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ccd979bd MF |
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 | ||
29 | typedef int (group_search_t)(struct inode *, | |
30 | struct buffer_head *, | |
31 | u32, | |
32 | u32, | |
33 | u16 *, | |
34 | u16 *); | |
35 | ||
36 | struct 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? */ |
ccd979bd MF |
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; | |
ccd979bd MF |
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; | |
883d4cae MF |
52 | |
53 | u64 ac_last_group; | |
ccd979bd MF |
54 | }; |
55 | ||
56 | void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); | |
57 | static 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 | ||
62 | int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, | |
ccd979bd MF |
63 | struct ocfs2_dinode *fe, |
64 | struct ocfs2_alloc_context **ac); | |
65 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, | |
ccd979bd MF |
66 | struct ocfs2_alloc_context **ac); |
67 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, | |
ccd979bd MF |
68 | u32 bits_wanted, |
69 | struct ocfs2_alloc_context **ac); | |
70 | ||
71 | int ocfs2_claim_metadata(struct ocfs2_super *osb, | |
1fabe148 | 72 | handle_t *handle, |
ccd979bd MF |
73 | struct ocfs2_alloc_context *ac, |
74 | u32 bits_wanted, | |
75 | u16 *suballoc_bit_start, | |
76 | u32 *num_bits, | |
77 | u64 *blkno_start); | |
78 | int ocfs2_claim_new_inode(struct ocfs2_super *osb, | |
1fabe148 | 79 | handle_t *handle, |
ccd979bd MF |
80 | struct ocfs2_alloc_context *ac, |
81 | u16 *suballoc_bit, | |
82 | u64 *fe_blkno); | |
83 | int ocfs2_claim_clusters(struct ocfs2_super *osb, | |
1fabe148 | 84 | handle_t *handle, |
ccd979bd MF |
85 | struct ocfs2_alloc_context *ac, |
86 | u32 min_clusters, | |
87 | u32 *cluster_start, | |
88 | u32 *num_clusters); | |
415cb800 MF |
89 | /* |
90 | * Use this variant of ocfs2_claim_clusters to specify a maxiumum | |
91 | * number of clusters smaller than the allocation reserved. | |
92 | */ | |
93 | int __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 | |
2b604351 MF |
101 | int 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 | 107 | int ocfs2_free_dinode(handle_t *handle, |
ccd979bd MF |
108 | struct inode *inode_alloc_inode, |
109 | struct buffer_head *inode_alloc_bh, | |
110 | struct ocfs2_dinode *di); | |
1fabe148 | 111 | int ocfs2_free_clusters(handle_t *handle, |
ccd979bd MF |
112 | struct inode *bitmap_inode, |
113 | struct buffer_head *bitmap_bh, | |
114 | u64 start_blk, | |
115 | unsigned int num_clusters); | |
116 | ||
2b604351 MF |
117 | static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) |
118 | { | |
119 | u64 group = block - (u64) bit; | |
120 | ||
121 | return group; | |
122 | } | |
123 | ||
ccd979bd MF |
124 | static 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 | ||
140 | static 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. */ | |
148 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, | |
149 | struct ocfs2_alloc_context *ac); | |
150 | ||
d659072f TM |
151 | /* given a cluster offset, calculate which block group it belongs to |
152 | * and return that block offset. */ | |
153 | u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); | |
154 | ||
155 | /* somewhat more expensive than our other checks, so use sparingly. */ | |
156 | int ocfs2_check_group_descriptor(struct super_block *sb, | |
157 | struct ocfs2_dinode *di, | |
158 | struct ocfs2_group_desc *gd); | |
ccd979bd | 159 | #endif /* _CHAINALLOC_H_ */ |