1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * extent_map.h
5 *
6 * In-memory file extent mappings for OCFS2.
7 *
8 * Copyright (C) 2004 Oracle.  All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License, version 2,  as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public
20 * License along with this program; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 021110-1307, USA.
23 */
24
25#ifndef _EXTENT_MAP_H
26#define _EXTENT_MAP_H
27
28struct ocfs2_extent_map_item {
29	unsigned int			ei_cpos;
30	unsigned int			ei_phys;
31	unsigned int			ei_clusters;
32	unsigned int			ei_flags;
33
34	struct list_head		ei_list;
35};
36
37#define OCFS2_MAX_EXTENT_MAP_ITEMS			3
38struct ocfs2_extent_map {
39	unsigned int			em_num_items;
40	struct list_head		em_list;
41};
42
43void ocfs2_extent_map_init(struct inode *inode);
44void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
45void ocfs2_extent_map_insert_rec(struct inode *inode,
46				 struct ocfs2_extent_rec *rec);
47
48int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
49		       u32 *num_clusters, unsigned int *extent_flags);
50int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
51				u64 *ret_count, unsigned int *extent_flags);
52
53#endif  /* _EXTENT_MAP_H */
54