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Merge pull request #149 from mingnus/thin-check-fix-metadata-leaks

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thin_check enhancements
This commit is contained in:
Joe Thornber 2020-08-12 10:28:26 +01:00 committed by GitHub
commit d9965a3906
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GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 417 additions and 62 deletions
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15
base/io_generator.cc
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@ -1,5 +1,7 @@
#include "base/io_generator.h"
#include "base/sequence_generator.h"
#include <chrono>
#include <random>
#include <stdexcept>
#include <cstdlib>
#include <cstring>
@ -31,19 +33,23 @@ namespace {
typedef std::shared_ptr<op_generator> ptr;
op_generator(base::req_op op1)
: op1_(op1), op2_(op1), op1_pct_(100) {
: op1_(op1), op2_(op1), op1_pct_(100),
rand_seed_(std::chrono::high_resolution_clock::now().time_since_epoch().count()),
op_engine_(rand_seed_) {
}
op_generator(base::req_op op1,
base::req_op op2,
unsigned op1_pct)
: op1_(op1), op2_(op2), op1_pct_(op1_pct) {
: op1_(op1), op2_(op2), op1_pct_(op1_pct),
rand_seed_(std::chrono::high_resolution_clock::now().time_since_epoch().count()),
op_engine_(rand_seed_) {
if (op1_pct > 100)
throw std::runtime_error("invalid percentage");
}
base::req_op next_op() {
if (static_cast<unsigned>(std::rand()) % 100 > op1_pct_)
if (op_engine_() % 100 > op1_pct_)
return op2_;
return op1_;
}
@ -52,6 +58,9 @@ namespace {
base::req_op op1_;
base::req_op op2_;
unsigned op1_pct_;
uint64_t rand_seed_;
std::mt19937 op_engine_;
};
//--------------------------------

25
base/sequence_generator.cc
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@ -1,5 +1,7 @@
#include "base/run_set.h"
#include "base/sequence_generator.h"
#include <chrono>
#include <random>
#include <stdexcept>
//----------------------------------------------------------------
@ -80,6 +82,9 @@ namespace {
: begin_(begin),
step_(step),
max_forward_steps_(seq_nr),
rand_seed_(std::chrono::high_resolution_clock::now().time_since_epoch().count()),
results_engine_(rand_seed_),
steps_engine_(rand_seed_),
nr_generated_(0)
{
if (!size || !step || !seq_nr)
@ -93,9 +98,15 @@ namespace {
if (!max_forward_steps_ || max_forward_steps_ > nr_steps_)
throw std::runtime_error("invalid number of forward steps");
if (max_forward_steps_ > 1)
results_distr_ = std::uniform_int_distribution<uint64_t>(0,
nr_steps_ - 1);
if (max_forward_steps_ > 1) {
steps_distr_ = std::uniform_int_distribution<uint64_t>(1,
max_forward_steps_);
reset_forward_generator();
}
}
uint64_t next() {
// FIXME: eliminate if-else
@ -109,7 +120,7 @@ namespace {
void reset_forward_generator() {
uint64_t begin = peek_random_step();
unsigned seq_nr = (std::rand() % max_forward_steps_) + 1;
unsigned seq_nr = steps_distr_(steps_engine_);
base::run_set<uint64_t>::const_iterator it = rand_map_.upper_bound(begin);
if (it != rand_map_.end())
seq_nr = std::min<uint64_t>(seq_nr, *it->begin_ - begin);
@ -148,12 +159,13 @@ namespace {
}
}
uint64_t peek_random_step() const {
// TODO: improve the complexity of generating unique sequence
uint64_t peek_random_step() {
uint64_t step_idx;
bool found = true;
while (found) {
step_idx = std::rand() % nr_steps_;
step_idx = results_distr_(results_engine_);
found = rand_map_.member(step_idx);
}
@ -164,7 +176,12 @@ namespace {
uint64_t nr_steps_;
uint64_t step_;
unsigned max_forward_steps_;
uint64_t rand_seed_;
std::mt19937_64 results_engine_;
std::mt19937_64 steps_engine_;
std::uniform_int_distribution<uint64_t> results_distr_;
std::uniform_int_distribution<uint64_t> steps_distr_;
base::run_set<uint64_t> rand_map_;
uint64_t nr_generated_;
forward_sequence_generator forward_gen_;

11
persistent-data/block_counter.h
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@ -33,6 +33,12 @@ namespace persistent_data {
public:
typedef std::map<block_address, unsigned> count_map;
block_counter(): stop_on_error_(false) {}
block_counter(bool stop_on_error)
: stop_on_error_(stop_on_error) {
}
virtual ~block_counter() {}
virtual void inc(block_address b) {
@ -52,8 +58,13 @@ namespace persistent_data {
return counts_;
}
virtual bool stop_on_error() {
return stop_on_error_;
}
private:
count_map counts_;
bool stop_on_error_;
};
//----------------------------------------------------------------

8
persistent-data/data-structures/btree_counter.h
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@ -16,7 +16,10 @@ namespace persistent_data {
counting_visitor(block_counter &bc, ValueCounter &vc)
: bc_(bc),
vc_(vc) {
vc_(vc),
error_outcome_(bc.stop_on_error() ?
tree::visitor::RETHROW_EXCEPTION :
tree::visitor::EXCEPTION_HANDLED) {
}
virtual bool visit_internal(node_location const &l,
@ -51,7 +54,7 @@ namespace persistent_data {
error_outcome error_accessing_node(node_location const &l, block_address b,
std::string const &what) {
return btree<Levels, ValueTraits>::visitor::EXCEPTION_HANDLED;
return error_outcome_;
}
private:
@ -110,6 +113,7 @@ namespace persistent_data {
ValueCounter &vc_;
btree_node_checker checker_;
boost::optional<uint64_t> last_leaf_key_[Levels];
error_outcome error_outcome_;
};
}

6
persistent-data/space-maps/core.cc
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@ -190,10 +190,12 @@ namespace {
set_bits_(b, c);
}
if (old_c == 0 && c > 0)
if (old_c == 0 && c > 0) {
nr_free_--;
if (b == search_start_)
search_start_++;
else if (old_c > 0 && c == 0) {
} else if (old_c > 0 && c == 0) {
if (b < search_start_)
search_start_ = b;

67
persistent-data/space-maps/disk.cc
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@ -43,11 +43,19 @@ namespace {
bitmap_header const *data = reinterpret_cast<bitmap_header const *>(raw);
crc32c sum(BITMAP_CSUM_XOR);
sum.append(&data->not_used, MD_BLOCK_SIZE - sizeof(uint32_t));
if (sum.get_sum() != to_cpu<uint32_t>(data->csum))
throw checksum_error("bad checksum in space map bitmap");
if (sum.get_sum() != to_cpu<uint32_t>(data->csum)) {
std::ostringstream out;
out << "bad checksum in space map bitmap (block "
<< location << ")";
throw checksum_error(out.str());
}
if (to_cpu<uint64_t>(data->blocknr) != location)
throw checksum_error("bad block nr in space map bitmap");
if (to_cpu<uint64_t>(data->blocknr) != location) {
std::ostringstream out;
out << "bad block nr in space map bitmap (block "
<< location << ")";
throw checksum_error(out.str());
}
}
virtual bool check_raw(void const *raw) const {
@ -77,11 +85,19 @@ namespace {
metadata_index const *mi = reinterpret_cast<metadata_index const *>(raw);
crc32c sum(INDEX_CSUM_XOR);
sum.append(&mi->padding_, MD_BLOCK_SIZE - sizeof(uint32_t));
if (sum.get_sum() != to_cpu<uint32_t>(mi->csum_))
throw checksum_error("bad checksum in metadata index block");
if (sum.get_sum() != to_cpu<uint32_t>(mi->csum_)) {
std::ostringstream out;
out << "bad checksum in metadata index block (block "
<< location << ")";
throw checksum_error(out.str());
}
if (to_cpu<uint64_t>(mi->blocknr_) != location)
throw checksum_error("bad block nr in metadata index block");
if (to_cpu<uint64_t>(mi->blocknr_) != location) {
std::ostringstream out;
out << "bad block nr in metadata index block (block "
<< location << ")";
throw checksum_error(out.str());
}
}
virtual bool check_raw(void const *raw) const {
@ -639,21 +655,30 @@ namespace {
//--------------------------------
struct index_entry_counter {
index_entry_counter(block_counter &bc)
: bc_(bc) {
index_entry_counter(transaction_manager &tm,
block_counter &bc)
: tm_(tm),
bc_(bc),
bitmap_validator_(new bitmap_block_validator()) {
}
void visit(btree_detail::node_location const &loc, index_entry const &ie) {
if (ie.blocknr_ != 0)
if (!ie.blocknr_)
return;
block_manager::read_ref rr = tm_.read_lock(ie.blocknr_, bitmap_validator_);
if (rr.data())
bc_.inc(ie.blocknr_);
}
private:
transaction_manager &tm_;
block_counter &bc_;
bcache::validator::ptr bitmap_validator_;
};
virtual void count_metadata(block_counter &bc) const {
index_entry_counter vc(bc);
index_entry_counter vc(tm_, bc);
count_btree_blocks(bitmaps_, bc, vc);
}
@ -705,14 +730,16 @@ namespace {
typedef std::shared_ptr<metadata_index_store> ptr;
metadata_index_store(transaction_manager &tm)
: tm_(tm) {
: tm_(tm),
bitmap_validator_(new bitmap_block_validator()) {
block_manager::write_ref wr = tm_.new_block(index_validator());
bitmap_root_ = wr.get_location();
}
metadata_index_store(transaction_manager &tm, block_address root, block_address nr_indexes)
: tm_(tm),
bitmap_root_(root) {
bitmap_root_(root),
bitmap_validator_(new bitmap_block_validator()) {
resize(nr_indexes);
load_ies();
}
@ -723,8 +750,17 @@ namespace {
for (unsigned i = 0; i < entries_.size(); i++) {
block_address b = entries_[i].blocknr_;
if (b != 0)
if (b == 0)
continue;
try {
block_manager::read_ref rr = tm_.read_lock(b, bitmap_validator_);
if (rr.data())
bc.inc(b);
} catch (std::exception &e) {
if (bc.stop_on_error())
throw;
}
}
}
@ -786,6 +822,7 @@ namespace {
transaction_manager &tm_;
block_address bitmap_root_;
std::vector<index_entry> entries_;
bcache::validator::ptr bitmap_validator_;
};
}

6
persistent-data/transaction_manager.h
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@ -69,6 +69,12 @@ namespace persistent_data {
bm_->prefetch(b);
}
// mark a block as shadowed,
// for the purpose of in-place modification
void mark_shadowed(block_address b) {
add_shadow(b);
}
private:
void add_shadow(block_address b);
void remove_shadow(block_address b);

8
thin-provisioning/damage_generator.cc
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@ -1,3 +1,5 @@
#include <chrono>
#include <random>
#include "damage_generator.h"
using namespace thin_provisioning;
@ -13,12 +15,14 @@ namespace {
base::run_set<block_address> visited;
block_address nr_visited = 0;
srand(time(NULL));
uint64_t rand_seed(std::chrono::high_resolution_clock::now().time_since_epoch().count());
std::mt19937 rand_engine(rand_seed);
while (nr_blocks) {
if (nr_visited == sm_size)
break;
block_address b = rand() % sm_size;
block_address b = rand_engine() % sm_size;
if (visited.member(b))
continue;

40
thin-provisioning/metadata_checker.cc
View File

@ -274,6 +274,17 @@ namespace {
return err;
}
void mark_sm_shadowed(transaction_manager::ptr tm, persistent_space_map::ptr sm) {
block_counter bc(true);
sm->count_metadata(bc);
block_address nr_blocks = sm->get_nr_blocks();
for (block_address b = 0; b < nr_blocks; b++) {
if (bc.get_count(b))
tm->mark_shadowed(b);
}
}
error_state clear_leaked_blocks(space_map::ptr actual,
block_counter const &expected) {
error_state err = NO_ERROR;
@ -296,7 +307,8 @@ namespace {
out << "checking space map counts" << end_message();
nested_output::nest _ = out.push();
count_metadata(tm, sb, bc);
if (!count_metadata(tm, sb, bc))
return FATAL;
// Finally we need to check the metadata space map agrees
// with the counts we've just calculated.
@ -318,7 +330,7 @@ namespace {
} else {
for (block_address b = 0; b < nr_blocks; b++) {
auto a_count = actual->get_count(b);
auto e_count = actual->get_count(b);
auto e_count = expected->get_count(b);
if (a_count != e_count) {
out << "data reference counts differ for block " << b
@ -358,6 +370,7 @@ namespace {
options_(check_opts),
out_(cerr, 2),
info_out_(cout, 0),
expected_rc_(true), // set stop on the first error
err_(NO_ERROR) {
if (output_opts == OUTPUT_QUIET) {
@ -386,8 +399,11 @@ namespace {
print_info(tm, sb, info_out_);
if (options_.sm_opts_ == check_options::SPACE_MAP_FULL) {
// data block reference counting is disabled
// until that there's a better solution in space
// and time complexity
space_map::ptr data_sm{open_disk_sm(*tm, &sb.data_space_map_root_)};
optional<space_map::ptr> core_sm{create_core_map(data_sm->get_nr_blocks())};
optional<space_map::ptr> core_sm;
err_ << examine_data_mappings(tm, sb, options_.data_mapping_opts_, out_, core_sm);
if (err_ == FATAL)
@ -397,15 +413,15 @@ namespace {
// then we should check the space maps too.
err_ << examine_metadata_space_map(tm, sb, options_.sm_opts_, out_, expected_rc_);
// check the data space map
if (core_sm)
// verify ref-counts of data blocks
if (err_ != FATAL && core_sm)
err_ << compare_space_maps(data_sm, *core_sm, out_);
} else
err_ << examine_data_mappings(tm, sb, options_.data_mapping_opts_, out_,
optional<space_map::ptr>());
}
bool fix_metadata_leaks() {
bool fix_metadata_leaks(bool open_transaction) {
if (!verify_preconditions_before_fixing()) {
out_ << "metadata has not been fully examined" << end_message();
return false;
@ -424,6 +440,9 @@ namespace {
open_metadata_sm(*tm, static_cast<void const*>(&sb.metadata_space_map_root_));
tm->set_sm(metadata_sm);
if (!open_transaction)
mark_sm_shadowed(tm, metadata_sm);
err_ = clear_leaked_blocks(metadata_sm, expected_rc_);
if (err_ != NO_ERROR)
@ -449,6 +468,10 @@ namespace {
block_manager::ptr bm = open_bm(path_, block_manager::READ_WRITE);
superblock_detail::superblock sb = read_superblock(bm);
if (!sb.get_needs_check_flag())
return true;
sb.set_needs_check_flag(false);
write_superblock(bm, sb);
@ -553,7 +576,8 @@ check_options::check_options()
sm_opts_(SPACE_MAP_FULL),
ignore_non_fatal_(false),
fix_metadata_leaks_(false),
clear_needs_check_(false) {
clear_needs_check_(false),
open_transaction_(false) {
}
void check_options::set_superblock_only() {
@ -625,7 +649,7 @@ thin_provisioning::check_metadata(std::string const &path,
checker.check();
if (check_opts.fix_metadata_leaks_)
checker.fix_metadata_leaks();
checker.fix_metadata_leaks(check_opts.open_transaction_);
if (check_opts.fix_metadata_leaks_ ||
check_opts.clear_needs_check_)
checker.clear_needs_check_flag();

1
thin-provisioning/metadata_checker.h
View File

@ -55,6 +55,7 @@ namespace thin_provisioning {
bool ignore_non_fatal_;
bool fix_metadata_leaks_;
bool clear_needs_check_;
bool open_transaction_;
};
enum output_options {

28
thin-provisioning/metadata_counter.cc
View File

@ -8,7 +8,7 @@ using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
void count_trees(transaction_manager::ptr tm,
bool count_trees(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
block_counter &bc) {
@ -27,11 +27,15 @@ namespace {
mapping_tree_detail::block_traits::ref_counter(space_map::ptr()));
count_btree_blocks(mtree, bc, vc);
}
return true;
}
void count_space_maps(transaction_manager::ptr tm,
bool count_space_maps(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
block_counter &bc) {
bool ret = true;
// Count the metadata space map (no-throw)
try {
persistent_space_map::ptr metadata_sm =
@ -39,36 +43,46 @@ namespace {
metadata_sm->count_metadata(bc);
} catch (std::exception &e) {
cerr << e.what() << endl;
ret = false;
}
// Count the data space map (no-throw)
{
try {
persistent_space_map::ptr data_sm =
open_disk_sm(*tm, static_cast<void const *>(&sb.data_space_map_root_));
data_sm->count_metadata(bc);
} catch (std::exception &e) {
cerr << e.what() << endl;
ret = false;
}
return ret;
}
}
//----------------------------------------------------------------
void thin_provisioning::count_metadata(transaction_manager::ptr tm,
bool thin_provisioning::count_metadata(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
block_counter &bc,
bool skip_metadata_snap) {
bool ret = true;
// Count the superblock
bc.inc(superblock_detail::SUPERBLOCK_LOCATION);
count_trees(tm, sb, bc);
ret &= count_trees(tm, sb, bc);
// Count the metadata snap, if present
if (!skip_metadata_snap && sb.metadata_snap_ != superblock_detail::SUPERBLOCK_LOCATION) {
bc.inc(sb.metadata_snap_);
superblock_detail::superblock snap = read_superblock(tm->get_bm(), sb.metadata_snap_);
count_trees(tm, snap, bc);
ret &= count_trees(tm, snap, bc);
}
count_space_maps(tm, sb, bc);
ret &= count_space_maps(tm, sb, bc);
return ret;
}
//----------------------------------------------------------------

2
thin-provisioning/metadata_counter.h
View File

@ -7,7 +7,7 @@
//----------------------------------------------------------------
namespace thin_provisioning {
void count_metadata(transaction_manager::ptr tm,
bool count_metadata(transaction_manager::ptr tm,
superblock_detail::superblock const &sb,
block_counter &bc,
bool skip_metadata_snap = false);

260
unit-tests/space_map_t.cc
View File

@ -20,7 +20,9 @@
#include "persistent-data/space-maps/disk.h"
#include "persistent-data/space-maps/core.h"
#include "persistent-data/space-maps/careful_alloc.h"
#include "persistent-data/space-maps/disk_structures.h"
#include "persistent-data/space-maps/recursive.h"
#include "test_utils.h"
using namespace std;
using namespace persistent_data;
@ -29,14 +31,16 @@ using namespace testing;
//----------------------------------------------------------------
namespace {
block_address const NR_BLOCKS = 1000; // FIXME: bump up
unsigned const ENTRIES_PER_BLOCK = (MD_BLOCK_SIZE - sizeof(sm_disk_detail::bitmap_header)) * 4;
unsigned const NR_BITMAPS = 2;
unsigned const NR_BLOCKS = ENTRIES_PER_BLOCK * NR_BITMAPS;
block_address const SUPERBLOCK = 0;
block_address const MAX_LOCKS = 8;
unsigned const MAX_LOCKS = 8;
class SpaceMapTests : public Test {
public:
SpaceMapTests()
: bm_(new block_manager("./test.data", NR_BLOCKS, MAX_LOCKS, block_manager::READ_WRITE)),
: bm_(test::create_bm(NR_BLOCKS)),
sm_(create_core_map(NR_BLOCKS)),
tm_(bm_, sm_) {
}
@ -229,8 +233,89 @@ namespace {
test_high_ref_counts(SMCreator::create(tm_));
}
void
copy_space_maps(space_map::ptr lhs, space_map::ptr rhs) {
block_manager::ptr bm_;
space_map::ptr sm_;
transaction_manager tm_;
};
//--------------------------------
class MetadataSpaceMapTests : public Test {
public:
MetadataSpaceMapTests() {
memset(metadata_sm_root_, 0, sizeof(metadata_sm_root_));
create_metadata_sm(NR_BLOCKS);
}
void commit() {
metadata_sm_->commit();
ASSERT_THAT(metadata_sm_->root_size(), Le(sizeof(metadata_sm_root_)));
metadata_sm_->copy_root(metadata_sm_root_, sizeof(metadata_sm_root_));
}
void open() {
bm_ = block_manager::ptr(new block_manager("./test.data", NR_BLOCKS, MAX_LOCKS, block_manager::READ_WRITE));
space_map::ptr core_sm{create_core_map(NR_BLOCKS)};
tm_ = transaction_manager::ptr(new transaction_manager(bm_, core_sm));
metadata_sm_ = persistent_data::open_metadata_sm(*tm_, metadata_sm_root_);
tm_->set_sm(metadata_sm_);
}
void create_data_sm(block_address nr_blocks) {
data_sm_ = create_disk_sm(*tm_, nr_blocks);
}
void load_ies(std::vector<sm_disk_detail::index_entry> &entries) {
sm_disk_detail::sm_root v;
get_root(v);
block_address nr_indexes = (v.nr_blocks_ + ENTRIES_PER_BLOCK - 1) / ENTRIES_PER_BLOCK;
entries.resize(nr_indexes);
ASSERT_EQ(entries.size(), NR_BITMAPS);
block_manager::read_ref rr =
bm_->read_lock(v.bitmap_root_, index_validator());
sm_disk_detail::metadata_index const *mdi = reinterpret_cast<sm_disk_detail::metadata_index const *>(rr.data());
for (block_address i = 0; i < nr_indexes; i++) {
sm_disk_detail::index_entry_traits::unpack(*(mdi->index + i), entries[i]);
ASSERT_EQ(metadata_sm_->get_count(entries[i].blocknr_), 1u);
}
}
// note that the index_block is not shadowed until space map commit
void get_root(sm_disk_detail::sm_root &v) const {
sm_disk_detail::sm_root_disk d;
metadata_sm_->copy_root(&d, sizeof(d));
sm_disk_detail::sm_root_traits::unpack(d, v);
}
void mark_shadowed() {
block_counter bc(true);
metadata_sm_->count_metadata(bc);
block_address nr_blocks = metadata_sm_->get_nr_blocks();
for (block_address b = 0; b < nr_blocks; b++) {
if (bc.get_count(b))
tm_->mark_shadowed(b);
}
}
checked_space_map::ptr metadata_sm_;
checked_space_map::ptr data_sm_;
private:
void create_metadata_sm(block_address nr_blocks) {
bm_ = test::create_bm(NR_BLOCKS);
space_map::ptr core_sm{create_core_map(nr_blocks)};
tm_ = transaction_manager::ptr(new transaction_manager(bm_, core_sm));
metadata_sm_ = persistent_data::create_metadata_sm(*tm_, nr_blocks);
copy_space_maps(metadata_sm_, core_sm);
tm_->set_sm(metadata_sm_);
}
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)
@ -239,8 +324,9 @@ namespace {
}
block_manager::ptr bm_;
space_map::ptr sm_;
transaction_manager tm_;
transaction_manager::ptr tm_;
unsigned char metadata_sm_root_[128];
};
}
@ -273,17 +359,157 @@ TEST_F(SpaceMapTests, test_sm_metadata)
test_sm_reopen<sm_metadata_creator>();
}
TEST_F(SpaceMapTests, test_metadata_and_disk)
{
block_manager::ptr bm(
new block_manager("./test.data", NR_BLOCKS, MAX_LOCKS, block_manager::READ_WRITE));
space_map::ptr core_sm{create_core_map(NR_BLOCKS)};
transaction_manager::ptr tm(new transaction_manager(bm, core_sm));
persistent_space_map::ptr metadata_sm = persistent_data::create_metadata_sm(*tm, NR_BLOCKS);
copy_space_maps(metadata_sm, core_sm);
tm->set_sm(metadata_sm);
//----------------------------------------------------------------
persistent_space_map::ptr data_sm_ = create_disk_sm(*tm, NR_BLOCKS * 2);
TEST_F(MetadataSpaceMapTests, test_metadata_and_disk)
{
create_data_sm(NR_BLOCKS * 2);
}
// Test whether sm_recursive protected allocated blocks in a recursion
// (github issue #70)
TEST_F(MetadataSpaceMapTests, test_allocate_blocks)
{
commit();
open();
std::vector<sm_disk_detail::index_entry> entries;
load_ies(entries);
block_address nr_allocatable = metadata_sm_->get_nr_free() - NR_BITMAPS;
block_address nr_allocated = 0;
while (true) {
space_map::maybe_block b = metadata_sm_->new_block();
if (!b)
break;
++nr_allocated;
for (auto const &e : entries)
ASSERT_NE(*b, e.blocknr_);
}
ASSERT_EQ(nr_allocated, nr_allocatable);
for (auto const &e : entries)
ASSERT_EQ(metadata_sm_->get_count(e.blocknr_), 0u);
}
// Test whether sm_careful_alloc protects released blocks in a recursion.
// (github issue #97)
TEST_F(MetadataSpaceMapTests, test_multiple_shadows_by_dec)
{
// Occupy all the blocks belonging to the first bitmap,
// to change the position of further allocated blocks.
for (unsigned i = 0; i < ENTRIES_PER_BLOCK; i++)
metadata_sm_->new_block();
// the extra two blocks are the index block and the ref-count tree root
ASSERT_EQ(metadata_sm_->get_nr_free(), ENTRIES_PER_BLOCK - NR_BITMAPS - 2);
commit();
open();
std::vector<sm_disk_detail::index_entry> entries;
load_ies(entries);
// Releasing the block belonging to the second bitmap results in
// shadowing the second, then the first bitmap blocks.
// The shadow operations must not reuse the released block.
block_address last = metadata_sm_->get_nr_blocks() - metadata_sm_->get_nr_free() - 1;
ASSERT_EQ(metadata_sm_->get_count(last), 1u);
metadata_sm_->dec(last);
// assert that the released blocks are not used
ASSERT_EQ(metadata_sm_->get_count(last), 0u);
for (auto const &e : entries)
ASSERT_EQ(metadata_sm_->get_count(e.blocknr_), 0u);
ASSERT_EQ(metadata_sm_->get_nr_free(), ENTRIES_PER_BLOCK - NR_BITMAPS - 1);
// check ref-counts of shadowed bitmaps
commit();
open();
load_ies(entries);
}
// Test whether sm_recursive protects allocated blocks in a recursion
// (github issue #70)
TEST_F(MetadataSpaceMapTests, test_multiple_shadows_by_inc)
{
// Occupy all the blocks belonging to the first bitmap,
// to change the position of further allocated blocks.
for (unsigned i = 0; i < ENTRIES_PER_BLOCK; i++)
metadata_sm_->new_block();
// the extra two blocks are the index block and the ref-count tree root
ASSERT_EQ(metadata_sm_->get_nr_free(), ENTRIES_PER_BLOCK - NR_BITMAPS - 2);
commit();
open();
std::vector<sm_disk_detail::index_entry> entries;
load_ies(entries);
// allocating a block results in shadowing the second,
// then the first bitmap
space_map::maybe_block b = metadata_sm_->new_block();
// assert reference counts
ASSERT_EQ(metadata_sm_->get_count(*b), 1u);
for (auto const &e : entries)
ASSERT_EQ(metadata_sm_->get_count(e.blocknr_), 0u);
ASSERT_EQ(metadata_sm_->get_nr_free(), ENTRIES_PER_BLOCK - NR_BITMAPS - 3);
// check ref-counts of shadowed bitmaps
commit();
open();
load_ies(entries);
}
// Test whether intended in-place modification works
TEST_F(MetadataSpaceMapTests, test_intended_in_place_modification)
{
sm_disk_detail::sm_root root;
get_root(root);
std::vector<sm_disk_detail::index_entry> entries;
load_ies(entries);
commit();
open();
mark_shadowed();
// the bitmaps won't be shadowed,
// all the free blocks therefore become allocatable
block_address nr_allocatable = metadata_sm_->get_nr_free();
block_address nr_allocated = 0;
while (true) {
space_map::maybe_block b = metadata_sm_->new_block();
if (!b)
break;
++nr_allocated;
for (auto const &e : entries)
ASSERT_NE(*b, e.blocknr_);
}
ASSERT_EQ(nr_allocated, nr_allocatable);
commit();
open();
sm_disk_detail::sm_root root2;
get_root(root2);
std::vector<sm_disk_detail::index_entry> entries2;
load_ies(entries2);
// assert the space map block locations are not changed
ASSERT_EQ(root.bitmap_root_, root2.bitmap_root_);
ASSERT_EQ(root.ref_count_root_, root2.ref_count_root_);
ASSERT_EQ(entries.size(), entries2.size());
for (unsigned i = 0; i < entries.size(); i++)
ASSERT_EQ(entries[i].blocknr_, entries2[i].blocknr_);
ASSERT_EQ(root2.nr_allocated_, root.nr_allocated_ + nr_allocated);
}
//----------------------------------------------------------------