From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Tue, 11 Feb 2014 07:56:53 +0000 (+0100)
Subject: drbd: explicitly submit meta data requests with REQ_NOIDLE
X-Git-Tag: v3.17-rc1~31^2~48
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2ed912e9d35b4d7d766a530f5dd14513a3ab9f64;p=karo-tx-linux.git

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 278c31f24639..14b2f27291aa 100644
--- 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;