aboutsummaryrefslogtreecommitdiffstats
path: root/block/ll_rw_blk.c
diff options
context:
space:
mode:
authorJens Axboe <axboe@suse.de>2006-07-28 09:23:08 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-09-30 20:26:56 +0200
commit9817064b68fef7e4580c6df1ea597e106b9ff88b (patch)
tree76c27990626247613e9efa45b792d51ad79635d7 /block/ll_rw_blk.c
parent4aff5e2333c9a1609662f2091f55c3f6fffdad36 (diff)
downloadmrst-s0i3-test-9817064b68fef7e4580c6df1ea597e106b9ff88b.tar.gz
mrst-s0i3-test-9817064b68fef7e4580c6df1ea597e106b9ff88b.tar.xz
mrst-s0i3-test-9817064b68fef7e4580c6df1ea597e106b9ff88b.zip
[PATCH] elevator: move the backmerging logic into the elevator core
Right now, every IO scheduler implements its own backmerging (except for noop, which does no merging). That results in duplicated code for essentially the same operation, which is never a good thing. This patch moves the backmerging out of the io schedulers and into the elevator core. We save 1.6kb of text and as a bonus get backmerging for noop as well. Win-win! Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/ll_rw_blk.c')
-rw-r--r--block/ll_rw_blk.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 9b91bb70c5e..9cbf7b550c7 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -281,6 +281,7 @@ static inline void rq_init(request_queue_t *q, struct request *rq)
{
INIT_LIST_HEAD(&rq->queuelist);
INIT_LIST_HEAD(&rq->donelist);
+ INIT_HLIST_NODE(&rq->hash);
rq->errors = 0;
rq->rq_status = RQ_ACTIVE;
@@ -2700,6 +2701,7 @@ void __blk_put_request(request_queue_t *q, struct request *req)
int priv = req->cmd_flags & REQ_ELVPRIV;
BUG_ON(!list_empty(&req->queuelist));
+ BUG_ON(!hlist_unhashed(&req->hash));
blk_free_request(q, req);
freed_request(q, rw, priv);