The patch titled
block: add elv_extended_request call to iosched API
has been added to the -mm tree. Its filename is
add-elv_extended_request-call-to-iosched-api.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: block: add elv_extended_request call to iosched API
From: "Nate Diller" <nate.diller@xxxxxxxxx>
the Elevator iosched would prefer to be unconditionally notified of a merge,
but the current API calls only one 'merge' notifier (elv_merge_requests or
elv_merged_requests), even if both front and back merges happened.
elv_extended_request satisfies this requirement in conjunction with
elv_merge_requests.
Signed-off-by: Nate Diller <nate.diller@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
block/elevator.c | 9 +++++++++
block/ll_rw_blk.c | 2 ++
include/linux/elevator.h | 4 ++++
3 files changed, 15 insertions(+)
diff -puN block/elevator.c~add-elv_extended_request-call-to-iosched-api block/elevator.c
--- a/block/elevator.c~add-elv_extended_request-call-to-iosched-api
+++ a/block/elevator.c
@@ -466,6 +466,15 @@ void elv_merged_request(request_queue_t
q->last_merge = rq;
}
+void elv_extended_request(request_queue_t *q, struct request *rq,
+ int direction, int nr_sectors)
+{
+ elevator_t *e = q->elevator;
+
+ if (e->ops->elevator_extended_req_fn)
+ e->ops->elevator_extended_req_fn(q, rq, direction, nr_sectors);
+}
+
void elv_merge_requests(request_queue_t *q, struct request *rq,
struct request *next)
{
diff -puN block/ll_rw_blk.c~add-elv_extended_request-call-to-iosched-api block/ll_rw_blk.c
--- a/block/ll_rw_blk.c~add-elv_extended_request-call-to-iosched-api
+++ a/block/ll_rw_blk.c
@@ -2864,6 +2864,7 @@ static int __make_request(request_queue_
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
drive_stat_acct(req, nr_sectors, 0);
+ elv_extended_request(q, req, el_ret, nr_sectors);
if (!attempt_back_merge(q, req))
elv_merged_request(q, req, el_ret);
goto out;
@@ -2891,6 +2892,7 @@ static int __make_request(request_queue_
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
drive_stat_acct(req, nr_sectors, 0);
+ elv_extended_request(q, req, el_ret, nr_sectors);
if (!attempt_front_merge(q, req))
elv_merged_request(q, req, el_ret);
goto out;
diff -puN include/linux/elevator.h~add-elv_extended_request-call-to-iosched-api include/linux/elevator.h
--- a/include/linux/elevator.h~add-elv_extended_request-call-to-iosched-api
+++ a/include/linux/elevator.h
@@ -8,6 +8,8 @@ typedef int (elevator_merge_fn) (request
typedef void (elevator_merge_req_fn) (request_queue_t *, struct request *, struct request *);
+typedef void (elevator_extended_req_fn) (request_queue_t *, struct request *, int, int);
+
typedef void (elevator_merged_fn) (request_queue_t *, struct request *, int);
typedef int (elevator_dispatch_fn) (request_queue_t *, int);
@@ -30,6 +32,7 @@ struct elevator_ops
{
elevator_merge_fn *elevator_merge_fn;
elevator_merged_fn *elevator_merged_fn;
+ elevator_extended_req_fn *elevator_extended_req_fn;
elevator_merge_req_fn *elevator_merge_req_fn;
elevator_dispatch_fn *elevator_dispatch_fn;
@@ -98,6 +101,7 @@ extern void elv_insert(request_queue_t *
extern int elv_merge(request_queue_t *, struct request **, struct bio *);
extern void elv_merge_requests(request_queue_t *, struct request *,
struct request *);
+extern void elv_extended_request(request_queue_t *, struct request *, int, int);
extern void elv_merged_request(request_queue_t *, struct request *, int);
extern void elv_dequeue_request(request_queue_t *, struct request *);
extern void elv_requeue_request(request_queue_t *, struct request *);
_
Patches currently in -mm which might be from nate.diller@xxxxxxxxx are
add-elv_extended_request-call-to-iosched-api.patch
add-list_merge-to-listh.patch
add-the-elevator-i-o-scheduler.patch
-
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