lkml.org 
[lkml]   [2019]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] scsi: associate bio write hint with WRITE CDB
Date
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.

Change-Id: I565c8e0c1d10e17a23e73f2a02c1adbd198b04b3
Signed-off-by: Randall Huang <huangrandall@google.com>
---
drivers/scsi/sd.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 4b49cb67617e..db48a849107e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1201,7 +1201,11 @@ 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 +1215,13 @@ 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
\
 
 \ /
  Last update: 2019-01-03 10:56    [W:0.034 / U:14.164 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site