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blk-mq-sched: refactor scheduler initialization

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Preparation cleanup for the next couple of fixes, push
blk_mq_sched_setup() and e->ops.mq.init_sched() into a helper.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval
2017-04-05 12:01:30 -07:00
committed by Jens Axboe
parent 81380ca107
commit 6917ff0b5b
3 changed files with 59 additions and 61 deletions
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block/elevator.c
+12 -20
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@@ -242,17 +242,12 @@ int elevator_init(struct request_queue *q, char *name)
}
}
if (e->uses_mq) {
err = blk_mq_sched_setup(q);
if (!err)
err = e->ops.mq.init_sched(q, e);
} else
if (e->uses_mq)
err = blk_mq_init_sched(q, e);
else
err = e->ops.sq.elevator_init_fn(q, e);
if (err) {
if (e->uses_mq)
blk_mq_sched_teardown(q);
if (err)
elevator_put(e);
}
return err;
}
EXPORT_SYMBOL(elevator_init);
@@ -987,21 +982,18 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
}
/* allocate, init and register new elevator */
if (new_e) {
if (new_e->uses_mq) {
err = blk_mq_sched_setup(q);
if (!err)
err = new_e->ops.mq.init_sched(q, new_e);
} else
err = new_e->ops.sq.elevator_init_fn(q, new_e);
if (err)
goto fail_init;
if (q->mq_ops)
err = blk_mq_init_sched(q, new_e);
else
err = new_e->ops.sq.elevator_init_fn(q, new_e);
if (err)
goto fail_init;
if (new_e) {
err = elv_register_queue(q);
if (err)
goto fail_register;
} else
q->elevator = NULL;
}
/* done, kill the old one and finish */
if (old) {