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/refcount.h>
15 #include <linux/spinlock.h>
16 #include <linux/atomic.h>
17 #include <linux/binfmts.h>
18 #include <linux/sched/coredump.h>
19 #include <linux/sched/task.h>
21 struct ctl_table_header;
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.
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.
34 struct proc_dir_entry {
36 * number of callers into module in progress;
37 * negative -> it's going away RSN
41 struct list_head pde_openers; /* who did ->open, but not ->release */
42 /* protects ->pde_openers and all struct pde_opener instances */
43 spinlock_t pde_unload_lock;
44 struct completion *pde_unload_completion;
45 const struct inode_operations *proc_iops;
46 const struct file_operations *proc_fops;
48 const struct seq_operations *seq_ops;
49 int (*single_show)(struct seq_file *, void *);
53 unsigned int state_size;
59 struct proc_dir_entry *parent;
60 struct rb_root subdir;
61 struct rb_node subdir_node;
66 #define SIZEOF_PDE_INLINE_NAME (192-155)
68 #define SIZEOF_PDE_INLINE_NAME (128-95)
70 char inline_name[SIZEOF_PDE_INLINE_NAME];
73 extern struct kmem_cache *proc_dir_entry_cache;
74 void pde_free(struct proc_dir_entry *pde);
77 int (*proc_get_link)(struct dentry *, struct path *);
78 int (*proc_show)(struct seq_file *m,
79 struct pid_namespace *ns, struct pid *pid,
80 struct task_struct *task);
87 struct proc_dir_entry *pde;
88 struct ctl_table_header *sysctl;
89 struct ctl_table *sysctl_entry;
90 struct hlist_node sysctl_inodes;
91 const struct proc_ns_operations *ns_ops;
92 struct inode vfs_inode;
98 static inline struct proc_inode *PROC_I(const struct inode *inode)
100 return container_of(inode, struct proc_inode, vfs_inode);
103 static inline struct proc_dir_entry *PDE(const struct inode *inode)
105 return PROC_I(inode)->pde;
108 static inline void *__PDE_DATA(const struct inode *inode)
110 return PDE(inode)->data;
113 static inline struct pid *proc_pid(struct inode *inode)
115 return PROC_I(inode)->pid;
118 static inline struct task_struct *get_proc_task(struct inode *inode)
120 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
123 void task_dump_owner(struct task_struct *task, umode_t mode,
124 kuid_t *ruid, kgid_t *rgid);
126 unsigned name_to_int(const struct qstr *qstr);
128 * Offset of the first process in the /proc root directory..
130 #define FIRST_PROCESS_ENTRY 256
132 /* Worst case buffer size needed for holding an integer. */
133 #define PROC_NUMBUF 13
138 extern const struct file_operations proc_tid_children_operations;
140 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
141 struct pid *, struct task_struct *);
142 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
143 struct pid *, struct task_struct *);
144 extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
145 struct pid *, struct task_struct *);
146 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
147 struct pid *, struct task_struct *);
152 extern const struct dentry_operations pid_dentry_operations;
153 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
154 extern int proc_setattr(struct dentry *, struct iattr *);
155 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
156 extern int pid_revalidate(struct dentry *, unsigned int);
157 extern int pid_delete_dentry(const struct dentry *);
158 extern int proc_pid_readdir(struct file *, struct dir_context *);
159 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
160 extern loff_t mem_lseek(struct file *, loff_t, int);
163 typedef int instantiate_t(struct inode *, struct dentry *,
164 struct task_struct *, const void *);
165 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
166 instantiate_t, struct task_struct *, const void *);
171 struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode,
172 struct proc_dir_entry **parent, void *data);
173 struct proc_dir_entry *proc_register(struct proc_dir_entry *dir,
174 struct proc_dir_entry *dp);
175 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
176 struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);
177 extern int proc_readdir(struct file *, struct dir_context *);
178 int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *);
180 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
182 refcount_inc(&pde->refcnt);
185 extern void pde_put(struct proc_dir_entry *);
187 static inline bool is_empty_pde(const struct proc_dir_entry *pde)
189 return S_ISDIR(pde->mode) && !pde->proc_iops;
191 extern ssize_t proc_simple_write(struct file *, const char __user *, size_t, loff_t *);
200 struct completion *c;
201 } __randomize_layout;
202 extern const struct inode_operations proc_link_inode_operations;
204 extern const struct inode_operations proc_pid_link_inode_operations;
206 void proc_init_kmemcache(void);
207 void set_proc_pid_nlink(void);
208 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
209 extern int proc_fill_super(struct super_block *, void *data, int flags);
210 extern void proc_entry_rundown(struct proc_dir_entry *);
215 extern const struct inode_operations proc_ns_dir_inode_operations;
216 extern const struct file_operations proc_ns_dir_operations;
221 extern const struct file_operations proc_net_operations;
222 extern const struct inode_operations proc_net_inode_operations;
225 extern int proc_net_init(void);
227 static inline int proc_net_init(void) { return 0; }
233 extern int proc_setup_self(struct super_block *);
238 extern int proc_setup_thread_self(struct super_block *);
239 extern void proc_thread_self_init(void);
244 #ifdef CONFIG_PROC_SYSCTL
245 extern int proc_sys_init(void);
246 extern void proc_sys_evict_inode(struct inode *inode,
247 struct ctl_table_header *head);
249 static inline void proc_sys_init(void) { }
250 static inline void proc_sys_evict_inode(struct inode *inode,
251 struct ctl_table_header *head) { }
258 extern void proc_tty_init(void);
260 static inline void proc_tty_init(void) {}
266 extern struct proc_dir_entry proc_root;
267 extern int proc_parse_options(char *options, struct pid_namespace *pid);
269 extern void proc_self_init(void);
270 extern int proc_remount(struct super_block *, int *, char *);
275 struct mem_size_stats;
276 struct proc_maps_private {
278 struct task_struct *task;
279 struct mm_struct *mm;
280 struct mem_size_stats *rollup;
282 struct vm_area_struct *tail_vma;
285 struct mempolicy *task_mempolicy;
287 } __randomize_layout;
289 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
291 extern const struct file_operations proc_pid_maps_operations;
292 extern const struct file_operations proc_tid_maps_operations;
293 extern const struct file_operations proc_pid_numa_maps_operations;
294 extern const struct file_operations proc_tid_numa_maps_operations;
295 extern const struct file_operations proc_pid_smaps_operations;
296 extern const struct file_operations proc_pid_smaps_rollup_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;
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 *);