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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_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 | |
61 | int 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)); |
65 | int 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); |
70 | static 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 | |
85 | bail: |
86 | return status; |
87 | } |
88 | |
89 | |
90 | #endif /* _EXTENT_MAP_H */ |
91 |
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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9