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 */ 47