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md: move io accounting out of personalities into md_make_request

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While I generally prefer letting personalities do as much as possible,
given that we have a central md_make_request anyway we may as well use
it to simplify code.
Also this centralises knowledge of ->gendisk which will help later.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
2010-03-25 16:20:56 +11:00
parent 2b7f22284d
commit 490773268c
7 changed files with 12 additions and 45 deletions
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11
drivers/md/md.c
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@@ -214,8 +214,11 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
*/
static int md_make_request(struct request_queue *q, struct bio *bio)
{
const int rw = bio_data_dir(bio);
mddev_t *mddev = q->queuedata;
int rv;
int cpu;
if (mddev == NULL || mddev->pers == NULL) {
bio_io_error(bio);
return 0;
@@ -236,7 +239,15 @@ static int md_make_request(struct request_queue *q, struct bio *bio)
}
atomic_inc(&mddev->active_io);
rcu_read_unlock();
rv = mddev->pers->make_request(q, bio);
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
wake_up(&mddev->sb_wait);