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);
ocfs2_read_virt_block(struct inode * inode,u64 v_block,struct buffer_head ** bh,int (* validate)(struct super_block * sb,struct buffer_head * bh))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