func (s *Superblock) findAtBlock(name InodeName, ra io.ReaderAt, off int64) (int64, error) {
var r io.Reader = qio.NewReader(ra, off)
r = bufio.NewReader(io.LimitReader(r, BlockSize))
var buf [unsafe.Sizeof(InodeIndex{})]byte
var index *InodeIndex
for {
n, err := r.Read(buf[:])
if err != nil {
return 0, err
}
if n != len(buf) {
return 0, ErrNotFound.Trace()
}
index = (*InodeIndex)(unsafe.Pointer(&buf))
if index.Name.IsEmpty() {
return 0, ErrNotFound.Trace()
}
s.inodeAddr[index.Name] = index.Address
}
if addr, ok := s.inodeAddr[name]; ok {
return addr, nil
}
return 0, ErrNotFound.Trace()
}
func BenchmarkBlockRead(b *testing.B) {
defer test.New(b)
writeN(b.N, nil)
b.ResetTimer()
ins, err := New(root, 0, DefaultBit)
test.Nil(err)
w := qio.NewReader(ins, 0)
buf := make([]byte, benchmarkSize)
for i := 0; i < b.N; i++ {
n, err := w.Read(buf)
test.Nil(err)
b.SetBytes(int64(n))
}
}