1 files changed, 19 insertions, 44 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 561e8a1..a824e49 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -153,6 +153,9 @@ static void req_bio_endio(struct request *rq, struct bio *bio,
 			nbytes = bio->bi_size;
 		}
 
+		if (unlikely(rq->cmd_flags & REQ_QUIET))
+			set_bit(BIO_QUIET, &bio->bi_flags);
+
 		bio->bi_size -= nbytes;
 		bio->bi_sector += (nbytes >> 9);
 
@@ -265,8 +268,7 @@ void __generic_unplug_device(struct request_queue *q)
 {
 	if (unlikely(blk_queue_stopped(q)))
 		return;
-
-	if (!blk_remove_plug(q))
+	if (!blk_remove_plug(q) && !blk_queue_nonrot(q))
 		return;
 
 	q->request_fn(q);
@@ -404,7 +406,8 @@ EXPORT_SYMBOL(blk_stop_queue);
 void blk_sync_queue(struct request_queue *q)
 {
 	del_timer_sync(&q->unplug_timer);
-	kblockd_flush_work(&q->unplug_work);
+	del_timer_sync(&q->timeout);
+	cancel_work_sync(&q->unplug_work);
 }
 EXPORT_SYMBOL(blk_sync_queue);
 
@@ -1135,7 +1138,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
 static int __make_request(struct request_queue *q, struct bio *bio)
 {
 	struct request *req;
-	int el_ret, nr_sectors, barrier, discard, err;
+	int el_ret, nr_sectors;
 	const unsigned short prio = bio_prio(bio);
 	const int sync = bio_sync(bio);
 	int rw_flags;
@@ -1149,22 +1152,9 @@ static int __make_request(struct request_queue *q, struct bio *bio)
 	 */
 	blk_queue_bounce(q, &bio);
 
-	barrier = bio_barrier(bio);
-	if (unlikely(barrier) && bio_has_data(bio) &&
-	    (q->next_ordered == QUEUE_ORDERED_NONE)) {
-		err = -EOPNOTSUPP;
-		goto end_io;
-	}
-
-	discard = bio_discard(bio);
-	if (unlikely(discard) && !q->prepare_discard_fn) {
-		err = -EOPNOTSUPP;
-		goto end_io;
-	}
-
 	spin_lock_irq(q->queue_lock);
 
-	if (unlikely(barrier) || elv_queue_empty(q))
+	if (unlikely(bio_barrier(bio)) || elv_queue_empty(q))
 		goto get_rq;
 
 	el_ret = elv_merge(q, &req, bio);
@@ -1250,18 +1240,14 @@ get_rq:
 	if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) ||
 	    bio_flagged(bio, BIO_CPU_AFFINE))
 		req->cpu = blk_cpu_to_group(smp_processor_id());
-	if (elv_queue_empty(q))
+	if (!blk_queue_nonrot(q) && elv_queue_empty(q))
 		blk_plug_device(q);
 	add_request(q, req);
 out:
-	if (sync)
+	if (sync || blk_queue_nonrot(q))
 		__generic_unplug_device(q);
 	spin_unlock_irq(q->queue_lock);
 	return 0;
-
-end_io:
-	bio_endio(bio, err);
-	return 0;
 }
 
 /*
@@ -1414,15 +1400,13 @@ static inline void __generic_make_request(struct bio *bio)
 		char b[BDEVNAME_SIZE];
 
 		q = bdev_get_queue(bio->bi_bdev);
-		if (!q) {
+		if (unlikely(!q)) {
 			printk(KERN_ERR
 			       "generic_make_request: Trying to access "
 				"nonexistent block-device %s (%Lu)\n",
 				bdevname(bio->bi_bdev, b),
 				(long long) bio->bi_sector);
-end_io:
-			bio_endio(bio, err);
-			break;
+			goto end_io;
 		}
 
 		if (unlikely(nr_sectors > q->max_hw_sectors)) {
@@ -1459,14 +1443,19 @@ end_io:
 
 		if (bio_check_eod(bio, nr_sectors))
 			goto end_io;
-		if ((bio_empty_barrier(bio) && !q->prepare_flush_fn) ||
-		    (bio_discard(bio) && !q->prepare_discard_fn)) {
+
+		if (bio_discard(bio) && !q->prepare_discard_fn) {
 			err = -EOPNOTSUPP;
 			goto end_io;
 		}
 
 		ret = q->make_request_fn(q, bio);
 	} while (ret);
+
+	return;
+
+end_io:
+	bio_endio(bio, err);
 }
 
 /*
@@ -1716,14 +1705,6 @@ static int __end_that_request_first(struct request *req, int error,
 	while ((bio = req->bio) != NULL) {
 		int nbytes;
 
-		/*
-		 * For an empty barrier request, the low level driver must
-		 * store a potential error location in ->sector. We pass
-		 * that back up in ->bi_sector.
-		 */
-		if (blk_empty_barrier(req))
-			bio->bi_sector = req->sector;
-
 		if (nr_bytes >= bio->bi_size) {
 			req->bio = bio->bi_next;
 			nbytes = bio->bi_size;
@@ -2143,12 +2124,6 @@ int kblockd_schedule_work(struct request_queue *q, struct work_struct *work)
 }
 EXPORT_SYMBOL(kblockd_schedule_work);
 
-void kblockd_flush_work(struct work_struct *work)
-{
-	cancel_work_sync(work);
-}
-EXPORT_SYMBOL(kblockd_flush_work);
-
 int __init blk_dev_init(void)
 {
 	kblockd_workqueue = create_workqueue("kblockd");