rebase: update go-ceph to v0.8.0

Updating go-ceph to v0.8.0.

Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>

vendor/github.com/ceph/go-ceph/rados/read_op.go

@@ -0,0 +1,84 @@
+package rados
+
+// #cgo LDFLAGS: -lrados
+// #include <errno.h>
+// #include <stdlib.h>
+// #include <rados/librados.h>
+//
+import "C"
+
+import (
+	"unsafe"
+)
+
+// ReadOp manages a set of discrete object read actions that will be performed
+// together atomically.
+type ReadOp struct {
+	operation
+	op C.rados_read_op_t
+}
+
+// CreateReadOp returns a newly constructed read operation.
+func CreateReadOp() *ReadOp {
+	return &ReadOp{
+		op: C.rados_create_read_op(),
+	}
+}
+
+// Release the resources associated with this read operation.
+func (r *ReadOp) Release() {
+	C.rados_release_read_op(r.op)
+	r.op = nil
+	r.free()
+}
+
+// Operate will perform the operation(s).
+func (r *ReadOp) Operate(ioctx *IOContext, oid string, flags OperationFlags) error {
+	if err := ioctx.validate(); err != nil {
+		return err
+	}
+
+	cOid := C.CString(oid)
+	defer C.free(unsafe.Pointer(cOid))
+
+	ret := C.rados_read_op_operate(r.op, ioctx.ioctx, cOid, C.int(flags))
+	return r.update(readOp, ret)
+}
+
+func (r *ReadOp) operateCompat(ioctx *IOContext, oid string) error {
+	switch err := r.Operate(ioctx, oid, OperationNoFlag).(type) {
+	case nil:
+		return nil
+	case OperationError:
+		return err.OpError
+	default:
+		return err
+	}
+}
+
+// AssertExists assures the object targeted by the read op exists.
+//
+// Implements:
+//  void rados_read_op_assert_exists(rados_read_op_t read_op);
+func (r *ReadOp) AssertExists() {
+	C.rados_read_op_assert_exists(r.op)
+}
+
+// GetOmapValues is used to iterate over a set, or sub-set, of omap keys
+// as part of a read operation. An GetOmapStep is returned from this
+// function. The GetOmapStep may be used to iterate over the key-value
+// pairs after the Operate call has been performed.
+func (r *ReadOp) GetOmapValues(startAfter, filterPrefix string, maxReturn uint64) *GetOmapStep {
+	gos := newGetOmapStep(startAfter, filterPrefix, maxReturn)
+	r.steps = append(r.steps, gos)
+	C.rados_read_op_omap_get_vals2(
+		r.op,
+		gos.cStartAfter,
+		gos.cFilterPrefix,
+		C.uint64_t(gos.maxReturn),
+		&gos.iter,
+		&gos.more,
+		&gos.rval,
+	)
+	return gos
+}