Commit | Line | Data |
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59d8053f | 1 | /* Internal procfs definitions |
1da177e4 LT |
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> | |
59d8053f | 13 | #include <linux/proc_ns.h> |
9cdd83e3 | 14 | #include <linux/refcount.h> |
59d8053f DH |
15 | #include <linux/spinlock.h> |
16 | #include <linux/atomic.h> | |
e579d2c2 | 17 | #include <linux/binfmts.h> |
f7ccbae4 | 18 | #include <linux/sched/coredump.h> |
f719ff9b | 19 | #include <linux/sched/task.h> |
1da177e4 | 20 | |
59d8053f DH |
21 | struct ctl_table_header; |
22 | struct mempolicy; | |
77b14db5 | 23 | |
59d8053f DH |
24 | /* |
25 | * This is not completely implemented yet. The idea is to | |
26 | * create an in-memory tree (like the actual /proc filesystem | |
27 | * tree) of these proc_dir_entries, so that we can dynamically | |
28 | * add new files to /proc. | |
29 | * | |
710585d4 ND |
30 | * parent/subdir are used for the directory structure (every /proc file has a |
31 | * parent, but "subdir" is empty for all non-directory entries). | |
32 | * subdir_node is used to build the rb tree "subdir" of the parent. | |
59d8053f DH |
33 | */ |
34 | struct proc_dir_entry { | |
163cf548 AD |
35 | /* |
36 | * number of callers into module in progress; | |
37 | * negative -> it's going away RSN | |
38 | */ | |
39 | atomic_t in_use; | |
9cdd83e3 | 40 | refcount_t refcnt; |
163cf548 | 41 | struct list_head pde_openers; /* who did ->open, but not ->release */ |
53f63345 AD |
42 | /* protects ->pde_openers and all struct pde_opener instances */ |
43 | spinlock_t pde_unload_lock; | |
163cf548 AD |
44 | struct completion *pde_unload_completion; |
45 | const struct inode_operations *proc_iops; | |
46 | const struct file_operations *proc_fops; | |
47 | void *data; | |
59d8053f | 48 | unsigned int low_ino; |
59d8053f DH |
49 | nlink_t nlink; |
50 | kuid_t uid; | |
51 | kgid_t gid; | |
52 | loff_t size; | |
710585d4 | 53 | struct proc_dir_entry *parent; |
4f113437 | 54 | struct rb_root subdir; |
710585d4 | 55 | struct rb_node subdir_node; |
b4884f23 | 56 | char *name; |
163cf548 | 57 | umode_t mode; |
59d8053f | 58 | u8 namelen; |
b4884f23 | 59 | #ifdef CONFIG_64BIT |
4f113437 | 60 | #define SIZEOF_PDE_INLINE_NAME (192-139) |
b4884f23 | 61 | #else |
4f113437 | 62 | #define SIZEOF_PDE_INLINE_NAME (128-87) |
b4884f23 AD |
63 | #endif |
64 | char inline_name[SIZEOF_PDE_INLINE_NAME]; | |
3859a271 | 65 | } __randomize_layout; |
1da177e4 | 66 | |
b4884f23 AD |
67 | extern struct kmem_cache *proc_dir_entry_cache; |
68 | void pde_free(struct proc_dir_entry *pde); | |
69 | ||
59d8053f DH |
70 | union proc_op { |
71 | int (*proc_get_link)(struct dentry *, struct path *); | |
59d8053f DH |
72 | int (*proc_show)(struct seq_file *m, |
73 | struct pid_namespace *ns, struct pid *pid, | |
74 | struct task_struct *task); | |
75 | }; | |
99f89551 | 76 | |
59d8053f | 77 | struct proc_inode { |
f2beb798 | 78 | struct pid *pid; |
771187d6 | 79 | unsigned int fd; |
59d8053f DH |
80 | union proc_op op; |
81 | struct proc_dir_entry *pde; | |
82 | struct ctl_table_header *sysctl; | |
83 | struct ctl_table *sysctl_entry; | |
2fd1d2c4 | 84 | struct hlist_node sysctl_inodes; |
3d3d35b1 | 85 | const struct proc_ns_operations *ns_ops; |
59d8053f | 86 | struct inode vfs_inode; |
3859a271 | 87 | } __randomize_layout; |
f2beb798 | 88 | |
c30480b9 DH |
89 | /* |
90 | * General functions | |
91 | */ | |
92 | static inline struct proc_inode *PROC_I(const struct inode *inode) | |
93 | { | |
94 | return container_of(inode, struct proc_inode, vfs_inode); | |
95 | } | |
96 | ||
97 | static inline struct proc_dir_entry *PDE(const struct inode *inode) | |
98 | { | |
99 | return PROC_I(inode)->pde; | |
100 | } | |
101 | ||
102 | static inline void *__PDE_DATA(const struct inode *inode) | |
103 | { | |
104 | return PDE(inode)->data; | |
105 | } | |
fee781e6 | 106 | |
13b41b09 | 107 | static inline struct pid *proc_pid(struct inode *inode) |
99f89551 | 108 | { |
13b41b09 | 109 | return PROC_I(inode)->pid; |
99f89551 EB |
110 | } |
111 | ||
112 | static inline struct task_struct *get_proc_task(struct inode *inode) | |
1da177e4 | 113 | { |
13b41b09 | 114 | return get_pid_task(proc_pid(inode), PIDTYPE_PID); |
1da177e4 LT |
115 | } |
116 | ||
c6eb50d2 | 117 | void task_dump_owner(struct task_struct *task, umode_t mode, |
68eb94f1 | 118 | kuid_t *ruid, kgid_t *rgid); |
faf60af1 | 119 | |
3ee2a199 | 120 | unsigned name_to_int(const struct qstr *qstr); |
1dd704b6 | 121 | /* |
59d8053f | 122 | * Offset of the first process in the /proc root directory.. |
1dd704b6 | 123 | */ |
59d8053f | 124 | #define FIRST_PROCESS_ENTRY 256 |
1dd704b6 | 125 | |
59d8053f DH |
126 | /* Worst case buffer size needed for holding an integer. */ |
127 | #define PROC_NUMBUF 13 | |
881adb85 | 128 | |
59d8053f DH |
129 | /* |
130 | * array.c | |
131 | */ | |
132 | extern const struct file_operations proc_tid_children_operations; | |
3174c21b | 133 | |
59d8053f DH |
134 | extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, |
135 | struct pid *, struct task_struct *); | |
136 | extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, | |
137 | struct pid *, struct task_struct *); | |
138 | extern int proc_pid_status(struct seq_file *, struct pid_namespace *, | |
139 | struct pid *, struct task_struct *); | |
140 | extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, | |
141 | struct pid *, struct task_struct *); | |
142 | ||
143 | /* | |
144 | * base.c | |
145 | */ | |
146 | extern const struct dentry_operations pid_dentry_operations; | |
a528d35e | 147 | extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int); |
59d8053f | 148 | extern int proc_setattr(struct dentry *, struct iattr *); |
db978da8 | 149 | extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); |
59d8053f DH |
150 | extern int pid_revalidate(struct dentry *, unsigned int); |
151 | extern int pid_delete_dentry(const struct dentry *); | |
f0c3b509 | 152 | extern int proc_pid_readdir(struct file *, struct dir_context *); |
59d8053f DH |
153 | extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); |
154 | extern loff_t mem_lseek(struct file *, loff_t, int); | |
866ad9a7 | 155 | |
59d8053f | 156 | /* Lookups */ |
c52a47ac | 157 | typedef int instantiate_t(struct inode *, struct dentry *, |
59d8053f | 158 | struct task_struct *, const void *); |
f0c3b509 | 159 | extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, |
59d8053f | 160 | instantiate_t, struct task_struct *, const void *); |
3174c21b | 161 | |
59d8053f DH |
162 | /* |
163 | * generic.c | |
164 | */ | |
59d8053f | 165 | extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); |
93ad5bc6 | 166 | struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *); |
f0c3b509 | 167 | extern int proc_readdir(struct file *, struct dir_context *); |
93ad5bc6 | 168 | int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *); |
3174c21b | 169 | |
135d5655 AD |
170 | static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) |
171 | { | |
9cdd83e3 | 172 | refcount_inc(&pde->refcnt); |
135d5655 AD |
173 | return pde; |
174 | } | |
59d8053f | 175 | extern void pde_put(struct proc_dir_entry *); |
3174c21b | 176 | |
eb6d38d5 EB |
177 | static inline bool is_empty_pde(const struct proc_dir_entry *pde) |
178 | { | |
179 | return S_ISDIR(pde->mode) && !pde->proc_iops; | |
180 | } | |
eb6d38d5 | 181 | |
3174c21b | 182 | /* |
59d8053f | 183 | * inode.c |
3174c21b | 184 | */ |
59d8053f DH |
185 | struct pde_opener { |
186 | struct file *file; | |
187 | struct list_head lh; | |
f5887c71 | 188 | bool closing; |
59d8053f | 189 | struct completion *c; |
a9fabc3d | 190 | } __randomize_layout; |
7e0e953b | 191 | extern const struct inode_operations proc_link_inode_operations; |
6b4e306a | 192 | |
59d8053f | 193 | extern const struct inode_operations proc_pid_link_inode_operations; |
6b4e306a | 194 | |
195b8cf0 | 195 | void proc_init_kmemcache(void); |
1270dd8d | 196 | void set_proc_pid_nlink(void); |
59d8053f | 197 | extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); |
e94591d0 | 198 | extern int proc_fill_super(struct super_block *, void *data, int flags); |
59d8053f | 199 | extern void proc_entry_rundown(struct proc_dir_entry *); |
6b4e306a | 200 | |
59d8053f DH |
201 | /* |
202 | * proc_namespaces.c | |
203 | */ | |
6b4e306a EB |
204 | extern const struct inode_operations proc_ns_dir_inode_operations; |
205 | extern const struct file_operations proc_ns_dir_operations; | |
206 | ||
59d8053f DH |
207 | /* |
208 | * proc_net.c | |
209 | */ | |
210 | extern const struct file_operations proc_net_operations; | |
211 | extern const struct inode_operations proc_net_inode_operations; | |
212 | ||
213 | #ifdef CONFIG_NET | |
214 | extern int proc_net_init(void); | |
215 | #else | |
216 | static inline int proc_net_init(void) { return 0; } | |
217 | #endif | |
218 | ||
219 | /* | |
220 | * proc_self.c | |
221 | */ | |
021ada7d | 222 | extern int proc_setup_self(struct super_block *); |
34db8aaf | 223 | |
0097875b EB |
224 | /* |
225 | * proc_thread_self.c | |
226 | */ | |
227 | extern int proc_setup_thread_self(struct super_block *); | |
228 | extern void proc_thread_self_init(void); | |
229 | ||
34db8aaf | 230 | /* |
59d8053f | 231 | * proc_sysctl.c |
34db8aaf | 232 | */ |
59d8053f DH |
233 | #ifdef CONFIG_PROC_SYSCTL |
234 | extern int proc_sys_init(void); | |
d6cffbbe KK |
235 | extern void proc_sys_evict_inode(struct inode *inode, |
236 | struct ctl_table_header *head); | |
59d8053f DH |
237 | #else |
238 | static inline void proc_sys_init(void) { } | |
d6cffbbe KK |
239 | static inline void proc_sys_evict_inode(struct inode *inode, |
240 | struct ctl_table_header *head) { } | |
59d8053f | 241 | #endif |
34db8aaf DH |
242 | |
243 | /* | |
244 | * proc_tty.c | |
245 | */ | |
246 | #ifdef CONFIG_TTY | |
247 | extern void proc_tty_init(void); | |
248 | #else | |
249 | static inline void proc_tty_init(void) {} | |
250 | #endif | |
59d8053f DH |
251 | |
252 | /* | |
253 | * root.c | |
254 | */ | |
255 | extern struct proc_dir_entry proc_root; | |
e94591d0 | 256 | extern int proc_parse_options(char *options, struct pid_namespace *pid); |
59d8053f DH |
257 | |
258 | extern void proc_self_init(void); | |
259 | extern int proc_remount(struct super_block *, int *, char *); | |
260 | ||
261 | /* | |
262 | * task_[no]mmu.c | |
263 | */ | |
493b0e9d | 264 | struct mem_size_stats; |
59d8053f | 265 | struct proc_maps_private { |
2c03376d | 266 | struct inode *inode; |
59d8053f | 267 | struct task_struct *task; |
29a40ace | 268 | struct mm_struct *mm; |
493b0e9d | 269 | struct mem_size_stats *rollup; |
59d8053f DH |
270 | #ifdef CONFIG_MMU |
271 | struct vm_area_struct *tail_vma; | |
272 | #endif | |
273 | #ifdef CONFIG_NUMA | |
274 | struct mempolicy *task_mempolicy; | |
275 | #endif | |
3859a271 | 276 | } __randomize_layout; |
59d8053f | 277 | |
5381e169 ON |
278 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode); |
279 | ||
59d8053f DH |
280 | extern const struct file_operations proc_pid_maps_operations; |
281 | extern const struct file_operations proc_tid_maps_operations; | |
282 | extern const struct file_operations proc_pid_numa_maps_operations; | |
283 | extern const struct file_operations proc_tid_numa_maps_operations; | |
284 | extern const struct file_operations proc_pid_smaps_operations; | |
493b0e9d | 285 | extern const struct file_operations proc_pid_smaps_rollup_operations; |
59d8053f DH |
286 | extern const struct file_operations proc_tid_smaps_operations; |
287 | extern const struct file_operations proc_clear_refs_operations; | |
288 | extern const struct file_operations proc_pagemap_operations; | |
289 | ||
290 | extern unsigned long task_vsize(struct mm_struct *); | |
291 | extern unsigned long task_statm(struct mm_struct *, | |
292 | unsigned long *, unsigned long *, | |
293 | unsigned long *, unsigned long *); | |
294 | extern void task_mem(struct seq_file *, struct mm_struct *); |