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