--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include "SnapMapper.h"
+
+#define dout_context cct
+#define dout_subsys ceph_subsys_osd
+#undef dout_prefix
+#define dout_prefix *_dout << "snap_mapper."
+
+using std::string;
+
+const string SnapMapper::MAPPING_PREFIX = "MAP_";
+const string SnapMapper::OBJECT_PREFIX = "OBJ_";
+
+int OSDriver::get_keys(
+ const std::set<std::string> &keys,
+ std::map<std::string, bufferlist> *out)
+{
+ return os->omap_get_values(cid, hoid, keys, out);
+}
+
+int OSDriver::get_next(
+ const std::string &key,
+ pair<std::string, bufferlist> *next)
+{
+ ObjectMap::ObjectMapIterator iter =
+ os->get_omap_iterator(cid, hoid);
+ if (!iter) {
+ ceph_abort();
+ return -EINVAL;
+ }
+ iter->upper_bound(key);
+ if (iter->valid()) {
+ if (next)
+ *next = make_pair(iter->key(), iter->value());
+ return 0;
+ } else {
+ return -ENOENT;
+ }
+}
+
+struct Mapping {
+ snapid_t snap;
+ hobject_t hoid;
+ explicit Mapping(const pair<snapid_t, hobject_t> &in)
+ : snap(in.first), hoid(in.second) {}
+ Mapping() : snap(0) {}
+ void encode(bufferlist &bl) const {
+ ENCODE_START(1, 1, bl);
+ ::encode(snap, bl);
+ ::encode(hoid, bl);
+ ENCODE_FINISH(bl);
+ }
+ void decode(bufferlist::iterator &bl) {
+ DECODE_START(1, bl);
+ ::decode(snap, bl);
+ ::decode(hoid, bl);
+ DECODE_FINISH(bl);
+ }
+};
+WRITE_CLASS_ENCODER(Mapping)
+
+string SnapMapper::get_prefix(snapid_t snap)
+{
+ char buf[100];
+ int len = snprintf(
+ buf, sizeof(buf),
+ "%.*X_", (int)(sizeof(snap)*2),
+ static_cast<unsigned>(snap));
+ return MAPPING_PREFIX + string(buf, len);
+}
+
+string SnapMapper::to_raw_key(
+ const pair<snapid_t, hobject_t> &in)
+{
+ return get_prefix(in.first) + shard_prefix + in.second.to_str();
+}
+
+pair<string, bufferlist> SnapMapper::to_raw(
+ const pair<snapid_t, hobject_t> &in)
+{
+ bufferlist bl;
+ ::encode(Mapping(in), bl);
+ return make_pair(
+ to_raw_key(in),
+ bl);
+}
+
+pair<snapid_t, hobject_t> SnapMapper::from_raw(
+ const pair<std::string, bufferlist> &image)
+{
+ Mapping map;
+ bufferlist bl(image.second);
+ bufferlist::iterator bp(bl.begin());
+ ::decode(map, bp);
+ return make_pair(map.snap, map.hoid);
+}
+
+bool SnapMapper::is_mapping(const string &to_test)
+{
+ return to_test.substr(0, MAPPING_PREFIX.size()) == MAPPING_PREFIX;
+}
+
+string SnapMapper::to_object_key(const hobject_t &hoid)
+{
+ return OBJECT_PREFIX + shard_prefix + hoid.to_str();
+}
+
+void SnapMapper::object_snaps::encode(bufferlist &bl) const
+{
+ ENCODE_START(1, 1, bl);
+ ::encode(oid, bl);
+ ::encode(snaps, bl);
+ ENCODE_FINISH(bl);
+}
+
+void SnapMapper::object_snaps::decode(bufferlist::iterator &bl)
+{
+ DECODE_START(1, bl);
+ ::decode(oid, bl);
+ ::decode(snaps, bl);
+ DECODE_FINISH(bl);
+}
+
+int SnapMapper::get_snaps(
+ const hobject_t &oid,
+ object_snaps *out)
+{
+ assert(check(oid));
+ set<string> keys;
+ map<string, bufferlist> got;
+ keys.insert(to_object_key(oid));
+ int r = backend.get_keys(keys, &got);
+ if (r < 0)
+ return r;
+ if (got.empty())
+ return -ENOENT;
+ if (out) {
+ bufferlist::iterator bp = got.begin()->second.begin();
+ ::decode(*out, bp);
+ dout(20) << __func__ << " " << oid << " " << out->snaps << dendl;
+ assert(!out->snaps.empty());
+ } else {
+ dout(20) << __func__ << " " << oid << " (out == NULL)" << dendl;
+ }
+ return 0;
+}
+
+void SnapMapper::clear_snaps(
+ const hobject_t &oid,
+ MapCacher::Transaction<std::string, bufferlist> *t)
+{
+ dout(20) << __func__ << " " << oid << dendl;
+ assert(check(oid));
+ set<string> to_remove;
+ to_remove.insert(to_object_key(oid));
+ if (g_conf->subsys.should_gather(ceph_subsys_osd, 20)) {
+ for (auto& i : to_remove) {
+ dout(20) << __func__ << " rm " << i << dendl;
+ }
+ }
+ backend.remove_keys(to_remove, t);
+}
+
+void SnapMapper::set_snaps(
+ const hobject_t &oid,
+ const object_snaps &in,
+ MapCacher::Transaction<std::string, bufferlist> *t)
+{
+ assert(check(oid));
+ map<string, bufferlist> to_set;
+ bufferlist bl;
+ ::encode(in, bl);
+ to_set[to_object_key(oid)] = bl;
+ dout(20) << __func__ << " " << oid << " " << in.snaps << dendl;
+ if (g_conf->subsys.should_gather(ceph_subsys_osd, 20)) {
+ for (auto& i : to_set) {
+ dout(20) << __func__ << " set " << i.first << dendl;
+ }
+ }
+ backend.set_keys(to_set, t);
+}
+
+int SnapMapper::update_snaps(
+ const hobject_t &oid,
+ const set<snapid_t> &new_snaps,
+ const set<snapid_t> *old_snaps_check,
+ MapCacher::Transaction<std::string, bufferlist> *t)
+{
+ dout(20) << __func__ << " " << oid << " " << new_snaps
+ << " was " << (old_snaps_check ? *old_snaps_check : set<snapid_t>())
+ << dendl;
+ assert(check(oid));
+ if (new_snaps.empty())
+ return remove_oid(oid, t);
+
+ object_snaps out;
+ int r = get_snaps(oid, &out);
+ if (r < 0)
+ return r;
+ if (old_snaps_check)
+ assert(out.snaps == *old_snaps_check);
+
+ object_snaps in(oid, new_snaps);
+ set_snaps(oid, in, t);
+
+ set<string> to_remove;
+ for (set<snapid_t>::iterator i = out.snaps.begin();
+ i != out.snaps.end();
+ ++i) {
+ if (!new_snaps.count(*i)) {
+ to_remove.insert(to_raw_key(make_pair(*i, oid)));
+ }
+ }
+ if (g_conf->subsys.should_gather(ceph_subsys_osd, 20)) {
+ for (auto& i : to_remove) {
+ dout(20) << __func__ << " rm " << i << dendl;
+ }
+ }
+ backend.remove_keys(to_remove, t);
+ return 0;
+}
+
+void SnapMapper::add_oid(
+ const hobject_t &oid,
+ const set<snapid_t>& snaps,
+ MapCacher::Transaction<std::string, bufferlist> *t)
+{
+ dout(20) << __func__ << " " << oid << " " << snaps << dendl;
+ assert(check(oid));
+ {
+ object_snaps out;
+ int r = get_snaps(oid, &out);
+ assert(r == -ENOENT);
+ }
+
+ object_snaps _snaps(oid, snaps);
+ set_snaps(oid, _snaps, t);
+
+ map<string, bufferlist> to_add;
+ for (set<snapid_t>::iterator i = snaps.begin();
+ i != snaps.end();
+ ++i) {
+ to_add.insert(to_raw(make_pair(*i, oid)));
+ }
+ if (g_conf->subsys.should_gather(ceph_subsys_osd, 20)) {
+ for (auto& i : to_add) {
+ dout(20) << __func__ << " set " << i.first << dendl;
+ }
+ }
+ backend.set_keys(to_add, t);
+}
+
+int SnapMapper::get_next_objects_to_trim(
+ snapid_t snap,
+ unsigned max,
+ vector<hobject_t> *out)
+{
+ assert(out);
+ assert(out->empty());
+ int r = 0;
+ for (set<string>::iterator i = prefixes.begin();
+ i != prefixes.end() && out->size() < max && r == 0;
+ ++i) {
+ string prefix(get_prefix(snap) + *i);
+ string pos = prefix;
+ while (out->size() < max) {
+ pair<string, bufferlist> next;
+ r = backend.get_next(pos, &next);
+ dout(20) << __func__ << " get_next(" << pos << ") returns " << r
+ << " " << next << dendl;
+ if (r != 0) {
+ break; // Done
+ }
+
+ if (next.first.substr(0, prefix.size()) !=
+ prefix) {
+ break; // Done with this prefix
+ }
+
+ assert(is_mapping(next.first));
+
+ dout(20) << __func__ << " " << next.first << dendl;
+ pair<snapid_t, hobject_t> next_decoded(from_raw(next));
+ assert(next_decoded.first == snap);
+ assert(check(next_decoded.second));
+
+ out->push_back(next_decoded.second);
+ pos = next.first;
+ }
+ }
+ if (out->size() == 0) {
+ return -ENOENT;
+ } else {
+ return 0;
+ }
+}
+
+
+int SnapMapper::remove_oid(
+ const hobject_t &oid,
+ MapCacher::Transaction<std::string, bufferlist> *t)
+{
+ dout(20) << __func__ << " " << oid << dendl;
+ assert(check(oid));
+ return _remove_oid(oid, t);
+}
+
+int SnapMapper::_remove_oid(
+ const hobject_t &oid,
+ MapCacher::Transaction<std::string, bufferlist> *t)
+{
+ dout(20) << __func__ << " " << oid << dendl;
+ object_snaps out;
+ int r = get_snaps(oid, &out);
+ if (r < 0)
+ return r;
+
+ clear_snaps(oid, t);
+
+ set<string> to_remove;
+ for (set<snapid_t>::iterator i = out.snaps.begin();
+ i != out.snaps.end();
+ ++i) {
+ to_remove.insert(to_raw_key(make_pair(*i, oid)));
+ }
+ if (g_conf->subsys.should_gather(ceph_subsys_osd, 20)) {
+ for (auto& i : to_remove) {
+ dout(20) << __func__ << " rm " << i << dendl;
+ }
+ }
+ backend.remove_keys(to_remove, t);
+ return 0;
+}
+
+int SnapMapper::get_snaps(
+ const hobject_t &oid,
+ std::set<snapid_t> *snaps)
+{
+ assert(check(oid));
+ object_snaps out;
+ int r = get_snaps(oid, &out);
+ if (r < 0)
+ return r;
+ if (snaps)
+ snaps->swap(out.snaps);
+ return 0;
+}
Code Review / stor4nfv.git / blobdiff