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package storage
import (
"fmt"
"os"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/storage/backend"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/storage/super_block"
)
func (v *Volume) maybeWriteSuperBlock() error {
datSize, _, e := v.DataBackend.GetStat()
if e != nil {
glog.V(0).Infof("failed to stat datafile %s: %v", v.DataBackend.Name(), e)
return e
}
if datSize == 0 {
v.SuperBlock.Version = needle.CurrentVersion
_, e = v.DataBackend.WriteAt(v.SuperBlock.Bytes(), 0)
if e != nil && os.IsPermission(e) {
//read-only, but zero length - recreate it!
var dataFile *os.File
if dataFile, e = os.Create(v.DataBackend.Name()); e == nil {
v.DataBackend = backend.NewDiskFile(dataFile)
if _, e = v.DataBackend.WriteAt(v.SuperBlock.Bytes(), 0); e == nil {
v.noWriteOrDelete = false
v.noWriteCanDelete = false
}
}
}
}
return e
}
func (v *Volume) readSuperBlock() (err error) {
v.SuperBlock, err = super_block.ReadSuperBlock(v.DataBackend)
if v.volumeInfo != nil && v.volumeInfo.Replication != ""{
if replication, err := super_block.NewReplicaPlacementFromString(v.volumeInfo.Replication); err != nil {
return fmt.Errorf("Error parse volume %d replication %s : %v", v.Id, v.volumeInfo.Replication, err)
} else {
v.SuperBlock.ReplicaPlacement = replication
}
}
return err
}
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