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; | |
3f3942ac CH |
47 | union { |
48 | const struct seq_operations *seq_ops; | |
49 | int (*single_show)(struct seq_file *, void *); | |
50 | }; | |
564def71 | 51 | proc_write_t write; |
163cf548 | 52 | void *data; |
44414d82 | 53 | unsigned int state_size; |
59d8053f | 54 | unsigned int low_ino; |
59d8053f DH |
55 | nlink_t nlink; |
56 | kuid_t uid; | |
57 | kgid_t gid; | |
58 | loff_t size; | |
710585d4 | 59 | struct proc_dir_entry *parent; |
4f113437 | 60 | struct rb_root subdir; |
710585d4 | 61 | struct rb_node subdir_node; |
b4884f23 | 62 | char *name; |
163cf548 | 63 | umode_t mode; |
59d8053f | 64 | u8 namelen; |
24074a35 | 65 | char inline_name[]; |
3859a271 | 66 | } __randomize_layout; |
1da177e4 | 67 | |
2d6e4e82 AD |
68 | #define SIZEOF_PDE ( \ |
69 | sizeof(struct proc_dir_entry) < 128 ? 128 : \ | |
70 | sizeof(struct proc_dir_entry) < 192 ? 192 : \ | |
71 | sizeof(struct proc_dir_entry) < 256 ? 256 : \ | |
72 | sizeof(struct proc_dir_entry) < 512 ? 512 : \ | |
73 | 0) | |
74 | #define SIZEOF_PDE_INLINE_NAME (SIZEOF_PDE - sizeof(struct proc_dir_entry)) | |
24074a35 | 75 | |
b4884f23 AD |
76 | extern struct kmem_cache *proc_dir_entry_cache; |
77 | void pde_free(struct proc_dir_entry *pde); | |
78 | ||
59d8053f DH |
79 | union proc_op { |
80 | int (*proc_get_link)(struct dentry *, struct path *); | |
59d8053f DH |
81 | int (*proc_show)(struct seq_file *m, |
82 | struct pid_namespace *ns, struct pid *pid, | |
83 | struct task_struct *task); | |
84 | }; | |
99f89551 | 85 | |
59d8053f | 86 | struct proc_inode { |
f2beb798 | 87 | struct pid *pid; |
771187d6 | 88 | unsigned int fd; |
59d8053f DH |
89 | union proc_op op; |
90 | struct proc_dir_entry *pde; | |
91 | struct ctl_table_header *sysctl; | |
92 | struct ctl_table *sysctl_entry; | |
2fd1d2c4 | 93 | struct hlist_node sysctl_inodes; |
3d3d35b1 | 94 | const struct proc_ns_operations *ns_ops; |
59d8053f | 95 | struct inode vfs_inode; |
3859a271 | 96 | } __randomize_layout; |
f2beb798 | 97 | |
c30480b9 DH |
98 | /* |
99 | * General functions | |
100 | */ | |
101 | static inline struct proc_inode *PROC_I(const struct inode *inode) | |
102 | { | |
103 | return container_of(inode, struct proc_inode, vfs_inode); | |
104 | } | |
105 | ||
106 | static inline struct proc_dir_entry *PDE(const struct inode *inode) | |
107 | { | |
108 | return PROC_I(inode)->pde; | |
109 | } | |
110 | ||
111 | static inline void *__PDE_DATA(const struct inode *inode) | |
112 | { | |
113 | return PDE(inode)->data; | |
114 | } | |
fee781e6 | 115 | |
891ae71d | 116 | static inline struct pid *proc_pid(const struct inode *inode) |
99f89551 | 117 | { |
13b41b09 | 118 | return PROC_I(inode)->pid; |
99f89551 EB |
119 | } |
120 | ||
891ae71d | 121 | static inline struct task_struct *get_proc_task(const struct inode *inode) |
1da177e4 | 122 | { |
13b41b09 | 123 | return get_pid_task(proc_pid(inode), PIDTYPE_PID); |
1da177e4 LT |
124 | } |
125 | ||
c6eb50d2 | 126 | void task_dump_owner(struct task_struct *task, umode_t mode, |
68eb94f1 | 127 | kuid_t *ruid, kgid_t *rgid); |
faf60af1 | 128 | |
3ee2a199 | 129 | unsigned name_to_int(const struct qstr *qstr); |
1dd704b6 | 130 | /* |
59d8053f | 131 | * Offset of the first process in the /proc root directory.. |
1dd704b6 | 132 | */ |
59d8053f | 133 | #define FIRST_PROCESS_ENTRY 256 |
1dd704b6 | 134 | |
59d8053f DH |
135 | /* Worst case buffer size needed for holding an integer. */ |
136 | #define PROC_NUMBUF 13 | |
881adb85 | 137 | |
59d8053f DH |
138 | /* |
139 | * array.c | |
140 | */ | |
141 | extern const struct file_operations proc_tid_children_operations; | |
3174c21b | 142 | |
88b72b31 TH |
143 | extern void proc_task_name(struct seq_file *m, struct task_struct *p, |
144 | bool escape); | |
59d8053f DH |
145 | extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, |
146 | struct pid *, struct task_struct *); | |
147 | extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, | |
148 | struct pid *, struct task_struct *); | |
149 | extern int proc_pid_status(struct seq_file *, struct pid_namespace *, | |
150 | struct pid *, struct task_struct *); | |
151 | extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, | |
152 | struct pid *, struct task_struct *); | |
153 | ||
154 | /* | |
155 | * base.c | |
156 | */ | |
157 | extern const struct dentry_operations pid_dentry_operations; | |
a528d35e | 158 | extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int); |
59d8053f | 159 | extern int proc_setattr(struct dentry *, struct iattr *); |
db978da8 | 160 | extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); |
1bbc5513 | 161 | extern void pid_update_inode(struct task_struct *, struct inode *); |
59d8053f | 162 | extern int pid_delete_dentry(const struct dentry *); |
f0c3b509 | 163 | extern int proc_pid_readdir(struct file *, struct dir_context *); |
59d8053f DH |
164 | extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); |
165 | extern loff_t mem_lseek(struct file *, loff_t, int); | |
866ad9a7 | 166 | |
59d8053f | 167 | /* Lookups */ |
0168b9e3 | 168 | typedef struct dentry *instantiate_t(struct dentry *, |
59d8053f | 169 | struct task_struct *, const void *); |
a4ef3895 | 170 | bool proc_fill_cache(struct file *, struct dir_context *, const char *, unsigned int, |
59d8053f | 171 | instantiate_t, struct task_struct *, const void *); |
3174c21b | 172 | |
59d8053f DH |
173 | /* |
174 | * generic.c | |
175 | */ | |
7aed53d1 CH |
176 | struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode, |
177 | struct proc_dir_entry **parent, void *data); | |
61172eae CH |
178 | struct proc_dir_entry *proc_register(struct proc_dir_entry *dir, |
179 | struct proc_dir_entry *dp); | |
59d8053f | 180 | extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); |
93ad5bc6 | 181 | struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *); |
f0c3b509 | 182 | extern int proc_readdir(struct file *, struct dir_context *); |
93ad5bc6 | 183 | int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *); |
3174c21b | 184 | |
135d5655 AD |
185 | static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) |
186 | { | |
9cdd83e3 | 187 | refcount_inc(&pde->refcnt); |
135d5655 AD |
188 | return pde; |
189 | } | |
59d8053f | 190 | extern void pde_put(struct proc_dir_entry *); |
3174c21b | 191 | |
eb6d38d5 EB |
192 | static inline bool is_empty_pde(const struct proc_dir_entry *pde) |
193 | { | |
194 | return S_ISDIR(pde->mode) && !pde->proc_iops; | |
195 | } | |
564def71 | 196 | extern ssize_t proc_simple_write(struct file *, const char __user *, size_t, loff_t *); |
eb6d38d5 | 197 | |
3174c21b | 198 | /* |
59d8053f | 199 | * inode.c |
3174c21b | 200 | */ |
59d8053f DH |
201 | struct pde_opener { |
202 | struct file *file; | |
203 | struct list_head lh; | |
f5887c71 | 204 | bool closing; |
59d8053f | 205 | struct completion *c; |
a9fabc3d | 206 | } __randomize_layout; |
7e0e953b | 207 | extern const struct inode_operations proc_link_inode_operations; |
6b4e306a | 208 | |
59d8053f | 209 | extern const struct inode_operations proc_pid_link_inode_operations; |
6b4e306a | 210 | |
195b8cf0 | 211 | void proc_init_kmemcache(void); |
1270dd8d | 212 | void set_proc_pid_nlink(void); |
59d8053f | 213 | extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); |
e94591d0 | 214 | extern int proc_fill_super(struct super_block *, void *data, int flags); |
59d8053f | 215 | extern void proc_entry_rundown(struct proc_dir_entry *); |
6b4e306a | 216 | |
59d8053f DH |
217 | /* |
218 | * proc_namespaces.c | |
219 | */ | |
6b4e306a EB |
220 | extern const struct inode_operations proc_ns_dir_inode_operations; |
221 | extern const struct file_operations proc_ns_dir_operations; | |
222 | ||
59d8053f DH |
223 | /* |
224 | * proc_net.c | |
225 | */ | |
226 | extern const struct file_operations proc_net_operations; | |
227 | extern const struct inode_operations proc_net_inode_operations; | |
228 | ||
229 | #ifdef CONFIG_NET | |
230 | extern int proc_net_init(void); | |
231 | #else | |
232 | static inline int proc_net_init(void) { return 0; } | |
233 | #endif | |
234 | ||
235 | /* | |
236 | * proc_self.c | |
237 | */ | |
021ada7d | 238 | extern int proc_setup_self(struct super_block *); |
34db8aaf | 239 | |
0097875b EB |
240 | /* |
241 | * proc_thread_self.c | |
242 | */ | |
243 | extern int proc_setup_thread_self(struct super_block *); | |
244 | extern void proc_thread_self_init(void); | |
245 | ||
34db8aaf | 246 | /* |
59d8053f | 247 | * proc_sysctl.c |
34db8aaf | 248 | */ |
59d8053f DH |
249 | #ifdef CONFIG_PROC_SYSCTL |
250 | extern int proc_sys_init(void); | |
d6cffbbe KK |
251 | extern void proc_sys_evict_inode(struct inode *inode, |
252 | struct ctl_table_header *head); | |
59d8053f DH |
253 | #else |
254 | static inline void proc_sys_init(void) { } | |
d6cffbbe KK |
255 | static inline void proc_sys_evict_inode(struct inode *inode, |
256 | struct ctl_table_header *head) { } | |
59d8053f | 257 | #endif |
34db8aaf DH |
258 | |
259 | /* | |
260 | * proc_tty.c | |
261 | */ | |
262 | #ifdef CONFIG_TTY | |
263 | extern void proc_tty_init(void); | |
264 | #else | |
265 | static inline void proc_tty_init(void) {} | |
266 | #endif | |
59d8053f DH |
267 | |
268 | /* | |
269 | * root.c | |
270 | */ | |
271 | extern struct proc_dir_entry proc_root; | |
e94591d0 | 272 | extern int proc_parse_options(char *options, struct pid_namespace *pid); |
59d8053f DH |
273 | |
274 | extern void proc_self_init(void); | |
275 | extern int proc_remount(struct super_block *, int *, char *); | |
276 | ||
277 | /* | |
278 | * task_[no]mmu.c | |
279 | */ | |
493b0e9d | 280 | struct mem_size_stats; |
59d8053f | 281 | struct proc_maps_private { |
2c03376d | 282 | struct inode *inode; |
59d8053f | 283 | struct task_struct *task; |
29a40ace | 284 | struct mm_struct *mm; |
59d8053f DH |
285 | #ifdef CONFIG_MMU |
286 | struct vm_area_struct *tail_vma; | |
287 | #endif | |
288 | #ifdef CONFIG_NUMA | |
289 | struct mempolicy *task_mempolicy; | |
290 | #endif | |
3859a271 | 291 | } __randomize_layout; |
59d8053f | 292 | |
5381e169 ON |
293 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode); |
294 | ||
59d8053f | 295 | extern const struct file_operations proc_pid_maps_operations; |
59d8053f | 296 | extern const struct file_operations proc_pid_numa_maps_operations; |
59d8053f | 297 | extern const struct file_operations proc_pid_smaps_operations; |
493b0e9d | 298 | extern const struct file_operations proc_pid_smaps_rollup_operations; |
59d8053f DH |
299 | extern const struct file_operations proc_clear_refs_operations; |
300 | extern const struct file_operations proc_pagemap_operations; | |
301 | ||
302 | extern unsigned long task_vsize(struct mm_struct *); | |
303 | extern unsigned long task_statm(struct mm_struct *, | |
304 | unsigned long *, unsigned long *, | |
305 | unsigned long *, unsigned long *); | |
306 | extern void task_mem(struct seq_file *, struct mm_struct *); |