On Mon, Jan 16, 2023 at 09:01:37AM -0700, Jens Axboe wrote:
> This depends on: 613b14884b85 ("block: handle bio_split_to_limits() NULL return")
Can we sort the NUL vs ERR_PTR thing there first?
> + /*
> + * We're doing more than a bio worth of IO (> 256 pages), and we
> + * cannot guarantee that one of the sub bios will not fail getting
> + * issued FOR NOWAIT as error results are coalesced across all of
> + * them. Be safe and ask for a retry of this from blocking context.
> + */
> + if (iocb->ki_flags & IOCB_NOWAIT)
> + return -EAGAIN;
> return __blkdev_direct_IO(iocb, iter, bio_max_segs(nr_pages));
If the I/O is too a huge page we could easily end up with a single
bio here.
