diff options
author | Luke Shumaker <lukeshu@lukeshu.com> | 2022-05-10 04:46:06 -0600 |
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committer | Luke Shumaker <lukeshu@lukeshu.com> | 2022-05-10 04:46:06 -0600 |
commit | 2744e0700ca6fe956f569d47010fd4e693fedcfa (patch) | |
tree | 17cc6eb920ece3700a10a86ed465d4a0947d32c4 /cmd/btrfs-dbg | |
parent | a16049ef805c0c08b90885a5b7dfea7f74e51c5f (diff) |
more
Diffstat (limited to 'cmd/btrfs-dbg')
-rw-r--r-- | cmd/btrfs-dbg/main.go | 8 | ||||
-rw-r--r-- | cmd/btrfs-dbg/types.go | 48 |
2 files changed, 51 insertions, 5 deletions
diff --git a/cmd/btrfs-dbg/main.go b/cmd/btrfs-dbg/main.go index 8758cd0..d6c9c68 100644 --- a/cmd/btrfs-dbg/main.go +++ b/cmd/btrfs-dbg/main.go @@ -4,6 +4,8 @@ import ( "fmt" "os" + "github.com/davecgh/go-spew/spew" + "lukeshu.com/btrfs-tools/pkg/binstruct" ) @@ -36,7 +38,11 @@ func Main(imgfilename string) (err error) { if err != nil { return err } - fmt.Printf("%#v\n", superblocks[0]) + + spew := spew.NewDefaultConfig() + spew.DisablePointerAddresses = true + + spew.Dump(superblocks[0].data) return nil } diff --git a/cmd/btrfs-dbg/types.go b/cmd/btrfs-dbg/types.go index 33f78ba..699f1a2 100644 --- a/cmd/btrfs-dbg/types.go +++ b/cmd/btrfs-dbg/types.go @@ -1,15 +1,30 @@ package main import ( + "encoding/hex" + "strings" + "lukeshu.com/btrfs-tools/pkg/binstruct" ) type ( PhysicalAddr int64 LogicalAddr int64 + ObjID int64 UUID [16]byte ) +func (uuid UUID) String() string { + str := hex.EncodeToString(uuid[:]) + return strings.Join([]string{ + str[:8], + str[8:12], + str[12:16], + str[16:20], + str[20:32], + }, "-") +} + 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"` @@ -48,10 +63,13 @@ type Superblock struct { 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"` + + Reserved [0xf0]byte `bin:"off=23b, siz=f0, desc=reserved /* future expansion */"` + + TODOSysChunkArray [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. "` + TODOSuperRoots [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"` } @@ -78,3 +96,25 @@ type DevItem struct { binstruct.End `bin:"off=62"` } + +type ChunkItem struct { + // Maps logical address to physical. + Size uint64 `bin:"off=0, siz=8, desc=size of chunk (bytes)"` + Root ObjID `bin:"off=8, siz=8, desc=root referencing this chunk (2)"` + StripeLen uint64 `bin:"off=10, siz=8, desc=stripe length"` + Type uint64 `bin:"off=18, siz=8, desc=type (same as flags for block group?)"` + IOOptimalAlign uint32 `bin:"off=20, siz=4, desc=optimal io alignment"` + IOOptimalWidth uint32 `bin:"off=24, siz=4, desc=optimal io width"` + IoMinSize uint32 `bin:"off=28, siz=4, desc=minimal io size (sector size)"` + NumStripes uint16 `bin:"off=2c, siz=2, desc=number of stripes"` + SubStripes uint16 `bin:"off=2e, siz=2, desc=sub stripes"` + binstruct.End `bin:"off=30"` +} + +type ChunkItemStripe struct { + // Stripes follow (for each number of stripes): + DeviceID ObjID `bin:"off=0, siz=8, desc=device id"` + Offset uint64 `bin:"off=8, siz=8, desc=offset"` + DeviceUUID UUID `bin:"off=10, siz=10, desc=device UUID"` + binstruct.End `bin:"off=20"` +} |