linux-kernel - [PATCH 4/6] sd: inform block layer of write cache state

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Message-ID: <1458669320-6819-5-git-send-email-axboe@fb.com>
Date:	Tue, 22 Mar 2016 11:55:18 -0600
From:	Jens Axboe <axboe@...com>
To:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-block@...r.kernel.org>
CC:	Jens Axboe <axboe@...com>
Subject: [PATCH 4/6] sd: inform block layer of write cache state

Signed-off-by: Jens Axboe <axboe@...com>
---
 drivers/scsi/sd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5a5457ac9cdb..049f424fb4ad 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -192,6 +192,7 @@ cache_type_store(struct device *dev, struct device_attribute *attr,
 		sdkp->WCE = wce;
 		sdkp->RCD = rcd;
 		sd_set_flush_flag(sdkp);
+		blk_queue_write_cache(sdp->request_queue, wce != 0);
 		return count;
 	}
 
@@ -2571,7 +2572,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
 				  sdkp->DPOFUA ? "supports DPO and FUA"
 				  : "doesn't support DPO or FUA");
 
-		return;
+		goto done;
 	}
 
 bad_sense:
@@ -2596,6 +2597,8 @@ defaults:
 	}
 	sdkp->RCD = 0;
 	sdkp->DPOFUA = 0;
+done:
+	blk_queue_write_cache(sdp->request_queue, sdkp->WCE != 0);
 }
 
 /*
-- 
2.4.1.168.g1ea28e1