>There seems to be one more reason, take a look at the function
>read_swap_cache_async() in swap_state.c, around line 240:
>
> /*
> * Add it to the swap cache and read its contents.
> */
> lock_page(new_page);
> add_to_swap_cache(new_page, entry);
> rw_swap_page(READ, new_page, wait);
> return new_page;
>
>Here we add an "empty" page to the swap cache and use the
>page lock to protect people from reading this non-up-to-date
>page.
How about reversing the order of the calls - ie. add the page to the cache
only when it's been filled? That would fix the race.
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