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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * suballoc.h
4 *
5 * Defines sub allocator api
6 *
7 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
8 */
9
10#ifndef _CHAINALLOC_H_
11#define _CHAINALLOC_H_
12
13struct ocfs2_suballoc_result;
14typedef int (group_search_t)(struct inode *,
15 struct buffer_head *,
16 u32, /* bits_wanted */
17 u32, /* min_bits */
18 u64, /* max_block */
19 struct ocfs2_suballoc_result *);
20 /* found bits */
21
22struct ocfs2_alloc_context {
23 struct inode *ac_inode; /* which bitmap are we allocating from? */
24 struct buffer_head *ac_bh; /* file entry bh */
25 u32 ac_alloc_slot; /* which slot are we allocating from? */
26 u32 ac_bits_wanted;
27 u32 ac_bits_given;
28#define OCFS2_AC_USE_LOCAL 1
29#define OCFS2_AC_USE_MAIN 2
30#define OCFS2_AC_USE_INODE 3
31#define OCFS2_AC_USE_META 4
32#define OCFS2_AC_USE_MAIN_DISCONTIG 5
33 u32 ac_which;
34
35 /* these are used by the chain search */
36 u16 ac_chain;
37 int ac_disable_chain_relink;
38 group_search_t *ac_group_search;
39
40 u64 ac_last_group;
41 u64 ac_max_block; /* Highest block number to allocate. 0 is
42 the same as ~0 - unlimited */
43
44 int ac_find_loc_only; /* hack for reflink operation ordering */
45 struct ocfs2_suballoc_result *ac_find_loc_priv; /* */
46
47 struct ocfs2_alloc_reservation *ac_resv;
48};
49
50void ocfs2_init_steal_slots(struct ocfs2_super *osb);
51void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
52static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
53{
54 return ac->ac_bits_wanted - ac->ac_bits_given;
55}
56
57/*
58 * Please note that the caller must make sure that root_el is the root
59 * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
60 * the result may be wrong.
61 */
62int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
63 struct ocfs2_extent_list *root_el,
64 struct ocfs2_alloc_context **ac);
65int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
66 int blocks,
67 struct ocfs2_alloc_context **ac);
68int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
69 struct ocfs2_alloc_context **ac);
70int ocfs2_reserve_clusters(struct ocfs2_super *osb,
71 u32 bits_wanted,
72 struct ocfs2_alloc_context **ac);
73
74int ocfs2_alloc_dinode_update_counts(struct inode *inode,
75 handle_t *handle,
76 struct buffer_head *di_bh,
77 u32 num_bits,
78 u16 chain);
79void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
80 struct buffer_head *di_bh,
81 u32 num_bits,
82 u16 chain);
83u16 ocfs2_find_max_contig_free_bits(void *bitmap,
84 u16 total_bits, u16 start);
85int ocfs2_block_group_set_bits(handle_t *handle,
86 struct inode *alloc_inode,
87 struct ocfs2_group_desc *bg,
88 struct buffer_head *group_bh,
89 unsigned int bit_off,
90 unsigned int num_bits,
91 unsigned int max_contig_bits,
92 int fastpath);
93
94int ocfs2_claim_metadata(handle_t *handle,
95 struct ocfs2_alloc_context *ac,
96 u32 bits_wanted,
97 u64 *suballoc_loc,
98 u16 *suballoc_bit_start,
99 u32 *num_bits,
100 u64 *blkno_start);
101int ocfs2_claim_new_inode(handle_t *handle,
102 struct inode *dir,
103 struct buffer_head *parent_fe_bh,
104 struct ocfs2_alloc_context *ac,
105 u64 *suballoc_loc,
106 u16 *suballoc_bit,
107 u64 *fe_blkno);
108int ocfs2_claim_clusters(handle_t *handle,
109 struct ocfs2_alloc_context *ac,
110 u32 min_clusters,
111 u32 *cluster_start,
112 u32 *num_clusters);
113/*
114 * Use this variant of ocfs2_claim_clusters to specify a maximum
115 * number of clusters smaller than the allocation reserved.
116 */
117int __ocfs2_claim_clusters(handle_t *handle,
118 struct ocfs2_alloc_context *ac,
119 u32 min_clusters,
120 u32 max_clusters,
121 u32 *cluster_start,
122 u32 *num_clusters);
123
124int ocfs2_free_suballoc_bits(handle_t *handle,
125 struct inode *alloc_inode,
126 struct buffer_head *alloc_bh,
127 unsigned int start_bit,
128 u64 bg_blkno,
129 unsigned int count);
130int ocfs2_free_dinode(handle_t *handle,
131 struct inode *inode_alloc_inode,
132 struct buffer_head *inode_alloc_bh,
133 struct ocfs2_dinode *di);
134int ocfs2_free_clusters(handle_t *handle,
135 struct inode *bitmap_inode,
136 struct buffer_head *bitmap_bh,
137 u64 start_blk,
138 unsigned int num_clusters);
139int ocfs2_release_clusters(handle_t *handle,
140 struct inode *bitmap_inode,
141 struct buffer_head *bitmap_bh,
142 u64 start_blk,
143 unsigned int num_clusters);
144
145static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
146{
147 u64 group = block - (u64) bit;
148
149 return group;
150}
151
152static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
153 u64 bg_blkno)
154{
155 /* This should work for all block group descriptors as only
156 * the 1st group descriptor of the cluster bitmap is
157 * different. */
158
159 if (bg_blkno == osb->first_cluster_group_blkno)
160 return 0;
161
162 /* the rest of the block groups are located at the beginning
163 * of their 1st cluster, so a direct translation just
164 * works. */
165 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
166}
167
168static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
169{
170 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
171 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
172}
173
174/* This is for local alloc ONLY. Others should use the task-specific
175 * apis above. */
176int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
177 struct ocfs2_alloc_context *ac);
178void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
179
180/* given a cluster offset, calculate which block group it belongs to
181 * and return that block offset. */
182u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
183
184/*
185 * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it
186 * finds a problem. A caller that wants to check a group descriptor
187 * without going readonly should read the block with ocfs2_read_block[s]()
188 * and then checking it with this function. This is only resize, really.
189 * Everyone else should be using ocfs2_read_group_descriptor().
190 */
191int ocfs2_check_group_descriptor(struct super_block *sb,
192 struct ocfs2_dinode *di,
193 struct buffer_head *bh);
194/*
195 * Read a group descriptor block into *bh. If *bh is NULL, a bh will be
196 * allocated. This is a cached read. The descriptor will be validated with
197 * ocfs2_validate_group_descriptor().
198 */
199int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
200 u64 gd_blkno, struct buffer_head **bh);
201
202int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et,
203 u32 clusters_to_add, u32 extents_to_split,
204 struct ocfs2_alloc_context **data_ac,
205 struct ocfs2_alloc_context **meta_ac);
206
207int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res);
208
209
210
211/*
212 * The following two interfaces are for ocfs2_create_inode_in_orphan().
213 */
214int ocfs2_find_new_inode_loc(struct inode *dir,
215 struct buffer_head *parent_fe_bh,
216 struct ocfs2_alloc_context *ac,
217 u64 *fe_blkno);
218
219int ocfs2_claim_new_inode_at_loc(handle_t *handle,
220 struct inode *dir,
221 struct ocfs2_alloc_context *ac,
222 u64 *suballoc_loc,
223 u16 *suballoc_bit,
224 u64 di_blkno);
225
226#endif /* _CHAINALLOC_H_ */