1 files changed, 86 insertions, 0 deletions
diff --git a/src/librbd/journal/Utils.cc b/src/librbd/journal/Utils.cc
new file mode 100644
index 000000000..231bcae2d
--- /dev/null
+++ b/src/librbd/journal/Utils.cc
@@ -0,0 +1,86 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/journal/Utils.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "librbd/journal/Types.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::journal::"
+
+namespace librbd {
+namespace journal {
+namespace util {
+
+int C_DecodeTag::decode(bufferlist::const_iterator *it, TagData *tag_data) {
+  try {
+    using ceph::decode;
+    decode(*tag_data, *it);
+  } catch (const buffer::error &err) {
+    return -EBADMSG;
+  }
+  return 0;
+}
+
+int C_DecodeTag::process(int r) {
+  if (r < 0) {
+    lderr(cct) << "C_DecodeTag: " << this << " " << __func__ << ": "
+               << "failed to allocate tag: " << cpp_strerror(r)
+      	 << dendl;
+    return r;
+  }
+
+  std::lock_guard locker{*lock};
+  *tag_tid = tag.tid;
+
+  auto data_it = tag.data.cbegin();
+  r = decode(&data_it, tag_data);
+  if (r < 0) {
+    lderr(cct) << "C_DecodeTag: " << this << " " << __func__ << ": "
+               << "failed to decode allocated tag" << dendl;
+    return r;
+  }
+
+  ldout(cct, 20) << "C_DecodeTag: " << this << " " << __func__ << ": "
+                 << "allocated journal tag: "
+                 << "tid=" << tag.tid << ", "
+                 << "data=" << *tag_data << dendl;
+  return 0;
+}
+
+int C_DecodeTags::process(int r) {
+  if (r < 0) {
+    lderr(cct) << "C_DecodeTags: " << this << " " << __func__ << ": "
+               << "failed to retrieve journal tags: " << cpp_strerror(r)
+               << dendl;
+    return r;
+  }
+
+  if (tags.empty()) {
+    lderr(cct) << "C_DecodeTags: " << this << " " << __func__ << ": "
+               << "no journal tags retrieved" << dendl;
+    return -ENOENT;
+  }
+
+  std::lock_guard locker{*lock};
+  *tag_tid = tags.back().tid;
+  auto data_it = tags.back().data.cbegin();
+  r = C_DecodeTag::decode(&data_it, tag_data);
+  if (r < 0) {
+    lderr(cct) << "C_DecodeTags: " << this << " " << __func__ << ": "
+               << "failed to decode journal tag" << dendl;
+    return r;
+  }
+
+  ldout(cct, 20) << "C_DecodeTags: " << this << " " << __func__ << ": "
+                 << "most recent journal tag: "
+                 << "tid=" << *tag_tid << ", "
+                 << "data=" << *tag_data << dendl;
+  return 0;
+}
+
+} // namespace util
+} // namespace journal
+} // namespace librbd