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block: deprecate barrier and replace blk_queue_ordered() with blk_queue_flush()

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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 <[email protected]>
Acked-by: Boaz Harrosh <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Chris Wright <[email protected]>
Cc: FUJITA Tomonori <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Alasdair G Kergon <[email protected]>
Cc: Pierre Ossman <[email protected]>
Cc: Stefan Weinhuber <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2010-09-03 11:56:16 +02:00 • committed by Jens Axboe
commit 4913efe456
15 changed files with 67 additions and 102 deletions
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2
drivers/md/dm.c
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@ -2245,7 +2245,7 @@ static int dm_init_request_based_queue(struct mapped_device *md)
blk_queue_softirq_done(md->queue, dm_softirq_done);
blk_queue_prep_rq(md->queue, dm_prep_fn);
blk_queue_lld_busy(md->queue, dm_lld_busy);
blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN_FLUSH);
blk_queue_flush(md->queue, REQ_FLUSH);
elv_register_queue(md->queue);