Commit | Line | Data |
---|---|---|
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> | |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/smp_lock.h> | |
f6c7a1f3 | 19 | #include <linux/mount.h> |
1da177e4 | 20 | |
fee781e6 AB |
21 | #include "internal.h" |
22 | ||
1da177e4 LT |
23 | struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver; |
24 | ||
25 | #ifdef CONFIG_SYSCTL | |
26 | struct proc_dir_entry *proc_sys_root; | |
27 | #endif | |
28 | ||
454e2398 DH |
29 | static int proc_get_sb(struct file_system_type *fs_type, |
30 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 31 | { |
f6c7a1f3 EB |
32 | if (proc_mnt) { |
33 | /* Seed the root directory with a pid so it doesn't need | |
34 | * to be special in base.c. I would do this earlier but | |
35 | * the only task alive when /proc is mounted the first time | |
36 | * is the init_task and it doesn't have any pids. | |
37 | */ | |
38 | struct proc_inode *ei; | |
39 | ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode); | |
40 | if (!ei->pid) | |
41 | ei->pid = find_get_pid(1); | |
42 | } | |
454e2398 | 43 | return get_sb_single(fs_type, flags, data, proc_fill_super, mnt); |
1da177e4 LT |
44 | } |
45 | ||
46 | static struct file_system_type proc_fs_type = { | |
47 | .name = "proc", | |
48 | .get_sb = proc_get_sb, | |
49 | .kill_sb = kill_anon_super, | |
50 | }; | |
51 | ||
1da177e4 LT |
52 | void __init proc_root_init(void) |
53 | { | |
54 | int err = proc_init_inodecache(); | |
55 | if (err) | |
56 | return; | |
57 | err = register_filesystem(&proc_fs_type); | |
58 | if (err) | |
59 | return; | |
60 | proc_mnt = kern_mount(&proc_fs_type); | |
61 | err = PTR_ERR(proc_mnt); | |
62 | if (IS_ERR(proc_mnt)) { | |
63 | unregister_filesystem(&proc_fs_type); | |
64 | return; | |
65 | } | |
66 | proc_misc_init(); | |
67 | proc_net = proc_mkdir("net", NULL); | |
68 | proc_net_stat = proc_mkdir("net/stat", NULL); | |
69 | ||
70 | #ifdef CONFIG_SYSVIPC | |
71 | proc_mkdir("sysvipc", NULL); | |
72 | #endif | |
73 | #ifdef CONFIG_SYSCTL | |
74 | proc_sys_root = proc_mkdir("sys", NULL); | |
75 | #endif | |
76 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) | |
77 | proc_mkdir("sys/fs", NULL); | |
78 | proc_mkdir("sys/fs/binfmt_misc", NULL); | |
79 | #endif | |
80 | proc_root_fs = proc_mkdir("fs", NULL); | |
81 | proc_root_driver = proc_mkdir("driver", NULL); | |
82 | proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */ | |
83 | #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) | |
84 | /* just give it a mountpoint */ | |
85 | proc_mkdir("openprom", NULL); | |
86 | #endif | |
87 | proc_tty_init(); | |
88 | #ifdef CONFIG_PROC_DEVICETREE | |
89 | proc_device_tree_init(); | |
90 | #endif | |
91 | proc_bus = proc_mkdir("bus", NULL); | |
92 | } | |
93 | ||
76b6159b AV |
94 | static int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat |
95 | ) | |
1da177e4 | 96 | { |
76b6159b AV |
97 | generic_fillattr(dentry->d_inode, stat); |
98 | stat->nlink = proc_root.nlink + nr_processes(); | |
99 | return 0; | |
100 | } | |
1da177e4 | 101 | |
76b6159b AV |
102 | static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd) |
103 | { | |
1da177e4 LT |
104 | if (!proc_lookup(dir, dentry, nd)) { |
105 | return NULL; | |
106 | } | |
107 | ||
108 | return proc_pid_lookup(dir, dentry, nd); | |
109 | } | |
110 | ||
111 | static int proc_root_readdir(struct file * filp, | |
112 | void * dirent, filldir_t filldir) | |
113 | { | |
114 | unsigned int nr = filp->f_pos; | |
115 | int ret; | |
116 | ||
117 | lock_kernel(); | |
118 | ||
119 | if (nr < FIRST_PROCESS_ENTRY) { | |
120 | int error = proc_readdir(filp, dirent, filldir); | |
121 | if (error <= 0) { | |
122 | unlock_kernel(); | |
123 | return error; | |
124 | } | |
125 | filp->f_pos = FIRST_PROCESS_ENTRY; | |
126 | } | |
127 | unlock_kernel(); | |
128 | ||
129 | ret = proc_pid_readdir(filp, dirent, filldir); | |
130 | return ret; | |
131 | } | |
132 | ||
133 | /* | |
134 | * The root /proc directory is special, as it has the | |
135 | * <pid> directories. Thus we don't use the generic | |
136 | * directory handling functions for that.. | |
137 | */ | |
138 | static struct file_operations proc_root_operations = { | |
139 | .read = generic_read_dir, | |
140 | .readdir = proc_root_readdir, | |
141 | }; | |
142 | ||
143 | /* | |
144 | * proc root can do almost nothing.. | |
145 | */ | |
146 | static struct inode_operations proc_root_inode_operations = { | |
147 | .lookup = proc_root_lookup, | |
76b6159b | 148 | .getattr = proc_root_getattr, |
1da177e4 LT |
149 | }; |
150 | ||
151 | /* | |
152 | * This is the root "inode" in the /proc tree.. | |
153 | */ | |
154 | struct proc_dir_entry proc_root = { | |
155 | .low_ino = PROC_ROOT_INO, | |
156 | .namelen = 5, | |
157 | .name = "/proc", | |
158 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
159 | .nlink = 2, | |
160 | .proc_iops = &proc_root_inode_operations, | |
161 | .proc_fops = &proc_root_operations, | |
162 | .parent = &proc_root, | |
163 | }; | |
164 | ||
165 | EXPORT_SYMBOL(proc_symlink); | |
166 | EXPORT_SYMBOL(proc_mkdir); | |
167 | EXPORT_SYMBOL(create_proc_entry); | |
168 | EXPORT_SYMBOL(remove_proc_entry); | |
169 | EXPORT_SYMBOL(proc_root); | |
170 | EXPORT_SYMBOL(proc_root_fs); | |
171 | EXPORT_SYMBOL(proc_net); | |
172 | EXPORT_SYMBOL(proc_net_stat); | |
173 | EXPORT_SYMBOL(proc_bus); | |
174 | EXPORT_SYMBOL(proc_root_driver); |