From c8ce161852d2bc96b27d458cbe63ad9c20f6f7de Mon Sep 17 00:00:00 2001 From: Changpeng Liu Date: Fri, 18 Nov 2016 11:23:22 +0800 Subject: [PATCH] bdev/nvme: set bdev write cache flag according to NVMe capability Change-Id: Iad307b0d1883d00b2e68bbdfaa94f05955a8314d Signed-off-by: Changpeng Liu --- lib/bdev/nvme/blockdev_nvme.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/lib/bdev/nvme/blockdev_nvme.c b/lib/bdev/nvme/blockdev_nvme.c index db57704d4..b348fbd49 100644 --- a/lib/bdev/nvme/blockdev_nvme.c +++ b/lib/bdev/nvme/blockdev_nvme.c @@ -594,7 +594,12 @@ nvme_ctrlr_initialize_blockdevs(struct spdk_nvme_ctrlr *ctrlr, int bdev_per_ns, bdev->disk.max_unmap_bdesc_count = NVME_DEFAULT_MAX_UNMAP_BDESC_COUNT; } - bdev->disk.write_cache = 1; + + bdev->disk.write_cache = 0; + if (cdata->vwc.present) { + /* Enable if the Volatile Write Cache exists */ + bdev->disk.write_cache = 1; + } bdev->blocklen = spdk_nvme_ns_get_sector_size(ns); bdev->disk.blocklen = bdev->blocklen; bdev->disk.blockcnt = bdev->lba_end - bdev->lba_start + 1;