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scsi: stop using q->prepare_flush_fn

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scsi-ml builds flush requests via q->prepare_flush_fn(), however,
builds discard requests via q->prep_rq_fn.

Using two different mechnisms for the similar requests (building
commands in SCSI ULD) doesn't make sense.

Handing both via q->prep_rq_fn makes the code design simpler.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
FUJITA Tomonori 2010-07-03 17:45:34 +09:00 committed by Jens Axboe
parent b6a903151d
commit 90467c294a
1 changed files with 16 additions and 10 deletions
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26
drivers/scsi/sd.c
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@ -471,6 +471,18 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
return ret;
}
static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
{
/* for now, we use REQ_TYPE_BLOCK_PC. */
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = SD_TIMEOUT;
rq->retries = SD_MAX_RETRIES;
rq->cmd[0] = SYNCHRONIZE_CACHE;
rq->cmd_len = 10;
return scsi_setup_blk_pc_cmnd(sdp, rq);
}
static void sd_unprep_fn(struct request_queue *q, struct request *rq)
{
if (rq->cmd_flags & REQ_DISCARD)
@ -504,6 +516,9 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
if (rq->cmd_flags & REQ_DISCARD) {
ret = scsi_setup_discard_cmnd(sdp, rq);
goto out;
} else if (rq->cmd_flags & REQ_FLUSH) {
ret = scsi_setup_flush_cmnd(sdp, rq);
goto out;
} else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
goto out;
@ -1053,15 +1068,6 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
return 0;
}
static void sd_prepare_flush(struct request_queue *q, struct request *rq)
{
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = SD_TIMEOUT;
rq->retries = SD_MAX_RETRIES;
rq->cmd[0] = SYNCHRONIZE_CACHE;
rq->cmd_len = 10;
}
static void sd_rescan(struct device *dev)
{
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
@ -2129,7 +2135,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
else
ordered = QUEUE_ORDERED_DRAIN;
blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
blk_queue_ordered(sdkp->disk->queue, ordered, NULL);
set_capacity(disk, sdkp->capacity);
kfree(buffer);