Re: [PATCH 2/5] migration: never fail in global_state_store()

[Juan Quintela]

Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> wrote:
> Actually global_state_store() can never fail. Let's get rid of extra
> error paths.
>
> To make things clear, use new runstate_get() and use same approach for
> global_state_store() and global_state_store_running().
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>

I don't know.

On one hand, you have removed a lot of code that "can't" happen.

On the other:

> +static void global_state_do_store(RunState state)
>  {
> -    if (!runstate_store((char *)global_state.runstate,
> -                        sizeof(global_state.runstate))) {
> -        error_report("runstate name too big: %s", global_state.runstate);
> -        trace_migrate_state_too_big();
> -        return -EINVAL;
> -    }
> -    return 0;
> +    const char *state_str = RunState_str(state);
> +    assert(strlen(state_str) < sizeof(global_state.runstate));

First: g_assert() please.

Second: We try really hard not to fail during migration and get the
whole qemu back.  One assert is bad.  Specially in a place like this
one, where we know that nothing is broken, simpli that we can't migrate.

Later, Juan.