[PATCH 7/9] NVMe: inform block layer of write cache state

From	Jens Axboe <axboe@fb.com>
Newsgroups	linux.kernel
Subject	[PATCH 7/9] NVMe: inform block layer of write cache state
Date	2016-03-30 17:10 +0200
Message-ID	<ripUS-7fj-23@gated-at.bofh.it> (permalink)
References	<ripUS-7fj-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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This isn't quite correct, since the VWC merely states if a potential
write back cache is volatile or not. But for the purpose of write
absortion, it's good enough.

Signed-off-by: Jens Axboe <axboe@fb.com>
---
 drivers/nvme/host/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 643f457131c2..05c8edfb7611 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -906,6 +906,7 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
 		blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
 	blk_queue_virt_boundary(q, ctrl->page_size - 1);
+	blk_queue_write_cache(q, ctrl->vwc & NVME_CTRL_VWC_PRESENT);
 }
 
 /*
-- 
2.8.0.rc4.6.g7e4ba36

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[PATCH 7/9] NVMe: inform block layer of write cache state Jens Axboe <axboe@fb.com> - 2016-03-30 17:10 +0200

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