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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 *, | |
1187c968 JB |
31 | u32, /* bits_wanted */ |
32 | u32, /* min_bits */ | |
33 | u64, /* max_block */ | |
34 | u16 *, /* *bit_off */ | |
35 | u16 *); /* *bits_found */ | |
ccd979bd MF |
36 | |
37 | struct ocfs2_alloc_context { | |
38 | struct inode *ac_inode; /* which bitmap are we allocating from? */ | |
39 | struct buffer_head *ac_bh; /* file entry bh */ | |
a4a48911 | 40 | u32 ac_alloc_slot; /* which slot are we allocating from? */ |
ccd979bd MF |
41 | u32 ac_bits_wanted; |
42 | u32 ac_bits_given; | |
43 | #define OCFS2_AC_USE_LOCAL 1 | |
44 | #define OCFS2_AC_USE_MAIN 2 | |
45 | #define OCFS2_AC_USE_INODE 3 | |
46 | #define OCFS2_AC_USE_META 4 | |
47 | u32 ac_which; | |
ccd979bd MF |
48 | |
49 | /* these are used by the chain search */ | |
50 | u16 ac_chain; | |
51 | int ac_allow_chain_relink; | |
52 | group_search_t *ac_group_search; | |
883d4cae MF |
53 | |
54 | u64 ac_last_group; | |
1187c968 JB |
55 | u64 ac_max_block; /* Highest block number to allocate. 0 is |
56 | is the same as ~0 - unlimited */ | |
ccd979bd MF |
57 | }; |
58 | ||
59 | void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); | |
60 | static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) | |
61 | { | |
62 | return ac->ac_bits_wanted - ac->ac_bits_given; | |
63 | } | |
64 | ||
811f933d TM |
65 | /* |
66 | * Please note that the caller must make sure that root_el is the root | |
67 | * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise | |
68 | * the result may be wrong. | |
69 | */ | |
ccd979bd | 70 | int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, |
811f933d | 71 | struct ocfs2_extent_list *root_el, |
ccd979bd | 72 | struct ocfs2_alloc_context **ac); |
cf1d6c76 TY |
73 | int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, |
74 | int blocks, | |
75 | struct ocfs2_alloc_context **ac); | |
ccd979bd | 76 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, |
ccd979bd MF |
77 | struct ocfs2_alloc_context **ac); |
78 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, | |
ccd979bd MF |
79 | u32 bits_wanted, |
80 | struct ocfs2_alloc_context **ac); | |
81 | ||
82 | int ocfs2_claim_metadata(struct ocfs2_super *osb, | |
1fabe148 | 83 | handle_t *handle, |
ccd979bd MF |
84 | struct ocfs2_alloc_context *ac, |
85 | u32 bits_wanted, | |
86 | u16 *suballoc_bit_start, | |
87 | u32 *num_bits, | |
88 | u64 *blkno_start); | |
89 | int ocfs2_claim_new_inode(struct ocfs2_super *osb, | |
1fabe148 | 90 | handle_t *handle, |
13821151 TM |
91 | struct inode *dir, |
92 | struct buffer_head *parent_fe_bh, | |
ccd979bd MF |
93 | struct ocfs2_alloc_context *ac, |
94 | u16 *suballoc_bit, | |
95 | u64 *fe_blkno); | |
96 | int ocfs2_claim_clusters(struct ocfs2_super *osb, | |
1fabe148 | 97 | handle_t *handle, |
ccd979bd MF |
98 | struct ocfs2_alloc_context *ac, |
99 | u32 min_clusters, | |
100 | u32 *cluster_start, | |
101 | u32 *num_clusters); | |
415cb800 MF |
102 | /* |
103 | * Use this variant of ocfs2_claim_clusters to specify a maxiumum | |
104 | * number of clusters smaller than the allocation reserved. | |
105 | */ | |
106 | int __ocfs2_claim_clusters(struct ocfs2_super *osb, | |
107 | handle_t *handle, | |
108 | struct ocfs2_alloc_context *ac, | |
109 | u32 min_clusters, | |
110 | u32 max_clusters, | |
111 | u32 *cluster_start, | |
112 | u32 *num_clusters); | |
ccd979bd | 113 | |
2b604351 MF |
114 | int ocfs2_free_suballoc_bits(handle_t *handle, |
115 | struct inode *alloc_inode, | |
116 | struct buffer_head *alloc_bh, | |
117 | unsigned int start_bit, | |
118 | u64 bg_blkno, | |
119 | unsigned int count); | |
1fabe148 | 120 | int ocfs2_free_dinode(handle_t *handle, |
ccd979bd MF |
121 | struct inode *inode_alloc_inode, |
122 | struct buffer_head *inode_alloc_bh, | |
123 | struct ocfs2_dinode *di); | |
1fabe148 | 124 | int ocfs2_free_clusters(handle_t *handle, |
ccd979bd MF |
125 | struct inode *bitmap_inode, |
126 | struct buffer_head *bitmap_bh, | |
127 | u64 start_blk, | |
128 | unsigned int num_clusters); | |
129 | ||
2b604351 MF |
130 | static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) |
131 | { | |
132 | u64 group = block - (u64) bit; | |
133 | ||
134 | return group; | |
135 | } | |
136 | ||
ccd979bd MF |
137 | static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, |
138 | u64 bg_blkno) | |
139 | { | |
140 | /* This should work for all block group descriptors as only | |
141 | * the 1st group descriptor of the cluster bitmap is | |
142 | * different. */ | |
143 | ||
144 | if (bg_blkno == osb->first_cluster_group_blkno) | |
145 | return 0; | |
146 | ||
147 | /* the rest of the block groups are located at the beginning | |
148 | * of their 1st cluster, so a direct translation just | |
149 | * works. */ | |
150 | return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); | |
151 | } | |
152 | ||
153 | static inline int ocfs2_is_cluster_bitmap(struct inode *inode) | |
154 | { | |
155 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
156 | return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; | |
157 | } | |
158 | ||
159 | /* This is for local alloc ONLY. Others should use the task-specific | |
160 | * apis above. */ | |
161 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, | |
162 | struct ocfs2_alloc_context *ac); | |
9c7af40b | 163 | void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); |
ccd979bd | 164 | |
d659072f TM |
165 | /* given a cluster offset, calculate which block group it belongs to |
166 | * and return that block offset. */ | |
167 | u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); | |
168 | ||
57e3e797 | 169 | /* |
970e4936 | 170 | * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it |
57e3e797 | 171 | * finds a problem. A caller that wants to check a group descriptor |
970e4936 JB |
172 | * without going readonly should read the block with ocfs2_read_block[s]() |
173 | * and then checking it with this function. This is only resize, really. | |
174 | * Everyone else should be using ocfs2_read_group_descriptor(). | |
57e3e797 | 175 | */ |
970e4936 JB |
176 | int ocfs2_check_group_descriptor(struct super_block *sb, |
177 | struct ocfs2_dinode *di, | |
178 | struct buffer_head *bh); | |
68f64d47 JB |
179 | /* |
180 | * Read a group descriptor block into *bh. If *bh is NULL, a bh will be | |
181 | * allocated. This is a cached read. The descriptor will be validated with | |
182 | * ocfs2_validate_group_descriptor(). | |
183 | */ | |
184 | int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, | |
185 | u64 gd_blkno, struct buffer_head **bh); | |
57e3e797 | 186 | |
f99b9b7c | 187 | int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, |
e7d4cb6b TM |
188 | u32 clusters_to_add, u32 extents_to_split, |
189 | struct ocfs2_alloc_context **data_ac, | |
f99b9b7c | 190 | struct ocfs2_alloc_context **meta_ac); |
6ca497a8 | 191 | |
192 | int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); | |
ccd979bd | 193 | #endif /* _CHAINALLOC_H_ */ |