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extent_map.h
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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_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
57 
58 int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
59  u32 *p_cluster, u32 *num_clusters,
60  struct ocfs2_extent_list *el,
61  unsigned int *extent_flags);
62 
63 int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
64  struct buffer_head *bhs[], int flags,
65  int (*validate)(struct super_block *sb,
66  struct buffer_head *bh));
67 int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
68  struct ocfs2_extent_list *el,
69  struct buffer_head *eb_bh,
70  u32 v_cluster,
71  u32 *num_clusters);
72 static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
73  struct buffer_head **bh,
74  int (*validate)(struct super_block *sb,
75  struct buffer_head *bh))
76 {
77  int status = 0;
78 
79  if (bh == NULL) {
80  printk("ocfs2: bh == NULL\n");
81  status = -EINVAL;
82  goto bail;
83  }
84 
85  status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
86 
87 bail:
88  return status;
89 }
90 
91 
92 #endif /* _EXTENT_MAP_H */
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