Re: selective block polling and preadv2/pwritev2 revisited

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On Mon, Jan 04, 2016 at 04:58:38PM +0200, Sagi Grimberg wrote:
> Hi Christoph,
>
>> Note that there are plenty of other use cases for preadv2/pwritev2 as well,
>> but I'd like to concentrate on this one for now.  Example are: non-blocking
>> reads (the original purpose), per-I/O O_SYNC, user space support for T10
>> DIF/DIX applications tags and probably some more.
>
> So I'm trying to understand how can integrity metadata be used here.
> Will the user-app append the meta-data to the data iovec (given there
> is no metadata iovec)? If so, how will we separate data from metadata?

The idea that was floated aroud a few times was to have a flag where
the first half of the vectors would be the data, and the second half
the metadata.
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