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 <linux/bitops.h>
19 #include <linux/smp_lock.h>
23 struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
26 struct proc_dir_entry *proc_sys_root;
29 static struct super_block *proc_get_sb(struct file_system_type *fs_type,
30 int flags, const char *dev_name, void *data)
32 return get_sb_single(fs_type, flags, data, proc_fill_super);
35 static struct file_system_type proc_fs_type = {
37 .get_sb = proc_get_sb,
38 .kill_sb = kill_anon_super,
41 void __init proc_root_init(void)
43 int err = proc_init_inodecache();
46 err = register_filesystem(&proc_fs_type);
49 proc_mnt = kern_mount(&proc_fs_type);
50 err = PTR_ERR(proc_mnt);
51 if (IS_ERR(proc_mnt)) {
52 unregister_filesystem(&proc_fs_type);
56 proc_net = proc_mkdir("net", NULL);
57 proc_net_stat = proc_mkdir("net/stat", NULL);
60 proc_mkdir("sysvipc", NULL);
63 proc_sys_root = proc_mkdir("sys", NULL);
65 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
66 proc_mkdir("sys/fs", NULL);
67 proc_mkdir("sys/fs/binfmt_misc", NULL);
69 proc_root_fs = proc_mkdir("fs", NULL);
70 proc_root_driver = proc_mkdir("driver", NULL);
71 proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
72 #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
73 /* just give it a mountpoint */
74 proc_mkdir("openprom", NULL);
77 #ifdef CONFIG_PROC_DEVICETREE
78 proc_device_tree_init();
80 proc_bus = proc_mkdir("bus", NULL);
83 static int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat
86 generic_fillattr(dentry->d_inode, stat);
87 stat->nlink = proc_root.nlink + nr_processes();
91 static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
93 if (!proc_lookup(dir, dentry, nd)) {
97 return proc_pid_lookup(dir, dentry, nd);
100 static int proc_root_readdir(struct file * filp,
101 void * dirent, filldir_t filldir)
103 unsigned int nr = filp->f_pos;
108 if (nr < FIRST_PROCESS_ENTRY) {
109 int error = proc_readdir(filp, dirent, filldir);
114 filp->f_pos = FIRST_PROCESS_ENTRY;
118 ret = proc_pid_readdir(filp, dirent, filldir);
123 * The root /proc directory is special, as it has the
124 * <pid> directories. Thus we don't use the generic
125 * directory handling functions for that..
127 static struct file_operations proc_root_operations = {
128 .read = generic_read_dir,
129 .readdir = proc_root_readdir,
133 * proc root can do almost nothing..
135 static struct inode_operations proc_root_inode_operations = {
136 .lookup = proc_root_lookup,
137 .getattr = proc_root_getattr,
141 * This is the root "inode" in the /proc tree..
143 struct proc_dir_entry proc_root = {
144 .low_ino = PROC_ROOT_INO,
147 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
149 .proc_iops = &proc_root_inode_operations,
150 .proc_fops = &proc_root_operations,
151 .parent = &proc_root,
154 EXPORT_SYMBOL(proc_symlink);
155 EXPORT_SYMBOL(proc_mkdir);
156 EXPORT_SYMBOL(create_proc_entry);
157 EXPORT_SYMBOL(remove_proc_entry);
158 EXPORT_SYMBOL(proc_root);
159 EXPORT_SYMBOL(proc_root_fs);
160 EXPORT_SYMBOL(proc_net);
161 EXPORT_SYMBOL(proc_net_stat);
162 EXPORT_SYMBOL(proc_bus);
163 EXPORT_SYMBOL(proc_root_driver);