1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* linux/fs/proc/root.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* proc root directory handling functions
*/
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/config.h>
#include <linux/init.h>
#include <asm/bitops.h>
struct proc_dir_entry *proc_net, *proc_bus, *proc_root_fs, *proc_root_driver;
#ifdef CONFIG_SYSCTL
struct proc_dir_entry *proc_sys_root;
#endif
void __init proc_root_init(void)
{
proc_misc_init();
proc_net = proc_mkdir("net", 0);
#ifdef CONFIG_SYSVIPC
proc_mkdir("sysvipc", 0);
#endif
#ifdef CONFIG_SYSCTL
proc_sys_root = proc_mkdir("sys", 0);
#endif
proc_root_fs = proc_mkdir("fs", 0);
proc_root_driver = proc_mkdir("driver", 0);
#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
/* just give it a mountpoint */
proc_mkdir("openprom", 0);
#endif
proc_tty_init();
#ifdef CONFIG_PROC_DEVICETREE
proc_device_tree_init();
#endif
proc_bus = proc_mkdir("bus", 0);
}
static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry)
{
if (dir->i_ino == PROC_ROOT_INO) { /* check for safety... */
int nlink = proc_root.nlink;
nlink += nr_threads;
dir->i_nlink = nlink;
}
if (!proc_lookup(dir, dentry))
return NULL;
return proc_pid_lookup(dir, dentry);
}
static int proc_root_readdir(struct file * filp,
void * dirent, filldir_t filldir)
{
unsigned int nr = filp->f_pos;
if (nr < FIRST_PROCESS_ENTRY) {
int error = proc_readdir(filp, dirent, filldir);
if (error <= 0)
return error;
filp->f_pos = FIRST_PROCESS_ENTRY;
}
return proc_pid_readdir(filp, dirent, filldir);
}
/*
* The root /proc directory is special, as it has the
* <pid> directories. Thus we don't use the generic
* directory handling functions for that..
*/
static struct file_operations proc_root_operations = {
read: generic_read_dir,
readdir: proc_root_readdir,
};
/*
* proc root can do almost nothing..
*/
static struct inode_operations proc_root_inode_operations = {
lookup: proc_root_lookup,
};
/*
* This is the root "inode" in the /proc tree..
*/
struct proc_dir_entry proc_root = {
low_ino: PROC_ROOT_INO,
namelen: 5,
name: "/proc",
mode: S_IFDIR | S_IRUGO | S_IXUGO,
nlink: 2,
proc_iops: &proc_root_inode_operations,
proc_fops: &proc_root_operations,
parent: &proc_root,
};
|
