[Drbd-dev] [PATCH 12/23] sd: handle REQ_UNMAP

[Christoph Hellwig]

Try to use a write same with unmap bit variant if the device supports it
and the caller asks for it.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/scsi/sd.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index b6f70a09a301..ca96bb33471b 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -871,6 +871,16 @@ static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 			return BLKPREP_INVALID;
 		return sd_setup_ata_trim_cmnd(cmd);
 	}
+
+	if (rq->cmd_flags & REQ_UNMAP) {
+		switch (sdkp->provisioning_mode) {
+		case SD_LBP_WS16:
+			return sd_setup_write_same16_cmnd(cmd, true);
+		case SD_LBP_WS10:
+			return sd_setup_write_same10_cmnd(cmd, true);
+		}
+	}
+
 	if (sdp->no_write_same)
 		return BLKPREP_INVALID;
 	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
-- 
2.11.0