diff options
Diffstat (limited to 'src/rgw/rgw_obj_manifest.cc')
| -rw-r--r-- | src/rgw/rgw_obj_manifest.cc | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/src/rgw/rgw_obj_manifest.cc b/src/rgw/rgw_obj_manifest.cc new file mode 100644 index 000000000..1d1c3b5cf --- /dev/null +++ b/src/rgw/rgw_obj_manifest.cc @@ -0,0 +1,260 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab ft=cpp + +#include "rgw_obj_manifest.h" + +#include "rgw_rados.h" // RGW_OBJ_NS_SHADOW and RGW_OBJ_NS_MULTIPART + +using namespace std; + +void RGWObjManifest::obj_iterator::operator++() +{ + if (manifest->explicit_objs) { + ++explicit_iter; + + if (explicit_iter == manifest->objs.end()) { + ofs = manifest->obj_size; + stripe_size = 0; + return; + } + + update_explicit_pos(); + + update_location(); + return; + } + + uint64_t obj_size = manifest->get_obj_size(); + uint64_t head_size = manifest->get_head_size(); + + if (ofs == obj_size) { + return; + } + + if (manifest->rules.empty()) { + return; + } + + /* are we still pointing at the head? */ + if (ofs < head_size) { + rule_iter = manifest->rules.begin(); + const RGWObjManifestRule *rule = &rule_iter->second; + ofs = std::min(head_size, obj_size); + stripe_ofs = ofs; + cur_stripe = 1; + stripe_size = std::min(obj_size - ofs, rule->stripe_max_size); + if (rule->part_size > 0) { + stripe_size = std::min(stripe_size, rule->part_size); + } + update_location(); + return; + } + + const RGWObjManifestRule *rule = &rule_iter->second; + + stripe_ofs += rule->stripe_max_size; + cur_stripe++; + ldpp_dout(dpp, 20) << "RGWObjManifest::operator++(): rule->part_size=" << rule->part_size << " rules.size()=" << manifest->rules.size() << dendl; + + if (rule->part_size > 0) { + /* multi part, multi stripes object */ + + ldpp_dout(dpp, 20) << "RGWObjManifest::operator++(): stripe_ofs=" << stripe_ofs << " part_ofs=" << part_ofs << " rule->part_size=" << rule->part_size << dendl; + + if (stripe_ofs >= part_ofs + rule->part_size) { + /* moved to the next part */ + cur_stripe = 0; + part_ofs += rule->part_size; + stripe_ofs = part_ofs; + + bool last_rule = (next_rule_iter == manifest->rules.end()); + /* move to the next rule? */ + if (!last_rule && stripe_ofs >= next_rule_iter->second.start_ofs) { + rule_iter = next_rule_iter; + last_rule = (next_rule_iter == manifest->rules.end()); + if (!last_rule) { + ++next_rule_iter; + } + cur_part_id = rule_iter->second.start_part_num; + } else { + cur_part_id++; + } + + rule = &rule_iter->second; + } + + stripe_size = std::min(rule->part_size - (stripe_ofs - part_ofs), rule->stripe_max_size); + } + + cur_override_prefix = rule->override_prefix; + + ofs = stripe_ofs; + if (ofs > obj_size) { + ofs = obj_size; + stripe_ofs = ofs; + stripe_size = 0; + } + + ldpp_dout(dpp, 20) << "RGWObjManifest::operator++(): result: ofs=" << ofs << " stripe_ofs=" << stripe_ofs << " part_ofs=" << part_ofs << " rule->part_size=" << rule->part_size << dendl; + update_location(); +} + +void RGWObjManifest::obj_iterator::seek(uint64_t o) +{ + ofs = o; + if (manifest->explicit_objs) { + explicit_iter = manifest->objs.upper_bound(ofs); + if (explicit_iter != manifest->objs.begin()) { + --explicit_iter; + } + if (ofs < manifest->obj_size) { + update_explicit_pos(); + } else { + ofs = manifest->obj_size; + } + update_location(); + return; + } + if (o < manifest->get_head_size()) { + rule_iter = manifest->rules.begin(); + stripe_ofs = 0; + stripe_size = manifest->get_head_size(); + if (rule_iter != manifest->rules.end()) { + cur_part_id = rule_iter->second.start_part_num; + cur_override_prefix = rule_iter->second.override_prefix; + } + update_location(); + return; + } + + rule_iter = manifest->rules.upper_bound(ofs); + next_rule_iter = rule_iter; + if (rule_iter != manifest->rules.begin()) { + --rule_iter; + } + + if (rule_iter == manifest->rules.end()) { + update_location(); + return; + } + + const RGWObjManifestRule& rule = rule_iter->second; + + if (rule.part_size > 0) { + cur_part_id = rule.start_part_num + (ofs - rule.start_ofs) / rule.part_size; + } else { + cur_part_id = rule.start_part_num; + } + part_ofs = rule.start_ofs + (cur_part_id - rule.start_part_num) * rule.part_size; + + if (rule.stripe_max_size > 0) { + cur_stripe = (ofs - part_ofs) / rule.stripe_max_size; + + stripe_ofs = part_ofs + cur_stripe * rule.stripe_max_size; + if (!cur_part_id && manifest->get_head_size() > 0) { + cur_stripe++; + } + } else { + cur_stripe = 0; + stripe_ofs = part_ofs; + } + + if (!rule.part_size) { + stripe_size = rule.stripe_max_size; + stripe_size = std::min(manifest->get_obj_size() - stripe_ofs, stripe_size); + } else { + uint64_t next = std::min(stripe_ofs + rule.stripe_max_size, part_ofs + rule.part_size); + stripe_size = next - stripe_ofs; + } + + cur_override_prefix = rule.override_prefix; + + update_location(); +} + +void RGWObjManifest::obj_iterator::update_explicit_pos() +{ + ofs = explicit_iter->first; + stripe_ofs = ofs; + + auto next_iter = explicit_iter; + ++next_iter; + if (next_iter != manifest->objs.end()) { + stripe_size = next_iter->first - ofs; + } else { + stripe_size = manifest->obj_size - ofs; + } +} + +void RGWObjManifest::obj_iterator::update_location() +{ + if (manifest->explicit_objs) { + if (manifest->empty()) { + location = rgw_obj_select{}; + } else { + location = explicit_iter->second.loc; + } + return; + } + + if (ofs < manifest->get_head_size()) { + location = manifest->get_obj(); + location.set_placement_rule(manifest->get_head_placement_rule()); + return; + } + + manifest->get_implicit_location(cur_part_id, cur_stripe, ofs, &cur_override_prefix, &location); +} + +void RGWObjManifest::get_implicit_location(uint64_t cur_part_id, uint64_t cur_stripe, + uint64_t ofs, string *override_prefix, rgw_obj_select *location) const +{ + rgw_obj loc; + + string& oid = loc.key.name; + string& ns = loc.key.ns; + + if (!override_prefix || override_prefix->empty()) { + oid = prefix; + } else { + oid = *override_prefix; + } + + if (!cur_part_id) { + if (ofs < max_head_size) { + location->set_placement_rule(head_placement_rule); + *location = obj; + return; + } else { + char buf[16]; + snprintf(buf, sizeof(buf), "%d", (int)cur_stripe); + oid += buf; + ns = RGW_OBJ_NS_SHADOW; + } + } else { + char buf[32]; + if (cur_stripe == 0) { + snprintf(buf, sizeof(buf), ".%d", (int)cur_part_id); + oid += buf; + ns= RGW_OBJ_NS_MULTIPART; + } else { + snprintf(buf, sizeof(buf), ".%d_%d", (int)cur_part_id, (int)cur_stripe); + oid += buf; + ns = RGW_OBJ_NS_SHADOW; + } + } + + if (!tail_placement.bucket.name.empty()) { + loc.bucket = tail_placement.bucket; + } else { + loc.bucket = obj.bucket; + } + + // Always overwrite instance with tail_instance + // to get the right shadow object location + loc.key.set_instance(tail_instance); + + location->set_placement_rule(tail_placement.placement_rule); + *location = loc; +} + |