From: Sagi Grimberg <sagi@grimberg.me>
Date: Wed, 21 Sep 2016 18:06:32 +0000 (-0700)
Subject: nvmet: Use direct IO for writes
X-Git-Tag: v4.9-rc1~87^2~4
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9b349b080ca9777f6dab3da06d7fa4577f7d4c29;p=users%2Fhch%2Fmisc.git

nvmet: Use direct IO for writes

We're designed to work with high-end devices where
direct IO makes perfect sense. We noticed that we
context switch by scheduling kblockd instead of going
directly to the device without REQ_SYNC for writes.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/nvme/target/io-cmd.c b/drivers/nvme/target/io-cmd.c
index 2cd069b691ae..4132b6b98182 100644
--- a/drivers/nvme/target/io-cmd.c
+++ b/drivers/nvme/target/io-cmd.c
@@ -58,6 +58,7 @@ static void nvmet_execute_rw(struct nvmet_req *req)
 
 	if (req->cmd->rw.opcode == nvme_cmd_write) {
 		op = REQ_OP_WRITE;
+		op_flags = WRITE_ODIRECT;
 		if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
 			op_flags |= REQ_FUA;
 	} else {