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 struct 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 38 struct ocfs2_extent_map { 39 unsigned int em_num_items; 40 struct list_head em_list; 41 }; 42 43 void ocfs2_extent_map_init(struct inode *inode); 44 void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster); 45 void ocfs2_extent_map_insert_rec(struct inode *inode, 46 struct ocfs2_extent_rec *rec); 47 48 int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster, 49 u32 *num_clusters, unsigned int *extent_flags); 50 int 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