Linux kernel mirror (for testing)
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linux
1/*
2 * linux/fs/proc/root.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc root directory handling functions
7 */
8
9#include <asm/uaccess.h>
10
11#include <linux/errno.h>
12#include <linux/time.h>
13#include <linux/proc_fs.h>
14#include <linux/stat.h>
15#include <linux/config.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/bitops.h>
19#include <linux/smp_lock.h>
20
21struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
22
23#ifdef CONFIG_SYSCTL
24struct proc_dir_entry *proc_sys_root;
25#endif
26
27static struct super_block *proc_get_sb(struct file_system_type *fs_type,
28 int flags, const char *dev_name, void *data)
29{
30 return get_sb_single(fs_type, flags, data, proc_fill_super);
31}
32
33static struct file_system_type proc_fs_type = {
34 .name = "proc",
35 .get_sb = proc_get_sb,
36 .kill_sb = kill_anon_super,
37};
38
39extern int __init proc_init_inodecache(void);
40void __init proc_root_init(void)
41{
42 int err = proc_init_inodecache();
43 if (err)
44 return;
45 err = register_filesystem(&proc_fs_type);
46 if (err)
47 return;
48 proc_mnt = kern_mount(&proc_fs_type);
49 err = PTR_ERR(proc_mnt);
50 if (IS_ERR(proc_mnt)) {
51 unregister_filesystem(&proc_fs_type);
52 return;
53 }
54 proc_misc_init();
55 proc_net = proc_mkdir("net", NULL);
56 proc_net_stat = proc_mkdir("net/stat", NULL);
57
58#ifdef CONFIG_SYSVIPC
59 proc_mkdir("sysvipc", NULL);
60#endif
61#ifdef CONFIG_SYSCTL
62 proc_sys_root = proc_mkdir("sys", NULL);
63#endif
64#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
65 proc_mkdir("sys/fs", NULL);
66 proc_mkdir("sys/fs/binfmt_misc", NULL);
67#endif
68 proc_root_fs = proc_mkdir("fs", NULL);
69 proc_root_driver = proc_mkdir("driver", NULL);
70 proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
71#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
72 /* just give it a mountpoint */
73 proc_mkdir("openprom", NULL);
74#endif
75 proc_tty_init();
76#ifdef CONFIG_PROC_DEVICETREE
77 proc_device_tree_init();
78#endif
79 proc_bus = proc_mkdir("bus", NULL);
80}
81
82static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
83{
84 /*
85 * nr_threads is actually protected by the tasklist_lock;
86 * however, it's conventional to do reads, especially for
87 * reporting, without any locking whatsoever.
88 */
89 if (dir->i_ino == PROC_ROOT_INO) /* check for safety... */
90 dir->i_nlink = proc_root.nlink + nr_threads;
91
92 if (!proc_lookup(dir, dentry, nd)) {
93 return NULL;
94 }
95
96 return proc_pid_lookup(dir, dentry, nd);
97}
98
99static int proc_root_readdir(struct file * filp,
100 void * dirent, filldir_t filldir)
101{
102 unsigned int nr = filp->f_pos;
103 int ret;
104
105 lock_kernel();
106
107 if (nr < FIRST_PROCESS_ENTRY) {
108 int error = proc_readdir(filp, dirent, filldir);
109 if (error <= 0) {
110 unlock_kernel();
111 return error;
112 }
113 filp->f_pos = FIRST_PROCESS_ENTRY;
114 }
115 unlock_kernel();
116
117 ret = proc_pid_readdir(filp, dirent, filldir);
118 return ret;
119}
120
121/*
122 * The root /proc directory is special, as it has the
123 * <pid> directories. Thus we don't use the generic
124 * directory handling functions for that..
125 */
126static struct file_operations proc_root_operations = {
127 .read = generic_read_dir,
128 .readdir = proc_root_readdir,
129};
130
131/*
132 * proc root can do almost nothing..
133 */
134static struct inode_operations proc_root_inode_operations = {
135 .lookup = proc_root_lookup,
136};
137
138/*
139 * This is the root "inode" in the /proc tree..
140 */
141struct proc_dir_entry proc_root = {
142 .low_ino = PROC_ROOT_INO,
143 .namelen = 5,
144 .name = "/proc",
145 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
146 .nlink = 2,
147 .proc_iops = &proc_root_inode_operations,
148 .proc_fops = &proc_root_operations,
149 .parent = &proc_root,
150};
151
152EXPORT_SYMBOL(proc_symlink);
153EXPORT_SYMBOL(proc_mkdir);
154EXPORT_SYMBOL(create_proc_entry);
155EXPORT_SYMBOL(remove_proc_entry);
156EXPORT_SYMBOL(proc_root);
157EXPORT_SYMBOL(proc_root_fs);
158EXPORT_SYMBOL(proc_net);
159EXPORT_SYMBOL(proc_net_stat);
160EXPORT_SYMBOL(proc_bus);
161EXPORT_SYMBOL(proc_root_driver);