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Subject[PATCH 5/7] iosched: introduce elv_kick_page()
Introduce elv_kick_page() to turn a possibly READA request into READ.
The underlying elevator_kick_page_fn() should also reschedule the request
if necessary.

Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
---

block/ll_rw_blk.c | 8 ++++++++
fs/buffer.c | 5 +++--
include/linux/elevator.h | 2 ++
3 files changed, 13 insertions(+), 2 deletions(-)
--- linux-2.6.17-rc5-mm3.orig/include/linux/elevator.h
+++ linux-2.6.17-rc5-mm3/include/linux/elevator.h
@@ -20,6 +20,7 @@ typedef int (elevator_set_req_fn) (reque
typedef void (elevator_put_req_fn) (request_queue_t *, struct request *);
typedef void (elevator_activate_req_fn) (request_queue_t *, struct request *);
typedef void (elevator_deactivate_req_fn) (request_queue_t *, struct request *);
+typedef int (elevator_kick_page_fn) (request_queue_t *, struct page *);

typedef int (elevator_init_fn) (request_queue_t *, elevator_t *);
typedef void (elevator_exit_fn) (elevator_t *);
@@ -34,6 +35,7 @@ struct elevator_ops
elevator_add_req_fn *elevator_add_req_fn;
elevator_activate_req_fn *elevator_activate_req_fn;
elevator_deactivate_req_fn *elevator_deactivate_req_fn;
+ elevator_kick_page_fn *elevator_kick_page_fn;

elevator_queue_empty_fn *elevator_queue_empty_fn;
elevator_completed_req_fn *elevator_completed_req_fn;
@@ -91,6 +93,7 @@ extern void elv_dispatch_sort(request_qu
extern void elv_add_request(request_queue_t *, struct request *, int, int);
extern void __elv_add_request(request_queue_t *, struct request *, int, int);
extern void elv_insert(request_queue_t *, struct request *, int);
+extern void elv_kick_page(request_queue_t *, struct page *);
extern int elv_merge(request_queue_t *, struct request **, struct bio *);
extern void elv_merge_requests(request_queue_t *, struct request *,
struct request *);
--- linux-2.6.17-rc5-mm3.orig/block/elevator.c
+++ linux-2.6.17-rc5-mm3/block/elevator.c
@@ -468,6 +468,16 @@ void elv_add_request(request_queue_t *q,
spin_unlock_irqrestore(q->queue_lock, flags);
}

+void elv_kick_page(request_queue_t *q, struct page *page)
+{
+ if (page && q->elevator && q->elevator->ops->elevator_kick_page_fn) {
+ spin_lock_irq(q->queue_lock);
+ q->elevator->ops->elevator_kick_page_fn(q, page);
+ spin_unlock_irq(q->queue_lock);
+ }
+
+}
+
static inline struct request *__elv_next_request(request_queue_t *q)
{
struct request *rq;
--
-
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