linux-kernel - [PATCH] scsi: associate bio write hint with WRITE CDB

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Message-Id: <20181226055111.101325-1-huangrandall@google.com>
Date:   Wed, 26 Dec 2018 13:51:11 +0800
From:   Randall Huang <ihhuang@...ail.org>
To:     jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     huangrandall@...gle.com
Subject: [PATCH] scsi: associate bio write hint with WRITE CDB

In SPC-3, WRITE(10)/(16) support grouping function.
Let's associate bio write hint with group number for
enabling StreamID or Turbo Write feature.

Signed-off-by: Randall Huang <huangrandall@...gle.com>
---
 drivers/scsi/sd.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 4b49cb67617e..28bfa9ed2b54 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1201,7 +1201,12 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 		SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
 		SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
 		SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
-		SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
+		if (rq_data_dir(rq) == WRITE) {
+			SCpnt->cmnd[14] = rq->bio->bi_write_hint & 0x3f;
+		} else {
+			SCpnt->cmnd[14] = 0;
+		}
+		SCpnt->cmnd[15] = 0;
 	} else if ((this_count > 0xff) || (block > 0x1fffff) ||
 		   scsi_device_protection(SCpnt->device) ||
 		   SCpnt->device->use_10_for_rw) {
@@ -1211,9 +1216,14 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 		SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
 		SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
 		SCpnt->cmnd[5] = (unsigned char) block & 0xff;
-		SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
+		if (rq_data_dir(rq) == WRITE) {
+			SCpnt->cmnd[6] = rq->bio->bi_write_hint & 0x1f;
+		} else {
+			SCpnt->cmnd[6] = 0;
+		}
 		SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
 		SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
+		SCpnt->cmnd[9] = 0;
 	} else {
 		if (unlikely(rq->cmd_flags & REQ_FUA)) {
 			/*
-- 
2.20.1.415.g653613c723-goog