rebase: bump go-ceph version to v0.16.0

go-ceph v0.16.0 contains subvolume metadata APIs and subvolume snapshot
metadata APIs.

Please note, as the APIs can not be tested in the go-ceph CI, it requires
build-tag `ceph_ci_untested`.

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

vendor/github.com/ceph/go-ceph/cephfs/admin/metadata.go

@@ -0,0 +1,104 @@
+//go:build !(nautilus || octopus) && ceph_preview && ceph_ci_untested
+// +build !nautilus,!octopus,ceph_preview,ceph_ci_untested
+
+package admin
+
+import "C"
+
+// GetMetadata gets custom metadata on the subvolume in a volume belonging to
+// an optional subvolume group based on provided key name.
+//
+// Similar To:
+//  ceph fs subvolume metadata get <vol_name> <sub_name> <key_name> [--group_name <subvol_group_name>]
+func (fsa *FSAdmin) GetMetadata(volume, group, subvolume, key string) (string, error) {
+	m := map[string]string{
+		"prefix":   "fs subvolume metadata get",
+		"format":   "json",
+		"vol_name": volume,
+		"sub_name": subvolume,
+		"key_name": key,
+	}
+
+	if group != NoGroup {
+		m["group_name"] = group
+	}
+
+	return parsePathResponse(fsa.marshalMgrCommand(m))
+}
+
+// SetMetadata sets custom metadata on the subvolume in a volume belonging to
+// an optional subvolume group as a key-value pair.
+//
+// Similar To:
+//  ceph fs subvolume metadata set <vol_name> <sub_name> <key_name> <value> [--group_name <subvol_group_name>]
+func (fsa *FSAdmin) SetMetadata(volume, group, subvolume, key, value string) error {
+	m := map[string]string{
+		"prefix":   "fs subvolume metadata set",
+		"format":   "json",
+		"vol_name": volume,
+		"sub_name": subvolume,
+		"key_name": key,
+		"value":    value,
+	}
+
+	if group != NoGroup {
+		m["group_name"] = group
+	}
+
+	return fsa.marshalMgrCommand(m).NoData().End()
+}
+
+// RemoveMetadata removes custom metadata set on the subvolume in a volume
+// belonging to an optional subvolume group using the metadata key.
+//
+// Similar To:
+//  ceph fs subvolume metadata rm <vol_name> <sub_name> <key_name> [--group_name <subvol_group_name>]
+func (fsa *FSAdmin) RemoveMetadata(volume, group, subvolume, key string) error {
+	return fsa.rmSubVolumeMetadata(volume, group, subvolume, key, commonRmFlags{})
+}
+
+// ForceRemoveMetadata attempt to forcefully remove custom metadata set on
+// the subvolume in a volume belonging to an optional subvolume group using
+// the metadata key.
+//
+// Similar To:
+//  ceph fs subvolume metadata rm <vol_name> <sub_name> <key_name> [--group_name <subvol_group_name>] --force
+func (fsa *FSAdmin) ForceRemoveMetadata(volume, group, subvolume, key string) error {
+	return fsa.rmSubVolumeMetadata(volume, group, subvolume, key, commonRmFlags{force: true})
+}
+
+func (fsa *FSAdmin) rmSubVolumeMetadata(volume, group, subvolume, key string, o commonRmFlags) error {
+	m := map[string]string{
+		"prefix":   "fs subvolume metadata rm",
+		"format":   "json",
+		"vol_name": volume,
+		"sub_name": subvolume,
+		"key_name": key,
+	}
+
+	if group != NoGroup {
+		m["group_name"] = group
+	}
+
+	return fsa.marshalMgrCommand(mergeFlags(m, o)).NoData().End()
+}
+
+// ListMetadata lists custom metadata (key-value pairs) set on the subvolume
+// in a volume belonging to an optional subvolume group.
+//
+// Similar To:
+//  ceph fs subvolume metadata ls <vol_name> <sub_name> [--group_name <subvol_group_name>]
+func (fsa *FSAdmin) ListMetadata(volume, group, subvolume string) (map[string]string, error) {
+	m := map[string]string{
+		"prefix":   "fs subvolume metadata ls",
+		"format":   "json",
+		"vol_name": volume,
+		"sub_name": subvolume,
+	}
+
+	if group != NoGroup {
+		m["group_name"] = group
+	}
+
+	return parseListKeyValues(fsa.marshalMgrCommand(m))
+}