drbd: explicitly submit meta data requests with REQ_NOIDLE

For some reason we have assumed NOIDLE was implied
by one of the other flags we set. It is not (anymore?).
Explicitly set REQ_NOIDLE for synchronous meta data updates,
or we can seriously starve random writes when using CFQ.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 278c31f..14b2f27 100644 (file)
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -150,7 +150,7 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 
        if ((rw & WRITE) && !test_bit(MD_NO_FUA, &device->flags))
                rw |= REQ_FUA | REQ_FLUSH;
-       rw |= REQ_SYNC;
+       rw |= REQ_SYNC | REQ_NOIDLE;
 
        bio = bio_alloc_drbd(GFP_NOIO);
        bio->bi_bdev = bdev->md_bdev;