[linux.git] / fs / nilfs2 / direct.h

/*
 * direct.h - NILFS direct block pointer.
 *
 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Koji Sato <[email protected]>.
 */

#ifndef _NILFS_DIRECT_H
#define _NILFS_DIRECT_H

#include <linux/types.h>
#include <linux/buffer_head.h>
#include "bmap.h"


struct nilfs_direct;

/**
 * struct nilfs_direct_node - direct node
 * @dn_flags: flags
 * @dn_pad: padding
 */
struct nilfs_direct_node {
	__u8 dn_flags;
	__u8 pad[7];
};

/**
 * struct nilfs_direct - direct mapping
 * @d_bmap: bmap structure
 */
struct nilfs_direct {
	struct nilfs_bmap d_bmap;
};


#define NILFS_DIRECT_NBLOCKS	(NILFS_BMAP_SIZE / sizeof(__le64) - 1)
#define NILFS_DIRECT_KEY_MIN	0
#define NILFS_DIRECT_KEY_MAX	(NILFS_DIRECT_NBLOCKS - 1)


int nilfs_direct_init(struct nilfs_bmap *);
int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
				    __u64 *, int);


#endif	/* _NILFS_DIRECT_H */
Commit	Line	Data
36a580eb KS	1	/*
	2	* direct.h - NILFS direct block pointer.
	3	*
	4	* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Written by Koji Sato <[email protected]>.
	21	*/
	22
	23	#ifndef _NILFS_DIRECT_H
	24	#define _NILFS_DIRECT_H
	25
	26	#include <linux/types.h>
	27	#include <linux/buffer_head.h>
	28	#include "bmap.h"
	29
	30
	31	struct nilfs_direct;
	32
36a580eb KS	33	/**
	34	* struct nilfs_direct_node - direct node
	35	* @dn_flags: flags
	36	* @dn_pad: padding
	37	*/
	38	struct nilfs_direct_node {
	39	__u8 dn_flags;
	40	__u8 pad[7];
	41	};
	42
	43	/**
	44	* struct nilfs_direct - direct mapping
	45	* @d_bmap: bmap structure
36a580eb KS	46	*/
	47	struct nilfs_direct {
	48	struct nilfs_bmap d_bmap;
36a580eb KS	49	};
	50
	51
	52	#define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
	53	#define NILFS_DIRECT_KEY_MIN 0
	54	#define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1)
	55
	56
3033342a	57	int nilfs_direct_init(struct nilfs_bmap *);
36a580eb	58	int nilfs_direct_delete_and_convert(struct nilfs_bmap , __u64, __u64 ,
3033342a	59	__u64 *, int);
36a580eb KS	60
	61
	62	#endif /* _NILFS_DIRECT_H */