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Diffstat (limited to 'src/librbd/deep_copy/Utils.cc')
-rw-r--r-- | src/librbd/deep_copy/Utils.cc | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/librbd/deep_copy/Utils.cc b/src/librbd/deep_copy/Utils.cc new file mode 100644 index 00000000..c2dd2502 --- /dev/null +++ b/src/librbd/deep_copy/Utils.cc @@ -0,0 +1,61 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "common/debug.h" +#include "Utils.h" +#include <set> + +namespace librbd { +namespace deep_copy { +namespace util { + +#define dout_subsys ceph_subsys_rbd +#undef dout_prefix +#define dout_prefix *_dout << "librbd::deep_copy::util::" << __func__ << ": " + +void compute_snap_map(CephContext* cct, + librados::snap_t src_snap_id_start, + librados::snap_t src_snap_id_end, + const SnapIds& dst_snap_ids, + const SnapSeqs &snap_seqs, + SnapMap *snap_map) { + std::set<librados::snap_t> ordered_dst_snap_ids{ + dst_snap_ids.begin(), dst_snap_ids.end()}; + auto dst_snap_id_it = ordered_dst_snap_ids.begin(); + + SnapIds snap_ids; + for (auto &it : snap_seqs) { + // ensure all dst snap ids are included in the mapping table since + // deep copy will skip non-user snapshots + while (dst_snap_id_it != ordered_dst_snap_ids.end()) { + if (*dst_snap_id_it < it.second) { + snap_ids.insert(snap_ids.begin(), *dst_snap_id_it); + } else if (*dst_snap_id_it > it.second) { + break; + } + ++dst_snap_id_it; + } + + // we should only have the HEAD revision in the the last snap seq + ceph_assert(snap_ids.empty() || snap_ids[0] != CEPH_NOSNAP); + snap_ids.insert(snap_ids.begin(), it.second); + + if (it.first < src_snap_id_start) { + continue; + } else if (it.first > src_snap_id_end) { + break; + } + + (*snap_map)[it.first] = snap_ids; + } + + ldout(cct, 10) << "src_snap_id_start=" << src_snap_id_start << ", " + << "src_snap_id_end=" << src_snap_id_end << ", " + << "dst_snap_ids=" << dst_snap_ids << ", " + << "snap_seqs=" << snap_seqs << ", " + << "snap_map=" << *snap_map << dendl; +} + +} // namespace util +} // namespace deep_copy +} // namespace librbd |