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TOMOYO Linux Cross Reference
Linux/fs/proc/internal.h

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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 
 18 struct ctl_table_header;
 19 struct 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  * parent/subdir are used for the directory structure (every /proc file has a
 28  * parent, but "subdir" is empty for all non-directory entries).
 29  * subdir_node is used to build the rb tree "subdir" of the parent.
 30  */
 31 struct proc_dir_entry {
 32         unsigned int low_ino;
 33         umode_t mode;
 34         nlink_t nlink;
 35         kuid_t uid;
 36         kgid_t gid;
 37         loff_t size;
 38         const struct inode_operations *proc_iops;
 39         const struct file_operations *proc_fops;
 40         struct proc_dir_entry *parent;
 41         struct rb_root subdir;
 42         struct rb_node subdir_node;
 43         void *data;
 44         atomic_t count;         /* use count */
 45         atomic_t in_use;        /* number of callers into module in progress; */
 46                         /* negative -> it's going away RSN */
 47         struct completion *pde_unload_completion;
 48         struct list_head pde_openers;   /* who did ->open, but not ->release */
 49         spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
 50         u8 namelen;
 51         char name[];
 52 };
 53 
 54 union proc_op {
 55         int (*proc_get_link)(struct dentry *, struct path *);
 56         int (*proc_show)(struct seq_file *m,
 57                 struct pid_namespace *ns, struct pid *pid,
 58                 struct task_struct *task);
 59 };
 60 
 61 struct 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         const struct proc_ns_operations *ns_ops;
 69         struct inode vfs_inode;
 70 };
 71 
 72 /*
 73  * General functions
 74  */
 75 static inline struct proc_inode *PROC_I(const struct inode *inode)
 76 {
 77         return container_of(inode, struct proc_inode, vfs_inode);
 78 }
 79 
 80 static inline struct proc_dir_entry *PDE(const struct inode *inode)
 81 {
 82         return PROC_I(inode)->pde;
 83 }
 84 
 85 static inline void *__PDE_DATA(const struct inode *inode)
 86 {
 87         return PDE(inode)->data;
 88 }
 89 
 90 static inline struct pid *proc_pid(struct inode *inode)
 91 {
 92         return PROC_I(inode)->pid;
 93 }
 94 
 95 static inline struct task_struct *get_proc_task(struct inode *inode)
 96 {
 97         return get_pid_task(proc_pid(inode), PIDTYPE_PID);
 98 }
 99 
100 static 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 
115 static inline unsigned name_to_int(const struct qstr *qstr)
116 {
117         const char *name = qstr->name;
118         int len = qstr->len;
119         unsigned n = 0;
120 
121         if (len > 1 && *name == '')
122                 goto out;
123         while (len-- > 0) {
124                 unsigned c = *name++ - '';
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;
133 out:
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  */
148 extern const struct file_operations proc_tid_children_operations;
149 
150 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
151                          struct pid *, struct task_struct *);
152 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
153                           struct pid *, struct task_struct *);
154 extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
155                            struct pid *, struct task_struct *);
156 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
157                           struct pid *, struct task_struct *);
158 
159 /*
160  * base.c
161  */
162 extern const struct dentry_operations pid_dentry_operations;
163 extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *);
164 extern int proc_setattr(struct dentry *, struct iattr *);
165 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *);
166 extern int pid_revalidate(struct dentry *, unsigned int);
167 extern int pid_delete_dentry(const struct dentry *);
168 extern int proc_pid_readdir(struct file *, struct dir_context *);
169 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
170 extern loff_t mem_lseek(struct file *, loff_t, int);
171 
172 /* Lookups */
173 typedef int instantiate_t(struct inode *, struct dentry *,
174                                      struct task_struct *, const void *);
175 extern 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  */
181 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
182 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
183                                      struct dentry *);
184 extern int proc_readdir(struct file *, struct dir_context *);
185 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
186 
187 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
188 {
189         atomic_inc(&pde->count);
190         return pde;
191 }
192 extern void pde_put(struct proc_dir_entry *);
193 
194 static inline bool is_empty_pde(const struct proc_dir_entry *pde)
195 {
196         return S_ISDIR(pde->mode) && !pde->proc_iops;
197 }
198 struct proc_dir_entry *proc_create_mount_point(const char *name);
199 
200 /*
201  * inode.c
202  */
203 struct pde_opener {
204         struct file *file;
205         struct list_head lh;
206         int closing;
207         struct completion *c;
208 };
209 extern const struct inode_operations proc_link_inode_operations;
210 
211 extern const struct inode_operations proc_pid_link_inode_operations;
212 
213 extern void proc_init_inodecache(void);
214 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
215 extern int proc_fill_super(struct super_block *);
216 extern void proc_entry_rundown(struct proc_dir_entry *);
217 
218 /*
219  * proc_namespaces.c
220  */
221 extern const struct inode_operations proc_ns_dir_inode_operations;
222 extern const struct file_operations proc_ns_dir_operations;
223 
224 /*
225  * proc_net.c
226  */
227 extern const struct file_operations proc_net_operations;
228 extern const struct inode_operations proc_net_inode_operations;
229 
230 #ifdef CONFIG_NET
231 extern int proc_net_init(void);
232 #else
233 static inline int proc_net_init(void) { return 0; }
234 #endif
235 
236 /*
237  * proc_self.c
238  */
239 extern int proc_setup_self(struct super_block *);
240 
241 /*
242  * proc_thread_self.c
243  */
244 extern int proc_setup_thread_self(struct super_block *);
245 extern void proc_thread_self_init(void);
246 
247 /*
248  * proc_sysctl.c
249  */
250 #ifdef CONFIG_PROC_SYSCTL
251 extern int proc_sys_init(void);
252 extern void sysctl_head_put(struct ctl_table_header *);
253 #else
254 static inline void proc_sys_init(void) { }
255 static inline void sysctl_head_put(struct ctl_table_header *head) { }
256 #endif
257 
258 /*
259  * proc_tty.c
260  */
261 #ifdef CONFIG_TTY
262 extern void proc_tty_init(void);
263 #else
264 static inline void proc_tty_init(void) {}
265 #endif
266 
267 /*
268  * root.c
269  */
270 extern struct proc_dir_entry proc_root;
271 
272 extern void proc_self_init(void);
273 extern int proc_remount(struct super_block *, int *, char *);
274 
275 /*
276  * task_[no]mmu.c
277  */
278 struct proc_maps_private {
279         struct inode *inode;
280         struct task_struct *task;
281         struct mm_struct *mm;
282 #ifdef CONFIG_MMU
283         struct vm_area_struct *tail_vma;
284 #endif
285 #ifdef CONFIG_NUMA
286         struct mempolicy *task_mempolicy;
287 #endif
288 };
289 
290 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
291 
292 extern const struct file_operations proc_pid_maps_operations;
293 extern const struct file_operations proc_tid_maps_operations;
294 extern const struct file_operations proc_pid_numa_maps_operations;
295 extern const struct file_operations proc_tid_numa_maps_operations;
296 extern const struct file_operations proc_pid_smaps_operations;
297 extern const struct file_operations proc_tid_smaps_operations;
298 extern const struct file_operations proc_clear_refs_operations;
299 extern const struct file_operations proc_pagemap_operations;
300 
301 extern unsigned long task_vsize(struct mm_struct *);
302 extern unsigned long task_statm(struct mm_struct *,
303                                 unsigned long *, unsigned long *,
304                                 unsigned long *, unsigned long *);
305 extern void task_mem(struct seq_file *, struct mm_struct *);
306 

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