diff options
Diffstat (limited to 'pkg/btrfs/types_structs.go')
| -rw-r--r-- | pkg/btrfs/types_structs.go | 43 |
1 files changed, 35 insertions, 8 deletions
diff --git a/pkg/btrfs/types_structs.go b/pkg/btrfs/types_structs.go index 6ab3b93..5063d86 100644 --- a/pkg/btrfs/types_structs.go +++ b/pkg/btrfs/types_structs.go @@ -77,9 +77,9 @@ type Superblock struct { NumGlobalRoots uint64 `bin:"off=24b, siz=8"` // FeatureIncompatExtentTreeV2 - BlockGroupRoot ObjID `bin:"off=253, siz=8"` - BlockGroupRootGeneration Generation `bin:"off=25b, siz=8"` - BlockGroupRootLevel uint8 `bin:"off=263, siz=1"` + BlockGroupRoot LogicalAddr `bin:"off=253, siz=8"` + BlockGroupRootGeneration Generation `bin:"off=25b, siz=8"` + BlockGroupRootLevel uint8 `bin:"off=263, siz=1"` Reserved [199]byte `bin:"off=264, siz=c7"` // future expansion @@ -195,22 +195,34 @@ type RootBackup struct { binstruct.End `bin:"off=a8"` } +type Node interface { + GetNodeHeader() Ref[LogicalAddr, NodeHeader] +} + type NodeHeader struct { Checksum CSum `bin:"off=0, siz=20"` // Checksum of everything after this field (from 20 to the end of the node) MetadataUUID UUID `bin:"off=20, siz=10"` // FS UUID Addr LogicalAddr `bin:"off=30, siz=8"` // Logical address of this node - Flags uint64 `bin:"off=38, siz=8"` // Flags + Flags NodeFlags `bin:"off=38, siz=7"` + BackrefRev uint8 `bin:"off=3f, siz=1"` ChunkTreeUUID UUID `bin:"off=40, siz=10"` // Chunk tree UUID Generation Generation `bin:"off=50, siz=8"` // Generation Owner TreeObjID `bin:"off=58, siz=8"` // The ID of the tree that contains this node NumItems uint32 `bin:"off=60, siz=4"` // Number of items Level uint8 `bin:"off=64, siz=1"` // Level (0 for leaf nodes) binstruct.End `bin:"off=65"` + + Size uint32 `bin:"-"` // superblock.NodeSize + MaxItems uint32 `bin:"-"` // Maximum possible value of NumItems } type InternalNode struct { - NodeHeader - Body []KeyPointer + Header Ref[LogicalAddr, NodeHeader] + Body []Ref[LogicalAddr, KeyPointer] +} + +func (in *InternalNode) GetNodeHeader() Ref[LogicalAddr, NodeHeader] { + return in.Header } type KeyPointer struct { @@ -221,8 +233,22 @@ type KeyPointer struct { } type LeafNode struct { - NodeHeader - Body []Item + Header Ref[LogicalAddr, NodeHeader] + Body []Ref[LogicalAddr, Item] +} + +func (ln *LeafNode) GetNodeHeader() Ref[LogicalAddr, NodeHeader] { + return ln.Header +} + +func (ln *LeafNode) FreeSpace() uint32 { + freeSpace := ln.Header.Data.Size + freeSpace -= 0x65 + for _, item := range ln.Body { + freeSpace -= 0x19 + freeSpace -= item.Data.DataSize + } + return freeSpace } type Item struct { @@ -230,6 +256,7 @@ type Item struct { DataOffset uint32 `bin:"off=11, siz=4"` // relative to the end of the header (0x65) DataSize uint32 `bin:"off=15, siz=4"` binstruct.End `bin:"off=19"` + Data Ref[LogicalAddr, []byte] `bin:"-"` } type DevItem struct { |