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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  * 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  */
 32 struct 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[];
 51 };
 52 
 53 union 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 };
 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         struct proc_ns ns;
 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(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 == '')
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 spinlock_t proc_subdir_lock;
182 
183 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
184 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
185                                      struct dentry *);
186 extern int proc_readdir(struct file *, struct dir_context *);
187 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
188 
189 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
190 {
191         atomic_inc(&pde->count);
192         return pde;
193 }
194 extern void pde_put(struct proc_dir_entry *);
195 
196 /*
197  * inode.c
198  */
199 struct pde_opener {
200         struct file *file;
201         struct list_head lh;
202         int closing;
203         struct completion *c;
204 };
205 
206 extern const struct inode_operations proc_pid_link_inode_operations;
207 
208 extern void proc_init_inodecache(void);
209 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
210 extern int proc_fill_super(struct super_block *);
211 extern void proc_entry_rundown(struct proc_dir_entry *);
212 
213 /*
214  * proc_devtree.c
215  */
216 #ifdef CONFIG_PROC_DEVICETREE
217 extern void proc_device_tree_init(void);
218 #endif
219 
220 /*
221  * proc_namespaces.c
222  */
223 extern const struct inode_operations proc_ns_dir_inode_operations;
224 extern const struct file_operations proc_ns_dir_operations;
225 
226 /*
227  * proc_net.c
228  */
229 extern const struct file_operations proc_net_operations;
230 extern const struct inode_operations proc_net_inode_operations;
231 
232 #ifdef CONFIG_NET
233 extern int proc_net_init(void);
234 #else
235 static inline int proc_net_init(void) { return 0; }
236 #endif
237 
238 /*
239  * proc_self.c
240  */
241 extern int proc_setup_self(struct super_block *);
242 
243 /*
244  * proc_sysctl.c
245  */
246 #ifdef CONFIG_PROC_SYSCTL
247 extern int proc_sys_init(void);
248 extern void sysctl_head_put(struct ctl_table_header *);
249 #else
250 static inline void proc_sys_init(void) { }
251 static inline void sysctl_head_put(struct ctl_table_header *head) { }
252 #endif
253 
254 /*
255  * proc_tty.c
256  */
257 #ifdef CONFIG_TTY
258 extern void proc_tty_init(void);
259 #else
260 static inline void proc_tty_init(void) {}
261 #endif
262 
263 /*
264  * root.c
265  */
266 extern struct proc_dir_entry proc_root;
267 
268 extern void proc_self_init(void);
269 extern int proc_remount(struct super_block *, int *, char *);
270 
271 /*
272  * task_[no]mmu.c
273  */
274 struct proc_maps_private {
275         struct pid *pid;
276         struct task_struct *task;
277 #ifdef CONFIG_MMU
278         struct vm_area_struct *tail_vma;
279 #endif
280 #ifdef CONFIG_NUMA
281         struct mempolicy *task_mempolicy;
282 #endif
283 };
284 
285 extern const struct file_operations proc_pid_maps_operations;
286 extern const struct file_operations proc_tid_maps_operations;
287 extern const struct file_operations proc_pid_numa_maps_operations;
288 extern const struct file_operations proc_tid_numa_maps_operations;
289 extern const struct file_operations proc_pid_smaps_operations;
290 extern const struct file_operations proc_tid_smaps_operations;
291 extern const struct file_operations proc_clear_refs_operations;
292 extern const struct file_operations proc_pagemap_operations;
293 
294 extern unsigned long task_vsize(struct mm_struct *);
295 extern unsigned long task_statm(struct mm_struct *,
296                                 unsigned long *, unsigned long *,
297                                 unsigned long *, unsigned long *);
298 extern void task_mem(struct seq_file *, struct mm_struct *);
299 

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