1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsprim
import (
"fmt"
)
type ObjID uint64
const maxUint64pp = 0x1_00000000_00000000
const (
// The IDs of the various trees
ROOT_TREE_OBJECTID = ObjID(1) // holds pointers to all of the tree roots
EXTENT_TREE_OBJECTID = ObjID(2) // stores information about which extents are in use, and reference counts
CHUNK_TREE_OBJECTID = ObjID(3) // chunk tree stores translations from logical -> physical block numbering
DEV_TREE_OBJECTID = ObjID(4) // stores info about which areas of a given device are in use; one per device
FS_TREE_OBJECTID = ObjID(5) // one per subvolume, storing files and directories
ROOT_TREE_DIR_OBJECTID = ObjID(6) // directory objectid inside the root tree
CSUM_TREE_OBJECTID = ObjID(7) // holds checksums of all the data extents
QUOTA_TREE_OBJECTID = ObjID(8)
UUID_TREE_OBJECTID = ObjID(9) // for storing items that use the UUID_*_KEY
FREE_SPACE_TREE_OBJECTID = ObjID(10) // tracks free space in block groups.
BLOCK_GROUP_TREE_OBJECTID = ObjID(11) // hold the block group items.
// Objects in the DEV_TREE
DEV_STATS_OBJECTID = ObjID(0) // device stats in the device tree
// ???
BALANCE_OBJECTID = ObjID(maxUint64pp - 4) // for storing balance parameters in the root tree
ORPHAN_OBJECTID = ObjID(maxUint64pp - 5) // orphan objectid for tracking unlinked/truncated files
TREE_LOG_OBJECTID = ObjID(maxUint64pp - 6) // does write ahead logging to speed up fsyncs
TREE_LOG_FIXUP_OBJECTID = ObjID(maxUint64pp - 7)
TREE_RELOC_OBJECTID = ObjID(maxUint64pp - 8) // space balancing
DATA_RELOC_TREE_OBJECTID = ObjID(maxUint64pp - 9)
EXTENT_CSUM_OBJECTID = ObjID(maxUint64pp - 10) // extent checksums all have this objectid
FREE_SPACE_OBJECTID = ObjID(maxUint64pp - 11) // For storing free space cache
FREE_INO_OBJECTID = ObjID(maxUint64pp - 12) // stores the inode number for the free-ino cache
MULTIPLE_OBJECTIDS = ObjID(maxUint64pp - 255) // dummy objectid represents multiple objectids
// All files have objectids in this range.
FIRST_FREE_OBJECTID = ObjID(256)
LAST_FREE_OBJECTID = ObjID(maxUint64pp - 256)
FIRST_CHUNK_TREE_OBJECTID = ObjID(256)
// Objects in the CHUNK_TREE
DEV_ITEMS_OBJECTID = ObjID(1)
// ???
EMPTY_SUBVOL_DIR_OBJECTID = ObjID(2)
)
func (id ObjID) Format(typ ItemType) string {
switch typ {
case PERSISTENT_ITEM_KEY:
names := map[ObjID]string{
DEV_STATS_OBJECTID: "DEV_STATS",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
case DEV_EXTENT_KEY:
return fmt.Sprintf("%d", int64(id))
case QGROUP_RELATION_KEY:
//nolint:gomnd // TODO: I'm not sure what the 48/16 bit split means.
return fmt.Sprintf("%d/%d",
uint64(id)>>48,
uint64(id)&((1<<48)-1))
case UUID_SUBVOL_KEY, UUID_RECEIVED_SUBVOL_KEY:
return fmt.Sprintf("%#016x", uint64(id))
case DEV_ITEM_KEY:
names := map[ObjID]string{
BALANCE_OBJECTID: "BALANCE",
ORPHAN_OBJECTID: "ORPHAN",
TREE_LOG_OBJECTID: "TREE_LOG",
TREE_LOG_FIXUP_OBJECTID: "TREE_LOG_FIXUP",
TREE_RELOC_OBJECTID: "TREE_RELOC",
DATA_RELOC_TREE_OBJECTID: "DATA_RELOC_TREE",
EXTENT_CSUM_OBJECTID: "EXTENT_CSUM",
FREE_SPACE_OBJECTID: "FREE_SPACE",
FREE_INO_OBJECTID: "FREE_INO",
MULTIPLE_OBJECTIDS: "MULTIPLE",
DEV_ITEMS_OBJECTID: "DEV_ITEMS",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
case CHUNK_ITEM_KEY:
names := map[ObjID]string{
BALANCE_OBJECTID: "BALANCE",
ORPHAN_OBJECTID: "ORPHAN",
TREE_LOG_OBJECTID: "TREE_LOG",
TREE_LOG_FIXUP_OBJECTID: "TREE_LOG_FIXUP",
TREE_RELOC_OBJECTID: "TREE_RELOC",
DATA_RELOC_TREE_OBJECTID: "DATA_RELOC_TREE",
EXTENT_CSUM_OBJECTID: "EXTENT_CSUM",
FREE_SPACE_OBJECTID: "FREE_SPACE",
FREE_INO_OBJECTID: "FREE_INO",
MULTIPLE_OBJECTIDS: "MULTIPLE",
FIRST_CHUNK_TREE_OBJECTID: "FIRST_CHUNK_TREE",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
default:
names := map[ObjID]string{
BALANCE_OBJECTID: "BALANCE",
ORPHAN_OBJECTID: "ORPHAN",
TREE_LOG_OBJECTID: "TREE_LOG",
TREE_LOG_FIXUP_OBJECTID: "TREE_LOG_FIXUP",
TREE_RELOC_OBJECTID: "TREE_RELOC",
DATA_RELOC_TREE_OBJECTID: "DATA_RELOC_TREE",
EXTENT_CSUM_OBJECTID: "EXTENT_CSUM",
FREE_SPACE_OBJECTID: "FREE_SPACE",
FREE_INO_OBJECTID: "FREE_INO",
MULTIPLE_OBJECTIDS: "MULTIPLE",
ROOT_TREE_OBJECTID: "ROOT_TREE",
EXTENT_TREE_OBJECTID: "EXTENT_TREE",
CHUNK_TREE_OBJECTID: "CHUNK_TREE",
DEV_TREE_OBJECTID: "DEV_TREE",
FS_TREE_OBJECTID: "FS_TREE",
ROOT_TREE_DIR_OBJECTID: "ROOT_TREE_DIR",
CSUM_TREE_OBJECTID: "CSUM_TREE",
QUOTA_TREE_OBJECTID: "QUOTA_TREE",
UUID_TREE_OBJECTID: "UUID_TREE",
FREE_SPACE_TREE_OBJECTID: "FREE_SPACE_TREE",
BLOCK_GROUP_TREE_OBJECTID: "BLOCK_GROUP_TREE",
}
if name, ok := names[id]; ok {
return name
}
return fmt.Sprintf("%d", int64(id))
}
}
func (id ObjID) String() string {
return id.Format(UNTYPED_KEY)
}
|
