diff options
Diffstat (limited to 'pkg/btrfs/types.go')
| -rw-r--r-- | pkg/btrfs/types.go | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/pkg/btrfs/types.go b/pkg/btrfs/types.go deleted file mode 100644 index a91708e..0000000 --- a/pkg/btrfs/types.go +++ /dev/null @@ -1,163 +0,0 @@ -package btrfs - -import ( - "time" - - "lukeshu.com/btrfs-tools/pkg/binstruct" -) - -type ( - PhysicalAddr int64 - LogicalAddr int64 - ObjID int64 -) - -type Key struct { - ObjectID ObjID `bin:"off=0, siz=8"` // Object ID. Each tree has its own set of Object IDs. - ItemType uint8 `bin:"off=8, siz=1"` // Item type. - Offset uint64 `bin:"off=9, siz=8"` // Offset. The meaning depends on the item type. - binstruct.End `bin:"off=11"` -} - -type Time struct { - Sec int64 `bin:"off=0, siz=8"` // Number of seconds since 1970-01-01T00:00:00Z. - NSec uint64 `bin:"off=8, siz=4"` // Number of nanoseconds since the beginning of the second. - binstruct.End `bin:"off=c"` -} - -func (t Time) ToStd() time.Time { - return time.Unix(t.Sec, int64(t.NSec)) -} - -type Superblock struct { - Checksum CSum `bin:"off=0, siz=20"` // Checksum of everything past this field (from 20 to 1000) - FSUUID UUID `bin:"off=20, siz=10"` // FS UUID - Self PhysicalAddr `bin:"off=30, siz=8"` // physical address of this block (different for mirrors) - Flags uint64 `bin:"off=38, siz=8"` // flags - Magic [8]byte `bin:"off=40, siz=8"` // magic ('_BHRfS_M') - Generation uint64 `bin:"off=48, siz=8"` // generation - - RootTree LogicalAddr `bin:"off=50, siz=8"` // logical address of the root tree root - ChunkTree LogicalAddr `bin:"off=58, siz=8"` // logical address of the chunk tree root - LogTree LogicalAddr `bin:"off=60, siz=8"` // logical address of the log tree root - - LogRootTransID uint64 `bin:"off=68, siz=8"` // log_root_transid - TotalBytes uint64 `bin:"off=70, siz=8"` // total_bytes - BytesUsed uint64 `bin:"off=78, siz=8"` // bytes_used - RootDirObjectID uint64 `bin:"off=80, siz=8"` // root_dir_objectid (usually 6) - NumDevices uint64 `bin:"off=88, siz=8"` // num_devices - - SectorSize uint32 `bin:"off=90, siz=4"` // sectorsize - NodeSize uint32 `bin:"off=94, siz=4"` // nodesize - LeafSize uint32 `bin:"off=98, siz=4"` // leafsize - StripeSize uint32 `bin:"off=9c, siz=4"` // stripesize - SysChunkArraySize uint32 `bin:"off=a0, siz=4"` // sys_chunk_array_size - - ChunkRootGeneration uint64 `bin:"off=a4, siz=8"` // chunk_root_generation - CompatFlags uint64 `bin:"off=ac, siz=8"` // compat_flags - CompatROFlags uint64 `bin:"off=b4, siz=8"` // compat_ro_flags - only implementations that support the flags can write to the filesystem - IncompatFlags uint64 `bin:"off=bc, siz=8"` // incompat_flags - only implementations that support the flags can use the filesystem - ChecksumType uint16 `bin:"off=c4, siz=2"` // csum_type - Btrfs currently uses the CRC32c little-endian hash function with seed -1. - - RootLevel uint8 `bin:"off=c6, siz=1"` // root_level - ChunkLevel uint8 `bin:"off=c7, siz=1"` // chunk_root_level - LogLevel uint8 `bin:"off=c8, siz=1"` // log_root_level - - DevItem DevItem `bin:"off=c9, siz=62"` // DEV_ITEM data for this device - Label [0x100]byte `bin:"off=12b, siz=100"` // label (may not contain '/' or '\\') - CacheGeneration uint64 `bin:"off=22b, siz=8"` // cache_generation - UUIDTreeGeneration uint64 `bin:"off=233, siz=8"` // uuid_tree_generation - - Reserved [0xf0]byte `bin:"off=23b, siz=f0"` // reserved /* future expansion */ - - SysChunkArray [0x800]byte `bin:"off=32b, siz=800"` // 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. - TODOSuperRoots [0x2a0]byte `bin:"off=b2b, siz=2a0"` // Contain super_roots (4 btrfs_root_backup) - - Unused [0x235]byte `bin:"off=dcb, siz=235"` // current unused - - binstruct.End `bin:"off=1000"` -} - -func (sb Superblock) CalculateChecksum() (CSum, error) { - data, err := binstruct.Marshal(sb) - if err != nil { - return CSum{}, err - } - return CRC32c(data[0x20:]), nil -} - -type SysChunk struct { - Key `bin:"off=0, siz=11"` - ChunkItem `bin:"off=11, siz=30"` - binstruct.End `bin:"off=41"` -} - -func (sb Superblock) ParseSysChunkArray() ([]SysChunk, error) { - dat := sb.SysChunkArray[:sb.SysChunkArraySize] - var ret []SysChunk - for len(dat) > 0 { - var pair SysChunk - if err := binstruct.Unmarshal(dat, &pair); err != nil { - return nil, err - } - dat = dat[0x41:] - - for i := 0; i < int(pair.ChunkItem.NumStripes); i++ { - var stripe ChunkItemStripe - if err := binstruct.Unmarshal(dat, &stripe); err != nil { - return nil, err - } - pair.ChunkItem.Stripes = append(pair.ChunkItem.Stripes, stripe) - dat = dat[0x20:] - } - - ret = append(ret, pair) - } - return ret, nil -} - -type DevItem struct { - DeviceID uint64 `bin:"off=0, siz=8"` // device id - - NumBytes uint64 `bin:"off=8, siz=8"` // number of bytes - NumBytesUsed uint64 `bin:"off=10, siz=8"` // number of bytes used - - IOOptimalAlign uint32 `bin:"off=18, siz=4"` // optimal I/O align - IOOptimalWidth uint32 `bin:"off=1c, siz=4"` // optimal I/O width - IOMinSize uint32 `bin:"off=20, siz=4"` // minimal I/O size (sector size) - - Type uint64 `bin:"off=24, siz=8"` // type - Generation uint64 `bin:"off=2c, siz=8"` // generation - StartOffset uint64 `bin:"off=34, siz=8"` // start offset - DevGroup uint32 `bin:"off=3c, siz=4"` // dev group - SeekSpeed uint8 `bin:"off=40, siz=1"` // seek speed - Bandwidth uint8 `bin:"off=41, siz=1"` // bandwidth - - DevUUID UUID `bin:"off=42, siz=10"` // device UUID - FSUUID UUID `bin:"off=52, siz=10"` // FS UUID - - binstruct.End `bin:"off=62"` -} - -type ChunkItem struct { - // Maps logical address to physical. - Size uint64 `bin:"off=0, siz=8"` // size of chunk (bytes) - Root ObjID `bin:"off=8, siz=8"` // root referencing this chunk (2) - StripeLen uint64 `bin:"off=10, siz=8"` // stripe length - Type uint64 `bin:"off=18, siz=8"` // type (same as flags for block group?) - IOOptimalAlign uint32 `bin:"off=20, siz=4"` // optimal io alignment - IOOptimalWidth uint32 `bin:"off=24, siz=4"` // optimal io width - IoMinSize uint32 `bin:"off=28, siz=4"` // minimal io size (sector size) - NumStripes uint16 `bin:"off=2c, siz=2"` // number of stripes - SubStripes uint16 `bin:"off=2e, siz=2"` // sub stripes - binstruct.End `bin:"off=30"` - Stripes []ChunkItemStripe `bin:"-"` -} - -type ChunkItemStripe struct { - // Stripes follow (for each number of stripes): - DeviceID ObjID `bin:"off=0, siz=8"` // device id - Offset uint64 `bin:"off=8, siz=8"` // offset - DeviceUUID UUID `bin:"off=10, siz=10"` // device UUID - binstruct.End `bin:"off=20"` -} |