119 files changed, 151 insertions, 1269 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index b9a83dd24732..2a7b38c832c7 100644
--- a/Documentation/block/biodoc.txt
+++ b/Documentation/block/biodoc.txt
@@ -963,11 +963,6 @@ elevator_dispatch_fn*		fills the dispatch queue with ready requests.
 elevator_add_req_fn*            called to add a new request into the scheduler
-elevator_queue_empty_fn         returns true if the merge queue is empty.
-                                Drivers shouldn't use this, but rather check
-                                if elv_next_request is NULL (without losing the
-                                request if one exists!)
 elevator_former_req_fn
 elevator_latter_req_fn          These return the request before or after the
                                one specified in disk sort order. Used by the
diff --git a/block/blk-core.c b/block/blk-core.c
index 6efb55cc5af0..82a45898ba76 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -198,6 +198,19 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
 }
 EXPORT_SYMBOL(blk_dump_rq_flags);
+/*
+ * Make sure that plugs that were pending when this function was entered,
+ * are now complete and requests pushed to the queue.
+*/
+static inline void queue_sync_plugs(struct request_queue *q)
+{
+        /*
+         * If the current process is plugged and has barriers submitted,
+         * we will livelock if we don't unplug first.
+         */
+        blk_flush_plug(current);
+}
 static void blk_delay_work(struct work_struct *work)
 {
        struct request_queue *q;
@@ -224,137 +237,6 @@ void blk_delay_queue(struct request_queue *q, unsigned long msecs)
 }
 EXPORT_SYMBOL(blk_delay_queue);
-/*
- * "plug" the device if there are no outstanding requests: this will
- * force the transfer to start only after we have put all the requests
- * on the list.
- *
- * This is called with interrupts off and no requests on the queue and
- * with the queue lock held.
- */
-void blk_plug_device(struct request_queue *q)
-{
-        WARN_ON(!irqs_disabled());
-        /*
-         * don't plug a stopped queue, it must be paired with blk_start_queue()
-         * which will restart the queueing
-         */
-        if (blk_queue_stopped(q))
-                return;
-        if (!queue_flag_test_and_set(QUEUE_FLAG_PLUGGED, q)) {
-                mod_timer(&q->unplug_timer, jiffies + q->unplug_delay);
-                trace_block_plug(q);
-        }
-}
-EXPORT_SYMBOL(blk_plug_device);
-/**
- * blk_plug_device_unlocked - plug a device without queue lock held
- * @q:    The &struct request_queue to plug
- *
- * Description:
- *   Like @blk_plug_device(), but grabs the queue lock and disables
- *   interrupts.
- **/
-void blk_plug_device_unlocked(struct request_queue *q)
-{
-        unsigned long flags;
-        spin_lock_irqsave(q->queue_lock, flags);
-        blk_plug_device(q);
-        spin_unlock_irqrestore(q->queue_lock, flags);
-}
-EXPORT_SYMBOL(blk_plug_device_unlocked);
-/*
- * remove the queue from the plugged list, if present. called with
- * queue lock held and interrupts disabled.
- */
-int blk_remove_plug(struct request_queue *q)
-{
-        WARN_ON(!irqs_disabled());
-        if (!queue_flag_test_and_clear(QUEUE_FLAG_PLUGGED, q))
-                return 0;
-        del_timer(&q->unplug_timer);
-        return 1;
-}
-EXPORT_SYMBOL(blk_remove_plug);
-/*
- * remove the plug and let it rip..
- */
-void __generic_unplug_device(struct request_queue *q)
-{
-        if (unlikely(blk_queue_stopped(q)))
-                return;
-        if (!blk_remove_plug(q) && !blk_queue_nonrot(q))
-                return;
-        q->request_fn(q);
-}
-/**
- * generic_unplug_device - fire a request queue
- * @q:    The &struct request_queue in question
- *
- * Description:
- *   Linux uses plugging to build bigger requests queues before letting
- *   the device have at them. If a queue is plugged, the I/O scheduler
- *   is still adding and merging requests on the queue. Once the queue
- *   gets unplugged, the request_fn defined for the queue is invoked and
- *   transfers started.
- **/
-void generic_unplug_device(struct request_queue *q)
-{
-        if (blk_queue_plugged(q)) {
-                spin_lock_irq(q->queue_lock);
-                __generic_unplug_device(q);
-                spin_unlock_irq(q->queue_lock);
-        }
-}
-EXPORT_SYMBOL(generic_unplug_device);
-static void blk_backing_dev_unplug(struct backing_dev_info *bdi,
-                                   struct page *page)
-{
-        struct request_queue *q = bdi->unplug_io_data;
-        blk_unplug(q);
-}
-void blk_unplug_work(struct work_struct *work)
-{
-        struct request_queue *q =
-                container_of(work, struct request_queue, unplug_work);
-        trace_block_unplug_io(q);
-        q->unplug_fn(q);
-}
-void blk_unplug_timeout(unsigned long data)
-{
-        struct request_queue *q = (struct request_queue *)data;
-        trace_block_unplug_timer(q);
-        kblockd_schedule_work(q, &q->unplug_work);
-}
-void blk_unplug(struct request_queue *q)
-{
-        /*
-         * devices don't necessarily have an ->unplug_fn defined
-         */
-        if (q->unplug_fn) {
-                trace_block_unplug_io(q);
-                q->unplug_fn(q);
-        }
-}
-EXPORT_SYMBOL(blk_unplug);
 /**
 * blk_start_queue - restart a previously stopped queue
 * @q:    The &struct request_queue in question
@@ -389,7 +271,6 @@ EXPORT_SYMBOL(blk_start_queue);
 **/
 void blk_stop_queue(struct request_queue *q)
 {
-        blk_remove_plug(q);
        cancel_delayed_work(&q->delay_work);
        queue_flag_set(QUEUE_FLAG_STOPPED, q);
 }
@@ -411,11 +292,10 @@ EXPORT_SYMBOL(blk_stop_queue);
 */
 void blk_sync_queue(struct request_queue *q)
 {
-        del_timer_sync(&q->unplug_timer);
        del_timer_sync(&q->timeout);
-        cancel_work_sync(&q->unplug_work);
        throtl_shutdown_timer_wq(q);
        cancel_delayed_work_sync(&q->delay_work);
+        queue_sync_plugs(q);
 }
 EXPORT_SYMBOL(blk_sync_queue);
@@ -430,14 +310,9 @@ EXPORT_SYMBOL(blk_sync_queue);
 */
 void __blk_run_queue(struct request_queue *q)
 {
-        blk_remove_plug(q);
        if (unlikely(blk_queue_stopped(q)))
                return;
-        if (elv_queue_empty(q))
-                return;
        /*
         * Only recurse once to avoid overrunning the stack, let the unplug
         * handling reinvoke the handler shortly if we already got there.
@@ -445,10 +320,8 @@ void __blk_run_queue(struct request_queue *q)
        if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
                q->request_fn(q);
                queue_flag_clear(QUEUE_FLAG_REENTER, q);
-        } else {
+        } else
-                queue_flag_set(QUEUE_FLAG_PLUGGED, q);
+                queue_delayed_work(kblockd_workqueue, &q->delay_work, 0);
-                kblockd_schedule_work(q, &q->unplug_work);
-        }
 }
 EXPORT_SYMBOL(__blk_run_queue);
@@ -535,8 +408,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
        if (!q)
                return NULL;
-        q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
-        q->backing_dev_info.unplug_io_data = q;
        q->backing_dev_info.ra_pages =
                        (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
        q->backing_dev_info.state = 0;
@@ -556,13 +427,11 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
        setup_timer(&q->backing_dev_info.laptop_mode_wb_timer,
                    laptop_mode_timer_fn, (unsigned long) q);
-        init_timer(&q->unplug_timer);
        setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q);
        INIT_LIST_HEAD(&q->timeout_list);
        INIT_LIST_HEAD(&q->flush_queue[0]);
        INIT_LIST_HEAD(&q->flush_queue[1]);
        INIT_LIST_HEAD(&q->flush_data_in_flight);
-        INIT_WORK(&q->unplug_work, blk_unplug_work);
        INIT_DELAYED_WORK(&q->delay_work, blk_delay_work);
        kobject_init(&q->kobj, &blk_queue_ktype);
@@ -652,7 +521,6 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
        q->request_fn           = rfn;
        q->prep_rq_fn           = NULL;
        q->unprep_rq_fn         = NULL;
-        q->unplug_fn            = generic_unplug_device;
        q->queue_flags          = QUEUE_FLAG_DEFAULT;
        q->queue_lock           = lock;
@@ -910,8 +778,8 @@ out:
 }
 /*
- * No available requests for this queue, unplug the device and wait for some
+ * No available requests for this queue, wait for some requests to become
- * requests to become available.
+ * available.
 *
 * Called with q->queue_lock held, and returns with it unlocked.
 */
@@ -932,7 +800,6 @@ static struct request *get_request_wait(struct request_queue *q, int rw_flags,
                trace_block_sleeprq(q, bio, rw_flags & 1);
-                __generic_unplug_device(q);
                spin_unlock_irq(q->queue_lock);
                io_schedule();
@@ -1058,7 +925,7 @@ static void add_acct_request(struct request_queue *q, struct request *rq,
                             int where)
 {
        drive_stat_acct(rq, 1);
-        __elv_add_request(q, rq, where, 0);
+        __elv_add_request(q, rq, where);
 }
 /**
@@ -2798,7 +2665,7 @@ static void flush_plug_list(struct blk_plug *plug)
                /*
                 * rq is already accounted, so use raw insert
                 */
-                __elv_add_request(q, rq, ELEVATOR_INSERT_SORT, 0);
+                __elv_add_request(q, rq, ELEVATOR_INSERT_SORT);
        }
        if (q) {
diff --git a/block/blk-exec.c b/block/blk-exec.c
index cf1456a02acd..81e31819a597 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -54,8 +54,8 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
        rq->end_io = done;
        WARN_ON(irqs_disabled());
        spin_lock_irq(q->queue_lock);
-        __elv_add_request(q, rq, where, 1);
+        __elv_add_request(q, rq, where);
-        __generic_unplug_device(q);
+        __blk_run_queue(q);
        /* the queue is stopped so it won't be plugged+unplugged */
        if (rq->cmd_type == REQ_TYPE_PM_RESUME)
                q->request_fn(q);
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 1e2aa8a8908c..671fa9da7560 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -194,7 +194,6 @@ static void flush_end_io(struct request *flush_rq, int error)
 {
        struct request_queue *q = flush_rq->q;
        struct list_head *running = &q->flush_queue[q->flush_running_idx];
-        bool was_empty = elv_queue_empty(q);
        bool queued = false;
        struct request *rq, *n;
@@ -213,7 +212,7 @@ static void flush_end_io(struct request *flush_rq, int error)
        }
        /* after populating an empty queue, kick it to avoid stall */
-        if (queued && was_empty)
+        if (queued)
                __blk_run_queue(q);
 }
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 36c8c1f2af18..c8d68921dddb 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -164,14 +164,6 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn)
        blk_queue_congestion_threshold(q);
        q->nr_batching = BLK_BATCH_REQ;
-        q->unplug_thresh = 4;           /* hmm */
-        q->unplug_delay = msecs_to_jiffies(3);  /* 3 milliseconds */
-        if (q->unplug_delay == 0)
-                q->unplug_delay = 1;
-        q->unplug_timer.function = blk_unplug_timeout;
-        q->unplug_timer.data = (unsigned long)q;
        blk_set_default_limits(&q->limits);
        blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS);
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a89043a3caa4..b8dcdc2663a1 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -800,7 +800,6 @@ out:
        if (nr_disp) {
                while((bio = bio_list_pop(&bio_list_on_stack)))
                        generic_make_request(bio);
-                blk_unplug(q);
        }
        return nr_disp;
 }
diff --git a/block/blk.h b/block/blk.h
index 284b500852bd..49d21af81d07 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -18,8 +18,6 @@ int blk_rq_append_bio(struct request_queue *q, struct request *rq,
 void blk_dequeue_request(struct request *rq);
 void __blk_queue_free_tags(struct request_queue *q);
-void blk_unplug_work(struct work_struct *work);
-void blk_unplug_timeout(unsigned long data);
 void blk_rq_timed_out_timer(unsigned long data);
 void blk_delete_timer(struct request *);
 void blk_add_timer(struct request *);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 3202c7e87fb3..ef631539dd2a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -499,13 +499,6 @@ static inline void cfq_schedule_dispatch(struct cfq_data *cfqd)
        }
 }
-static int cfq_queue_empty(struct request_queue *q)
-{
-        struct cfq_data *cfqd = q->elevator->elevator_data;
-        return !cfqd->rq_queued;
-}
 /*
 * Scale schedule slice based on io priority. Use the sync time slice only
 * if a queue is marked sync and has sync io queued. A sync queue with async
@@ -4061,7 +4054,6 @@ static struct elevator_type iosched_cfq = {
                .elevator_add_req_fn =          cfq_insert_request,
                .elevator_activate_req_fn =     cfq_activate_request,
                .elevator_deactivate_req_fn =   cfq_deactivate_request,
-                .elevator_queue_empty_fn =      cfq_queue_empty,
                .elevator_completed_req_fn =    cfq_completed_request,
                .elevator_former_req_fn =       elv_rb_former_request,
                .elevator_latter_req_fn =       elv_rb_latter_request,
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index b547cbca7b23..5139c0ea1864 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -326,14 +326,6 @@ dispatch_request:
        return 1;
 }
-static int deadline_queue_empty(struct request_queue *q)
-{
-        struct deadline_data *dd = q->elevator->elevator_data;
-        return list_empty(&dd->fifo_list[WRITE])
-                && list_empty(&dd->fifo_list[READ]);
-}
 static void deadline_exit_queue(struct elevator_queue *e)
 {
        struct deadline_data *dd = e->elevator_data;
@@ -445,7 +437,6 @@ static struct elevator_type iosched_deadline = {
                .elevator_merge_req_fn =        deadline_merged_requests,
                .elevator_dispatch_fn =         deadline_dispatch_requests,
                .elevator_add_req_fn =          deadline_add_request,
-                .elevator_queue_empty_fn =      deadline_queue_empty,
                .elevator_former_req_fn =       elv_rb_former_request,
                .elevator_latter_req_fn =       elv_rb_latter_request,
                .elevator_init_fn =             deadline_init_queue,
diff --git a/block/elevator.c b/block/elevator.c
index 25713927c0d3..3ea208256e78 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -619,21 +619,12 @@ void elv_quiesce_end(struct request_queue *q)
 void elv_insert(struct request_queue *q, struct request *rq, int where)
 {
-        int unplug_it = 1;
        trace_block_rq_insert(q, rq);
        rq->q = q;
        switch (where) {
        case ELEVATOR_INSERT_REQUEUE:
-                /*
-                 * Most requeues happen because of a busy condition,
-                 * don't force unplug of the queue for that case.
-                 * Clear unplug_it and fall through.
-                 */
-                unplug_it = 0;
        case ELEVATOR_INSERT_FRONT:
                rq->cmd_flags |= REQ_SOFTBARRIER;
                list_add(&rq->queuelist, &q->queue_head);
@@ -679,24 +670,14 @@ void elv_insert(struct request_queue *q, struct request *rq, int where)
                rq->cmd_flags |= REQ_SOFTBARRIER;
                blk_insert_flush(rq);
                break;
        default:
                printk(KERN_ERR "%s: bad insertion point %d\n",
                       __func__, where);
                BUG();
        }
-        if (unplug_it && blk_queue_plugged(q)) {
-                int nrq = q->rq.count[BLK_RW_SYNC] + q->rq.count[BLK_RW_ASYNC]
-                                - queue_in_flight(q);
-                if (nrq >= q->unplug_thresh)
-                        __generic_unplug_device(q);
-        }
 }
-void __elv_add_request(struct request_queue *q, struct request *rq, int where,
+void __elv_add_request(struct request_queue *q, struct request *rq, int where)
-                       int plug)
 {
        BUG_ON(rq->cmd_flags & REQ_ON_PLUG);
@@ -711,38 +692,20 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where,
                    where == ELEVATOR_INSERT_SORT)
                where = ELEVATOR_INSERT_BACK;
-        if (plug)
-                blk_plug_device(q);
        elv_insert(q, rq, where);
 }
 EXPORT_SYMBOL(__elv_add_request);
-void elv_add_request(struct request_queue *q, struct request *rq, int where,
+void elv_add_request(struct request_queue *q, struct request *rq, int where)
-                     int plug)
 {
        unsigned long flags;
        spin_lock_irqsave(q->queue_lock, flags);
-        __elv_add_request(q, rq, where, plug);
+        __elv_add_request(q, rq, where);
        spin_unlock_irqrestore(q->queue_lock, flags);
 }
 EXPORT_SYMBOL(elv_add_request);
-int elv_queue_empty(struct request_queue *q)
-{
-        struct elevator_queue *e = q->elevator;
-        if (!list_empty(&q->queue_head))
-                return 0;
-        if (e->ops->elevator_queue_empty_fn)
-                return e->ops->elevator_queue_empty_fn(q);
-        return 1;
-}
-EXPORT_SYMBOL(elv_queue_empty);
 struct request *elv_latter_request(struct request_queue *q, struct request *rq)
 {
        struct elevator_queue *e = q->elevator;
diff --git a/block/noop-iosched.c b/block/noop-iosched.c
index 232c4b38cd37..06389e9ef96d 100644
--- a/block/noop-iosched.c
+++ b/block/noop-iosched.c
@@ -39,13 +39,6 @@ static void noop_add_request(struct request_queue *q, struct request *rq)
        list_add_tail(&rq->queuelist, &nd->queue);
 }
-static int noop_queue_empty(struct request_queue *q)
-{
-        struct noop_data *nd = q->elevator->elevator_data;
-        return list_empty(&nd->queue);
-}
 static struct request *
 noop_former_request(struct request_queue *q, struct request *rq)
 {
@@ -90,7 +83,6 @@ static struct elevator_type elevator_noop = {
                .elevator_merge_req_fn          = noop_merged_requests,
                .elevator_dispatch_fn           = noop_dispatch,
                .elevator_add_req_fn            = noop_add_request,
-                .elevator_queue_empty_fn        = noop_queue_empty,
                .elevator_former_req_fn         = noop_former_request,
                .elevator_latter_req_fn         = noop_latter_request,
                .elevator_init_fn               = noop_init_queue,
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 9279272b3732..35658f445fca 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3170,12 +3170,6 @@ static void do_cciss_request(struct request_queue *q)
        int sg_index = 0;
        int chained = 0;
-        /* We call start_io here in case there is a command waiting on the
-         * queue that has not been sent.
-         */
-        if (blk_queue_plugged(q))
-                goto startio;
      queue:
        creq = blk_peek_request(q);
        if (!creq)
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 946dad4caef3..b2fceb53e809 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -911,9 +911,6 @@ static void do_ida_request(struct request_queue *q)
        struct scatterlist tmp_sg[SG_MAX];
        int i, dir, seg;
-        if (blk_queue_plugged(q))
-                goto startio;
 queue_next:
        creq = blk_peek_request(q);
        if (!creq)
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index ba95cba192be..2096628d6e65 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -689,8 +689,6 @@ void drbd_al_to_on_disk_bm(struct drbd_conf *mdev)
                }
        }
-        drbd_blk_run_queue(bdev_get_queue(mdev->ldev->md_bdev));
        /* always (try to) flush bitmap to stable storage */
        drbd_md_flush(mdev);
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index fd42832f785b..0645ca829a94 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -840,7 +840,6 @@ static int bm_rw(struct drbd_conf *mdev, int rw) __must_hold(local)
        for (i = 0; i < num_pages; i++)
                bm_page_io_async(mdev, b, i, rw);
-        drbd_blk_run_queue(bdev_get_queue(mdev->ldev->md_bdev));
        wait_event(b->bm_io_wait, atomic_read(&b->bm_async_io) == 0);
        if (test_bit(BM_MD_IO_ERROR, &b->bm_flags)) {
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 3803a0348937..0b5718e19586 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -2382,20 +2382,6 @@ static inline int drbd_queue_order_type(struct drbd_conf *mdev)
        return QUEUE_ORDERED_NONE;
 }
-static inline void drbd_blk_run_queue(struct request_queue *q)
-{
-        if (q && q->unplug_fn)
-                q->unplug_fn(q);
-}
-static inline void drbd_kick_lo(struct drbd_conf *mdev)
-{
-        if (get_ldev(mdev)) {
-                drbd_blk_run_queue(bdev_get_queue(mdev->ldev->backing_bdev));
-                put_ldev(mdev);
-        }
-}
 static inline void drbd_md_flush(struct drbd_conf *mdev)
 {
        int r;
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 29cd0dc9fe4f..6049cb85310d 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2719,35 +2719,6 @@ static int drbd_release(struct gendisk *gd, fmode_t mode)
        return 0;
 }
-static void drbd_unplug_fn(struct request_queue *q)
-{
-        struct drbd_conf *mdev = q->queuedata;
-        /* unplug FIRST */
-        spin_lock_irq(q->queue_lock);
-        blk_remove_plug(q);
-        spin_unlock_irq(q->queue_lock);
-        /* only if connected */
-        spin_lock_irq(&mdev->req_lock);
-        if (mdev->state.pdsk >= D_INCONSISTENT && mdev->state.conn >= C_CONNECTED) {
-                D_ASSERT(mdev->state.role == R_PRIMARY);
-                if (test_and_clear_bit(UNPLUG_REMOTE, &mdev->flags)) {
-                        /* add to the data.work queue,
-                         * unless already queued.
-                         * XXX this might be a good addition to drbd_queue_work
-                         * anyways, to detect "double queuing" ... */
-                        if (list_empty(&mdev->unplug_work.list))
-                                drbd_queue_work(&mdev->data.work,
-                                                &mdev->unplug_work);
-                }
-        }
-        spin_unlock_irq(&mdev->req_lock);
-        if (mdev->state.disk >= D_INCONSISTENT)
-                drbd_kick_lo(mdev);
-}
 static void drbd_set_defaults(struct drbd_conf *mdev)
 {
        /* This way we get a compile error when sync_conf grows,
@@ -3222,9 +3193,7 @@ struct drbd_conf *drbd_new_device(unsigned int minor)
        blk_queue_max_segment_size(q, DRBD_MAX_SEGMENT_SIZE);
        blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
        blk_queue_merge_bvec(q, drbd_merge_bvec);
-        q->queue_lock = &mdev->req_lock; /* needed since we use */
+        q->queue_lock = &mdev->req_lock;
-                /* plugging on a queue, that actually has no requests! */
-        q->unplug_fn = drbd_unplug_fn;
        mdev->md_io_page = alloc_page(GFP_KERNEL);
        if (!mdev->md_io_page)
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 24487d4fb202..84132f8bf8a4 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -187,15 +187,6 @@ static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int
        return NULL;
 }
-/* kick lower level device, if we have more than (arbitrary number)
- * reference counts on it, which typically are locally submitted io
- * requests.  don't use unacked_cnt, so we speed up proto A and B, too. */
-static void maybe_kick_lo(struct drbd_conf *mdev)
-{
-        if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark)
-                drbd_kick_lo(mdev);
-}
 static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed)
 {
        struct drbd_epoch_entry *e;
@@ -219,7 +210,6 @@ static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev)
        LIST_HEAD(reclaimed);
        struct drbd_epoch_entry *e, *t;
-        maybe_kick_lo(mdev);
        spin_lock_irq(&mdev->req_lock);
        reclaim_net_ee(mdev, &reclaimed);
        spin_unlock_irq(&mdev->req_lock);
@@ -436,8 +426,7 @@ void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
        while (!list_empty(head)) {
                prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
                spin_unlock_irq(&mdev->req_lock);
-                drbd_kick_lo(mdev);
+                io_schedule();
-                schedule();
                finish_wait(&mdev->ee_wait, &wait);
                spin_lock_irq(&mdev->req_lock);
        }
@@ -1147,7 +1136,6 @@ next_bio:
                drbd_generic_make_request(mdev, fault_type, bio);
        } while (bios);
-        maybe_kick_lo(mdev);
        return 0;
 fail:
@@ -1167,9 +1155,6 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsign
        inc_unacked(mdev);
-        if (mdev->net_conf->wire_protocol != DRBD_PROT_C)
-                drbd_kick_lo(mdev);
        mdev->current_epoch->barrier_nr = p->barrier;
        rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR);
@@ -3556,9 +3541,6 @@ static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
 static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
 {
-        if (mdev->state.disk >= D_INCONSISTENT)
-                drbd_kick_lo(mdev);
        /* Make sure we've acked all the TCP data associated
         * with the data requests being unplugged */
        drbd_tcp_quickack(mdev->data.socket);
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 11a75d32a2e2..ad3fc6228f27 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -960,10 +960,6 @@ allocate_barrier:
                        bio_endio(req->private_bio, -EIO);
        }
-        /* we need to plug ALWAYS since we possibly need to kick lo_dev.
-         * we plug after submit, so we won't miss an unplug event */
-        drbd_plug_device(mdev);
        return 0;
 fail_conflicting:
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 34f224b018b3..e027446590d3 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -792,7 +792,6 @@ int drbd_resync_finished(struct drbd_conf *mdev)
                 * queue (or even the read operations for those packets
                 * is not finished by now).   Retry in 100ms. */
-                drbd_kick_lo(mdev);
                __set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(HZ / 10);
                w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC);
diff --git a/drivers/block/drbd/drbd_wrappers.h b/drivers/block/drbd/drbd_wrappers.h
index defdb5013ea3..53586fa5ae1b 100644
--- a/drivers/block/drbd/drbd_wrappers.h
+++ b/drivers/block/drbd/drbd_wrappers.h
@@ -45,24 +45,6 @@ static inline void drbd_generic_make_request(struct drbd_conf *mdev,
                generic_make_request(bio);
 }
-static inline void drbd_plug_device(struct drbd_conf *mdev)
-{
-        struct request_queue *q;
-        q = bdev_get_queue(mdev->this_bdev);
-        spin_lock_irq(q->queue_lock);
-/* XXX the check on !blk_queue_plugged is redundant,
- * implicitly checked in blk_plug_device */
-        if (!blk_queue_plugged(q)) {
-                blk_plug_device(q);
-                del_timer(&q->unplug_timer);
-                /* unplugging should not happen automatically... */
-        }
-        spin_unlock_irq(q->queue_lock);
-}
 static inline int drbd_crypto_is_hash(struct crypto_tfm *tfm)
 {
        return (crypto_tfm_alg_type(tfm) & CRYPTO_ALG_TYPE_HASH_MASK)
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index b9ba04fc2b34..271142b9e2cd 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3837,7 +3837,6 @@ static int __floppy_read_block_0(struct block_device *bdev)
        bio.bi_end_io = floppy_rb0_complete;
        submit_bio(READ, &bio);
-        generic_unplug_device(bdev_get_queue(bdev));
        process_fd_request();
        wait_for_completion(&complete);
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 49e6a545eb63..01b8e4a87c9f 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -541,17 +541,6 @@ out:
        return 0;
 }
-/*
- * kick off io on the underlying address space
- */
-static void loop_unplug(struct request_queue *q)
-{
-        struct loop_device *lo = q->queuedata;
-        queue_flag_clear_unlocked(QUEUE_FLAG_PLUGGED, q);
-        blk_run_address_space(lo->lo_backing_file->f_mapping);
-}
 struct switch_request {
        struct file *file;
        struct completion wait;
@@ -918,7 +907,6 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
         */
        blk_queue_make_request(lo->lo_queue, loop_make_request);
        lo->lo_queue->queuedata = lo;
-        lo->lo_queue->unplug_fn = loop_unplug;
        if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync)
                blk_queue_flush(lo->lo_queue, REQ_FLUSH);
@@ -1020,7 +1008,6 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
        kthread_stop(lo->lo_thread);
-        lo->lo_queue->unplug_fn = NULL;
        lo->lo_backing_file = NULL;
        loop_release_xfer(lo);
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 77d70eebb6b2..d20e13f80001 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1606,8 +1606,6 @@ static int kcdrwd(void *foobar)
                                        min_sleep_time = pkt->sleep_time;
                        }
-                        generic_unplug_device(bdev_get_queue(pd->bdev));
                        VPRINTK("kcdrwd: sleeping\n");
                        residue = schedule_timeout(min_sleep_time);
                        VPRINTK("kcdrwd: wake up\n");
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index 8be57151f5d6..653439faa729 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -241,8 +241,7 @@ static void dump_dmastat(struct cardinfo *card, unsigned int dmastat)
 *
 * Whenever IO on the active page completes, the Ready page is activated
 * and the ex-Active page is clean out and made Ready.
- * Otherwise the Ready page is only activated when it becomes full, or
+ * Otherwise the Ready page is only activated when it becomes full.
- * when mm_unplug_device is called via the unplug_io_fn.
 *
 * If a request arrives while both pages a full, it is queued, and b_rdev is
 * overloaded to record whether it was a read or a write.
@@ -333,17 +332,6 @@ static inline void reset_page(struct mm_page *page)
        page->biotail = &page->bio;
 }
-static void mm_unplug_device(struct request_queue *q)
-{
-        struct cardinfo *card = q->queuedata;
-        unsigned long flags;
-        spin_lock_irqsave(&card->lock, flags);
-        if (blk_remove_plug(q))
-                activate(card);
-        spin_unlock_irqrestore(&card->lock, flags);
-}
 /*
 * If there is room on Ready page, take
 * one bh off list and add it.
@@ -535,7 +523,6 @@ static int mm_make_request(struct request_queue *q, struct bio *bio)
        *card->biotail = bio;
        bio->bi_next = NULL;
        card->biotail = &bio->bi_next;
-        blk_plug_device(q);
        spin_unlock_irq(&card->lock);
        return 0;
@@ -907,7 +894,6 @@ static int __devinit mm_pci_probe(struct pci_dev *dev,
        blk_queue_make_request(card->queue, mm_make_request);
        card->queue->queue_lock = &card->lock;
        card->queue->queuedata = card;
-        card->queue->unplug_fn = mm_unplug_device;
        tasklet_init(&card->tasklet, process_page, (unsigned long)card);
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e88a2cf17711..6f218e014e99 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -233,8 +233,7 @@ int ide_queue_sense_rq(ide_drive_t *drive, void *special)
        drive->hwif->rq = NULL;
-        elv_add_request(drive->queue, &drive->sense_rq,
+        elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);
-                        ELEVATOR_INSERT_FRONT, 0);
        return 0;
 }
 EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 999dac054bcc..f4077840d3ab 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -549,8 +549,6 @@ plug_device_2:
        if (rq)
                blk_requeue_request(q, rq);
-        if (!elv_queue_empty(q))
-                blk_plug_device(q);
 }
 void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq)
@@ -562,8 +560,6 @@ void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq)
        if (rq)
                blk_requeue_request(q, rq);
-        if (!elv_queue_empty(q))
-                blk_plug_device(q);
        spin_unlock_irqrestore(q->queue_lock, flags);
 }
diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c
index 88a380c5a470..6ab9ab2a5081 100644
--- a/drivers/ide/ide-park.c
+++ b/drivers/ide/ide-park.c
@@ -52,7 +52,7 @@ static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
        rq->cmd[0] = REQ_UNPARK_HEADS;
        rq->cmd_len = 1;
        rq->cmd_type = REQ_TYPE_SPECIAL;
-        elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
+        elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
 out:
        return;
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 9a35320fb59f..54bfc274b39a 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1339,8 +1339,7 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
                        prepare_to_wait(&bitmap->overflow_wait, &__wait,
                                        TASK_UNINTERRUPTIBLE);
                        spin_unlock_irq(&bitmap->lock);
-                        md_unplug(bitmap->mddev);
+                        io_schedule();
-                        schedule();
                        finish_wait(&bitmap->overflow_wait, &__wait);
                        continue;
                }
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 4e054bd91664..2c62c1169f78 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -991,11 +991,6 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
        clone->bi_destructor = dm_crypt_bio_destructor;
 }
-static void kcryptd_unplug(struct crypt_config *cc)
-{
-        blk_unplug(bdev_get_queue(cc->dev->bdev));
-}
 static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
 {
        struct crypt_config *cc = io->target->private;
@@ -1008,10 +1003,8 @@ static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
         * one in order to decrypt the whole bio data *afterwards*.
         */
        clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs);
-        if (!clone) {
+        if (!clone)
-                kcryptd_unplug(cc);
                return 1;
-        }
        crypt_inc_pending(io);
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 924f5f0084c2..400cf35094a4 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -37,13 +37,6 @@ struct dm_kcopyd_client {
        unsigned int nr_pages;
        unsigned int nr_free_pages;
-        /*
-         * Block devices to unplug.
-         * Non-NULL pointer means that a block device has some pending requests
-         * and needs to be unplugged.
-         */
-        struct block_device *unplug[2];
        struct dm_io_client *io_client;
        wait_queue_head_t destroyq;
@@ -315,31 +308,6 @@ static int run_complete_job(struct kcopyd_job *job)
        return 0;
 }
-/*
- * Unplug the block device at the specified index.
- */
-static void unplug(struct dm_kcopyd_client *kc, int rw)
-{
-        if (kc->unplug[rw] != NULL) {
-                blk_unplug(bdev_get_queue(kc->unplug[rw]));
-                kc->unplug[rw] = NULL;
-        }
-}
-/*
- * Prepare block device unplug. If there's another device
- * to be unplugged at the same array index, we unplug that
- * device first.
- */
-static void prepare_unplug(struct dm_kcopyd_client *kc, int rw,
-                           struct block_device *bdev)
-{
-        if (likely(kc->unplug[rw] == bdev))
-                return;
-        unplug(kc, rw);
-        kc->unplug[rw] = bdev;
-}
 static void complete_io(unsigned long error, void *context)
 {
        struct kcopyd_job *job = (struct kcopyd_job *) context;
@@ -386,15 +354,12 @@ static int run_io_job(struct kcopyd_job *job)
                .client = job->kc->io_client,
        };
-        if (job->rw == READ) {
+        if (job->rw == READ)
                r = dm_io(&io_req, 1, &job->source, NULL);
-                prepare_unplug(job->kc, READ, job->source.bdev);
+        else {
-        } else {
                if (job->num_dests > 1)
                        io_req.bi_rw |= REQ_UNPLUG;
                r = dm_io(&io_req, job->num_dests, job->dests, NULL);
-                if (!(io_req.bi_rw & REQ_UNPLUG))
-                        prepare_unplug(job->kc, WRITE, job->dests[0].bdev);
        }
        return r;
@@ -466,6 +431,7 @@ static void do_work(struct work_struct *work)
 {
        struct dm_kcopyd_client *kc = container_of(work,
                                        struct dm_kcopyd_client, kcopyd_work);
+        struct blk_plug plug;
        /*
         * The order that these are called is *very* important.
@@ -473,18 +439,12 @@ static void do_work(struct work_struct *work)
         * Pages jobs when successful will jump onto the io jobs
         * list.  io jobs call wake when they complete and it all
         * starts again.
-         *
-         * Note that io_jobs add block devices to the unplug array,
-         * this array is cleared with "unplug" calls. It is thus
-         * forbidden to run complete_jobs after io_jobs and before
-         * unplug because the block device could be destroyed in
-         * job completion callback.
         */
+        blk_start_plug(&plug);
        process_jobs(&kc->complete_jobs, kc, run_complete_job);
        process_jobs(&kc->pages_jobs, kc, run_pages_job);
        process_jobs(&kc->io_jobs, kc, run_io_job);
-        unplug(kc, READ);
+        blk_finish_plug(&plug);
-        unplug(kc, WRITE);
 }
 /*
@@ -665,8 +625,6 @@ int dm_kcopyd_client_create(unsigned int nr_pages,
        INIT_LIST_HEAD(&kc->io_jobs);
        INIT_LIST_HEAD(&kc->pages_jobs);
-        memset(kc->unplug, 0, sizeof(kc->unplug));
        kc->job_pool = mempool_create_slab_pool(MIN_JOBS, _job_cache);
        if (!kc->job_pool)
                goto bad_slab;
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index b9e1e15ef11c..5ef136cdba91 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -394,7 +394,7 @@ static void raid_unplug(struct dm_target_callbacks *cb)
 {
        struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
-        md_raid5_unplug_device(rs->md.private);
+        md_raid5_kick_device(rs->md.private);
 }
 /*
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index dee326775c60..976ad4688afc 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -842,8 +842,6 @@ static void do_mirror(struct work_struct *work)
        do_reads(ms, &reads);
        do_writes(ms, &writes);
        do_failures(ms, &failures);
-        dm_table_unplug_all(ms->ti->table);
 }
 /*-----------------------------------------------------------------
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 38e4eb1bb965..f50a7b952257 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1275,29 +1275,6 @@ int dm_table_any_busy_target(struct dm_table *t)
        return 0;
 }
-void dm_table_unplug_all(struct dm_table *t)
-{
-        struct dm_dev_internal *dd;
-        struct list_head *devices = dm_table_get_devices(t);
-        struct dm_target_callbacks *cb;
-        list_for_each_entry(dd, devices, list) {
-                struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev);
-                char b[BDEVNAME_SIZE];
-                if (likely(q))
-                        blk_unplug(q);
-                else
-                        DMWARN_LIMIT("%s: Cannot unplug nonexistent device %s",
-                                     dm_device_name(t->md),
-                                     bdevname(dd->dm_dev.bdev, b));
-        }
-        list_for_each_entry(cb, &t->target_callbacks, list)
-                if (cb->unplug_fn)
-                        cb->unplug_fn(cb);
-}
 struct mapped_device *dm_table_get_md(struct dm_table *t)
 {
        return t->md;
@@ -1345,4 +1322,3 @@ EXPORT_SYMBOL(dm_table_get_mode);
 EXPORT_SYMBOL(dm_table_get_md);
 EXPORT_SYMBOL(dm_table_put);
 EXPORT_SYMBOL(dm_table_get);
-EXPORT_SYMBOL(dm_table_unplug_all);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index eaa3af0e0632..d22b9905c168 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -807,8 +807,6 @@ void dm_requeue_unmapped_request(struct request *clone)
        dm_unprep_request(rq);
        spin_lock_irqsave(q->queue_lock, flags);
-        if (elv_queue_empty(q))
-                blk_plug_device(q);
        blk_requeue_request(q, rq);
        spin_unlock_irqrestore(q->queue_lock, flags);
@@ -1613,10 +1611,10 @@ static void dm_request_fn(struct request_queue *q)
         * number of in-flight I/Os after the queue is stopped in
         * dm_suspend().
         */
-        while (!blk_queue_plugged(q) && !blk_queue_stopped(q)) {
+        while (!blk_queue_stopped(q)) {
                rq = blk_peek_request(q);
                if (!rq)
-                        goto plug_and_out;
+                        goto delay_and_out;
                /* always use block 0 to find the target for flushes for now */
                pos = 0;
@@ -1627,7 +1625,7 @@ static void dm_request_fn(struct request_queue *q)
                BUG_ON(!dm_target_is_valid(ti));
                if (ti->type->busy && ti->type->busy(ti))
-                        goto plug_and_out;
+                        goto delay_and_out;
                blk_start_request(rq);
                clone = rq->special;
@@ -1647,11 +1645,8 @@ requeued:
        BUG_ON(!irqs_disabled());
        spin_lock(q->queue_lock);
-plug_and_out:
+delay_and_out:
-        if (!elv_queue_empty(q))
+        blk_delay_queue(q, HZ / 10);
-                /* Some requests still remain, retry later */
-                blk_plug_device(q);
 out:
        dm_table_put(map);
@@ -1680,20 +1675,6 @@ static int dm_lld_busy(struct request_queue *q)
        return r;
 }
-static void dm_unplug_all(struct request_queue *q)
-{
-        struct mapped_device *md = q->queuedata;
-        struct dm_table *map = dm_get_live_table(md);
-        if (map) {
-                if (dm_request_based(md))
-                        generic_unplug_device(q);
-                dm_table_unplug_all(map);
-                dm_table_put(map);
-        }
-}
 static int dm_any_congested(void *congested_data, int bdi_bits)
 {
        int r = bdi_bits;
@@ -1817,7 +1798,6 @@ static void dm_init_md_queue(struct mapped_device *md)
        md->queue->backing_dev_info.congested_data = md;
        blk_queue_make_request(md->queue, dm_request);
        blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
-        md->queue->unplug_fn = dm_unplug_all;
        blk_queue_merge_bvec(md->queue, dm_merge_bvec);
        blk_queue_flush(md->queue, REQ_FLUSH | REQ_FUA);
 }
@@ -2263,8 +2243,6 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
        int r = 0;
        DECLARE_WAITQUEUE(wait, current);
-        dm_unplug_all(md->queue);
        add_wait_queue(&md->wait, &wait);
        while (1) {
@@ -2539,7 +2517,6 @@ int dm_resume(struct mapped_device *md)
        clear_bit(DMF_SUSPENDED, &md->flags);
-        dm_table_unplug_all(map);
        r = 0;
 out:
        dm_table_put(map);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 8a2f767f26d8..38861b5b9d90 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -87,22 +87,6 @@ static int linear_mergeable_bvec(struct request_queue *q,
        return maxsectors << 9;
 }
-static void linear_unplug(struct request_queue *q)
-{
-        mddev_t *mddev = q->queuedata;
-        linear_conf_t *conf;
-        int i;
-        rcu_read_lock();
-        conf = rcu_dereference(mddev->private);
-        for (i=0; i < mddev->raid_disks; i++) {
-                struct request_queue *r_queue = bdev_get_queue(conf->disks[i].rdev->bdev);
-                blk_unplug(r_queue);
-        }
-        rcu_read_unlock();
-}
 static int linear_congested(void *data, int bits)
 {
        mddev_t *mddev = data;
@@ -225,7 +209,6 @@ static int linear_run (mddev_t *mddev)
        md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
        blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
-        mddev->queue->unplug_fn = linear_unplug;
        mddev->queue->backing_dev_info.congested_fn = linear_congested;
        mddev->queue->backing_dev_info.congested_data = mddev;
        md_integrity_register(mddev);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0cc30ecda4c1..ca0d79c264b9 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4812,7 +4812,6 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
                __md_stop_writes(mddev);
                md_stop(mddev);
                mddev->queue->merge_bvec_fn = NULL;
-                mddev->queue->unplug_fn = NULL;
                mddev->queue->backing_dev_info.congested_fn = NULL;
                /* tell userspace to handle 'inactive' */
@@ -6669,8 +6668,6 @@ EXPORT_SYMBOL_GPL(md_allow_write);
 void md_unplug(mddev_t *mddev)
 {
-        if (mddev->queue)
-                blk_unplug(mddev->queue);
        if (mddev->plug)
                mddev->plug->unplug_fn(mddev->plug);
 }
@@ -6853,7 +6850,6 @@ void md_do_sync(mddev_t *mddev)
                     >= mddev->resync_max - mddev->curr_resync_completed
                            )) {
                        /* time to update curr_resync_completed */
-                        md_unplug(mddev);
                        wait_event(mddev->recovery_wait,
                                   atomic_read(&mddev->recovery_active) == 0);
                        mddev->curr_resync_completed = j;
@@ -6929,7 +6925,6 @@ void md_do_sync(mddev_t *mddev)
                 * about not overloading the IO subsystem. (things like an
                 * e2fsck being done on the RAID array should execute fast)
                 */
-                md_unplug(mddev);
                cond_resched();
                currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
@@ -6948,8 +6943,6 @@ void md_do_sync(mddev_t *mddev)
         * this also signals 'finished resyncing' to md_stop
         */
 out:
-        md_unplug(mddev);
        wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
        /* tell personality that we are finished */
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 6d7ddf32ef2e..1cc8ed44e4ad 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -106,36 +106,6 @@ static void multipath_end_request(struct bio *bio, int error)
        rdev_dec_pending(rdev, conf->mddev);
 }
-static void unplug_slaves(mddev_t *mddev)
-{
-        multipath_conf_t *conf = mddev->private;
-        int i;
-        rcu_read_lock();
-        for (i=0; i<mddev->raid_disks; i++) {
-                mdk_rdev_t *rdev = rcu_dereference(conf->multipaths[i].rdev);
-                if (rdev && !test_bit(Faulty, &rdev->flags)
-                    && atomic_read(&rdev->nr_pending)) {
-                        struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
-                        atomic_inc(&rdev->nr_pending);
-                        rcu_read_unlock();
-                        blk_unplug(r_queue);
-                        rdev_dec_pending(rdev, mddev);
-                        rcu_read_lock();
-                }
-        }
-        rcu_read_unlock();
-}
-static void multipath_unplug(struct request_queue *q)
-{
-        unplug_slaves(q->queuedata);
-}
 static int multipath_make_request(mddev_t *mddev, struct bio * bio)
 {
        multipath_conf_t *conf = mddev->private;
@@ -518,7 +488,6 @@ static int multipath_run (mddev_t *mddev)
         */
        md_set_array_sectors(mddev, multipath_size(mddev, 0, 0));
-        mddev->queue->unplug_fn = multipath_unplug;
        mddev->queue->backing_dev_info.congested_fn = multipath_congested;
        mddev->queue->backing_dev_info.congested_data = mddev;
        md_integrity_register(mddev);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 637a96855edb..6338c0fe6208 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -25,21 +25,6 @@
 #include "raid0.h"
 #include "raid5.h"
-static void raid0_unplug(struct request_queue *q)
-{
-        mddev_t *mddev = q->queuedata;
-        raid0_conf_t *conf = mddev->private;
-        mdk_rdev_t **devlist = conf->devlist;
-        int raid_disks = conf->strip_zone[0].nb_dev;
-        int i;
-        for (i=0; i < raid_disks; i++) {
-                struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev);
-                blk_unplug(r_queue);
-        }
-}
 static int raid0_congested(void *data, int bits)
 {
        mddev_t *mddev = data;
@@ -272,7 +257,6 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf)
                       mdname(mddev),
                       (unsigned long long)smallest->sectors);
        }
-        mddev->queue->unplug_fn = raid0_unplug;
        mddev->queue->backing_dev_info.congested_fn = raid0_congested;
        mddev->queue->backing_dev_info.congested_data = mddev;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a23ffa397ba9..b67d822d57ae 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -52,23 +52,16 @@
 #define NR_RAID1_BIOS 256
-static void unplug_slaves(mddev_t *mddev);
 static void allow_barrier(conf_t *conf);
 static void lower_barrier(conf_t *conf);
 static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data)
 {
        struct pool_info *pi = data;
-        r1bio_t *r1_bio;
        int size = offsetof(r1bio_t, bios[pi->raid_disks]);
        /* allocate a r1bio with room for raid_disks entries in the bios array */
-        r1_bio = kzalloc(size, gfp_flags);
+        return kzalloc(size, gfp_flags);
-        if (!r1_bio && pi->mddev)
-                unplug_slaves(pi->mddev);
-        return r1_bio;
 }
 static void r1bio_pool_free(void *r1_bio, void *data)
@@ -91,10 +84,8 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
        int i, j;
        r1_bio = r1bio_pool_alloc(gfp_flags, pi);
-        if (!r1_bio) {
+        if (!r1_bio)
-                unplug_slaves(pi->mddev);
                return NULL;
-        }
        /*
         * Allocate bios : 1 for reading, n-1 for writing
@@ -520,37 +511,6 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
        return new_disk;
 }
-static void unplug_slaves(mddev_t *mddev)
-{
-        conf_t *conf = mddev->private;
-        int i;
-        rcu_read_lock();
-        for (i=0; i<mddev->raid_disks; i++) {
-                mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
-                if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
-                        struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
-                        atomic_inc(&rdev->nr_pending);
-                        rcu_read_unlock();
-                        blk_unplug(r_queue);
-                        rdev_dec_pending(rdev, mddev);
-                        rcu_read_lock();
-                }
-        }
-        rcu_read_unlock();
-}
-static void raid1_unplug(struct request_queue *q)
-{
-        mddev_t *mddev = q->queuedata;
-        unplug_slaves(mddev);
-        md_wakeup_thread(mddev->thread);
-}
 static int raid1_congested(void *data, int bits)
 {
        mddev_t *mddev = data;
@@ -580,20 +540,16 @@ static int raid1_congested(void *data, int bits)
 }
-static int flush_pending_writes(conf_t *conf)
+static void flush_pending_writes(conf_t *conf)
 {
        /* Any writes that have been queued but are awaiting
         * bitmap updates get flushed here.
-         * We return 1 if any requests were actually submitted.
         */
-        int rv = 0;
        spin_lock_irq(&conf->device_lock);
        if (conf->pending_bio_list.head) {
                struct bio *bio;
                bio = bio_list_get(&conf->pending_bio_list);
-                blk_remove_plug(conf->mddev->queue);
                spin_unlock_irq(&conf->device_lock);
                /* flush any pending bitmap writes to
                 * disk before proceeding w/ I/O */
@@ -605,10 +561,14 @@ static int flush_pending_writes(conf_t *conf)
                        generic_make_request(bio);
                        bio = next;
                }
-                rv = 1;
        } else
                spin_unlock_irq(&conf->device_lock);
-        return rv;
+}
+static void md_kick_device(mddev_t *mddev)
+{
+        blk_flush_plug(current);
+        md_wakeup_thread(mddev->thread);
 }
 /* Barriers....
@@ -640,8 +600,7 @@ static void raise_barrier(conf_t *conf)
        /* Wait until no block IO is waiting */
        wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting,
-                            conf->resync_lock,
+                            conf->resync_lock, md_kick_device(conf->mddev));
-                            raid1_unplug(conf->mddev->queue));
        /* block any new IO from starting */
        conf->barrier++;
@@ -649,8 +608,7 @@ static void raise_barrier(conf_t *conf)
        /* Now wait for all pending IO to complete */
        wait_event_lock_irq(conf->wait_barrier,
                            !conf->nr_pending && conf->barrier < RESYNC_DEPTH,
-                            conf->resync_lock,
+                            conf->resync_lock, md_kick_device(conf->mddev));
-                            raid1_unplug(conf->mddev->queue));
        spin_unlock_irq(&conf->resync_lock);
 }
@@ -672,7 +630,7 @@ static void wait_barrier(conf_t *conf)
                conf->nr_waiting++;
                wait_event_lock_irq(conf->wait_barrier, !conf->barrier,
                                    conf->resync_lock,
-                                    raid1_unplug(conf->mddev->queue));
+                                    md_kick_device(conf->mddev));
                conf->nr_waiting--;
        }
        conf->nr_pending++;
@@ -709,7 +667,7 @@ static void freeze_array(conf_t *conf)
                            conf->nr_pending == conf->nr_queued+1,
                            conf->resync_lock,
                            ({ flush_pending_writes(conf);
-                               raid1_unplug(conf->mddev->queue); }));
+                               md_kick_device(conf->mddev); }));
        spin_unlock_irq(&conf->resync_lock);
 }
 static void unfreeze_array(conf_t *conf)
@@ -959,7 +917,6 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                atomic_inc(&r1_bio->remaining);
                spin_lock_irqsave(&conf->device_lock, flags);
                bio_list_add(&conf->pending_bio_list, mbio);
-                blk_plug_device(mddev->queue);
                spin_unlock_irqrestore(&conf->device_lock, flags);
        }
        r1_bio_write_done(r1_bio, bio->bi_vcnt, behind_pages, behind_pages != NULL);
@@ -968,7 +925,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
        /* In case raid1d snuck in to freeze_array */
        wake_up(&conf->wait_barrier);
-        if (do_sync)
+        if (do_sync || !bitmap)
                md_wakeup_thread(mddev->thread);
        return 0;
@@ -1558,7 +1515,6 @@ static void raid1d(mddev_t *mddev)
        unsigned long flags;
        conf_t *conf = mddev->private;
        struct list_head *head = &conf->retry_list;
-        int unplug=0;
        mdk_rdev_t *rdev;
        md_check_recovery(mddev);
@@ -1566,7 +1522,7 @@ static void raid1d(mddev_t *mddev)
        for (;;) {
                char b[BDEVNAME_SIZE];
-                unplug += flush_pending_writes(conf);
+                flush_pending_writes(conf);
                spin_lock_irqsave(&conf->device_lock, flags);
                if (list_empty(head)) {
@@ -1580,10 +1536,9 @@ static void raid1d(mddev_t *mddev)
                mddev = r1_bio->mddev;
                conf = mddev->private;
-                if (test_bit(R1BIO_IsSync, &r1_bio->state)) {
+                if (test_bit(R1BIO_IsSync, &r1_bio->state))
                        sync_request_write(mddev, r1_bio);
-                        unplug = 1;
+                else {
-                } else {
                        int disk;
                        /* we got a read error. Maybe the drive is bad.  Maybe just
@@ -1633,14 +1588,11 @@ static void raid1d(mddev_t *mddev)
                                bio->bi_end_io = raid1_end_read_request;
                                bio->bi_rw = READ | do_sync;
                                bio->bi_private = r1_bio;
-                                unplug = 1;
                                generic_make_request(bio);
                        }
                }
                cond_resched();
        }
-        if (unplug)
-                unplug_slaves(mddev);
 }
@@ -2064,7 +2016,6 @@ static int run(mddev_t *mddev)
        md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
-        mddev->queue->unplug_fn = raid1_unplug;
        mddev->queue->backing_dev_info.congested_fn = raid1_congested;
        mddev->queue->backing_dev_info.congested_data = mddev;
        md_integrity_register(mddev);
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 3b607b28741b..e79f1c5bf71b 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -57,23 +57,16 @@
 */
 #define NR_RAID10_BIOS 256
-static void unplug_slaves(mddev_t *mddev);
 static void allow_barrier(conf_t *conf);
 static void lower_barrier(conf_t *conf);
 static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data)
 {
        conf_t *conf = data;
-        r10bio_t *r10_bio;
        int size = offsetof(struct r10bio_s, devs[conf->copies]);
        /* allocate a r10bio with room for raid_disks entries in the bios array */
-        r10_bio = kzalloc(size, gfp_flags);
+        return kzalloc(size, gfp_flags);
-        if (!r10_bio && conf->mddev)
-                unplug_slaves(conf->mddev);
-        return r10_bio;
 }
 static void r10bio_pool_free(void *r10_bio, void *data)
@@ -106,10 +99,8 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
        int nalloc;
        r10_bio = r10bio_pool_alloc(gfp_flags, conf);
-        if (!r10_bio) {
+        if (!r10_bio)
-                unplug_slaves(conf->mddev);
                return NULL;
-        }
        if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery))
                nalloc = conf->copies; /* resync */
@@ -597,37 +588,6 @@ rb_out:
        return disk;
 }
-static void unplug_slaves(mddev_t *mddev)
-{
-        conf_t *conf = mddev->private;
-        int i;
-        rcu_read_lock();
-        for (i=0; i < conf->raid_disks; i++) {
-                mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
-                if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
-                        struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
-                        atomic_inc(&rdev->nr_pending);
-                        rcu_read_unlock();
-                        blk_unplug(r_queue);
-                        rdev_dec_pending(rdev, mddev);
-                        rcu_read_lock();
-                }
-        }
-        rcu_read_unlock();
-}
-static void raid10_unplug(struct request_queue *q)
-{
-        mddev_t *mddev = q->queuedata;
-        unplug_slaves(q->queuedata);
-        md_wakeup_thread(mddev->thread);
-}
 static int raid10_congested(void *data, int bits)
 {
        mddev_t *mddev = data;
@@ -649,20 +609,16 @@ static int raid10_congested(void *data, int bits)
        return ret;
 }
-static int flush_pending_writes(conf_t *conf)
+static void flush_pending_writes(conf_t *conf)
 {
        /* Any writes that have been queued but are awaiting
         * bitmap updates get flushed here.
-         * We return 1 if any requests were actually submitted.
         */
-        int rv = 0;
        spin_lock_irq(&conf->device_lock);
        if (conf->pending_bio_list.head) {
                struct bio *bio;
                bio = bio_list_get(&conf->pending_bio_list);
-                blk_remove_plug(conf->mddev->queue);
                spin_unlock_irq(&conf->device_lock);
                /* flush any pending bitmap writes to disk
                 * before proceeding w/ I/O */
@@ -674,11 +630,16 @@ static int flush_pending_writes(conf_t *conf)
                        generic_make_request(bio);
                        bio = next;
                }
-                rv = 1;
        } else
                spin_unlock_irq(&conf->device_lock);
-        return rv;
 }
+static void md_kick_device(mddev_t *mddev)
+{
+        blk_flush_plug(current);
+        md_wakeup_thread(mddev->thread);
+}
 /* Barriers....
 * Sometimes we need to suspend IO while we do something else,
 * either some resync/recovery, or reconfigure the array.
@@ -708,8 +669,7 @@ static void raise_barrier(conf_t *conf, int force)
        /* Wait until no block IO is waiting (unless 'force') */
        wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting,
-                            conf->resync_lock,
+                            conf->resync_lock, md_kick_device(conf->mddev));
-                            raid10_unplug(conf->mddev->queue));
        /* block any new IO from starting */
        conf->barrier++;
@@ -717,8 +677,7 @@ static void raise_barrier(conf_t *conf, int force)
        /* No wait for all pending IO to complete */
        wait_event_lock_irq(conf->wait_barrier,
                            !conf->nr_pending && conf->barrier < RESYNC_DEPTH,
-                            conf->resync_lock,
+                            conf->resync_lock, md_kick_device(conf->mddev));
-                            raid10_unplug(conf->mddev->queue));
        spin_unlock_irq(&conf->resync_lock);
 }
@@ -739,7 +698,7 @@ static void wait_barrier(conf_t *conf)
                conf->nr_waiting++;
                wait_event_lock_irq(conf->wait_barrier, !conf->barrier,
                                    conf->resync_lock,
-                                    raid10_unplug(conf->mddev->queue));
+                                    md_kick_device(conf->mddev));
                conf->nr_waiting--;
        }
        conf->nr_pending++;
@@ -776,7 +735,7 @@ static void freeze_array(conf_t *conf)
                            conf->nr_pending == conf->nr_queued+1,
                            conf->resync_lock,
                            ({ flush_pending_writes(conf);
-                               raid10_unplug(conf->mddev->queue); }));
+                               md_kick_device(conf->mddev); }));
        spin_unlock_irq(&conf->resync_lock);
 }
@@ -971,7 +930,6 @@ static int make_request(mddev_t *mddev, struct bio * bio)
                atomic_inc(&r10_bio->remaining);
                spin_lock_irqsave(&conf->device_lock, flags);
                bio_list_add(&conf->pending_bio_list, mbio);
-                blk_plug_device(mddev->queue);
                spin_unlock_irqrestore(&conf->device_lock, flags);
        }
@@ -988,7 +946,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
        /* In case raid10d snuck in to freeze_array */
        wake_up(&conf->wait_barrier);
-        if (do_sync)
+        if (do_sync || !mddev->bitmap)
                md_wakeup_thread(mddev->thread);
        return 0;
@@ -1681,7 +1639,6 @@ static void raid10d(mddev_t *mddev)
        unsigned long flags;
        conf_t *conf = mddev->private;
        struct list_head *head = &conf->retry_list;
-        int unplug=0;
        mdk_rdev_t *rdev;
        md_check_recovery(mddev);
@@ -1689,7 +1646,7 @@ static void raid10d(mddev_t *mddev)
        for (;;) {
                char b[BDEVNAME_SIZE];
-                unplug += flush_pending_writes(conf);
+                flush_pending_writes(conf);
                spin_lock_irqsave(&conf->device_lock, flags);
                if (list_empty(head)) {
@@ -1703,13 +1660,11 @@ static void raid10d(mddev_t *mddev)
                mddev = r10_bio->mddev;
                conf = mddev->private;
-                if (test_bit(R10BIO_IsSync, &r10_bio->state)) {
+                if (test_bit(R10BIO_IsSync, &r10_bio->state))
                        sync_request_write(mddev, r10_bio);
-                        unplug = 1;
+                else if (test_bit(R10BIO_IsRecover, &r10_bio->state))
-                } else  if (test_bit(R10BIO_IsRecover, &r10_bio->state)) {
                        recovery_request_write(mddev, r10_bio);
-                        unplug = 1;
+                else {
-                } else {
                        int mirror;
                        /* we got a read error. Maybe the drive is bad.  Maybe just
                         * the block and we can fix it.
@@ -1756,14 +1711,11 @@ static void raid10d(mddev_t *mddev)
                                bio->bi_rw = READ | do_sync;
                                bio->bi_private = r10_bio;
                                bio->bi_end_io = raid10_end_read_request;
-                                unplug = 1;
                                generic_make_request(bio);
                        }
                }
                cond_resched();
        }
-        if (unplug)
-                unplug_slaves(mddev);
 }
@@ -2376,7 +2328,6 @@ static int run(mddev_t *mddev)
        md_set_array_sectors(mddev, size);
        mddev->resync_max_sectors = size;
-        mddev->queue->unplug_fn = raid10_unplug;
        mddev->queue->backing_dev_info.congested_fn = raid10_congested;
        mddev->queue->backing_dev_info.congested_data = mddev;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 702812824195..e867ee42b152 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -433,8 +433,6 @@ static int has_failed(raid5_conf_t *conf)
        return 0;
 }
-static void unplug_slaves(mddev_t *mddev);
 static struct stripe_head *
 get_active_stripe(raid5_conf_t *conf, sector_t sector,
                  int previous, int noblock, int noquiesce)
@@ -463,8 +461,7 @@ get_active_stripe(raid5_conf_t *conf, sector_t sector,
                                                     < (conf->max_nr_stripes *3/4)
                                                     || !conf->inactive_blocked),
                                                    conf->device_lock,
-                                                    md_raid5_unplug_device(conf)
+                                                    md_raid5_kick_device(conf));
-                                        );
                                conf->inactive_blocked = 0;
                        } else
                                init_stripe(sh, sector, previous);
@@ -1473,8 +1470,7 @@ static int resize_stripes(raid5_conf_t *conf, int newsize)
                wait_event_lock_irq(conf->wait_for_stripe,
                                    !list_empty(&conf->inactive_list),
                                    conf->device_lock,
-                                    unplug_slaves(conf->mddev)
+                                    blk_flush_plug(current));
-                        );
                osh = get_free_stripe(conf);
                spin_unlock_irq(&conf->device_lock);
                atomic_set(&nsh->count, 1);
@@ -3645,58 +3641,19 @@ static void activate_bit_delay(raid5_conf_t *conf)
        }
 }
-static void unplug_slaves(mddev_t *mddev)
+void md_raid5_kick_device(raid5_conf_t *conf)
 {
-        raid5_conf_t *conf = mddev->private;
+        blk_flush_plug(current);
-        int i;
+        raid5_activate_delayed(conf);
-        int devs = max(conf->raid_disks, conf->previous_raid_disks);
-        rcu_read_lock();
-        for (i = 0; i < devs; i++) {
-                mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev);
-                if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
-                        struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
-                        atomic_inc(&rdev->nr_pending);
-                        rcu_read_unlock();
-                        blk_unplug(r_queue);
-                        rdev_dec_pending(rdev, mddev);
-                        rcu_read_lock();
-                }
-        }
-        rcu_read_unlock();
-}
-void md_raid5_unplug_device(raid5_conf_t *conf)
-{
-        unsigned long flags;
-        spin_lock_irqsave(&conf->device_lock, flags);
-        if (plugger_remove_plug(&conf->plug)) {
-                conf->seq_flush++;
-                raid5_activate_delayed(conf);
-        }
        md_wakeup_thread(conf->mddev->thread);
-        spin_unlock_irqrestore(&conf->device_lock, flags);
-        unplug_slaves(conf->mddev);
 }
-EXPORT_SYMBOL_GPL(md_raid5_unplug_device);
+EXPORT_SYMBOL_GPL(md_raid5_kick_device);
 static void raid5_unplug(struct plug_handle *plug)
 {
        raid5_conf_t *conf = container_of(plug, raid5_conf_t, plug);
-        md_raid5_unplug_device(conf);
-}
-static void raid5_unplug_queue(struct request_queue *q)
+        md_raid5_kick_device(conf);
-{
-        mddev_t *mddev = q->queuedata;
-        md_raid5_unplug_device(mddev->private);
 }
 int md_raid5_congested(mddev_t *mddev, int bits)
@@ -4100,7 +4057,7 @@ static int make_request(mddev_t *mddev, struct bio * bi)
                                 * add failed due to overlap.  Flush everything
                                 * and wait a while
                                 */
-                                md_raid5_unplug_device(conf);
+                                md_raid5_kick_device(conf);
                                release_stripe(sh);
                                schedule();
                                goto retry;
@@ -4365,7 +4322,6 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
        if (sector_nr >= max_sector) {
                /* just being told to finish up .. nothing much to do */
-                unplug_slaves(mddev);
                if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
                        end_reshape(conf);
@@ -4569,7 +4525,6 @@ static void raid5d(mddev_t *mddev)
        spin_unlock_irq(&conf->device_lock);
        async_tx_issue_pending_all();
-        unplug_slaves(mddev);
        pr_debug("--- raid5d inactive\n");
 }
@@ -5205,7 +5160,6 @@ static int run(mddev_t *mddev)
                mddev->queue->backing_dev_info.congested_data = mddev;
                mddev->queue->backing_dev_info.congested_fn = raid5_congested;
                mddev->queue->queue_lock = &conf->device_lock;
-                mddev->queue->unplug_fn = raid5_unplug_queue;
                chunk_size = mddev->chunk_sectors << 9;
                blk_queue_io_min(mddev->queue, chunk_size);
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 2ace0582b409..8d563a4f022a 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -503,6 +503,6 @@ static inline int algorithm_is_DDF(int layout)
 }
 extern int md_raid5_congested(mddev_t *mddev, int bits);
-extern void md_raid5_unplug_device(raid5_conf_t *conf);
+extern void md_raid5_kick_device(raid5_conf_t *conf);
 extern int raid5_set_cache_size(mddev_t *mddev, int size);
 #endif
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index ae7cad185898..b29eb4eaa86e 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -895,11 +895,7 @@ static void i2o_block_request_fn(struct request_queue *q)
 {
        struct request *req;
-        while (!blk_queue_plugged(q)) {
+        while ((req = blk_peek_request(q)) != NULL) {
-                req = blk_peek_request(q);
-                if (!req)
-                        break;
                if (req->cmd_type == REQ_TYPE_FS) {
                        struct i2o_block_delayed_request *dreq;
                        struct i2o_block_request *ireq = req->special;
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 4e42d030e097..2ae727568df9 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -55,8 +55,7 @@ static int mmc_queue_thread(void *d)
                spin_lock_irq(q->queue_lock);
                set_current_state(TASK_INTERRUPTIBLE);
-                if (!blk_queue_plugged(q))
+                req = blk_fetch_request(q);
-                        req = blk_fetch_request(q);
                mq->req = req;
                spin_unlock_irq(q->queue_lock);
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 794bfd962266..4d2df2f76ea0 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1917,7 +1917,7 @@ static void __dasd_process_request_queue(struct dasd_block *block)
                return;
        }
        /* Now we try to fetch requests from the request queue */
-        while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
+        while ((req = blk_peek_request(queue))) {
                if (basedev->features & DASD_FEATURE_READONLY &&
                    rq_data_dir(req) == WRITE) {
                        DBF_DEV_EVENT(DBF_ERR, basedev,
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 55d2d0f4eabc..f061b2527b44 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -161,7 +161,6 @@ tapeblock_requeue(struct work_struct *work) {
        spin_lock_irq(&device->blk_data.request_queue_lock);
        while (
-                !blk_queue_plugged(queue) &&
                blk_peek_request(queue) &&
                nr_queued < TAPEBLOCK_MIN_REQUEUE
        ) {
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 998c01be3234..2cefabd5bdb5 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -3913,7 +3913,7 @@ fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
        if (!get_device(dev))
                return;
-        while (!blk_queue_plugged(q)) {
+        while (1) {
                if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
                    !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
                        break;
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 927e99cb7225..c6fcf76cade5 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -173,11 +173,7 @@ static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
        int ret;
        int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
-        while (!blk_queue_plugged(q)) {
+        while ((req = blk_fetch_request(q)) != NULL) {
-                req = blk_fetch_request(q);
-                if (!req)
-                        break;
                spin_unlock_irq(q->queue_lock);
                handler = to_sas_internal(shost->transportt)->f->smp_handler;
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 67f0c09983c8..c1b539d7b0d3 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -392,9 +392,8 @@ static int iblock_do_task(struct se_task *task)
 {
        struct se_device *dev = task->task_se_cmd->se_dev;
        struct iblock_req *req = IBLOCK_REQ(task);
-        struct iblock_dev *ibd = (struct iblock_dev *)req->ib_dev;
-        struct request_queue *q = bdev_get_queue(ibd->ibd_bd);
        struct bio *bio = req->ib_bio, *nbio = NULL;
+        struct blk_plug plug;
        int rw;
        if (task->task_data_direction == DMA_TO_DEVICE) {
@@ -412,6 +411,7 @@ static int iblock_do_task(struct se_task *task)
                rw = READ;
        }
+        blk_start_plug(&plug);
        while (bio) {
                nbio = bio->bi_next;
                bio->bi_next = NULL;
@@ -421,9 +421,8 @@ static int iblock_do_task(struct se_task *task)
                submit_bio(rw, bio);
                bio = nbio;
        }
+        blk_finish_plug(&plug);
-        if (q->unplug_fn)
-                q->unplug_fn(q);
        return PYX_TRANSPORT_SENT_TO_TRANSPORT;
 }
diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
index 65794b8fe79e..1cc84b276131 100644
--- a/fs/adfs/inode.c
+++ b/fs/adfs/inode.c
@@ -73,7 +73,6 @@ static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations adfs_aops = {
        .readpage       = adfs_readpage,
        .writepage      = adfs_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = adfs_write_begin,
        .write_end      = generic_write_end,
        .bmap           = _adfs_bmap
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 0a90dcd46de2..acf321b70fcd 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -429,7 +429,6 @@ static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations affs_aops = {
        .readpage = affs_readpage,
        .writepage = affs_writepage,
-        .sync_page = block_sync_page,
        .write_begin = affs_write_begin,
        .write_end = generic_write_end,
        .bmap = _affs_bmap
@@ -786,7 +785,6 @@ out:
 const struct address_space_operations affs_aops_ofs = {
        .readpage = affs_readpage_ofs,
        //.writepage = affs_writepage_ofs,
-        //.sync_page = affs_sync_page_ofs,
        .write_begin = affs_write_begin_ofs,
        .write_end = affs_write_end_ofs
 };
diff --git a/fs/aio.c b/fs/aio.c
index fc557a3be0a9..c5ea494ea9e2 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1550,9 +1550,11 @@ static void aio_batch_free(struct hlist_head *batch_hash)
        struct hlist_node *pos, *n;
        int i;
+        /*
+         * TODO: kill this
+         */
        for (i = 0; i < AIO_BATCH_HASH_SIZE; i++) {
                hlist_for_each_entry_safe(abe, pos, n, &batch_hash[i], list) {
-                        blk_run_address_space(abe->mapping);
                        iput(abe->mapping->host);
                        hlist_del(&abe->list);
                        mempool_free(abe, abe_pool);
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index b1d0c794747b..06457ed8f3e7 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -75,7 +75,6 @@ static const struct inode_operations befs_dir_inode_operations = {
 static const struct address_space_operations befs_aops = {
        .readpage       = befs_readpage,
-        .sync_page      = block_sync_page,
        .bmap           = befs_bmap,
 };
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index eb67edd0f8ea..f20e8a71062f 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -186,7 +186,6 @@ static sector_t bfs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations bfs_aops = {
        .readpage       = bfs_readpage,
        .writepage      = bfs_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = bfs_write_begin,
        .write_end      = generic_write_end,
        .bmap           = bfs_bmap,
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 4fb8a3431531..fffc2c672396 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1520,7 +1520,6 @@ static int blkdev_releasepage(struct page *page, gfp_t wait)
 static const struct address_space_operations def_blk_aops = {
        .readpage       = blkdev_readpage,
        .writepage      = blkdev_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = blkdev_write_begin,
        .write_end      = blkdev_write_end,
        .writepages     = generic_writepages,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e1aa8d607bc7..ada1f6bd0a57 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -847,7 +847,6 @@ static const struct address_space_operations btree_aops = {
        .writepages     = btree_writepages,
        .releasepage    = btree_releasepage,
        .invalidatepage = btree_invalidatepage,
-        .sync_page      = block_sync_page,
 #ifdef CONFIG_MIGRATION
        .migratepage    = btree_migratepage,
 #endif
@@ -1331,82 +1330,6 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
 }
 /*
- * this unplugs every device on the box, and it is only used when page
- * is null
- */
-static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-        struct btrfs_device *device;
-        struct btrfs_fs_info *info;
-        info = (struct btrfs_fs_info *)bdi->unplug_io_data;
-        list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
-                if (!device->bdev)
-                        continue;
-                bdi = blk_get_backing_dev_info(device->bdev);
-                if (bdi->unplug_io_fn)
-                        bdi->unplug_io_fn(bdi, page);
-        }
-}
-static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-        struct inode *inode;
-        struct extent_map_tree *em_tree;
-        struct extent_map *em;
-        struct address_space *mapping;
-        u64 offset;
-        /* the generic O_DIRECT read code does this */
-        if (1 || !page) {
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-        /*
-         * page->mapping may change at any time.  Get a consistent copy
-         * and use that for everything below
-         */
-        smp_mb();
-        mapping = page->mapping;
-        if (!mapping)
-                return;
-        inode = mapping->host;
-        /*
-         * don't do the expensive searching for a small number of
-         * devices
-         */
-        if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-        offset = page_offset(page);
-        em_tree = &BTRFS_I(inode)->extent_tree;
-        read_lock(&em_tree->lock);
-        em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
-        read_unlock(&em_tree->lock);
-        if (!em) {
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-        if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
-                free_extent_map(em);
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-        offset = offset - em->start;
-        btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
-                          em->block_start + offset, page);
-        free_extent_map(em);
-}
-/*
 * If this fails, caller must call bdi_destroy() to get rid of the
 * bdi again.
 */
@@ -1420,8 +1343,6 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
                return err;
        bdi->ra_pages   = default_backing_dev_info.ra_pages;
-        bdi->unplug_io_fn       = btrfs_unplug_io_fn;
-        bdi->unplug_io_data     = info;
        bdi->congested_fn       = btrfs_congested_fn;
        bdi->congested_data     = info;
        return 0;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fb9bd7832b6d..462e08e724b0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7218,7 +7218,6 @@ static const struct address_space_operations btrfs_aops = {
        .writepage      = btrfs_writepage,
        .writepages     = btrfs_writepages,
        .readpages      = btrfs_readpages,
-        .sync_page      = block_sync_page,
        .direct_IO      = btrfs_direct_IO,
        .invalidatepage = btrfs_invalidatepage,
        .releasepage    = btrfs_releasepage,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index af7dbca15276..6e0e82a1b188 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -162,7 +162,6 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
        struct bio *cur;
        int again = 0;
        unsigned long num_run;
-        unsigned long num_sync_run;
        unsigned long batch_run = 0;
        unsigned long limit;
        unsigned long last_waited = 0;
@@ -173,11 +172,6 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
        limit = btrfs_async_submit_limit(fs_info);
        limit = limit * 2 / 3;
-        /* we want to make sure that every time we switch from the sync
-         * list to the normal list, we unplug
-         */
-        num_sync_run = 0;
 loop:
        spin_lock(&device->io_lock);
@@ -223,15 +217,6 @@ loop_lock:
        spin_unlock(&device->io_lock);
-        /*
-         * if we're doing the regular priority list, make sure we unplug
-         * for any high prio bios we've sent down
-         */
-        if (pending_bios == &device->pending_bios && num_sync_run > 0) {
-                num_sync_run = 0;
-                blk_run_backing_dev(bdi, NULL);
-        }
        while (pending) {
                rmb();
@@ -259,19 +244,11 @@ loop_lock:
                BUG_ON(atomic_read(&cur->bi_cnt) == 0);
-                if (cur->bi_rw & REQ_SYNC)
-                        num_sync_run++;
                submit_bio(cur->bi_rw, cur);
                num_run++;
                batch_run++;
-                if (need_resched()) {
+                if (need_resched())
-                        if (num_sync_run) {
-                                blk_run_backing_dev(bdi, NULL);
-                                num_sync_run = 0;
-                        }
                        cond_resched();
-                }
                /*
                 * we made progress, there is more work to do and the bdi
@@ -304,13 +281,8 @@ loop_lock:
                                 * against it before looping
                                 */
                                last_waited = ioc->last_waited;
-                                if (need_resched()) {
+                                if (need_resched())
-                                        if (num_sync_run) {
-                                                blk_run_backing_dev(bdi, NULL);
-                                                num_sync_run = 0;
-                                        }
                                        cond_resched();
-                                }
                                continue;
                        }
                        spin_lock(&device->io_lock);
@@ -323,22 +295,6 @@ loop_lock:
                }
        }
-        if (num_sync_run) {
-                num_sync_run = 0;
-                blk_run_backing_dev(bdi, NULL);
-        }
-        /*
-         * IO has already been through a long path to get here.  Checksumming,
-         * async helper threads, perhaps compression.  We've done a pretty
-         * good job of collecting a batch of IO and should just unplug
-         * the device right away.
-         *
-         * This will help anyone who is waiting on the IO, they might have
-         * already unplugged, but managed to do so before the bio they
-         * cared about found its way down here.
-         */
-        blk_run_backing_dev(bdi, NULL);
        cond_resched();
        if (again)
                goto loop;
@@ -2948,7 +2904,7 @@ static int find_live_mirror(struct map_lookup *map, int first, int num,
 static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
                             u64 logical, u64 *length,
                             struct btrfs_multi_bio **multi_ret,
-                             int mirror_num, struct page *unplug_page)
+                             int mirror_num)
 {
        struct extent_map *em;
        struct map_lookup *map;
@@ -2980,11 +2936,6 @@ again:
        em = lookup_extent_mapping(em_tree, logical, *length);
        read_unlock(&em_tree->lock);
-        if (!em && unplug_page) {
-                kfree(multi);
-                return 0;
-        }
        if (!em) {
                printk(KERN_CRIT "unable to find logical %llu len %llu\n",
                       (unsigned long long)logical,
@@ -3040,13 +2991,13 @@ again:
                *length = em->len - offset;
        }
-        if (!multi_ret && !unplug_page)
+        if (!multi_ret)
                goto out;
        num_stripes = 1;
        stripe_index = 0;
        if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
-                if (unplug_page || (rw & REQ_WRITE))
+                if (rw & REQ_WRITE)
                        num_stripes = map->num_stripes;
                else if (mirror_num)
                        stripe_index = mirror_num - 1;
@@ -3068,7 +3019,7 @@ again:
                stripe_index = do_div(stripe_nr, factor);
                stripe_index *= map->sub_stripes;
-                if (unplug_page || (rw & REQ_WRITE))
+                if (rw & REQ_WRITE)
                        num_stripes = map->sub_stripes;
                else if (mirror_num)
                        stripe_index += mirror_num - 1;
@@ -3088,22 +3039,10 @@ again:
        BUG_ON(stripe_index >= map->num_stripes);
        for (i = 0; i < num_stripes; i++) {
-                if (unplug_page) {
+                multi->stripes[i].physical =
-                        struct btrfs_device *device;
+                        map->stripes[stripe_index].physical +
-                        struct backing_dev_info *bdi;
+                        stripe_offset + stripe_nr * map->stripe_len;
+                multi->stripes[i].dev = map->stripes[stripe_index].dev;
-                        device = map->stripes[stripe_index].dev;
-                        if (device->bdev) {
-                                bdi = blk_get_backing_dev_info(device->bdev);
-                                if (bdi->unplug_io_fn)
-                                        bdi->unplug_io_fn(bdi, unplug_page);
-                        }
-                } else {
-                        multi->stripes[i].physical =
-                                map->stripes[stripe_index].physical +
-                                stripe_offset + stripe_nr * map->stripe_len;
-                        multi->stripes[i].dev = map->stripes[stripe_index].dev;
-                }
                stripe_index++;
        }
        if (multi_ret) {
@@ -3121,7 +3060,7 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
                      struct btrfs_multi_bio **multi_ret, int mirror_num)
 {
        return __btrfs_map_block(map_tree, rw, logical, length, multi_ret,
-                                 mirror_num, NULL);
+                                 mirror_num);
 }
 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
@@ -3189,14 +3128,6 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
        return 0;
 }
-int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
-                      u64 logical, struct page *page)
-{
-        u64 length = PAGE_CACHE_SIZE;
-        return __btrfs_map_block(map_tree, READ, logical, &length,
-                                 NULL, 0, page);
-}
 static void end_bio_multi_stripe(struct bio *bio, int err)
 {
        struct btrfs_multi_bio *multi = bio->bi_private;
diff --git a/fs/buffer.c b/fs/buffer.c
index 2219a76e2caf..f903f2e5b4fe 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -54,23 +54,15 @@ init_buffer(struct buffer_head *bh, bh_end_io_t *handler, void *private)
 }
 EXPORT_SYMBOL(init_buffer);
-static int sync_buffer(void *word)
+static int sleep_on_buffer(void *word)
 {
-        struct block_device *bd;
-        struct buffer_head *bh
-                = container_of(word, struct buffer_head, b_state);
-        smp_mb();
-        bd = bh->b_bdev;
-        if (bd)
-                blk_run_address_space(bd->bd_inode->i_mapping);
        io_schedule();
        return 0;
 }
 void __lock_buffer(struct buffer_head *bh)
 {
-        wait_on_bit_lock(&bh->b_state, BH_Lock, sync_buffer,
+        wait_on_bit_lock(&bh->b_state, BH_Lock, sleep_on_buffer,
                                                        TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL(__lock_buffer);
@@ -90,7 +82,7 @@ EXPORT_SYMBOL(unlock_buffer);
 */
 void __wait_on_buffer(struct buffer_head * bh)
 {
-        wait_on_bit(&bh->b_state, BH_Lock, sync_buffer, TASK_UNINTERRUPTIBLE);
+        wait_on_bit(&bh->b_state, BH_Lock, sleep_on_buffer, TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL(__wait_on_buffer);
@@ -749,7 +741,7 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
 {
        struct buffer_head *bh;
        struct list_head tmp;
-        struct address_space *mapping, *prev_mapping = NULL;
+        struct address_space *mapping;
        int err = 0, err2;
        INIT_LIST_HEAD(&tmp);
@@ -783,10 +775,6 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
                                 * wait_on_buffer() will do that for us
                                 * through sync_buffer().
                                 */
-                                if (prev_mapping && prev_mapping != mapping)
-                                        blk_run_address_space(prev_mapping);
-                                prev_mapping = mapping;
                                brelse(bh);
                                spin_lock(lock);
                        }
@@ -3138,17 +3126,6 @@ out:
 }
 EXPORT_SYMBOL(try_to_free_buffers);
-void block_sync_page(struct page *page)
-{
-        struct address_space *mapping;
-        smp_mb();
-        mapping = page_mapping(page);
-        if (mapping)
-                blk_run_backing_dev(mapping->backing_dev_info, page);
-}
-EXPORT_SYMBOL(block_sync_page);
 /*
 * There are no bdflush tunables left.  But distributions are
 * still running obsolete flush daemons, so we terminate them here.
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index e964b1cd5dd0..c27d236738fc 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1569,34 +1569,6 @@ int cifs_fsync(struct file *file, int datasync)
        return rc;
 }
-/* static void cifs_sync_page(struct page *page)
-{
-        struct address_space *mapping;
-        struct inode *inode;
-        unsigned long index = page->index;
-        unsigned int rpages = 0;
-        int rc = 0;
-        cFYI(1, "sync page %p", page);
-        mapping = page->mapping;
-        if (!mapping)
-                return 0;
-        inode = mapping->host;
-        if (!inode)
-                return; */
-/*      fill in rpages then
-        result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
-/*      cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index);
-#if 0
-        if (rc < 0)
-                return rc;
-        return 0;
-#endif
-} */
 /*
 * As file closes, flush all cached write data for this inode checking
 * for write behind errors.
@@ -2510,7 +2482,6 @@ const struct address_space_operations cifs_addr_ops = {
        .set_page_dirty = __set_page_dirty_nobuffers,
        .releasepage = cifs_release_page,
        .invalidatepage = cifs_invalidate_page,
-        /* .sync_page = cifs_sync_page, */
        /* .direct_IO = */
 };
@@ -2528,6 +2499,5 @@ const struct address_space_operations cifs_addr_ops_smallbuf = {
        .set_page_dirty = __set_page_dirty_nobuffers,
        .releasepage = cifs_release_page,
        .invalidatepage = cifs_invalidate_page,
-        /* .sync_page = cifs_sync_page, */
        /* .direct_IO = */
 };
diff --git a/fs/direct-io.c b/fs/direct-io.c
index b044705eedd4..df709b3b860a 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1110,11 +1110,8 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
            ((rw & READ) || (dio->result == dio->size)))
                ret = -EIOCBQUEUED;
-        if (ret != -EIOCBQUEUED) {
+        if (ret != -EIOCBQUEUED)
-                /* All IO is now issued, send it on its way */
-                blk_run_address_space(inode->i_mapping);
                dio_await_completion(dio);
-        }
        /*
         * Sync will always be dropping the final ref and completing the
diff --git a/fs/efs/inode.c b/fs/efs/inode.c
index a8e7797b9477..9c13412e6c99 100644
--- a/fs/efs/inode.c
+++ b/fs/efs/inode.c
@@ -23,7 +23,6 @@ static sector_t _efs_bmap(struct address_space *mapping, sector_t block)
 }
 static const struct address_space_operations efs_aops = {
        .readpage = efs_readpage,
-        .sync_page = block_sync_page,
        .bmap = _efs_bmap
 };
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index a7555238c41a..82b94c8f5d22 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -795,7 +795,6 @@ const struct address_space_operations exofs_aops = {
        .direct_IO      = NULL, /* TODO: Should be trivial to do */
        /* With these NULL has special meaning or default is not exported */
-        .sync_page      = NULL,
        .get_xip_mem    = NULL,
        .migratepage    = NULL,
        .launder_page   = NULL,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 40ad210a5049..c47f706878b5 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -860,7 +860,6 @@ const struct address_space_operations ext2_aops = {
        .readpage               = ext2_readpage,
        .readpages              = ext2_readpages,
        .writepage              = ext2_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext2_write_begin,
        .write_end              = ext2_write_end,
        .bmap                   = ext2_bmap,
@@ -880,7 +879,6 @@ const struct address_space_operations ext2_nobh_aops = {
        .readpage               = ext2_readpage,
        .readpages              = ext2_readpages,
        .writepage              = ext2_nobh_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext2_nobh_write_begin,
        .write_end              = nobh_write_end,
        .bmap                   = ext2_bmap,
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index ae94f6d949f5..fe2541d250e4 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1894,7 +1894,6 @@ static const struct address_space_operations ext3_ordered_aops = {
        .readpage               = ext3_readpage,
        .readpages              = ext3_readpages,
        .writepage              = ext3_ordered_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext3_write_begin,
        .write_end              = ext3_ordered_write_end,
        .bmap                   = ext3_bmap,
@@ -1910,7 +1909,6 @@ static const struct address_space_operations ext3_writeback_aops = {
        .readpage               = ext3_readpage,
        .readpages              = ext3_readpages,
        .writepage              = ext3_writeback_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext3_write_begin,
        .write_end              = ext3_writeback_write_end,
        .bmap                   = ext3_bmap,
@@ -1926,7 +1924,6 @@ static const struct address_space_operations ext3_journalled_aops = {
        .readpage               = ext3_readpage,
        .readpages              = ext3_readpages,
        .writepage              = ext3_journalled_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext3_write_begin,
        .write_end              = ext3_journalled_write_end,
        .set_page_dirty         = ext3_journalled_set_page_dirty,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9f7f9e49914f..9297ad46c465 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3903,7 +3903,6 @@ static const struct address_space_operations ext4_ordered_aops = {
        .readpage               = ext4_readpage,
        .readpages              = ext4_readpages,
        .writepage              = ext4_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext4_write_begin,
        .write_end              = ext4_ordered_write_end,
        .bmap                   = ext4_bmap,
@@ -3919,7 +3918,6 @@ static const struct address_space_operations ext4_writeback_aops = {
        .readpage               = ext4_readpage,
        .readpages              = ext4_readpages,
        .writepage              = ext4_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext4_write_begin,
        .write_end              = ext4_writeback_write_end,
        .bmap                   = ext4_bmap,
@@ -3935,7 +3933,6 @@ static const struct address_space_operations ext4_journalled_aops = {
        .readpage               = ext4_readpage,
        .readpages              = ext4_readpages,
        .writepage              = ext4_writepage,
-        .sync_page              = block_sync_page,
        .write_begin            = ext4_write_begin,
        .write_end              = ext4_journalled_write_end,
        .set_page_dirty         = ext4_journalled_set_page_dirty,
@@ -3951,7 +3948,6 @@ static const struct address_space_operations ext4_da_aops = {
        .readpages              = ext4_readpages,
        .writepage              = ext4_writepage,
        .writepages             = ext4_da_writepages,
-        .sync_page              = block_sync_page,
        .write_begin            = ext4_da_write_begin,
        .write_end              = ext4_da_write_end,
        .bmap                   = ext4_bmap,
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 86753fe10bd1..f4ff09fb79b1 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -236,7 +236,6 @@ static const struct address_space_operations fat_aops = {
        .readpages      = fat_readpages,
        .writepage      = fat_writepage,
        .writepages     = fat_writepages,
-        .sync_page      = block_sync_page,
        .write_begin    = fat_write_begin,
        .write_end      = fat_write_end,
        .direct_IO      = fat_direct_IO,
diff --git a/fs/freevxfs/vxfs_subr.c b/fs/freevxfs/vxfs_subr.c
index 1429f3ae1e86..5d318c44f855 100644
--- a/fs/freevxfs/vxfs_subr.c
+++ b/fs/freevxfs/vxfs_subr.c
@@ -44,7 +44,6 @@ static sector_t		vxfs_bmap(struct address_space *, sector_t);
 const struct address_space_operations vxfs_aops = {
        .readpage =             vxfs_readpage,
        .bmap =                 vxfs_bmap,
-        .sync_page =            block_sync_page,
 };
 inline void
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 9e3f68cc1bd1..09e8d51eeb64 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -868,7 +868,6 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
        fc->bdi.name = "fuse";
        fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
-        fc->bdi.unplug_io_fn = default_unplug_io_fn;
        /* fuse does it's own writeback accounting */
        fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 4f36f8832b9b..2f87ad27efd0 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1116,7 +1116,6 @@ static const struct address_space_operations gfs2_writeback_aops = {
        .writepages = gfs2_writeback_writepages,
        .readpage = gfs2_readpage,
        .readpages = gfs2_readpages,
-        .sync_page = block_sync_page,
        .write_begin = gfs2_write_begin,
        .write_end = gfs2_write_end,
        .bmap = gfs2_bmap,
@@ -1132,7 +1131,6 @@ static const struct address_space_operations gfs2_ordered_aops = {
        .writepage = gfs2_ordered_writepage,
        .readpage = gfs2_readpage,
        .readpages = gfs2_readpages,
-        .sync_page = block_sync_page,
        .write_begin = gfs2_write_begin,
        .write_end = gfs2_write_end,
        .set_page_dirty = gfs2_set_page_dirty,
@@ -1150,7 +1148,6 @@ static const struct address_space_operations gfs2_jdata_aops = {
        .writepages = gfs2_jdata_writepages,
        .readpage = gfs2_readpage,
        .readpages = gfs2_readpages,
-        .sync_page = block_sync_page,
        .write_begin = gfs2_write_begin,
        .write_end = gfs2_write_end,
        .set_page_dirty = gfs2_set_page_dirty,
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 939739c7b3f9..a566331db4e1 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -94,7 +94,6 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
 const struct address_space_operations gfs2_meta_aops = {
        .writepage = gfs2_aspace_writepage,
        .releasepage = gfs2_releasepage,
-        .sync_page = block_sync_page,
 };
 /**
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index dffb4e996643..fff16c968e67 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -150,7 +150,6 @@ static int hfs_writepages(struct address_space *mapping,
 const struct address_space_operations hfs_btree_aops = {
        .readpage       = hfs_readpage,
        .writepage      = hfs_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = hfs_write_begin,
        .write_end      = generic_write_end,
        .bmap           = hfs_bmap,
@@ -160,7 +159,6 @@ const struct address_space_operations hfs_btree_aops = {
 const struct address_space_operations hfs_aops = {
        .readpage       = hfs_readpage,
        .writepage      = hfs_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = hfs_write_begin,
        .write_end      = generic_write_end,
        .bmap           = hfs_bmap,
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index a8df651747f0..b248a6cfcad9 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -146,7 +146,6 @@ static int hfsplus_writepages(struct address_space *mapping,
 const struct address_space_operations hfsplus_btree_aops = {
        .readpage       = hfsplus_readpage,
        .writepage      = hfsplus_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = hfsplus_write_begin,
        .write_end      = generic_write_end,
        .bmap           = hfsplus_bmap,
@@ -156,7 +155,6 @@ const struct address_space_operations hfsplus_btree_aops = {
 const struct address_space_operations hfsplus_aops = {
        .readpage       = hfsplus_readpage,
        .writepage      = hfsplus_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = hfsplus_write_begin,
        .write_end      = generic_write_end,
        .bmap           = hfsplus_bmap,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index c0340887c7ea..9e84257b3ad5 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -120,7 +120,6 @@ static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations hpfs_aops = {
        .readpage = hpfs_readpage,
        .writepage = hpfs_writepage,
-        .sync_page = block_sync_page,
        .write_begin = hpfs_write_begin,
        .write_end = generic_write_end,
        .bmap = _hpfs_bmap
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index a0f3833c0dbf..3db5ba4568fc 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1158,7 +1158,6 @@ static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations isofs_aops = {
        .readpage = isofs_readpage,
-        .sync_page = block_sync_page,
        .bmap = _isofs_bmap
 };
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 9978803ceedc..eddbb373209e 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -352,7 +352,6 @@ const struct address_space_operations jfs_aops = {
        .readpages      = jfs_readpages,
        .writepage      = jfs_writepage,
        .writepages     = jfs_writepages,
-        .sync_page      = block_sync_page,
        .write_begin    = jfs_write_begin,
        .write_end      = nobh_write_end,
        .bmap           = jfs_bmap,
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 48b44bd8267b..6740d34cd82b 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -583,7 +583,6 @@ static void metapage_invalidatepage(struct page *page, unsigned long offset)
 const struct address_space_operations jfs_metapage_aops = {
        .readpage       = metapage_readpage,
        .writepage      = metapage_writepage,
-        .sync_page      = block_sync_page,
        .releasepage    = metapage_releasepage,
        .invalidatepage = metapage_invalidatepage,
        .set_page_dirty = __set_page_dirty_nobuffers,
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 723bc5bca09a..1adc8d455f0e 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -39,7 +39,6 @@ static int sync_request(struct page *page, struct block_device *bdev, int rw)
        bio.bi_end_io = request_complete;
        submit_bio(rw, &bio);
-        generic_unplug_device(bdev_get_queue(bdev));
        wait_for_completion(&complete);
        return test_bit(BIO_UPTODATE, &bio.bi_flags) ? 0 : -EIO;
 }
@@ -168,7 +167,6 @@ static void bdev_writeseg(struct super_block *sb, u64 ofs, size_t len)
        }
        len = PAGE_ALIGN(len);
        __bdev_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);
-        generic_unplug_device(bdev_get_queue(logfs_super(sb)->s_bdev));
 }
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index ae0b83f476a6..adcdc0a4e182 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -399,7 +399,6 @@ static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations minix_aops = {
        .readpage = minix_readpage,
        .writepage = minix_writepage,
-        .sync_page = block_sync_page,
        .write_begin = minix_write_begin,
        .write_end = generic_write_end,
        .bmap = minix_bmap
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 388e9e8f5286..f4f1c08807ed 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -40,14 +40,10 @@ void nilfs_btnode_cache_init_once(struct address_space *btnc)
        nilfs_mapping_init_once(btnc);
 }
-static const struct address_space_operations def_btnode_aops = {
-        .sync_page              = block_sync_page,
-};
 void nilfs_btnode_cache_init(struct address_space *btnc,
                             struct backing_dev_info *bdi)
 {
-        nilfs_mapping_init(btnc, bdi, &def_btnode_aops);
+        nilfs_mapping_init(btnc, bdi);
 }
 void nilfs_btnode_cache_clear(struct address_space *btnc)
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index caf9a6a3fb54..1c2a3e23f8b2 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -49,7 +49,6 @@
 #include "ifile.h"
 static const struct address_space_operations def_gcinode_aops = {
-        .sync_page              = block_sync_page,
 };
 /*
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 2fd440d8d6b8..c89d5d1ea7c7 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -262,7 +262,6 @@ nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 const struct address_space_operations nilfs_aops = {
        .writepage              = nilfs_writepage,
        .readpage               = nilfs_readpage,
-        .sync_page              = block_sync_page,
        .writepages             = nilfs_writepages,
        .set_page_dirty         = nilfs_set_page_dirty,
        .readpages              = nilfs_readpages,
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 6a0e2a189f60..3fdb61d79c9a 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -399,7 +399,6 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
 static const struct address_space_operations def_mdt_aops = {
        .writepage              = nilfs_mdt_write_page,
-        .sync_page              = block_sync_page,
 };
 static const struct inode_operations def_mdt_iops;
@@ -438,10 +437,6 @@ void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size,
        mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
 }
-static const struct address_space_operations shadow_map_aops = {
-        .sync_page              = block_sync_page,
-};
 /**
 * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
 * @inode: inode of the metadata file
@@ -455,9 +450,9 @@ int nilfs_mdt_setup_shadow_map(struct inode *inode,
        INIT_LIST_HEAD(&shadow->frozen_buffers);
        nilfs_mapping_init_once(&shadow->frozen_data);
-        nilfs_mapping_init(&shadow->frozen_data, bdi, &shadow_map_aops);
+        nilfs_mapping_init(&shadow->frozen_data, bdi);
        nilfs_mapping_init_once(&shadow->frozen_btnodes);
-        nilfs_mapping_init(&shadow->frozen_btnodes, bdi, &shadow_map_aops);
+        nilfs_mapping_init(&shadow->frozen_btnodes, bdi);
        mi->mi_shadow = shadow;
        return 0;
 }
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 0c432416cfef..3da37cc5de34 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -506,15 +506,14 @@ void nilfs_mapping_init_once(struct address_space *mapping)
 }
 void nilfs_mapping_init(struct address_space *mapping,
-                        struct backing_dev_info *bdi,
+                        struct backing_dev_info *bdi)
-                        const struct address_space_operations *aops)
 {
        mapping->host = NULL;
        mapping->flags = 0;
        mapping_set_gfp_mask(mapping, GFP_NOFS);
        mapping->assoc_mapping = NULL;
        mapping->backing_dev_info = bdi;
-        mapping->a_ops = aops;
+        mapping->a_ops = NULL;
 }
 /*
diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h
index 622df27cd891..ba4d6fd40b04 100644
--- a/fs/nilfs2/page.h
+++ b/fs/nilfs2/page.h
@@ -63,8 +63,7 @@ void nilfs_copy_back_pages(struct address_space *, struct address_space *);
 void nilfs_clear_dirty_pages(struct address_space *);
 void nilfs_mapping_init_once(struct address_space *mapping);
 void nilfs_mapping_init(struct address_space *mapping,
-                        struct backing_dev_info *bdi,
+                        struct backing_dev_info *bdi);
-                        const struct address_space_operations *aops);
 unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
 unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
                                            sector_t start_blk,
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index c3c2c7ac9020..0b1e885b8cf8 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -1543,8 +1543,6 @@ err_out:
 */
 const struct address_space_operations ntfs_aops = {
        .readpage       = ntfs_readpage,        /* Fill page with data. */
-        .sync_page      = block_sync_page,      /* Currently, just unplugs the
-                                                   disk request queue. */
 #ifdef NTFS_RW
        .writepage      = ntfs_writepage,       /* Write dirty page to disk. */
 #endif /* NTFS_RW */
@@ -1560,8 +1558,6 @@ const struct address_space_operations ntfs_aops = {
 */
 const struct address_space_operations ntfs_mst_aops = {
        .readpage       = ntfs_readpage,        /* Fill page with data. */
-        .sync_page      = block_sync_page,      /* Currently, just unplugs the
-                                                   disk request queue. */
 #ifdef NTFS_RW
        .writepage      = ntfs_writepage,       /* Write dirty page to disk. */
        .set_page_dirty = __set_page_dirty_nobuffers,   /* Set the page dirty
diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
index 6551c7cbad92..ef9ed854255c 100644
--- a/fs/ntfs/compress.c
+++ b/fs/ntfs/compress.c
@@ -698,8 +698,7 @@ lock_retry_remap:
                                        "uptodate! Unplugging the disk queue "
                                        "and rescheduling.");
                        get_bh(tbh);
-                        blk_run_address_space(mapping);
+                        io_schedule();
-                        schedule();
                        put_bh(tbh);
                        if (unlikely(!buffer_uptodate(tbh)))
                                goto read_err;
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 1fbb0e20131b..daea0359e974 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2043,7 +2043,6 @@ const struct address_space_operations ocfs2_aops = {
        .write_begin            = ocfs2_write_begin,
        .write_end              = ocfs2_write_end,
        .bmap                   = ocfs2_bmap,
-        .sync_page              = block_sync_page,
        .direct_IO              = ocfs2_direct_IO,
        .invalidatepage         = ocfs2_invalidatepage,
        .releasepage            = ocfs2_releasepage,
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index b108e863d8f6..1adab287bd24 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -367,11 +367,7 @@ static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
 static void o2hb_wait_on_io(struct o2hb_region *reg,
                            struct o2hb_bio_wait_ctxt *wc)
 {
-        struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping;
-        blk_run_address_space(mapping);
        o2hb_bio_wait_dec(wc, 1);
        wait_for_completion(&wc->wc_io_complete);
 }
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index 8a6d34fa668a..d738a7e493dd 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -372,7 +372,6 @@ const struct address_space_operations omfs_aops = {
        .readpages = omfs_readpages,
        .writepage = omfs_writepage,
        .writepages = omfs_writepages,
-        .sync_page = block_sync_page,
        .write_begin = omfs_write_begin,
        .write_end = generic_write_end,
        .bmap = omfs_bmap,
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index e63b4171d583..2b0646613f5a 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -335,7 +335,6 @@ static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations qnx4_aops = {
        .readpage       = qnx4_readpage,
        .writepage      = qnx4_writepage,
-        .sync_page      = block_sync_page,
        .write_begin    = qnx4_write_begin,
        .write_end      = generic_write_end,
        .bmap           = qnx4_bmap
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 0bae036831e2..03674675f886 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3212,7 +3212,6 @@ const struct address_space_operations reiserfs_address_space_operations = {
        .readpages = reiserfs_readpages,
        .releasepage = reiserfs_releasepage,
        .invalidatepage = reiserfs_invalidatepage,
-        .sync_page = block_sync_page,
        .write_begin = reiserfs_write_begin,
        .write_end = reiserfs_write_end,
        .bmap = reiserfs_aop_bmap,
diff --git a/fs/sysv/itree.c b/fs/sysv/itree.c
index 9ca66276315e..fa8d43c92bb8 100644
--- a/fs/sysv/itree.c
+++ b/fs/sysv/itree.c
@@ -488,7 +488,6 @@ static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations sysv_aops = {
        .readpage = sysv_readpage,
        .writepage = sysv_writepage,
-        .sync_page = block_sync_page,
        .write_begin = sysv_write_begin,
        .write_end = generic_write_end,
        .bmap = sysv_bmap
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 6e11c2975dcf..81368d4d4a2c 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1979,7 +1979,6 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
         */
        c->bdi.name = "ubifs",
        c->bdi.capabilities = BDI_CAP_MAP_COPY;
-        c->bdi.unplug_io_fn = default_unplug_io_fn;
        err  = bdi_init(&c->bdi);
        if (err)
                goto out_close;
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 89c78486cbbe..94e4553491c9 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -98,7 +98,6 @@ static int udf_adinicb_write_end(struct file *file,
 const struct address_space_operations udf_adinicb_aops = {
        .readpage       = udf_adinicb_readpage,
        .writepage      = udf_adinicb_writepage,
-        .sync_page      = block_sync_page,
        .write_begin = simple_write_begin,
        .write_end = udf_adinicb_write_end,
 };
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index c6a2e782b97b..fa96fc0fe12b 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -133,7 +133,6 @@ static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations udf_aops = {
        .readpage       = udf_readpage,
        .writepage      = udf_writepage,
-        .sync_page      = block_sync_page,
        .write_begin            = udf_write_begin,
        .write_end              = generic_write_end,
        .bmap           = udf_bmap,
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 2b251f2093af..83b28444eb17 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -588,7 +588,6 @@ static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations ufs_aops = {
        .readpage = ufs_readpage,
        .writepage = ufs_writepage,
-        .sync_page = block_sync_page,
        .write_begin = ufs_write_begin,
        .write_end = generic_write_end,
        .bmap = ufs_bmap
diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c
index a58f9155fc9a..ff0e79276f2d 100644
--- a/fs/ufs/truncate.c
+++ b/fs/ufs/truncate.c
@@ -481,7 +481,7 @@ int ufs_truncate(struct inode *inode, loff_t old_i_size)
                        break;
                if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
                        ufs_sync_inode (inode);
-                blk_run_address_space(inode->i_mapping);
+                blk_flush_plug(current);
                yield();
        }
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index ec7bbb5645b6..83c1c20d145a 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -1495,7 +1495,6 @@ const struct address_space_operations xfs_address_space_operations = {
        .readpages              = xfs_vm_readpages,
        .writepage              = xfs_vm_writepage,
        .writepages             = xfs_vm_writepages,
-        .sync_page              = block_sync_page,
        .releasepage            = xfs_vm_releasepage,
        .invalidatepage         = xfs_vm_invalidatepage,
        .write_begin            = xfs_vm_write_begin,
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index ac1c7e8378dd..4f8f53c4d42c 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -991,7 +991,7 @@ xfs_buf_lock(
        if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
                xfs_log_force(bp->b_target->bt_mount, 0);
        if (atomic_read(&bp->b_io_remaining))
-                blk_run_address_space(bp->b_target->bt_mapping);
+                blk_flush_plug(current);
        down(&bp->b_sema);
        XB_SET_OWNER(bp);
@@ -1035,9 +1035,7 @@ xfs_buf_wait_unpin(
                set_current_state(TASK_UNINTERRUPTIBLE);
                if (atomic_read(&bp->b_pin_count) == 0)
                        break;
-                if (atomic_read(&bp->b_io_remaining))
+                io_schedule();
-                        blk_run_address_space(bp->b_target->bt_mapping);
-                schedule();
        }
        remove_wait_queue(&bp->b_waiters, &wait);
        set_current_state(TASK_RUNNING);
@@ -1443,7 +1441,7 @@ xfs_buf_iowait(
        trace_xfs_buf_iowait(bp, _RET_IP_);
        if (atomic_read(&bp->b_io_remaining))
-                blk_run_address_space(bp->b_target->bt_mapping);
+                blk_flush_plug(current);
        wait_for_completion(&bp->b_iowait);
        trace_xfs_buf_iowait_done(bp, _RET_IP_);
@@ -1667,7 +1665,6 @@ xfs_mapping_buftarg(
        struct inode            *inode;
        struct address_space    *mapping;
        static const struct address_space_operations mapping_aops = {
-                .sync_page = block_sync_page,
                .migratepage = fail_migrate_page,
        };
@@ -1948,7 +1945,7 @@ xfsbufd(
                        count++;
                }
                if (count)
-                        blk_run_address_space(target->bt_mapping);
+                        blk_flush_plug(current);
        } while (!kthread_should_stop());
@@ -1996,7 +1993,7 @@ xfs_flush_buftarg(
        if (wait) {
                /* Expedite and wait for IO to complete. */
-                blk_run_address_space(target->bt_mapping);
+                blk_flush_plug(current);
                while (!list_empty(&wait_list)) {
                        bp = list_first_entry(&wait_list, struct xfs_buf, b_list);
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 4ce34fa937d4..96f4094b706d 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -66,8 +66,6 @@ struct backing_dev_info {
        unsigned int capabilities; /* Device capabilities */
        congested_fn *congested_fn; /* Function pointer if device is md/dm */
        void *congested_data;   /* Pointer to aux data for congested func */
-        void (*unplug_io_fn)(struct backing_dev_info *, struct page *);
-        void *unplug_io_data;
        char *name;
@@ -251,7 +249,6 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
 extern struct backing_dev_info default_backing_dev_info;
 extern struct backing_dev_info noop_backing_dev_info;
-void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page);
 int writeback_in_progress(struct backing_dev_info *bdi);
@@ -336,17 +333,4 @@ static inline int bdi_sched_wait(void *word)
        return 0;
 }
-static inline void blk_run_backing_dev(struct backing_dev_info *bdi,
-                                       struct page *page)
-{
-        if (bdi && bdi->unplug_io_fn)
-                bdi->unplug_io_fn(bdi, page);
-}
-static inline void blk_run_address_space(struct address_space *mapping)
-{
-        if (mapping)
-                blk_run_backing_dev(mapping->backing_dev_info, NULL);
-}
 #endif          /* _LINUX_BACKING_DEV_H */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 5873037eeb91..64ab2a1bb167 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -196,7 +196,6 @@ typedef void (request_fn_proc) (struct request_queue *q);
 typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
 typedef int (prep_rq_fn) (struct request_queue *, struct request *);
 typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
-typedef void (unplug_fn) (struct request_queue *);
 struct bio_vec;
 struct bvec_merge_data {
@@ -279,7 +278,6 @@ struct request_queue
        make_request_fn         *make_request_fn;
        prep_rq_fn              *prep_rq_fn;
        unprep_rq_fn            *unprep_rq_fn;
-        unplug_fn               *unplug_fn;
        merge_bvec_fn           *merge_bvec_fn;
        softirq_done_fn         *softirq_done_fn;
        rq_timed_out_fn         *rq_timed_out_fn;
@@ -293,14 +291,6 @@ struct request_queue
        struct request          *boundary_rq;
        /*
-         * Auto-unplugging state
-         */
-        struct timer_list       unplug_timer;
-        int                     unplug_thresh;  /* After this many requests */
-        unsigned long           unplug_delay;   /* After this many jiffies */
-        struct work_struct      unplug_work;
-        /*
         * Delayed queue handling
         */
        struct delayed_work     delay_work;
@@ -399,14 +389,13 @@ struct request_queue
 #define QUEUE_FLAG_ASYNCFULL    4       /* write queue has been filled */
 #define QUEUE_FLAG_DEAD         5       /* queue being torn down */
 #define QUEUE_FLAG_REENTER      6       /* Re-entrancy avoidance */
-#define QUEUE_FLAG_PLUGGED      7       /* queue is plugged */
+#define QUEUE_FLAG_ELVSWITCH    7       /* don't use elevator, just do FIFO */
-#define QUEUE_FLAG_ELVSWITCH    8       /* don't use elevator, just do FIFO */
+#define QUEUE_FLAG_BIDI         8       /* queue supports bidi requests */
-#define QUEUE_FLAG_BIDI         9       /* queue supports bidi requests */
+#define QUEUE_FLAG_NOMERGES     9       /* disable merge attempts */
-#define QUEUE_FLAG_NOMERGES    10       /* disable merge attempts */
+#define QUEUE_FLAG_SAME_COMP   10       /* force complete on same CPU */
-#define QUEUE_FLAG_SAME_COMP   11       /* force complete on same CPU */
+#define QUEUE_FLAG_FAIL_IO     11       /* fake timeout */
-#define QUEUE_FLAG_FAIL_IO     12       /* fake timeout */
+#define QUEUE_FLAG_STACKABLE   12       /* supports request stacking */
-#define QUEUE_FLAG_STACKABLE   13       /* supports request stacking */
+#define QUEUE_FLAG_NONROT      13       /* non-rotational device (SSD) */
-#define QUEUE_FLAG_NONROT      14       /* non-rotational device (SSD) */
 #define QUEUE_FLAG_VIRT        QUEUE_FLAG_NONROT /* paravirt device */
 #define QUEUE_FLAG_IO_STAT     15       /* do IO stats */
 #define QUEUE_FLAG_DISCARD     16       /* supports DISCARD */
@@ -484,7 +473,6 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
        __clear_bit(flag, &q->queue_flags);
 }
-#define blk_queue_plugged(q)    test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
 #define blk_queue_tagged(q)     test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
 #define blk_queue_stopped(q)    test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
 #define blk_queue_nomerges(q)   test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
@@ -679,9 +667,6 @@ extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
 extern void blk_rq_unprep_clone(struct request *rq);
 extern int blk_insert_cloned_request(struct request_queue *q,
                                     struct request *rq);
-extern void blk_plug_device(struct request_queue *);
-extern void blk_plug_device_unlocked(struct request_queue *);
-extern int blk_remove_plug(struct request_queue *);
 extern void blk_delay_queue(struct request_queue *, unsigned long);
 extern void blk_recount_segments(struct request_queue *, struct bio *);
 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
@@ -726,7 +711,6 @@ extern int blk_execute_rq(struct request_queue *, struct gendisk *,
                          struct request *, int);
 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
                                  struct request *, int, rq_end_io_fn *);
-extern void blk_unplug(struct request_queue *q);
 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
 {
@@ -863,7 +847,6 @@ extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bd
 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
 extern void blk_dump_rq_flags(struct request *, char *);
-extern void generic_unplug_device(struct request_queue *);
 extern long nr_blockdev_pages(void);
 int blk_get_queue(struct request_queue *);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 68d1fe7b877c..f5df23561b96 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -219,7 +219,6 @@ int generic_cont_expand_simple(struct inode *inode, loff_t size);
 int block_commit_write(struct page *page, unsigned from, unsigned to);
 int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
                                get_block_t get_block);
-void block_sync_page(struct page *);
 sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *);
 int block_truncate_page(struct address_space *, loff_t, get_block_t *);
 int nobh_write_begin(struct address_space *, loff_t, unsigned, unsigned,
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 272496d1fae4..e2768834f397 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -286,11 +286,6 @@ void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callback
 int dm_table_complete(struct dm_table *t);
 /*
- * Unplug all devices in a table.
- */
-void dm_table_unplug_all(struct dm_table *t);
-/*
 * Table reference counting.
 */
 struct dm_table *dm_get_live_table(struct mapped_device *md);
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 8857cf9adbb7..ec6f72b84477 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -20,7 +20,6 @@ typedef void (elevator_bio_merged_fn) (struct request_queue *,
 typedef int (elevator_dispatch_fn) (struct request_queue *, int);
 typedef void (elevator_add_req_fn) (struct request_queue *, struct request *);
-typedef int (elevator_queue_empty_fn) (struct request_queue *);
 typedef struct request *(elevator_request_list_fn) (struct request_queue *, struct request *);
 typedef void (elevator_completed_req_fn) (struct request_queue *, struct request *);
 typedef int (elevator_may_queue_fn) (struct request_queue *, int);
@@ -46,7 +45,6 @@ struct elevator_ops
        elevator_activate_req_fn *elevator_activate_req_fn;
        elevator_deactivate_req_fn *elevator_deactivate_req_fn;
-        elevator_queue_empty_fn *elevator_queue_empty_fn;
        elevator_completed_req_fn *elevator_completed_req_fn;
        elevator_request_list_fn *elevator_former_req_fn;
@@ -101,8 +99,8 @@ struct elevator_queue
 */
 extern void elv_dispatch_sort(struct request_queue *, struct request *);
 extern void elv_dispatch_add_tail(struct request_queue *, struct request *);
-extern void elv_add_request(struct request_queue *, struct request *, int, int);
+extern void elv_add_request(struct request_queue *, struct request *, int);
-extern void __elv_add_request(struct request_queue *, struct request *, int, int);
+extern void __elv_add_request(struct request_queue *, struct request *, int);
 extern void elv_insert(struct request_queue *, struct request *, int);
 extern int elv_merge(struct request_queue *, struct request **, struct bio *);
 extern int elv_try_merge(struct request *, struct bio *);
@@ -112,7 +110,6 @@ extern void elv_merged_request(struct request_queue *, struct request *, int);
 extern void elv_bio_merged(struct request_queue *q, struct request *,
                                struct bio *);
 extern void elv_requeue_request(struct request_queue *, struct request *);
-extern int elv_queue_empty(struct request_queue *);
 extern struct request *elv_former_request(struct request_queue *, struct request *);
 extern struct request *elv_latter_request(struct request_queue *, struct request *);
 extern int elv_register_queue(struct request_queue *q);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index bd3215940c37..9f2cf69911b8 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -583,7 +583,6 @@ typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
 struct address_space_operations {
        int (*writepage)(struct page *page, struct writeback_control *wbc);
        int (*readpage)(struct file *, struct page *);
-        void (*sync_page)(struct page *);
        /* Write back some dirty pages from this mapping. */
        int (*writepages)(struct address_space *, struct writeback_control *);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 9c66e994540f..e112b8db2f3c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -298,7 +298,6 @@ static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
 extern void __lock_page(struct page *page);
 extern int __lock_page_killable(struct page *page);
-extern void __lock_page_nosync(struct page *page);
 extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
                                unsigned int flags);
 extern void unlock_page(struct page *page);
@@ -342,17 +341,6 @@ static inline int lock_page_killable(struct page *page)
 }
 /*
- * lock_page_nosync should only be used if we can't pin the page's inode.
- * Doesn't play quite so well with block device plugging.
- */
-static inline void lock_page_nosync(struct page *page)
-{
-        might_sleep();
-        if (!trylock_page(page))
-                __lock_page_nosync(page);
-}
-        
-/*
 * lock_page_or_retry - Lock the page, unless this would block and the
 * caller indicated that it can handle a retry.
 */
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4d559325d919..9ee321833b21 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -299,8 +299,6 @@ extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
                                        struct page **pagep, swp_entry_t *ent);
 #endif
-extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
 #ifdef CONFIG_SWAP
 /* linux/mm/page_io.c */
 extern int swap_readpage(struct page *);
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 027100d30227..c91e139a652e 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -14,17 +14,11 @@
 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
-void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-}
-EXPORT_SYMBOL(default_unplug_io_fn);
 struct backing_dev_info default_backing_dev_info = {
        .name           = "default",
        .ra_pages       = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
        .state          = 0,
        .capabilities   = BDI_CAP_MAP_COPY,
-        .unplug_io_fn   = default_unplug_io_fn,
 };
 EXPORT_SYMBOL_GPL(default_backing_dev_info);
diff --git a/mm/filemap.c b/mm/filemap.c
index 83a45d35468b..380776c2a9ac 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -155,45 +155,15 @@ void remove_from_page_cache(struct page *page)
 }
 EXPORT_SYMBOL(remove_from_page_cache);
-static int sync_page(void *word)
+static int sleep_on_page(void *word)
 {
-        struct address_space *mapping;
-        struct page *page;
-        page = container_of((unsigned long *)word, struct page, flags);
-        /*
-         * page_mapping() is being called without PG_locked held.
-         * Some knowledge of the state and use of the page is used to
-         * reduce the requirements down to a memory barrier.
-         * The danger here is of a stale page_mapping() return value
-         * indicating a struct address_space different from the one it's
-         * associated with when it is associated with one.
-         * After smp_mb(), it's either the correct page_mapping() for
-         * the page, or an old page_mapping() and the page's own
-         * page_mapping() has gone NULL.
-         * The ->sync_page() address_space operation must tolerate
-         * page_mapping() going NULL. By an amazing coincidence,
-         * this comes about because none of the users of the page
-         * in the ->sync_page() methods make essential use of the
-         * page_mapping(), merely passing the page down to the backing
-         * device's unplug functions when it's non-NULL, which in turn
-         * ignore it for all cases but swap, where only page_private(page) is
-         * of interest. When page_mapping() does go NULL, the entire
-         * call stack gracefully ignores the page and returns.
-         * -- wli
-         */
-        smp_mb();
-        mapping = page_mapping(page);
-        if (mapping && mapping->a_ops && mapping->a_ops->sync_page)
-                mapping->a_ops->sync_page(page);
        io_schedule();
        return 0;
 }
-static int sync_page_killable(void *word)
+static int sleep_on_page_killable(void *word)
 {
-        sync_page(word);
+        sleep_on_page(word);
        return fatal_signal_pending(current) ? -EINTR : 0;
 }
@@ -479,12 +449,6 @@ struct page *__page_cache_alloc(gfp_t gfp)
 EXPORT_SYMBOL(__page_cache_alloc);
 #endif
-static int __sleep_on_page_lock(void *word)
-{
-        io_schedule();
-        return 0;
-}
 /*
 * In order to wait for pages to become available there must be
 * waitqueues associated with pages. By using a hash table of
@@ -512,7 +476,7 @@ void wait_on_page_bit(struct page *page, int bit_nr)
        DEFINE_WAIT_BIT(wait, &page->flags, bit_nr);
        if (test_bit(bit_nr, &page->flags))
-                __wait_on_bit(page_waitqueue(page), &wait, sync_page,
+                __wait_on_bit(page_waitqueue(page), &wait, sleep_on_page,
                                                        TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL(wait_on_page_bit);
@@ -576,17 +540,12 @@ EXPORT_SYMBOL(end_page_writeback);
 /**
 * __lock_page - get a lock on the page, assuming we need to sleep to get it
 * @page: the page to lock
- *
- * Ugly. Running sync_page() in state TASK_UNINTERRUPTIBLE is scary.  If some
- * random driver's requestfn sets TASK_RUNNING, we could busywait.  However
- * chances are that on the second loop, the block layer's plug list is empty,
- * so sync_page() will then return in state TASK_UNINTERRUPTIBLE.
 */
 void __lock_page(struct page *page)
 {
        DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
-        __wait_on_bit_lock(page_waitqueue(page), &wait, sync_page,
+        __wait_on_bit_lock(page_waitqueue(page), &wait, sleep_on_page,
                                                        TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL(__lock_page);
@@ -596,24 +555,10 @@ int __lock_page_killable(struct page *page)
        DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
        return __wait_on_bit_lock(page_waitqueue(page), &wait,
-                                        sync_page_killable, TASK_KILLABLE);
+                                        sleep_on_page_killable, TASK_KILLABLE);
 }
 EXPORT_SYMBOL_GPL(__lock_page_killable);
-/**
- * __lock_page_nosync - get a lock on the page, without calling sync_page()
- * @page: the page to lock
- *
- * Variant of lock_page that does not require the caller to hold a reference
- * on the page's mapping.
- */
-void __lock_page_nosync(struct page *page)
-{
-        DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
-        __wait_on_bit_lock(page_waitqueue(page), &wait, __sleep_on_page_lock,
-                                                        TASK_UNINTERRUPTIBLE);
-}
 int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
                         unsigned int flags)
 {
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 0207c2f6f8bd..bfba796d374d 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -945,7 +945,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
                collect_procs(ppage, &tokill);
        if (hpage != ppage)
-                lock_page_nosync(ppage);
+                lock_page(ppage);
        ret = try_to_unmap(ppage, ttu);
        if (ret != SWAP_SUCCESS)
@@ -1038,7 +1038,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
                         * Check "just unpoisoned", "filter hit", and
                         * "race with other subpage."
                         */
-                        lock_page_nosync(hpage);
+                        lock_page(hpage);
                        if (!PageHWPoison(hpage)
                            || (hwpoison_filter(p) && TestClearPageHWPoison(p))
                            || (p != hpage && TestSetPageHWPoison(hpage))) {
@@ -1088,7 +1088,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
         * It's very difficult to mess with pages currently under IO
         * and in many cases impossible, so we just avoid it here.
         */
-        lock_page_nosync(hpage);
+        lock_page(hpage);
        /*
         * unpoison always clear PG_hwpoison inside page lock
@@ -1231,7 +1231,7 @@ int unpoison_memory(unsigned long pfn)
                return 0;
        }
-        lock_page_nosync(page);
+        lock_page(page);
        /*
         * This test is racy because PG_hwpoison is set outside of page lock.
         * That's acceptable because that won't trigger kernel panic. Instead,
diff --git a/mm/nommu.c b/mm/nommu.c
index f59e1424d3db..fb6cbd6abe16 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1842,10 +1842,6 @@ int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 }
 EXPORT_SYMBOL(remap_vmalloc_range);
-void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-}
 unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr,
        unsigned long len, unsigned long pgoff, unsigned long flags)
 {
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2cb01f6ec5d0..cc0ede169e41 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1239,7 +1239,7 @@ int set_page_dirty_lock(struct page *page)
 {
        int ret;
-        lock_page_nosync(page);
+        lock_page(page);
        ret = set_page_dirty(page);
        unlock_page(page);
        return ret;
diff --git a/mm/readahead.c b/mm/readahead.c
index 77506a291a2d..cbddc3e17246 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -554,17 +554,5 @@ page_cache_async_readahead(struct address_space *mapping,
        /* do read-ahead */
        ondemand_readahead(mapping, ra, filp, true, offset, req_size);
-#ifdef CONFIG_BLOCK
-        /*
-         * Normally the current page is !uptodate and lock_page() will be
-         * immediately called to implicitly unplug the device. However this
-         * is not always true for RAID conifgurations, where data arrives
-         * not strictly in their submission order. In this case we need to
-         * explicitly kick off the IO.
-         */
-        if (PageUptodate(page))
-                blk_run_backing_dev(mapping->backing_dev_info, NULL);
-#endif
 }
 EXPORT_SYMBOL_GPL(page_cache_async_readahead);
diff --git a/mm/shmem.c b/mm/shmem.c
index 5ee67c990602..24d23f5bedf1 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -224,7 +224,6 @@ static const struct vm_operations_struct shmem_vm_ops;
 static struct backing_dev_info shmem_backing_dev_info  __read_mostly = {
        .ra_pages       = 0,    /* No readahead */
        .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED,
-        .unplug_io_fn   = default_unplug_io_fn,
 };
 static LIST_HEAD(shmem_swaplist);
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 5c8cfabbc9bc..46680461785b 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -24,12 +24,10 @@
 /*
 * swapper_space is a fiction, retained to simplify the path through
- * vmscan's shrink_page_list, to make sync_page look nicer, and to allow
+ * vmscan's shrink_page_list.
- * future use of radix_tree tags in the swap cache.
 */
 static const struct address_space_operations swap_aops = {
        .writepage      = swap_writepage,
-        .sync_page      = block_sync_page,
        .set_page_dirty = __set_page_dirty_nobuffers,
        .migratepage    = migrate_page,
 };
@@ -37,7 +35,6 @@ static const struct address_space_operations swap_aops = {
 static struct backing_dev_info swap_backing_dev_info = {
        .name           = "swap",
        .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED,
-        .unplug_io_fn   = swap_unplug_io_fn,
 };
 struct address_space swapper_space = {
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 07a458d72fa8..7ceea78ceb20 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -95,39 +95,6 @@ __try_to_reclaim_swap(struct swap_info_struct *si, unsigned long offset)
 }
 /*
- * We need this because the bdev->unplug_fn can sleep and we cannot
- * hold swap_lock while calling the unplug_fn. And swap_lock
- * cannot be turned into a mutex.
- */
-static DECLARE_RWSEM(swap_unplug_sem);
-void swap_unplug_io_fn(struct backing_dev_info *unused_bdi, struct page *page)
-{
-        swp_entry_t entry;
-        down_read(&swap_unplug_sem);
-        entry.val = page_private(page);
-        if (PageSwapCache(page)) {
-                struct block_device *bdev = swap_info[swp_type(entry)]->bdev;
-                struct backing_dev_info *bdi;
-                /*
-                 * If the page is removed from swapcache from under us (with a
-                 * racy try_to_unuse/swapoff) we need an additional reference
-                 * count to avoid reading garbage from page_private(page) above.
-                 * If the WARN_ON triggers during a swapoff it maybe the race
-                 * condition and it's harmless. However if it triggers without
-                 * swapoff it signals a problem.
-                 */
-                WARN_ON(page_count(page) <= 1);
-                bdi = bdev->bd_inode->i_mapping->backing_dev_info;
-                blk_run_backing_dev(bdi, page);
-        }
-        up_read(&swap_unplug_sem);
-}
-/*
 * swapon tell device that all the old swap contents can be discarded,
 * to allow the swap device to optimize its wear-levelling.
 */
@@ -1643,10 +1610,6 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
                goto out_dput;
        }
-        /* wait for any unplug function to finish */
-        down_write(&swap_unplug_sem);
-        up_write(&swap_unplug_sem);
        destroy_swap_extents(p);
        if (p->flags & SWP_CONTINUED)
                free_swap_count_continuations(p);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 17497d0cd8b9..251bed73ac03 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -358,7 +358,7 @@ static int may_write_to_queue(struct backing_dev_info *bdi,
 static void handle_write_error(struct address_space *mapping,
                                struct page *page, int error)
 {
-        lock_page_nosync(page);
+        lock_page(page);
        if (page_mapping(page) == mapping)
                mapping_set_error(mapping, error);
        unlock_page(page);