4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc root directory handling functions
9 #include <asm/uaccess.h>
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 <asm/bitops.h>
19 #include <linux/smp_lock.h>
21 struct proc_dir_entry *proc_net, *proc_bus, *proc_root_fs, *proc_root_driver;
24 struct proc_dir_entry *proc_sys_root;
27 static struct super_block *proc_get_sb(struct file_system_type *fs_type,
28 int flags, const char *dev_name, void *data)
30 return get_sb_single(fs_type, flags, data, proc_fill_super);
33 static struct file_system_type proc_fs_type = {
35 .get_sb = proc_get_sb,
36 .kill_sb = kill_anon_super,
39 extern int __init proc_init_inodecache(void);
40 void __init proc_root_init(void)
42 int err = proc_init_inodecache();
45 err = register_filesystem(&proc_fs_type);
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);
55 proc_net = proc_mkdir("net", 0);
57 proc_mkdir("sysvipc", 0);
60 proc_sys_root = proc_mkdir("sys", 0);
62 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
63 proc_mkdir("sys/fs", 0);
64 proc_mkdir("sys/fs/binfmt_misc", 0);
66 proc_root_fs = proc_mkdir("fs", 0);
67 proc_root_driver = proc_mkdir("driver", 0);
68 proc_mkdir("fs/nfsd", 0); /* somewhere for the nfsd filesystem to be mounted */
69 #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
70 /* just give it a mountpoint */
71 proc_mkdir("openprom", 0);
74 #ifdef CONFIG_PROC_DEVICETREE
75 proc_device_tree_init();
77 proc_bus = proc_mkdir("bus", 0);
80 static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
83 * nr_threads is actually protected by the tasklist_lock;
84 * however, it's conventional to do reads, especially for
85 * reporting, without any locking whatsoever.
87 if (dir->i_ino == PROC_ROOT_INO) /* check for safety... */
88 dir->i_nlink = proc_root.nlink + nr_threads;
90 if (!proc_lookup(dir, dentry, nd)) {
94 return proc_pid_lookup(dir, dentry, nd);
97 static int proc_root_readdir(struct file * filp,
98 void * dirent, filldir_t filldir)
100 unsigned int nr = filp->f_pos;
105 if (nr < FIRST_PROCESS_ENTRY) {
106 int error = proc_readdir(filp, dirent, filldir);
111 filp->f_pos = FIRST_PROCESS_ENTRY;
115 ret = proc_pid_readdir(filp, dirent, filldir);
120 * The root /proc directory is special, as it has the
121 * <pid> directories. Thus we don't use the generic
122 * directory handling functions for that..
124 static struct file_operations proc_root_operations = {
125 .read = generic_read_dir,
126 .readdir = proc_root_readdir,
130 * proc root can do almost nothing..
132 static struct inode_operations proc_root_inode_operations = {
133 .lookup = proc_root_lookup,
137 * This is the root "inode" in the /proc tree..
139 struct proc_dir_entry proc_root = {
140 .low_ino = PROC_ROOT_INO,
143 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
145 .proc_iops = &proc_root_inode_operations,
146 .proc_fops = &proc_root_operations,
147 .parent = &proc_root,
151 EXPORT_SYMBOL(proc_sys_root);
153 EXPORT_SYMBOL(proc_symlink);
154 EXPORT_SYMBOL(proc_mkdir);
155 EXPORT_SYMBOL(create_proc_entry);
156 EXPORT_SYMBOL(remove_proc_entry);
157 EXPORT_SYMBOL(proc_root);
158 EXPORT_SYMBOL(proc_root_fs);
159 EXPORT_SYMBOL(proc_net);
160 EXPORT_SYMBOL(proc_bus);
161 EXPORT_SYMBOL(proc_root_driver);