From 461d4e90c8cd049718884cd17c955e231140d3be Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 6 Jan 2006 09:52:55 +0100 Subject: [BLOCK] update SCSI to use new blk_ordered for barriers All ordered request related stuff delegated to HLD. Midlayer now doens't deal with ordered setting or prepare_flush callback. sd.c updated to deal with blk_queue_ordered setting. Currently, ordered tag isn't used as SCSI midlayer cannot guarantee request ordering. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- drivers/scsi/sd.c | 58 +++++++++++++++++++------------------------------------ 1 file changed, 20 insertions(+), 38 deletions(-) (limited to 'drivers/scsi/sd.c') diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index d651150ee76d..2eefc9eb5da6 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -121,8 +121,7 @@ static void sd_shutdown(struct device *dev); static void sd_rescan(struct device *); static int sd_init_command(struct scsi_cmnd *); static int sd_issue_flush(struct device *, sector_t *); -static void sd_end_flush(request_queue_t *, struct request *); -static int sd_prepare_flush(request_queue_t *, struct request *); +static void sd_prepare_flush(request_queue_t *, struct request *); static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname, unsigned char *buffer); @@ -137,8 +136,6 @@ static struct scsi_driver sd_template = { .rescan = sd_rescan, .init_command = sd_init_command, .issue_flush = sd_issue_flush, - .prepare_flush = sd_prepare_flush, - .end_flush = sd_end_flush, }; /* @@ -729,42 +726,13 @@ static int sd_issue_flush(struct device *dev, sector_t *error_sector) return ret; } -static void sd_end_flush(request_queue_t *q, struct request *flush_rq) +static void sd_prepare_flush(request_queue_t *q, struct request *rq) { - struct request *rq = flush_rq->end_io_data; - struct scsi_cmnd *cmd = rq->special; - unsigned int bytes = rq->hard_nr_sectors << 9; - - if (!flush_rq->errors) { - spin_unlock(q->queue_lock); - scsi_io_completion(cmd, bytes, 0); - spin_lock(q->queue_lock); - } else if (blk_barrier_postflush(rq)) { - spin_unlock(q->queue_lock); - scsi_io_completion(cmd, 0, bytes); - spin_lock(q->queue_lock); - } else { - /* - * force journal abort of barriers - */ - end_that_request_first(rq, -EOPNOTSUPP, rq->hard_nr_sectors); - end_that_request_last(rq, -EOPNOTSUPP); - } -} - -static int sd_prepare_flush(request_queue_t *q, struct request *rq) -{ - struct scsi_device *sdev = q->queuedata; - struct scsi_disk *sdkp = dev_get_drvdata(&sdev->sdev_gendev); - - if (!sdkp || !sdkp->WCE) - return 0; - memset(rq->cmd, 0, sizeof(rq->cmd)); - rq->flags |= REQ_BLOCK_PC | REQ_SOFTBARRIER; + rq->flags |= REQ_BLOCK_PC; rq->timeout = SD_TIMEOUT; rq->cmd[0] = SYNCHRONIZE_CACHE; - return 1; + rq->cmd_len = 10; } static void sd_rescan(struct device *dev) @@ -1462,6 +1430,7 @@ static int sd_revalidate_disk(struct gendisk *disk) struct scsi_disk *sdkp = scsi_disk(disk); struct scsi_device *sdp = sdkp->device; unsigned char *buffer; + unsigned ordered; SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name)); @@ -1498,7 +1467,20 @@ static int sd_revalidate_disk(struct gendisk *disk) sd_read_write_protect_flag(sdkp, disk->disk_name, buffer); sd_read_cache_type(sdkp, disk->disk_name, buffer); } - + + /* + * We now have all cache related info, determine how we deal + * with ordered requests. Note that as the current SCSI + * dispatch function can alter request order, we cannot use + * QUEUE_ORDERED_TAG_* even when ordered tag is supported. + */ + if (sdkp->WCE) + ordered = QUEUE_ORDERED_DRAIN_FLUSH; + else + ordered = QUEUE_ORDERED_DRAIN; + + blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); + set_capacity(disk, sdkp->capacity); kfree(buffer); @@ -1598,6 +1580,7 @@ static int sd_probe(struct device *dev) strcpy(gd->devfs_name, sdp->devfs_name); gd->private_data = &sdkp->driver; + gd->queue = sdkp->device->request_queue; sd_revalidate_disk(gd); @@ -1605,7 +1588,6 @@ static int sd_probe(struct device *dev) gd->flags = GENHD_FL_DRIVERFS; if (sdp->removable) gd->flags |= GENHD_FL_REMOVABLE; - gd->queue = sdkp->device->request_queue; dev_set_drvdata(dev, sdkp); add_disk(gd); -- cgit v1.2.3-59-g8ed1b