Root/fs/ocfs2/extent_map.h

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
28struct 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
38struct ocfs2_extent_map {
39    unsigned int em_num_items;
40    struct list_head em_list;
41};
42
43void ocfs2_extent_map_init(struct inode *inode);
44void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
45void ocfs2_extent_map_insert_rec(struct inode *inode,
46                 struct ocfs2_extent_rec *rec);
47
48int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
49               u32 *num_clusters, unsigned int *extent_flags);
50int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
51                u64 *ret_count, unsigned int *extent_flags);
52
53int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
54         u64 map_start, u64 map_len);
55
56int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
57                 u32 *p_cluster, u32 *num_clusters,
58                 struct ocfs2_extent_list *el,
59                 unsigned int *extent_flags);
60
61int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
62               struct buffer_head *bhs[], int flags,
63               int (*validate)(struct super_block *sb,
64                       struct buffer_head *bh));
65int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
66                   struct ocfs2_extent_list *el,
67                   struct buffer_head *eb_bh,
68                   u32 v_cluster,
69                   u32 *num_clusters);
70static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
71                    struct buffer_head **bh,
72                    int (*validate)(struct super_block *sb,
73                            struct buffer_head *bh))
74{
75    int status = 0;
76
77    if (bh == NULL) {
78        printk("ocfs2: bh == NULL\n");
79        status = -EINVAL;
80        goto bail;
81    }
82
83    status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
84
85bail:
86    return status;
87}
88
89
90#endif /* _EXTENT_MAP_H */
91

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