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/*
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 * Project: HARTIK (HA-rd R-eal TI-me K-ernel)
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 *
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 * Coordinators: Giorgio Buttazzo <giorgio@sssup.it>
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 *               Gerardo Lamastra <gerardo@sssup.it>
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 *
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 * Authors     : Massimiliano Giorgi <massy@hartik.sssup.it>
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 * (see authors.txt for full list of hartik's authors)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://hartik.sssup.it
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 */
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/*
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 * Copyright (C) 2000 Massimiliano Giorgi
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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/*
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 * CVS :        $Id: super.h,v 1.1.1.1 2002-03-29 14:12:50 pj Exp $
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 *
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 * File:        $File$
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 * Revision:    $Revision: 1.1.1.1 $
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 * Last update: $Date: 2002-03-29 14:12:50 $
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 */
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/***
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 This file contains the struct super_block and the functions to manage super blocks.
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***/
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#ifndef __SUPER_H__
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#define __SUPER_H__
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#include <fs/types.h>
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#include <fs/fsconf.h>
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#include <fs/mount.h>
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#ifdef MSDOS_FILESYSTEM
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#include "msdos/msdos_s.h"
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#endif
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struct super_block {
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  /* this are used to build a tree of superblock */
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  /*+ parent of this superblock +*/
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  struct super_block        *sb_parent;
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  /*+ childs of this superblock +*/
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  struct super_block        *sb_childs;
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  /*+ to build a list of childs +*/
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  struct super_block        *sb_next;
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  /*+ device on which the super block reside +*/
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  __dev_t                   sb_dev;
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  /*+ inode of the root directory entry +*/
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  struct inode              *sb_root;
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  /*+ directory entry into the tree of the root directory +*/
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  struct dentry             *sb_droot;
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  /*+ file-system of the super block +*/
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  struct file_system_type   *sb_fs;
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  /*+ pointer to a super operations structure (see superop.h) +*/
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  struct super_operations   *sb_op;
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  /*+ pointer to a dentry operations structure (see dentryop.h) +*/
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  struct dentry_operations  *sb_dop;
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  /*+ mount options (see fs/mount.h) +*/
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  struct mount_opts         sb_mopts;
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  /*+ busy counter (for every operation in progress using this super) +*/
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  int                       sb_busycount;
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  /* flags */
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  /*+ set if this element is valid and used +*/
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  __uint32_t                sb_used:1;
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  /*+ set if blocked (if only one operation must be done) +*/
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  __uint32_t                sb_blocked:1;
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  union {    
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#ifdef MSDOS_FILESYSTEM
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/*+ msdos filesystem specific super block data +*/
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    struct msdos_super_block msdos_sb;
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#endif    
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    /*+ not used +*/
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    unsigned                 dummy;
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  } u;
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};
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/*+ module "super" initialization +*/
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int super_init(void);
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struct super_block *super_getblock(void);
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void super_freeblock(struct super_block *ptr);
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int super_enumdevice(int(*func)(__dev_t));
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struct super_block *get_root_superblock(void);
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void set_root_superblock(struct super_block *sb);
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static __inline__ __dev_t get_root_device(void) { return get_root_superblock()->sb_dev; }
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struct super_block *super_aquire(__dev_t dev);
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void super_release(struct super_block *sb);
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int super_incbusy(struct super_block *sb);
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void super_decbusy(struct super_block *sb);
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void super_insertintotree(struct super_block *sb, struct super_block *psb);
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void super_removefromtree(struct super_block *sb);
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#endif
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