ceph/src/librbd/crypto/CryptoImageDispatch.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "librbd/crypto/CryptoImageDispatch.h"
   5
   6 namespace librbd {
   7 namespace crypto {
   8
   9 CryptoImageDispatch::CryptoImageDispatch(
  10         uint64_t data_offset) : m_data_offset(data_offset) {
  11 }
  12
  13 void CryptoImageDispatch::remap_to_physical(io::Extents& image_extents,
  14                                             io::ImageArea area) {
  15   switch (area) {
  16   case io::ImageArea::DATA:
  17     for (auto& [off, _] : image_extents) {
  18       off += m_data_offset;
  19     }
  20     break;
  21   case io::ImageArea::CRYPTO_HEADER:
  22     // direct mapping
  23     break;
  24   default:
  25     ceph_abort();
  26   }
  27 }
  28
  29 io::ImageArea CryptoImageDispatch::remap_to_logical(
  30     io::Extents& image_extents) {
  31   bool saw_data = false;
  32   bool saw_crypto_header = false;
  33   for (auto& [off, _] : image_extents) {
  34     if (off >= m_data_offset) {
  35       off -= m_data_offset;
  36       saw_data = true;
  37     } else {
  38       saw_crypto_header = true;
  39     }
  40   }
  41   if (saw_crypto_header) {
  42     ceph_assert(!saw_data);
  43     return io::ImageArea::CRYPTO_HEADER;
  44   }
  45   return io::ImageArea::DATA;
  46 }
  47
  48 } // namespace crypto
  49 } // namespace librbd