Commit | Line | Data |
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1da177e4 LT |
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 | ||
21 | struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver; | |
22 | ||
23 | #ifdef CONFIG_SYSCTL | |
24 | struct proc_dir_entry *proc_sys_root; | |
25 | #endif | |
26 | ||
27 | static 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 | ||
33 | static struct file_system_type proc_fs_type = { | |
34 | .name = "proc", | |
35 | .get_sb = proc_get_sb, | |
36 | .kill_sb = kill_anon_super, | |
37 | }; | |
38 | ||
39 | extern int __init proc_init_inodecache(void); | |
40 | void __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 | ||
82 | static 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 | ||
99 | static 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 | */ | |
126 | static 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 | */ | |
134 | static 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 | */ | |
141 | struct 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 | ||
152 | EXPORT_SYMBOL(proc_symlink); | |
153 | EXPORT_SYMBOL(proc_mkdir); | |
154 | EXPORT_SYMBOL(create_proc_entry); | |
155 | EXPORT_SYMBOL(remove_proc_entry); | |
156 | EXPORT_SYMBOL(proc_root); | |
157 | EXPORT_SYMBOL(proc_root_fs); | |
158 | EXPORT_SYMBOL(proc_net); | |
159 | EXPORT_SYMBOL(proc_net_stat); | |
160 | EXPORT_SYMBOL(proc_bus); | |
161 | EXPORT_SYMBOL(proc_root_driver); |