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package btrfsitem
import (
"lukeshu.com/btrfs-tools/pkg/binstruct"
"lukeshu.com/btrfs-tools/pkg/btrfs/internal"
)
type Chunk struct { // CHUNK_ITEM=228
// Maps logical address to physical.
Size uint64 `bin:"off=0x0, siz=0x8"` // size of chunk (bytes)
Owner internal.ObjID `bin:"off=0x8, siz=0x8"` // root referencing this chunk (2)
StripeLen uint64 `bin:"off=0x10, siz=0x8"` // stripe length
Type uint64 `bin:"off=0x18, siz=0x8"` // type (same as flags for block group?)
IOOptimalAlign uint32 `bin:"off=0x20, siz=0x4"` // optimal io alignment
IOOptimalWidth uint32 `bin:"off=0x24, siz=0x4"` // optimal io width
IoMinSize uint32 `bin:"off=0x28, siz=0x4"` // minimal io size (sector size)
NumStripes uint16 `bin:"off=0x2c, siz=0x2"` // number of stripes
SubStripes uint16 `bin:"off=0x2e, siz=0x2"` // sub stripes
binstruct.End `bin:"off=0x30"`
Stripes []ChunkStripe `bin:"-"`
}
type ChunkStripe struct {
// Stripes follow (for each number of stripes):
DeviceID internal.ObjID `bin:"off=0, siz=8"` // device ID
Offset uint64 `bin:"off=8, siz=8"` // offset
DeviceUUID internal.UUID `bin:"off=10, siz=10"` // device UUID
binstruct.End `bin:"off=20"`
}
func (chunk *Chunk) UnmarshalBinary(dat []byte) (int, error) {
n, err := binstruct.UnmarshalWithoutInterface(dat, chunk)
if err != nil {
return n, err
}
for i := 0; i < int(chunk.NumStripes); i++ {
var stripe ChunkStripe
_n, err := binstruct.Unmarshal(dat[n:], &stripe)
n += _n
if err != nil {
return n, err
}
chunk.Stripes = append(chunk.Stripes, stripe)
}
return n, nil
}
func (chunk Chunk) MarshalBinary() ([]byte, error) {
chunk.NumStripes = uint16(len(chunk.Stripes))
ret, err := binstruct.MarshalWithoutInterface(chunk)
if err != nil {
return ret, err
}
for _, stripe := range chunk.Stripes {
_ret, err := binstruct.Marshal(stripe)
ret = append(ret, _ret...)
if err != nil {
return ret, err
}
}
return ret, nil
}
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