1 /* Internal procfs definitions
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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>
17 #include <linux/sched/coredump.h>
18 #include <linux/sched/task.h>
20 struct ctl_table_header;
24 * This is not completely implemented yet. The idea is to
25 * create an in-memory tree (like the actual /proc filesystem
26 * tree) of these proc_dir_entries, so that we can dynamically
27 * add new files to /proc.
29 * parent/subdir are used for the directory structure (every /proc file has a
30 * parent, but "subdir" is empty for all non-directory entries).
31 * subdir_node is used to build the rb tree "subdir" of the parent.
33 struct proc_dir_entry {
40 const struct inode_operations *proc_iops;
41 const struct file_operations *proc_fops;
42 struct proc_dir_entry *parent;
43 struct rb_root_cached subdir;
44 struct rb_node subdir_node;
46 atomic_t count; /* use count */
47 atomic_t in_use; /* number of callers into module in progress; */
48 /* negative -> it's going away RSN */
49 struct completion *pde_unload_completion;
50 struct list_head pde_openers; /* who did ->open, but not ->release */
51 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
57 int (*proc_get_link)(struct dentry *, struct path *);
58 int (*proc_show)(struct seq_file *m,
59 struct pid_namespace *ns, struct pid *pid,
60 struct task_struct *task);
67 struct proc_dir_entry *pde;
68 struct ctl_table_header *sysctl;
69 struct ctl_table *sysctl_entry;
70 struct hlist_node sysctl_inodes;
71 const struct proc_ns_operations *ns_ops;
72 struct inode vfs_inode;
78 static inline struct proc_inode *PROC_I(const struct inode *inode)
80 return container_of(inode, struct proc_inode, vfs_inode);
83 static inline struct proc_dir_entry *PDE(const struct inode *inode)
85 return PROC_I(inode)->pde;
88 static inline void *__PDE_DATA(const struct inode *inode)
90 return PDE(inode)->data;
93 static inline struct pid *proc_pid(struct inode *inode)
95 return PROC_I(inode)->pid;
98 static inline struct task_struct *get_proc_task(struct inode *inode)
100 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
103 void task_dump_owner(struct task_struct *task, umode_t mode,
104 kuid_t *ruid, kgid_t *rgid);
106 unsigned name_to_int(const struct qstr *qstr);
108 * Offset of the first process in the /proc root directory..
110 #define FIRST_PROCESS_ENTRY 256
112 /* Worst case buffer size needed for holding an integer. */
113 #define PROC_NUMBUF 13
118 extern const struct file_operations proc_tid_children_operations;
120 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
121 struct pid *, struct task_struct *);
122 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
123 struct pid *, struct task_struct *);
124 extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
125 struct pid *, struct task_struct *);
126 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
127 struct pid *, struct task_struct *);
132 extern const struct dentry_operations pid_dentry_operations;
133 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
134 extern int proc_setattr(struct dentry *, struct iattr *);
135 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
136 extern int pid_revalidate(struct dentry *, unsigned int);
137 extern int pid_delete_dentry(const struct dentry *);
138 extern int proc_pid_readdir(struct file *, struct dir_context *);
139 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
140 extern loff_t mem_lseek(struct file *, loff_t, int);
143 typedef int instantiate_t(struct inode *, struct dentry *,
144 struct task_struct *, const void *);
145 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int,
146 instantiate_t, struct task_struct *, const void *);
151 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
152 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
154 extern int proc_readdir(struct file *, struct dir_context *);
155 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
157 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
159 atomic_inc(&pde->count);
162 extern void pde_put(struct proc_dir_entry *);
164 static inline bool is_empty_pde(const struct proc_dir_entry *pde)
166 return S_ISDIR(pde->mode) && !pde->proc_iops;
176 struct completion *c;
178 extern const struct inode_operations proc_link_inode_operations;
180 extern const struct inode_operations proc_pid_link_inode_operations;
182 extern void proc_init_inodecache(void);
183 void set_proc_pid_nlink(void);
184 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
185 extern int proc_fill_super(struct super_block *, void *data, int flags);
186 extern void proc_entry_rundown(struct proc_dir_entry *);
191 extern const struct inode_operations proc_ns_dir_inode_operations;
192 extern const struct file_operations proc_ns_dir_operations;
197 extern const struct file_operations proc_net_operations;
198 extern const struct inode_operations proc_net_inode_operations;
201 extern int proc_net_init(void);
203 static inline int proc_net_init(void) { return 0; }
209 extern int proc_setup_self(struct super_block *);
214 extern int proc_setup_thread_self(struct super_block *);
215 extern void proc_thread_self_init(void);
220 #ifdef CONFIG_PROC_SYSCTL
221 extern int proc_sys_init(void);
222 extern void proc_sys_evict_inode(struct inode *inode,
223 struct ctl_table_header *head);
225 static inline void proc_sys_init(void) { }
226 static inline void proc_sys_evict_inode(struct inode *inode,
227 struct ctl_table_header *head) { }
234 extern void proc_tty_init(void);
236 static inline void proc_tty_init(void) {}
242 extern struct proc_dir_entry proc_root;
243 extern int proc_parse_options(char *options, struct pid_namespace *pid);
245 extern void proc_self_init(void);
246 extern int proc_remount(struct super_block *, int *, char *);
251 struct mem_size_stats;
252 struct proc_maps_private {
254 struct task_struct *task;
255 struct mm_struct *mm;
256 struct mem_size_stats *rollup;
258 struct vm_area_struct *tail_vma;
261 struct mempolicy *task_mempolicy;
263 } __randomize_layout;
265 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
267 extern const struct file_operations proc_pid_maps_operations;
268 extern const struct file_operations proc_tid_maps_operations;
269 extern const struct file_operations proc_pid_numa_maps_operations;
270 extern const struct file_operations proc_tid_numa_maps_operations;
271 extern const struct file_operations proc_pid_smaps_operations;
272 extern const struct file_operations proc_pid_smaps_rollup_operations;
273 extern const struct file_operations proc_tid_smaps_operations;
274 extern const struct file_operations proc_clear_refs_operations;
275 extern const struct file_operations proc_pagemap_operations;
277 extern unsigned long task_vsize(struct mm_struct *);
278 extern unsigned long task_statm(struct mm_struct *,
279 unsigned long *, unsigned long *,
280 unsigned long *, unsigned long *);
281 extern void task_mem(struct seq_file *, struct mm_struct *);