vc: capabilities: add capability flags for filesystem sharing

Not all hypervisors support filesystem sharing. Add capability flags to track this. Since most hypervisor implementations in Kata *do* support this, the set semantices are reversed (ie, set the flag if you do not support the feature). Fixes: #1022 Signed-off-by: Eric Ernst <[email protected]> Signed-off-by: Julio Montes <[email protected]>
kata-containers · Dec 19, 2018 · dcd48a9 · dcd48a9
1 parent e776380
commit dcd48a9
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diff --git a/virtcontainers/capabilities.go b/virtcontainers/capabilities.go
@@ -9,6 +9,7 @@ const (
 	blockDeviceSupport = 1 << iota
 	blockDeviceHotplugSupport
 	multiQueueSupport
+	fsSharingUnsupported
 )
 
 type capabilities struct {
@@ -47,3 +48,11 @@ func (caps *capabilities) isMultiQueueSupported() bool {
 func (caps *capabilities) setMultiQueueSupport() {
 	caps.flags |= multiQueueSupport
 }
+
+func (caps *capabilities) isFsSharingSupported() bool {
+	return caps.flags&fsSharingUnsupported == 0
+}
+
+func (caps *capabilities) setFsSharingUnsupported() {
+	caps.flags |= fsSharingUnsupported
+}
diff --git a/virtcontainers/capabilities_test.go b/virtcontainers/capabilities_test.go
@@ -34,3 +34,17 @@ func TestBlockDeviceHotplugCapability(t *testing.T) {
 		t.Fatal()
 	}
 }
+
+func TestFsSharingCapability(t *testing.T) {
+	var caps capabilities
+
+	if !caps.isFsSharingSupported() {
+		t.Fatal()
+	}
+
+	caps.setFsSharingUnsupported()
+
+	if caps.isFsSharingSupported() {
+		t.Fatal()
+	}
+}