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#include "pg_meta.h"
#include <string_view>
#include "crimson/os/cyan_collection.h"
#include "crimson/os/cyan_store.h"
// prefix pgmeta_oid keys with _ so that PGLog::read_log_and_missing() can
// easily skip them
static const string_view infover_key = "_infover"sv;
static const string_view info_key = "_info"sv;
static const string_view biginfo_key = "_biginfo"sv;
static const string_view epoch_key = "_epoch"sv;
static const string_view fastinfo_key = "_fastinfo"sv;
using ceph::os::CyanStore;
PGMeta::PGMeta(CyanStore* store, spg_t pgid)
: store{store},
pgid{pgid}
{}
namespace {
template<typename T>
std::optional<T> find_value(const CyanStore::omap_values_t& values,
string_view key)
{
auto found = values.find(key);
if (found == values.end()) {
return {};
}
auto p = found->second.cbegin();
T value;
decode(value, p);
return std::make_optional(std::move(value));
}
}
seastar::future<epoch_t> PGMeta::get_epoch()
{
auto ch = store->open_collection(coll_t{pgid});
return store->omap_get_values(ch,
pgid.make_pgmeta_oid(),
{string{infover_key},
string{epoch_key}}).then(
[](auto&& values) {
{
// sanity check
auto infover = find_value<__u8>(values, infover_key);
assert(infover);
if (*infover < 10) {
throw std::runtime_error("incompatible pg meta");
}
}
{
auto epoch = find_value<epoch_t>(values, epoch_key);
assert(epoch);
return seastar::make_ready_future<epoch_t>(*epoch);
}
});
}
seastar::future<pg_info_t, PastIntervals> PGMeta::load()
{
auto ch = store->open_collection(coll_t{pgid});
return store->omap_get_values(ch,
pgid.make_pgmeta_oid(),
{string{infover_key},
string{info_key},
string{biginfo_key},
string{fastinfo_key}}).then(
[this](auto&& values) {
{
// sanity check
auto infover = find_value<__u8>(values, infover_key);
assert(infover);
if (infover < 10) {
throw std::runtime_error("incompatible pg meta");
}
}
pg_info_t info;
{
auto found = find_value<pg_info_t>(values, info_key);
assert(found);
info = *std::move(found);
}
PastIntervals past_intervals;
{
using biginfo_t = std::pair<PastIntervals, decltype(info.purged_snaps)>;
auto big_info = find_value<biginfo_t>(values, biginfo_key);
assert(big_info);
past_intervals = std::move(big_info->first);
info.purged_snaps = std::move(big_info->second);
}
{
auto fast_info = find_value<pg_fast_info_t>(values, fastinfo_key);
assert(fast_info);
fast_info->try_apply_to(&info);
}
return seastar::make_ready_future<pg_info_t, PastIntervals>(
std::move(info),
std::move(past_intervals));
});
}
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