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authorNeilBrown <neilb@suse.de>2009-06-30 09:35:44 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-07-01 10:56:26 +0200
commitdb64f680ba4b5c56c4be59f0698000df89ff0281 (patch)
treef094e64952ba746525e4695256a70e0d32553065 /block/blk-core.c
parent018e0446890661504783f92388ecce7138c1566d (diff)
downloadlinux-2.6.34-ux500-db64f680ba4b5c56c4be59f0698000df89ff0281.tar.gz
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>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 02b87134a16..4b45435c6ea 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);