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authorTejun Heo <tj@kernel.org>2009-04-23 06:05:18 +0400
committerJens Axboe <jens.axboe@oracle.com>2009-04-28 09:37:34 +0400
commit158dbda0068e63c7cce7bd47c123bd1dfa5a902c (patch)
tree2665f31350ba4f0875c7611c980b0831c22d8c98 /block/blk.h
parent5efccd17ceb0fc43837a331297c2c407969d7201 (diff)
downloadlinux-158dbda0068e63c7cce7bd47c123bd1dfa5a902c.tar.xz
block: reorganize request fetching functions
Impact: code reorganization elv_next_request() and elv_dequeue_request() are public block layer interface than actual elevator implementation. They mostly deal with how requests interact with block layer and low level drivers at the beginning of rqeuest processing whereas __elv_next_request() is the actual eleveator request fetching interface. Move the two functions to blk-core.c. This prepares for further interface cleanup. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'block/blk.h')
-rw-r--r--block/blk.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h
index 79c85f7c9ff5..9b2c324e4407 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -43,6 +43,43 @@ static inline void blk_clear_rq_complete(struct request *rq)
clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
}
+/*
+ * Internal elevator interface
+ */
+#define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash))
+
+static inline struct request *__elv_next_request(struct request_queue *q)
+{
+ struct request *rq;
+
+ while (1) {
+ while (!list_empty(&q->queue_head)) {
+ rq = list_entry_rq(q->queue_head.next);
+ if (blk_do_ordered(q, &rq))
+ return rq;
+ }
+
+ if (!q->elevator->ops->elevator_dispatch_fn(q, 0))
+ return NULL;
+ }
+}
+
+static inline void elv_activate_rq(struct request_queue *q, struct request *rq)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->ops->elevator_activate_req_fn)
+ e->ops->elevator_activate_req_fn(q, rq);
+}
+
+static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->ops->elevator_deactivate_req_fn)
+ e->ops->elevator_deactivate_req_fn(q, rq);
+}
+
#ifdef CONFIG_FAIL_IO_TIMEOUT
int blk_should_fake_timeout(struct request_queue *);
ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);