bool do_split = true;
struct bio *new = NULL;
const unsigned max_sectors = get_max_io_size(q, bio);
- unsigned bvecs = 0;
bio_for_each_segment(bv, bio, iter) {
- /*
- * With arbitrary bio size, the incoming bio may be very
- * big. We have to split the bio into small bios so that
- * each holds at most BIO_MAX_PAGES bvecs because
- * bio_clone() can fail to allocate big bvecs.
- *
- * It should have been better to apply the limit per
- * request queue in which bio_clone() is involved,
- * instead of globally. The biggest blocker is the
- * bio_clone() in bio bounce.
- *
- * If bio is splitted by this reason, we should have
- * allowed to continue bios merging, but don't do
- * that now for making the change simple.
- *
- * TODO: deal with bio bounce's bio_clone() gracefully
- * and convert the global limit into per-queue limit.
- */
- if (bvecs++ >= BIO_MAX_PAGES)
- goto split;
-
/*
* If the queue doesn't support SG gaps and adding this
* offset would create a gap, disallow it.
return do_split ? new : NULL;
}
-void blk_queue_split(struct request_queue *q, struct bio **bio,
- struct bio_set *bs)
+void blk_queue_split(struct request_queue *q, struct bio **bio)
{
struct bio *split, *res;
unsigned nsegs;
switch (bio_op(*bio)) {
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
- split = blk_bio_discard_split(q, *bio, bs, &nsegs);
+ split = blk_bio_discard_split(q, *bio, q->bio_split, &nsegs);
break;
case REQ_OP_WRITE_ZEROES:
- split = blk_bio_write_zeroes_split(q, *bio, bs, &nsegs);
+ split = blk_bio_write_zeroes_split(q, *bio, q->bio_split, &nsegs);
break;
case REQ_OP_WRITE_SAME:
- split = blk_bio_write_same_split(q, *bio, bs, &nsegs);
+ split = blk_bio_write_same_split(q, *bio, q->bio_split, &nsegs);
break;
default:
split = blk_bio_segment_split(q, *bio, q->bio_split, &nsegs);
static struct request *attempt_merge(struct request_queue *q,
struct request *req, struct request *next)
{
+ if (!q->mq_ops)
+ lockdep_assert_held(q->queue_lock);
+
if (!rq_mergeable(req) || !rq_mergeable(next))
return NULL;