thin-provisioning-tools/era/metadata.cc
Nikos Tsironis 9f30793355 [era_invalidate] Don't read the live metadata when the --metadata-snapshot option is provided
Until now, 'era_invalidate' read the live metadata (superblock), instead
of the metadata snapshot, when using the --metadata-snapshot parameter.

Fix this by passing the location of the metadata snapshot to
'open_metadata()', when a metadata snapshot is used.

Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
2022-01-05 12:30:02 +02:00

116 lines
2.5 KiB
C++

#include "era/metadata.h"
#include "persistent-data/space-maps/core.h"
using namespace era;
//----------------------------------------------------------------
namespace {
// FIXME: duplication
transaction_manager::ptr
open_tm(block_manager::ptr bm) {
auto nr_blocks = bm->get_nr_blocks();
if (!nr_blocks)
throw runtime_error("Metadata is not large enough for superblock.");
space_map::ptr sm{create_core_map(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, metadata_snap);
}
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_);
}
//----------------------------------------------------------------