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1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * suballoc.h
5 *
6 * Defines sub allocator api
7 *
8 * Copyright (C) 2003, 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 as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#ifndef _CHAINALLOC_H_
27#define _CHAINALLOC_H_
28
29typedef int (group_search_t)(struct inode *,
30 struct buffer_head *,
31 u32,
32 u32,
33 u16 *,
34 u16 *);
35
36struct ocfs2_alloc_context {
37 struct inode *ac_inode; /* which bitmap are we allocating from? */
38 struct buffer_head *ac_bh; /* file entry bh */
a4a48911 39 u32 ac_alloc_slot; /* which slot are we allocating from? */
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40 u32 ac_bits_wanted;
41 u32 ac_bits_given;
42#define OCFS2_AC_USE_LOCAL 1
43#define OCFS2_AC_USE_MAIN 2
44#define OCFS2_AC_USE_INODE 3
45#define OCFS2_AC_USE_META 4
46 u32 ac_which;
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47
48 /* these are used by the chain search */
49 u16 ac_chain;
50 int ac_allow_chain_relink;
51 group_search_t *ac_group_search;
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52
53 u64 ac_last_group;
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54};
55
56void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
57static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
58{
59 return ac->ac_bits_wanted - ac->ac_bits_given;
60}
61
62int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
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63 struct ocfs2_dinode *fe,
64 struct ocfs2_alloc_context **ac);
65int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
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66 struct ocfs2_alloc_context **ac);
67int ocfs2_reserve_clusters(struct ocfs2_super *osb,
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68 u32 bits_wanted,
69 struct ocfs2_alloc_context **ac);
70
71int ocfs2_claim_metadata(struct ocfs2_super *osb,
1fabe148 72 handle_t *handle,
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73 struct ocfs2_alloc_context *ac,
74 u32 bits_wanted,
75 u16 *suballoc_bit_start,
76 u32 *num_bits,
77 u64 *blkno_start);
78int ocfs2_claim_new_inode(struct ocfs2_super *osb,
1fabe148 79 handle_t *handle,
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80 struct ocfs2_alloc_context *ac,
81 u16 *suballoc_bit,
82 u64 *fe_blkno);
83int ocfs2_claim_clusters(struct ocfs2_super *osb,
1fabe148 84 handle_t *handle,
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85 struct ocfs2_alloc_context *ac,
86 u32 min_clusters,
87 u32 *cluster_start,
88 u32 *num_clusters);
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89/*
90 * Use this variant of ocfs2_claim_clusters to specify a maxiumum
91 * number of clusters smaller than the allocation reserved.
92 */
93int __ocfs2_claim_clusters(struct ocfs2_super *osb,
94 handle_t *handle,
95 struct ocfs2_alloc_context *ac,
96 u32 min_clusters,
97 u32 max_clusters,
98 u32 *cluster_start,
99 u32 *num_clusters);
ccd979bd 100
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101int ocfs2_free_suballoc_bits(handle_t *handle,
102 struct inode *alloc_inode,
103 struct buffer_head *alloc_bh,
104 unsigned int start_bit,
105 u64 bg_blkno,
106 unsigned int count);
1fabe148 107int ocfs2_free_dinode(handle_t *handle,
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108 struct inode *inode_alloc_inode,
109 struct buffer_head *inode_alloc_bh,
110 struct ocfs2_dinode *di);
1fabe148 111int ocfs2_free_clusters(handle_t *handle,
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112 struct inode *bitmap_inode,
113 struct buffer_head *bitmap_bh,
114 u64 start_blk,
115 unsigned int num_clusters);
116
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117static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
118{
119 u64 group = block - (u64) bit;
120
121 return group;
122}
123
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124static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
125 u64 bg_blkno)
126{
127 /* This should work for all block group descriptors as only
128 * the 1st group descriptor of the cluster bitmap is
129 * different. */
130
131 if (bg_blkno == osb->first_cluster_group_blkno)
132 return 0;
133
134 /* the rest of the block groups are located at the beginning
135 * of their 1st cluster, so a direct translation just
136 * works. */
137 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
138}
139
140static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
141{
142 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
143 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
144}
145
146/* This is for local alloc ONLY. Others should use the task-specific
147 * apis above. */
148int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
149 struct ocfs2_alloc_context *ac);
150
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151/* given a cluster offset, calculate which block group it belongs to
152 * and return that block offset. */
153u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
154
155/* somewhat more expensive than our other checks, so use sparingly. */
156int ocfs2_check_group_descriptor(struct super_block *sb,
157 struct ocfs2_dinode *di,
158 struct ocfs2_group_desc *gd);
ccd979bd 159#endif /* _CHAINALLOC_H_ */