I think you might be looking for the fadvise64_64() system call.

Kern Sibbald wrote:
> Hello,
>
> Someone on one of these lists recently (last 6 months to 1 year) sent me a 
> suggestion for Linux kernel ioctl()s (or another API) that could be used to 
> advise the kernel how you are going to read or write a file so that the 
> kernel could optimize pre-fetching/writing data.
>
> I seem to have misplaced this email. 
>
> Could someone remind me what the name of those ioctl()s or APIs are?
>
> Best regards,
>
> Kern
>
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