initial code repo

[stor4nfv.git] / src / ceph / src / librbd / Utils.cc

diff --git a/src/ceph/src/librbd/Utils.cc b/src/ceph/src/librbd/Utils.cc
new file mode 100644 (file)
index 0000000..dc6e798
--- /dev/null
+++ b/src/ceph/src/librbd/Utils.cc
@@ -0,0 +1,103 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include <boost/algorithm/string.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include "librbd/Utils.h"
+#include "include/rbd_types.h"
+#include "include/stringify.h"
+#include "include/rbd/features.h"
+#include "common/dout.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd: "
+
+namespace librbd {
+namespace util {
+
+const std::string group_header_name(const std::string &group_id)
+{
+  return RBD_GROUP_HEADER_PREFIX + group_id;
+}
+
+const std::string id_obj_name(const std::string &name)
+{
+  return RBD_ID_PREFIX + name;
+}
+
+const std::string header_name(const std::string &image_id)
+{
+  return RBD_HEADER_PREFIX + image_id;
+}
+
+const std::string old_header_name(const std::string &image_name)
+{
+  return image_name + RBD_SUFFIX;
+}
+
+std::string unique_lock_name(const std::string &name, void *address) {
+  return name + " (" + stringify(address) + ")";
+}
+
+librados::AioCompletion *create_rados_callback(Context *on_finish) {
+  return create_rados_callback<Context, &Context::complete>(on_finish);
+}
+
+std::string generate_image_id(librados::IoCtx &ioctx) {
+  librados::Rados rados(ioctx);
+
+  uint64_t bid = rados.get_instance_id();
+  uint32_t extra = rand() % 0xFFFFFFFF;
+
+  ostringstream bid_ss;
+  bid_ss << std::hex << bid << std::hex << extra;
+  std::string id = bid_ss.str();
+
+  // ensure the image id won't overflow the fixed block name size
+  if (id.length() > RBD_MAX_IMAGE_ID_LENGTH) {
+    id = id.substr(id.length() - RBD_MAX_IMAGE_ID_LENGTH);
+  }
+
+  return id;
+}
+
+uint64_t get_rbd_default_features(CephContext* cct)
+{
+  auto str_val = cct->_conf->get_val<std::string>("rbd_default_features");
+  return boost::lexical_cast<uint64_t>(str_val);
+}
+
+bool calc_sparse_extent(const bufferptr &bp,
+                        size_t sparse_size,
+                        uint64_t length,
+                        size_t *write_offset,
+                        size_t *write_length,
+                        size_t *offset) {
+  size_t extent_size;
+  if (*offset + sparse_size > length) {
+    extent_size = length - *offset;
+  } else {
+    extent_size = sparse_size;
+  }
+
+  bufferptr extent(bp, *offset, extent_size);
+  *offset += extent_size;
+
+  bool extent_is_zero = extent.is_zero();
+  if (!extent_is_zero) {
+    *write_length += extent_size;
+  }
+  if (extent_is_zero && *write_length == 0) {
+    *write_offset += extent_size;
+  }
+
+  if ((extent_is_zero || *offset == length) && *write_length != 0) {
+    return true;
+  }
+  return false;
+}
+} // namespace util
+
+} // namespace librbd