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