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:
7 * Defines sub allocator api
9 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
12 #ifndef _CHAINALLOC_H_
13 #define _CHAINALLOC_H_
15 struct ocfs2_suballoc_result;
16 typedef int (group_search_t)(struct inode *,
18 u32, /* bits_wanted */
21 struct ocfs2_suballoc_result *);
24 struct 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? */
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
36 /* these are used by the chain search */
38 int ac_disable_chain_relink;
39 group_search_t *ac_group_search;
42 u64 ac_max_block; /* Highest block number to allocate. 0 is
43 the same as ~0 - unlimited */
45 int ac_find_loc_only; /* hack for reflink operation ordering */
46 struct ocfs2_suballoc_result *ac_find_loc_priv; /* */
48 struct ocfs2_alloc_reservation *ac_resv;
51 void ocfs2_init_steal_slots(struct ocfs2_super *osb);
52 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
53 static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
55 return ac->ac_bits_wanted - ac->ac_bits_given;
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.
63 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
64 struct ocfs2_extent_list *root_el,
65 struct ocfs2_alloc_context **ac);
66 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
68 struct ocfs2_alloc_context **ac);
69 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
70 struct ocfs2_alloc_context **ac);
71 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
73 struct ocfs2_alloc_context **ac);
75 int ocfs2_alloc_dinode_update_counts(struct inode *inode,
77 struct buffer_head *di_bh,
80 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
81 struct buffer_head *di_bh,
84 int 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,
89 unsigned int num_bits);
91 int ocfs2_claim_metadata(handle_t *handle,
92 struct ocfs2_alloc_context *ac,
95 u16 *suballoc_bit_start,
98 int ocfs2_claim_new_inode(handle_t *handle,
100 struct buffer_head *parent_fe_bh,
101 struct ocfs2_alloc_context *ac,
105 int ocfs2_claim_clusters(handle_t *handle,
106 struct ocfs2_alloc_context *ac,
111 * Use this variant of ocfs2_claim_clusters to specify a maxiumum
112 * number of clusters smaller than the allocation reserved.
114 int __ocfs2_claim_clusters(handle_t *handle,
115 struct ocfs2_alloc_context *ac,
121 int ocfs2_free_suballoc_bits(handle_t *handle,
122 struct inode *alloc_inode,
123 struct buffer_head *alloc_bh,
124 unsigned int start_bit,
127 int ocfs2_free_dinode(handle_t *handle,
128 struct inode *inode_alloc_inode,
129 struct buffer_head *inode_alloc_bh,
130 struct ocfs2_dinode *di);
131 int ocfs2_free_clusters(handle_t *handle,
132 struct inode *bitmap_inode,
133 struct buffer_head *bitmap_bh,
135 unsigned int num_clusters);
136 int ocfs2_release_clusters(handle_t *handle,
137 struct inode *bitmap_inode,
138 struct buffer_head *bitmap_bh,
140 unsigned int num_clusters);
142 static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
144 u64 group = block - (u64) bit;
149 static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
152 /* This should work for all block group descriptors as only
153 * the 1st group descriptor of the cluster bitmap is
156 if (bg_blkno == osb->first_cluster_group_blkno)
159 /* the rest of the block groups are located at the beginning
160 * of their 1st cluster, so a direct translation just
162 return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
165 static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
167 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
168 return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
171 /* This is for local alloc ONLY. Others should use the task-specific
173 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
174 struct ocfs2_alloc_context *ac);
175 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
177 /* given a cluster offset, calculate which block group it belongs to
178 * and return that block offset. */
179 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
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().
188 int ocfs2_check_group_descriptor(struct super_block *sb,
189 struct ocfs2_dinode *di,
190 struct buffer_head *bh);
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().
196 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
197 u64 gd_blkno, struct buffer_head **bh);
199 int 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);
204 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res);
209 * The following two interfaces are for ocfs2_create_inode_in_orphan().
211 int ocfs2_find_new_inode_loc(struct inode *dir,
212 struct buffer_head *parent_fe_bh,
213 struct ocfs2_alloc_context *ac,
216 int ocfs2_claim_new_inode_at_loc(handle_t *handle,
218 struct ocfs2_alloc_context *ac,
223 #endif /* _CHAINALLOC_H_ */