Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Adrian Bunk | fee781e | 2006-01-08 01:04:16 -0800 | [diff] [blame^] | 21 | #include "internal.h" |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 29 | static struct super_block *proc_get_sb(struct file_system_type *fs_type, |
| 30 | int flags, const char *dev_name, void *data) |
| 31 | { |
| 32 | return get_sb_single(fs_type, flags, data, proc_fill_super); |
| 33 | } |
| 34 | |
| 35 | static struct file_system_type proc_fs_type = { |
| 36 | .name = "proc", |
| 37 | .get_sb = proc_get_sb, |
| 38 | .kill_sb = kill_anon_super, |
| 39 | }; |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | void __init proc_root_init(void) |
| 42 | { |
| 43 | int err = proc_init_inodecache(); |
| 44 | if (err) |
| 45 | return; |
| 46 | err = register_filesystem(&proc_fs_type); |
| 47 | if (err) |
| 48 | return; |
| 49 | proc_mnt = kern_mount(&proc_fs_type); |
| 50 | err = PTR_ERR(proc_mnt); |
| 51 | if (IS_ERR(proc_mnt)) { |
| 52 | unregister_filesystem(&proc_fs_type); |
| 53 | return; |
| 54 | } |
| 55 | proc_misc_init(); |
| 56 | proc_net = proc_mkdir("net", NULL); |
| 57 | proc_net_stat = proc_mkdir("net/stat", NULL); |
| 58 | |
| 59 | #ifdef CONFIG_SYSVIPC |
| 60 | proc_mkdir("sysvipc", NULL); |
| 61 | #endif |
| 62 | #ifdef CONFIG_SYSCTL |
| 63 | proc_sys_root = proc_mkdir("sys", NULL); |
| 64 | #endif |
| 65 | #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
| 66 | proc_mkdir("sys/fs", NULL); |
| 67 | proc_mkdir("sys/fs/binfmt_misc", NULL); |
| 68 | #endif |
| 69 | proc_root_fs = proc_mkdir("fs", NULL); |
| 70 | proc_root_driver = proc_mkdir("driver", NULL); |
| 71 | proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */ |
| 72 | #if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE) |
| 73 | /* just give it a mountpoint */ |
| 74 | proc_mkdir("openprom", NULL); |
| 75 | #endif |
| 76 | proc_tty_init(); |
| 77 | #ifdef CONFIG_PROC_DEVICETREE |
| 78 | proc_device_tree_init(); |
| 79 | #endif |
| 80 | proc_bus = proc_mkdir("bus", NULL); |
| 81 | } |
| 82 | |
| 83 | static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd) |
| 84 | { |
| 85 | /* |
| 86 | * nr_threads is actually protected by the tasklist_lock; |
| 87 | * however, it's conventional to do reads, especially for |
| 88 | * reporting, without any locking whatsoever. |
| 89 | */ |
| 90 | if (dir->i_ino == PROC_ROOT_INO) /* check for safety... */ |
| 91 | dir->i_nlink = proc_root.nlink + nr_threads; |
| 92 | |
| 93 | if (!proc_lookup(dir, dentry, nd)) { |
| 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | return proc_pid_lookup(dir, dentry, nd); |
| 98 | } |
| 99 | |
| 100 | static int proc_root_readdir(struct file * filp, |
| 101 | void * dirent, filldir_t filldir) |
| 102 | { |
| 103 | unsigned int nr = filp->f_pos; |
| 104 | int ret; |
| 105 | |
| 106 | lock_kernel(); |
| 107 | |
| 108 | if (nr < FIRST_PROCESS_ENTRY) { |
| 109 | int error = proc_readdir(filp, dirent, filldir); |
| 110 | if (error <= 0) { |
| 111 | unlock_kernel(); |
| 112 | return error; |
| 113 | } |
| 114 | filp->f_pos = FIRST_PROCESS_ENTRY; |
| 115 | } |
| 116 | unlock_kernel(); |
| 117 | |
| 118 | ret = proc_pid_readdir(filp, dirent, filldir); |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * The root /proc directory is special, as it has the |
| 124 | * <pid> directories. Thus we don't use the generic |
| 125 | * directory handling functions for that.. |
| 126 | */ |
| 127 | static struct file_operations proc_root_operations = { |
| 128 | .read = generic_read_dir, |
| 129 | .readdir = proc_root_readdir, |
| 130 | }; |
| 131 | |
| 132 | /* |
| 133 | * proc root can do almost nothing.. |
| 134 | */ |
| 135 | static struct inode_operations proc_root_inode_operations = { |
| 136 | .lookup = proc_root_lookup, |
| 137 | }; |
| 138 | |
| 139 | /* |
| 140 | * This is the root "inode" in the /proc tree.. |
| 141 | */ |
| 142 | struct proc_dir_entry proc_root = { |
| 143 | .low_ino = PROC_ROOT_INO, |
| 144 | .namelen = 5, |
| 145 | .name = "/proc", |
| 146 | .mode = S_IFDIR | S_IRUGO | S_IXUGO, |
| 147 | .nlink = 2, |
| 148 | .proc_iops = &proc_root_inode_operations, |
| 149 | .proc_fops = &proc_root_operations, |
| 150 | .parent = &proc_root, |
| 151 | }; |
| 152 | |
| 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); |