On Thu, Jul 19, 2018 at 11:39:18AM +0200, Martin Wilck wrote: > bio_iov_iter_get_pages() returns only pages for a single non-empty > segment of the input iov_iter's iovec. This may be much less than the number > of pages __blkdev_direct_IO_simple() is supposed to process. Call In bio_iov_iter_get_pages(), iov_iter_get_pages() supposes to retrieve as many as possible pages since both 'maxsize' and 'maxpages' are provided to cover all. So the question is why iov_iter_get_pages() doesn't work as expected? Thanks, Ming
