block: implement and enforce request peek/start/fetch

Till now block layer allowed two separate modes of request execution.
A request is always acquired from the request queue via
elv_next_request().  After that, drivers are free to either dequeue it
or process it without dequeueing.  Dequeue allows elv_next_request()
to return the next request so that multiple requests can be in flight.

Executing requests without dequeueing has its merits mostly in
allowing drivers for simpler devices which can't do sg to deal with
segments only without considering request boundary.  However, the
benefit this brings is dubious and declining while the cost of the API
ambiguity is increasing.  Segment based drivers are usually for very
old or limited devices and as converting to dequeueing model isn't
difficult, it doesn't justify the API overhead it puts on block layer
and its more modern users.

Previous patches converted all block low level drivers to dequeueing
model.  This patch completes the API transition by...

* renaming elv_next_request() to blk_peek_request()

* renaming blkdev_dequeue_request() to blk_start_request()

* adding blk_fetch_request() which is combination of peek and start

* disallowing completion of queued (not started) requests

* applying new API to all LLDs

Renamings are for consistency and to break out of tree code so that
it's apparent that out of tree drivers need updating.

[ Impact: block request issue API cleanup, no functional change ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: unsik Kim <donari75@gmail.com>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Tim Waugh <tim@cyberelk.net>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Laurent Vivier <Laurent@lvivier.info>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Stefan Weinhuber <wein@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

37 files changed, 80 insertions, 161 deletions

diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 774ab05973a..668dc234b8e 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -3321,7 +3321,7 @@ static int DAC960_process_queue(DAC960_Controller_T *Controller, struct request_
 	DAC960_Command_T *Command;
 
    while(1) {
-	Request = elv_next_request(req_q);
+	Request = blk_peek_request(req_q);
 	if (!Request)
 		return 1;
 
@@ -3341,7 +3341,7 @@ static int DAC960_process_queue(DAC960_Controller_T *Controller, struct request_
 	Command->BlockNumber = blk_rq_pos(Request);
 	Command->BlockCount = blk_rq_sectors(Request);
 	Command->Request = Request;
-	blkdev_dequeue_request(Request);
+	blk_start_request(Request);
 	Command->SegmentCount = blk_rq_map_sg(req_q,
 		  Command->Request, Command->cmd_sglist);
 	/* pci_map_sg MAY change the value of SegCount */
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 80a68b2e045..9c6e5b0fe89 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -1342,12 +1342,11 @@ static void redo_fd_request(void)
 	int err;
 
 next_req:
-	rq = elv_next_request(floppy_queue);
+	rq = blk_fetch_request(floppy_queue);
 	if (!rq) {
 		/* Nothing left to do */
 		return;
 	}
-	blkdev_dequeue_request(rq);
 
 	floppy = rq->rq_disk->private_data;
 	drive = floppy - unit;
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 89a591d9c83..f5e7180d7f4 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -1404,10 +1404,9 @@ static void redo_fd_request(void)
 
 repeat:
 	if (!fd_request) {
-		fd_request = elv_next_request(floppy_queue);
+		fd_request = blk_fetch_request(floppy_queue);
 		if (!fd_request)
 			goto the_end;
-		blkdev_dequeue_request(fd_request);
 	}
 
 	floppy = fd_request->rq_disk->private_data;
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index ab7b04c0db7..e714e7cce6f 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2801,7 +2801,7 @@ static void do_cciss_request(struct request_queue *q)
 		goto startio;
 
       queue:
-	creq = elv_next_request(q);
+	creq = blk_peek_request(q);
 	if (!creq)
 		goto startio;
 
@@ -2810,7 +2810,7 @@ static void do_cciss_request(struct request_queue *q)
 	if ((c = cmd_alloc(h, 1)) == NULL)
 		goto full;
 
-	blkdev_dequeue_request(creq);
+	blk_start_request(creq);
 
 	spin_unlock_irq(q->queue_lock);
 
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index a5caeff4718..a02dcfc00f1 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -903,7 +903,7 @@ static void do_ida_request(struct request_queue *q)
 		goto startio;
 
 queue_next:
-	creq = elv_next_request(q);
+	creq = blk_peek_request(q);
 	if (!creq)
 		goto startio;
 
@@ -912,7 +912,7 @@ queue_next:
 	if ((c = cmd_alloc(h,1)) == NULL)
 		goto startio;
 
-	blkdev_dequeue_request(creq);
+	blk_start_request(creq);
 
 	c->ctlr = h->ctlr;
 	c->hdr.unit = (drv_info_t *)(creq->rq_disk->private_data) - h->drv;
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index e2c70d2085a..90877fee0ee 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -931,7 +931,7 @@ static inline void unlock_fdc(void)
 	del_timer(&fd_timeout);
 	cont = NULL;
 	clear_bit(0, &fdc_busy);
-	if (current_req || elv_next_request(floppy_queue))
+	if (current_req || blk_peek_request(floppy_queue))
 		do_fd_request(floppy_queue);
 	spin_unlock_irqrestore(&floppy_lock, flags);
 	wake_up(&fdc_wait);
@@ -2912,9 +2912,7 @@ static void redo_fd_request(void)
 			struct request *req;
 
 			spin_lock_irq(floppy_queue->queue_lock);
-			req = elv_next_request(floppy_queue);
-			if (req)
-				blkdev_dequeue_request(req);
+			req = blk_fetch_request(floppy_queue);
 			spin_unlock_irq(floppy_queue->queue_lock);
 			if (!req) {
 				do_floppy = NULL;
diff --git a/drivers/block/hd.c b/drivers/block/hd.c
index 288ab63c102..961de56d00a 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -592,12 +592,11 @@ repeat:
 	del_timer(&device_timer);
 
 	if (!hd_req) {
-		hd_req = elv_next_request(hd_queue);
+		hd_req = blk_fetch_request(hd_queue);
 		if (!hd_req) {
 			do_hd = NULL;
 			return;
 		}
-		blkdev_dequeue_request(hd_req);
 	}
 	req = hd_req;
 
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index 1ca5d1423fa..c0cd0a03f69 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -671,10 +671,8 @@ static void mg_request_poll(struct request_queue *q)
 
 	while (1) {
 		if (!host->req) {
-			host->req = elv_next_request(q);
-			if (host->req)
-				blkdev_dequeue_request(host->req);
-			else
+			host->req = blk_fetch_request(q);
+			if (!host->req)
 				break;
 		}
 
@@ -744,10 +742,8 @@ static void mg_request(struct request_queue *q)
 
 	while (1) {
 		if (!host->req) {
-			host->req = elv_next_request(q);
-			if (host->req)
-				blkdev_dequeue_request(host->req);
-			else
+			host->req = blk_fetch_request(q);
+			if (!host->req)
 				break;
 		}
 		req = host->req;
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index fad167de23b..5d23ffad7c7 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -533,11 +533,9 @@ static void do_nbd_request(struct request_queue *q)
 {
 	struct request *req;
 	
-	while ((req = elv_next_request(q)) != NULL) {
+	while ((req = blk_fetch_request(q)) != NULL) {
 		struct nbd_device *lo;
 
-		blkdev_dequeue_request(req);
-
 		spin_unlock_irq(q->queue_lock);
 
 		dprintk(DBG_BLKDEV, "%s: request %p: dequeued (flags=%x)\n",
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 425f81586a3..911dfd98d81 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -720,10 +720,9 @@ static void do_pcd_request(struct request_queue * q)
 		return;
 	while (1) {
 		if (!pcd_req) {
-			pcd_req = elv_next_request(q);
+			pcd_req = blk_fetch_request(q);
 			if (!pcd_req)
 				return;
-			blkdev_dequeue_request(pcd_req);
 		}
 
 		if (rq_data_dir(pcd_req) == READ) {
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index d2ca3f55206..bf5955b3d87 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -412,11 +412,9 @@ static void run_fsm(void)
 				spin_lock_irqsave(&pd_lock, saved_flags);
 				if (!__blk_end_request_cur(pd_req,
 						res == Ok ? 0 : -EIO)) {
-					pd_req = elv_next_request(pd_queue);
+					pd_req = blk_fetch_request(pd_queue);
 					if (!pd_req)
 						stop = 1;
-					else
-						blkdev_dequeue_request(pd_req);
 				}
 				spin_unlock_irqrestore(&pd_lock, saved_flags);
 				if (stop)
@@ -706,10 +704,9 @@ static void do_pd_request(struct request_queue * q)
 {
 	if (pd_req)
 		return;
-	pd_req = elv_next_request(q);
+	pd_req = blk_fetch_request(q);
 	if (!pd_req)
 		return;
-	blkdev_dequeue_request(pd_req);
 
 	schedule_fsm();
 }
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index d6f7bd84ed3..68a90834e99 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -762,10 +762,9 @@ static void do_pf_request(struct request_queue * q)
 		return;
 repeat:
 	if (!pf_req) {
-		pf_req = elv_next_request(q);
+		pf_req = blk_fetch_request(q);
 		if (!pf_req)
 			return;
-		blkdev_dequeue_request(pf_req);
 	}
 
 	pf_current = pf_req->rq_disk->private_data;
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index f4d8db944e7..338cee4cc0b 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -194,9 +194,7 @@ static void ps3disk_do_request(struct ps3_storage_device *dev,
 
 	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 
-	while ((req = elv_next_request(q))) {
-		blkdev_dequeue_request(req);
-
+	while ((req = blk_fetch_request(q))) {
 		if (blk_fs_request(req)) {
 			if (ps3disk_submit_request_sg(dev, req))
 				break;
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 9f351bfa15e..cbfd9c0aef0 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -441,12 +441,11 @@ out:
 static void do_vdc_request(struct request_queue *q)
 {
 	while (1) {
-		struct request *req = elv_next_request(q);
+		struct request *req = blk_fetch_request(q);
 
 		if (!req)
 			break;
 
-		blkdev_dequeue_request(req);
 		if (__send_request(req) < 0)
 			__blk_end_request_all(req, -EIO);
 	}
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index dedd4893f5e..cf7877fb8a7 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -528,10 +528,7 @@ static void redo_fd_request(struct request_queue *q)
 	struct request *req;
 	struct floppy_state *fs;
 
-	req = elv_next_request(q);
-	if (req)
-		blkdev_dequeue_request(req);
-
+	req = blk_fetch_request(q);
 	while (req) {
 		int err = -EIO;
 
@@ -554,11 +551,8 @@ static void redo_fd_request(struct request_queue *q)
 			break;
 		}
 	done:
-		if (!__blk_end_request_cur(req, err)) {
-			req = elv_next_request(q);
-			if (req)
-				blkdev_dequeue_request(req);
-		}
+		if (!__blk_end_request_cur(req, err))
+			req = blk_fetch_request(q);
 	}
 }
 
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index f48c6dd47e0..80df93e3cdd 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -326,10 +326,9 @@ static void start_request(struct floppy_state *fs)
 	}
 	while (fs->state == idle) {
 		if (!fd_req) {
-			fd_req = elv_next_request(swim3_queue);
+			fd_req = blk_fetch_request(swim3_queue);
 			if (!fd_req)
 				break;
-			blkdev_dequeue_request(fd_req);
 		}
 		req = fd_req;
 #if 0
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 087c94c8b2d..da403b6a7f4 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -810,12 +810,10 @@ static void carm_oob_rq_fn(struct request_queue *q)
 
 	while (1) {
 		DPRINTK("get req\n");
-		rq = elv_next_request(q);
+		rq = blk_fetch_request(q);
 		if (!rq)
 			break;
 
-		blkdev_dequeue_request(rq);
-
 		crq = rq->special;
 		assert(crq != NULL);
 		assert(crq->rq == rq);
@@ -846,7 +844,7 @@ static void carm_rq_fn(struct request_queue *q)
 
 queue_one_request:
 	VPRINTK("get req\n");
-	rq = elv_next_request(q);
+	rq = blk_peek_request(q);
 	if (!rq)
 		return;
 
@@ -857,7 +855,7 @@ queue_one_request:
 	}
 	crq->rq = rq;
 
-	blkdev_dequeue_request(rq);
+	blk_start_request(rq);
 
 	if (rq_data_dir(rq) == WRITE) {
 		writing = 1;
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 40d03cf63f2..178f459a50e 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -627,7 +627,7 @@ static void ub_request_fn(struct request_queue *q)
 	struct ub_lun *lun = q->queuedata;
 	struct request *rq;
 
-	while ((rq = elv_next_request(q)) != NULL) {
+	while ((rq = blk_peek_request(q)) != NULL) {
 		if (ub_request_fn_1(lun, rq) != 0) {
 			blk_stop_queue(q);
 			break;
@@ -643,13 +643,13 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
 	int n_elem;
 
 	if (atomic_read(&sc->poison)) {
-		blkdev_dequeue_request(rq);
+		blk_start_request(rq);
 		ub_end_rq(rq, DID_NO_CONNECT << 16, blk_rq_bytes(rq));
 		return 0;
 	}
 
 	if (lun->changed && !blk_pc_request(rq)) {
-		blkdev_dequeue_request(rq);
+		blk_start_request(rq);
 		ub_end_rq(rq, SAM_STAT_CHECK_CONDITION, blk_rq_bytes(rq));
 		return 0;
 	}
@@ -660,7 +660,7 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
 		return -1;
 	memset(cmd, 0, sizeof(struct ub_scsi_cmd));
 
-	blkdev_dequeue_request(rq);
+	blk_start_request(rq);
 
 	urq = &lun->urq;
 	memset(urq, 0, sizeof(struct ub_request));
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index 2086cb12d3e..390d69bb7c4 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -361,11 +361,9 @@ static void do_viodasd_request(struct request_queue *q)
 	 * back later.
 	 */
 	while (num_req_outstanding < VIOMAXREQ) {
-		req = elv_next_request(q);
+		req = blk_fetch_request(q);
 		if (req == NULL)
 			return;
-		/* dequeue the current request from the queue */
-		blkdev_dequeue_request(req);
 		/* check that request contains a valid command */
 		if (!blk_fs_request(req)) {
 			viodasd_end_request(req, -EIO, blk_rq_sectors(req));
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 1980ab45635..29a9daf4862 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -128,7 +128,7 @@ static void do_virtblk_request(struct request_queue *q)
 	struct request *req;
 	unsigned int issued = 0;
 
-	while ((req = elv_next_request(q)) != NULL) {
+	while ((req = blk_peek_request(q)) != NULL) {
 		vblk = req->rq_disk->private_data;
 		BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
 
@@ -138,7 +138,7 @@ static void do_virtblk_request(struct request_queue *q)
 			blk_stop_queue(q);
 			break;
 		}
-		blkdev_dequeue_request(req);
+		blk_start_request(req);
 		issued++;
 	}
 
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index d4c4352354b..ce242921992 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -305,10 +305,7 @@ static void do_xd_request (struct request_queue * q)
 	if (xdc_busy)
 		return;
 
-	req = elv_next_request(q);
-	if (req)
-		blkdev_dequeue_request(req);
-
+	req = blk_fetch_request(q);
 	while (req) {
 		unsigned block = blk_rq_pos(req);
 		unsigned count = blk_rq_cur_sectors(req);
@@ -325,11 +322,8 @@ static void do_xd_request (struct request_queue * q)
 					   block, count);
 	done:
 		/* wrap up, 0 = success, -errno = fail */
-		if (!__blk_end_request_cur(req, res)) {
-			req = elv_next_request(q);
-			if (req)
-				blkdev_dequeue_request(req);
-		}
+		if (!__blk_end_request_cur(req, res))
+			req = blk_fetch_request(q);
 	}
 }
 
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 66f834571b8..6d4ac76c280 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -299,13 +299,13 @@ static void do_blkif_request(struct request_queue *rq)
 
 	queued = 0;
 
-	while ((req = elv_next_request(rq)) != NULL) {
+	while ((req = blk_peek_request(rq)) != NULL) {
 		info = req->rq_disk->private_data;
 
 		if (RING_FULL(&info->ring))
 			goto wait;
 
-		blkdev_dequeue_request(req);
+		blk_start_request(req);
 
 		if (!blk_fs_request(req)) {
 			__blk_end_request_all(req, -EIO);
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index edf137b6c37..3a4397edab7 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -463,10 +463,10 @@ struct request *ace_get_next_request(struct request_queue * q)
 {
 	struct request *req;
 
-	while ((req = elv_next_request(q)) != NULL) {
+	while ((req = blk_peek_request(q)) != NULL) {
 		if (blk_fs_request(req))
 			break;
-		blkdev_dequeue_request(req);
+		blk_start_request(req);
 		__blk_end_request_all(req, -EIO);
 	}
 	return req;
@@ -498,10 +498,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
 			__blk_end_request_all(ace->req, -EIO);
 			ace->req = NULL;
 		}
-		while ((req = elv_next_request(ace->queue)) != NULL) {
-			blkdev_dequeue_request(req);
+		while ((req = blk_fetch_request(ace->queue)) != NULL)
 			__blk_end_request_all(req, -EIO);
-		}
 
 		/* Drop back to IDLE state and notify waiters */
 		ace->fsm_state = ACE_FSM_STATE_IDLE;
@@ -649,7 +647,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
 			ace->fsm_state = ACE_FSM_STATE_IDLE;
 			break;
 		}
-		blkdev_dequeue_request(req);
+		blk_start_request(req);
 
 		/* Okay, it's a data request, set it up for transfer */
 		dev_dbg(ace->dev,
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index c909c1a3f65..4575171e5be 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -71,10 +71,7 @@ static void do_z2_request(struct request_queue *q)
 {
 	struct request *req;
 
-	req = elv_next_request(q);
-	if (req)
-		blkdev_dequeue_request(req);
-
+	req = blk_fetch_request(q);
 	while (req) {
 		unsigned long start = blk_rq_pos(req) << 9;
 		unsigned long len  = blk_rq_cur_bytes(req);
@@ -100,11 +97,8 @@ static void do_z2_request(struct request_queue *q)
 			len -= size;
 		}
 	done:
-		if (!__blk_end_request_cur(req, err)) {
-			req = elv_next_request(q);
-			if (req)
-				blkdev_dequeue_request(req);
-		}
+		if (!__blk_end_request_cur(req, err))
+			req = blk_fetch_request(q);
 	}
 }
 
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index 3cc02bfe828..1e366ad8f68 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -642,9 +642,7 @@ static void gdrom_request(struct request_queue *rq)
 {
 	struct request *req;
 
-	while ((req = elv_next_request(rq)) != NULL) {
-		blkdev_dequeue_request(req);
-
+	while ((req = blk_fetch_request(rq)) != NULL) {
 		if (!blk_fs_request(req)) {
 			printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
 			__blk_end_request_all(req, -EIO);
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index bbe9f086734..ca741c21e4a 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -297,9 +297,7 @@ static void do_viocd_request(struct request_queue *q)
 {
 	struct request *req;
 
-	while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
-		blkdev_dequeue_request(req);
-
+	while ((rwreq == 0) && ((req = blk_fetch_request(q)) != NULL)) {
 		if (!blk_fs_request(req))
 			__blk_end_request_all(req, -EIO);
 		else if (send_request(req) < 0) {
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 2874c3d703a..8a894fa37b5 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -269,7 +269,7 @@ void ide_retry_pc(ide_drive_t *drive)
 	blk_requeue_request(failed_rq->q, failed_rq);
 	drive->hwif->rq = NULL;
 	if (ide_queue_sense_rq(drive, pc)) {
-		blkdev_dequeue_request(failed_rq);
+		blk_start_request(failed_rq);
 		ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));
 	}
 }
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index abda7337b3f..e4e3a0e3201 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -519,11 +519,8 @@ repeat:
 		 * we know that the queue isn't empty, but this can happen
 		 * if the q->prep_rq_fn() decides to kill a request
 		 */
-		if (!rq) {
-			rq = elv_next_request(drive->queue);
-			if (rq)
-				blkdev_dequeue_request(rq);
-		}
+		if (!rq)
+			rq = blk_fetch_request(drive->queue);
 
 		spin_unlock_irq(q->queue_lock);
 		spin_lock_irq(&hwif->lock);
@@ -536,7 +533,7 @@ repeat:
 		/*
 		 * Sanity: don't accept a request that isn't a PM request
 		 * if we are currently power managed. This is very important as
-		 * blk_stop_queue() doesn't prevent the elv_next_request()
+		 * blk_stop_queue() doesn't prevent the blk_fetch_request()
 		 * above to return us whatever is in the queue. Since we call
 		 * ide_do_request() ourselves, we end up taking requests while
 		 * the queue is blocked...
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 58f5be8cd69..c0bebc6a2f2 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -704,13 +704,12 @@ try_again:
 		return 0;
 	}
 
-	dev_dbg(&card->dev, "elv_next\n");
-	msb->block_req = elv_next_request(msb->queue);
+	dev_dbg(&card->dev, "blk_fetch\n");
+	msb->block_req = blk_fetch_request(msb->queue);
 	if (!msb->block_req) {
 		dev_dbg(&card->dev, "issue end\n");
 		return -EAGAIN;
 	}
-	blkdev_dequeue_request(msb->block_req);
 
 	dev_dbg(&card->dev, "trying again\n");
 	chunk = 1;
@@ -825,10 +824,8 @@ static void mspro_block_submit_req(struct request_queue *q)
 		return;
 
 	if (msb->eject) {
-		while ((req = elv_next_request(q)) != NULL) {
-			blkdev_dequeue_request(req);
+		while ((req = blk_fetch_request(q)) != NULL)
 			__blk_end_request_all(req, -ENODEV);
-		}
 
 		return;
 	}
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 8b5cbfc3ba9..6573ef4408f 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -877,7 +877,7 @@ static void i2o_block_request_fn(struct request_queue *q)
 	struct request *req;
 
 	while (!blk_queue_plugged(q)) {
-		req = elv_next_request(q);
+		req = blk_peek_request(q);
 		if (!req)
 			break;
 
@@ -890,7 +890,7 @@ static void i2o_block_request_fn(struct request_queue *q)
 
 			if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) {
 				if (!i2o_block_transfer(req)) {
-					blkdev_dequeue_request(req);
+					blk_start_request(req);
 					continue;
 				} else
 					osm_info("transfer error\n");
@@ -917,7 +917,7 @@ static void i2o_block_request_fn(struct request_queue *q)
 				break;
 			}
 		} else {
-			blkdev_dequeue_request(req);
+			blk_start_request(req);
 			__blk_end_request_all(req, -EIO);
 		}
 	}
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 4b70f1e2834..49e582356c6 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -54,11 +54,8 @@ static int mmc_queue_thread(void *d)
 
 		spin_lock_irq(q->queue_lock);
 		set_current_state(TASK_INTERRUPTIBLE);
-		if (!blk_queue_plugged(q)) {
-			req = elv_next_request(q);
-			if (req)
-				blkdev_dequeue_request(req);
-		}
+		if (!blk_queue_plugged(q))
+			req = blk_fetch_request(q);
 		mq->req = req;
 		spin_unlock_irq(q->queue_lock);
 
@@ -94,10 +91,8 @@ static void mmc_request(struct request_queue *q)
 
 	if (!mq) {
 		printk(KERN_ERR "MMC: killing requests for dead queue\n");
-		while ((req = elv_next_request(q)) != NULL) {
-			blkdev_dequeue_request(req);
+		while ((req = blk_fetch_request(q)) != NULL)
 			__blk_end_request_all(req, -EIO);
-		}
 		return;
 	}
 
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 3e10442615d..502622f628b 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -100,12 +100,7 @@ static int mtd_blktrans_thread(void *arg)
 		struct mtd_blktrans_dev *dev;
 		int res;
 
-		if (!req) {
-			req = elv_next_request(rq);
-			if (req)
-				blkdev_dequeue_request(req);
-		}
-		if (!req) {
+		if (!req && !(req = blk_fetch_request(rq))) {
 			set_current_state(TASK_INTERRUPTIBLE);
 			spin_unlock_irq(rq->queue_lock);
 			schedule();
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 7df03c7aea0..e64f62d5e0f 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1656,17 +1656,13 @@ static void __dasd_process_request_queue(struct dasd_block *block)
 	if (basedev->state < DASD_STATE_READY)
 		return;
 	/* Now we try to fetch requests from the request queue */
-	while (!blk_queue_plugged(queue) &&
-	       elv_next_request(queue)) {
-
-		req = elv_next_request(queue);
-
+	while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
 		if (basedev->features & DASD_FEATURE_READONLY &&
 		    rq_data_dir(req) == WRITE) {
 			DBF_DEV_EVENT(DBF_ERR, basedev,
 				      "Rejecting write request %p",
 				      req);
-			blkdev_dequeue_request(req);
+			blk_start_request(req);
 			__blk_end_request_all(req, -EIO);
 			continue;
 		}
@@ -1695,7 +1691,7 @@ static void __dasd_process_request_queue(struct dasd_block *block)
 				      "CCW creation failed (rc=%ld) "
 				      "on request %p",
 				      PTR_ERR(cqr), req);
-			blkdev_dequeue_request(req);
+			blk_start_request(req);
 			__blk_end_request_all(req, -EIO);
 			continue;
 		}
@@ -1705,7 +1701,7 @@ static void __dasd_process_request_queue(struct dasd_block *block)
 		 */
 		cqr->callback_data = (void *) req;
 		cqr->status = DASD_CQR_FILLED;
-		blkdev_dequeue_request(req);
+		blk_start_request(req);
 		list_add_tail(&cqr->blocklist, &block->ccw_queue);
 		dasd_profile_start(block, cqr, req);
 	}
@@ -2029,10 +2025,8 @@ static void dasd_flush_request_queue(struct dasd_block *block)
 		return;
 
 	spin_lock_irq(&block->request_queue_lock);
-	while ((req = elv_next_request(block->request_queue))) {
-		blkdev_dequeue_request(req);
+	while ((req = blk_fetch_request(block->request_queue)))
 		__blk_end_request_all(req, -EIO);
-	}
 	spin_unlock_irq(&block->request_queue_lock);
 }
 
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 5d035e4939d..1e796767598 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -93,7 +93,7 @@ __tapeblock_end_request(struct tape_request *ccw_req, void *data)
 		device->blk_data.block_position = -1;
 	device->discipline->free_bread(ccw_req);
 	if (!list_empty(&device->req_queue) ||
-	    elv_next_request(device->blk_data.request_queue))
+	    blk_peek_request(device->blk_data.request_queue))
 		tapeblock_trigger_requeue(device);
 }
 
@@ -162,19 +162,16 @@ tapeblock_requeue(struct work_struct *work) {
 	spin_lock_irq(&device->blk_data.request_queue_lock);
 	while (
 		!blk_queue_plugged(queue) &&
-		elv_next_request(queue)   &&
+		(req = blk_fetch_request(queue)) &&
 		nr_queued < TAPEBLOCK_MIN_REQUEUE
 	) {
-		req = elv_next_request(queue);
 		if (rq_data_dir(req) == WRITE) {
 			DBF_EVENT(1, "TBLOCK: Rejecting write request\n");
-			blkdev_dequeue_request(req);
 			spin_unlock_irq(&device->blk_data.request_queue_lock);
 			blk_end_request_all(req, -EIO);
 			spin_lock_irq(&device->blk_data.request_queue_lock);
 			continue;
 		}
-		blkdev_dequeue_request(req);
 		nr_queued++;
 		spin_unlock_irq(&device->blk_data.request_queue_lock);
 		rc = tapeblock_start_request(device, req);
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index f572a4a1d14..6d465168468 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -186,10 +186,7 @@ static void jsfd_do_request(struct request_queue *q)
 {
 	struct request *req;
 
-	req = elv_next_request(q);
-	if (req)
-		blkdev_dequeue_request(req);
-
+	req = blk_fetch_request(q);
 	while (req) {
 		struct jsfd_part *jdp = req->rq_disk->private_data;
 		unsigned long offset = blk_rq_pos(req) << 9;
@@ -212,11 +209,8 @@ static void jsfd_do_request(struct request_queue *q)
 		jsfd_read(req->buffer, jdp->dbase + offset, len);
 		err = 0;
 	end:
-		if (!__blk_end_request_cur(req, err)) {
-			req = elv_next_request(q);
-			if (req)
-				blkdev_dequeue_request(req);
-		}
+		if (!__blk_end_request_cur(req, err))
+			req = blk_fetch_request(q);
 	}
 }
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ee308f6f798..b12750f8216 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1207,7 +1207,7 @@ int scsi_prep_return(struct request_queue *q, struct request *req, int ret)
 		break;
 	case BLKPREP_DEFER:
 		/*
-		 * If we defer, the elv_next_request() returns NULL, but the
+		 * If we defer, the blk_peek_request() returns NULL, but the
 		 * queue must be restarted, so we plug here if no returning
 		 * command will automatically do that.
 		 */
@@ -1385,7 +1385,7 @@ static void scsi_kill_request(struct request *req, struct request_queue *q)
 	struct scsi_target *starget = scsi_target(sdev);
 	struct Scsi_Host *shost = sdev->host;
 
-	blkdev_dequeue_request(req);
+	blk_start_request(req);
 
 	if (unlikely(cmd == NULL)) {
 		printk(KERN_CRIT "impossible request in %s.\n",
@@ -1477,7 +1477,7 @@ static void scsi_request_fn(struct request_queue *q)
 
 	if (!sdev) {
 		printk("scsi: killing requests for dead queue\n");
-		while ((req = elv_next_request(q)) != NULL)
+		while ((req = blk_peek_request(q)) != NULL)
 			scsi_kill_request(req, q);
 		return;
 	}
@@ -1498,7 +1498,7 @@ static void scsi_request_fn(struct request_queue *q)
 		 * that the request is fully prepared even if we cannot 
 		 * accept it.
 		 */
-		req = elv_next_request(q);
+		req = blk_peek_request(q);
 		if (!req || !scsi_dev_queue_ready(q, sdev))
 			break;
 
@@ -1514,7 +1514,7 @@ static void scsi_request_fn(struct request_queue *q)
 		 * Remove the request from the request list.
 		 */
 		if (!(blk_queue_tagged(q) && !blk_queue_start_tag(q, req)))
-			blkdev_dequeue_request(req);
+			blk_start_request(req);
 		sdev->device_busy++;
 
 		spin_unlock(q->queue_lock);
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 50988cbf7b2..d606452297c 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -163,12 +163,10 @@ static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
 	int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
 
 	while (!blk_queue_plugged(q)) {
-		req = elv_next_request(q);
+		req = blk_fetch_request(q);
 		if (!req)
 			break;
 
-		blkdev_dequeue_request(req);
-
 		spin_unlock_irq(q->queue_lock);
 
 		handler = to_sas_internal(shost->transportt)->f->smp_handler;