Re: [PATCH 2/2] blkdev: __blkdev_direct_IO_simple: make sure to fill up the bio

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