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drbd: explicitly submit meta data requests with REQ_NOIDLE

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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>
This commit is contained in:
Lars Ellenberg 2014-02-11 08:56:53 +01:00 committed by Philipp Reisner
parent 720979fb90
commit 2ed912e9d3
1 changed files with 1 additions and 1 deletions
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2
drivers/block/drbd/drbd_actlog.c
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@ -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)) if ((rw & WRITE) && !test_bit(MD_NO_FUA, &device->flags))
rw |= REQ_FUA | REQ_FLUSH; rw |= REQ_FUA | REQ_FLUSH;
rw |= REQ_SYNC; rw |= REQ_SYNC | REQ_NOIDLE;
bio = bio_alloc_drbd(GFP_NOIO); bio = bio_alloc_drbd(GFP_NOIO);
bio->bi_bdev = bdev->md_bdev; bio->bi_bdev = bdev->md_bdev;