inomap: export NextSpillIno()

This will be used in reverse mode. Switch to atomic increment to avoid
a "nextSpillInoUnlocked" helper.

1 files changed, 8 insertions, 0 deletions

diff --git a/internal/inomap/inomap_test.go b/internal/inomap/inomap_test.go
index 430ec94..ce5b880 100644
--- a/internal/inomap/inomap_test.go
+++ b/internal/inomap/inomap_test.go
@@ -107,6 +107,9 @@ func TestSpill(t *testing.T) {
 	if out1&spillBit == 0 {
 		t.Error("spill bit not set")
 	}
+	if out1 != spillSpaceStart {
+		t.Errorf("unexpected first spill inode number %d", out1)
+	}
 	out2 := m.Translate(q)
 	if out2&spillBit == 0 {
 		t.Error("spill bit not set")
@@ -114,6 +117,11 @@ func TestSpill(t *testing.T) {
 	if out1 != out2 {
 		t.Errorf("unstable mapping: %d vs %d", out1, out2)
 	}
+	q.Ino = maxPassthruIno + 2
+	out3 := m.Translate(q)
+	if out3 != out1+1 {
+		t.Errorf("unexpected 2nd spill inode number %d", out1)
+	}
 }
 
 // TestUniqueness checks that unique (Dev, Flags, Ino) tuples get unique inode