1 #ifndef _LINUX_PROC_FS_H
2 #define _LINUX_PROC_FS_H
3
4 #include <linux/slab.h>
5 #include <linux/fs.h>
6 #include <linux/spinlock.h>
7 #include <linux/magic.h>
8 #include <asm/atomic.h>
9
10 struct net;
11 struct completion;
12
13 /*
14 * The proc filesystem constants/structures
15 */
16
17 /*
18 * Offset of the first process in the /proc root directory..
19 */
20 #define FIRST_PROCESS_ENTRY 256
21
22 /* Worst case buffer size needed for holding an integer. */
23 #define PROC_NUMBUF 13
24
25 /*
26 * We always define these enumerators
27 */
28
29 enum {
30 PROC_ROOT_INO = 1,
31 };
32
33 /*
34 * This is not completely implemented yet. The idea is to
35 * create an in-memory tree (like the actual /proc filesystem
36 * tree) of these proc_dir_entries, so that we can dynamically
37 * add new files to /proc.
38 *
39 * The "next" pointer creates a linked list of one /proc directory,
40 * while parent/subdir create the directory structure (every
41 * /proc file has a parent, but "subdir" is NULL for all
42 * non-directory entries).
43 *
44 * "get_info" is called at "read", while "owner" is used to protect module
45 * from unloading while proc_dir_entry is in use
46 */
47
48 typedef int (read_proc_t)(char *page, char **start, off_t off,
49 int count, int *eof, void *data);
50 typedef int (write_proc_t)(struct file *file, const char __user *buffer,
51 unsigned long count, void *data);
52 typedef int (get_info_t)(char *, char **, off_t, int);
53
54 struct proc_dir_entry {
55 unsigned int low_ino;
56 unsigned short namelen;
57 const char *name;
58 mode_t mode;
59 nlink_t nlink;
60 uid_t uid;
61 gid_t gid;
62 loff_t size;
63 const struct inode_operations *proc_iops;
64 /*
65 * NULL ->proc_fops means "PDE is going away RSN" or
66 * "PDE is just created". In either case, e.g. ->read_proc won't be
67 * called because it's too late or too early, respectively.
68 *
69 * If you're allocating ->proc_fops dynamically, save a pointer
70 * somewhere.
71 */
72 const struct file_operations *proc_fops;
73 get_info_t *get_info;
74 struct module *owner;
75 struct proc_dir_entry *next, *parent, *subdir;
76 void *data;
77 read_proc_t *read_proc;
78 write_proc_t *write_proc;
79 atomic_t count; /* use count */
80 int pde_users; /* number of callers into module in progress */
81 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
82 struct completion *pde_unload_completion;
83 };
84
85 struct kcore_list {
86 struct kcore_list *next;
87 unsigned long addr;
88 size_t size;
89 };
90
91 struct vmcore {
92 struct list_head list;
93 unsigned long long paddr;
94 unsigned long long size;
95 loff_t offset;
96 };
97
98 #ifdef CONFIG_PROC_FS
99
100 extern struct proc_dir_entry proc_root;
101 extern struct proc_dir_entry *proc_root_fs;
102 extern struct proc_dir_entry *proc_bus;
103 extern struct proc_dir_entry *proc_root_driver;
104 extern struct proc_dir_entry *proc_root_kcore;
105
106 extern spinlock_t proc_subdir_lock;
107
108 extern void proc_root_init(void);
109 extern void proc_misc_init(void);
110
111 struct mm_struct;
112
113 void proc_flush_task(struct task_struct *task);
114 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
115 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
116 unsigned long task_vsize(struct mm_struct *);
117 int task_statm(struct mm_struct *, int *, int *, int *, int *);
118 void task_mem(struct seq_file *, struct mm_struct *);
119 void clear_refs_smap(struct mm_struct *mm);
120
121 struct proc_dir_entry *de_get(struct proc_dir_entry *de);
122 void de_put(struct proc_dir_entry *de);
123
124 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
125 struct proc_dir_entry *parent);
126 struct proc_dir_entry *proc_create(const char *name, mode_t mode,
127 struct proc_dir_entry *parent,
128 const struct file_operations *proc_fops);
129 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
130
131 extern struct vfsmount *proc_mnt;
132 struct pid_namespace;
133 extern int proc_fill_super(struct super_block *);
134 extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
135
136 /*
137 * These are generic /proc routines that use the internal
138 * "struct proc_dir_entry" tree to traverse the filesystem.
139 *
140 * The /proc root directory has extended versions to take care
141 * of the /proc/<pid> subdirectories.
142 */
143 extern int proc_readdir(struct file *, void *, filldir_t);
144 extern struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
145
146 extern const struct file_operations proc_kcore_operations;
147 extern const struct file_operations proc_kmsg_operations;
148 extern const struct file_operations ppc_htab_operations;
149
150 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
151 extern void pid_ns_release_proc(struct pid_namespace *ns);
152
153 /*
154 * proc_tty.c
155 */
156 struct tty_driver;
157 extern void proc_tty_init(void);
158 extern void proc_tty_register_driver(struct tty_driver *driver);
159 extern void proc_tty_unregister_driver(struct tty_driver *driver);
160
161 /*
162 * proc_devtree.c
163 */
164 #ifdef CONFIG_PROC_DEVICETREE
165 struct device_node;
166 struct property;
167 extern void proc_device_tree_init(void);
168 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
169 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
170 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
171 struct property *prop);
172 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
173 struct property *newprop,
174 struct property *oldprop);
175 #endif /* CONFIG_PROC_DEVICETREE */
176
177 extern struct proc_dir_entry *proc_symlink(const char *,
178 struct proc_dir_entry *, const char *);
179 extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *);
180 extern struct proc_dir_entry *proc_mkdir_mode(const char *name, mode_t mode,
181 struct proc_dir_entry *parent);
182
183 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
184 mode_t mode, struct proc_dir_entry *base,
185 read_proc_t *read_proc, void * data)
186 {
187 struct proc_dir_entry *res=create_proc_entry(name,mode,base);
188 if (res) {
189 res->read_proc=read_proc;
190 res->data=data;
191 }
192 return res;
193 }
194
195 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
196 mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
197 {
198 struct proc_dir_entry *res=create_proc_entry(name,mode,base);
199 if (res) res->get_info=get_info;
200 return res;
201 }
202
203 extern struct proc_dir_entry *proc_net_fops_create(struct net *net,
204 const char *name, mode_t mode, const struct file_operations *fops);
205 extern void proc_net_remove(struct net *net, const char *name);
206 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
207 struct proc_dir_entry *parent);
208
209 #else
210
211 #define proc_root_driver NULL
212 #define proc_bus NULL
213
214 #define proc_net_fops_create(net, name, mode, fops) ({ (void)(mode), NULL; })
215 static inline void proc_net_remove(struct net *net, const char *name) {}
216
217 static inline void proc_flush_task(struct task_struct *task)
218 {
219 }
220
221 static inline struct proc_dir_entry *create_proc_entry(const char *name,
222 mode_t mode, struct proc_dir_entry *parent) { return NULL; }
223 static inline struct proc_dir_entry *proc_create(const char *name,
224 mode_t mode, struct proc_dir_entry *parent,
225 const struct file_operations *proc_fops)
226 {
227 return NULL;
228 }
229 #define remove_proc_entry(name, parent) do {} while (0)
230
231 static inline struct proc_dir_entry *proc_symlink(const char *name,
232 struct proc_dir_entry *parent,const char *dest) {return NULL;}
233 static inline struct proc_dir_entry *proc_mkdir(const char *name,
234 struct proc_dir_entry *parent) {return NULL;}
235
236 static inline struct proc_dir_entry *create_proc_read_entry(const char *name,
237 mode_t mode, struct proc_dir_entry *base,
238 read_proc_t *read_proc, void * data) { return NULL; }
239 static inline struct proc_dir_entry *create_proc_info_entry(const char *name,
240 mode_t mode, struct proc_dir_entry *base, get_info_t *get_info)
241 { return NULL; }
242
243 struct tty_driver;
244 static inline void proc_tty_register_driver(struct tty_driver *driver) {};
245 static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
246
247 extern struct proc_dir_entry proc_root;
248
249 static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
250 {
251 return 0;
252 }
253
254 static inline void pid_ns_release_proc(struct pid_namespace *ns)
255 {
256 }
257
258 #endif /* CONFIG_PROC_FS */
259
260 #if !defined(CONFIG_PROC_KCORE)
261 static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
262 {
263 }
264 #else
265 extern void kclist_add(struct kcore_list *, void *, size_t);
266 #endif
267
268 union proc_op {
269 int (*proc_get_link)(struct inode *, struct path *);
270 int (*proc_read)(struct task_struct *task, char *page);
271 int (*proc_show)(struct seq_file *m,
272 struct pid_namespace *ns, struct pid *pid,
273 struct task_struct *task);
274 };
275
276 struct proc_inode {
277 struct pid *pid;
278 int fd;
279 union proc_op op;
280 struct proc_dir_entry *pde;
281 struct inode vfs_inode;
282 };
283
284 static inline struct proc_inode *PROC_I(const struct inode *inode)
285 {
286 return container_of(inode, struct proc_inode, vfs_inode);
287 }
288
289 static inline struct proc_dir_entry *PDE(const struct inode *inode)
290 {
291 return PROC_I(inode)->pde;
292 }
293
294 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
295 {
296 return pde->parent->data;
297 }
298
299 struct net *get_proc_net(const struct inode *inode);
300
301 struct proc_maps_private {
302 struct pid *pid;
303 struct task_struct *task;
304 #ifdef CONFIG_MMU
305 struct vm_area_struct *tail_vma;
306 #endif
307 };
308
309 #endif /* _LINUX_PROC_FS_H */
310
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