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
|
package main
import (
"lukeshu.com/btrfs-tools/pkg/binstruct"
)
type (
PhysicalAddr int64
LogicalAddr int64
UUID [16]byte
)
type Superblock struct {
Checksum [0x20]byte `bin:"off=0, siz=20, desc=Checksum of everything past this field (from 20 to 1000)"`
FSUUID UUID `bin:"off=20, siz=10, desc=FS UUID"`
Self PhysicalAddr `bin:"off=30, siz=8, desc=physical address of this block (different for mirrors)"`
Flags uint64 `bin:"off=38, siz=8, desc=flags"`
Magic [8]byte `bin:"off=40, siz=8, desc=magic ('_BHRfS_M')"`
Generation uint64 `bin:"off=48, siz=8, desc=generation"`
RootTree LogicalAddr `bin:"off=50, siz=8, desc=logical address of the root tree root"`
ChunkTree LogicalAddr `bin:"off=58, siz=8, desc=logical address of the chunk tree root"`
LogTree LogicalAddr `bin:"off=60, siz=8, desc=logical address of the log tree root"`
LogRootTransID uint64 `bin:"off=68, siz=8, desc=log_root_transid"`
TotalBytes uint64 `bin:"off=70, siz=8, desc=total_bytes"`
BytesUsed uint64 `bin:"off=78, siz=8, desc=bytes_used"`
RootDirObjectID uint64 `bin:"off=80, siz=8, desc=root_dir_objectid (usually 6)"`
NumDevices uint64 `bin:"off=88, siz=8, desc=num_devices"`
SectorSize uint32 `bin:"off=90, siz=4, desc=sectorsize"`
NodeSize uint32 `bin:"off=94, siz=4, desc=nodesize"`
LeafSize uint32 `bin:"off=98, siz=4, desc=leafsize"`
StripeSize uint32 `bin:"off=9c, siz=4, desc=stripesize"`
SysChunkArraySize uint32 `bin:"off=a0, siz=4, desc=sys_chunk_array_size"`
ChunkRootGeneration uint64 `bin:"off=a4, siz=8, desc=chunk_root_generation"`
CompatFlags uint64 `bin:"off=ac, siz=8, desc=compat_flags"`
CompatROFlags uint64 `bin:"off=b4, siz=8, desc=compat_ro_flags - only implementations that support the flags can write to the filesystem"`
IncompatFlags uint64 `bin:"off=bc, siz=8, desc=incompat_flags - only implementations that support the flags can use the filesystem"`
ChecksumType uint16 `bin:"off=c4, siz=2, desc=csum_type - Btrfs currently uses the CRC32c little-endian hash function with seed -1."`
RootLevel uint8 `bin:"off=c6, siz=1, desc=root_level"`
ChunkLevel uint8 `bin:"off=c7, siz=1, desc=chunk_root_level"`
LogLevel uint8 `bin:"off=c8, siz=1, desc=log_root_level"`
DevItem DevItem `bin:"off=c9, siz=62, desc=DEV_ITEM data for this device"`
Label [0x100]byte `bin:"off=12b, siz=100, desc=label (may not contain '/' or '\\')"`
CacheGeneration uint64 `bin:"off=22b, siz=8, desc=cache_generation"`
UUIDTreeGeneration uint64 `bin:"off=233, siz=8, desc=uuid_tree_generation"`
Reserved [0xf0]byte `bin:"off=23b, siz=f0, desc=reserved /* future expansion */"`
SysChunkArray [0x800]byte `bin:"off=32b, siz=800, desc=sys_chunk_array:(n bytes valid) Contains (KEY . CHUNK_ITEM) pairs for all SYSTEM chunks. This is needed to bootstrap the mapping from logical addresses to physical. "`
SuperRoots [0x2a0]byte `bin:"off=b2b, siz=2a0, desc=Contain super_roots (4 btrfs_root_backup)"`
Unused [0x235]byte `bin:"off=dcb, siz=235, desc=current unused"`
binstruct.End `bin:"off=1000"`
}
type DevItem struct {
DeviceID uint64 `bin:"off=0, siz=8, desc=device id"`
NumBytes uint64 `bin:"off=8, siz=8, desc=number of bytes"`
NumBytesUsed uint64 `bin:"off=10, siz=8, desc=number of bytes used"`
IOOptimalAlign uint32 `bin:"off=18, siz=4, desc=optimal I/O align"`
IOOptimalWidth uint32 `bin:"off=1c, siz=4, desc=optimal I/O width"`
IOMinSize uint32 `bin:"off=20, siz=4, desc=minimal I/O size (sector size)"`
Type uint64 `bin:"off=24, siz=8, desc=type"`
Generation uint64 `bin:"off=2c, siz=8, desc=generation"`
StartOffset uint64 `bin:"off=34, siz=8, desc=start offset"`
DevGroup uint32 `bin:"off=3c, siz=4, desc=dev group"`
SeekSpeed uint8 `bin:"off=40, siz=1, desc=seek speed"`
Bandwidth uint8 `bin:"off=41, siz=1, desc=bandwidth"`
DevUUID UUID `bin:"off=42, siz=10, desc=device UUID"`
FSUUID UUID `bin:"off=52, siz=10, desc=FS UUID"`
binstruct.End `bin:"off=62"`
}
|
