rebase: Make use of latest go ceph library

The go-ceph version 0.4.0 is available now which got some important
library changes required for ceph csi project.

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

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

@@ -0,0 +1,111 @@
+// +build !luminous,!mimic
+//
+// Ceph Nautilus is the first release that includes rbd_namespace_create(),
+// rbd_namespace_remove(), rbd_namespace_exists() and rbd_namespace_list().
+
+package rbd
+
+// #cgo LDFLAGS: -lrbd
+// #include <rados/librados.h>
+// #include <rbd/librbd.h>
+// #include <stdlib.h>
+// #include <errno.h>
+import "C"
+
+import (
+	"bytes"
+	"unsafe"
+
+	"github.com/ceph/go-ceph/internal/retry"
+	"github.com/ceph/go-ceph/rados"
+)
+
+// NamespaceCreate creates the namespace for a given Rados IOContext.
+//
+// Implements:
+//  int rbd_namespace_create(rados_ioctx_t io, const char *namespace_name);
+func NamespaceCreate(ioctx *rados.IOContext, namespaceName string) error {
+	if ioctx == nil {
+		return ErrNoIOContext
+	}
+	if namespaceName == "" {
+		return ErrNoNamespaceName
+	}
+	cNamespaceName := C.CString(namespaceName)
+	defer C.free(unsafe.Pointer(cNamespaceName))
+
+	ret := C.rbd_namespace_create(cephIoctx(ioctx), cNamespaceName)
+	return getError(ret)
+}
+
+// NamespaceRemove removes a given namespace.
+//
+// Implements:
+//  int rbd_namespace_remove(rados_ioctx_t io, const char *namespace_name);
+func NamespaceRemove(ioctx *rados.IOContext, namespaceName string) error {
+	if ioctx == nil {
+		return ErrNoIOContext
+	}
+	if namespaceName == "" {
+		return ErrNoNamespaceName
+	}
+	cNamespaceName := C.CString(namespaceName)
+	defer C.free(unsafe.Pointer(cNamespaceName))
+
+	ret := C.rbd_namespace_remove(cephIoctx(ioctx), cNamespaceName)
+	return getError(ret)
+}
+
+// NamespaceExists checks whether a given namespace exists or not.
+//
+// Implements:
+//  int rbd_namespace_exists(rados_ioctx_t io, const char *namespace_name, bool *exists);
+func NamespaceExists(ioctx *rados.IOContext, namespaceName string) (bool, error) {
+	if ioctx == nil {
+		return false, ErrNoIOContext
+	}
+	if namespaceName == "" {
+		return false, ErrNoNamespaceName
+	}
+	cNamespaceName := C.CString(namespaceName)
+	defer C.free(unsafe.Pointer(cNamespaceName))
+
+	var exists C.bool
+	ret := C.rbd_namespace_exists(cephIoctx(ioctx), cNamespaceName, &exists)
+	return bool(exists), getErrorIfNegative(ret)
+}
+
+// NamespaceList returns a slice containing the names of existing rbd namespaces.
+//
+// Implements:
+//  int rbd_namespace_list(rados_ioctx_t io, char *namespace_names, size_t *size);
+func NamespaceList(ioctx *rados.IOContext) (names []string, err error) {
+	if ioctx == nil {
+		return nil, ErrNoIOContext
+	}
+	var (
+		buf   []byte
+		cSize C.size_t
+	)
+	retry.WithSizes(4096, 262144, func(size int) retry.Hint {
+		cSize = C.size_t(size)
+		buf = make([]byte, cSize)
+		ret := C.rbd_namespace_list(cephIoctx(ioctx),
+			(*C.char)(unsafe.Pointer(&buf[0])),
+			&cSize)
+		err = getErrorIfNegative(ret)
+		return retry.Size(int(cSize)).If(err == errRange)
+	})
+
+	if err != nil {
+		return nil, err
+	}
+	tmpList := bytes.Split(buf[:cSize-1], []byte{0})
+	for _, s := range tmpList {
+		if len(s) > 0 {
+			name := C.GoString((*C.char)(unsafe.Pointer(&s[0])))
+			names = append(names, name)
+		}
+	}
+	return names, nil
+}