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SubjectRe: [PATCH 0/5] bio: Direct IO: convert to pin_user_pages_fast()
On Fri, Aug 21, 2020 at 09:20:54PM -0700, John Hubbard wrote:

> Direct IO behavior:
>
> ITER_IOVEC:
> pin_user_pages_fast();
> break;
>
> ITER_KVEC: // already elevated page refcount, leave alone
> ITER_BVEC: // already elevated page refcount, leave alone
> ITER_PIPE: // just, no :)

Why? What's wrong with splice to O_DIRECT file?

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