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/* -*- mode: c; c-basic-offset: 8; -*-

 * vim: noexpandtab sw=8 ts=8 sts=0:

 *

 * extent_map.h

 *

 * In-memory file extent mappings for OCFS2.

 *

 * Copyright (C) 2004 Oracle.  All rights reserved.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public

 * License, version 2,  as published by the Free Software Foundation.

 *

 * 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 021110-1307, USA.

 */

#ifndef _EXTENT_MAP_H

#define _EXTENT_MAP_H

struct ocfs2_extent_map_item {

        unsigned int                    ei_cpos;

        unsigned int                    ei_phys;

        unsigned int                    ei_clusters;

        unsigned int                    ei_flags;

        struct list_head                ei_list;

};

#define OCFS2_MAX_EXTENT_MAP_ITEMS                      3

struct ocfs2_extent_map {

        unsigned int                    em_num_items;

        struct list_head                em_list;

};

void ocfs2_extent_map_init(struct inode *inode);

void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);

void ocfs2_extent_map_insert_rec(struct inode *inode,

                                 struct ocfs2_extent_rec *rec);

int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,

                       u32 *num_clusters, unsigned int *extent_flags);

int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,

                                u64 *ret_count, unsigned int *extent_flags);

#endif  /* _EXTENT_MAP_H */