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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "onode_block.h"
namespace crimson::os::seastore {
ceph::bufferlist OnodeBlock::get_delta()
{
bufferlist bl;
assert(deltas.size() <= std::numeric_limits<uint8_t>::max());
uint8_t n_deltas = deltas.size();
ceph::encode(n_deltas, bl);
for (auto& delta : deltas) {
delta->encode(bl);
}
return bl;
}
void OnodeBlock::logical_on_delta_write()
{
// journal submitted to disk, now update the memory
apply_pending_changes(true);
}
void OnodeBlock::apply_delta(const ceph::bufferlist &bl)
{
assert(deltas.empty());
auto p = bl.cbegin();
uint8_t n_deltas = 0;
ceph::decode(n_deltas, p);
for (uint8_t i = 0; i < n_deltas; i++) {
delta_t delta;
delta.decode(p);
mutate(std::move(delta));
}
apply_pending_changes(true);
}
void OnodeBlock::mutate(delta_t&& d)
{
if (is_initial_pending()) {
char* const p = get_bptr().c_str();
mutate_func(p, d);
}
deltas.push_back(std::make_unique<delta_t>(std::move(d)));
}
void OnodeBlock::apply_pending_changes(bool do_cleanup)
{
if (!is_mutation_pending()) {
return;
}
if (share_buffer) {
// do a deep copy so i can change my own copy
get_bptr() = ceph::bufferptr{get_bptr().c_str(),
get_bptr().length()};
share_buffer = false;
}
assert(mutate_func);
char* const p = get_bptr().c_str();
for (auto& delta : deltas) {
mutate_func(p, *delta);
if (do_cleanup) {
delta.reset();
}
}
}
}
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