1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* -*- mode: c; c-basic-offset: 8; -*- 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * extent_map.h 6 * 7 * In-memory file extent mappings for OCFS2. 8 * 9 * Copyright (C) 2004 Oracle. All rights reserved. 10 */ 11 12#ifndef _EXTENT_MAP_H 13#define _EXTENT_MAP_H 14 15struct ocfs2_extent_map_item { 16 unsigned int ei_cpos; 17 unsigned int ei_phys; 18 unsigned int ei_clusters; 19 unsigned int ei_flags; 20 21 struct list_head ei_list; 22}; 23 24#define OCFS2_MAX_EXTENT_MAP_ITEMS 3 25struct ocfs2_extent_map { 26 unsigned int em_num_items; 27 struct list_head em_list; 28}; 29 30void ocfs2_extent_map_init(struct inode *inode); 31void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster); 32void ocfs2_extent_map_insert_rec(struct inode *inode, 33 struct ocfs2_extent_rec *rec); 34 35int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster, 36 u32 *num_clusters, unsigned int *extent_flags); 37int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno, 38 u64 *ret_count, unsigned int *extent_flags); 39 40int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 41 u64 map_start, u64 map_len); 42 43int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, 44 u64 map_start, u64 map_len); 45 46int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin); 47 48int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster, 49 u32 *p_cluster, u32 *num_clusters, 50 struct ocfs2_extent_list *el, 51 unsigned int *extent_flags); 52 53int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr, 54 struct buffer_head *bhs[], int flags, 55 int (*validate)(struct super_block *sb, 56 struct buffer_head *bh)); 57int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci, 58 struct ocfs2_extent_list *el, 59 struct buffer_head *eb_bh, 60 u32 v_cluster, 61 u32 *num_clusters); 62static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block, 63 struct buffer_head **bh, 64 int (*validate)(struct super_block *sb, 65 struct buffer_head *bh)) 66{ 67 int status = 0; 68 69 if (bh == NULL) { 70 printk("ocfs2: bh == NULL\n"); 71 status = -EINVAL; 72 goto bail; 73 } 74 75 status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate); 76 77bail: 78 return status; 79} 80 81 82#endif /* _EXTENT_MAP_H */ 83