thin-provisioning-tools/caching/cache_writeback.cc

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#include "base/progress_monitor.h"
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#include "persistent-data/file_utils.h"
#include "block-cache/copier.h"
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#include "caching/commands.h"
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#include "caching/mapping_array.h"
#include "caching/metadata.h"
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#include "version.h"
#include <boost/optional.hpp>
#include <getopt.h>
#include <string>
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#include <stdexcept>
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#include <boost/optional/optional_io.hpp>
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using namespace bcache;
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using namespace caching;
using namespace boost;
using namespace std;
//----------------------------------------------------------------
namespace {
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template <typename T> T safe_div(T const n, T const d, T const def) {
return (d == T()) ? def : (n / d);
}
//--------------------------------
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struct flags {
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flags()
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: cache_size(4 * 1024 * 1024),
sort_buffers(16 * 1024),
list_failed_blocks(false),
update_metadata(true) {
}
// The sort buffers have a dramatic effect on the
// performance. We give up 10% of the general buffer space
// for them.
void calc_sort_buffer_size() {
size_t sbs = cache_size / 10;
cache_size = cache_size - sbs;
sort_buffers = sbs / sizeof(copy_op);
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}
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using maybe_string = boost::optional<string>;
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size_t cache_size;
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unsigned sort_buffers;
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maybe_string metadata_dev;
maybe_string origin_dev;
maybe_string fast_dev;
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bool list_failed_blocks;
bool update_metadata;
};
//--------------------------------
class copy_batch {
public:
copy_batch(unsigned nr)
: max_(nr),
count_(0),
ops_(nr) {
}
bool space() const {
return count_ < max_;
}
void push_op(copy_op const &op) {
if (!space())
throw runtime_error("copy_batch out of space");
ops_[count_++] = op;
}
void reset() {
count_ = 0;
}
vector<copy_op>::iterator begin() {
return ops_.begin();
}
vector<copy_op>::iterator end() {
return ops_.begin() + count_;
}
private:
unsigned max_;
unsigned count_;
vector<copy_op> ops_;
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};
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class copy_visitor : public mapping_visitor {
public:
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copy_visitor(copier &c, unsigned sort_buffer, bool only_dirty,
bool list_failed_blocks,
progress_monitor &monitor, unsigned cache_blocks)
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: copier_(c),
block_size_(c.get_block_size()),
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only_dirty_(only_dirty),
list_failed_blocks_(list_failed_blocks),
batch_(sort_buffer),
monitor_(monitor),
cache_blocks_(cache_blocks) {
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}
virtual void visit(block_address cblock, mapping const &m) {
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stats_.blocks_scanned = cblock;
update_monitor();
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if (!(m.flags_ & M_VALID))
return;
if (only_dirty_ && !(m.flags_ & M_DIRTY))
return;
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copy_op cop;
cop.src_b = cblock;
cop.src_e = cblock + 1ull;
cop.dest_b = m.oblock_;
// blocks
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stats_.blocks_needed++;
batch_.push_op(cop);
if (!batch_.space())
issue();
}
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void issue() {
auto compare_dest = [](copy_op const &lhs, copy_op const &rhs) {
return lhs.dest_b < rhs.dest_b;
};
sort(batch_.begin(), batch_.end(), compare_dest);
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auto e = batch_.end();
for (auto it = batch_.begin(); it != e; ++it) {
copier_.issue(*it);
stats_.blocks_issued++;
update_monitor();
check_for_completed_copies();
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}
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check_for_completed_copies();
batch_.reset();
}
void check_for_completed_copies(bool block = false) {
optional<copy_op> mop;
do {
if (block)
mop = copier_.wait();
else {
unsigned micro = 0;
mop = copier_.wait(micro);
}
if (mop) {
inc_completed(*mop);
if (!mop->success()) {
failed_blocks_.insert(*mop);
failed_cblocks_.insert(mop->src_b);
}
}
} while (mop);
}
void complete() {
issue();
while (copier_.nr_pending())
check_for_completed_copies(true);
monitor_.update_percent(100);
cerr << "\n";
}
void inc_completed(copy_op const &op) {
stats_.blocks_completed++;
update_monitor();
}
void update_monitor() {
static unsigned call_count = 0;
if (call_count++ % 128)
return;
uint64_t scanned = stats_.blocks_scanned * 100 / cache_blocks_;
uint64_t copied = safe_div<block_address>(stats_.blocks_completed * 100,
stats_.blocks_needed, 100ull);
uint64_t percent = min<uint64_t>(scanned, copied);
monitor_.update_percent(percent);
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}
struct copy_stats {
copy_stats()
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: blocks_scanned(0),
blocks_needed(0),
blocks_issued(0),
blocks_completed(0),
blocks_failed(0) {
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}
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block_address blocks_scanned;
block_address blocks_needed;
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block_address blocks_issued;
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block_address blocks_completed;
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block_address blocks_failed;
};
copy_stats const &get_stats() const {
return stats_;
}
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set<block_address> failed_writebacks() const {
return failed_cblocks_;
}
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private:
copier &copier_;
unsigned block_size_;
bool only_dirty_;
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bool list_failed_blocks_;
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copy_stats stats_;
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copy_batch batch_;
progress_monitor &monitor_;
unsigned cache_blocks_;
set<copy_op> failed_blocks_;
set<block_address> failed_cblocks_;
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};
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//--------------------------------
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using namespace mapping_array_damage;
class ignore_damage_visitor : public damage_visitor {
public:
ignore_damage_visitor()
: corruption_(false) {
}
void visit(missing_mappings const &d) {
cerr << "missing mappings (" << d.keys_.begin_ << ", " << d.keys_.end_ << "]\n";
corruption_ = true;
}
void visit(invalid_mapping const &d) {
cerr << "invalid mapping cblock = " << d.cblock_ << ", oblock = " << d.m_.oblock_ << "\n";
corruption_ = true;
}
bool was_corruption() const {
return corruption_;
}
private:
bool corruption_;
};
bool clean_shutdown(metadata const &md) {
return md.sb_.flags.get_flag(superblock_flags::CLEAN_SHUTDOWN);
}
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void update_metadata(metadata &md, set<block_address> const &failed_writebacks) {
cout << "Updating metadata ... ";
cout.flush();
auto &mappings = md.mappings_;
for (block_address cblock = 0; cblock < mappings->get_nr_entries(); cblock++) {
auto m = mappings->get(cblock);
if (!(m.flags_ & M_VALID))
continue;
if (!(m.flags_ & M_DIRTY))
continue;
if (failed_writebacks.count(cblock))
continue;
m.flags_ &= ~M_DIRTY;
cerr << "clearing dirty flag for block " << cblock << "\n";
mappings->set(cblock, m);
}
md.commit(true);
cout << "done\n";
cout.flush();
}
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int writeback_(flags const &f) {
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block_manager<>::ptr bm = open_bm(*f.metadata_dev, block_manager<>::READ_WRITE);
metadata md(bm);
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// FIXME: we're going to have to copy runs to get the through put with small block sizes
unsigned max_ios = f.cache_size / (md.sb_.data_block_size << SECTOR_SHIFT);
aio_engine engine(max_ios);
copier c(engine, *f.fast_dev, *f.origin_dev,
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md.sb_.data_block_size, f.cache_size);
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auto bar = create_progress_bar("Copying data");
copy_visitor cv(c, f.sort_buffers, clean_shutdown(md), f.list_failed_blocks,
*bar, md.sb_.cache_blocks);
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ignore_damage_visitor dv;
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walk_mapping_array(*md.mappings_, cv, dv);
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cv.complete();
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auto stats = cv.get_stats();
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cout << stats.blocks_issued - stats.blocks_failed << "/"
<< stats.blocks_issued << " blocks successfully copied.\n";
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if (stats.blocks_failed)
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cout << stats.blocks_failed << " blocks were not copied\n";
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if (dv.was_corruption()) {
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cout << "Metadata corruption was found, some data may not have been copied.\n";
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if (f.update_metadata)
cout << "Unable to update metadata.\n";
} else if (f.update_metadata)
update_metadata(md, cv.failed_writebacks());
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return (stats.blocks_failed || dv.was_corruption()) ? 1 : 0;
}
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int writeback(flags const &f) {
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int r;
try {
r = writeback_(f);
} catch (std::exception &e) {
cerr << e.what() << endl;
return 1;
}
return r;
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}
}
//----------------------------------------------------------------
cache_writeback_cmd::cache_writeback_cmd()
: command("cache_writeback")
{
}
void
cache_writeback_cmd::usage(std::ostream &out) const
{
out << "Usage: " << get_name() << " [options]\n"
<< "\t\t--metadata-device <dev>\n"
<< "\t\t--origin-device <dev>\n"
<< "\t\t--fast-device <dev>\n"
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<< "\t\t--buffer-size-meg <size>\n"
<< "\t\t--list-failed-blocks\n"
<< "\t\t--no-metadata-update\n"
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<< "Options:\n"
<< " {-h|--help}\n"
<< " {-V|--version}" << endl;
}
int
cache_writeback_cmd::run(int argc, char **argv)
{
int c;
flags fs;
char const *short_opts = "hV";
option const long_opts[] = {
{ "metadata-device", required_argument, NULL, 0 },
{ "origin-device", required_argument, NULL, 1 },
{ "fast-device", required_argument, NULL, 2 },
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{ "buffer-size-meg", required_argument, NULL, 3 },
{ "list-failed-blocks", no_argument, NULL, 4 },
{ "no-metadata-update", no_argument, NULL, 5 },
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{ "help", no_argument, NULL, 'h'},
{ "version", no_argument, NULL, 'V'},
{ NULL, no_argument, NULL, 0 }
};
while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
switch(c) {
case 0:
fs.metadata_dev = optarg;
break;
case 1:
fs.origin_dev = optarg;
break;
case 2:
fs.fast_dev = optarg;
break;
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case 3:
fs.cache_size = parse_uint64(optarg, "buffer size") * 1024 * 1024;
break;
case 4:
fs.list_failed_blocks = true;
break;
case 5:
fs.update_metadata = false;
break;
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case 'h':
usage(cout);
return 0;
case 'V':
cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
return 0;
default:
usage(cerr);
return 1;
}
}
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fs.calc_sort_buffer_size();
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if (argc != optind) {
usage(cerr);
return 1;
}
if (!fs.metadata_dev) {
cerr << "No metadata device provided.\n\n";
usage(cerr);
return 1;
}
if (!fs.origin_dev) {
cerr << "No origin device provided.\n\n";
usage(cerr);
return 1;
}
if (!fs.fast_dev) {
cerr << "No fast device provided.\n\n";
usage(cerr);
return 1;
}
return writeback(fs);
}
//----------------------------------------------------------------