Remove plans/ directory (P0/P1/P2 work complete)

vfs/types/types.go

@@ -77,11 +77,19 @@ func (fi *FileInfo) UpdateAccessBatched(btu *BatchedTimeUpdate) {
 	fi.AccessCount++
 }
 
-// GetTimeDecayedScore calculates a score based on access time and frequency
-// More recent and frequent accesses get higher scores
-func (fi *FileInfo) GetTimeDecayedScore() float64 {
-	timeSinceAccess := time.Since(fi.ATime).Hours()
+// DecayedScore computes the time-decayed eviction score from scalar snapshot values (aTime, accessCount).
+// This is the canonical implementation of the decay formula (shared to eliminate duplication).
+// Used by FileInfo.GetTimeDecayedScore and by EvictHybrid (memory/disk) for race-free scoring
+// on values captured under RLock.
+func DecayedScore(aTime time.Time, accessCount int) float64 {
+	timeSinceAccess := time.Since(aTime).Hours()
 	decayFactor := 1.0 / (1.0 + timeSinceAccess/24.0) // Decay over days
-	frequencyBonus := float64(fi.AccessCount) * 0.1
+	frequencyBonus := float64(accessCount) * 0.1
 	return decayFactor + frequencyBonus
 }
+
+// GetTimeDecayedScore calculates a score based on access time and frequency
+// More recent and frequent accesses get higher scores.
+func (fi *FileInfo) GetTimeDecayedScore() float64 {
+	return DecayedScore(fi.ATime, fi.AccessCount)
+}

vfs/types/types_test.go

@@ -0,0 +1,54 @@
+package types
+
+import (
+	"testing"
+	"time"
+)
+
+func TestNewFileInfo(t *testing.T) {
+	t.Parallel()
+	fi := NewFileInfo("k", 42)
+	if fi.Key != "k" || fi.Size != 42 || fi.AccessCount != 1 {
+		t.Errorf("bad NewFileInfo: %+v", fi)
+	}
+	if time.Since(fi.ATime) > time.Second || time.Since(fi.CTime) > time.Second {
+		t.Error("timestamps not recent")
+	}
+}
+
+func TestUpdateAccess(t *testing.T) {
+	t.Parallel()
+	fi := NewFileInfo("k", 1)
+	oldCount := fi.AccessCount
+	oldAT := fi.ATime
+	time.Sleep(2 * time.Millisecond)
+	fi.UpdateAccess()
+	if fi.AccessCount != oldCount+1 {
+		t.Error("access count not inc")
+	}
+	if !fi.ATime.After(oldAT) {
+		t.Error("ATime not updated")
+	}
+}
+
+func TestBatchedTimeUpdate(t *testing.T) {
+	t.Parallel()
+	b := NewBatchedTimeUpdate(50 * time.Millisecond)
+	t1 := b.GetTime()
+	time.Sleep(10 * time.Millisecond)
+	t2 := b.GetTime()
+	// within interval, same
+	if t1 != t2 {
+		t.Log("batched may have ticked, ok")
+	}
+}
+
+func TestGetTimeDecayedScore(t *testing.T) {
+	t.Parallel()
+	fi := NewFileInfo("k", 100)
+	fi.AccessCount = 5
+	score := fi.GetTimeDecayedScore()
+	if score <= 0 {
+		t.Errorf("score = %f, want >0", score)
+	}
+}