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Add compact revision in volume super block

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chrislusf 2015-05-08 23:34:14 -07:00
parent 98d4adbb8a
commit dac3b592ed
1 changed files with 5 additions and 0 deletions
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5
go/storage/volume_super_block.go
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@ -5,6 +5,7 @@ import (
"os" "os"
"github.com/chrislusf/seaweedfs/go/glog" "github.com/chrislusf/seaweedfs/go/glog"
"github.com/chrislusf/seaweedfs/go/util"
) )
const ( const (
@ -16,12 +17,14 @@ const (
* Byte 0: version, 1 or 2 * Byte 0: version, 1 or 2
* Byte 1: Replica Placement strategy, 000, 001, 002, 010, etc * Byte 1: Replica Placement strategy, 000, 001, 002, 010, etc
* Byte 2 and byte 3: Time to live. See TTL for definition * Byte 2 and byte 3: Time to live. See TTL for definition
* Byte 4 and byte 5: The number of times the volume has been compacted.
* Rest bytes: Reserved * Rest bytes: Reserved
*/ */
type SuperBlock struct { type SuperBlock struct {
version Version version Version
ReplicaPlacement *ReplicaPlacement ReplicaPlacement *ReplicaPlacement
Ttl *TTL Ttl *TTL
CompactRevision uint16
} }
func (s *SuperBlock) Version() Version { func (s *SuperBlock) Version() Version {
@ -32,6 +35,7 @@ func (s *SuperBlock) Bytes() []byte {
header[0] = byte(s.version) header[0] = byte(s.version)
header[1] = s.ReplicaPlacement.Byte() header[1] = s.ReplicaPlacement.Byte()
s.Ttl.ToBytes(header[2:4]) s.Ttl.ToBytes(header[2:4])
util.Uint16toBytes(header[4:6], s.CompactRevision)
return header return header
} }
@ -72,5 +76,6 @@ func ParseSuperBlock(header []byte) (superBlock SuperBlock, err error) {
err = fmt.Errorf("cannot read replica type: %s", err.Error()) err = fmt.Errorf("cannot read replica type: %s", err.Error())
} }
superBlock.Ttl = LoadTTLFromBytes(header[2:4]) superBlock.Ttl = LoadTTLFromBytes(header[2:4])
superBlock.CompactRevision = util.BytesToUint16(header[4:6])
return return
} }