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[5/6] NVMe: inform block layer of write cache state

Message ID 1458669320-6819-6-git-send-email-axboe@fb.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jens Axboe March 22, 2016, 5:55 p.m. UTC 
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(+)
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Patch

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);
 }
 
 /*