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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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17
include/linux/blkdev.h
View file

@ -470,12 +470,7 @@ enum {
* DRAIN : ordering by draining is enough
* DRAIN_FLUSH : ordering by draining w/ pre and post flushes
* DRAIN_FUA : ordering by draining w/ pre flush and FUA write
* TAG : ordering by tag is enough
* TAG_FLUSH : ordering by tag w/ pre and post flushes
* TAG_FUA : ordering by tag w/ pre flush and FUA write
*/
QUEUE_ORDERED_BY_DRAIN = 0x01,
QUEUE_ORDERED_BY_TAG = 0x02,
QUEUE_ORDERED_DO_PREFLUSH = 0x10,
QUEUE_ORDERED_DO_BAR = 0x20,
QUEUE_ORDERED_DO_POSTFLUSH = 0x40,
@ -483,8 +478,7 @@ enum {
QUEUE_ORDERED_NONE = 0x00,
QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN |
QUEUE_ORDERED_DO_BAR,
QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_DO_BAR,
QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN |
QUEUE_ORDERED_DO_PREFLUSH |
QUEUE_ORDERED_DO_POSTFLUSH,
@ -492,15 +486,6 @@ enum {
QUEUE_ORDERED_DO_PREFLUSH |
QUEUE_ORDERED_DO_FUA,
QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG |
QUEUE_ORDERED_DO_BAR,
QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG |
QUEUE_ORDERED_DO_PREFLUSH |
QUEUE_ORDERED_DO_POSTFLUSH,
QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG |
QUEUE_ORDERED_DO_PREFLUSH |
QUEUE_ORDERED_DO_FUA,
/*
* Ordered operation sequence
*/