[RFC PATCH -next v3 05/10] scsi: sd: set BLK_FEAT_WRITE_ZEROES_UNMAP if device supports unmap zeroing mode

[Zhang Yi]

From: Zhang Yi <yi.zhang at huawei.com>

When the device supports the Write Zeroes command and the zeroing mode
is set to SD_ZERO_WS16_UNMAP or SD_ZERO_WS10_UNMAP, this means that the
device supports unmap Write Zeroes, so set the corresponding
BLK_FEAT_WRITE_ZEROES_UNMAP feature to the device's queue limit.

Signed-off-by: Zhang Yi <yi.zhang at huawei.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
---
 drivers/scsi/sd.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 950d8c9fb884..652630b410de 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1118,6 +1118,11 @@ static void sd_config_write_same(struct scsi_disk *sdkp,
 	else
 		sdkp->zeroing_mode = SD_ZERO_WRITE;
 
+	if (sdkp->max_ws_blocks &&
+	    (sdkp->zeroing_mode == SD_ZERO_WS16_UNMAP ||
+	     sdkp->zeroing_mode == SD_ZERO_WS10_UNMAP))
+		lim->features |= BLK_FEAT_WRITE_ZEROES_UNMAP;
+
 	if (sdkp->max_ws_blocks &&
 	    sdkp->physical_block_size > logical_block_size) {
 		/*
-- 
2.46.1