1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /* -*- mode: c; c-basic-offset: 8; -*-
3*4882a593Smuzhiyun * vim: noexpandtab sw=8 ts=8 sts=0:
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * extent_map.h
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * In-memory file extent mappings for OCFS2.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Copyright (C) 2004 Oracle. All rights reserved.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #ifndef _EXTENT_MAP_H
13*4882a593Smuzhiyun #define _EXTENT_MAP_H
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct ocfs2_extent_map_item {
16*4882a593Smuzhiyun unsigned int ei_cpos;
17*4882a593Smuzhiyun unsigned int ei_phys;
18*4882a593Smuzhiyun unsigned int ei_clusters;
19*4882a593Smuzhiyun unsigned int ei_flags;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun struct list_head ei_list;
22*4882a593Smuzhiyun };
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define OCFS2_MAX_EXTENT_MAP_ITEMS 3
25*4882a593Smuzhiyun struct ocfs2_extent_map {
26*4882a593Smuzhiyun unsigned int em_num_items;
27*4882a593Smuzhiyun struct list_head em_list;
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun void ocfs2_extent_map_init(struct inode *inode);
31*4882a593Smuzhiyun void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
32*4882a593Smuzhiyun void ocfs2_extent_map_insert_rec(struct inode *inode,
33*4882a593Smuzhiyun struct ocfs2_extent_rec *rec);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
36*4882a593Smuzhiyun u32 *num_clusters, unsigned int *extent_flags);
37*4882a593Smuzhiyun int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
38*4882a593Smuzhiyun u64 *ret_count, unsigned int *extent_flags);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
41*4882a593Smuzhiyun u64 map_start, u64 map_len);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
44*4882a593Smuzhiyun u64 map_start, u64 map_len);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
49*4882a593Smuzhiyun u32 *p_cluster, u32 *num_clusters,
50*4882a593Smuzhiyun struct ocfs2_extent_list *el,
51*4882a593Smuzhiyun unsigned int *extent_flags);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
54*4882a593Smuzhiyun struct buffer_head *bhs[], int flags,
55*4882a593Smuzhiyun int (*validate)(struct super_block *sb,
56*4882a593Smuzhiyun struct buffer_head *bh));
57*4882a593Smuzhiyun int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
58*4882a593Smuzhiyun struct ocfs2_extent_list *el,
59*4882a593Smuzhiyun struct buffer_head *eb_bh,
60*4882a593Smuzhiyun u32 v_cluster,
61*4882a593Smuzhiyun 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*4882a593Smuzhiyun static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
63*4882a593Smuzhiyun struct buffer_head **bh,
64*4882a593Smuzhiyun int (*validate)(struct super_block *sb,
65*4882a593Smuzhiyun struct buffer_head *bh))
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun int status = 0;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun if (bh == NULL) {
70*4882a593Smuzhiyun printk("ocfs2: bh == NULL\n");
71*4882a593Smuzhiyun status = -EINVAL;
72*4882a593Smuzhiyun goto bail;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun bail:
78*4882a593Smuzhiyun return status;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun #endif /* _EXTENT_MAP_H */
83