Change Mounted to return the number of times mounted

podman unmount wants to know if the image is only mounted 1 time
and refuse to unmount if the container state expects it to be mounted.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

cmd/containers-storage/mount.go

@@ -88,7 +88,7 @@ func mounted(flags *mflag.FlagSet, action string, m storage.Store, args []string
 			errText = fmt.Sprintf("%v", err)
 			errors = true
 		} else {
-			if mounted {
+			if mounted > 0 {
 				fmt.Printf("%s mounted\n", arg)
 			}
 		}

layers.go

@@ -213,8 +213,8 @@ type LayerStore interface {
 	// Unmount unmounts a layer when it is no longer in use.
 	Unmount(id string, force bool) (bool, error)
 
-	// Mounted returns whether or not the layer is mounted.
-	Mounted(id string) (bool, error)
+	// Mounted returns number of times the layer has been mounted.
+	Mounted(id string) (int, error)
 
 	// ParentOwners returns the UIDs and GIDs of parents of the layer's mountpoint
 	// for which the layer's UID and GID maps don't contain corresponding entries.
@@ -627,12 +627,12 @@ func (r *layerStore) Create(id string, parent *Layer, names []string, mountLabel
 	return r.CreateWithFlags(id, parent, names, mountLabel, options, moreOptions, writeable, nil)
 }
 
-func (r *layerStore) Mounted(id string) (bool, error) {
+func (r *layerStore) Mounted(id string) (int, error) {
 	layer, ok := r.lookup(id)
 	if !ok {
-		return false, ErrLayerUnknown
+		return 0, ErrLayerUnknown
 	}
-	return layer.MountCount > 0, nil
+	return layer.MountCount, nil
 }
 
 func (r *layerStore) Mount(id, mountLabel string) (string, error) {

layers_ffjson.go

@@ -1,5 +1,5 @@
 // Code generated by ffjson <https://github.com/pquerna/ffjson>. DO NOT EDIT.
-// source: ./layers.go
+// source: layers.go
 
 package storage
 

store.go

@@ -265,8 +265,8 @@ type Store interface {
 	// name, or a mount path. Returns whether or not the layer is still mounted.
 	Unmount(id string, force bool) (bool, error)
 
-	// Unmount attempts to discover whether the specified id is mounted.
-	Mounted(id string) (bool, error)
+	// Mounted returns number of times the layer has been mounted.
+	Mounted(id string) (int, error)
 
 	// Changes returns a summary of the changes which would need to be made
 	// to one layer to make its contents the same as a second layer.  If
@@ -2248,13 +2248,13 @@ func (s *store) Mount(id, mountLabel string) (string, error) {
 	return "", ErrLayerUnknown
 }
 
-func (s *store) Mounted(id string) (bool, error) {
+func (s *store) Mounted(id string) (int, error) {
 	if layerID, err := s.ContainerLayerID(id); err == nil {
 		id = layerID
 	}
 	rlstore, err := s.LayerStore()
 	if err != nil {
-		return false, err
+		return 0, err
 	}
 	rlstore.Lock()
 	defer rlstore.Unlock()