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-rw-r--r--block/blk-merge.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 782940c65d8a..aaec38cc37b8 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -188,16 +188,16 @@ void blk_queue_split(struct request_queue *q, struct bio **bio)
switch (bio_op(*bio)) {
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
- split = blk_bio_discard_split(q, *bio, q->bio_split, &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, q->bio_split, &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, q->bio_split, &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);
+ split = blk_bio_segment_split(q, *bio, &q->bio_split, &nsegs);
break;
}
@@ -210,6 +210,16 @@ void blk_queue_split(struct request_queue *q, struct bio **bio)
/* there isn't chance to merge the splitted bio */
split->bi_opf |= REQ_NOMERGE;
+ /*
+ * Since we're recursing into make_request here, ensure
+ * that we mark this bio as already having entered the queue.
+ * If not, and the queue is going away, we can get stuck
+ * forever on waiting for the queue reference to drop. But
+ * that will never happen, as we're already holding a
+ * reference to it.
+ */
+ bio_set_flag(*bio, BIO_QUEUE_ENTERED);
+
bio_chain(split, *bio);
trace_block_split(q, split, (*bio)->bi_iter.bi_sector);
generic_make_request(*bio);
@@ -724,13 +734,12 @@ static struct request *attempt_merge(struct request_queue *q,
}
/*
- * At this point we have either done a back merge
- * or front merge. We need the smaller start_time of
- * the merged requests to be the current request
- * for accounting purposes.
+ * At this point we have either done a back merge or front merge. We
+ * need the smaller start_time_ns of the merged requests to be the
+ * current request for accounting purposes.
*/
- if (time_after(req->start_time, next->start_time))
- req->start_time = next->start_time;
+ if (next->start_time_ns < req->start_time_ns)
+ req->start_time_ns = next->start_time_ns;
req->biotail->bi_next = next->bio;
req->biotail = next->biotail;