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

[Jens Axboe]

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 <ax...@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