1 /* Internal procfs definitions
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
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>
18 struct ctl_table_header;
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.
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).
32 struct proc_dir_entry {
39 const struct inode_operations *proc_iops;
40 const struct file_operations *proc_fops;
41 struct proc_dir_entry *next, *parent, *subdir;
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 */
54 int (*proc_get_link)(struct dentry *, struct path *);
55 int (*proc_show)(struct seq_file *m,
56 struct pid_namespace *ns, struct pid *pid,
57 struct task_struct *task);
64 struct proc_dir_entry *pde;
65 struct ctl_table_header *sysctl;
66 struct ctl_table *sysctl_entry;
68 struct inode vfs_inode;
74 static inline struct proc_inode *PROC_I(const struct inode *inode)
76 return container_of(inode, struct proc_inode, vfs_inode);
79 static inline struct proc_dir_entry *PDE(const struct inode *inode)
81 return PROC_I(inode)->pde;
84 static inline void *__PDE_DATA(const struct inode *inode)
86 return PDE(inode)->data;
89 static inline struct pid *proc_pid(struct inode *inode)
91 return PROC_I(inode)->pid;
94 static inline struct task_struct *get_proc_task(struct inode *inode)
96 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
99 static inline int task_dumpable(struct task_struct *task)
102 struct mm_struct *mm;
107 dumpable = get_dumpable(mm);
109 if (dumpable == SUID_DUMP_USER)
114 static inline unsigned name_to_int(const struct qstr *qstr)
116 const char *name = qstr->name;
120 if (len > 1 && *name == '0')
123 unsigned c = *name++ - '0';
137 * Offset of the first process in the /proc root directory..
139 #define FIRST_PROCESS_ENTRY 256
141 /* Worst case buffer size needed for holding an integer. */
142 #define PROC_NUMBUF 13
147 extern const struct file_operations proc_tid_children_operations;
149 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
150 struct pid *, struct task_struct *);
151 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
152 struct pid *, struct task_struct *);
153 extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
154 struct pid *, struct task_struct *);
155 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
156 struct pid *, struct task_struct *);
161 extern const struct dentry_operations pid_dentry_operations;
162 extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *);
163 extern int proc_setattr(struct dentry *, struct iattr *);
164 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *);
165 extern int pid_revalidate(struct dentry *, unsigned int);
166 extern int pid_delete_dentry(const struct dentry *);
167 extern int proc_pid_readdir(struct file *, struct dir_context *);
168 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
169 extern loff_t mem_lseek(struct file *, loff_t, int);
172 typedef int instantiate_t(struct inode *, struct dentry *,
173 struct task_struct *, const void *);
174 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
175 instantiate_t, struct task_struct *, const void *);
180 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
181 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
183 extern int proc_readdir(struct file *, struct dir_context *);
184 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
186 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
188 atomic_inc(&pde->count);
191 extern void pde_put(struct proc_dir_entry *);
200 struct completion *c;
203 extern const struct inode_operations proc_pid_link_inode_operations;
205 extern void proc_init_inodecache(void);
206 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
207 extern int proc_fill_super(struct super_block *);
208 extern void proc_entry_rundown(struct proc_dir_entry *);
213 extern const struct inode_operations proc_ns_dir_inode_operations;
214 extern const struct file_operations proc_ns_dir_operations;
219 extern const struct file_operations proc_net_operations;
220 extern const struct inode_operations proc_net_inode_operations;
223 extern int proc_net_init(void);
225 static inline int proc_net_init(void) { return 0; }
231 extern int proc_setup_self(struct super_block *);
236 extern int proc_setup_thread_self(struct super_block *);
237 extern void proc_thread_self_init(void);
242 #ifdef CONFIG_PROC_SYSCTL
243 extern int proc_sys_init(void);
244 extern void sysctl_head_put(struct ctl_table_header *);
246 static inline void proc_sys_init(void) { }
247 static inline void sysctl_head_put(struct ctl_table_header *head) { }
254 extern void proc_tty_init(void);
256 static inline void proc_tty_init(void) {}
262 extern struct proc_dir_entry proc_root;
264 extern void proc_self_init(void);
265 extern int proc_remount(struct super_block *, int *, char *);
270 struct proc_maps_private {
272 struct task_struct *task;
273 struct mm_struct *mm;
275 struct vm_area_struct *tail_vma;
278 struct mempolicy *task_mempolicy;
282 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
284 extern const struct file_operations proc_pid_maps_operations;
285 extern const struct file_operations proc_tid_maps_operations;
286 extern const struct file_operations proc_pid_numa_maps_operations;
287 extern const struct file_operations proc_tid_numa_maps_operations;
288 extern const struct file_operations proc_pid_smaps_operations;
289 extern const struct file_operations proc_tid_smaps_operations;
290 extern const struct file_operations proc_clear_refs_operations;
291 extern const struct file_operations proc_pagemap_operations;
293 extern unsigned long task_vsize(struct mm_struct *);
294 extern unsigned long task_statm(struct mm_struct *,
295 unsigned long *, unsigned long *,
296 unsigned long *, unsigned long *);
297 extern void task_mem(struct seq_file *, struct mm_struct *);