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authorTejun Heo <tj@kernel.org>2010-09-03 11:56:16 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-09-10 12:35:36 +0200
commitdd831006d5be7f74c3fe7aef82380c51c3637960 (patch)
tree30a86749f0c4f7980b2982dbde8bbcfff37b08f9 /block/blk.h
parent9cbbdca44ae1a6f512ea1e2be11ced8bbb9d430a (diff)
downloadop-kernel-dev-dd831006d5be7f74c3fe7aef82380c51c3637960.zip
op-kernel-dev-dd831006d5be7f74c3fe7aef82380c51c3637960.tar.gz
block: misc cleanups in barrier code
Make the following cleanups in preparation of barrier/flush update. * blk_do_ordered() declaration is moved from include/linux/blkdev.h to block/blk.h. * blk_do_ordered() now returns pointer to struct request, with %NULL meaning "try the next request" and ERR_PTR(-EAGAIN) "try again later". The third case will be dropped with further changes. * In the initialization of proxy barrier request, data direction is already set by init_request_from_bio(). Drop unnecessary explicit REQ_WRITE setting and move init_request_from_bio() above REQ_FUA flag setting. * add_request() is collapsed into __make_request(). These changes don't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk.h')
-rw-r--r--block/blk.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/block/blk.h b/block/blk.h
index 6e7dc87..874eb4e 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -51,6 +51,8 @@ static inline void blk_clear_rq_complete(struct request *rq)
*/
#define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash))
+struct request *blk_do_ordered(struct request_queue *q, struct request *rq);
+
static inline struct request *__elv_next_request(struct request_queue *q)
{
struct request *rq;
@@ -58,8 +60,9 @@ static inline struct request *__elv_next_request(struct request_queue *q)
while (1) {
while (!list_empty(&q->queue_head)) {
rq = list_entry_rq(q->queue_head.next);
- if (blk_do_ordered(q, &rq))
- return rq;
+ rq = blk_do_ordered(q, rq);
+ if (rq)
+ return !IS_ERR(rq) ? rq : NULL;
}
if (!q->elevator->ops->elevator_dispatch_fn(q, 0))
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