blob: de91e3e41a224ac7f1eb39f1e35bdd22034d811a [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- 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
Mark Fasheh83418972007-04-23 18:53:12 -070028struct 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
Mark Fasheh9517bac2007-02-09 20:24:12 -080048int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
Mark Fasheh49cb8d22007-03-09 16:21:46 -080049 u32 *num_clusters, unsigned int *extent_flags);
Mark Fasheh363041a2007-01-17 12:31:35 -080050int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
Mark Fasheh4f902c32007-03-09 16:26:50 -080051 u64 *ret_count, unsigned int *extent_flags);
Mark Fashehccd979b2005-12-15 14:31:24 -080052
53#endif /* _EXTENT_MAP_H */