func (s *streamSender) Run() error {
if err := s.prepare(); err != nil {
return err
}
if err := s.putHeader(&s.header); err != nil {
return err
}
if len(s.srcname) > 0 {
// always activate original lv so that target lv can be activated later
if err := lvmutil.ActivateLv(s.vgname, s.srcname); err != nil {
return err
}
defer lvmutil.DeactivateLv(s.vgname, s.srcname)
}
if err := lvmutil.ActivateLv(s.vgname, s.lvname); err != nil {
return err
}
defer lvmutil.DeactivateLv(s.vgname, s.lvname)
devpath := lvmutil.LvDevicePath(s.vgname, s.lvname)
devFile, err := directio.OpenFile(devpath, os.O_RDONLY, 0644)
if err != nil {
return err
}
defer devFile.Close()
buf := directio.AlignedBlock(int(s.header.BlockSize))
blockSize := int64(s.header.BlockSize)
for _, e := range s.blocks {
if e.OpType == thindump.DeltaOpDelete {
for i := 0; i < len(buf); i++ {
buf[i] = 0
}
} else {
if _, err := devFile.Seek(e.OriginBlock*blockSize, os.SEEK_SET); err != nil {
return err
}
if _, err := io.ReadFull(devFile, buf); err != nil {
return err
}
}
if err := s.putBlock(e.OriginBlock, buf); err != nil {
return err
}
}
return nil
}
func (sr *streamRecver) recvNextStream() error {
if err := sr.prepare(); err != nil {
return err
}
devpath := lvmutil.LvDevicePath(sr.vgname, sr.lvname)
devFile, err := directio.OpenFile(devpath, os.O_WRONLY, 0644)
if err != nil {
return err
}
defer devFile.Close()
n := 8 + sr.header.BlockSize
b := make([]byte, n+md5.Size)
buf := directio.AlignedBlock(int(sr.header.BlockSize))
for i := uint64(0); i < sr.header.BlockCount; i++ {
if _, err := io.ReadFull(sr.r, b); err != nil {
return err
}
sr.h.Reset()
sr.h.Write(b[:n])
if !bytes.Equal(sr.h.Sum(nil), b[n:n+md5.Size]) {
return fmt.Errorf("check sum mismatch for %dst block", i)
}
index := int64(binary.BigEndian.Uint64(b))
copy(buf, b[8:n])
if _, err := devFile.Seek(int64(sr.header.BlockSize)*index, os.SEEK_SET); err != nil {
return err
}
if _, err := devFile.Write(buf); err != nil {
return err
}
}
sr.prevUUID = string(sr.header.VolumeUUID[:])
return nil
}
func (s *streamSender) prepare() error {
root, err := vgcfg.Dump(s.vgname)
if err != nil {
return err
}
var lv, srclv *vgcfg.ThinLvInfo
var ok bool
lv, ok = root.FindThinLv(s.lvname)
if !ok {
return errors.New("can not find thin lv " + s.lvname)
}
if len(s.srcname) > 0 {
srclv, ok = root.FindThinLv(s.srcname)
if !ok {
return errors.New("can not find thin lv " + s.srcname)
}
}
if srclv != nil && lv.Pool != srclv.Pool {
return errors.New("thin volumes must in same pool for delta backup")
}
pool, ok := root.FindThinPool(lv.Pool)
if !ok {
return errors.New("can not find thin pool " + lv.Pool)
}
// dump block mapping
tpoolDev := lvmutil.TPoolDevicePath(s.vgname, pool.Name)
tmetaDev := lvmutil.LvDevicePath(s.vgname, pool.MetaName)
superblk, err := thindump.Dump(tpoolDev, tmetaDev)
if err != nil {
return err
}
var dev, srcdev *thindump.Device
dev, ok = superblk.FindDevice(lv.DeviceId)
if !ok {
return errors.New("super block do not have device " + string(lv.DeviceId))
}
if srclv != nil {
srcdev, ok = superblk.FindDevice(srclv.DeviceId)
if !ok {
return errors.New("super block do not have device " + string(srclv.DeviceId))
}
}
// list all blocks for full backup, or find changed blocks by comparing block
// mappings for incremental backup.
deltas, err := thindump.CompareDeviceBlocks(srcdev, dev)
if err != nil {
return err
}
s.blocks = deltas
s.header.SchemeVersion = StreamSchemeV1
s.header.StreamType = StreamTypeFull
s.header.VolumeSize = uint64(lv.ExtentCount) * uint64(root.ExtentSize())
s.header.BlockSize = uint32(pool.ChunkSize)
s.header.BlockCount = uint64(len(s.blocks))
copy(s.header.VolumeUUID[:], []byte(lv.UUID))
if srclv != nil {
s.header.StreamType = StreamTypeDelta
copy(s.header.DeltaSourceUUID[:], []byte(srclv.UUID))
}
return nil
}
