Re: [PATCH 1/2] readahead: simplify ra->size testing

[Andrew Morton]

Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
>
> On top of "readahead: cleanup blockable_page_cache_readahead()",
>  see http://marc.theaimsgroup.com/?l=linux-kernel&m=110927049500942
> 
>  Currently page_cache_readahead() treats ra->size == 0 (first read)
>  and ra->size == -1 (ra_off was called) separately, but does exactly
>  the same in both cases.
> 
>  With this patch we may assume that the reading starts in 'ra_off()'
>  state, so we don't need to consider the first read as a special case.

So...  the big "how it all works" comment needs an update..
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