thin-provisioning-tools/era/metadata.cc
Joe Thornber a7c96c0e1e [everything] Fix circular shared pointer references.
We had a cycle from transaction_manager <-> space_map, and also from
the ref_counters back up to the tm.

This prevented objects being destroyed when various programs exited.

From now on we'll try and only use a shared ptr if ownership is
implied.  Otherwise a reference will be used (eg, for up pointers).
2014-08-26 11:14:49 +01:00

114 lines
2.4 KiB
C++

#include "era/metadata.h"
#include "persistent-data/space-maps/core.h"
using namespace era;
//----------------------------------------------------------------
namespace {
unsigned const METADATA_CACHE_SIZ = 1024;
// FIXME: duplication
transaction_manager::ptr
open_tm(block_manager<>::ptr bm) {
space_map::ptr sm(new core_map(bm->get_nr_blocks()));
sm->inc(SUPERBLOCK_LOCATION);
transaction_manager::ptr tm(new transaction_manager(bm, sm));
return tm;
}
void
copy_space_maps(space_map::ptr lhs, space_map::ptr rhs) {
for (block_address b = 0; b < rhs->get_nr_blocks(); b++) {
uint32_t count = rhs->get_count(b);
if (count > 0)
lhs->set_count(b, rhs->get_count(b));
}
}
}
metadata::metadata(block_manager<>::ptr bm, open_type ot)
{
switch (ot) {
case CREATE:
create_metadata(bm);
break;
case OPEN:
open_metadata(bm);
break;
}
}
metadata::metadata(block_manager<>::ptr bm, block_address metadata_snap)
{
open_metadata(bm);
}
void
metadata::create_metadata(block_manager<>::ptr bm)
{
tm_ = open_tm(bm);
space_map::ptr core = tm_->get_sm();
metadata_sm_ = create_metadata_sm(*tm_, tm_->get_bm()->get_nr_blocks());
copy_space_maps(metadata_sm_, core);
tm_->set_sm(metadata_sm_);
writeset_tree_ = writeset_tree::ptr(new writeset_tree(*tm_, era_detail_traits::ref_counter(tm_)));
era_array_ = era_array::ptr(new era_array(*tm_,
uint32_traits::ref_counter()));
}
void
metadata::open_metadata(block_manager<>::ptr bm, block_address loc)
{
tm_ = open_tm(bm);
sb_ = read_superblock(tm_->get_bm(), loc);
writeset_tree_ = writeset_tree::ptr(new writeset_tree(*tm_,
sb_.writeset_tree_root,
era_detail_traits::ref_counter(tm_)));
era_array_ = era_array::ptr(new era_array(*tm_,
uint32_traits::ref_counter(),
sb_.era_array_root,
sb_.nr_blocks));
}
void
metadata::commit()
{
commit_space_map();
commit_writesets();
commit_era_array();
commit_superblock();
}
void
metadata::commit_space_map()
{
metadata_sm_->commit();
metadata_sm_->copy_root(&sb_.metadata_space_map_root, sizeof(sb_.metadata_space_map_root));
}
void
metadata::commit_writesets()
{
sb_.writeset_tree_root = writeset_tree_->get_root();
}
void
metadata::commit_era_array()
{
sb_.era_array_root = era_array_->get_root();
}
void
metadata::commit_superblock()
{
write_superblock(tm_->get_bm(), sb_);
}
//----------------------------------------------------------------