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block: kill QUEUE_ORDERED_BY_TAG

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Nobody is making meaningful use of ORDERED_BY_TAG now and queue
draining for barrier requests will be removed soon which will render
the advantage of tag ordering moot.  Kill ORDERED_BY_TAG.  The
following users are affected.

* brd: converted to ORDERED_DRAIN.
* virtio_blk: ORDERED_TAG path was already marked deprecated.  Removed.
* xen-blkfront: ORDERED_TAG case dropped.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Tejun Heo
2010-09-03 11:56:16 +02:00
committed by Jens Axboe
parent 589d7ed02a
commit 6958f14545
6 changed files with 13 additions and 62 deletions
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4
drivers/scsi/sd.c
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@@ -2151,9 +2151,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
/*
* 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.
* with ordered requests.
*/
if (sdkp->WCE)
ordered = sdkp->DPOFUA