fix index key to new uint8 size

examples/xattridx/main.go

@@ -13,7 +13,7 @@ func main() {
 	// flags mount path name
 	mountPath := flag.String("mount", "", "mount path name")
 	// flags index type uint64
-	indexType := flag.Uint64("type", 0, "index type")
+	indexType := flag.Uint("type", 0, "index type")
 	// flags index start uint64
 	indexStart := flag.Uint64("start", 0, "index start")
 	// flags index end uint64
@@ -29,7 +29,12 @@ func main() {
 	}
 	defer f.Close()
 
-	idx := scoutfs.NewIndexSearch(f, *indexType, *indexStart, *indexEnd)
+	if *indexType > 255 {
+		log.Fatal("index type out of bounds")
+	}
+	itype := uint8(*indexType)
+
+	idx := scoutfs.NewIndexSearch(f, itype, *indexStart, *indexEnd)
 	for {
 		ents, err := idx.Next()
 		if err != nil {

scoutfs.go

@@ -1707,17 +1707,17 @@ const (
 	indexXattrBatch = 1024
 )
 
-func NewIndexSearch(f *os.File, key, start, end uint64, opts ...IOption) *IndexSearch {
+func NewIndexSearch(f *os.File, key uint8, start, end uint64, opts ...IOption) *IndexSearch {
 	i := &IndexSearch{
 		f: f,
 		pos: indexEntry{
-			A: key,
+			Major: key,
-			B: start,
+			Minor: start,
 		},
 		end: indexEntry{
-			A:   key,
+			Major: key,
-			B:   end,
+			Minor: end,
-			Ino: math.MaxUint64,
+			Ino:   math.MaxUint64,
 		},
 		batch: indexXattrBatch,
 	}
@@ -1789,7 +1789,7 @@ func (i *IndexSearch) Next() ([]IndexEnt, error) {
 		}
 
 		inodes[i].Inode = e.Ino
-		inodes[i].Value = e.B
+		inodes[i].Value = e.Minor
 	}
 	i.pos = e.increment()
 
@@ -1800,9 +1800,9 @@ func (i *IndexSearch) Next() ([]IndexEnt, error) {
 func (i indexEntry) increment() indexEntry {
 	i.Ino++
 	if i.Ino == 0 {
-		i.B++
+		i.Minor++
-		if i.B == 0 {
+		if i.Minor == 0 {
-			i.A++
+			i.Major++
 		}
 	}
 	return i

scoutfsdefs.go

@@ -213,9 +213,10 @@ type getQuotaRules struct {
 	Nr		uint64
 }
 type indexEntry struct {
-	A	uint64
+	Minor	uint64
-	B	uint64
 	Ino	uint64
+	Major	uint8
+	X_pad	[7]uint8
 }
 type readXattrIndex struct {
 	Flags	uint64