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authorLars Ellenberg <lars.ellenberg@linbit.com>2013-03-19 18:16:54 +0100
committerJens Axboe <axboe@kernel.dk>2013-03-22 18:15:17 -0600
commit779b3fe4c0e9dea19ae3ddef0b5fd1a663b63ee6 (patch)
treec750af98a46675531e7a40c6d1e1061382dc2b1a /drivers/block/drbd/drbd_req.c
parent6c3c4355d6bfa418db828684e67910c559402264 (diff)
downloadvexpress-lsk-779b3fe4c0e9dea19ae3ddef0b5fd1a663b63ee6.tar.gz
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>
Diffstat (limited to 'drivers/block/drbd/drbd_req.c')
-rw-r--r--drivers/block/drbd/drbd_req.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 4af709e0aae..43bc1d064bc 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1020,6 +1020,14 @@ drbd_submit_req_private_bio(struct drbd_request *req)
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
* drbd_send_and_submit() it (to save latency), or NULL if we queued the
* 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;
}
- /* 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
&& !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;
- drbd_al_begin_io(mdev, &req->i, true);
}
return req;