Re: [PATCH 1/2] iov_iter: iterate_folioq: fix handling of offset >= folio size

[David Howells]

asmadeus@xxxxxxxxxxxxx wrote:

> There should be a `if (slot == folioq_nr_slots(folioq)) break` check
> somewhere as well? Or is the iov_iter guaranteed to always 1/ have some
> data and 2/ either be big enough or have remaining data in a step?

We should handle both cases.  I think the other iteration functions
will. iov_iter_extractg_folioq_pages(), for example, wraps it in a
conditional:

		if (offset < fsize) {
			part = umin(part, umin(maxsize - extracted, fsize - offset));
			i->count -= part;
			i->iov_offset += part;
			extracted += part;

			p[nr++] = folio_page(folio, offset / PAGE_SIZE);
		}

David