> @@ -289,6 +308,23 @@ static void brd_submit_bio(struct bio *b
> struct bio_vec bvec;
> struct bvec_iter iter;
>
> + if (bio_op(bio) == REQ_OP_DISCARD) {
> + sector_t len = bio_sectors(bio);
> + sector_t front_pad = -sector & (PAGE_SECTORS - 1);
> + sector += front_pad;
> + if (unlikely(len <= front_pad))
> + goto endio;
> + len -= front_pad;
> + len = round_down(len, PAGE_SECTORS);
> + while (len) {
> + brd_free_page(brd, sector);
> + sector += PAGE_SECTORS;
> + len -= PAGE_SECTORS;
> + cond_resched();
> + }
> + goto endio;
> + }
> +
> bio_for_each_segment(bvec, bio, iter) {
Please add separate helpers to each type of IO and just make the
main submit_bio method a dispatch on the types instead of this
spaghetti code.
> + disk->queue->limits.discard_granularity = PAGE_SIZE;
> + blk_queue_max_discard_sectors(disk->queue, UINT_MAX);
We'll probably want an opt in for this new feature.
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