NVMe: Disk IO statistics

Add io stats accounting for bio requests so nvme block devices show
useful disk stats.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index f451c8d6e231..5d7c07946fbe 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -572,6 +572,7 @@ struct nvme_iod {
         int offset;             /* Of PRP list */
         int nents;              /* Used in scatterlist */
         int length;             /* Of data, in bytes */
+        unsigned long start_time;
         dma_addr_t first_dma;
         struct scatterlist sg[0];
 };