Re: [PATCH] 9p/virtio: restrict page pinning to user_backed_iter() iovec

[David Howells]

Dominique Martinet <asmadeus@xxxxxxxxxxxxx> wrote:

> FWIW I tried logging and saw ITER_BVEC, ITER_KVEC and ITER_FOLIOQ --
> O_DIRECT writes are seen as BVEC so I guess it's not as direct as I
> expected them to be -- that code could very well be leftovers from
> the switch to iov_iter back in 2015...

ITER_FOLIOQ should only be seen from buffered I/O.  For unbuffered/direct I/O,
user-backed writes are extracted to ITER_BVEC; kernel-backed writes are
sliced, but the original iter type comes down.  For the moment.

David