iotrace.stp

#! /usr/bin/evn stap
#

probe begin
{
	printf("begin to trace thread IO");
}

probe vfs.read
{
	if (target() == pid()) {
		printf("%s[%ld] - read %d from %s\n", execname(), tid(), bytes_to_read, reverse_path_walk($file->f_path->dentry))
	}
}

probe vfs.write
{
	if (target() == pid())
	{
		printf("%s[%ld] - write %d to %s\n", execname(), tid(), bytes_to_write, reverse_path_walk($file->f_path->dentry))
	}
}

probe vfs.open
{
	if (target() == pid())
	{
		printf("%s[%ld] - open %s\n", execname(), tid(), pathname)
	}
}

probe syscall.close
{
	if (target() == pid())
	{
		file = task_fd_lookup(task_current(), fd)
		printf("%s[%ld] - close %s\n", execname(), tid(), fullpath_struct_path(&@cast(file, "file")->f_path))
	}
}