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 | 15 | #include <linux/init.h> |
914e2637 | 16 | #include <linux/sched.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/bitops.h> | |
19 | #include <linux/smp_lock.h> | |
f6c7a1f3 | 20 | #include <linux/mount.h> |
1da177e4 | 21 | |
fee781e6 AB |
22 | #include "internal.h" |
23 | ||
1da177e4 LT |
24 | struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver; |
25 | ||
454e2398 DH |
26 | static int proc_get_sb(struct file_system_type *fs_type, |
27 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 28 | { |
f6c7a1f3 EB |
29 | if (proc_mnt) { |
30 | /* Seed the root directory with a pid so it doesn't need | |
31 | * to be special in base.c. I would do this earlier but | |
32 | * the only task alive when /proc is mounted the first time | |
33 | * is the init_task and it doesn't have any pids. | |
34 | */ | |
35 | struct proc_inode *ei; | |
36 | ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode); | |
37 | if (!ei->pid) | |
38 | ei->pid = find_get_pid(1); | |
39 | } | |
454e2398 | 40 | return get_sb_single(fs_type, flags, data, proc_fill_super, mnt); |
1da177e4 LT |
41 | } |
42 | ||
43 | static struct file_system_type proc_fs_type = { | |
44 | .name = "proc", | |
45 | .get_sb = proc_get_sb, | |
46 | .kill_sb = kill_anon_super, | |
47 | }; | |
48 | ||
1da177e4 LT |
49 | void __init proc_root_init(void) |
50 | { | |
51 | int err = proc_init_inodecache(); | |
52 | if (err) | |
53 | return; | |
54 | err = register_filesystem(&proc_fs_type); | |
55 | if (err) | |
56 | return; | |
57 | proc_mnt = kern_mount(&proc_fs_type); | |
58 | err = PTR_ERR(proc_mnt); | |
59 | if (IS_ERR(proc_mnt)) { | |
60 | unregister_filesystem(&proc_fs_type); | |
61 | return; | |
62 | } | |
63 | proc_misc_init(); | |
64 | proc_net = proc_mkdir("net", NULL); | |
65 | proc_net_stat = proc_mkdir("net/stat", NULL); | |
66 | ||
67 | #ifdef CONFIG_SYSVIPC | |
68 | proc_mkdir("sysvipc", NULL); | |
1da177e4 LT |
69 | #endif |
70 | proc_root_fs = proc_mkdir("fs", NULL); | |
71 | proc_root_driver = proc_mkdir("driver", NULL); | |
72 | proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */ | |
73 | #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) | |
74 | /* just give it a mountpoint */ | |
75 | proc_mkdir("openprom", NULL); | |
76 | #endif | |
77 | proc_tty_init(); | |
78 | #ifdef CONFIG_PROC_DEVICETREE | |
79 | proc_device_tree_init(); | |
80 | #endif | |
81 | proc_bus = proc_mkdir("bus", NULL); | |
77b14db5 | 82 | proc_sys_init(); |
1da177e4 LT |
83 | } |
84 | ||
76b6159b AV |
85 | static int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat |
86 | ) | |
1da177e4 | 87 | { |
76b6159b AV |
88 | generic_fillattr(dentry->d_inode, stat); |
89 | stat->nlink = proc_root.nlink + nr_processes(); | |
90 | return 0; | |
91 | } | |
1da177e4 | 92 | |
76b6159b AV |
93 | static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd) |
94 | { | |
1da177e4 LT |
95 | if (!proc_lookup(dir, dentry, nd)) { |
96 | return NULL; | |
97 | } | |
98 | ||
99 | return proc_pid_lookup(dir, dentry, nd); | |
100 | } | |
101 | ||
102 | static int proc_root_readdir(struct file * filp, | |
103 | void * dirent, filldir_t filldir) | |
104 | { | |
105 | unsigned int nr = filp->f_pos; | |
106 | int ret; | |
107 | ||
108 | lock_kernel(); | |
109 | ||
110 | if (nr < FIRST_PROCESS_ENTRY) { | |
111 | int error = proc_readdir(filp, dirent, filldir); | |
112 | if (error <= 0) { | |
113 | unlock_kernel(); | |
114 | return error; | |
115 | } | |
116 | filp->f_pos = FIRST_PROCESS_ENTRY; | |
117 | } | |
118 | unlock_kernel(); | |
119 | ||
120 | ret = proc_pid_readdir(filp, dirent, filldir); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | /* | |
125 | * The root /proc directory is special, as it has the | |
126 | * <pid> directories. Thus we don't use the generic | |
127 | * directory handling functions for that.. | |
128 | */ | |
00977a59 | 129 | static const struct file_operations proc_root_operations = { |
1da177e4 LT |
130 | .read = generic_read_dir, |
131 | .readdir = proc_root_readdir, | |
132 | }; | |
133 | ||
134 | /* | |
135 | * proc root can do almost nothing.. | |
136 | */ | |
c5ef1c42 | 137 | static const struct inode_operations proc_root_inode_operations = { |
1da177e4 | 138 | .lookup = proc_root_lookup, |
76b6159b | 139 | .getattr = proc_root_getattr, |
1da177e4 LT |
140 | }; |
141 | ||
142 | /* | |
143 | * This is the root "inode" in the /proc tree.. | |
144 | */ | |
145 | struct proc_dir_entry proc_root = { | |
146 | .low_ino = PROC_ROOT_INO, | |
147 | .namelen = 5, | |
148 | .name = "/proc", | |
149 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, | |
150 | .nlink = 2, | |
151 | .proc_iops = &proc_root_inode_operations, | |
152 | .proc_fops = &proc_root_operations, | |
153 | .parent = &proc_root, | |
154 | }; | |
155 | ||
156 | EXPORT_SYMBOL(proc_symlink); | |
157 | EXPORT_SYMBOL(proc_mkdir); | |
158 | EXPORT_SYMBOL(create_proc_entry); | |
159 | EXPORT_SYMBOL(remove_proc_entry); | |
160 | EXPORT_SYMBOL(proc_root); | |
161 | EXPORT_SYMBOL(proc_root_fs); | |
162 | EXPORT_SYMBOL(proc_net); | |
163 | EXPORT_SYMBOL(proc_net_stat); | |
164 | EXPORT_SYMBOL(proc_bus); | |
165 | EXPORT_SYMBOL(proc_root_driver); |