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