1 files changed, 161 insertions, 0 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c
new file mode 100644
index 000000000000..aef148f099a2
--- /dev/null
+++ b/fs/proc/root.c
@@ -0,0 +1,161 @@
+/*
+ *  linux/fs/proc/root.c
+ *
+ *  Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ *  proc root directory handling functions
+ */
+
+#include <asm/uaccess.h>
+
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/smp_lock.h>
+
+struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
+
+#ifdef CONFIG_SYSCTL
+struct proc_dir_entry *proc_sys_root;
+#endif
+
+static struct super_block *proc_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_single(fs_type, flags, data, proc_fill_super);
+}
+
+static struct file_system_type proc_fs_type = {
+	.name		= "proc",
+	.get_sb		= proc_get_sb,
+	.kill_sb	= kill_anon_super,
+};
+
+extern int __init proc_init_inodecache(void);
+void __init proc_root_init(void)
+{
+	int err = proc_init_inodecache();
+	if (err)
+		return;
+	err = register_filesystem(&proc_fs_type);
+	if (err)
+		return;
+	proc_mnt = kern_mount(&proc_fs_type);
+	err = PTR_ERR(proc_mnt);
+	if (IS_ERR(proc_mnt)) {
+		unregister_filesystem(&proc_fs_type);
+		return;
+	}
+	proc_misc_init();
+	proc_net = proc_mkdir("net", NULL);
+	proc_net_stat = proc_mkdir("net/stat", NULL);
+
+#ifdef CONFIG_SYSVIPC
+	proc_mkdir("sysvipc", NULL);
+#endif
+#ifdef CONFIG_SYSCTL
+	proc_sys_root = proc_mkdir("sys", NULL);
+#endif
+#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
+	proc_mkdir("sys/fs", NULL);
+	proc_mkdir("sys/fs/binfmt_misc", NULL);
+#endif
+	proc_root_fs = proc_mkdir("fs", NULL);
+	proc_root_driver = proc_mkdir("driver", NULL);
+	proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
+#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
+	/* just give it a mountpoint */
+	proc_mkdir("openprom", NULL);
+#endif
+	proc_tty_init();
+#ifdef CONFIG_PROC_DEVICETREE
+	proc_device_tree_init();
+#endif
+	proc_bus = proc_mkdir("bus", NULL);
+}
+
+static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
+{
+	/*
+	 * nr_threads is actually protected by the tasklist_lock;
+	 * however, it's conventional to do reads, especially for
+	 * reporting, without any locking whatsoever.
+	 */
+	if (dir->i_ino == PROC_ROOT_INO) /* check for safety... */
+		dir->i_nlink = proc_root.nlink + nr_threads;
+
+	if (!proc_lookup(dir, dentry, nd)) {
+		return NULL;
+	}
+	
+	return proc_pid_lookup(dir, dentry, nd);
+}
+
+static int proc_root_readdir(struct file * filp,
+	void * dirent, filldir_t filldir)
+{
+	unsigned int nr = filp->f_pos;
+	int ret;
+
+	lock_kernel();
+
+	if (nr < FIRST_PROCESS_ENTRY) {
+		int error = proc_readdir(filp, dirent, filldir);
+		if (error <= 0) {
+			unlock_kernel();
+			return error;
+		}
+		filp->f_pos = FIRST_PROCESS_ENTRY;
+	}
+	unlock_kernel();
+
+	ret = proc_pid_readdir(filp, dirent, filldir);
+	return ret;
+}
+
+/*
+ * The root /proc directory is special, as it has the
+ * <pid> directories. Thus we don't use the generic
+ * directory handling functions for that..
+ */
+static struct file_operations proc_root_operations = {
+	.read		 = generic_read_dir,
+	.readdir	 = proc_root_readdir,
+};
+
+/*
+ * proc root can do almost nothing..
+ */
+static struct inode_operations proc_root_inode_operations = {
+	.lookup		= proc_root_lookup,
+};
+
+/*
+ * This is the root "inode" in the /proc tree..
+ */
+struct proc_dir_entry proc_root = {
+	.low_ino	= PROC_ROOT_INO, 
+	.namelen	= 5, 
+	.name		= "/proc",
+	.mode		= S_IFDIR | S_IRUGO | S_IXUGO, 
+	.nlink		= 2, 
+	.proc_iops	= &proc_root_inode_operations, 
+	.proc_fops	= &proc_root_operations,
+	.parent		= &proc_root,
+};
+
+EXPORT_SYMBOL(proc_symlink);
+EXPORT_SYMBOL(proc_mkdir);
+EXPORT_SYMBOL(create_proc_entry);
+EXPORT_SYMBOL(remove_proc_entry);
+EXPORT_SYMBOL(proc_root);
+EXPORT_SYMBOL(proc_root_fs);
+EXPORT_SYMBOL(proc_net);
+EXPORT_SYMBOL(proc_net_stat);
+EXPORT_SYMBOL(proc_bus);
+EXPORT_SYMBOL(proc_root_driver);