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| author | Tejun Heo <tj@kernel.org> | 2010-09-03 11:56:16 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-09-10 12:35:36 +0200 |
| commit | 4913efe456c987057e5d36a3f0a55422a9072cae (patch) | |
| tree | 295f04a7214e1933df3301dd42c12ff3f282a22c /block/blk-core.c | |
| parent | 6958f145459ca7ad9715024de97445addacb8510 (diff) | |
| download | lwn-4913efe456c987057e5d36a3f0a55422a9072cae.tar.gz lwn-4913efe456c987057e5d36a3f0a55422a9072cae.zip | |
block: deprecate barrier and replace blk_queue_ordered() with blk_queue_flush()
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@kernel.org>
Acked-by: Boaz Harrosh <bharrosh@panasas.com>
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>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Cc: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index ee1a1e7e63cc..f06354183b29 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1203,11 +1203,13 @@ static int __make_request(struct request_queue *q, struct bio *bio) const unsigned int ff = bio->bi_rw & REQ_FAILFAST_MASK; int rw_flags; - if ((bio->bi_rw & REQ_HARDBARRIER) && - (q->next_ordered == QUEUE_ORDERED_NONE)) { + /* REQ_HARDBARRIER is no more */ + if (WARN_ONCE(bio->bi_rw & REQ_HARDBARRIER, + "block: HARDBARRIER is deprecated, use FLUSH/FUA instead\n")) { bio_endio(bio, -EOPNOTSUPP); return 0; } + /* * low level driver can indicate that it wants pages above a * certain limit bounced to low memory (ie for highmem, or even |