block: implement and use [__]blk_end_request_all() There are many [__]blk_end_request() call sites which call it with full request length and expect full completion. Many of them ensure that the request actually completes by doing BUG_ON() the return value, which is awkward and error-prone. This patch adds [__]blk_end_request_all() which takes @rq and @error and fully completes the request. BUG_ON() is added to to ensure that this actually happens. Most conversions are simple but there are a few noteworthy ones. * cdrom/viocd: viocd_end_request() replaced with direct calls to __blk_end_request_all(). * s390/block/dasd: dasd_end_request() replaced with direct calls to __blk_end_request_all(). * s390/char/tape_block: tapeblock_end_request() replaced with direct calls to blk_end_request_all(). [ Impact: cleanup ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Mike Miller <mike.miller@hp.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c index 0abfbaa..cf81bad 100644 --- a/arch/arm/plat-omap/mailbox.c +++ b/arch/arm/plat-omap/mailbox.c
@@ -192,8 +192,7 @@ } spin_lock(q->queue_lock); - if (__blk_end_request(rq, 0, 0)) - BUG(); + __blk_end_request_all(rq, 0); spin_unlock(q->queue_lock); } } @@ -224,10 +223,7 @@ break; msg = (mbox_msg_t) rq->data; - - if (blk_end_request(rq, 0, 0)) - BUG(); - + blk_end_request_all(rq, 0); mbox->rxq->callback((void *)msg); } } @@ -337,8 +333,7 @@ *p = (mbox_msg_t) rq->data; - if (blk_end_request(rq, 0, 0)) - BUG(); + blk_end_request_all(rq, 0); if (unlikely(mbox_seq_test(mbox, *p))) { pr_info("mbox: Illegal seq bit!(%08x) ignored\n", *p);
diff --git a/block/blk-barrier.c b/block/blk-barrier.c index 20b4111..c8d0876 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c
@@ -106,10 +106,7 @@ */ q->ordseq = 0; rq = q->orig_bar_rq; - - if (__blk_end_request(rq, q->orderr, blk_rq_bytes(rq))) - BUG(); - + __blk_end_request_all(rq, q->orderr); return true; } @@ -252,9 +249,7 @@ * with prejudice. */ elv_dequeue_request(q, rq); - if (__blk_end_request(rq, -EOPNOTSUPP, - blk_rq_bytes(rq))) - BUG(); + __blk_end_request_all(rq, -EOPNOTSUPP); *rqp = NULL; return false; }
diff --git a/block/blk-core.c b/block/blk-core.c index b84250d..0520cc7 100644 --- a/block/blk-core.c +++ b/block/blk-core.c
@@ -1780,7 +1780,7 @@ break; } else if (ret == BLKPREP_KILL) { rq->cmd_flags |= REQ_QUIET; - __blk_end_request(rq, -EIO, blk_rq_bytes(rq)); + __blk_end_request_all(rq, -EIO); } else { printk(KERN_ERR "%s: bad return=%d\n", __func__, ret); break;
diff --git a/block/elevator.c b/block/elevator.c index b03b8752..1af5d9f 100644 --- a/block/elevator.c +++ b/block/elevator.c
@@ -810,7 +810,7 @@ rq = list_entry_rq(q->queue_head.next); rq->cmd_flags |= REQ_QUIET; trace_block_rq_abort(q, rq); - __blk_end_request(rq, -EIO, blk_rq_bytes(rq)); + __blk_end_request_all(rq, -EIO); } } EXPORT_SYMBOL(elv_abort_queue);
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c index ca268ca..488a8f4 100644 --- a/drivers/block/cpqarray.c +++ b/drivers/block/cpqarray.c
@@ -1024,8 +1024,7 @@ cmd->req.sg[i].size, ddir); DBGPX(printk("Done with %p\n", rq);); - if (__blk_end_request(rq, error, blk_rq_bytes(rq))) - BUG(); + __blk_end_request_all(rq, error); } /*
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c index ff0448e..60e85bb 100644 --- a/drivers/block/sx8.c +++ b/drivers/block/sx8.c
@@ -749,8 +749,7 @@ struct request *req = crq->rq; int rc; - rc = __blk_end_request(req, error, blk_rq_bytes(req)); - assert(rc == 0); + __blk_end_request_all(req, error); rc = carm_put_request(host, crq); assert(rc == 0);
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 5d34764..50745e6 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c
@@ -62,7 +62,7 @@ break; } - __blk_end_request(vbr->req, error, blk_rq_bytes(vbr->req)); + __blk_end_request_all(vbr->req, error); list_del(&vbr->list); mempool_free(vbr, vblk->pool); }
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 8f90508..cd6cfe3 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c
@@ -551,7 +551,6 @@ for (i = info->ring.rsp_cons; i != rp; i++) { unsigned long id; - int ret; bret = RING_GET_RESPONSE(&info->ring, i); id = bret->id; @@ -578,8 +577,7 @@ dev_dbg(&info->xbdev->dev, "Bad return from blkdev data " "request: %x\n", bret->status); - ret = __blk_end_request(req, error, blk_rq_bytes(req)); - BUG_ON(ret); + __blk_end_request_all(req, error); break; default: BUG();
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c index 2eecb77..fee9a9e 100644 --- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c
@@ -632,7 +632,7 @@ * before handling ending the request */ spin_lock(&gdrom_lock); list_del_init(&req->queuelist); - __blk_end_request(req, err, blk_rq_bytes(req)); + __blk_end_request_all(req, err); } spin_unlock(&gdrom_lock); kfree(read_command);
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c index 1392935..cc3efa0 100644 --- a/drivers/cdrom/viocd.c +++ b/drivers/cdrom/viocd.c
@@ -291,23 +291,6 @@ return 0; } -static void viocd_end_request(struct request *req, int error) -{ - int nsectors = req->hard_nr_sectors; - - /* - * Make sure it's fully ended, and ensure that we process - * at least one sector. - */ - if (blk_pc_request(req)) - nsectors = (req->data_len + 511) >> 9; - if (!nsectors) - nsectors = 1; - - if (__blk_end_request(req, error, nsectors << 9)) - BUG(); -} - static int rwreq; static void do_viocd_request(struct request_queue *q) @@ -316,11 +299,11 @@ while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) { if (!blk_fs_request(req)) - viocd_end_request(req, -EIO); + __blk_end_request_all(req, -EIO); else if (send_request(req) < 0) { printk(VIOCD_KERN_WARNING "unable to send message to OS/400!"); - viocd_end_request(req, -EIO); + __blk_end_request_all(req, -EIO); } else rwreq++; } @@ -531,9 +514,9 @@ "with rc %d:0x%04X: %s\n", req, event->xRc, bevent->sub_result, err->msg); - viocd_end_request(req, -EIO); + __blk_end_request_all(req, -EIO); } else - viocd_end_request(req, 0); + __blk_end_request_all(req, 0); /* restart handling of incoming requests */ spin_unlock_irqrestore(&viocd_reqlock, flags);
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c index de143de..a416346 100644 --- a/drivers/memstick/core/mspro_block.c +++ b/drivers/memstick/core/mspro_block.c
@@ -826,7 +826,7 @@ if (msb->eject) { while ((req = elv_next_request(q)) != NULL) - __blk_end_request(req, -ENODEV, blk_rq_bytes(req)); + __blk_end_request_all(req, -ENODEV); return; }
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index d181527..fabec95 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c
@@ -1614,15 +1614,6 @@ } /* - * posts the buffer_cache about a finalized request - */ -static inline void dasd_end_request(struct request *req, int error) -{ - if (__blk_end_request(req, error, blk_rq_bytes(req))) - BUG(); -} - -/* * Process finished error recovery ccw. */ static inline void __dasd_block_process_erp(struct dasd_block *block, @@ -1676,7 +1667,7 @@ "Rejecting write request %p", req); blkdev_dequeue_request(req); - dasd_end_request(req, -EIO); + __blk_end_request_all(req, -EIO); continue; } cqr = basedev->discipline->build_cp(basedev, block, req); @@ -1705,7 +1696,7 @@ "on request %p", PTR_ERR(cqr), req); blkdev_dequeue_request(req); - dasd_end_request(req, -EIO); + __blk_end_request_all(req, -EIO); continue; } /* @@ -1731,7 +1722,7 @@ status = cqr->block->base->discipline->free_cp(cqr, req); if (status <= 0) error = status ? status : -EIO; - dasd_end_request(req, error); + __blk_end_request_all(req, error); } /* @@ -2040,7 +2031,7 @@ spin_lock_irq(&block->request_queue_lock); while ((req = elv_next_request(block->request_queue))) { blkdev_dequeue_request(req); - dasd_end_request(req, -EIO); + __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 f32e89e..86596d3 100644 --- a/drivers/s390/char/tape_block.c +++ b/drivers/s390/char/tape_block.c
@@ -74,13 +74,6 @@ * Post finished request. */ static void -tapeblock_end_request(struct request *req, int error) -{ - if (blk_end_request(req, error, blk_rq_bytes(req))) - BUG(); -} - -static void __tapeblock_end_request(struct tape_request *ccw_req, void *data) { struct tape_device *device; @@ -90,7 +83,7 @@ device = ccw_req->device; req = (struct request *) data; - tapeblock_end_request(req, (ccw_req->rc == 0) ? 0 : -EIO); + blk_end_request_all(req, (ccw_req->rc == 0) ? 0 : -EIO); if (ccw_req->rc == 0) /* Update position. */ device->blk_data.block_position = @@ -118,7 +111,7 @@ ccw_req = device->discipline->bread(device, req); if (IS_ERR(ccw_req)) { DBF_EVENT(1, "TBLOCK: bread failed\n"); - tapeblock_end_request(req, -EIO); + blk_end_request_all(req, -EIO); return PTR_ERR(ccw_req); } ccw_req->callback = __tapeblock_end_request; @@ -131,7 +124,7 @@ * Start/enqueueing failed. No retries in * this case. */ - tapeblock_end_request(req, -EIO); + blk_end_request_all(req, -EIO); device->discipline->free_bread(ccw_req); } @@ -177,7 +170,7 @@ DBF_EVENT(1, "TBLOCK: Rejecting write request\n"); blkdev_dequeue_request(req); spin_unlock_irq(&device->blk_data.request_queue_lock); - tapeblock_end_request(req, -EIO); + blk_end_request_all(req, -EIO); spin_lock_irq(&device->blk_data.request_queue_lock); continue; }
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index d1cb64a..756ac7c 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c
@@ -922,7 +922,7 @@ if (driver_byte(result) & DRIVER_SENSE) scsi_print_sense("", cmd); } - blk_end_request(req, -EIO, blk_rq_bytes(req)); + blk_end_request_all(req, -EIO); scsi_next_command(cmd); break; case ACTION_REPREP:
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 501f684..e33c835 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h
@@ -883,6 +883,22 @@ } /** + * blk_end_request_all - Helper function for drives to finish the request. + * @rq: the request to finish + * @err: %0 for success, < %0 for error + * + * Description: + * Completely finish @rq. + */ +static inline void blk_end_request_all(struct request *rq, int error) +{ + bool pending; + + pending = blk_end_request(rq, error, blk_rq_bytes(rq)); + BUG_ON(pending); +} + +/** * __blk_end_request - Helper function for drivers to complete the request. * @rq: the request being processed * @error: %0 for success, < %0 for error @@ -902,6 +918,22 @@ } /** + * __blk_end_request_all - Helper function for drives to finish the request. + * @rq: the request to finish + * @err: %0 for success, < %0 for error + * + * Description: + * Completely finish @rq. Must be called with queue lock held. + */ +static inline void __blk_end_request_all(struct request *rq, int error) +{ + bool pending; + + pending = __blk_end_request(rq, error, blk_rq_bytes(rq)); + BUG_ON(pending); +} + +/** * end_request - end I/O on the current segment of the request * @rq: the request being processed * @uptodate: error value or %0/%1 uptodate flag