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David Howells59d80532013-04-11 13:34:43 +01001/* Internal procfs definitions
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
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>
David Howells59d80532013-04-11 13:34:43 +010013#include <linux/proc_ns.h>
14#include <linux/spinlock.h>
15#include <linux/atomic.h>
Kees Cooke579d2c2013-02-27 17:03:15 -080016#include <linux/binfmts.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
David Howells59d80532013-04-11 13:34:43 +010018struct ctl_table_header;
19struct mempolicy;
Eric W. Biederman77b14db2007-02-14 00:34:12 -080020
David Howells59d80532013-04-11 13:34:43 +010021/*
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[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070051};
52
David Howells59d80532013-04-11 13:34:43 +010053union 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};
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
David Howells59d80532013-04-11 13:34:43 +010061struct proc_inode {
Stephen Wilsonf2beb792011-05-24 17:12:48 -070062 struct pid *pid;
David Howells59d80532013-04-11 13:34:43 +010063 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;
Stephen Wilsonf2beb792011-05-24 17:12:48 -070070};
71
David Howellsc30480b2013-04-12 18:03:36 +010072/*
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
Eric W. Biederman13b41b02006-06-26 00:25:56 -070090static inline struct pid *proc_pid(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
Eric W. Biederman13b41b02006-06-26 00:25:56 -070092 return PROC_I(inode)->pid;
Eric W. Biederman99f89552006-06-26 00:25:55 -070093}
94
95static inline struct task_struct *get_proc_task(struct inode *inode)
96{
Eric W. Biederman13b41b02006-06-26 00:25:56 -070097 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Cyrill Gorcunovfaf60af2012-08-23 14:43:24 +0400100static 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);
Kees Cooke579d2c2013-02-27 17:03:15 -0800110 if (dumpable == SUID_DUMP_USER)
Cyrill Gorcunovfaf60af2012-08-23 14:43:24 +0400111 return 1;
112 return 0;
113}
114
Cyrill Gorcunovfaf60af2012-08-23 14:43:24 +0400115static 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
David Howells1dd704b2013-04-12 01:08:50 +0100137/*
David Howells59d80532013-04-11 13:34:43 +0100138 * 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/*
David Howells1dd704b2013-04-12 01:08:50 +0100160 * base.c
161 */
David Howells59d80532013-04-11 13:34:43 +0100162extern 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);
David Howells1dd704b2013-04-12 01:08:50 +0100167extern int pid_delete_dentry(const struct dentry *);
David Howells59d80532013-04-11 13:34:43 +0100168extern int proc_pid_readdir(struct file *, void *, filldir_t);
169extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
170extern loff_t mem_lseek(struct file *, loff_t, int);
David Howells1dd704b2013-04-12 01:08:50 +0100171
David Howells59d80532013-04-11 13:34:43 +0100172/* Lookups */
173typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
174 struct task_struct *, const void *);
175extern int proc_fill_cache(struct file *, void *, filldir_t, const char *, int,
176 instantiate_t, struct task_struct *, const void *);
Alexey Dobriyan881adb82008-07-25 01:48:29 -0700177
David Howells59d80532013-04-11 13:34:43 +0100178/*
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 *, void *, filldir_t);
187extern int proc_readdir_de(struct proc_dir_entry *, struct file *, void *, filldir_t);
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 */
Alexey Dobriyan881adb82008-07-25 01:48:29 -0700199struct pde_opener {
Alexey Dobriyan881adb82008-07-25 01:48:29 -0700200 struct file *file;
Alexey Dobriyan881adb82008-07-25 01:48:29 -0700201 struct list_head lh;
Al Viro05c0ae22013-04-04 16:28:47 -0400202 int closing;
203 struct completion *c;
Alexey Dobriyan881adb82008-07-25 01:48:29 -0700204};
Al Viro866ad9a2013-04-03 19:07:30 -0400205
David Howells59d80532013-04-11 13:34:43 +0100206extern const struct inode_operations proc_pid_link_inode_operations;
Al Viro3174c212009-04-07 13:19:18 -0400207
David Howells59d80532013-04-11 13:34:43 +0100208extern 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 *);
Al Viro3174c212009-04-07 13:19:18 -0400212
213/*
David Howells59d80532013-04-11 13:34:43 +0100214 * mmu.c
Al Viro3174c212009-04-07 13:19:18 -0400215 */
David Howells59d80532013-04-11 13:34:43 +0100216struct vmalloc_info {
217 unsigned long used;
218 unsigned long largest_chunk;
219};
Eric W. Biederman6b4e3062010-03-07 16:41:34 -0800220
David Howells59d80532013-04-11 13:34:43 +0100221#ifdef CONFIG_MMU
222#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
223extern void get_vmalloc_info(struct vmalloc_info *);
Eric W. Biederman6b4e3062010-03-07 16:41:34 -0800224
David Howells59d80532013-04-11 13:34:43 +0100225#else
226#define VMALLOC_TOTAL 0UL
227static inline void get_vmalloc_info(struct vmalloc_info *vmi)
228{
229 vmi->used = 0;
230 vmi->largest_chunk = 0;
231}
232#endif
David Howells34db8aa2013-04-12 02:29:19 +0100233
234/*
235 * proc_devtree.c
236 */
237#ifdef CONFIG_PROC_DEVICETREE
238extern void proc_device_tree_init(void);
David Howells59d80532013-04-11 13:34:43 +0100239#endif
240
241/*
242 * proc_namespaces.c
243 */
244extern const struct inode_operations proc_ns_dir_inode_operations;
245extern const struct file_operations proc_ns_dir_operations;
246
247/*
248 * proc_net.c
249 */
250extern const struct file_operations proc_net_operations;
251extern const struct inode_operations proc_net_inode_operations;
252
253#ifdef CONFIG_NET
254extern int proc_net_init(void);
255#else
256static inline int proc_net_init(void) { return 0; }
257#endif
258
259/*
260 * proc_self.c
261 */
262extern int proc_setup_self(struct super_block *);
263
264/*
265 * proc_sysctl.c
266 */
267#ifdef CONFIG_PROC_SYSCTL
268extern int proc_sys_init(void);
269extern void sysctl_head_put(struct ctl_table_header *);
270#else
271static inline void proc_sys_init(void) { }
272static inline void sysctl_head_put(struct ctl_table_header *head) { }
273#endif
David Howells34db8aa2013-04-12 02:29:19 +0100274
275/*
276 * proc_tty.c
277 */
278#ifdef CONFIG_TTY
279extern void proc_tty_init(void);
280#else
281static inline void proc_tty_init(void) {}
282#endif
David Howells59d80532013-04-11 13:34:43 +0100283
284/*
285 * root.c
286 */
287extern struct proc_dir_entry proc_root;
288
289extern void proc_self_init(void);
290extern int proc_remount(struct super_block *, int *, char *);
291
292/*
293 * task_[no]mmu.c
294 */
295struct proc_maps_private {
296 struct pid *pid;
297 struct task_struct *task;
298#ifdef CONFIG_MMU
299 struct vm_area_struct *tail_vma;
300#endif
301#ifdef CONFIG_NUMA
302 struct mempolicy *task_mempolicy;
303#endif
304};
305
306extern const struct file_operations proc_pid_maps_operations;
307extern const struct file_operations proc_tid_maps_operations;
308extern const struct file_operations proc_pid_numa_maps_operations;
309extern const struct file_operations proc_tid_numa_maps_operations;
310extern const struct file_operations proc_pid_smaps_operations;
311extern const struct file_operations proc_tid_smaps_operations;
312extern const struct file_operations proc_clear_refs_operations;
313extern const struct file_operations proc_pagemap_operations;
314
315extern unsigned long task_vsize(struct mm_struct *);
316extern unsigned long task_statm(struct mm_struct *,
317 unsigned long *, unsigned long *,
318 unsigned long *, unsigned long *);
319extern void task_mem(struct seq_file *, struct mm_struct *);