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