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drbd: queue writes on submitter thread, unless they pass the activity log fastpath 

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Lars Ellenberg 2013-03-19 18:16:54 +01:00 committed by Jens Axboe
parent 6c3c4355d6
commit 779b3fe4c0
1 changed files with 12 additions and 8 deletions
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20
drivers/block/drbd/drbd_req.c
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@ -1020,6 +1020,14 @@ drbd_submit_req_private_bio(struct drbd_request *req)
bio_endio(bio, -EIO); bio_endio(bio, -EIO);
} }
static void drbd_queue_write(struct drbd_conf *mdev, struct drbd_request *req)
{
spin_lock(&mdev->submit.lock);
list_add_tail(&req->tl_requests, &mdev->submit.writes);
spin_unlock(&mdev->submit.lock);
queue_work(mdev->submit.wq, &mdev->submit.worker);
}
/* returns the new drbd_request pointer, if the caller is expected to /* returns the new drbd_request pointer, if the caller is expected to
* drbd_send_and_submit() it (to save latency), or NULL if we queued the * drbd_send_and_submit() it (to save latency), or NULL if we queued the
* request on the submitter thread. * request on the submitter thread.
@ -1048,17 +1056,13 @@ drbd_request_prepare(struct drbd_conf *mdev, struct bio *bio, unsigned long star
req->private_bio = NULL; req->private_bio = NULL;
} }
/* For WRITES going to the local disk, grab a reference on the target
* extent. This waits for any resync activity in the corresponding
* resync extent to finish, and, if necessary, pulls in the target
* extent into the activity log, which involves further disk io because
* of transactional on-disk meta data updates.
* Empty flushes don't need to go into the activity log, they can only
* flush data for pending writes which are already in there. */
if (rw == WRITE && req->private_bio && req->i.size if (rw == WRITE && req->private_bio && req->i.size
&& !test_bit(AL_SUSPENDED, &mdev->flags)) { && !test_bit(AL_SUSPENDED, &mdev->flags)) {
if (!drbd_al_begin_io_fastpath(mdev, &req->i)) {
drbd_queue_write(mdev, req);
return NULL;
}
req->rq_state |= RQ_IN_ACT_LOG; req->rq_state |= RQ_IN_ACT_LOG;
drbd_al_begin_io(mdev, &req->i, true);
} }
return req; return req;