Prev: [PATCH 1/9] block: introduce REQ_FLUSH flag
Next: remove q->prepare_flush_fn hook
From: FUJITA Tomonori on 3 Jul 2010 04:50
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(a)lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley(a)suse.de>
---
drivers/scsi/sd.c | 26 ++++++++++++++++----------
1 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index aa6b48b..e8c295e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -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);
--
1.6.5

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Prev: [PATCH 1/9] block: introduce REQ_FLUSH flag
Next: remove q->prepare_flush_fn hook