1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef BTRFS_EXTENT_TREE_H
4 #define BTRFS_EXTENT_TREE_H
5
6 #include <linux/types.h>
7 #include "misc.h"
8 #include "block-group.h"
9 #include "locking.h"
10
11 struct extent_buffer;
12 struct btrfs_free_cluster;
13 struct btrfs_fs_info;
14 struct btrfs_root;
15 struct btrfs_path;
16 struct btrfs_ref;
17 struct btrfs_disk_key;
18 struct btrfs_delayed_ref_head;
19 struct btrfs_delayed_ref_root;
20 struct btrfs_extent_inline_ref;
21
22 enum btrfs_extent_allocation_policy {
23 BTRFS_EXTENT_ALLOC_CLUSTERED,
24 BTRFS_EXTENT_ALLOC_ZONED,
25 };
26
27 struct find_free_extent_ctl {
28 /* Basic allocation info */
29 u64 ram_bytes;
30 u64 num_bytes;
31 u64 min_alloc_size;
32 u64 empty_size;
33 u64 flags;
34 int delalloc;
35
36 /* Where to start the search inside the bg */
37 u64 search_start;
38
39 /* For clustered allocation */
40 u64 empty_cluster;
41 struct btrfs_free_cluster *last_ptr;
42 bool use_cluster;
43
44 bool have_caching_bg;
45 bool orig_have_caching_bg;
46
47 /* Allocation is called for tree-log */
48 bool for_treelog;
49
50 /* Allocation is called for data relocation */
51 bool for_data_reloc;
52
53 /* RAID index, converted from flags */
54 int index;
55
56 /*
57 * Current loop number, check find_free_extent_update_loop() for details
58 */
59 int loop;
60
61 /*
62 * Set to true if we're retrying the allocation on this block group
63 * after waiting for caching progress, this is so that we retry only
64 * once before moving on to another block group.
65 */
66 bool retry_uncached;
67
68 /* If current block group is cached */
69 int cached;
70
71 /* Max contiguous hole found */
72 u64 max_extent_size;
73
74 /* Total free space from free space cache, not always contiguous */
75 u64 total_free_space;
76
77 /* Found result */
78 u64 found_offset;
79
80 /* Hint where to start looking for an empty space */
81 u64 hint_byte;
82
83 /* Allocation policy */
84 enum btrfs_extent_allocation_policy policy;
85
86 /* Whether or not the allocator is currently following a hint */
87 bool hinted;
88
89 /* Size class of block groups to prefer in early loops */
90 enum btrfs_block_group_size_class size_class;
91 };
92
93 enum btrfs_inline_ref_type {
94 BTRFS_REF_TYPE_INVALID,
95 BTRFS_REF_TYPE_BLOCK,
96 BTRFS_REF_TYPE_DATA,
97 BTRFS_REF_TYPE_ANY,
98 };
99
100 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
101 struct btrfs_extent_inline_ref *iref,
102 enum btrfs_inline_ref_type is_data);
103 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
104
105 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, u64 min_bytes);
106 u64 btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
107 struct btrfs_delayed_ref_root *delayed_refs,
108 struct btrfs_delayed_ref_head *head);
109 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
110 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
111 struct btrfs_fs_info *fs_info, u64 bytenr,
112 u64 offset, int metadata, u64 *refs, u64 *flags,
113 u64 *owner_root);
114 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
115 int reserved);
116 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
117 const struct extent_buffer *eb);
118 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
119 int btrfs_cross_ref_exist(struct btrfs_root *root,
120 u64 objectid, u64 offset, u64 bytenr, bool strict,
121 struct btrfs_path *path);
122 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
123 struct btrfs_root *root,
124 u64 parent, u64 root_objectid,
125 const struct btrfs_disk_key *key,
126 int level, u64 hint,
127 u64 empty_size,
128 u64 reloc_src_root,
129 enum btrfs_lock_nesting nest);
130 int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
131 u64 root_id,
132 struct extent_buffer *buf,
133 u64 parent, int last_ref);
134 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
135 struct btrfs_root *root, u64 owner,
136 u64 offset, u64 ram_bytes,
137 struct btrfs_key *ins);
138 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
139 u64 root_objectid, u64 owner, u64 offset,
140 struct btrfs_key *ins);
141 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
142 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
143 struct btrfs_key *ins, int is_data, int delalloc);
144 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
145 struct extent_buffer *buf, int full_backref);
146 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
147 struct extent_buffer *buf, int full_backref);
148 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
149 struct extent_buffer *eb, u64 flags);
150 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
151
152 u64 btrfs_get_extent_owner_root(struct btrfs_fs_info *fs_info,
153 struct extent_buffer *leaf, int slot);
154 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
155 u64 start, u64 len, int delalloc);
156 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans,
157 const struct extent_buffer *eb);
158 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
159 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, struct btrfs_ref *generic_ref);
160 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
161 int for_reloc);
162 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
163 struct btrfs_root *root,
164 struct extent_buffer *node,
165 struct extent_buffer *parent);
166
167 #endif
168
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