[block-cache] unit tests + debug io_engine and copier

unit-tests/test_utils.cc

@@ -3,6 +3,8 @@
 #include "persistent-data/space-maps/core.h"
 
 using namespace persistent_data;
+using namespace std;
+using namespace test;
 
 //----------------------------------------------------------------
 
@@ -21,3 +23,35 @@ test::open_temporary_tm(block_manager<>::ptr bm)
 }
 
 //----------------------------------------------------------------
+
+temp_file::temp_file(string const &name_base, unsigned meg_size)
+	: path_(gen_path(name_base))
+{
+	int fd = ::open(path_.c_str(), O_CREAT | O_RDWR, 0666);
+	if (fd < 0)
+		throw runtime_error("couldn't open file");
+
+	if (::fallocate(fd, 0, 0, 1024 * 1024 * meg_size))
+		throw runtime_error("couldn't fallocate");
+
+	::close(fd);
+}
+
+temp_file::~temp_file()
+{
+//	::unlink(path_.c_str());
+}
+
+string const &
+temp_file::get_path() const
+{
+	return path_;
+}
+
+string
+temp_file::gen_path(string const &base)
+{
+	return string("./") + base + string(".tmp");
+}
+
+//----------------------------------------------------------------