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[caching] factor metadata_dump out of cache_dump

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This commit is contained in:
Joe Thornber
2013-10-09 10:22:06 +01:00
parent 97f4f0b0bb
commit 9b9b7771e9
4 changed files with 155 additions and 119 deletions
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131
caching/cache_dump.cc
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@ -6,6 +6,7 @@
#include "version.h"
#include "caching/mapping_array.h"
#include "caching/metadata.h"
#include "caching/metadata_dump.h"
#include "caching/xml_format.h"
#include "persistent-data/file_utils.h"
@ -23,75 +24,6 @@ namespace {
bool repair_;
};
string to_string(unsigned char const *data) {
// FIXME: we're assuming the data is zero terminated here
return std::string(reinterpret_cast<char const *>(data));
}
void raise_metadata_damage() {
throw std::runtime_error("metadata contains errors (run cache_check for details).\n"
"perhaps you wanted to run with --repair");
}
//--------------------------------
class mapping_emitter : public mapping_visitor {
public:
mapping_emitter(emitter::ptr e)
: e_(e) {
}
void visit(block_address cblock, mapping const &m) {
if (m.flags_ & M_VALID)
e_->mapping(cblock, m.oblock_, m.flags_ & M_DIRTY);
}
private:
emitter::ptr e_;
};
struct ignore_mapping_damage : public mapping_array_damage::damage_visitor {
virtual void visit(mapping_array_damage::missing_mappings const &d) {}
virtual void visit(mapping_array_damage::invalid_mapping const &d) {}
};
class fatal_mapping_damage : public mapping_array_damage::damage_visitor {
public:
virtual void visit(mapping_array_damage::missing_mappings const &d) {
raise_metadata_damage();
}
virtual void visit(mapping_array_damage::invalid_mapping const &d) {
raise_metadata_damage();
}
};
//--------------------------------
class hint_emitter : public hint_visitor {
public:
hint_emitter(emitter::ptr e)
: e_(e) {
}
virtual void visit(block_address cblock, std::vector<unsigned char> const &data) {
e_->hint(cblock, data);
}
private:
emitter::ptr e_;
};
struct ignore_hint_damage : public hint_array_damage::damage_visitor {
virtual void visit(hint_array_damage::missing_hints const &d) {}
};
class fatal_hint_damage : public hint_array_damage::damage_visitor {
virtual void visit(hint_array_damage::missing_hints const &d) {
raise_metadata_damage();
}
};
//--------------------------------
string const STDOUT_PATH("-");
@ -100,65 +32,26 @@ namespace {
return output == STDOUT_PATH;
}
int dump_(string const &dev, ostream &out, flags const &fs) {
block_manager<>::ptr bm = open_bm(dev, block_io<>::READ_ONLY);
metadata::ptr md(new metadata(bm, metadata::OPEN));
emitter::ptr e = create_xml_emitter(out);
superblock const &sb = md->sb_;
e->begin_superblock(to_string(sb.uuid), sb.data_block_size,
sb.cache_blocks, to_string(sb.policy_name),
sb.policy_hint_size);
e->begin_mappings();
{
namespace mad = mapping_array_damage;
mapping_emitter me(e);
ignore_mapping_damage ignore;
fatal_mapping_damage fatal;
mad::damage_visitor &dv = fs.repair_ ?
static_cast<mad::damage_visitor &>(ignore) :
static_cast<mad::damage_visitor &>(fatal);
walk_mapping_array(*md->mappings_, me, dv);
}
e->end_mappings();
// walk hints
e->begin_hints();
{
using namespace hint_array_damage;
hint_emitter he(e);
ignore_hint_damage ignore;
fatal_hint_damage fatal;
damage_visitor &dv = fs.repair_ ?
static_cast<damage_visitor &>(ignore) :
static_cast<damage_visitor &>(fatal);
md->hints_->walk(he, dv);
}
e->end_hints();
// FIXME: walk discards
e->end_superblock();
return 0;
}
int dump(string const &dev, string const &output, flags const &fs) {
try {
if (want_stdout(output))
return dump_(dev, cout, fs);
else {
block_manager<>::ptr bm = open_bm(dev, block_io<>::READ_ONLY);
metadata::ptr md(new metadata(bm, metadata::OPEN));
if (want_stdout(output)) {
emitter::ptr e = create_xml_emitter(cout);
metadata_dump(md, e, fs.repair_);
} else {
ofstream out(output.c_str());
return dump_(dev, out, fs);
emitter::ptr e = create_xml_emitter(out);
metadata_dump(md, e, fs.repair_);
}
} catch (std::exception &e) {
cerr << e.what() << endl;
return 1;
}
return 0;
}
void usage(ostream &out, string const &cmd) {