On Wed, Jan 24, 2024 at 04:53:34PM +0800, zhaoyang.huang wrote:
> void __bio_add_page(struct bio *bio, struct page *page,
> unsigned int len, unsigned int off)
> {
> + int class, level, hint, activity;
> +
> + class = IOPRIO_PRIO_CLASS(bio->bi_ioprio);
> + level = IOPRIO_PRIO_LEVEL(bio->bi_ioprio);
> + hint = IOPRIO_PRIO_HINT(bio->bi_ioprio);
> + activity = IOPRIO_PRIO_ACTIVITY(bio->bi_ioprio);
> +
> WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
> WARN_ON_ONCE(bio_full(bio, len));
>
> bvec_set_page(&bio->bi_io_vec[bio->bi_vcnt], page, len, off);
> bio->bi_iter.bi_size += len;
> bio->bi_vcnt++;
> + activity += bio_page_if_active(bio, page, IOPRIO_NR_ACTIVITY);
> + bio->bi_ioprio = IOPRIO_PRIO_VALUE_ACTIVITY(class, level, hint, activity);
If you need to touch anything in the block layer I/O path
you're doign this wrong. The file system that is submitting the
I/O needs to be in control of the priorities.
must not hack the assignment behind the
