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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
18struct ctl_table_header;
19struct 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 */
31struct 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
54union 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
61struct 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 */
75static inline struct proc_inode *PROC_I(const struct inode *inode)
76{
77 return container_of(inode, struct proc_inode, vfs_inode);
78}
79
80static inline struct proc_dir_entry *PDE(const struct inode *inode)
81{
82 return PROC_I(inode)->pde;
83}
84
85static inline void *__PDE_DATA(const struct inode *inode)
86{
87 return PDE(inode)->data;
88}
89
90static inline struct pid *proc_pid(struct inode *inode)
91{
92 return PROC_I(inode)->pid;
93}
94
95static inline struct task_struct *get_proc_task(struct inode *inode)
96{
97 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
98}
99
100static 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
115static 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 == '0')
122 goto out;
123 while (len-- > 0) {
124 unsigned c = *name++ - '0';
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;
133out:
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 */
148extern const struct file_operations proc_tid_children_operations;
149
150extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
151 struct pid *, struct task_struct *);
152extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,
153 struct pid *, struct task_struct *);
154extern int proc_pid_status(struct seq_file *, struct pid_namespace *,
155 struct pid *, struct task_struct *);
156extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
157 struct pid *, struct task_struct *);
158
159/*
160 * base.c
161 */
162extern const struct dentry_operations pid_dentry_operations;
163extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *);
164extern int proc_setattr(struct dentry *, struct iattr *);
165extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *);
166extern int pid_revalidate(struct dentry *, unsigned int);
167extern int pid_delete_dentry(const struct dentry *);
168extern int proc_pid_readdir(struct file *, struct dir_context *);
169extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int);
170extern loff_t mem_lseek(struct file *, loff_t, int);
171
172/* Lookups */
173typedef int instantiate_t(struct inode *, struct dentry *,
174 struct task_struct *, const void *);
175extern 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 */
181extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
182extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
183 struct dentry *);
184extern int proc_readdir(struct file *, struct dir_context *);
185extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
186
187static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
188{
189 atomic_inc(&pde->count);
190 return pde;
191}
192extern void pde_put(struct proc_dir_entry *);
193
194static inline bool is_empty_pde(const struct proc_dir_entry *pde)
195{
196 return S_ISDIR(pde->mode) && !pde->proc_iops;
197}
198struct proc_dir_entry *proc_create_mount_point(const char *name);
199
200/*
201 * inode.c
202 */
203struct pde_opener {
204 struct file *file;
205 struct list_head lh;
206 int closing;
207 struct completion *c;
208};
209extern const struct inode_operations proc_link_inode_operations;
210
211extern const struct inode_operations proc_pid_link_inode_operations;
212
213extern void proc_init_inodecache(void);
214extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
215extern int proc_fill_super(struct super_block *);
216extern void proc_entry_rundown(struct proc_dir_entry *);
217
218/*
219 * proc_namespaces.c
220 */
221extern const struct inode_operations proc_ns_dir_inode_operations;
222extern const struct file_operations proc_ns_dir_operations;
223
224/*
225 * proc_net.c
226 */
227extern const struct file_operations proc_net_operations;
228extern const struct inode_operations proc_net_inode_operations;
229
230#ifdef CONFIG_NET
231extern int proc_net_init(void);
232#else
233static inline int proc_net_init(void) { return 0; }
234#endif
235
236/*
237 * proc_self.c
238 */
239extern int proc_setup_self(struct super_block *);
240
241/*
242 * proc_thread_self.c
243 */
244extern int proc_setup_thread_self(struct super_block *);
245extern void proc_thread_self_init(void);
246
247/*
248 * proc_sysctl.c
249 */
250#ifdef CONFIG_PROC_SYSCTL
251extern int proc_sys_init(void);
252extern void sysctl_head_put(struct ctl_table_header *);
253#else
254static inline void proc_sys_init(void) { }
255static inline void sysctl_head_put(struct ctl_table_header *head) { }
256#endif
257
258/*
259 * proc_tty.c
260 */
261#ifdef CONFIG_TTY
262extern void proc_tty_init(void);
263#else
264static inline void proc_tty_init(void) {}
265#endif
266
267/*
268 * root.c
269 */
270extern struct proc_dir_entry proc_root;
271
272extern void proc_self_init(void);
273extern int proc_remount(struct super_block *, int *, char *);
274
275/*
276 * task_[no]mmu.c
277 */
278struct 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
290struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
291
292extern const struct file_operations proc_pid_maps_operations;
293extern const struct file_operations proc_tid_maps_operations;
294extern const struct file_operations proc_pid_numa_maps_operations;
295extern const struct file_operations proc_tid_numa_maps_operations;
296extern const struct file_operations proc_pid_smaps_operations;
297extern const struct file_operations proc_tid_smaps_operations;
298extern const struct file_operations proc_clear_refs_operations;
299extern const struct file_operations proc_pagemap_operations;
300
301extern unsigned long task_vsize(struct mm_struct *);
302extern unsigned long task_statm(struct mm_struct *,
303 unsigned long *, unsigned long *,
304 unsigned long *, unsigned long *);
305extern void task_mem(struct seq_file *, struct mm_struct *);
1/* internal.h: 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>
13struct ctl_table_header;
14
15extern struct proc_dir_entry proc_root;
16#ifdef CONFIG_PROC_SYSCTL
17extern int proc_sys_init(void);
18extern void sysctl_head_put(struct ctl_table_header *head);
19#else
20static inline void proc_sys_init(void) { }
21static inline void sysctl_head_put(struct ctl_table_header *head) { }
22#endif
23#ifdef CONFIG_NET
24extern int proc_net_init(void);
25#else
26static inline int proc_net_init(void) { return 0; }
27#endif
28
29struct vmalloc_info {
30 unsigned long used;
31 unsigned long largest_chunk;
32};
33
34#ifdef CONFIG_MMU
35#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
36extern void get_vmalloc_info(struct vmalloc_info *vmi);
37#else
38
39#define VMALLOC_TOTAL 0UL
40#define get_vmalloc_info(vmi) \
41do { \
42 (vmi)->used = 0; \
43 (vmi)->largest_chunk = 0; \
44} while(0)
45#endif
46
47extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
48 struct pid *pid, struct task_struct *task);
49extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
50 struct pid *pid, struct task_struct *task);
51extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
52 struct pid *pid, struct task_struct *task);
53extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
54 struct pid *pid, struct task_struct *task);
55extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
56
57extern const struct file_operations proc_tid_children_operations;
58extern const struct file_operations proc_pid_maps_operations;
59extern const struct file_operations proc_tid_maps_operations;
60extern const struct file_operations proc_pid_numa_maps_operations;
61extern const struct file_operations proc_tid_numa_maps_operations;
62extern const struct file_operations proc_pid_smaps_operations;
63extern const struct file_operations proc_tid_smaps_operations;
64extern const struct file_operations proc_clear_refs_operations;
65extern const struct file_operations proc_pagemap_operations;
66extern const struct file_operations proc_net_operations;
67extern const struct inode_operations proc_net_inode_operations;
68
69struct proc_maps_private {
70 struct pid *pid;
71 struct task_struct *task;
72#ifdef CONFIG_MMU
73 struct vm_area_struct *tail_vma;
74#endif
75};
76
77void proc_init_inodecache(void);
78
79static inline struct pid *proc_pid(struct inode *inode)
80{
81 return PROC_I(inode)->pid;
82}
83
84static inline struct task_struct *get_proc_task(struct inode *inode)
85{
86 return get_pid_task(proc_pid(inode), PIDTYPE_PID);
87}
88
89static inline int proc_fd(struct inode *inode)
90{
91 return PROC_I(inode)->fd;
92}
93
94struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
95 struct dentry *dentry);
96int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
97 filldir_t filldir);
98
99struct pde_opener {
100 struct inode *inode;
101 struct file *file;
102 int (*release)(struct inode *, struct file *);
103 struct list_head lh;
104};
105void pde_users_dec(struct proc_dir_entry *pde);
106
107extern spinlock_t proc_subdir_lock;
108
109struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
110int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
111unsigned long task_vsize(struct mm_struct *);
112unsigned long task_statm(struct mm_struct *,
113 unsigned long *, unsigned long *, unsigned long *, unsigned long *);
114void task_mem(struct seq_file *, struct mm_struct *);
115
116static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
117{
118 atomic_inc(&pde->count);
119 return pde;
120}
121void pde_put(struct proc_dir_entry *pde);
122
123int proc_fill_super(struct super_block *);
124struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
125int proc_remount(struct super_block *sb, int *flags, char *data);
126
127/*
128 * These are generic /proc routines that use the internal
129 * "struct proc_dir_entry" tree to traverse the filesystem.
130 *
131 * The /proc root directory has extended versions to take care
132 * of the /proc/<pid> subdirectories.
133 */
134int proc_readdir(struct file *, void *, filldir_t);
135struct dentry *proc_lookup(struct inode *, struct dentry *, struct nameidata *);
136
137
138
139/* Lookups */
140typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
141 struct task_struct *, const void *);
142int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
143 const char *name, int len,
144 instantiate_t instantiate, struct task_struct *task, const void *ptr);
145int pid_revalidate(struct dentry *dentry, struct nameidata *nd);
146struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
147extern const struct dentry_operations pid_dentry_operations;
148int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
149int proc_setattr(struct dentry *dentry, struct iattr *attr);
150
151extern const struct inode_operations proc_ns_dir_inode_operations;
152extern const struct file_operations proc_ns_dir_operations;
153