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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 | ||
28 | int init_ocfs2_extent_maps(void); | |
29 | void exit_ocfs2_extent_maps(void); | |
30 | ||
31 | /* | |
32 | * EVERY CALL here except _init, _trunc, and _drop expects alloc_sem | |
33 | * to be held. The allocation cannot change at all while the map is | |
34 | * in the process of being updated. | |
35 | */ | |
36 | int ocfs2_extent_map_init(struct inode *inode); | |
37 | int ocfs2_extent_map_append(struct inode *inode, | |
38 | struct ocfs2_extent_rec *rec, | |
39 | u32 new_clusters); | |
40 | int ocfs2_extent_map_get_blocks(struct inode *inode, | |
41 | u64 v_blkno, int count, | |
42 | u64 *p_blkno, int *ret_count); | |
43 | int ocfs2_extent_map_drop(struct inode *inode, u32 new_clusters); | |
44 | int ocfs2_extent_map_trunc(struct inode *inode, u32 new_clusters); | |
45 | ||
46 | #endif /* _EXTENT_MAP_H */ |