func (c *checkPoint) Restore(r *bitmap.File) (err error) {
size := r.Size() // make sure is blksize-round
off := size - (size & int64(c.blkSize-1))
buf := make([]byte, 2)
for {
if off == 0 {
break
}
off -= int64(c.blkSize)
_, err = r.ReadAt(buf, off)
if err != nil {
return
}
if !bytes.Equal(buf, MagicBytes) {
continue
}
bio := utils.NewBufio(utils.NewReader(r, off+2))
if err = gob.NewDecoder(bio).Decode(&c.Data); err != nil {
logex.Error(err)
return
}
off = bio.Offset(-1)
break
}
// move offset to next blk
off = c.calFloor(off)
if c.Data == nil {
c.Data = make(map[string]int64)
}
updated := false
if off < size {
logex.Info("trying to resore ino into checkpoint")
}
bio := utils.NewBufio(utils.NewReader(r, off))
for off < size {
bio.Offset(off)
ino, err := ReadInode(bio, c.blkBit)
if err != nil {
if logex.Equal(err, io.EOF) {
break
}
off += int64(c.blkSize)
continue
}
updated = true
c.Data[ino.Name.String()] = off
off = c.calFloor(bio.Offset(-1))
}
if updated {
// write down anything which checkpoint is missing
err = logex.Trace(c.Save(utils.NewWriter(r, r.Size())))
}
return
}
// make a new one if not found
// TODO: there is two locks here
func (i *Ins) findIno(name string, blkBit uint) *Inode {
ino, _ := NewInode(rpc.NewString(name), blkBit)
off := i.cp.GetInoOffset(name)
if off > 0 {
err := ino.PRead(utils.NewBufio(utils.NewReader(i.rfd, off)))
if err != nil {
logex.Error(err)
}
}
return ino
}
func (ino *Inode) prevEx(ra io.ReaderAt) *Inode {
elem := ino.elem.Prev()
if elem != nil {
return elem.Value.(*Inode)
}
if ino.IndirIno == 0 {
return nil
}
// read from disk
r := utils.NewReader(ra, ino.IndirIno)
preIno, err := ReadInodeEx(r, ino.inodeShare)
if err != nil {
return nil
}
preIno.elem = ino.tbl.PushBack(preIno)
return preIno
}