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/module.h>
17 #include <linux/bitops.h>
18 #include <linux/smp_lock.h>
22 struct proc_dir_entry
*proc_net
, *proc_net_stat
, *proc_bus
, *proc_root_fs
, *proc_root_driver
;
25 struct proc_dir_entry
*proc_sys_root
;
28 static int proc_get_sb(struct file_system_type
*fs_type
,
29 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
31 return get_sb_single(fs_type
, flags
, data
, proc_fill_super
, mnt
);
34 static struct file_system_type proc_fs_type
= {
36 .get_sb
= proc_get_sb
,
37 .kill_sb
= kill_anon_super
,
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", NULL
);
56 proc_net_stat
= proc_mkdir("net/stat", NULL
);
59 proc_mkdir("sysvipc", NULL
);
62 proc_sys_root
= proc_mkdir("sys", NULL
);
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
);
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
);
76 #ifdef CONFIG_PROC_DEVICETREE
77 proc_device_tree_init();
79 proc_bus
= proc_mkdir("bus", NULL
);
82 static int proc_root_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
85 generic_fillattr(dentry
->d_inode
, stat
);
86 stat
->nlink
= proc_root
.nlink
+ nr_processes();
90 static struct dentry
*proc_root_lookup(struct inode
* dir
, struct dentry
* dentry
, struct nameidata
*nd
)
92 if (!proc_lookup(dir
, dentry
, nd
)) {
96 return proc_pid_lookup(dir
, dentry
, nd
);
99 static int proc_root_readdir(struct file
* filp
,
100 void * dirent
, filldir_t filldir
)
102 unsigned int nr
= filp
->f_pos
;
107 if (nr
< FIRST_PROCESS_ENTRY
) {
108 int error
= proc_readdir(filp
, dirent
, filldir
);
113 filp
->f_pos
= FIRST_PROCESS_ENTRY
;
117 ret
= proc_pid_readdir(filp
, dirent
, filldir
);
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..
126 static struct file_operations proc_root_operations
= {
127 .read
= generic_read_dir
,
128 .readdir
= proc_root_readdir
,
132 * proc root can do almost nothing..
134 static struct inode_operations proc_root_inode_operations
= {
135 .lookup
= proc_root_lookup
,
136 .getattr
= proc_root_getattr
,
140 * This is the root "inode" in the /proc tree..
142 struct proc_dir_entry proc_root
= {
143 .low_ino
= PROC_ROOT_INO
,
146 .mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
,
148 .proc_iops
= &proc_root_inode_operations
,
149 .proc_fops
= &proc_root_operations
,
150 .parent
= &proc_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_net_stat
);
161 EXPORT_SYMBOL(proc_bus
);
162 EXPORT_SYMBOL(proc_root_driver
);