Merge branch 'for-2.6.29' of git://git.kernel.dk/linux-2.6-block

* 'for-2.6.29' of git://git.kernel.dk/linux-2.6-block: (43 commits)
  bio: get rid of bio_vec clearing
  bounce: don't rely on a zeroed bio_vec list
  cciss: simplify parameters to deregister_disk function
  cfq-iosched: fix race between exiting queue and exiting task
  loop: Do not call loop_unplug for not configured loop device.
  loop: Flush possible running bios when loop device is released.
  alpha: remove dead BIO_VMERGE_BOUNDARY
  Get rid of CONFIG_LSF
  block: make blk_softirq_init() static
  block: use min_not_zero in blk_queue_stack_limits
  block: add one-hit cache for disk partition lookup
  cfq-iosched: remove limit of dispatch depth of max 4 times quantum
  nbd: tell the block layer that it is not a rotational device
  block: get rid of elevator_t typedef
  aio: make the lookup_ioctx() lockless
  bio: add support for inlining a number of bio_vecs inside the bio
  bio: allow individual slabs in the bio_set
  bio: move the slab pointer inside the bio_set
  bio: only mempool back the largest bio_vec slab cache
  block: don't use plugging on SSD devices
  ...

1 files changed, 19 insertions, 44 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 561e8a1b43a4..a824e49c0d0a 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");