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| author | NeilBrown <neilb@suse.de> | 2009-06-30 09:35:44 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-07-01 10:56:26 +0200 |
| commit | db64f680ba4b5c56c4be59f0698000df89ff0281 (patch) | |
| tree | f094e64952ba746525e4695256a70e0d32553065 | |
| parent | 018e0446890661504783f92388ecce7138c1566d (diff) | |
| download | lwn-db64f680ba4b5c56c4be59f0698000df89ff0281.tar.gz lwn-db64f680ba4b5c56c4be59f0698000df89ff0281.zip | |
blocK: Restore barrier support for md and probably other virtual devices.
The next_ordered flag is only meaningful for devices that use __make_request.
So move the test against next_ordered out of generic code and in to
__make_request
Since this test was added, barriers have not worked on md or any
devices that don't use __make_request and so don't bother to set
next_ordered. (dm explicitly sets something other than
QUEUE_ORDERED_NONE since
commit 99360b4c18f7675b50d283301d46d755affe75fd
but notes in the comments that it is otherwise meaningless).
Cc: Ken Milmore <ken.milmore@googlemail.com>
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/blk-core.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 02b87134a167..4b45435c6eaf 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1170,6 +1170,11 @@ static int __make_request(struct request_queue *q, struct bio *bio) const int unplug = bio_unplug(bio); int rw_flags; + if (bio_barrier(bio) && bio_has_data(bio) && + (q->next_ordered == QUEUE_ORDERED_NONE)) { + 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 @@ -1470,11 +1475,6 @@ static inline void __generic_make_request(struct bio *bio) err = -EOPNOTSUPP; goto end_io; } - if (bio_barrier(bio) && bio_has_data(bio) && - (q->next_ordered == QUEUE_ORDERED_NONE)) { - err = -EOPNOTSUPP; - goto end_io; - } ret = q->make_request_fn(q, bio); } while (ret); |