On 08/25/2010 06:47 PM, Tejun Heo wrote:
> Barrier is deemed too heavy and will soon be replaced by FLUSH/FUA
> requests. Deprecate barrier. All REQ_HARDBARRIERs are failed with
> -EOPNOTSUPP and blk_queue_ordered() is replaced with simpler
> blk_queue_flush().
>
> blk_queue_flush() takes combinations of REQ_FLUSH and FUA. If a
> device has write cache and can flush it, it should set REQ_FLUSH. If
> the device can handle FUA writes, it should also set REQ_FUA.
>
> All blk_queue_ordered() users are converted.
>
> * ORDERED_DRAIN is mapped to 0 which is the default value.
> * ORDERED_DRAIN_FLUSH is mapped to REQ_FLUSH.
> * ORDERED_DRAIN_FLUSH_FUA is mapped to REQ_FLUSH | REQ_FUA.
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> Cc: Nick Piggin <npiggin@xxxxxxxxx>
> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
> Cc: Chris Wright <chrisw@xxxxxxxxxxxx>
> Cc: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
> Cc: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
Acked-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
Actually osd as support for FUA as well. It's on my todo
to implement it.
Thanks Tejun, as usual, after your visit there is more room
in the house.
> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@xxxxxxxxxxx>
> Cc: David S. Miller <davem@xxxxxxxxxxxxx>
> Cc: Alasdair G Kergon <agk@xxxxxxxxxx>
> Cc: Pierre Ossman <drzeus@xxxxxxxxx>
> Cc: Stefan Weinhuber <wein@xxxxxxxxxx>
> ---
<snip>
> drivers/block/osdblk.c | 2 +-
> diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
> index 2284b4f..72d6246 100644
> --- a/drivers/block/osdblk.c
> +++ b/drivers/block/osdblk.c
> @@ -439,7 +439,7 @@ static int osdblk_init_disk(struct osdblk_device *osdev)
> blk_queue_stack_limits(q, osd_request_queue(osdev->osd));
>
> blk_queue_prep_rq(q, blk_queue_start_tag);
> - blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH);
> + blk_queue_flush(q, REQ_FLUSH);
>
> disk->queue = q;
>
<snip>
Also this mail
On 08/25/2010 06:47 PM, Tejun Heo wrote:
> REQ_HARDBARRIER is deprecated. Remove spurious uses in the following
> users. Please note that other than osdblk, all other uses were
> already spurious before deprecation.
>
> * osdblk: osdblk_rq_fn() won't receive any request with
> REQ_HARDBARRIER set. Remove the test for it.
>
> * pktcdvd: use of REQ_HARDBARRIER in pkt_generic_packet() doesn't mean
> anything. Removed.
>
> * aic7xxx_old: Setting MSG_ORDERED_Q_TAG on REQ_HARDBARRIER is
> spurious. Removed.
>
> * sas_scsi_host: Setting TASK_ATTR_ORDERED on REQ_HARDBARRIER is
> spurious. Removed.
>
> * scsi_tcq: The ordered tag path wasn't being used anyway. Removed.
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
Acked-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
> Cc: James Bottomley <James.Bottomley@xxxxxxx>
> Cc: Peter Osterlund <petero2@xxxxxxxxx>
> ---
> drivers/block/osdblk.c | 3 +--
<snip>
> diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
> index 72d6246..87311eb 100644
> --- a/drivers/block/osdblk.c
> +++ b/drivers/block/osdblk.c
> @@ -310,8 +310,7 @@ static void osdblk_rq_fn(struct request_queue *q)
> break;
>
> /* filter out block requests we don't understand */
> - if (rq->cmd_type != REQ_TYPE_FS &&
> - !(rq->cmd_flags & REQ_HARDBARRIER)) {
> + if (rq->cmd_type != REQ_TYPE_FS) {
> blk_end_request_all(rq, 0);
> continue;
> }
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