linux-master/lib/iov_iter.c

918 				     struct page ***pages, size_t maxsize,
930 	count = want_pages_array(pages, maxsize, offset, maxpages);
937 	maxsize = min_t(size_t, nr * PAGE_SIZE - offset, maxsize);
938 	i->iov_offset += maxsize;
939 	i->count -= maxsize;
940 	return maxsize;
982 		   struct page ***pages, size_t maxsize,
987 	if (maxsize > i->count)
988 		maxsize = i->count;
989 	if (!maxsize)
991 	if (maxsize > MAX_RW_COUNT)
992 		maxsize = MAX_RW_COUNT;
1003 		addr = first_iovec_segment(i, &maxsize);
1006 		n = want_pages_array(pages, maxsize, *start, maxpages);
1012 		maxsize = min_t(size_t, maxsize, res * PAGE_SIZE - *start);
1013 		iov_iter_advance(i, maxsize);
1014 		return maxsize;
1020 		page = first_bvec_segment(i, &maxsize, start);
1021 		n = want_pages_array(pages, maxsize, *start, maxpages);
1027 		maxsize = min_t(size_t, maxsize, n * PAGE_SIZE - *start);
1028 		i->count -= maxsize;
1029 		i->iov_offset += maxsize;
1035 		return maxsize;
1038 		return iter_xarray_get_pages(i, pages, maxsize, maxpages, start);
1043 		size_t maxsize, unsigned maxpages, size_t *start)
1049 	return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages, start);
1054 		struct page ***pages, size_t maxsize, size_t *start)
1060 	len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start);
1406 					     struct page ***pages, size_t maxsize,
1420 	maxpages = want_pages_array(pages, maxsize, offset, maxpages);
1442 	maxsize = min_t(size_t, nr * PAGE_SIZE - offset, maxsize);
1443 	iov_iter_advance(i, maxsize);
1444 	return maxsize;
1452 					   struct page ***pages, size_t maxsize,
1464 		size = min(maxsize, i->bvec->bv_len - skip);
1495 					   struct page ***pages, size_t maxsize,
1508 		size = min(maxsize, i->kvec->iov_len - skip);
1560 					   size_t maxsize,
1577 	addr = first_iovec_segment(i, &maxsize);
1580 	maxpages = want_pages_array(pages, maxsize, offset, maxpages);
1586 	maxsize = min_t(size_t, maxsize, res * PAGE_SIZE - offset);
1587 	iov_iter_advance(i, maxsize);
1588 	return maxsize;
1595  * @maxsize: The maximum amount of iterator to extract
1636 			       size_t maxsize,
1641 	maxsize = min_t(size_t, min_t(size_t, maxsize, i->count), MAX_RW_COUNT);
1642 	if (!maxsize)
1646 		return iov_iter_extract_user_pages(i, pages, maxsize,
1650 		return iov_iter_extract_kvec_pages(i, pages, maxsize,
1654 		return iov_iter_extract_bvec_pages(i, pages, maxsize,
1658 		return iov_iter_extract_xarray_pages(i, pages, maxsize,