1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef BTRFS_EXTENT_TREE_H
4#define BTRFS_EXTENT_TREE_H
5
6#include "misc.h"
7#include "block-group.h"
8
9struct btrfs_free_cluster;
10struct btrfs_delayed_ref_head;
11
12enum btrfs_extent_allocation_policy {
13 BTRFS_EXTENT_ALLOC_CLUSTERED,
14 BTRFS_EXTENT_ALLOC_ZONED,
15};
16
17struct find_free_extent_ctl {
18 /* Basic allocation info */
19 u64 ram_bytes;
20 u64 num_bytes;
21 u64 min_alloc_size;
22 u64 empty_size;
23 u64 flags;
24 int delalloc;
25
26 /* Where to start the search inside the bg */
27 u64 search_start;
28
29 /* For clustered allocation */
30 u64 empty_cluster;
31 struct btrfs_free_cluster *last_ptr;
32 bool use_cluster;
33
34 bool have_caching_bg;
35 bool orig_have_caching_bg;
36
37 /* Allocation is called for tree-log */
38 bool for_treelog;
39
40 /* Allocation is called for data relocation */
41 bool for_data_reloc;
42
43 /* RAID index, converted from flags */
44 int index;
45
46 /*
47 * Current loop number, check find_free_extent_update_loop() for details
48 */
49 int loop;
50
51 /*
52 * Set to true if we're retrying the allocation on this block group
53 * after waiting for caching progress, this is so that we retry only
54 * once before moving on to another block group.
55 */
56 bool retry_uncached;
57
58 /* If current block group is cached */
59 int cached;
60
61 /* Max contiguous hole found */
62 u64 max_extent_size;
63
64 /* Total free space from free space cache, not always contiguous */
65 u64 total_free_space;
66
67 /* Found result */
68 u64 found_offset;
69
70 /* Hint where to start looking for an empty space */
71 u64 hint_byte;
72
73 /* Allocation policy */
74 enum btrfs_extent_allocation_policy policy;
75
76 /* Whether or not the allocator is currently following a hint */
77 bool hinted;
78
79 /* Size class of block groups to prefer in early loops */
80 enum btrfs_block_group_size_class size_class;
81};
82
83enum btrfs_inline_ref_type {
84 BTRFS_REF_TYPE_INVALID,
85 BTRFS_REF_TYPE_BLOCK,
86 BTRFS_REF_TYPE_DATA,
87 BTRFS_REF_TYPE_ANY,
88};
89
90int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
91 struct btrfs_extent_inline_ref *iref,
92 enum btrfs_inline_ref_type is_data);
93u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
94
95int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, u64 min_bytes);
96u64 btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
97 struct btrfs_delayed_ref_root *delayed_refs,
98 struct btrfs_delayed_ref_head *head);
99int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
100int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
101 struct btrfs_fs_info *fs_info, u64 bytenr,
102 u64 offset, int metadata, u64 *refs, u64 *flags);
103int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
104 int reserved);
105int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
106 const struct extent_buffer *eb);
107int btrfs_exclude_logged_extents(struct extent_buffer *eb);
108int btrfs_cross_ref_exist(struct btrfs_root *root,
109 u64 objectid, u64 offset, u64 bytenr, bool strict,
110 struct btrfs_path *path);
111struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
112 struct btrfs_root *root,
113 u64 parent, u64 root_objectid,
114 const struct btrfs_disk_key *key,
115 int level, u64 hint,
116 u64 empty_size,
117 u64 reloc_src_root,
118 enum btrfs_lock_nesting nest);
119void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
120 u64 root_id,
121 struct extent_buffer *buf,
122 u64 parent, int last_ref);
123int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
124 struct btrfs_root *root, u64 owner,
125 u64 offset, u64 ram_bytes,
126 struct btrfs_key *ins);
127int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
128 u64 root_objectid, u64 owner, u64 offset,
129 struct btrfs_key *ins);
130int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
131 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
132 struct btrfs_key *ins, int is_data, int delalloc);
133int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
134 struct extent_buffer *buf, int full_backref);
135int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
136 struct extent_buffer *buf, int full_backref);
137int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
138 struct extent_buffer *eb, u64 flags);
139int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
140
141u64 btrfs_get_extent_owner_root(struct btrfs_fs_info *fs_info,
142 struct extent_buffer *leaf, int slot);
143int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
144 u64 start, u64 len, int delalloc);
145int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans,
146 const struct extent_buffer *eb);
147int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
148int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, struct btrfs_ref *generic_ref);
149int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
150 int for_reloc);
151int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
152 struct btrfs_root *root,
153 struct extent_buffer *node,
154 struct extent_buffer *parent);
155
156#endif
157

source code of linux/fs/btrfs/extent-tree.h