278 void do_ftruncate(off_t offs)  in do_ftruncate()  argument
280 	ASSERT_EQ(0, ftruncate(m_test_fd, offs)) << strerror(errno);  in do_ftruncate()
281 	ASSERT_EQ(0, ftruncate(m_control_fd, offs)) << strerror(errno);  in do_ftruncate()
282 	m_filesize = offs;  in do_ftruncate()
285 void do_mapread(off_t offs, ssize_t size)  in do_mapread()  argument
293 	pg_offset = offs & page_mask;  in do_mapread()
297 	    offs - pg_offset);  in do_mapread()
302 	ASSERT_EQ(size, pread(m_control_fd, control_buf, size, offs))  in do_mapread()
305 	compare((void*)((char*)p + pg_offset), control_buf, offs, size);  in do_mapread()
311 void do_read(off_t offs, ssize_t size)  in do_read()  argument
320 	r = pread(m_test_fd, test_buf, size, offs);  in do_read()
323 	r = pread(m_control_fd, control_buf, size, offs);  in do_read()
327 	compare(test_buf, control_buf, offs, size);  in do_read()
333 void do_mapwrite(off_t offs, ssize_t size)  in do_mapwrite()  argument
342 	pg_offset = offs & page_mask;  in do_mapwrite()
349 	if (offs + size > m_filesize) {  in do_mapwrite()
354 		do_ftruncate(offs + size);  in do_mapwrite()
358 	    MAP_FILE | MAP_SHARED, m_test_fd, offs - pg_offset);  in do_mapwrite()
362 	ASSERT_EQ(size, pwrite(m_control_fd, buf, size, offs))  in do_mapwrite()
369 void do_write(off_t offs, ssize_t size)  in do_write()  argument
378 	ASSERT_EQ(size, pwrite(m_test_fd, buf, size, offs ))  in do_write()
380 	ASSERT_EQ(size, pwrite(m_control_fd, buf, size, offs))  in do_write()
382 	m_filesize = std::max(m_filesize, offs + size);  in do_write()