1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * extent_map.h
5  *
6  * In-memory file extent mappings for OCFS2.
7  *
8  * Copyright (C) 2004 Oracle.  All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public
12  * License, version 2,  as published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public
20  * License along with this program; if not, write to the
21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22  * Boston, MA 021110-1307, USA.
23  */
24 
25 #ifndef _EXTENT_MAP_H
26 #define _EXTENT_MAP_H
27 
28 struct ocfs2_extent_map_item {
29 	unsigned int			ei_cpos;
30 	unsigned int			ei_phys;
31 	unsigned int			ei_clusters;
32 	unsigned int			ei_flags;
33 
34 	struct list_head		ei_list;
35 };
36 
37 #define OCFS2_MAX_EXTENT_MAP_ITEMS			3
38 struct ocfs2_extent_map {
39 	unsigned int			em_num_items;
40 	struct list_head		em_list;
41 };
42 
43 void ocfs2_extent_map_init(struct inode *inode);
44 void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
45 void ocfs2_extent_map_insert_rec(struct inode *inode,
46 				 struct ocfs2_extent_rec *rec);
47 
48 int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
49 		       u32 *num_clusters, unsigned int *extent_flags);
50 int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
51 				u64 *ret_count, unsigned int *extent_flags);
52 
53 int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
54 		 u64 map_start, u64 map_len);
55 
56 int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
57 		       u64 map_start, u64 map_len);
58 
59 int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
60 
61 int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
62 			     u32 *p_cluster, u32 *num_clusters,
63 			     struct ocfs2_extent_list *el,
64 			     unsigned int *extent_flags);
65 
66 int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
67 			   struct buffer_head *bhs[], int flags,
68 			   int (*validate)(struct super_block *sb,
69 					   struct buffer_head *bh));
70 int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
71 			       struct ocfs2_extent_list *el,
72 			       struct buffer_head *eb_bh,
73 			       u32 v_cluster,
74 			       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))75 static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
76 					struct buffer_head **bh,
77 					int (*validate)(struct super_block *sb,
78 							struct buffer_head *bh))
79 {
80 	int status = 0;
81 
82 	if (bh == NULL) {
83 		printk("ocfs2: bh == NULL\n");
84 		status = -EINVAL;
85 		goto bail;
86 	}
87 
88 	status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
89 
90 bail:
91 	return status;
92 }
93 
94 
95 #endif  /* _EXTENT_MAP_H */
96