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/init.h>
16 #include <linux/sched.h>
17 #include <linux/module.h>
18 #include <linux/bitops.h>
19 #include <linux/smp_lock.h>
20 #include <linux/mount.h>
24 struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
27 struct proc_dir_entry *proc_sys_root;
29 struct proc_dir_entry *proc_virtual;
31 extern void proc_vx_init(void);
33 static int proc_get_sb(struct file_system_type *fs_type,
34 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
37 /* Seed the root directory with a pid so it doesn't need
38 * to be special in base.c. I would do this earlier but
39 * the only task alive when /proc is mounted the first time
40 * is the init_task and it doesn't have any pids.
42 struct proc_inode *ei;
43 ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode);
45 ei->pid = find_get_pid(1);
47 return get_sb_single(fs_type, flags, data, proc_fill_super, mnt);
50 static struct file_system_type proc_fs_type = {
52 .get_sb = proc_get_sb,
53 .kill_sb = kill_anon_super,
56 void __init proc_root_init(void)
58 int err = proc_init_inodecache();
61 err = register_filesystem(&proc_fs_type);
64 proc_mnt = kern_mount(&proc_fs_type);
65 err = PTR_ERR(proc_mnt);
66 if (IS_ERR(proc_mnt)) {
67 unregister_filesystem(&proc_fs_type);
71 proc_net = proc_mkdir("net", NULL);
72 proc_net_stat = proc_mkdir("net/stat", NULL);
75 proc_mkdir("sysvipc", NULL);
78 proc_sys_root = proc_mkdir("sys", NULL);
80 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
81 proc_mkdir("sys/fs", NULL);
82 proc_mkdir("sys/fs/binfmt_misc", NULL);
84 proc_root_fs = proc_mkdir("fs", NULL);
85 proc_root_driver = proc_mkdir("driver", NULL);
86 proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
87 #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
88 /* just give it a mountpoint */
89 proc_mkdir("openprom", NULL);
92 #ifdef CONFIG_PROC_DEVICETREE
93 proc_device_tree_init();
95 proc_bus = proc_mkdir("bus", NULL);
99 static int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat
102 generic_fillattr(dentry->d_inode, stat);
103 stat->nlink = proc_root.nlink + nr_processes();
107 static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
109 if (!proc_lookup(dir, dentry, nd)) {
113 return proc_pid_lookup(dir, dentry, nd);
116 static int proc_root_readdir(struct file * filp,
117 void * dirent, filldir_t filldir)
119 unsigned int nr = filp->f_pos;
124 if (nr < FIRST_PROCESS_ENTRY) {
125 int error = proc_readdir(filp, dirent, filldir);
130 filp->f_pos = FIRST_PROCESS_ENTRY;
134 ret = proc_pid_readdir(filp, dirent, filldir);
139 * The root /proc directory is special, as it has the
140 * <pid> directories. Thus we don't use the generic
141 * directory handling functions for that..
143 static struct file_operations proc_root_operations = {
144 .read = generic_read_dir,
145 .readdir = proc_root_readdir,
149 * proc root can do almost nothing..
151 static struct inode_operations proc_root_inode_operations = {
152 .lookup = proc_root_lookup,
153 .getattr = proc_root_getattr,
157 * This is the root "inode" in the /proc tree..
159 struct proc_dir_entry proc_root = {
160 .low_ino = PROC_ROOT_INO,
163 .mode = S_IFDIR | S_IRUGO | S_IXUGO,
165 .proc_iops = &proc_root_inode_operations,
166 .proc_fops = &proc_root_operations,
167 .parent = &proc_root,
170 EXPORT_SYMBOL(proc_symlink);
171 EXPORT_SYMBOL(proc_mkdir);
172 EXPORT_SYMBOL(create_proc_entry);
173 EXPORT_SYMBOL(remove_proc_entry);
174 EXPORT_SYMBOL(proc_root);
175 EXPORT_SYMBOL(proc_root_fs);
176 EXPORT_SYMBOL(proc_net);
177 EXPORT_SYMBOL(proc_net_stat);
178 EXPORT_SYMBOL(proc_bus);
179 EXPORT_SYMBOL(proc_root_driver);