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 int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 54 u64 map_start, u64 map_len); 55 56 int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, 57 u64 map_start, u64 map_len); 58 59 int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin); 60 61 int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster, 62 u32 *p_cluster, u32 *num_clusters, 63 struct ocfs2_extent_list *el, 64 unsigned int *extent_flags); 65 66 int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr, 67 struct buffer_head *bhs[], int flags, 68 int (*validate)(struct super_block *sb, 69 struct buffer_head *bh)); 70 int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci, 71 struct ocfs2_extent_list *el, 72 struct buffer_head *eb_bh, 73 u32 v_cluster, 74 u32 *num_clusters); 75 static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block, 76 struct buffer_head **bh, 77 int (*validate)(struct super_block *sb, 78 struct buffer_head *bh)) 79 { 80 int status = 0; 81 82 if (bh == NULL) { 83 printk("ocfs2: bh == NULL\n"); 84 status = -EINVAL; 85 goto bail; 86 } 87 88 status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate); 89 90 bail: 91 return status; 92 } 93 94 95 #endif /* _EXTENT_MAP_H */ 96