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
15 struct 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
25 struct ocfs2_extent_map {
26 unsigned int em_num_items;
27 struct list_head em_list;
28 };
29
30 void ocfs2_extent_map_init(struct inode *inode);
31 void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
32 void ocfs2_extent_map_insert_rec(struct inode *inode,
33 struct ocfs2_extent_rec *rec);
34
35 int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
36 u32 *num_clusters, unsigned int *extent_flags);
37 int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
38 u64 *ret_count, unsigned int *extent_flags);
39
40 int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
41 u64 map_start, u64 map_len);
42
43 int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
44 u64 map_start, u64 map_len);
45
46 int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
47
48 int 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
53 int 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));
57 int 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);
ocfs2_read_virt_block(struct inode * inode,u64 v_block,struct buffer_head ** bh,int (* validate)(struct super_block * sb,struct buffer_head * bh))62 static 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
77 bail:
78 return status;
79 }
80
81
82 #endif /* _EXTENT_MAP_H */
83