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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 | |
29 | struct ocfs2_suballoc_result; |
30 | typedef int (group_search_t)(struct inode *, |
31 | struct buffer_head *, |
32 | u32, /* bits_wanted */ |
33 | u32, /* min_bits */ |
34 | u64, /* max_block */ |
35 | struct ocfs2_suballoc_result *); |
36 | /* found bits */ |
37 | |
38 | struct ocfs2_alloc_context { |
39 | struct inode *ac_inode; /* which bitmap are we allocating from? */ |
40 | struct buffer_head *ac_bh; /* file entry bh */ |
41 | u32 ac_alloc_slot; /* which slot are we allocating from? */ |
42 | u32 ac_bits_wanted; |
43 | u32 ac_bits_given; |
44 | #define OCFS2_AC_USE_LOCAL 1 |
45 | #define OCFS2_AC_USE_MAIN 2 |
46 | #define OCFS2_AC_USE_INODE 3 |
47 | #define OCFS2_AC_USE_META 4 |
48 | u32 ac_which; |
49 | |
50 | /* these are used by the chain search */ |
51 | u16 ac_chain; |
52 | int ac_allow_chain_relink; |
53 | group_search_t *ac_group_search; |
54 | |
55 | u64 ac_last_group; |
56 | u64 ac_max_block; /* Highest block number to allocate. 0 is |
57 | is the same as ~0 - unlimited */ |
58 | |
59 | int ac_find_loc_only; /* hack for reflink operation ordering */ |
60 | struct ocfs2_suballoc_result *ac_find_loc_priv; /* */ |
61 | |
62 | struct ocfs2_alloc_reservation *ac_resv; |
63 | }; |
64 | |
65 | void ocfs2_init_steal_slots(struct ocfs2_super *osb); |
66 | void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac); |
67 | static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac) |
68 | { |
69 | return ac->ac_bits_wanted - ac->ac_bits_given; |
70 | } |
71 | |
72 | /* |
73 | * Please note that the caller must make sure that root_el is the root |
74 | * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise |
75 | * the result may be wrong. |
76 | */ |
77 | int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, |
78 | struct ocfs2_extent_list *root_el, |
79 | struct ocfs2_alloc_context **ac); |
80 | int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, |
81 | int blocks, |
82 | struct ocfs2_alloc_context **ac); |
83 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, |
84 | struct ocfs2_alloc_context **ac); |
85 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, |
86 | u32 bits_wanted, |
87 | struct ocfs2_alloc_context **ac); |
88 | |
89 | int ocfs2_claim_metadata(handle_t *handle, |
90 | struct ocfs2_alloc_context *ac, |
91 | u32 bits_wanted, |
92 | u64 *suballoc_loc, |
93 | u16 *suballoc_bit_start, |
94 | u32 *num_bits, |
95 | u64 *blkno_start); |
96 | int ocfs2_claim_new_inode(handle_t *handle, |
97 | struct inode *dir, |
98 | struct buffer_head *parent_fe_bh, |
99 | struct ocfs2_alloc_context *ac, |
100 | u64 *suballoc_loc, |
101 | u16 *suballoc_bit, |
102 | u64 *fe_blkno); |
103 | int ocfs2_claim_clusters(handle_t *handle, |
104 | struct ocfs2_alloc_context *ac, |
105 | u32 min_clusters, |
106 | u32 *cluster_start, |
107 | u32 *num_clusters); |
108 | /* |
109 | * Use this variant of ocfs2_claim_clusters to specify a maxiumum |
110 | * number of clusters smaller than the allocation reserved. |
111 | */ |
112 | int __ocfs2_claim_clusters(handle_t *handle, |
113 | struct ocfs2_alloc_context *ac, |
114 | u32 min_clusters, |
115 | u32 max_clusters, |
116 | u32 *cluster_start, |
117 | u32 *num_clusters); |
118 | |
119 | int ocfs2_free_suballoc_bits(handle_t *handle, |
120 | struct inode *alloc_inode, |
121 | struct buffer_head *alloc_bh, |
122 | unsigned int start_bit, |
123 | u64 bg_blkno, |
124 | unsigned int count); |
125 | int ocfs2_free_dinode(handle_t *handle, |
126 | struct inode *inode_alloc_inode, |
127 | struct buffer_head *inode_alloc_bh, |
128 | struct ocfs2_dinode *di); |
129 | int ocfs2_free_clusters(handle_t *handle, |
130 | struct inode *bitmap_inode, |
131 | struct buffer_head *bitmap_bh, |
132 | u64 start_blk, |
133 | unsigned int num_clusters); |
134 | int ocfs2_release_clusters(handle_t *handle, |
135 | struct inode *bitmap_inode, |
136 | struct buffer_head *bitmap_bh, |
137 | u64 start_blk, |
138 | unsigned int num_clusters); |
139 | |
140 | static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit) |
141 | { |
142 | u64 group = block - (u64) bit; |
143 | |
144 | return group; |
145 | } |
146 | |
147 | static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, |
148 | u64 bg_blkno) |
149 | { |
150 | /* This should work for all block group descriptors as only |
151 | * the 1st group descriptor of the cluster bitmap is |
152 | * different. */ |
153 | |
154 | if (bg_blkno == osb->first_cluster_group_blkno) |
155 | return 0; |
156 | |
157 | /* the rest of the block groups are located at the beginning |
158 | * of their 1st cluster, so a direct translation just |
159 | * works. */ |
160 | return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); |
161 | } |
162 | |
163 | static inline int ocfs2_is_cluster_bitmap(struct inode *inode) |
164 | { |
165 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
166 | return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; |
167 | } |
168 | |
169 | /* This is for local alloc ONLY. Others should use the task-specific |
170 | * apis above. */ |
171 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, |
172 | struct ocfs2_alloc_context *ac); |
173 | void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac); |
174 | |
175 | /* given a cluster offset, calculate which block group it belongs to |
176 | * and return that block offset. */ |
177 | u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster); |
178 | |
179 | /* |
180 | * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it |
181 | * finds a problem. A caller that wants to check a group descriptor |
182 | * without going readonly should read the block with ocfs2_read_block[s]() |
183 | * and then checking it with this function. This is only resize, really. |
184 | * Everyone else should be using ocfs2_read_group_descriptor(). |
185 | */ |
186 | int ocfs2_check_group_descriptor(struct super_block *sb, |
187 | struct ocfs2_dinode *di, |
188 | struct buffer_head *bh); |
189 | /* |
190 | * Read a group descriptor block into *bh. If *bh is NULL, a bh will be |
191 | * allocated. This is a cached read. The descriptor will be validated with |
192 | * ocfs2_validate_group_descriptor(). |
193 | */ |
194 | int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, |
195 | u64 gd_blkno, struct buffer_head **bh); |
196 | |
197 | int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et, |
198 | u32 clusters_to_add, u32 extents_to_split, |
199 | struct ocfs2_alloc_context **data_ac, |
200 | struct ocfs2_alloc_context **meta_ac); |
201 | |
202 | int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res); |
203 | |
204 | |
205 | |
206 | /* |
207 | * The following two interfaces are for ocfs2_create_inode_in_orphan(). |
208 | */ |
209 | int ocfs2_find_new_inode_loc(struct inode *dir, |
210 | struct buffer_head *parent_fe_bh, |
211 | struct ocfs2_alloc_context *ac, |
212 | u64 *fe_blkno); |
213 | |
214 | int ocfs2_claim_new_inode_at_loc(handle_t *handle, |
215 | struct inode *dir, |
216 | struct ocfs2_alloc_context *ac, |
217 | u64 *suballoc_loc, |
218 | u16 *suballoc_bit, |
219 | u64 di_blkno); |
220 | |
221 | #endif /* _CHAINALLOC_H_ */ |
222 |
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