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 #include "internal.h" 22 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 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 int proc_root_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat 84 ) 85 { 86 generic_fillattr(dentry->d_inode, stat); 87 stat->nlink = proc_root.nlink + nr_processes(); 88 return 0; 89 } 90 91 static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd) 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 .getattr = proc_root_getattr, 138 }; 139 140 /* 141 * This is the root "inode" in the /proc tree.. 142 */ 143 struct proc_dir_entry proc_root = { 144 .low_ino = PROC_ROOT_INO, 145 .namelen = 5, 146 .name = "/proc", 147 .mode = S_IFDIR | S_IRUGO | S_IXUGO, 148 .nlink = 2, 149 .proc_iops = &proc_root_inode_operations, 150 .proc_fops = &proc_root_operations, 151 .parent = &proc_root, 152 }; 153 154 EXPORT_SYMBOL(proc_symlink); 155 EXPORT_SYMBOL(proc_mkdir); 156 EXPORT_SYMBOL(create_proc_entry); 157 EXPORT_SYMBOL(remove_proc_entry); 158 EXPORT_SYMBOL(proc_root); 159 EXPORT_SYMBOL(proc_root_fs); 160 EXPORT_SYMBOL(proc_net); 161 EXPORT_SYMBOL(proc_net_stat); 162 EXPORT_SYMBOL(proc_bus); 163 EXPORT_SYMBOL(proc_root_driver); 164