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/*

 *  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/sched.h>

#include <linux/proc_fs.h>

#include <linux/stat.h>

#include <linux/config.h>

#include <linux/init.h>

#include <linux/module.h>

#include <asm/bitops.h>

struct proc_dir_entry *proc_net, *proc_bus, *proc_root_fs, *proc_root_driver;

#ifdef CONFIG_SYSCTL

struct proc_dir_entry *proc_sys_root;

#endif

static DECLARE_FSTYPE(proc_fs_type, "proc", proc_read_super, FS_SINGLE);

void __init proc_root_init(void)

{

        int 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", 0);

#ifdef CONFIG_SYSVIPC

        proc_mkdir("sysvipc", 0);

#endif

#ifdef CONFIG_SYSCTL

        proc_sys_root = proc_mkdir("sys", 0);

#endif

#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)

        proc_mkdir("sys/fs", 0);

        proc_mkdir("sys/fs/binfmt_misc", 0);

#endif

        proc_root_fs = proc_mkdir("fs", 0);

        proc_root_driver = proc_mkdir("driver", 0);

#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)

        /* just give it a mountpoint */

        proc_mkdir("openprom", 0);

#endif

        proc_tty_init();

#ifdef CONFIG_PROC_DEVICETREE

        proc_device_tree_init();

#endif

#ifdef CONFIG_PPC_ISERIES

        iSeries_proc_create();

#endif

#ifdef CONFIG_PPC64

        proc_ppc64_init();

#endif

#ifdef CONFIG_PPC_RTAS

        proc_rtas_init();

#endif

        proc_bus = proc_mkdir("bus", 0);

}

static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry)

{

        if (dir->i_ino == PROC_ROOT_INO) { /* check for safety... */

                int nlink = proc_root.nlink;

                nlink += nr_threads;

                dir->i_nlink = nlink;

        }

        if (!proc_lookup(dir, dentry))

                return NULL;

        return proc_pid_lookup(dir, dentry);

}

static int proc_root_readdir(struct file * filp,

        void * dirent, filldir_t filldir)

{

        unsigned int nr = filp->f_pos;

        if (nr < FIRST_PROCESS_ENTRY) {

                int error = proc_readdir(filp, dirent, filldir);

                if (error <= 0)

                        return error;

                filp->f_pos = FIRST_PROCESS_ENTRY;

        }

        return proc_pid_readdir(filp, dirent, filldir);

}

/*

 * 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,

};

#ifdef CONFIG_SYSCTL

EXPORT_SYMBOL(proc_sys_root);

#endif

EXPORT_SYMBOL(proc_symlink);

EXPORT_SYMBOL(proc_mknod);

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_bus);

EXPORT_SYMBOL(proc_root_driver);