode)->pid;
93}
94
95static inline struct task_struct *get_proc_task(struct inode *inode)
96{
97 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
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_DUMP_USER)
111 return 1;
112 return 0;
113}
114
115static inline unsigned name_to_int(struct dentry *dentry)
116{
117 const char *name = dentry->d_name.name;
118 int len = dentry->d_name.len;
119 unsigned n = 0;
120
121 if (len > 1 && *name == '0')
122 goto out;
123 while (len-- > 0) {
124 unsigned c = *name++ - '0';
125 if (c > 9)
126 goto out;
127 if (n >= (~0U-9)/10)
128 goto out;
129 n *= 10;
130 n += c;
131 }
132 return n;
133out:
134 return ~0U;
135}
136
137/*
138 * Offset of the first process in the /proc root directory..
139 */
140#define FIRST_PROCESS_ENTRY 256
141
142/* Worst case buffer size needed for holding an integer. */
143#define PROC_NUMBUF 13
144
145/*
146 * array.c
147 */
148extern const struct file_operations proc_tid_children_operations;
149
150extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
151 struct pid *, struct task_struct *);
152extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
153 struct pid *, struct task_struct *);
154extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
155 struct pid *, struct task_struct *);
156extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
157 struct pid *, struct task_struct *);
158
159/*
160 * base.c
161 */
162extern const struct dentry_operations pid_dentry_operations;
163extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *);
164extern int proc_setattr(struct dentry *, struct iattr *);
165extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *);
166extern int pid_revalidate(struct dentry *, unsigned int);
167extern int pid_delete_dentry(const struct dentry *);
168extern int proc_pid_readdir(struct file *, struct dir_context *);
169extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
170extern loff_t mem_lseek(struct file *, loff_t, int);
171
172/* Lookups */
173typedef int instantiate_t(struct inode *, struct dentry *,
174 struct task_struct *, const void *);
175extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
176 instantiate_t, struct task_struct *, const void *);
177
178/*
179 * generic.c
180 */
181extern spinlock_t proc_subdir_lock;
182
183extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
184extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
185 struct dentry *);
186extern int proc_readdir(struct file *, struct dir_context *);
187extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
188
189static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
190{
191 atomic_inc(&pde->count);
192 return pde;
193}
194extern void pde_put(struct proc_dir_entry *);
195
196/*
197 * inode.c
198 */
199struct pde_opener {
200 struct file *file;
201 struct list_head lh;
202 int closing;
203 struct completion *c;
204};
205
206extern const struct inode_operations proc_pid_link_inode_operations;
207
208extern void proc_init_inodecache(void);
209extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
210extern int proc_fill_super(struct super_block *);
211extern void proc_entry_rundown(struct proc_dir_entry *);
212
213/*
214 * proc_devtree.c
215 */
216#ifdef CONFIG_PROC_DEVICETREE
217extern void proc_device_tree_init(void);
218#endif
219
220/*
221 * proc_namespaces.c
222 */
223extern const struct inode_operations proc_ns_dir_inode_operations;
224extern const struct file_operations proc_ns_dir_operations;
225
226/*
227 * proc_net.c
228 */
229extern const struct file_operations proc_net_operations;
230extern const struct inode_operations proc_net_inode_operations;
231
232#ifdef CONFIG_NET
233extern int proc_net_init(void);
234#else
235static inline int proc_net_init(void) { return 0; }
236#endif
237
238/*
239 * proc_self.c
240 */
241extern int proc_setup_self(struct super_block *);
242
243/*
244 * proc_sysctl.c
245 */
246#ifdef CONFIG_PROC_SYSCTL
247extern int proc_sys_init(void);
248extern void sysctl_head_put(struct ctl_table_header *);
249#else
250static inline void proc_sys_init(void) { }
251static inline void sysctl_head_put(struct ctl_table_header *head) { }
252#endif
253
254/*
255 * proc_tty.c
256 */
257#ifdef CONFIG_TTY
258extern void proc_tty_init(void);
259#else
260static inline void proc_tty_init(void) {}
261#endif
262
263/*
264 * root.c
265 */
266extern struct proc_dir_entry proc_root;
267
268extern void proc_self_init(void);
269extern int proc_remount(struct super_block *, int *, char *);
270
271/*
272 * task_[no]mmu.c
273 */
274struct proc_maps_private {
275 struct pid *pid;
276 struct task_struct *task;
277#ifdef CONFIG_MMU
278 struct vm_area_struct *tail_vma;
279#endif
280#ifdef CONFIG_NUMA
281 struct mempolicy *task_mempolicy;
282#endif
283};
284
285extern const struct file_operations proc_pid_maps_operations;
286extern const struct file_operations proc_tid_maps_operations;
287extern const struct file_operations proc_pid_numa_maps_operations;
288extern const struct file_operations proc_tid_numa_maps_operations;
289extern const struct file_operations proc_pid_smaps_operations;
290extern const struct file_operations proc_tid_smaps_operations;
291extern const struct file_operations proc_clear_refs_operations;
292extern const struct file_operations proc_pagemap_operations;
293
294extern unsigned long task_vsize(struct mm_struct *);
295extern unsigned long task_statm(struct mm_struct *,
296 unsigned long *, unsigned long *,
297 unsigned long *, unsigned long *);
298extern void task_mem(struct seq_file *, struct mm_struct *);