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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 | 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 */ | |
39 | u32 ac_bits_wanted; | |
40 | u32 ac_bits_given; | |
41 | #define OCFS2_AC_USE_LOCAL 1 | |
42 | #define OCFS2_AC_USE_MAIN 2 | |
43 | #define OCFS2_AC_USE_INODE 3 | |
44 | #define OCFS2_AC_USE_META 4 | |
45 | u32 ac_which; | |
46 | struct ocfs2_journal_handle *ac_handle; | |
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 | ||
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, | |
63 | struct ocfs2_journal_handle *handle, | |
64 | struct ocfs2_dinode *fe, | |
65 | struct ocfs2_alloc_context **ac); | |
66 | int ocfs2_reserve_new_inode(struct ocfs2_super *osb, | |
67 | struct ocfs2_journal_handle *handle, | |
68 | struct ocfs2_alloc_context **ac); | |
69 | int ocfs2_reserve_clusters(struct ocfs2_super *osb, | |
70 | struct ocfs2_journal_handle *handle, | |
71 | u32 bits_wanted, | |
72 | struct ocfs2_alloc_context **ac); | |
73 | ||
74 | int ocfs2_claim_metadata(struct ocfs2_super *osb, | |
75 | struct ocfs2_journal_handle *handle, | |
76 | struct ocfs2_alloc_context *ac, | |
77 | u32 bits_wanted, | |
78 | u16 *suballoc_bit_start, | |
79 | u32 *num_bits, | |
80 | u64 *blkno_start); | |
81 | int ocfs2_claim_new_inode(struct ocfs2_super *osb, | |
82 | struct ocfs2_journal_handle *handle, | |
83 | struct ocfs2_alloc_context *ac, | |
84 | u16 *suballoc_bit, | |
85 | u64 *fe_blkno); | |
86 | int ocfs2_claim_clusters(struct ocfs2_super *osb, | |
87 | struct ocfs2_journal_handle *handle, | |
88 | struct ocfs2_alloc_context *ac, | |
89 | u32 min_clusters, | |
90 | u32 *cluster_start, | |
91 | u32 *num_clusters); | |
92 | ||
93 | int ocfs2_free_dinode(struct ocfs2_journal_handle *handle, | |
94 | struct inode *inode_alloc_inode, | |
95 | struct buffer_head *inode_alloc_bh, | |
96 | struct ocfs2_dinode *di); | |
97 | int ocfs2_free_extent_block(struct ocfs2_journal_handle *handle, | |
98 | struct inode *eb_alloc_inode, | |
99 | struct buffer_head *eb_alloc_bh, | |
100 | struct ocfs2_extent_block *eb); | |
101 | int ocfs2_free_clusters(struct ocfs2_journal_handle *handle, | |
102 | struct inode *bitmap_inode, | |
103 | struct buffer_head *bitmap_bh, | |
104 | u64 start_blk, | |
105 | unsigned int num_clusters); | |
106 | ||
107 | static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb, | |
108 | u64 bg_blkno) | |
109 | { | |
110 | /* This should work for all block group descriptors as only | |
111 | * the 1st group descriptor of the cluster bitmap is | |
112 | * different. */ | |
113 | ||
114 | if (bg_blkno == osb->first_cluster_group_blkno) | |
115 | return 0; | |
116 | ||
117 | /* the rest of the block groups are located at the beginning | |
118 | * of their 1st cluster, so a direct translation just | |
119 | * works. */ | |
120 | return ocfs2_blocks_to_clusters(osb->sb, bg_blkno); | |
121 | } | |
122 | ||
123 | static inline int ocfs2_is_cluster_bitmap(struct inode *inode) | |
124 | { | |
125 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
126 | return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno; | |
127 | } | |
128 | ||
129 | /* This is for local alloc ONLY. Others should use the task-specific | |
130 | * apis above. */ | |
131 | int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, | |
132 | struct ocfs2_alloc_context *ac); | |
133 | ||
134 | #endif /* _CHAINALLOC_H_ */ |