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/rbd/rbd_nautilus.go

@@ -13,30 +13,28 @@ import "C"
 import (
 	"unsafe"
 
-	"github.com/ceph/go-ceph/internal/retry"
 	ts "github.com/ceph/go-ceph/internal/timespec"
 	"github.com/ceph/go-ceph/rados"
 )
 
 // GetImageNames returns the list of current RBD images.
 func GetImageNames(ioctx *rados.IOContext) ([]string, error) {
-	var (
-		err    error
-		images []C.rbd_image_spec_t
-		size   C.size_t
-	)
-	retry.WithSizes(32, 4096, func(s int) retry.Hint {
-		size = C.size_t(s)
+	var images []C.rbd_image_spec_t
+	size := C.size_t(4096)
+	for {
 		images = make([]C.rbd_image_spec_t, size)
 		ret := C.rbd_list2(
 			cephIoctx(ioctx),
 			(*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])),
 			&size)
-		err = getErrorIfNegative(ret)
-		return retry.Size(int(size)).If(err == errRange)
-	})
-	if err != nil {
-		return nil, err
+		err := getErrorIfNegative(ret)
+		if err != nil {
+			if err == errRange {
+				continue
+			}
+			return nil, err
+		}
+		break
 	}
 	defer C.rbd_image_spec_list_cleanup((*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])), size)
 

vendor/github.com/ceph/go-ceph/rbd/snapshot_rename.go

@@ -0,0 +1,37 @@
+//go:build ceph_preview
+// +build ceph_preview
+
+package rbd
+
+// #cgo LDFLAGS: -lrbd
+// #include <stdlib.h>
+// #include <rbd/librbd.h>
+import "C"
+
+import (
+	"unsafe"
+)
+
+// Rename a snapshot.
+//
+// Implements:
+// 	int rbd_snap_rename(rbd_image_t image, const char *snapname,
+//				 const char* dstsnapsname);
+func (snapshot *Snapshot) Rename(destName string) error {
+	if err := snapshot.validate(imageNeedsIOContext | imageIsOpen | imageNeedsName | snapshotNeedsName); err != nil {
+		return err
+	}
+
+	cSrcName := C.CString(snapshot.name)
+	cDestName := C.CString(destName)
+	defer C.free(unsafe.Pointer(cSrcName))
+	defer C.free(unsafe.Pointer(cDestName))
+
+	err := C.rbd_snap_rename(snapshot.image.image, cSrcName, cDestName)
+	if err != 0 {
+		return getError(err)
+	}
+
+	snapshot.name = destName
+	return nil
+}